From: Andi Kleen <ak@suse.de>
Date: Tue, 26 Sep 2006 08:52:41 +0000 (+0200)
Subject: [PATCH] Initialize argument registers for 32bit signal handlers.
X-Git-Tag: firefly_0821_release~33451^2~13
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=536e3ee4fed13d2d4bbf1b775174aba0cadf6aba;p=firefly-linux-kernel-4.4.55.git

[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>
---

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));