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Merge branches 'no-rebases', 'arch-avr32', 'arch-blackfin', 'arch-cris', 'arch-h8300', 'arch-m32r', 'arch-mn10300', 'arch-score', 'arch-sh' and 'arch-powerpc' into for-next

This commit is contained in:
Al Viro 2012-11-28 21:52:07 -05:00
parent d2125043ae a2b6dfaef0 5fd0b580a9 999121a10c 1703a219f7 71915d21e5 8eae10e86c ddf23e87a8 1ffbed7220 80b249b71e ab75819d39
commit f4091322d7
165 changed files with 993 additions and 2792 deletions
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2
arch/arm64/Kconfig
View File

@ -7,6 +7,8 @@ config ARM64
select GENERIC_IOMAP
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
select GENERIC_KERNEL_EXECVE
select GENERIC_KERNEL_THREAD
select GENERIC_SMP_IDLE_THREAD
select GENERIC_TIME_VSYSCALL
select HARDIRQS_SW_RESEND

5
arch/arm64/include/asm/processor.h
View File

@ -128,11 +128,6 @@ unsigned long get_wchan(struct task_struct *p);
extern struct task_struct *cpu_switch_to(struct task_struct *prev,
struct task_struct *next);
/*
* Create a new kernel thread
*/
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
#define task_pt_regs(p) \
((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)

14
arch/arm64/include/asm/syscalls.h
View File

@ -23,18 +23,16 @@
/*
* System call wrappers implemented in kernel/entry.S.
*/
asmlinkage long sys_execve_wrapper(const char __user *filename,
const char __user *const __user *argv,
const char __user *const __user *envp);
asmlinkage long sys_clone_wrapper(unsigned long clone_flags,
unsigned long newsp,
void __user *parent_tid,
unsigned long tls_val,
void __user *child_tid);
asmlinkage long sys_rt_sigreturn_wrapper(void);
asmlinkage long sys_sigaltstack_wrapper(const stack_t __user *uss,
stack_t __user *uoss);
/*
* AArch64 sys_clone implementation has a different prototype than the generic
* one (additional TLS value argument).
*/
#define sys_clone sys_clone
#include <asm-generic/syscalls.h>
#endif /* __ASM_SYSCALLS_H */

1
arch/arm64/include/asm/unistd.h
View File

@ -25,4 +25,5 @@
#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_COMPAT_SYS_SENDFILE
#endif
#define __ARCH_WANT_SYS_EXECVE
#include <uapi/asm/unistd.h>

8
arch/arm64/include/asm/unistd32.h
View File

@ -23,7 +23,7 @@
__SYSCALL(0, sys_restart_syscall)
__SYSCALL(1, sys_exit)
__SYSCALL(2, compat_sys_fork_wrapper)
__SYSCALL(2, compat_sys_fork)
__SYSCALL(3, sys_read)
__SYSCALL(4, sys_write)
__SYSCALL(5, compat_sys_open)
@ -32,7 +32,7 @@ __SYSCALL(7, sys_ni_syscall) /* 7 was sys_waitpid */
__SYSCALL(8, sys_creat)
__SYSCALL(9, sys_link)
__SYSCALL(10, sys_unlink)
__SYSCALL(11, compat_sys_execve_wrapper)
__SYSCALL(11, compat_sys_execve)
__SYSCALL(12, sys_chdir)
__SYSCALL(13, sys_ni_syscall) /* 13 was sys_time */
__SYSCALL(14, sys_mknod)
@ -141,7 +141,7 @@ __SYSCALL(116, compat_sys_sysinfo)
__SYSCALL(117, sys_ni_syscall) /* 117 was sys_ipc */
__SYSCALL(118, sys_fsync)
__SYSCALL(119, compat_sys_sigreturn_wrapper)
__SYSCALL(120, compat_sys_clone_wrapper)
__SYSCALL(120, sys_clone)
__SYSCALL(121, sys_setdomainname)
__SYSCALL(122, sys_newuname)
__SYSCALL(123, sys_ni_syscall) /* 123 was sys_modify_ldt */
@ -211,7 +211,7 @@ __SYSCALL(186, compat_sys_sigaltstack_wrapper)
__SYSCALL(187, compat_sys_sendfile)
__SYSCALL(188, sys_ni_syscall) /* 188 reserved */
__SYSCALL(189, sys_ni_syscall) /* 189 reserved */
__SYSCALL(190, compat_sys_vfork_wrapper)
__SYSCALL(190, compat_sys_vfork)
__SYSCALL(191, compat_sys_getrlimit) /* SuS compliant getrlimit */
__SYSCALL(192, sys_mmap_pgoff)
__SYSCALL(193, compat_sys_truncate64_wrapper)

17
arch/arm64/kernel/entry.S
View File

@ -594,7 +594,7 @@ work_resched:
/*
* "slow" syscall return path.
*/
ENTRY(ret_to_user)
ret_to_user:
disable_irq // disable interrupts
ldr x1, [tsk, #TI_FLAGS]
and x2, x1, #_TIF_WORK_MASK
@ -611,7 +611,10 @@ ENDPROC(ret_to_user)
*/
ENTRY(ret_from_fork)
bl schedule_tail
get_thread_info tsk
cbz x19, 1f // not a kernel thread
mov x0, x20
blr x19
1: get_thread_info tsk
b ret_to_user
ENDPROC(ret_from_fork)
@ -673,16 +676,6 @@ __sys_trace_return:
/*
* Special system call wrappers.
*/
ENTRY(sys_execve_wrapper)
mov x3, sp
b sys_execve
ENDPROC(sys_execve_wrapper)
ENTRY(sys_clone_wrapper)
mov x5, sp
b sys_clone
ENDPROC(sys_clone_wrapper)
ENTRY(sys_rt_sigreturn_wrapper)
mov x0, sp
b sys_rt_sigreturn

89
arch/arm64/kernel/process.c
View File

@ -240,27 +240,41 @@ int copy_thread(unsigned long clone_flags, unsigned long stack_start,
struct pt_regs *childregs = task_pt_regs(p);
unsigned long tls = p->thread.tp_value;
*childregs = *regs;
childregs->regs[0] = 0;
if (is_compat_thread(task_thread_info(p)))
childregs->compat_sp = stack_start;
else {
/*
* Read the current TLS pointer from tpidr_el0 as it may be
* out-of-sync with the saved value.
*/
asm("mrs %0, tpidr_el0" : "=r" (tls));
childregs->sp = stack_start;
}
memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));
p->thread.cpu_context.sp = (unsigned long)childregs;
p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
/* If a TLS pointer was passed to clone, use that for the new thread. */
if (clone_flags & CLONE_SETTLS)
tls = regs->regs[3];
if (likely(regs)) {
*childregs = *regs;
childregs->regs[0] = 0;
if (is_compat_thread(task_thread_info(p))) {
if (stack_start)
childregs->compat_sp = stack_start;
} else {
/*
* Read the current TLS pointer from tpidr_el0 as it may be
* out-of-sync with the saved value.
*/
asm("mrs %0, tpidr_el0" : "=r" (tls));
if (stack_start) {
/* 16-byte aligned stack mandatory on AArch64 */
if (stack_start & 15)
return -EINVAL;
childregs->sp = stack_start;
}
}
/*
* If a TLS pointer was passed to clone (4th argument), use it
* for the new thread.
*/
if (clone_flags & CLONE_SETTLS)
tls = regs->regs[3];
} else {
memset(childregs, 0, sizeof(struct pt_regs));
childregs->pstate = PSR_MODE_EL1h;
p->thread.cpu_context.x19 = stack_start;
p->thread.cpu_context.x20 = stk_sz;
}
p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
p->thread.cpu_context.sp = (unsigned long)childregs;
p->thread.tp_value = tls;
ptrace_hw_copy_thread(p);
@ -309,43 +323,6 @@ struct task_struct *__switch_to(struct task_struct *prev,
return last;
}
/*
* Shuffle the argument into the correct register before calling the
* thread function. x1 is the thread argument, x2 is the pointer to
* the thread function, and x3 points to the exit function.
*/
extern void kernel_thread_helper(void);
asm( ".section .text\n"
" .align\n"
" .type kernel_thread_helper, #function\n"
"kernel_thread_helper:\n"
" mov x0, x1\n"
" mov x30, x3\n"
" br x2\n"
" .size kernel_thread_helper, . - kernel_thread_helper\n"
" .previous");
#define kernel_thread_exit do_exit
/*
* Create a kernel thread.
*/
pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.regs[1] = (unsigned long)arg;
regs.regs[2] = (unsigned long)fn;
regs.regs[3] = (unsigned long)kernel_thread_exit;
regs.pc = (unsigned long)kernel_thread_helper;
regs.pstate = PSR_MODE_EL1h;
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);
unsigned long get_wchan(struct task_struct *p)
{
struct stackframe frame;

76
arch/arm64/kernel/sys.c
View File

@ -31,80 +31,12 @@
*/
asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp,
int __user *parent_tidptr, unsigned long tls_val,
int __user *child_tidptr, struct pt_regs *regs)
int __user *child_tidptr)
{
if (!newsp)
newsp = regs->sp;
/* 16-byte aligned stack mandatory on AArch64 */
if (newsp & 15)
return -EINVAL;
return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
return do_fork(clone_flags, newsp, current_pt_regs(), 0,
parent_tidptr, child_tidptr);
}
/*
* sys_execve() executes a new program.
*/
asmlinkage long sys_execve(const char __user *filenamei,
const char __user *const __user *argv,
const char __user *const __user *envp,
struct pt_regs *regs)
{
long error;
struct filename *filename;
filename = getname(filenamei);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
out:
return error;
}
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
struct pt_regs regs;
int ret;
memset(&regs, 0, sizeof(struct pt_regs));
ret = do_execve(filename,
(const char __user *const __user *)argv,
(const char __user *const __user *)envp, &regs);
if (ret < 0)
goto out;
/*
* Save argc to the register structure for userspace.
*/
regs.regs[0] = ret;
/*
* We were successful. We won't be returning to our caller, but
* instead to user space by manipulating the kernel stack.
*/
asm( "add x0, %0, %1\n\t"
"mov x1, %2\n\t"
"mov x2, %3\n\t"
"bl memmove\n\t" /* copy regs to top of stack */
"mov x27, #0\n\t" /* not a syscall */
"mov x28, %0\n\t" /* thread structure */
"mov sp, x0\n\t" /* reposition stack pointer */
"b ret_to_user"
:
: "r" (current_thread_info()),
"Ir" (THREAD_START_SP - sizeof(regs)),
"r" (&regs),
"Ir" (sizeof(regs))
: "x0", "x1", "x2", "x27", "x28", "x30", "memory");
out:
return ret;
}
EXPORT_SYMBOL(kernel_execve);
asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, off_t off)
@ -118,8 +50,6 @@ asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
/*
* Wrappers to pass the pt_regs argument.
*/
#define sys_execve sys_execve_wrapper
#define sys_clone sys_clone_wrapper
#define sys_rt_sigreturn sys_rt_sigreturn_wrapper
#define sys_sigaltstack sys_sigaltstack_wrapper

19
arch/arm64/kernel/sys32.S
View File

@ -26,25 +26,6 @@
/*
* System call wrappers for the AArch32 compatibility layer.
*/
compat_sys_fork_wrapper:
mov x0, sp
b compat_sys_fork
ENDPROC(compat_sys_fork_wrapper)
compat_sys_vfork_wrapper:
mov x0, sp
b compat_sys_vfork
ENDPROC(compat_sys_vfork_wrapper)
compat_sys_execve_wrapper:
mov x3, sp
b compat_sys_execve
ENDPROC(compat_sys_execve_wrapper)
compat_sys_clone_wrapper:
mov x5, sp
b compat_sys_clone
ENDPROC(compat_sys_clone_wrapper)
compat_sys_sigreturn_wrapper:
mov x0, sp

38
arch/arm64/kernel/sys_compat.c
View File

@ -28,43 +28,15 @@
#include <asm/cacheflush.h>
#include <asm/unistd32.h>
asmlinkage int compat_sys_fork(struct pt_regs *regs)
asmlinkage int compat_sys_fork(void)
{
return do_fork(SIGCHLD, regs->compat_sp, regs, 0, NULL, NULL);
return do_fork(SIGCHLD, 0, current_pt_regs(), 0, NULL, NULL);
}
asmlinkage int compat_sys_clone(unsigned long clone_flags, unsigned long newsp,
int __user *parent_tidptr, int tls_val,
int __user *child_tidptr, struct pt_regs *regs)
asmlinkage int compat_sys_vfork(void)
{
if (!newsp)
newsp = regs->compat_sp;
return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
}
asmlinkage int compat_sys_vfork(struct pt_regs *regs)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->compat_sp,
regs, 0, NULL, NULL);
}
asmlinkage int compat_sys_execve(const char __user *filenamei,
compat_uptr_t argv, compat_uptr_t envp,
struct pt_regs *regs)
{
int error;
struct filename *filename;
filename = getname(filenamei);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = compat_do_execve(filename->name, compat_ptr(argv),
compat_ptr(envp), regs);
putname(filename);
out:
return error;
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0,
current_pt_regs(), 0, NULL, NULL);
}
asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid,

2
arch/avr32/Kconfig
View File

@ -17,6 +17,8 @@ config AVR32
select GENERIC_CLOCKEVENTS
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
help
AVR32 is a high-performance 32-bit RISC microprocessor core,
designed for cost-sensitive embedded applications, with particular

3
arch/avr32/include/asm/processor.h
View File

@ -142,9 +142,6 @@ struct task_struct;
/* Free all resources held by a thread */
extern void release_thread(struct task_struct *);
/* Create a kernel thread without removing it from tasklists */
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
/* Return saved PC of a blocked thread */
#define thread_saved_pc(tsk) ((tsk)->thread.cpu_context.pc)

