[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>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/x86_64/ia32/ia32_signal.c b/arch/x86_64/ia32/ia32_signal.c
index 2d20f8304b31..ced15012a3d7 100644
--- a/arch/x86_64/ia32/ia32_signal.c
+++ b/arch/x86_64/ia32/ia32_signal.c
@@ -478,6 +478,11 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
         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));