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[PATCH] fix i386 regparm=3 RT signal handlers on x86_64

The recent change to make x86_64 support i386 binaries compiled
with -mregparm=3 only covered signal handlers without SA_SIGINFO.
(the 3-arg "real-time" ones) This is useful for klibc at least.

Signed-off-by: Albert Cahalan <acahalan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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1 parent 202dd45 commit a7aacdf9ea45bf6139cfd750e558a3dcbc6f16c3 Albert Cahalan committed with Linus Torvalds Oct 30, 2006
Showing with 5 additions and 0 deletions.
  1. +5 −0 arch/x86_64/ia32/ia32_signal.c
@@ -579,6 +579,11 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
regs->rsp = (unsigned long) frame;
regs->rip = (unsigned long) ka->sa.sa_handler;
+ /* Make -mregparm=3 work */
+ regs->rax = sig;
+ regs->rdx = (unsigned long) &frame->info;
+ regs->rcx = (unsigned long) &frame->uc;
+
asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
asm volatile("movl %0,%%es" :: "r" (__USER32_DS));

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