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< * $FreeBSD: head/sys/powerpc/include/profile.h 147298 2005-06-11 10:59:02Z jkoshy $
---
> * $FreeBSD: head/sys/powerpc/include/profile.h 153813 2005-12-29 04:07:36Z grehan $
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< #define _MCOUNT_DECL void mcount
---
> #define _MCOUNT_DECL void __mcount
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> /*
> * 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
>
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< 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");
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>
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< #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