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Add user-space profiling support. Kernel profiling still todo.

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Obtained from:	NetBSD
This commit is contained in:
grehan 2005-12-29 04:07:36 +00:00
parent 574cde8a07
commit 50e5f6dc9b
1 changed files with 82 additions and 8 deletions
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90
sys/powerpc/include/profile.h
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@ -32,22 +32,96 @@
#ifndef _MACHINE_PROFILE_H_
#define _MACHINE_PROFILE_H_
#define _MCOUNT_DECL void mcount
#define _MCOUNT_DECL void __mcount
#define FUNCTION_ALIGNMENT 16
typedef u_int fptrdiff_t;
/*
* The mcount trampoline macro, expanded in libc/gmon/mcount.c
*
* For PowerPC SVR4 ABI profiling, the compiler will insert
* a data declaration and code sequence at the start of a routine of the form
*
* .function_mc: .data
* .align 2
* .long 0
* .text
*
* function: mflr %r0
* addis %r11,%r0, .function_mc@ha
* stw %r0,4(%r1)
* addi %r0,%r11, .function_mc@l
* bl _mcount
*
* The link register is saved in the LR save word in the caller's
* stack frame, r0 is set up to point to the allocated longword,
* and control is transferred to _mcount.
*
* On return from _mcount, the routine should function as it would
* with no profiling so _mcount must restore register state to that upon
* entry. Any routine called by the _mcount trampoline will save
* callee-save registers, so _mcount must make sure it saves volatile
* registers that may have state after it returns i.e. parameter registers.
*
* The FreeBSD libc mcount routine ignores the r0 longword pointer, but
* instead requires as parameters the current PC and called PC. The current
* PC is obtained from the link register, as a result of "bl _mcount" in
* the stub, while the caller's PC is obtained from the LR save word.
*
* On return from libc mcount, the return is done indirectly with the
* ctr register rather than the link register, to allow the link register
* to be restored to what it was on entry to the profiled routine.
*/
#ifdef PIC
#define _PLT "@plt"
#else
#define _PLT
#endif
#define MCOUNT \
void \
_mcount() \
{ \
}
__asm(" .globl _mcount \n" \
" .type _mcount,@function \n" \
"_mcount: \n" \
" stwu %r1,-64(%r1) /* alloca for reg save space */ \n" \
" stw %r3,16(%r1) /* save parameter registers, */ \n" \
" stw %r4,20(%r1) /* r3-10 */ \n" \
" stw %r5,24(%r1) \n" \
" stw %r6,28(%r1) \n" \
" stw %r7,32(%r1) \n" \
" stw %r8,36(%r1) \n" \
" stw %r9,40(%r1) \n" \
" stw %r10,44(%r1) \n" \
" \n" \
" mflr %r4 /* link register is 'selfpc' */ \n" \
" stw %r4,48(%r1) /* save since bl will scrub */ \n" \
" lwz %r3,68(%r1) /* get 'frompc' from LR-save */ \n" \
" bl __mcount" _PLT " /* __mcount(frompc, selfpc)*/ \n" \
" lwz %r3,68(%r1) \n" \
" mtlr %r3 /* restore caller's lr */ \n" \
" lwz %r4,48(%r1) \n" \
" mtctr %r4 /* set up ctr for call back */ \n" \
" /* note that blr is not used!*/ \n" \
" lwz %r3,16(%r1) /* restore r3-10 parameters */ \n" \
" lwz %r4,20(%r1) \n" \
" lwz %r5,24(%r1) \n" \
" lwz %r6,28(%r1) \n" \
" lwz %r7,32(%r1) \n" \
" lwz %r8,36(%r1) \n" \
" lwz %r9,40(%r1) \n" \
" lwz %r10,44(%r1) \n" \
" addi %r1,%r1,64 /* blow away alloca save area */ \n" \
" bctr /* return with indirect call */ \n" \
"_mcount_end: \n" \
" .size _mcount,_mcount_end-_mcount");
#ifdef _KERNEL
#define MCOUNT_ENTER(s)
#define MCOUNT_EXIT(s)
#define MCOUNT_DECL(s)
#define MCOUNT_ENTER(s) s = intr_disable();
#define MCOUNT_EXIT(s) intr_restore(s);
#define MCOUNT_DECL(s) register_t s
void bintr(void);
void btrap(void);