1
arch/avr32/include/asm/unistd.h
View File

@ -39,6 +39,7 @@
#define __ARCH_WANT_SYS_GETPGRP
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
/*
* "Conditional" syscalls

2
arch/avr32/kernel/Makefile
View File

@ -7,7 +7,7 @@ extra-y := head.o vmlinux.lds
obj-$(CONFIG_SUBARCH_AVR32B) += entry-avr32b.o
obj-y += syscall_table.o syscall-stubs.o irq.o
obj-y += setup.o traps.o ocd.o ptrace.o
obj-y += signal.o sys_avr32.o process.o time.o
obj-y += signal.o process.o time.o
obj-y += switch_to.o cpu.o
obj-$(CONFIG_MODULES) += module.o avr32_ksyms.o
obj-$(CONFIG_KPROBES) += kprobes.o

14
arch/avr32/kernel/entry-avr32b.S
View File

@ -251,13 +251,15 @@ syscall_badsys:
.global ret_from_fork
ret_from_fork:
call schedule_tail
mov r12, 0
rjmp syscall_return
/* check for syscall tracing */
get_thread_info r0
ld.w r1, r0[TI_flags]
andl r1, _TIF_ALLWORK_MASK, COH
brne syscall_exit_work
rjmp syscall_exit_cont
.global ret_from_kernel_thread
ret_from_kernel_thread:
call schedule_tail
mov r12, r0
mov lr, r2 /* syscall_return */
mov pc, r1
syscall_trace_enter:
pushm r8-r12

86
arch/avr32/kernel/process.c
View File

@ -68,44 +68,6 @@ void machine_restart(char *cmd)
while (1) ;
}
/*
* PC is actually discarded when returning from a system call -- the
* return address must be stored in LR. This function will make sure
* LR points to do_exit before starting the thread.
*
* Also, when returning from fork(), r12 is 0, so we must copy the
* argument as well.
*
* r0 : The argument to the main thread function
* r1 : The address of do_exit
* r2 : The address of the main thread function
*/
asmlinkage extern void kernel_thread_helper(void);
__asm__(" .type kernel_thread_helper, @function\n"
"kernel_thread_helper:\n"
" mov r12, r0\n"
" mov lr, r2\n"
" mov pc, r1\n"
" .size kernel_thread_helper, . - kernel_thread_helper");
int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.r0 = (unsigned long)arg;
regs.r1 = (unsigned long)fn;
regs.r2 = (unsigned long)do_exit;
regs.lr = (unsigned long)kernel_thread_helper;
regs.pc = (unsigned long)kernel_thread_helper;
regs.sr = MODE_SUPERVISOR;
return do_fork(flags | CLONE_VM | CLONE_UNTRACED,
0, &regs, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);
/*
* Free current thread data structures etc
*/
@ -332,26 +294,31 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
}
asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);
asmlinkage void syscall_return(void);
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long unused,
unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs;
struct pt_regs *childregs = task_pt_regs(p);
childregs = ((struct pt_regs *)(THREAD_SIZE + (unsigned long)task_stack_page(p))) - 1;
*childregs = *regs;
if (user_mode(regs))
if (unlikely(!regs)) {
memset(childregs, 0, sizeof(struct pt_regs));
p->thread.cpu_context.r0 = arg;
p->thread.cpu_context.r1 = usp; /* fn */
p->thread.cpu_context.r2 = syscall_return;
p->thread.cpu_context.pc = (unsigned long)ret_from_kernel_thread;
childregs->sr = MODE_SUPERVISOR;
} else {
*childregs = *regs;
childregs->sp = usp;
else
childregs->sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
childregs->r12 = 0; /* Set return value for child */
childregs->r12 = 0; /* Set return value for child */
p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
}
p->thread.cpu_context.sr = MODE_SUPERVISOR | SR_GM;
p->thread.cpu_context.ksp = (unsigned long)childregs;
p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
clear_tsk_thread_flag(p, TIF_DEBUG);
if ((clone_flags & CLONE_PTRACE) && test_thread_flag(TIF_DEBUG))
@ -382,27 +349,6 @@ asmlinkage int sys_vfork(struct pt_regs *regs)
0, NULL, NULL);
}
asmlinkage int sys_execve(const char __user *ufilename,
const char __user *const __user *uargv,
const char __user *const __user *uenvp,
struct pt_regs *regs)
{
int error;
struct filename *filename;
filename = getname(ufilename);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename->name, uargv, uenvp, regs);
putname(filename);
out:
return error;
}
/*
* This function is supposed to answer the question "who called
* schedule()?"

24
arch/avr32/kernel/sys_avr32.c
View File

@ -1,24 +0,0 @@
/*
* Copyright (C) 2004-2006 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/unistd.h>
int kernel_execve(const char *file,
const char *const *argv,
const char *const *envp)
{
register long scno asm("r8") = __NR_execve;
register long sc1 asm("r12") = (long)file;
register long sc2 asm("r11") = (long)argv;
register long sc3 asm("r10") = (long)envp;
asm volatile("scall"
: "=r"(sc1)
: "r"(scno), "0"(sc1), "r"(sc2), "r"(sc3)
: "cc", "memory");
return sc1;
}

6
arch/avr32/kernel/syscall-stubs.S
View File

@ -50,12 +50,6 @@ __sys_vfork:
mov r12, sp
rjmp sys_vfork
.global __sys_execve
.type __sys_execve,@function
__sys_execve:
mov r9, sp
rjmp sys_execve
.global __sys_mmap2
.type __sys_mmap2,@function
__sys_mmap2:

2
arch/avr32/kernel/syscall_table.S
View File

@ -24,7 +24,7 @@ sys_call_table:
.long sys_creat
.long sys_link
.long sys_unlink /* 10 */
.long __sys_execve
.long sys_execve
.long sys_chdir
.long sys_time
.long sys_mknod

2
arch/blackfin/Kconfig
View File

@ -45,6 +45,8 @@ config BLACKFIN
select ARCH_USES_GETTIMEOFFSET if !GENERIC_CLOCKEVENTS
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
config GENERIC_CSUM
def_bool y

2
arch/blackfin/include/asm/processor.h
View File

@ -75,8 +75,6 @@ static inline void release_thread(struct task_struct *dead_task)
{
}
extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
/*
* Free current thread data structures etc..
*/

1
arch/blackfin/include/asm/unistd.h
View File

@ -446,6 +446,7 @@
#define __ARCH_WANT_SYS_NICE
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
/*
* "Conditional" syscalls

22
arch/blackfin/kernel/entry.S
View File

@ -46,22 +46,16 @@ ENTRY(_ret_from_fork)
SP += -12;
pseudo_long_call _schedule_tail, p5;
SP += 12;
r0 = [sp + PT_IPEND];
cc = bittst(r0,1);
if cc jump .Lin_kernel;
p1 = [sp++];
r0 = [sp++];
cc = p1 == 0;
if cc jump .Lfork;
sp += -12;
call (p1);
sp += 12;
.Lfork:
RESTORE_CONTEXT
rti;
.Lin_kernel:
bitclr(r0,1);
[sp + PT_IPEND] = r0;
/* do a 'fake' RTI by jumping to [RETI]
* to avoid clearing supervisor mode in child
*/
r0 = [sp + PT_PC];
[sp + PT_P0] = r0;
RESTORE_ALL_SYS
jump (p0);
ENDPROC(_ret_from_fork)
ENTRY(_sys_vfork)

75
arch/blackfin/kernel/process.c
View File

@ -101,40 +101,6 @@ void cpu_idle(void)
}
}
/*
* This gets run with P1 containing the
* function to call, and R1 containing
* the "args". Note P0 is clobbered on the way here.
*/
void kernel_thread_helper(void);
__asm__(".section .text\n"
".align 4\n"
"_kernel_thread_helper:\n\t"
"\tsp += -12;\n\t"
"\tr0 = r1;\n\t" "\tcall (p1);\n\t" "\tcall _do_exit;\n" ".previous");
/*
* Create a kernel thread.
*/
pid_t kernel_thread(int (*fn) (void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.r1 = (unsigned long)arg;
regs.p1 = (unsigned long)fn;
regs.pc = (unsigned long)kernel_thread_helper;
regs.orig_p0 = -1;
/* Set bit 2 to tell ret_from_fork we should be returning to kernel
mode. */
regs.ipend = 0x8002;
__asm__ __volatile__("%0 = syscfg;":"=da"(regs.syscfg):);
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL,
NULL);
}
EXPORT_SYMBOL(kernel_thread);
/*
* Do necessary setup to start up a newly executed thread.
*
@ -193,38 +159,31 @@ copy_thread(unsigned long clone_flags,
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs;
unsigned long *v;
childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
*childregs = *regs;
childregs->r0 = 0;
v = ((unsigned long *)childregs) - 2;
if (unlikely(!regs)) {
memset(childregs, 0, sizeof(struct pt_regs));
v[0] = usp;
v[1] = topstk;
childregs->orig_p0 = -1;
childregs->ipend = 0x8000;
__asm__ __volatile__("%0 = syscfg;":"=da"(childregs->syscfg):);
p->thread.usp = 0;
} else {
*childregs = *regs;
childregs->r0 = 0;
p->thread.usp = usp;
v[0] = v[1] = 0;
}
p->thread.usp = usp;
p->thread.ksp = (unsigned long)childregs;
p->thread.ksp = (unsigned long)v;
p->thread.pc = (unsigned long)ret_from_fork;
return 0;
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys_execve(const char __user *name,
const char __user *const __user *argv,
const char __user *const __user *envp)
{
int error;
struct filename *filename;
struct pt_regs *regs = (struct pt_regs *)((&name) + 6);
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
return error;
}
unsigned long get_wchan(struct task_struct *p)
{
unsigned long fp, pc;

55
arch/blackfin/mach-common/entry.S
View File

@ -530,61 +530,6 @@ ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
jump .Lsyscall_really_exit;
ENDPROC(_trap)
ENTRY(_kernel_execve)
link SIZEOF_PTREGS;
p0 = sp;
r3 = SIZEOF_PTREGS / 4;
r4 = 0(x);
.Lclear_regs:
[p0++] = r4;
r3 += -1;
cc = r3 == 0;
if !cc jump .Lclear_regs (bp);
p0 = sp;
sp += -16;
[sp + 12] = p0;
pseudo_long_call _do_execve, p5;
SP += 16;
cc = r0 == 0;
if ! cc jump .Lexecve_failed;
/* Success. Copy our temporary pt_regs to the top of the kernel
* stack and do a normal exception return.
*/
r1 = sp;
r0 = (-KERNEL_STACK_SIZE) (x);
r1 = r1 & r0;
p2 = r1;
p3 = [p2];
r0 = KERNEL_STACK_SIZE - 4 (z);
p1 = r0;
p1 = p1 + p2;
p0 = fp;
r4 = [p0--];
r3 = SIZEOF_PTREGS / 4;
.Lcopy_regs:
r4 = [p0--];
[p1--] = r4;
r3 += -1;
cc = r3 == 0;
if ! cc jump .Lcopy_regs (bp);
r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
p1 = r0;
p1 = p1 + p2;
sp = p1;
r0 = syscfg;
[SP + PT_SYSCFG] = r0;
[p3 + (TASK_THREAD + THREAD_KSP)] = sp;
RESTORE_CONTEXT;
rti;
.Lexecve_failed:
unlink;
rts;
ENDPROC(_kernel_execve)
ENTRY(_system_call)
/* Store IPEND */
p2.l = lo(IPEND);

1
arch/c6x/Kconfig
View File

@ -18,6 +18,7 @@ config C6X
select OF_EARLY_FLATTREE
select GENERIC_CLOCKEVENTS
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
select MODULES_USE_ELF_RELA
config MMU

1
arch/c6x/include/uapi/asm/unistd.h
View File

@ -14,7 +14,6 @@
* more details.
*/
#define __ARCH_WANT_KERNEL_EXECVE
#define __ARCH_WANT_SYS_EXECVE
/* Use the standard ABI for syscalls. */

12
arch/c6x/kernel/entry.S
View File

@ -413,19 +413,9 @@ ENTRY(ret_from_kernel_thread)
0:
B .S2 B10 /* call fn */
LDW .D2T1 *+SP(REGS_A1+8),A4 /* get arg */
MVKL .S2 sys_exit,B11
MVKH .S2 sys_exit,B11
ADDKPC .S2 0f,B3,1
0:
BNOP .S2 B11,5 /* jump to sys_exit */
ADDKPC .S2 ret_from_fork_2,B3,3
ENDPROC(ret_from_kernel_thread)
ENTRY(ret_from_kernel_execve)
GET_THREAD_INFO A12
BNOP .S2 syscall_exit,4
ADD .D2X A4,-8,SP
ENDPROC(ret_from_kernel_execve)
;;
;; These are the interrupt handlers, responsible for calling __do_IRQ()
;; int6 is used for syscalls (see _system_call entry)

2
arch/cris/Kconfig
View File

@ -49,6 +49,8 @@ config CRIS
select GENERIC_SMP_IDLE_THREAD if ETRAX_ARCH_V32
select GENERIC_CMOS_UPDATE
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
config HZ
int

