From 898d229107f7aa8ea45685c11e2930783755f9ba Mon Sep 17 00:00:00 2001
From: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Date: Tue, 29 Aug 2006 12:10:22 +0900
Subject: [PATCH] [MIPS] Make prepare_frametrace() not clobber v0
Since lmo commit 323a380bf9e1a1679a774a2b053e3c1f2aa3f179 ("Simplify
dump_stack()") made prepare_frametrace() always inlined, using $2 (v0)
in __asm__ is not safe anymore. We can use $1 (at) instead. Also we
should use "dla" instead of "la" for 64-bit kernel.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
arch/mips/kernel/traps.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index ab77034921c4..e51d8fd9a152 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -161,16 +161,20 @@ static void show_stacktrace(struct task_struct *task, struct pt_regs *regs)
static __always_inline void prepare_frametrace(struct pt_regs *regs)
{
__asm__ __volatile__(
- "1: la $2, 1b\n\t"
+ ".set push\n\t"
+ ".set noat\n\t"
#ifdef CONFIG_64BIT
- "sd $2, %0\n\t"
+ "1: dla $1, 1b\n\t"
+ "sd $1, %0\n\t"
"sd $29, %1\n\t"
"sd $31, %2\n\t"
#else
- "sw $2, %0\n\t"
+ "1: la $1, 1b\n\t"
+ "sw $1, %0\n\t"
"sw $29, %1\n\t"
"sw $31, %2\n\t"
#endif
+ ".set pop\n\t"
: "=m" (regs->cp0_epc),
"=m" (regs->regs[29]), "=m" (regs->regs[31])
: : "memory");
--
2.34.1