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save and restore %eax, %ecx, otherwise profiling does not work properly.

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From Anon Ymous. Example program that fails:

	int
	main(int argc, char *argv[])
	{
		return argc;
	}
This commit is contained in:
christos 2007-04-16 03:49:52 +00:00
parent 6586d2040a
commit 7df3bf9f10
1 changed files with 11 additions and 3 deletions
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14
sys/arch/i386/include/profile.h
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@ -1,4 +1,4 @@
/* $NetBSD: profile.h,v 1.26 2007/02/09 21:55:05 ad Exp $ */
/* $NetBSD: profile.h,v 1.27 2007/04/16 03:49:52 christos Exp $ */
/*
* Copyright (c) 1992, 1993
@ -56,19 +56,27 @@ void \
mcount(void) \
{ \
int selfpc, frompcindex; \
int eax; \
int ecx; \
\
__asm volatile("movl %%eax,%0" : "=g" (eax)); \
__asm volatile("movl %%ecx,%0" : "=g" (ecx)); \
/* \
* find the return address for mcount, \
* and the return address for mcount's caller. \
* \
* selfpc = pc pushed by mcount call \
*/ \
__asm volatile("movl 4(%%ebp),%0" : "=r" (selfpc)); \
__asm volatile("movl 4(%%ebp),%0" : "=r" (selfpc)); \
/* \
* frompcindex = pc pushed by call into self. \
*/ \
__asm volatile("movl (%%ebp),%0;movl 4(%0),%0" \
__asm volatile("movl (%%ebp),%0;movl 4(%0),%0" \
: "=r" (frompcindex)); \
_mcount((u_long)frompcindex, (u_long)selfpc); \
\
__asm volatile("movl %0,%%ecx" : : "g" (ecx)); \
__asm volatile("movl %0,%%eax" : : "g" (eax)); \
}
#ifdef _KERNEL