17
arch/cris/arch-v10/kernel/entry.S
View File

@ -35,6 +35,7 @@
.globl system_call
.globl ret_from_intr
.globl ret_from_fork
.globl ret_from_kernel_thread
.globl resume
.globl multiple_interrupt
.globl hwbreakpoint
@ -81,7 +82,14 @@ ret_from_fork:
jsr schedule_tail
ba ret_from_sys_call
nop
ret_from_kernel_thread:
jsr schedule_tail
move.d $r2, $r10 ; argument is here
jsr $r1 ; call the payload
moveq 0, $r9 ; no syscall restarts, TYVM...
ba ret_from_sys_call
ret_from_intr:
;; check for resched if preemptive kernel or if we're going back to user-mode
;; this test matches the user_regs(regs) macro
@ -586,13 +594,6 @@ _ugdb_handle_breakpoint:
ba do_sigtrap ; SIGTRAP the offending process.
pop $dccr ; Restore dccr in delay slot.
.global kernel_execve
kernel_execve:
move.d __NR_execve, $r9
break 13
ret
nop
.data
hw_bp_trigs:

106
arch/cris/arch-v10/kernel/process.c
View File

@ -17,6 +17,7 @@
#include <arch/svinto.h>
#include <linux/init.h>
#include <arch/system.h>
#include <asm/ptrace.h>
#ifdef CONFIG_ETRAX_GPIO
void etrax_gpio_wake_up_check(void); /* drivers/gpio.c */
@ -81,31 +82,6 @@ unsigned long thread_saved_pc(struct task_struct *t)
return task_pt_regs(t)->irp;
}
static void kernel_thread_helper(void* dummy, int (*fn)(void *), void * arg)
{
fn(arg);
do_exit(-1); /* Should never be called, return bad exit value */
}
/*
* Create a kernel thread
*/
int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
/* Don't use r10 since that is set to 0 in copy_thread */
regs.r11 = (unsigned long)fn;
regs.r12 = (unsigned long)arg;
regs.irp = (unsigned long)kernel_thread_helper;
regs.dccr = 1 << I_DCCR_BITNR;
/* Ok, create the new process.. */
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
/* setup the child's kernel stack with a pt_regs and switch_stack on it.
* it will be un-nested during _resume and _ret_from_sys_call when the
* new thread is scheduled.
@ -115,29 +91,35 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
*
*/
asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long unused,
unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs * childregs;
struct switch_stack *swstack;
struct pt_regs *childregs = task_pt_regs(p);
struct switch_stack *swstack = ((struct switch_stack *)childregs) - 1;
/* put the pt_regs structure at the end of the new kernel stack page and fix it up
* remember that the task_struct doubles as the kernel stack for the task
*/
childregs = task_pt_regs(p);
if (unlikely(p->flags & PF_KTHREAD)) {
memset(swstack, 0,
sizeof(struct switch_stack) + sizeof(struct pt_regs));
swstack->r1 = usp;
swstack->r2 = arg;
childregs->dccr = 1 << I_DCCR_BITNR;
swstack->return_ip = (unsigned long) ret_from_kernel_thread;
p->thread.ksp = (unsigned long) swstack;
p->thread.usp = 0;
return 0;
}
*childregs = *regs; /* struct copy of pt_regs */
p->set_child_tid = p->clear_child_tid = NULL;
childregs->r10 = 0; /* child returns 0 after a fork/clone */
/* put the switch stack right below the pt_regs */
swstack = ((struct switch_stack *)childregs) - 1;
/* put the switch stack right below the pt_regs */
swstack->r9 = 0; /* parameter to ret_from_sys_call, 0 == dont restart the syscall */
@ -147,7 +129,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
/* fix the user-mode stackpointer */
p->thread.usp = usp;
p->thread.usp = usp;
/* and the kernel-mode one */
@ -161,68 +143,28 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
return 0;
}
/*
* Be aware of the "magic" 7th argument in the four system-calls below.
* They need the latest stackframe, which is put as the 7th argument by
* entry.S. The previous arguments are dummies or actually used, but need
* to be defined to reach the 7th argument.
*
* N.B.: Another method to get the stackframe is to use current_regs(). But
* it returns the latest stack-frame stacked when going from _user mode_ and
* some of these (at least sys_clone) are called from kernel-mode sometimes
* (for example during kernel_thread, above) and thus cannot use it. Thus,
* to be sure not to get any surprises, we use the method for the other calls
* as well.
*/
asmlinkage int sys_fork(long r10, long r11, long r12, long r13, long mof, long srp,
struct pt_regs *regs)
asmlinkage int sys_fork(void)
{
return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
return do_fork(SIGCHLD, rdusp(), current_pt_regs(), 0, NULL, NULL);
}
/* if newusp is 0, we just grab the old usp */
/* FIXME: Is parent_tid/child_tid really third/fourth argument? Update lib? */
asmlinkage int sys_clone(unsigned long newusp, unsigned long flags,
int* parent_tid, int* child_tid, long mof, long srp,
struct pt_regs *regs)
int* parent_tid, int* child_tid)
{
if (!newusp)
newusp = rdusp();
return do_fork(flags, newusp, regs, 0, parent_tid, child_tid);
return do_fork(flags, newusp, current_pt_regs(), 0, parent_tid, child_tid);
}
/* vfork is a system call in i386 because of register-pressure - maybe
* we can remove it and handle it in libc but we put it here until then.
*/
asmlinkage int sys_vfork(long r10, long r11, long r12, long r13, long mof, long srp,
struct pt_regs *regs)
asmlinkage int sys_vfork(void)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys_execve(const char *fname,
const char *const *argv,
const char *const *envp,
long r13, long mof, long srp,
struct pt_regs *regs)
{
int error;
struct filename *filename;
filename = getname(fname);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
out:
return error;
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), current_pt_regs(), 0, NULL, NULL);
}
unsigned long get_wchan(struct task_struct *p)

22
arch/cris/arch-v32/kernel/entry.S
View File

@ -31,6 +31,7 @@
.globl system_call
.globl ret_from_intr
.globl ret_from_fork
.globl ret_from_kernel_thread
.globl resume
.globl multiple_interrupt
.globl nmi_interrupt
@ -84,6 +85,18 @@ ret_from_fork:
nop
.size ret_from_fork, . - ret_from_fork
.type ret_from_kernel_thread,@function
ret_from_kernel_thread:
jsr schedule_tail
nop
move.d $r2, $r10
jsr $r1
nop
moveq 0, $r9 ; no syscall restarts, TYVM...
ba ret_from_sys_call
nop
.size ret_from_kernel_thread, . - ret_from_kernel_thread
.type ret_from_intr,@function
ret_from_intr:
;; Check for resched if preemptive kernel, or if we're going back to
@ -531,15 +544,6 @@ _ugdb_handle_exception:
ba do_sigtrap ; SIGTRAP the offending process.
move.d [$sp+], $r0 ; Restore R0 in delay slot.
.global kernel_execve
.type kernel_execve,@function
kernel_execve:
move.d __NR_execve, $r9
break 13
ret
nop
.size kernel_execve, . - kernel_execve
.data
.section .rodata,"a"

96
arch/cris/arch-v32/kernel/process.c
View File

@ -16,6 +16,7 @@
#include <hwregs/reg_map.h>
#include <hwregs/timer_defs.h>
#include <hwregs/intr_vect_defs.h>
#include <asm/ptrace.h>
extern void stop_watchdog(void);
@ -94,31 +95,6 @@ unsigned long thread_saved_pc(struct task_struct *t)
return task_pt_regs(t)->erp;
}
static void
kernel_thread_helper(void* dummy, int (*fn)(void *), void * arg)
{
fn(arg);
do_exit(-1); /* Should never be called, return bad exit value. */
}
/* Create a kernel thread. */
int
kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
/* Don't use r10 since that is set to 0 in copy_thread. */
regs.r11 = (unsigned long) fn;
regs.r12 = (unsigned long) arg;
regs.erp = (unsigned long) kernel_thread_helper;
regs.ccs = 1 << (I_CCS_BITNR + CCS_SHIFT);
/* Create the new process. */
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
/*
* Setup the child's kernel stack with a pt_regs and call switch_stack() on it.
* It will be unnested during _resume and _ret_from_sys_call when the new thread
@ -129,23 +105,33 @@ kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
*/
extern asmlinkage void ret_from_fork(void);
extern asmlinkage void ret_from_kernel_thread(void);
int
copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long unused,
unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs;
struct switch_stack *swstack;
struct pt_regs *childregs = task_pt_regs(p);
struct switch_stack *swstack = ((struct switch_stack *) childregs) - 1;
/*
* Put the pt_regs structure at the end of the new kernel stack page and
* fix it up. Note: the task_struct doubles as the kernel stack for the
* task.
*/
childregs = task_pt_regs(p);
if (unlikely(p->flags & PF_KTHREAD)) {
memset(swstack, 0,
sizeof(struct switch_stack) + sizeof(struct pt_regs));
swstack->r1 = usp;
swstack->r2 = arg;
childregs->ccs = 1 << (I_CCS_BITNR + CCS_SHIFT);
swstack->return_ip = (unsigned long) ret_from_kernel_thread;
p->thread.ksp = (unsigned long) swstack;
p->thread.usp = 0;
return 0;
}
*childregs = *regs; /* Struct copy of pt_regs. */
p->set_child_tid = p->clear_child_tid = NULL;
childregs->r10 = 0; /* Child returns 0 after a fork/clone. */
/* Set a new TLS ?
@ -156,7 +142,6 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
}
/* Put the switch stack right below the pt_regs. */
swstack = ((struct switch_stack *) childregs) - 1;
/* Parameter to ret_from_sys_call. 0 is don't restart the syscall. */
swstack->r9 = 0;
@ -174,35 +159,21 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
return 0;
}
/*
* Be aware of the "magic" 7th argument in the four system-calls below.
* They need the latest stackframe, which is put as the 7th argument by
* entry.S. The previous arguments are dummies or actually used, but need
* to be defined to reach the 7th argument.
*
* N.B.: Another method to get the stackframe is to use current_regs(). But
* it returns the latest stack-frame stacked when going from _user mode_ and
* some of these (at least sys_clone) are called from kernel-mode sometimes
* (for example during kernel_thread, above) and thus cannot use it. Thus,
* to be sure not to get any surprises, we use the method for the other calls
* as well.
*/
asmlinkage int
sys_fork(long r10, long r11, long r12, long r13, long mof, long srp,
struct pt_regs *regs)
sys_fork(void)
{
return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
return do_fork(SIGCHLD, rdusp(), current_pt_regs(), 0, NULL, NULL);
}
/* FIXME: Is parent_tid/child_tid really third/fourth argument? Update lib? */
asmlinkage int
sys_clone(unsigned long newusp, unsigned long flags, int *parent_tid, int *child_tid,
unsigned long tls, long srp, struct pt_regs *regs)
unsigned long tls)
{
if (!newusp)
newusp = rdusp();
return do_fork(flags, newusp, regs, 0, parent_tid, child_tid);
return do_fork(flags, newusp, current_pt_regs(), 0, parent_tid, child_tid);
}
/*
@ -210,32 +181,9 @@ sys_clone(unsigned long newusp, unsigned long flags, int *parent_tid, int *child
* we can remove it and handle it in libc but we put it here until then.
*/
asmlinkage int
sys_vfork(long r10, long r11, long r12, long r13, long mof, long srp,
struct pt_regs *regs)
sys_vfork(void)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
}
/* sys_execve() executes a new program. */
asmlinkage int
sys_execve(const char *fname,
const char *const *argv,
const char *const *envp, long r13, long mof, long srp,
struct pt_regs *regs)
{
int error;
struct filename *filename;
filename = getname(fname);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
out:
return error;
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), current_pt_regs(), 0, NULL, NULL);
}
unsigned long

2
arch/cris/include/asm/processor.h
View File

@ -49,8 +49,6 @@ struct task_struct;
#define task_pt_regs(task) user_regs(task_thread_info(task))
#define current_regs() task_pt_regs(current)
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
unsigned long get_wchan(struct task_struct *p);
#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)

1
arch/cris/include/asm/unistd.h
View File

@ -371,6 +371,7 @@
#define __ARCH_WANT_SYS_SIGPROCMASK
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
/*
* "Conditional" syscalls

1
arch/cris/kernel/crisksyms.c
View File

@ -30,7 +30,6 @@ extern void __negdi2(void);
extern void iounmap(volatile void * __iomem);
/* Platform dependent support */
EXPORT_SYMBOL(kernel_thread);
EXPORT_SYMBOL(get_cmos_time);
EXPORT_SYMBOL(loops_per_usec);

2
arch/h8300/Kconfig
View File

@ -8,6 +8,8 @@ config H8300
select GENERIC_IRQ_SHOW
select GENERIC_CPU_DEVICES
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
config SYMBOL_PREFIX
string

2
arch/h8300/include/asm/processor.h
View File

@ -107,8 +107,6 @@ static inline void release_thread(struct task_struct *dead_task)
{
}
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/*
* Free current thread data structures etc..
*/

2
arch/h8300/include/asm/ptrace.h
View File

@ -60,6 +60,8 @@ struct pt_regs {
#define user_mode(regs) (!((regs)->ccr & PS_S))
#define instruction_pointer(regs) ((regs)->pc)
#define profile_pc(regs) instruction_pointer(regs)
#define current_pt_regs() ((struct pt_regs *) \
(THREAD_SIZE + (unsigned long)current_thread_info()) - 1)
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
#endif /* _H8300_PTRACE_H */

1
arch/h8300/include/asm/unistd.h
View File

@ -356,6 +356,7 @@
#define __ARCH_WANT_SYS_SIGPROCMASK
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
/*
* "Conditional" syscalls

