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At last, a version of profile.h that works properly and allows kernel 

profiling.
Define an all assembly mcount stub routine and make sure r0-r3 and lr
are preserved.
This commit is contained in:
mark 1996-10-14 22:52:49 +00:00
parent cae31931a9
commit f0137e2cc0
1 changed files with 44 additions and 8 deletions
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52
sys/arch/arm32/include/profile.h
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@ -1,4 +1,4 @@
/* $NetBSD: profile.h,v 1.3 1996/03/14 23:11:34 mark Exp $ */
/* $NetBSD: profile.h,v 1.4 1996/10/14 22:52:49 mark Exp $ */
/*
* Copyright (c) 1995-1996 Mark Brinicombe
@ -29,31 +29,67 @@
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define _MCOUNT_DECL static inline void _mcount
/*#define _MCOUNT_DECL static inline void _mcount*/
#define _MCOUNT_DECL static void _mcount
/* Cannot implement mcount in C as GCC uses the ip register to pass the
* frompcindex variable. GCC also uses ip during the register pushing
* at the beginning of any C function.
/*
* Cannot implement mcount in C as GCC will trash the ip register when it
* pushes a trapframe. Pity we cannot insert assembly before the function
* prologue.
*/
#if 0
#define MCOUNT \
extern void mcount() asm("mcount"); \
void \
mcount() \
{ \
register int selfpc, frompcindex; \
register int selfpc, frompcindex; \
/* \
* find the return address for mcount, \
* and the return address for mcount's caller. \
* \
* selfpc = pc pushed by mcount call \
*/ \
asm("mov %0, lr" : "=r" (selfpc)); \
asm("stmfd\tsp!, {r0-r3}"); \
asm("mov\t%0, lr" : "=r" (selfpc)); \
/* \
* frompcindex = pc pushed by call into self. \
*/ \
asm("mov %0, ip" : "=r" (frompcindex)); \
asm("mov\t%0, ip" : "=r" (frompcindex)); \
_mcount(frompcindex, selfpc); \
asm("ldmfd\tsp!, {r0-r3}"); \
}
#else
#define MCOUNT \
asm(".text"); \
asm(".align 0"); \
asm(".type mcount, @function"); \
asm(".global mcount"); \
asm("mcount:"); \
/* \
* Preserve registers that are trashed during mcount \
*/ \
asm("stmfd sp!, {r0-r3,lr}"); \
/* \
* find the return address for mcount, \
* and the return address for mcount's caller. \
* \
* frompcindex = pc pushed by call into self. \
*/ \
asm("mov r0, ip"); \
/* \
* selfpc = pc pushed by mcount call \
*/ \
asm("mov r1, lr"); \
/* \
* Call the real mcount code \
*/ \
asm("bl __mcount"); \
/* \
* Restore registers that were trashed during mcount \
*/ \
asm("ldmfd sp!, {r0-r3,pc}");
#endif
#ifdef _KERNEL
/*