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9057e9deee
It's wrong to pop a fixed number of words from stack before calling sigreturn, as the number depends on what code is generated by the compiler for the start of stub_segv_handler(). What we need is esp containing the address of sigcontext. So we explicitly load that pointer into esp. Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
30 lines
893 B
C
30 lines
893 B
C
/*
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* Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
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* Licensed under the GPL
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*/
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#include <signal.h>
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#include <asm/sigcontext.h>
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#include <asm/unistd.h>
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#include "uml-config.h"
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#include "sysdep/sigcontext.h"
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#include "sysdep/faultinfo.h"
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void __attribute__ ((__section__ (".__syscall_stub")))
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stub_segv_handler(int sig)
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{
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struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
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GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA),
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sc);
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__asm__("movl %0, %%eax ; int $0x80": : "g" (__NR_getpid));
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__asm__("movl %%eax, %%ebx ; movl %0, %%eax ; movl %1, %%ecx ;"
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"int $0x80": : "g" (__NR_kill), "g" (SIGUSR1));
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/* Load pointer to sigcontext into esp, since we need to leave
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* the stack in its original form when we do the sigreturn here, by
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* hand.
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*/
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__asm__("mov %0,%%esp ; movl %1, %%eax ; "
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"int $0x80" : : "a" (sc), "g" (__NR_sigreturn));
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}
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