mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 08:40:07 +00:00
90 lines
2.7 KiB
ArmAsm
90 lines
2.7 KiB
ArmAsm
/* S/390-specific implemetation of profiling support.
|
|
Copyright (C) 2000, 2001 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com)
|
|
|
|
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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
/*
|
|
* How profiling works on S/390:
|
|
* On the start of each function _mcount is called with the address of a
|
|
* data word in %r1 (initialized to 0, used for counting). The compiler
|
|
* with the option -p generates code of the form:
|
|
*
|
|
* STM 6,15,24(15)
|
|
* BRAS 13,.LTN0_0
|
|
* .LT0_0:
|
|
* .LC12: .long _mcount
|
|
* .LC13: .long .LP0
|
|
* .data
|
|
* .align 4
|
|
* .LP0: .long 0
|
|
* .text
|
|
* # function profiler
|
|
* st 14,4(15)
|
|
* l 14,.LC12-.LT0_0(13)
|
|
* l 1,.LC13-.LT0_0(13)
|
|
* basr 14,14
|
|
* l 14,4(15)
|
|
*
|
|
* The _mcount implementation now has to call __mcount_internal with the
|
|
* address of .LP0 as first parameter and the return address as second
|
|
* parameter. &.LP0 was loaded to %r1 and the return address is in %r14.
|
|
* _mcount may not modify any register.
|
|
*/
|
|
|
|
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(_mcount)
|
|
ASM_TYPE_DIRECTIVE(C_SYMBOL_NAME(_mcount), @function)
|
|
cfi_startproc
|
|
.align ALIGNARG(4)
|
|
C_LABEL(_mcount)
|
|
/* Save the caller-clobbered registers. */
|
|
ahi %r15,-128
|
|
cfi_adjust_cfa_offset (128)
|
|
stm %r14,%r5,96(%r15)
|
|
cfi_offset (r14, 0)
|
|
cfi_offset (r15, 4)
|
|
l %r2,132(%r15) # callers address = first parameter
|
|
la %r2,0(%r2) # clear bit 0
|
|
la %r3,0(%r14) # callees address = second parameter
|
|
|
|
#ifdef PIC
|
|
bras %r14,0f
|
|
.long _GLOBAL_OFFSET_TABLE_-.
|
|
0: al %r14,0(%r14)
|
|
l %r14,__mcount_internal@GOT(%r14)
|
|
#else
|
|
bras %r14,0f
|
|
.long __mcount_internal
|
|
0: l %r14,0(%r14)
|
|
#endif
|
|
basr %r14,%r14
|
|
|
|
/*
|
|
* Pop the saved registers. Please note that `mcount' has no
|
|
* return value.
|
|
*/
|
|
lm %r14,%r5,96(%r15)
|
|
ahi %r15,128
|
|
cfi_adjust_cfa_offset (-128)
|
|
br %r14
|
|
cfi_endproc
|
|
ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount))
|
|
|
|
#undef mcount
|
|
weak_alias (_mcount, mcount)
|