9
arch/h8300/kernel/entry.S
View File

@ -158,6 +158,7 @@ INTERRUPTS = 128
.globl SYMBOL_NAME(system_call)
.globl SYMBOL_NAME(ret_from_exception)
.globl SYMBOL_NAME(ret_from_fork)
.globl SYMBOL_NAME(ret_from_kernel_thread)
.globl SYMBOL_NAME(ret_from_interrupt)
.globl SYMBOL_NAME(interrupt_redirect_table)
.globl SYMBOL_NAME(sw_ksp),SYMBOL_NAME(sw_usp)
@ -330,6 +331,14 @@ SYMBOL_NAME_LABEL(ret_from_fork)
jsr @SYMBOL_NAME(schedule_tail)
jmp @SYMBOL_NAME(ret_from_exception)
SYMBOL_NAME_LABEL(ret_from_kernel_thread)
mov.l er2,er0
jsr @SYMBOL_NAME(schedule_tail)
mov.l @(LER4:16,sp),er0
mov.l @(LER5:16,sp),er1
jsr @er1
jmp @SYMBOL_NAME(ret_from_exception)
SYMBOL_NAME_LABEL(resume)
/*
* Beware - when entering resume, offset of tss is in d1,

1
arch/h8300/kernel/h8300_ksyms.c
View File

@ -33,7 +33,6 @@ EXPORT_SYMBOL(strncmp);
EXPORT_SYMBOL(ip_fast_csum);
EXPORT_SYMBOL(kernel_thread);
EXPORT_SYMBOL(enable_irq);
EXPORT_SYMBOL(disable_irq);

62
arch/h8300/kernel/process.c
View File

@ -47,6 +47,7 @@ void (*pm_power_off)(void) = NULL;
EXPORT_SYMBOL(pm_power_off);
asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);
/*
* The idle loop on an H8/300..
@ -122,39 +123,6 @@ void show_regs(struct pt_regs * regs)
printk("\n");
}
/*
* Create a kernel thread
*/
int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
long retval;
long clone_arg;
mm_segment_t fs;
fs = get_fs();
set_fs (KERNEL_DS);
clone_arg = flags | CLONE_VM;
__asm__("mov.l sp,er3\n\t"
"sub.l er2,er2\n\t"
"mov.l %2,er1\n\t"
"mov.l %1,er0\n\t"
"trapa #0\n\t"
"cmp.l sp,er3\n\t"
"beq 1f\n\t"
"mov.l %4,er0\n\t"
"mov.l %3,er1\n\t"
"jsr @er1\n\t"
"mov.l %5,er0\n\t"
"trapa #0\n"
"1:\n\t"
"mov.l er0,%0"
:"=r"(retval)
:"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit)
:"er0","er1","er2","er3");
set_fs (fs);
return retval;
}
void flush_thread(void)
{
}
@ -198,6 +166,13 @@ int copy_thread(unsigned long clone_flags,
childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
if (unlikely(p->flags & PF_KTHREAD)) {
memset(childregs, 0, sizeof(struct pt_regs));
childregs->retpc = (unsigned long) ret_from_kernel_thread;
childregs->er4 = topstk; /* arg */
childregs->er5 = usp; /* fn */
p->thread.ksp = (unsigned long)childregs;
}
*childregs = *regs;
childregs->retpc = (unsigned long) ret_from_fork;
childregs->er0 = 0;
@ -208,27 +183,6 @@ int copy_thread(unsigned long clone_flags,
return 0;
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys_execve(const char *name,
const char *const *argv,
const char *const *envp,
int dummy, ...)
{
int error;
struct filename *filename;
struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
return error;
}
unsigned long thread_saved_pc(struct task_struct *tsk)
{
return ((struct pt_regs *)tsk->thread.esp0)->pc;

26
arch/h8300/kernel/sys_h8300.c
View File

@ -46,29 +46,3 @@ asmlinkage void syscall_print(void *dummy,...)
((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
}
#endif
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
asmlinkage
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
register long res __asm__("er0");
register const char *const *_c __asm__("er3") = envp;
register const char *const *_b __asm__("er2") = argv;
register const char * _a __asm__("er1") = filename;
__asm__ __volatile__ ("mov.l %1,er0\n\t"
"trapa #0\n\t"
: "=r" (res)
: "g" (__NR_execve),
"g" (_a),
"g" (_b),
"g" (_c)
: "cc", "memory");
return res;
}

2
arch/hexagon/Kconfig
View File

@ -31,6 +31,8 @@ config HEXAGON
select GENERIC_CLOCKEVENTS
select GENERIC_CLOCKEVENTS_BROADCAST
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
---help---
Qualcomm Hexagon is a processor architecture designed for high
performance and low power across a wide variety of applications.

1
arch/hexagon/include/asm/processor.h
View File

@ -34,7 +34,6 @@
struct task_struct;
/* this is defined in arch/process.c */
extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
extern unsigned long thread_saved_pc(struct task_struct *tsk);
extern void start_thread(struct pt_regs *, unsigned long, unsigned long);

4
arch/hexagon/include/uapi/asm/ptrace.h
View File

@ -32,4 +32,8 @@
extern int regs_query_register_offset(const char *name);
extern const char *regs_query_register_name(unsigned int offset);
#define current_pt_regs() \
((struct pt_regs *) \
((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
#endif

1
arch/hexagon/include/uapi/asm/unistd.h
View File

@ -27,5 +27,6 @@
*/
#define sys_mmap2 sys_mmap_pgoff
#define __ARCH_WANT_SYS_EXECVE
#include <asm-generic/unistd.h>

102
arch/hexagon/kernel/process.c
View File

@ -25,33 +25,6 @@
#include <linux/uaccess.h>
#include <linux/slab.h>
/*
* Kernel thread creation. The desired kernel function is "wrapped"
* in the kernel_thread_helper function, which does cleanup
* afterwards.
*/
static void __noreturn kernel_thread_helper(void *arg, int (*fn)(void *))
{
do_exit(fn(arg));
}
int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
/*
* Yes, we're exploting illicit knowledge of the ABI here.
*/
regs.r00 = (unsigned long) arg;
regs.r01 = (unsigned long) fn;
pt_set_elr(&regs, (unsigned long)kernel_thread_helper);
pt_set_kmode(&regs);
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);
/*
* Program thread launch. Often defined as a macro in processor.h,
* but we're shooting for a small footprint and it's not an inner-loop
@ -114,7 +87,7 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
* Copy architecture-specific thread state
*/
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long unused, struct task_struct *p,
unsigned long arg, struct task_struct *p,
struct pt_regs *regs)
{
struct thread_info *ti = task_thread_info(p);
@ -125,61 +98,50 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
childregs = (struct pt_regs *) (((unsigned long) ti + THREAD_SIZE) -
sizeof(*childregs));
memcpy(childregs, regs, sizeof(*childregs));
ti->regs = childregs;
/*
* Establish kernel stack pointer and initial PC for new thread
* Note that unlike the usual situation, we do not copy the
* parent's callee-saved here; those are in pt_regs and whatever
* we leave here will be overridden on return to userland.
*/
ss = (struct hexagon_switch_stack *) ((unsigned long) childregs -
sizeof(*ss));
ss->lr = (unsigned long)ret_from_fork;
p->thread.switch_sp = ss;
/* If User mode thread, set pt_reg stack pointer as per parameter */
if (user_mode(childregs)) {
pt_set_rte_sp(childregs, usp);
/* Child sees zero return value */
childregs->r00 = 0;
/*
* The clone syscall has the C signature:
* int [r0] clone(int flags [r0],
* void *child_frame [r1],
* void *parent_tid [r2],
* void *child_tid [r3],
* void *thread_control_block [r4]);
* ugp is used to provide TLS support.
*/
if (clone_flags & CLONE_SETTLS)
childregs->ugp = childregs->r04;
/*
* Parent sees new pid -- not necessary, not even possible at
* this point in the fork process
* Might also want to set things like ti->addr_limit
*/
} else {
/*
* If kernel thread, resume stack is kernel stack base.
* Note that this is pointer arithmetic on pt_regs *
*/
pt_set_rte_sp(childregs, (unsigned long)(childregs + 1));
/*
* We need the current thread_info fast path pointer
* set up in pt_regs. The register to be used is
* parametric for assembler code, but the mechanism
* doesn't drop neatly into C. Needs to be fixed.
*/
childregs->THREADINFO_REG = (unsigned long) ti;
if (unlikely(p->flags & PF_KTHREAD)) {
memset(childregs, 0, sizeof(struct pt_regs));
/* r24 <- fn, r25 <- arg */
ss->r2524 = usp | ((u64)arg << 32);
pt_set_kmode(childregs);
return 0;
}
memcpy(childregs, regs, sizeof(*childregs));
ss->r2524 = 0;
pt_set_rte_sp(childregs, usp);
/* Child sees zero return value */
childregs->r00 = 0;
/*
* thread_info pointer is pulled out of task_struct "stack"
* field on switch_to.
* The clone syscall has the C signature:
* int [r0] clone(int flags [r0],
* void *child_frame [r1],
* void *parent_tid [r2],
* void *child_tid [r3],
* void *thread_control_block [r4]);
* ugp is used to provide TLS support.
*/
if (clone_flags & CLONE_SETTLS)
childregs->ugp = childregs->r04;
/*
* Parent sees new pid -- not necessary, not even possible at
* this point in the fork process
* Might also want to set things like ti->addr_limit
*/
p->stack = (void *)ti;
return 0;
}

4
arch/hexagon/kernel/signal.c
View File

@ -249,14 +249,14 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
*/
asmlinkage int sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
{
struct pt_regs *regs = current_thread_info()->regs;
struct pt_regs *regs = current_pt_regs();
return do_sigaltstack(uss, uoss, regs->r29);
}
asmlinkage int sys_rt_sigreturn(void)
{
struct pt_regs *regs = current_thread_info()->regs;
struct pt_regs *regs = current_pt_regs();
struct rt_sigframe __user *frame;
sigset_t blocked;

44
arch/hexagon/kernel/syscall.c
View File

@ -35,55 +35,13 @@
* See signal.c for signal-related system call wrappers.
*/
asmlinkage int sys_execve(char __user *ufilename,
const char __user *const __user *argv,
const char __user *const __user *envp)
{
struct pt_regs *pregs = current_thread_info()->regs;
struct filename *filename;
int retval;
filename = getname(ufilename);
retval = PTR_ERR(filename);
if (IS_ERR(filename))
return retval;
retval = do_execve(filename->name, argv, envp, pregs);
putname(filename);
return retval;
}
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
unsigned long parent_tidp, unsigned long child_tidp)
{
struct pt_regs *pregs = current_thread_info()->regs;
struct pt_regs *pregs = current_pt_regs();
if (!newsp)
newsp = pregs->SP;
return do_fork(clone_flags, newsp, pregs, 0, (int __user *)parent_tidp,
(int __user *)child_tidp);
}
/*
* Do a system call from the kernel, so as to have a proper pt_regs
* and recycle the sys_execvpe infrustructure.
*/
int kernel_execve(const char *filename,
const char *const argv[], const char *const envp[])
{
register unsigned long __a0 asm("r0") = (unsigned long) filename;
register unsigned long __a1 asm("r1") = (unsigned long) argv;
register unsigned long __a2 asm("r2") = (unsigned long) envp;
int retval;
__asm__ volatile(
" R6 = #%4;\n"
" trap0(#1);\n"
" %0 = R0;\n"
: "=r" (retval)
: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
);
return retval;
}

4
arch/hexagon/kernel/vm_entry.S
View File

@ -266,4 +266,8 @@ _K_enter_machcheck:
.globl ret_from_fork
ret_from_fork:
call schedule_tail
P0 = cmp.eq(R24, #0);
if P0 jump return_from_syscall
R0 = R25;
callr R24
jump return_from_syscall

2
arch/ia64/Kconfig
View File

@ -42,6 +42,8 @@ config IA64
select GENERIC_TIME_VSYSCALL_OLD
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
default y
help
The Itanium Processor Family is Intel's 64-bit successor to

16
arch/ia64/include/asm/processor.h
View File

@ -340,22 +340,6 @@ struct task_struct;
*/
#define release_thread(dead_task)
/*
* This is the mechanism for creating a new kernel thread.
*
* NOTE 1: Only a kernel-only process (ie the swapper or direct
* descendants who haven't done an "execve()") should use this: it
* will work within a system call from a "real" process, but the
* process memory space will not be free'd until both the parent and
* the child have exited.
*
* NOTE 2: This MUST NOT be an inlined function. Otherwise, we get
* into trouble in init/main.c when the child thread returns to
* do_basic_setup() and the timing is such that free_initmem() has
* been called already.
*/
extern pid_t kernel_thread (int (*fn)(void *), void *arg, unsigned long flags);
/* Get wait channel for task P. */
extern unsigned long get_wchan (struct task_struct *p);

1
arch/ia64/include/asm/unistd.h
View File

@ -29,6 +29,7 @@
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
#if !defined(__ASSEMBLY__) && !defined(ASSEMBLER)

