commit a7aacdf9ea45bf6139cfd750e558a3dcbc6f16c3
author Albert Cahalan <acahalan@gmail.com> Sun Oct 29 22:26:17 2006 -0500
committer Linus Torvalds <torvalds@g5.osdl.org> Mon Oct 30 12:12:21 2006 -0800
tree f39534927b66496a07e4804c8de277d182a30ba9
parent 202dd450246cd658e298a86dddca5592fcb898cd

[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>

arch/x86_64/ia32/ia32_signal.c

diff --git a/arch/x86_64/ia32/ia32_signal.c b/arch/x86_64/ia32/ia32_signal.c
index a6ba995..0e0a266 100644
--- a/arch/x86_64/ia32/ia32_signal.c
+++ b/arch/x86_64/ia32/ia32_signal.c
@@ -579,6 +579,11 @@
 	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));