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authorBodo Stroesser <bstroesser@fujitsu-siemens.com>2005-07-28 21:16:06 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-28 21:46:04 -0700
commit9057e9deee648cb2824d83b9eb7058edb5442a21 (patch)
tree3068f40bdee9b5bae16615b51275bdbf7b978d4a /arch
parent6f313b12335abf010802751c45249e7a0007a232 (diff)
[PATCH] uml: Fix skas0 stub return
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/um/sys-i386/stub_segv.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/um/sys-i386/stub_segv.c b/arch/um/sys-i386/stub_segv.c
index b251442ad0b..68aeabe3a65 100644
--- a/arch/um/sys-i386/stub_segv.c
+++ b/arch/um/sys-i386/stub_segv.c
@@ -21,10 +21,10 @@ stub_segv_handler(int sig)
__asm__("movl %0, %%eax ; int $0x80": : "g" (__NR_getpid));
__asm__("movl %%eax, %%ebx ; movl %0, %%eax ; movl %1, %%ecx ;"
"int $0x80": : "g" (__NR_kill), "g" (SIGUSR1));
- /* Pop the frame pointer and return address since we need to leave
+ /* Load pointer to sigcontext into esp, since we need to leave
* the stack in its original form when we do the sigreturn here, by
* hand.
*/
- __asm__("popl %%eax ; popl %%eax ; popl %%eax ; movl %0, %%eax ; "
- "int $0x80" : : "g" (__NR_sigreturn));
+ __asm__("mov %0,%%esp ; movl %1, %%eax ; "
+ "int $0x80" : : "a" (sc), "g" (__NR_sigreturn));
}