From: Bodo Stroesser <[email protected]>
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 <[email protected]>
Signed-off-by: Jeff Dike <[email protected]>
Index: linux-2.6.12-rc3-mm2/arch/um/sys-i386/stub_segv.c
===================================================================
--- linux-2.6.12-rc3-mm2.orig/arch/um/sys-i386/stub_segv.c 2005-07-27 17:22:18.000000000 -0400
+++ linux-2.6.12-rc3-mm2/arch/um/sys-i386/stub_segv.c 2005-07-28 10:35:18.000000000 -0400
@@ -21,10 +21,10 @@
__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));
}
-
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