39
arch/ia64/kernel/entry.S
View File

@ -61,14 +61,13 @@ ENTRY(ia64_execve)
* Allocate 8 input registers since ptrace() may clobber them
*/
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
alloc loc1=ar.pfs,8,2,4,0
alloc loc1=ar.pfs,8,2,3,0
mov loc0=rp
.body
mov out0=in0 // filename
;; // stop bit between alloc and call
mov out1=in1 // argv
mov out2=in2 // envp
add out3=16,sp // regs
br.call.sptk.many rp=sys_execve
.ret0:
cmp4.ge p6,p7=r8,r0
@ -76,7 +75,6 @@ ENTRY(ia64_execve)
sxt4 r8=r8 // return 64-bit result
;;
stf.spill [sp]=f0
(p6) cmp.ne pKStk,pUStk=r0,r0 // a successful execve() lands us in user-mode...
mov rp=loc0
(p6) mov ar.pfs=r0 // clear ar.pfs on success
(p7) br.ret.sptk.many rp
@ -484,19 +482,6 @@ GLOBAL_ENTRY(prefetch_stack)
br.ret.sptk.many rp
END(prefetch_stack)
GLOBAL_ENTRY(kernel_execve)
rum psr.ac
mov r15=__NR_execve // put syscall number in place
break __BREAK_SYSCALL
br.ret.sptk.many rp
END(kernel_execve)
GLOBAL_ENTRY(clone)
mov r15=__NR_clone // put syscall number in place
break __BREAK_SYSCALL
br.ret.sptk.many rp
END(clone)
/*
* Invoke a system call, but do some tracing before and after the call.
* We MUST preserve the current register frame throughout this routine
@ -600,6 +585,27 @@ GLOBAL_ENTRY(ia64_strace_leave_kernel)
.ret4: br.cond.sptk ia64_leave_kernel
END(ia64_strace_leave_kernel)
ENTRY(call_payload)
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(0)
/* call the kernel_thread payload; fn is in r4, arg - in r5 */
alloc loc1=ar.pfs,0,3,1,0
mov loc0=rp
mov loc2=gp
mov out0=r5 // arg
ld8 r14 = [r4], 8 // fn.address
;;
mov b6 = r14
ld8 gp = [r4] // fn.gp
;;
br.call.sptk.many rp=b6 // fn(arg)
.ret12: mov gp=loc2
mov rp=loc0
mov ar.pfs=loc1
/* ... and if it has returned, we are going to userland */
cmp.ne pKStk,pUStk=r0,r0
br.ret.sptk.many rp
END(call_payload)
GLOBAL_ENTRY(ia64_ret_from_clone)
PT_REGS_UNWIND_INFO(0)
{ /*
@ -616,6 +622,7 @@ GLOBAL_ENTRY(ia64_ret_from_clone)
br.call.sptk.many rp=ia64_invoke_schedule_tail
}
.ret8:
(pKStk) br.call.sptk.many rp=call_payload
adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
;;
ld4 r2=[r2]

13
arch/ia64/kernel/head.S
View File

@ -1093,19 +1093,6 @@ GLOBAL_ENTRY(cycle_to_cputime)
END(cycle_to_cputime)
#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
GLOBAL_ENTRY(start_kernel_thread)
.prologue
.save rp, r0 // this is the end of the call-chain
.body
alloc r2 = ar.pfs, 0, 0, 2, 0
mov out0 = r9
mov out1 = r11;;
br.call.sptk.many rp = kernel_thread_helper;;
mov out0 = r8
br.call.sptk.many rp = sys_exit;;
1: br.sptk.few 1b // not reached
END(start_kernel_thread)
#ifdef CONFIG_IA64_BRL_EMU
/*

158
arch/ia64/kernel/process.c
View File

@ -401,64 +401,15 @@ copy_thread(unsigned long clone_flags,
struct pt_regs *child_ptregs;
int retval = 0;
#ifdef CONFIG_SMP
/*
* For SMP idle threads, fork_by_hand() calls do_fork with
* NULL regs.
*/
if (!regs)
return 0;
#endif
stack = ((struct switch_stack *) regs) - 1;
child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1;
child_stack = (struct switch_stack *) child_ptregs - 1;
/* copy parent's switch_stack & pt_regs to child: */
memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack));
rbs = (unsigned long) current + IA64_RBS_OFFSET;
child_rbs = (unsigned long) p + IA64_RBS_OFFSET;
rbs_size = stack->ar_bspstore - rbs;
/* copy the parent's register backing store to the child: */
memcpy((void *) child_rbs, (void *) rbs, rbs_size);
if (likely(user_mode(child_ptregs))) {
if (clone_flags & CLONE_SETTLS)
child_ptregs->r13 = regs->r16; /* see sys_clone2() in entry.S */
if (user_stack_base) {
child_ptregs->r12 = user_stack_base + user_stack_size - 16;
child_ptregs->ar_bspstore = user_stack_base;
child_ptregs->ar_rnat = 0;
child_ptregs->loadrs = 0;
}
} else {
/*
* Note: we simply preserve the relative position of
* the stack pointer here. There is no need to
* allocate a scratch area here, since that will have
* been taken care of by the caller of sys_clone()
* already.
*/
child_ptregs->r12 = (unsigned long) child_ptregs - 16; /* kernel sp */
child_ptregs->r13 = (unsigned long) p; /* set `current' pointer */
}
child_stack->ar_bspstore = child_rbs + rbs_size;
child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
/* copy parts of thread_struct: */
p->thread.ksp = (unsigned long) child_stack - 16;
/* stop some PSR bits from being inherited.
* the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
* therefore we must specify them explicitly here and not include them in
* IA64_PSR_BITS_TO_CLEAR.
*/
child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
& ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
/*
* NOTE: The calling convention considers all floating point
* registers in the high partition (fph) to be scratch. Since
@ -480,8 +431,66 @@ copy_thread(unsigned long clone_flags,
# define THREAD_FLAGS_TO_SET 0
p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR)
| THREAD_FLAGS_TO_SET);
ia64_drop_fpu(p); /* don't pick up stale state from a CPU's fph */
if (unlikely(p->flags & PF_KTHREAD)) {
if (unlikely(!user_stack_base)) {
/* fork_idle() called us */
return 0;
}
memset(child_stack, 0, sizeof(*child_ptregs) + sizeof(*child_stack));
child_stack->r4 = user_stack_base; /* payload */
child_stack->r5 = user_stack_size; /* argument */
/*
* Preserve PSR bits, except for bits 32-34 and 37-45,
* which we can't read.
*/
child_ptregs->cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN;
/* mark as valid, empty frame */
child_ptregs->cr_ifs = 1UL << 63;
child_stack->ar_fpsr = child_ptregs->ar_fpsr
= ia64_getreg(_IA64_REG_AR_FPSR);
child_stack->pr = (1 << PRED_KERNEL_STACK);
child_stack->ar_bspstore = child_rbs;
child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
/* stop some PSR bits from being inherited.
* the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
* therefore we must specify them explicitly here and not include them in
* IA64_PSR_BITS_TO_CLEAR.
*/
child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
& ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
return 0;
}
stack = ((struct switch_stack *) regs) - 1;
/* copy parent's switch_stack & pt_regs to child: */
memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack));
/* copy the parent's register backing store to the child: */
rbs_size = stack->ar_bspstore - rbs;
memcpy((void *) child_rbs, (void *) rbs, rbs_size);
if (clone_flags & CLONE_SETTLS)
child_ptregs->r13 = regs->r16; /* see sys_clone2() in entry.S */
if (user_stack_base) {
child_ptregs->r12 = user_stack_base + user_stack_size - 16;
child_ptregs->ar_bspstore = user_stack_base;
child_ptregs->ar_rnat = 0;
child_ptregs->loadrs = 0;
}
child_stack->ar_bspstore = child_rbs + rbs_size;
child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
/* stop some PSR bits from being inherited.
* the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
* therefore we must specify them explicitly here and not include them in
* IA64_PSR_BITS_TO_CLEAR.
*/
child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
& ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
#ifdef CONFIG_PERFMON
if (current->thread.pfm_context)
pfm_inherit(p, child_ptregs);
@ -608,57 +617,6 @@ dump_fpu (struct pt_regs *pt, elf_fpregset_t dst)
return 1; /* f0-f31 are always valid so we always return 1 */
}
long
sys_execve (const char __user *filename,
const char __user *const __user *argv,
const char __user *const __user *envp,
struct pt_regs *regs)
{
struct filename *fname;
int error;
fname = getname(filename);
error = PTR_ERR(fname);
if (IS_ERR(fname))
goto out;
error = do_execve(fname->name, argv, envp, regs);
putname(fname);
out:
return error;
}
pid_t
kernel_thread (int (*fn)(void *), void *arg, unsigned long flags)
{
extern void start_kernel_thread (void);
unsigned long *helper_fptr = (unsigned long *) &start_kernel_thread;
struct {
struct switch_stack sw;
struct pt_regs pt;
} regs;
memset(&regs, 0, sizeof(regs));
regs.pt.cr_iip = helper_fptr[0]; /* set entry point (IP) */
regs.pt.r1 = helper_fptr[1]; /* set GP */
regs.pt.r9 = (unsigned long) fn; /* 1st argument */
regs.pt.r11 = (unsigned long) arg; /* 2nd argument */
/* Preserve PSR bits, except for bits 32-34 and 37-45, which we can't read. */
regs.pt.cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN;
regs.pt.cr_ifs = 1UL << 63; /* mark as valid, empty frame */
regs.sw.ar_fpsr = regs.pt.ar_fpsr = ia64_getreg(_IA64_REG_AR_FPSR);
regs.sw.ar_bspstore = (unsigned long) current + IA64_RBS_OFFSET;
regs.sw.pr = (1 << PRED_KERNEL_STACK);
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs.pt, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);
/* This gets called from kernel_thread() via ia64_invoke_thread_helper(). */
int
kernel_thread_helper (int (*fn)(void *), void *arg)
{
return (*fn)(arg);
}
/*
* Flush thread state. This is called when a thread does an execve().
*/

2
arch/m32r/Kconfig
View File

@ -15,6 +15,8 @@ config M32R
select GENERIC_ATOMIC64
select ARCH_USES_GETTIMEOFFSET
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
config SBUS
bool

5
arch/m32r/include/asm/processor.h
View File

@ -118,11 +118,6 @@ struct mm_struct;
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/*
* create a kernel thread without removing it from tasklists
*/
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/* Copy and release all segment info associated with a VM */
extern void copy_segments(struct task_struct *p, struct mm_struct * mm);
extern void release_segments(struct mm_struct * mm);

2
arch/m32r/include/asm/ptrace.h
View File

@ -139,6 +139,8 @@ extern void withdraw_debug_trap(struct pt_regs *regs);
#define task_pt_regs(task) \
((struct pt_regs *)(task_stack_page(task) + THREAD_SIZE) - 1)
#define current_pt_regs() ((struct pt_regs *) \
((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
#endif /* __KERNEL */

1
arch/m32r/include/asm/unistd.h
View File

@ -352,6 +352,7 @@
#define __ARCH_WANT_SYS_OLDUMOUNT
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
#define __IGNORE_lchown
#define __IGNORE_setuid

9
arch/m32r/kernel/entry.S
View File

@ -125,6 +125,15 @@
and \reg, sp
.endm
ENTRY(ret_from_kernel_thread)
pop r0
bl schedule_tail
GET_THREAD_INFO(r8)
ld r0, R0(r8)
ld r1, R1(r8)
jl r1
bra syscall_exit
ENTRY(ret_from_fork)
pop r0
bl schedule_tail

104
arch/m32r/kernel/process.c
View File

@ -164,41 +164,6 @@ void show_regs(struct pt_regs * regs)
#endif
}
/*
* Create a kernel thread
*/
/*
* This is the mechanism for creating a new kernel thread.
*
* NOTE! Only a kernel-only process(ie the swapper or direct descendants
* who haven't done an "execve()") should use this: it will work within
* a system call from a "real" process, but the process memory space will
* not be free'd until both the parent and the child have exited.
*/
static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg)
{
fn(arg);
do_exit(-1);
}
int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof (regs));
regs.r1 = (unsigned long)fn;
regs.r2 = (unsigned long)arg;
regs.bpc = (unsigned long)kernel_thread_helper;
regs.psw = M32R_PSW_BIE;
/* Ok, create the new process. */
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL,
NULL);
}
/*
* Free current thread data structures etc..
*/
@ -227,29 +192,35 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
}
int copy_thread(unsigned long clone_flags, unsigned long spu,
unsigned long unused, struct task_struct *tsk, struct pt_regs *regs)
unsigned long arg, struct task_struct *tsk, struct pt_regs *regs)
{
struct pt_regs *childregs = task_pt_regs(tsk);
extern void ret_from_fork(void);
extern void ret_from_kernel_thread(void);
/* Copy registers */
*childregs = *regs;
childregs->spu = spu;
childregs->r0 = 0; /* Child gets zero as return value */
regs->r0 = tsk->pid;
if (unlikely(tsk->flags & PF_KTHREAD)) {
memset(childregs, 0, sizeof(struct pt_regs));
childregs->psw = M32R_PSW_BIE;
childregs->r1 = spu; /* fn */
childregs->r0 = arg;
tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
} else {
/* Copy registers */
*childregs = *regs;
childregs->spu = spu;
childregs->r0 = 0; /* Child gets zero as return value */
tsk->thread.lr = (unsigned long)ret_from_fork;
}
tsk->thread.sp = (unsigned long)childregs;
tsk->thread.lr = (unsigned long)ret_from_fork;
return 0;
}
asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
struct pt_regs regs)
asmlinkage int sys_fork(void)
{
#ifdef CONFIG_MMU
return do_fork(SIGCHLD, regs.spu, &regs, 0, NULL, NULL);
struct pt_regs *regs = current_pt_regs();
return do_fork(SIGCHLD, regs->spu, regs, 0, NULL, NULL);
#else
return -EINVAL;
#endif /* CONFIG_MMU */
@ -257,14 +228,13 @@ asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
unsigned long parent_tidptr,
unsigned long child_tidptr,
unsigned long r4, unsigned long r5, unsigned long r6,
struct pt_regs regs)
unsigned long child_tidptr)
{
struct pt_regs *regs = current_pt_regs();
if (!newsp)
newsp = regs.spu;
newsp = regs->spu;
return do_fork(clone_flags, newsp, &regs, 0,
return do_fork(clone_flags, newsp, regs, 0,
(int __user *)parent_tidptr, (int __user *)child_tidptr);
}
@ -278,37 +248,13 @@ asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
* do not have enough call-clobbered registers to hold all
* the information you need.
*/
asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
struct pt_regs regs)
asmlinkage int sys_vfork(void)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, &regs, 0,
struct pt_regs *regs = current_pt_regs();
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->spu, regs, 0,
NULL, NULL);
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys_execve(const char __user *ufilename,
const char __user *const __user *uargv,
const char __user *const __user *uenvp,
unsigned long r3, unsigned long r4, unsigned long r5,
unsigned long r6, struct pt_regs regs)
{
int error;
struct filename *filename;
filename = getname(ufilename);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename->name, uargv, uenvp, &regs);
putname(filename);
out:
return error;
}
/*
* These bracket the sleeping functions..
*/

