86 lines
2.3 KiB
ArmAsm
86 lines
2.3 KiB
ArmAsm
/* PowerPC-specific implementation of profiling support.
|
|
Copyright (C) 1997, 1999 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
/* This would be bad. */
|
|
#ifdef PROF
|
|
#undef PROF
|
|
#endif
|
|
|
|
#include <sysdep.h>
|
|
|
|
/* We do profiling as described in the SYSV ELF ABI, _mcount is called
|
|
with the address of a data word in r0 (that is different for every
|
|
routine, initialised to 0, and otherwise unused). The caller has put
|
|
the address the caller will return to in the usual place on the stack,
|
|
4(r1). _mcount is responsible for ensuring that when it returns no
|
|
argument-passing registers are disturbed, and that the LR is set back
|
|
to (what the caller sees as) 4(r1).
|
|
|
|
This is intended so that the following code can be inserted at the
|
|
front of any routine without changing the routine:
|
|
|
|
.data
|
|
.align 2
|
|
0: .long 0
|
|
.previous
|
|
mflr r0
|
|
lis r11,0b@ha
|
|
stw r0,4(r1)
|
|
addi r0,r11,0b@l
|
|
bl _mcount
|
|
*/
|
|
|
|
ENTRY(_mcount)
|
|
stwu r1,-48(r1)
|
|
/* We need to save the parameter-passing registers. */
|
|
stw r3, 12(r1)
|
|
stw r4, 16(r1)
|
|
stw r5, 20(r1)
|
|
stw r6, 24(r1)
|
|
mflr r4
|
|
lwz r3, 52(r1)
|
|
mfcr r5
|
|
stw r7, 28(r1)
|
|
stw r8, 32(r1)
|
|
stw r9, 36(r1)
|
|
stw r10,40(r1)
|
|
stw r4, 44(r1)
|
|
stw r5, 8(r1)
|
|
bl JUMPTARGET(__mcount_internal)
|
|
nop
|
|
/* Restore the registers... */
|
|
lwz r6, 8(r1)
|
|
lwz r0, 44(r1)
|
|
lwz r3, 12(r1)
|
|
mtctr r0
|
|
lwz r4, 16(r1)
|
|
mtcrf 0xff,r6
|
|
lwz r5, 20(r1)
|
|
lwz r6, 24(r1)
|
|
lwz r0, 52(r1)
|
|
lwz r7, 28(r1)
|
|
lwz r8, 32(r1)
|
|
mtlr r0
|
|
lwz r9, 36(r1)
|
|
lwz r10,40(r1)
|
|
/* ...unwind the stack frame, and return to your usual programming. */
|
|
addi r1,r1,48
|
|
bctr
|
|
END(_mcount)
|