commit 536e3ee4fed13d2d4bbf1b775174aba0cadf6aba
author Andi Kleen <ak@suse.de> Tue Sep 26 10:52:41 2006 +0200
committer Andi Kleen <andi@basil.nowhere.org> Tue Sep 26 10:52:41 2006 +0200
tree 74bd05ecdbada0e6029d0be13a2a4ec93dae0df0
parent dd54a11004b2c9a1f136225f880e021a43b0eadc

[PATCH] Initialize argument registers for 32bit signal handlers.

In case the user space was compiled with -mregparm=3
Following i386. Pointed out by Albert Cahalan

Signed-off-by: Andi Kleen <ak@suse.de>

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 2d20f83..ced1501 100644
--- a/arch/x86_64/ia32/ia32_signal.c
+++ b/arch/x86_64/ia32/ia32_signal.c
@@ -478,6 +478,11 @@
 	regs->rsp = (unsigned long) frame;
 	regs->rip = (unsigned long) ka->sa.sa_handler;
 
+	/* Make -mregparm=3 work */
+	regs->rax = sig;
+	regs->rdx = 0;
+	regs->rcx = 0;
+
 	asm volatile("movl %0,%%ds" :: "r" (__USER32_DS)); 
 	asm volatile("movl %0,%%es" :: "r" (__USER32_DS));