21
arch/m32r/kernel/sys_m32r.c
View File

@ -88,24 +88,3 @@ asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
/* Not implemented yet. */
return -ENOSYS;
}
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
register long __scno __asm__ ("r7") = __NR_execve;
register long __arg3 __asm__ ("r2") = (long)(envp);
register long __arg2 __asm__ ("r1") = (long)(argv);
register long __res __asm__ ("r0") = (long)(filename);
__asm__ __volatile__ (
"trap #" SYSCALL_VECTOR "|| nop"
: "=r" (__res)
: "r" (__scno), "0" (__res), "r" (__arg2),
"r" (__arg3)
: "memory");
return __res;
}

1
arch/m68k/Kconfig
View File

@ -16,6 +16,7 @@ config M68K
select ARCH_WANT_IPC_PARSE_VERSION
select ARCH_USES_GETTIMEOFFSET if MMU && !COLDFIRE
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_REL
select MODULES_USE_ELF_RELA

1
arch/m68k/include/asm/unistd.h
View File

@ -32,7 +32,6 @@
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls

7
arch/m68k/kernel/entry.S
View File

@ -115,16 +115,9 @@ ENTRY(ret_from_kernel_thread)
| a3 contains the kernel thread payload, d7 - its argument
movel %d1,%sp@-
jsr schedule_tail
GET_CURRENT(%d0)
movel %d7,(%sp)
jsr %a3@
addql #4,%sp
movel %d0,(%sp)
jra sys_exit
ENTRY(ret_from_kernel_execve)
movel 4(%sp), %sp
GET_CURRENT(%d0)
jra ret_from_exception
#if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)

2
arch/microblaze/Kconfig
View File

@ -26,6 +26,8 @@ config MICROBLAZE
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
config SWAP
def_bool n

8
arch/microblaze/include/asm/processor.h
View File

@ -31,6 +31,7 @@ extern const struct seq_operations cpuinfo_op;
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
extern void ret_from_fork(void);
extern void ret_from_kernel_thread(void);
# endif /* __ASSEMBLY__ */
@ -78,11 +79,6 @@ extern unsigned long thread_saved_pc(struct task_struct *t);
extern unsigned long get_wchan(struct task_struct *p);
/*
* create a kernel thread without removing it from tasklists
*/
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
# define KSTK_EIP(tsk) (0)
# define KSTK_ESP(tsk) (0)
@ -131,8 +127,6 @@ extern inline void release_thread(struct task_struct *dead_task)
{
}
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
/* Free current thread data structures etc. */
static inline void exit_thread(void)
{

1
arch/microblaze/include/asm/unistd.h
View File

@ -422,6 +422,7 @@
#define __ARCH_WANT_SYS_SIGPROCMASK
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
/*
* "Conditional" syscalls

12
arch/microblaze/kernel/entry-nommu.S
View File

@ -474,6 +474,14 @@ ENTRY(ret_from_fork)
brid ret_to_user
nop
ENTRY(ret_from_kernel_thread)
brlid r15, schedule_tail
addk r5, r0, r3
brald r15, r20
addk r5, r0, r19
brid ret_to_user
addk r3, r0, r0
work_pending:
enable_irq
@ -559,10 +567,6 @@ sys_clone:
brid microblaze_clone
addk r7, r1, r0
sys_execve:
brid microblaze_execve
addk r8, r1, r0
sys_rt_sigreturn_wrapper:
brid sys_rt_sigreturn
addk r5, r1, r0

33
arch/microblaze/kernel/entry.S
View File

@ -293,24 +293,6 @@ C_ENTRY(_user_exception):
swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */
addi r14, r14, 4 /* return address is 4 byte after call */
mfs r1, rmsr
nop
andi r1, r1, MSR_UMS
bnei r1, 1f
/* Kernel-mode state save - kernel execve */
lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/
tophys(r1,r1);
addik r1, r1, -PT_SIZE; /* Make room on the stack. */
SAVE_REGS
swi r1, r1, PT_MODE; /* pt_regs -> kernel mode */
brid 2f;
nop; /* Fill delay slot */
/* User-mode state save. */
1:
lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */
tophys(r1,r1);
lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */
@ -479,11 +461,20 @@ C_ENTRY(sys_fork_wrapper):
saved context). */
C_ENTRY(ret_from_fork):
bralid r15, schedule_tail; /* ...which is schedule_tail's arg */
add r3, r5, r0; /* switch_thread returns the prev task */
add r5, r3, r0; /* switch_thread returns the prev task */
/* ( in the delay slot ) */
brid ret_from_trap; /* Do normal trap return */
add r3, r0, r0; /* Child's fork call should return 0. */
C_ENTRY(ret_from_kernel_thread):
bralid r15, schedule_tail; /* ...which is schedule_tail's arg */
add r5, r3, r0; /* switch_thread returns the prev task */
/* ( in the delay slot ) */
brald r15, r20 /* fn was left in r20 */
addk r5, r0, r19 /* ... and argument - in r19 */
brid ret_from_trap
add r3, r0, r0
C_ENTRY(sys_vfork):
brid microblaze_vfork /* Do real work (tail-call) */
addik r5, r1, 0
@ -498,10 +489,6 @@ C_ENTRY(sys_clone):
brid do_fork /* Do real work (tail-call) */
add r8, r0, r0; /* Arg 3: (unused) */
C_ENTRY(sys_execve):
brid microblaze_execve; /* Do real work (tail-call).*/
addik r8, r1, 0; /* add user context as 4th arg */
C_ENTRY(sys_rt_sigreturn_wrapper):
brid sys_rt_sigreturn /* Do real work */
addik r5, r1, 0; /* add user context as 1st arg */

72
arch/microblaze/kernel/process.c
View File

@ -119,46 +119,38 @@ void flush_thread(void)
}
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long unused,
unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs = task_pt_regs(p);
struct thread_info *ti = task_thread_info(p);
if (unlikely(p->flags & PF_KTHREAD)) {
/* if we're creating a new kernel thread then just zeroing all
* the registers. That's OK for a brand new thread.*/
memset(childregs, 0, sizeof(struct pt_regs));
memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
ti->cpu_context.r1 = (unsigned long)childregs;
ti->cpu_context.r20 = (unsigned long)usp; /* fn */
ti->cpu_context.r19 = (unsigned long)arg;
childregs->pt_mode = 1;
local_save_flags(childregs->msr);
#ifdef CONFIG_MMU
ti->cpu_context.msr = childregs->msr & ~MSR_IE;
#endif
ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8;
return 0;
}
*childregs = *regs;
if (user_mode(regs))
childregs->r1 = usp;
else
childregs->r1 = ((unsigned long) ti) + THREAD_SIZE;
childregs->r1 = usp;
#ifndef CONFIG_MMU
memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
ti->cpu_context.r1 = (unsigned long)childregs;
#ifndef CONFIG_MMU
ti->cpu_context.msr = (unsigned long)childregs->msr;
#else
childregs->msr |= MSR_UMS;
/* if creating a kernel thread then update the current reg (we don't
* want to use the parent's value when restoring by POP_STATE) */
if (kernel_mode(regs))
/* save new current on stack to use POP_STATE */
childregs->CURRENT_TASK = (unsigned long)p;
/* if returning to user then use the parent's value of this register */
/* if we're creating a new kernel thread then just zeroing all
* the registers. That's OK for a brand new thread.*/
/* Pls. note that some of them will be restored in POP_STATE */
if (kernel_mode(regs))
memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
/* if this thread is created for fork/vfork/clone, then we want to
* restore all the parent's context */
/* in addition to the registers which will be restored by POP_STATE */
else {
ti->cpu_context = *(struct cpu_context *)regs;
childregs->msr |= MSR_UMS;
}
/* FIXME STATE_SAVE_PT_OFFSET; */
ti->cpu_context.r1 = (unsigned long)childregs;
/* we should consider the fact that childregs is a copy of the parent
* regs which were saved immediately after entering the kernel state
* before enabling VM. This MSR will be restored in switch_to and
@ -209,29 +201,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
}
#endif
static void kernel_thread_helper(int (*fn)(void *), void *arg)
{
fn(arg);
do_exit(-1);
}
int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
/* store them in non-volatile registers */
regs.r5 = (unsigned long)fn;
regs.r6 = (unsigned long)arg;
local_save_flags(regs.msr);
regs.pc = (unsigned long)kernel_thread_helper;
regs.pt_mode = 1;
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
&regs, 0, NULL, NULL);
}
EXPORT_SYMBOL_GPL(kernel_thread);
unsigned long get_wchan(struct task_struct *p)
{
/* TBD (used by procfs) */
@ -246,6 +215,7 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
regs->pt_mode = 0;
#ifdef CONFIG_MMU
regs->msr |= MSR_UMS;
regs->msr &= ~MSR_VM;
#endif
}

39
arch/microblaze/kernel/sys_microblaze.c
View File

@ -48,24 +48,6 @@ asmlinkage long microblaze_clone(int flags, unsigned long stack,
return do_fork(flags, stack, regs, 0, NULL, NULL);
}
asmlinkage long microblaze_execve(const char __user *filenamei,
const char __user *const __user *argv,
const char __user *const __user *envp,
struct pt_regs *regs)
{
int error;
struct filename *filename;
filename = getname(filenamei);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
out:
return error;
}
asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, off_t pgoff)
@ -75,24 +57,3 @@ asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> PAGE_SHIFT);
}
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
register const char *__a __asm__("r5") = filename;
register const void *__b __asm__("r6") = argv;
register const void *__c __asm__("r7") = envp;
register unsigned long __syscall __asm__("r12") = __NR_execve;
register unsigned long __ret __asm__("r3");
__asm__ __volatile__ ("brki r14, 0x8"
: "=r" (__ret), "=r" (__syscall)
: "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
: "r4", "r8", "r9",
"r10", "r11", "r14", "cc", "memory");
return __ret;
}

2
arch/mips/Kconfig
View File

@ -40,6 +40,8 @@ config MIPS
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_REL
select MODULES_USE_ELF_RELA if 64BIT
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
menu "Machine selection"

2
arch/mips/include/asm/processor.h
View File

@ -310,8 +310,6 @@ struct task_struct;
/* Free all resources held by a thread. */
#define release_thread(thread) do { } while(0)
extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
extern unsigned long thread_saved_pc(struct task_struct *tsk);
/*

6
arch/mips/include/asm/ptrace.h
View File

@ -61,4 +61,10 @@ static inline void die_if_kernel(const char *str, struct pt_regs *regs)
die(str, regs);
}
#define current_pt_regs() \
({ \
unsigned long sp = (unsigned long)__builtin_frame_address(0); \
(struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
})
#endif /* _ASM_PTRACE_H */

1
arch/mips/include/asm/unistd.h
View File

@ -20,6 +20,7 @@
#define __ARCH_OMIT_COMPAT_SYS_GETDENTS64
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_SYS_ALARM
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_GETHOSTNAME
#define __ARCH_WANT_SYS_IPC
#define __ARCH_WANT_SYS_PAUSE

6
arch/mips/kernel/entry.S
View File

@ -65,6 +65,12 @@ need_resched:
b need_resched
#endif
FEXPORT(ret_from_kernel_thread)
jal schedule_tail # a0 = struct task_struct *prev
move a0, s1
jal s0
j syscall_exit
FEXPORT(ret_from_fork)
jal schedule_tail # a0 = struct task_struct *prev

21
arch/mips/kernel/linux32.c
View File

@ -3,7 +3,6 @@
*
* Copyright (C) 2000 Silicon Graphics, Inc.
* Written by Ulf Carlsson (ulfc@engr.sgi.com)
* sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@sgi.com)
*/
#include <linux/compiler.h>
#include <linux/mm.h>
@ -77,26 +76,6 @@ out:
return error;
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
{
int error;
struct filename *filename;
filename = getname(compat_ptr(regs.regs[4]));
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = compat_do_execve(filename->name, compat_ptr(regs.regs[5]),
compat_ptr(regs.regs[6]), &regs);
putname(filename);
out:
return error;
}
#define RLIM_INFINITY32 0x7fffffff
#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)

2
arch/mips/kernel/mips_ksyms.c
View File

@ -32,8 +32,6 @@ EXPORT_SYMBOL(memset);
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(memmove);
EXPORT_SYMBOL(kernel_thread);
/*
* Functions that operate on entire pages. Mostly used by memory management.
*/

