linux-kernel - [PATCH] i386 regparm=3 RT signal handlers on x86

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Message-Id: <20061030032617.9875.86052.sendpatchset@cube>
Date:	Sun, 29 Oct 2006 22:26:17 -0500
From:	Albert Cahalan <acahalan@...il.com>
To:	Albert Cahalan <acahalan@...il.com>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...l.org>,
	Andi Kleen <ak@...e.de>
Cc:	Albert Cahalan <acahalan@...il.com>
Subject: [PATCH] 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@...il.com>

diff -Naurd old/arch/x86_64/ia32/ia32_signal.c new/arch/x86_64/ia32/ia32_signal.c
--- old/arch/x86_64/ia32/ia32_signal.c	2006-10-29 20:36:01.000000000 -0500
+++ new/arch/x86_64/ia32/ia32_signal.c	2006-10-29 21:58:01.000000000 -0500
@@ -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)); 
 	
-
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