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[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>
This commit is contained in:
Atsushi Nemoto 2006-08-29 12:10:22 +09:00 committed by Ralf Baechle
parent f6502791d7
commit 898d229107
1 changed files with 7 additions and 3 deletions
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10
arch/mips/kernel/traps.c
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@ -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");