62
arch/mips/kernel/process.c
View File

@ -84,6 +84,7 @@ void __noreturn cpu_idle(void)
}
asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);
void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
{
@ -113,7 +114,7 @@ void flush_thread(void)
}
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long unused, struct task_struct *p, struct pt_regs *regs)
unsigned long arg, struct task_struct *p, struct pt_regs *regs)
{
struct thread_info *ti = task_thread_info(p);
struct pt_regs *childregs;
@ -136,19 +137,30 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
childregs = (struct pt_regs *) childksp - 1;
/* Put the stack after the struct pt_regs. */
childksp = (unsigned long) childregs;
p->thread.cp0_status = read_c0_status() & ~(ST0_CU2|ST0_CU1);
if (unlikely(p->flags & PF_KTHREAD)) {
unsigned long status = p->thread.cp0_status;
memset(childregs, 0, sizeof(struct pt_regs));
ti->addr_limit = KERNEL_DS;
p->thread.reg16 = usp; /* fn */
p->thread.reg17 = arg;
p->thread.reg29 = childksp;
p->thread.reg31 = (unsigned long) ret_from_kernel_thread;
#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
status = (status & ~(ST0_KUP | ST0_IEP | ST0_IEC)) |
((status & (ST0_KUC | ST0_IEC)) << 2);
#else
status |= ST0_EXL;
#endif
childregs->cp0_status = status;
return 0;
}
*childregs = *regs;
childregs->regs[7] = 0; /* Clear error flag */
childregs->regs[2] = 0; /* Child gets zero as return value */
childregs->regs[29] = usp;
ti->addr_limit = USER_DS;
if (childregs->cp0_status & ST0_CU0) {
childregs->regs[28] = (unsigned long) ti;
childregs->regs[29] = childksp;
ti->addr_limit = KERNEL_DS;
} else {
childregs->regs[29] = usp;
ti->addr_limit = USER_DS;
}
p->thread.reg29 = (unsigned long) childregs;
p->thread.reg31 = (unsigned long) ret_from_fork;
@ -156,7 +168,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
* New tasks lose permission to use the fpu. This accelerates context
* switching for most programs since they don't use the fpu.
*/
p->thread.cp0_status = read_c0_status() & ~(ST0_CU2|ST0_CU1);
childregs->cp0_status &= ~(ST0_CU2|ST0_CU1);
#ifdef CONFIG_MIPS_MT_SMTC
@ -221,35 +232,6 @@ int dump_task_fpu(struct task_struct *t, elf_fpregset_t *fpr)
return 1;
}
/*
* Create a kernel thread
*/
static void __noreturn kernel_thread_helper(void *arg, int (*fn)(void *))
{
do_exit(fn(arg));
}
long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.regs[4] = (unsigned long) arg;
regs.regs[5] = (unsigned long) fn;
regs.cp0_epc = (unsigned long) kernel_thread_helper;
regs.cp0_status = read_c0_status();
#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
regs.cp0_status = (regs.cp0_status & ~(ST0_KUP | ST0_IEP | ST0_IEC)) |
((regs.cp0_status & (ST0_KUC | ST0_IEC)) << 2);
#else
regs.cp0_status |= ST0_EXL;
#endif
/* Ok, create the new process.. */
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
/*
*
*/

2
arch/mips/kernel/scall64-n32.S
View File

@ -167,7 +167,7 @@ EXPORT(sysn32_call_table)
PTR sys_getsockopt
PTR sys_clone /* 6055 */
PTR sys_fork
PTR sys32_execve
PTR compat_sys_execve
PTR sys_exit
PTR compat_sys_wait4
PTR sys_kill /* 6060 */

2
arch/mips/kernel/scall64-o32.S
View File

@ -203,7 +203,7 @@ sys_call_table:
PTR sys_creat
PTR sys_link
PTR sys_unlink /* 4010 */
PTR sys32_execve
PTR compat_sys_execve
PTR sys_chdir
PTR compat_sys_time
PTR sys_mknod

53
arch/mips/kernel/syscall.c
View File

@ -127,28 +127,6 @@ _sys_clone(nabi_no_regargs struct pt_regs regs)
parent_tidptr, child_tidptr);
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
{
int error;
struct filename *filename;
filename = getname((const char __user *) (long)regs.regs[4]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename->name,
(const char __user *const __user *) (long)regs.regs[5],
(const char __user *const __user *) (long)regs.regs[6],
&regs);
putname(filename);
out:
return error;
}
SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
{
struct thread_info *ti = task_thread_info(current);
@ -313,34 +291,3 @@ asmlinkage void bad_stack(void)
{
do_exit(SIGSEGV);
}
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
register unsigned long __a0 asm("$4") = (unsigned long) filename;
register unsigned long __a1 asm("$5") = (unsigned long) argv;
register unsigned long __a2 asm("$6") = (unsigned long) envp;
register unsigned long __a3 asm("$7");
unsigned long __v0;
__asm__ volatile (" \n"
" .set noreorder \n"
" li $2, %5 # __NR_execve \n"
" syscall \n"
" move %0, $2 \n"
" .set reorder \n"
: "=&r" (__v0), "=r" (__a3)
: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
: "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
"memory");
if (__a3 == 0)
return __v0;
return -__v0;
}

1
arch/mn10300/Kconfig
View File

@ -9,6 +9,7 @@ config MN10300
select HAVE_NMI_WATCHDOG if MN10300_WD_TIMER
select GENERIC_CLOCKEVENTS
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
select MODULES_USE_ELF_RELA
config AM33_2

1
arch/mn10300/include/asm/unistd.h
View File

@ -44,7 +44,6 @@
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls

7
arch/mn10300/kernel/entry.S
View File

@ -60,13 +60,8 @@ ENTRY(ret_from_kernel_thread)
mov (REG_D0,fp),d0
mov (REG_A0,fp),a0
calls (a0)
jmp sys_exit
ENTRY(ret_from_kernel_execve)
add -12,d0 /* pt_regs -> frame */
mov d0,sp
GET_THREAD_INFO a2
clr d0
mov d0,(REG_D0,fp)
jmp syscall_exit
###############################################################################

2
arch/openrisc/Kconfig
View File

@ -22,6 +22,8 @@ config OPENRISC
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
config MMU
def_bool y

2
arch/openrisc/include/uapi/asm/unistd.h
View File

@ -20,6 +20,8 @@
#define sys_mmap2 sys_mmap_pgoff
#define __ARCH_WANT_SYS_EXECVE
#include <asm-generic/unistd.h>
#define __NR_or1k_atomic __NR_arch_specific_syscall

43
arch/openrisc/kernel/entry.S
View File

@ -894,6 +894,16 @@ ENTRY(ret_from_fork)
l.jal schedule_tail
l.nop
/* Check if we are a kernel thread */
l.sfeqi r20,0
l.bf 1f
l.nop
/* ...we are a kernel thread so invoke the requested callback */
l.jalr r20
l.or r3,r22,r0
1:
/* _syscall_returns expect r11 to contain return value */
l.lwz r11,PT_GPR11(r1)
@ -915,26 +925,6 @@ ENTRY(ret_from_fork)
l.j _syscall_return
l.nop
/* Since syscalls don't save call-clobbered registers, the args to
* kernel_thread_helper will need to be passed through callee-saved
* registers and copied to the parameter registers when the thread
* begins running.
*
* See arch/openrisc/kernel/process.c:
* The args are passed as follows:
* arg1 (r3) : passed in r20
* arg2 (r4) : passed in r22
*/
ENTRY(_kernel_thread_helper)
l.or r3,r20,r0
l.or r4,r22,r0
l.movhi r31,hi(kernel_thread_helper)
l.ori r31,r31,lo(kernel_thread_helper)
l.jr r31
l.nop
/* ========================================================[ switch ] === */
/*
@ -1044,8 +1034,13 @@ ENTRY(_switch)
/* Unwind stack to pre-switch state */
l.addi r1,r1,(INT_FRAME_SIZE)
/* Return via the link-register back to where we 'came from', where that can be
* either schedule() or return_from_fork()... */
/* Return via the link-register back to where we 'came from', where
* that may be either schedule(), ret_from_fork(), or
* ret_from_kernel_thread(). If we are returning to a new thread,
* we are expected to have set up the arg to schedule_tail already,
* hence we do so here unconditionally:
*/
l.lwz r3,TI_STACK(r3) /* Load 'prev' as schedule_tail arg */
l.jr r9
l.nop
@ -1088,10 +1083,6 @@ ENTRY(sys_fork)
l.j _fork_save_extra_regs_and_call
l.addi r3,r1,0
ENTRY(sys_execve)
l.j _sys_execve
l.addi r6,r1,0
ENTRY(sys_sigaltstack)
l.j _sys_sigaltstack
l.addi r5,r1,0

165
arch/openrisc/kernel/process.c
View File

@ -109,66 +109,82 @@ void release_thread(struct task_struct *dead_task)
*/
extern asmlinkage void ret_from_fork(void);
/*
* copy_thread
* @clone_flags: flags
* @usp: user stack pointer or fn for kernel thread
* @arg: arg to fn for kernel thread; always NULL for userspace thread
* @p: the newly created task
* @regs: CPU context to copy for userspace thread; always NULL for kthread
*
* At the top of a newly initialized kernel stack are two stacked pt_reg
* structures. The first (topmost) is the userspace context of the thread.
* The second is the kernelspace context of the thread.
*
* A kernel thread will not be returning to userspace, so the topmost pt_regs
* struct can be uninitialized; it _does_ need to exist, though, because
* a kernel thread can become a userspace thread by doing a kernel_execve, in
* which case the topmost context will be initialized and used for 'returning'
* to userspace.
*
* The second pt_reg struct needs to be initialized to 'return' to
* ret_from_fork. A kernel thread will need to set r20 to the address of
* a function to call into (with arg in r22); userspace threads need to set
* r20 to NULL in which case ret_from_fork will just continue a return to
* userspace.
*
* A kernel thread 'fn' may return; this is effectively what happens when
* kernel_execve is called. In that case, the userspace pt_regs must have
* been initialized (which kernel_execve takes care of, see start_thread
* below); ret_from_fork will then continue its execution causing the
* 'kernel thread' to return to userspace as a userspace thread.
*/
int
copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long unused, struct task_struct *p, struct pt_regs *regs)
unsigned long arg, struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs;
struct pt_regs *userregs;
struct pt_regs *kregs;
unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
struct thread_info *ti;
unsigned long top_of_kernel_stack;
top_of_kernel_stack = sp;
p->set_child_tid = p->clear_child_tid = NULL;
/* Copy registers */
/* redzone */
sp -= STACK_FRAME_OVERHEAD;
/* Locate userspace context on stack... */
sp -= STACK_FRAME_OVERHEAD; /* redzone */
sp -= sizeof(struct pt_regs);
childregs = (struct pt_regs *)sp;
userregs = (struct pt_regs *) sp;
/* Copy parent registers */
*childregs = *regs;
if ((childregs->sr & SPR_SR_SM) == 1) {
/* for kernel thread, set `current_thread_info'
* and stackptr in new task
*/
childregs->sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
childregs->gpr[10] = (unsigned long)task_thread_info(p);
} else {
childregs->sp = usp;
}
childregs->gpr[11] = 0; /* Result from fork() */
/*
* The way this works is that at some point in the future
* some task will call _switch to switch to the new task.
* That will pop off the stack frame created below and start
* the new task running at ret_from_fork. The new task will
* do some house keeping and then return from the fork or clone
* system call, using the stack frame created above.
*/
/* redzone */
sp -= STACK_FRAME_OVERHEAD;
/* ...and kernel context */
sp -= STACK_FRAME_OVERHEAD; /* redzone */
sp -= sizeof(struct pt_regs);
kregs = (struct pt_regs *)sp;
ti = task_thread_info(p);
ti->ksp = sp;
if (unlikely(p->flags & PF_KTHREAD)) {
memset(kregs, 0, sizeof(struct pt_regs));
kregs->gpr[20] = usp; /* fn, kernel thread */
kregs->gpr[22] = arg;
} else {
*userregs = *regs;
/* kregs->sp must store the location of the 'pre-switch' kernel stack
* pointer... for a newly forked process, this is simply the top of
* the kernel stack.
userregs->sp = usp;
userregs->gpr[11] = 0; /* Result from fork() */
kregs->gpr[20] = 0; /* Userspace thread */
}
/*
* _switch wants the kernel stack page in pt_regs->sp so that it
* can restore it to thread_info->ksp... see _switch for details.
*/
kregs->sp = top_of_kernel_stack;
kregs->gpr[3] = (unsigned long)current; /* arg to schedule_tail */
kregs->gpr[10] = (unsigned long)task_thread_info(p);
kregs->gpr[9] = (unsigned long)ret_from_fork;
task_thread_info(p)->ksp = (unsigned long)kregs;
return 0;
}
@ -177,16 +193,14 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
*/
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
{
unsigned long sr = regs->sr & ~SPR_SR_SM;
unsigned long sr = mfspr(SPR_SR) & ~SPR_SR_SM;
set_fs(USER_DS);
memset(regs->gpr, 0, sizeof(regs->gpr));
memset(regs, 0, sizeof(struct pt_regs));
regs->pc = pc;
regs->sr = sr;
regs->sp = sp;
/* printk("start thread, ksp = %lx\n", current_thread_info()->ksp);*/
}
/* Fill in the fpu structure for a core dump. */
@ -237,74 +251,9 @@ void dump_elf_thread(elf_greg_t *dest, struct pt_regs* regs)
dest[35] = 0;
}
extern void _kernel_thread_helper(void);
void __noreturn kernel_thread_helper(int (*fn) (void *), void *arg)
{
do_exit(fn(arg));
}
/*
* Create a kernel thread.
*/
int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.gpr[20] = (unsigned long)fn;
regs.gpr[22] = (unsigned long)arg;
regs.sr = mfspr(SPR_SR);
regs.pc = (unsigned long)_kernel_thread_helper;
return do_fork(flags | CLONE_VM | CLONE_UNTRACED,
0, &regs, 0, NULL, NULL);
}
/*
* sys_execve() executes a new program.
*/
asmlinkage long _sys_execve(const char __user *name,
const char __user * const __user *argv,
const char __user * const __user *envp,
struct pt_regs *regs)
{
int error;
struct filename *filename;
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
out:
return error;
}
unsigned long get_wchan(struct task_struct *p)
{
/* TODO */
return 0;
}
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
register long __res asm("r11") = __NR_execve;
register long __a asm("r3") = (long)(filename);
register long __b asm("r4") = (long)(argv);
register long __c asm("r5") = (long)(envp);
__asm__ volatile ("l.sys 1"
: "=r" (__res), "=r"(__a), "=r"(__b), "=r"(__c)
: "0"(__res), "1"(__a), "2"(__b), "3"(__c)
: "r6", "r7", "r8", "r12", "r13", "r15",
"r17", "r19", "r21", "r23", "r25", "r27",
"r29", "r31");
__asm__ volatile ("l.nop");
return __res;
}

