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https://github.com/followmsi/android_kernel_google_msm.git
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f355559cf7
x86_64 needs some TLS fixes. What was missing was remembering the child thread id during clone and stuffing it into the child during each context switch. The %fs value is stored separately in the thread structure since the host controls what effect it has on the actual register file. The host also needs to store it in its own thread struct, so we need the value kept outside the register file. arch_prctl_skas was fixed to call PTRACE_ARCH_PRCTL appropriately. There is some saving and restoring of registers in the ARCH_SET_* cases so that the correct set of registers are changed on the host and restored to the process when it runs again. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
/*
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* Copyright 2003 PathScale, Inc.
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*
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* Licensed under the GPL
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*/
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#include "linux/linkage.h"
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#include "linux/slab.h"
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#include "linux/shm.h"
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#include "linux/utsname.h"
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#include "linux/personality.h"
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#include "asm/uaccess.h"
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#define __FRAME_OFFSETS
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#include "asm/ptrace.h"
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#include "asm/unistd.h"
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#include "asm/prctl.h" /* XXX This should get the constants from libc */
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#include "choose-mode.h"
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#include "kern.h"
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#include "os.h"
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asmlinkage long sys_uname64(struct new_utsname __user * name)
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{
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int err;
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down_read(&uts_sem);
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err = copy_to_user(name, utsname(), sizeof (*name));
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up_read(&uts_sem);
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if (personality(current->personality) == PER_LINUX32)
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err |= copy_to_user(&name->machine, "i686", 5);
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return err ? -EFAULT : 0;
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}
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#ifdef CONFIG_MODE_TT
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extern long arch_prctl(int code, unsigned long addr);
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static long arch_prctl_tt(int code, unsigned long addr)
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{
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unsigned long tmp;
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long ret;
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switch(code){
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case ARCH_SET_GS:
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case ARCH_SET_FS:
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ret = arch_prctl(code, addr);
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break;
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case ARCH_GET_FS:
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case ARCH_GET_GS:
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ret = arch_prctl(code, (unsigned long) &tmp);
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if(!ret)
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ret = put_user(tmp, (long __user *)addr);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return(ret);
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}
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#endif
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#ifdef CONFIG_MODE_SKAS
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static long arch_prctl_skas(int code, unsigned long __user *addr)
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{
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unsigned long *ptr = addr, tmp;
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long ret;
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int pid = current->mm->context.skas.id.u.pid;
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/*
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* With ARCH_SET_FS (and ARCH_SET_GS is treated similarly to
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* be safe), we need to call arch_prctl on the host because
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* setting %fs may result in something else happening (like a
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* GDT being set instead). So, we let the host fiddle the
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* registers and restore them afterwards.
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*
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* So, the saved registers are stored to the process (this
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* needed because a stub may have been the last thing to run),
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* arch_prctl is run on the host, then the registers are read
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* back.
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*/
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switch(code){
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case ARCH_SET_FS:
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case ARCH_SET_GS:
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restore_registers(pid, ¤t->thread.regs.regs);
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break;
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case ARCH_GET_FS:
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case ARCH_GET_GS:
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/*
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* With these two, we read to a local pointer and
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* put_user it to the userspace pointer that we were
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* given. If addr isn't valid (because it hasn't been
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* faulted in or is just bogus), we want put_user to
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* fault it in (or return -EFAULT) instead of having
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* the host return -EFAULT.
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*/
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ptr = &tmp;
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}
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ret = os_arch_prctl(pid, code, ptr);
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if(ret)
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return ret;
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switch(code){
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case ARCH_SET_FS:
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case ARCH_SET_GS:
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save_registers(pid, ¤t->thread.regs.regs);
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break;
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case ARCH_GET_FS:
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ret = put_user(tmp, addr);
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break;
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case ARCH_GET_GS:
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ret = put_user(tmp, addr);
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break;
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}
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return ret;
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}
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#endif
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long sys_arch_prctl(int code, unsigned long addr)
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{
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return CHOOSE_MODE_PROC(arch_prctl_tt, arch_prctl_skas, code,
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(unsigned long __user *) addr);
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}
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long sys_clone(unsigned long clone_flags, unsigned long newsp,
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void __user *parent_tid, void __user *child_tid)
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{
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long ret;
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if (!newsp)
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newsp = UPT_SP(¤t->thread.regs.regs);
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current->thread.forking = 1;
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ret = do_fork(clone_flags, newsp, ¤t->thread.regs, 0, parent_tid,
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child_tid);
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current->thread.forking = 0;
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return ret;
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}
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void arch_switch_to_skas(struct task_struct *from, struct task_struct *to)
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{
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if(to->thread.arch.fs == 0)
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return;
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arch_prctl_skas(ARCH_SET_FS, (void __user *) to->thread.arch.fs);
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}
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