2
arch/parisc/Kconfig
View File

@ -22,6 +22,8 @@ config PARISC
select GENERIC_STRNCPY_FROM_USER
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
help
The PA-RISC microprocessor is designed by Hewlett-Packard and used

1
arch/parisc/include/asm/unistd.h
View File

@ -163,6 +163,7 @@ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) \
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
#endif /* __ASSEMBLY__ */

217
arch/parisc/kernel/entry.S
View File

@ -707,60 +707,10 @@ ENTRY(end_fault_vector)
.import handle_interruption,code
.import do_cpu_irq_mask,code
/*
* r26 = function to be called
* r25 = argument to pass in
* r24 = flags for do_fork()
*
* Kernel threads don't ever return, so they don't need
* a true register context. We just save away the arguments
* for copy_thread/ret_ to properly set up the child.
*/
#define CLONE_VM 0x100 /* Must agree with <linux/sched.h> */
#define CLONE_UNTRACED 0x00800000
.import do_fork
ENTRY(__kernel_thread)
STREG %r2, -RP_OFFSET(%r30)
copy %r30, %r1
ldo PT_SZ_ALGN(%r30),%r30
#ifdef CONFIG_64BIT
/* Yo, function pointers in wide mode are little structs... -PB */
ldd 24(%r26), %r2
STREG %r2, PT_GR27(%r1) /* Store childs %dp */
ldd 16(%r26), %r26
STREG %r22, PT_GR22(%r1) /* save r22 (arg5) */
copy %r0, %r22 /* user_tid */
#endif
STREG %r26, PT_GR26(%r1) /* Store function & argument for child */
STREG %r25, PT_GR25(%r1)
ldil L%CLONE_UNTRACED, %r26
ldo CLONE_VM(%r26), %r26 /* Force CLONE_VM since only init_mm */
or %r26, %r24, %r26 /* will have kernel mappings. */
ldi 1, %r25 /* stack_start, signals kernel thread */
stw %r0, -52(%r30) /* user_tid */
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
#endif
BL do_fork, %r2
copy %r1, %r24 /* pt_regs */
/* Parent Returns here */
LDREG -PT_SZ_ALGN-RP_OFFSET(%r30), %r2
ldo -PT_SZ_ALGN(%r30), %r30
bv %r0(%r2)
nop
ENDPROC(__kernel_thread)
/*
* Child Returns here
*
* copy_thread moved args from temp save area set up above
* into task save area.
* copy_thread moved args into task save area.
*/
ENTRY(ret_from_kernel_thread)
@ -769,51 +719,17 @@ ENTRY(ret_from_kernel_thread)
BL schedule_tail, %r2
nop
LDREG TI_TASK-THREAD_SZ_ALGN(%r30), %r1
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
LDREG TASK_PT_GR25(%r1), %r26
#ifdef CONFIG_64BIT
LDREG TASK_PT_GR27(%r1), %r27
LDREG TASK_PT_GR22(%r1), %r22
#endif
LDREG TASK_PT_GR26(%r1), %r1
ble 0(%sr7, %r1)
copy %r31, %r2
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
loadgp /* Thread could have been in a module */
#endif
#ifndef CONFIG_64BIT
b sys_exit
#else
load32 sys_exit, %r1
bv %r0(%r1)
#endif
ldi 0, %r26
ENDPROC(ret_from_kernel_thread)
.import sys_execve, code
ENTRY(__execve)
copy %r2, %r15
copy %r30, %r16
ldo PT_SZ_ALGN(%r30), %r30
STREG %r26, PT_GR26(%r16)
STREG %r25, PT_GR25(%r16)
STREG %r24, PT_GR24(%r16)
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
#endif
BL sys_execve, %r2
copy %r16, %r26
cmpib,=,n 0,%r28,intr_return /* forward */
/* yes, this will trap and die. */
copy %r15, %r2
copy %r16, %r30
bv %r0(%r2)
b finish_child_return
nop
ENDPROC(__execve)
ENDPROC(ret_from_kernel_thread)
/*
@ -1776,49 +1692,27 @@ ENTRY(sys_fork_wrapper)
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
ldo TASK_REGS(%r1),%r1
reg_save %r1
mfctl %cr27, %r3
STREG %r3, PT_CR27(%r1)
STREG %r2,-RP_OFFSET(%r30)
ldo FRAME_SIZE(%r30),%r30
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
#endif
/* These are call-clobbered registers and therefore
also syscall-clobbered (we hope). */
STREG %r2,PT_GR19(%r1) /* save for child */
STREG %r30,PT_GR21(%r1)
mfctl %cr27, %r28
STREG %r28, PT_CR27(%r1)
LDREG PT_GR30(%r1),%r25
copy %r1,%r24
BL sys_clone,%r2
b sys_clone
ldi SIGCHLD,%r26
LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
wrapper_exit:
ldo -FRAME_SIZE(%r30),%r30 /* get the stackframe */
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
ldo TASK_REGS(%r1),%r1 /* get pt regs */
LDREG PT_CR27(%r1), %r3
mtctl %r3, %cr27
reg_restore %r1
/* strace expects syscall # to be preserved in r20 */
ldi __NR_fork,%r20
bv %r0(%r2)
STREG %r20,PT_GR20(%r1)
ENDPROC(sys_fork_wrapper)
/* Set the return value for the child */
ENTRY(child_return)
BL schedule_tail, %r2
nop
finish_child_return:
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
ldo TASK_REGS(%r1),%r1 /* get pt regs */
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE-FRAME_SIZE(%r30), %r1
LDREG TASK_PT_GR19(%r1),%r2
b wrapper_exit
LDREG PT_CR27(%r1), %r3
mtctl %r3, %cr27
reg_restore %r1
b syscall_exit
copy %r0,%r28
ENDPROC(child_return)
@ -1827,23 +1721,10 @@ ENTRY(sys_clone_wrapper)
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
ldo TASK_REGS(%r1),%r1 /* get pt regs */
reg_save %r1
mfctl %cr27, %r3
STREG %r3, PT_CR27(%r1)
STREG %r2,-RP_OFFSET(%r30)
ldo FRAME_SIZE(%r30),%r30
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
#endif
/* WARNING - Clobbers r19 and r21, userspace must save these! */
STREG %r2,PT_GR19(%r1) /* save for child */
STREG %r30,PT_GR21(%r1)
BL sys_clone,%r2
mfctl %cr27, %r28
STREG %r28, PT_CR27(%r1)
b sys_clone
copy %r1,%r24
b wrapper_exit
LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
ENDPROC(sys_clone_wrapper)
@ -1851,72 +1732,14 @@ ENTRY(sys_vfork_wrapper)
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
ldo TASK_REGS(%r1),%r1 /* get pt regs */
reg_save %r1
mfctl %cr27, %r3
STREG %r3, PT_CR27(%r1)
mfctl %cr27, %r28
STREG %r28, PT_CR27(%r1)
STREG %r2,-RP_OFFSET(%r30)
ldo FRAME_SIZE(%r30),%r30
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
#endif
STREG %r2,PT_GR19(%r1) /* save for child */
STREG %r30,PT_GR21(%r1)
BL sys_vfork,%r2
b sys_vfork
copy %r1,%r26
b wrapper_exit
LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
ENDPROC(sys_vfork_wrapper)
.macro execve_wrapper execve
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
ldo TASK_REGS(%r1),%r1 /* get pt regs */
/*
* Do we need to save/restore r3-r18 here?
* I don't think so. why would new thread need old
* threads registers?
*/
/* %arg0 - %arg3 are already saved for us. */
STREG %r2,-RP_OFFSET(%r30)
ldo FRAME_SIZE(%r30),%r30
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
#endif
BL \execve,%r2
copy %r1,%arg0
ldo -FRAME_SIZE(%r30),%r30
LDREG -RP_OFFSET(%r30),%r2
/* If exec succeeded we need to load the args */
ldo -1024(%r0),%r1
cmpb,>>= %r28,%r1,error_\execve
copy %r2,%r19
error_\execve:
bv %r0(%r19)
nop
.endm
.import sys_execve
ENTRY(sys_execve_wrapper)
execve_wrapper sys_execve
ENDPROC(sys_execve_wrapper)
#ifdef CONFIG_64BIT
.import sys32_execve
ENTRY(sys32_execve_wrapper)
execve_wrapper sys32_execve
ENDPROC(sys32_execve_wrapper)
#endif
ENTRY(sys_rt_sigreturn_wrapper)
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26
ldo TASK_REGS(%r26),%r26 /* get pt regs */

96
arch/parisc/kernel/process.c
View File

@ -52,6 +52,7 @@
#include <asm/io.h>
#include <asm/asm-offsets.h>
#include <asm/assembly.h>
#include <asm/pdc.h>
#include <asm/pdc_chassis.h>
#include <asm/pgalloc.h>
@ -164,23 +165,6 @@ void machine_power_off(void)
void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL(pm_power_off);
/*
* Create a kernel thread
*/
extern pid_t __kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
/*
* FIXME: Once we are sure we don't need any debug here,
* kernel_thread can become a #define.
*/
return __kernel_thread(fn, arg, flags);
}
EXPORT_SYMBOL(kernel_thread);
/*
* Free current thread data structures etc..
*/
@ -256,8 +240,8 @@ sys_vfork(struct pt_regs *regs)
int
copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long unused, /* in ia64 this is "user_stack_size" */
struct task_struct * p, struct pt_regs * pregs)
unsigned long arg,
struct task_struct *p, struct pt_regs *pregs)
{
struct pt_regs * cregs = &(p->thread.regs);
void *stack = task_stack_page(p);
@ -270,48 +254,32 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
#ifdef CONFIG_HPUX
extern void * const hpux_child_return;
#endif
if (unlikely(p->flags & PF_KTHREAD)) {
memset(cregs, 0, sizeof(struct pt_regs));
if (!usp) /* idle thread */
return 0;
*cregs = *pregs;
/* Set the return value for the child. Note that this is not
actually restored by the syscall exit path, but we put it
here for consistency in case of signals. */
cregs->gr[28] = 0; /* child */
/*
* We need to differentiate between a user fork and a
* kernel fork. We can't use user_mode, because the
* the syscall path doesn't save iaoq. Right now
* We rely on the fact that kernel_thread passes
* in zero for usp.
*/
if (usp == 1) {
/* kernel thread */
cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN;
/* Must exit via ret_from_kernel_thread in order
* to call schedule_tail()
*/
cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
cregs->kpc = (unsigned long) &ret_from_kernel_thread;
/*
* Copy function and argument to be called from
* ret_from_kernel_thread.
*/
#ifdef CONFIG_64BIT
cregs->gr[27] = pregs->gr[27];
cregs->gr[27] = ((unsigned long *)usp)[3];
cregs->gr[26] = ((unsigned long *)usp)[2];
#else
cregs->gr[26] = usp;
#endif
cregs->gr[26] = pregs->gr[26];
cregs->gr[25] = pregs->gr[25];
cregs->gr[25] = arg;
} else {
/* user thread */
/*
* Note that the fork wrappers are responsible
* for setting gr[21].
*/
/* Use same stack depth as parent */
cregs->ksp = (unsigned long)stack
+ (pregs->gr[21] & (THREAD_SIZE - 1));
cregs->gr[30] = usp;
cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
if (personality(p->personality) == PER_HPUX) {
#ifdef CONFIG_HPUX
cregs->kpc = (unsigned long) &hpux_child_return;
@ -323,8 +291,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
}
/* Setup thread TLS area from the 4th parameter in clone */
if (clone_flags & CLONE_SETTLS)
cregs->cr27 = pregs->gr[23];
cregs->cr27 = pregs->gr[23];
}
return 0;
@ -335,39 +302,6 @@ unsigned long thread_saved_pc(struct task_struct *t)
return t->thread.regs.kpc;
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys_execve(struct pt_regs *regs)
{
int error;
struct filename *filename;
filename = getname((const char __user *) regs->gr[26]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename->name,
(const char __user *const __user *) regs->gr[25],
(const char __user *const __user *) regs->gr[24],
regs);
putname(filename);
out:
return error;
}
extern int __execve(const char *filename,
const char *const argv[],
const char *const envp[], struct task_struct *task);
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
return __execve(filename, argv, envp, current);
}
unsigned long
get_wchan(struct task_struct *p)
{

22
arch/parisc/kernel/sys_parisc32.c
View File

@ -53,28 +53,6 @@
#define DBG(x)
#endif
/*
* sys32_execve() executes a new program.
*/
asmlinkage int sys32_execve(struct pt_regs *regs)
{
int error;
struct filename *filename;
DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
filename = getname((const char __user *) regs->gr[26]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = compat_do_execve(filename->name, compat_ptr(regs->gr[25]),
compat_ptr(regs->gr[24]), regs);
putname(filename);
out:
return error;
}
asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
int r22, int r21, int r20)
{

2
arch/parisc/kernel/syscall_table.S
View File

@ -66,7 +66,7 @@
ENTRY_SAME(creat)
ENTRY_SAME(link)
ENTRY_SAME(unlink) /* 10 */
ENTRY_DIFF(execve_wrapper)
ENTRY_COMP(execve)
ENTRY_SAME(chdir)
/* See comments in kernel/time.c!!! Maybe we don't need this? */
ENTRY_COMP(time)

1
arch/powerpc/Kconfig
View File

@ -144,6 +144,7 @@ config PPC
select GENERIC_KERNEL_THREAD
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_EXECVE
config EARLY_PRINTK
bool

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