|
Packit |
6c4009 |
/* 64 bit S/390-specific implementation of profiling support.
|
|
Packit |
6c4009 |
Copyright (C) 2001-2018 Free Software Foundation, Inc.
|
|
Packit |
6c4009 |
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com)
|
|
Packit |
6c4009 |
This file is part of the GNU C Library.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is free software; you can redistribute it and/or
|
|
Packit |
6c4009 |
modify it under the terms of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License as published by the Free Software Foundation; either
|
|
Packit |
6c4009 |
version 2.1 of the License, or (at your option) any later version.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
|
|
Packit |
6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit |
6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit |
6c4009 |
Lesser General Public License for more details.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
You should have received a copy of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License along with the GNU C Library; if not, see
|
|
Packit |
6c4009 |
<http://www.gnu.org/licenses/>. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#include <sysdep.h>
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* How profiling works on 64 bit S/390:
|
|
Packit |
6c4009 |
On the start of each function _mcount is called with the address of a
|
|
Packit |
6c4009 |
data word in %r1 (initialized to 0, used for counting). The compiler
|
|
Packit |
6c4009 |
with the option -p generates code of the form:
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
STM 6,15,24(15)
|
|
Packit |
6c4009 |
BRAS 13,.LTN0_0
|
|
Packit |
6c4009 |
.LT0_0:
|
|
Packit |
6c4009 |
.LC13: .long .LP0
|
|
Packit |
6c4009 |
.data
|
|
Packit |
6c4009 |
.align 4
|
|
Packit |
6c4009 |
.LP0: .long 0
|
|
Packit |
6c4009 |
.text
|
|
Packit |
6c4009 |
# function profiler
|
|
Packit |
6c4009 |
stg 14,4(15)
|
|
Packit |
6c4009 |
lg 1,.LC13-.LT0_0(13)
|
|
Packit |
6c4009 |
brasl 14,_mcount
|
|
Packit |
6c4009 |
lg 14,4(15)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The _mcount implementation now has to call __mcount_internal with the
|
|
Packit |
6c4009 |
address of .LP0 as first parameter and the return address as second
|
|
Packit |
6c4009 |
parameter. &.LP0 was loaded to %r1 and the return address is in %r14.
|
|
Packit |
6c4009 |
_mcount may not modify any register. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
.globl C_SYMBOL_NAME(_mcount)
|
|
Packit |
6c4009 |
.type C_SYMBOL_NAME(_mcount), @function
|
|
Packit |
6c4009 |
cfi_startproc
|
|
Packit |
6c4009 |
.align ALIGNARG(4)
|
|
Packit |
6c4009 |
C_LABEL(_mcount)
|
|
Packit |
6c4009 |
/* Save the caller-clobbered registers. */
|
|
Packit |
6c4009 |
aghi %r15,-224
|
|
Packit |
6c4009 |
cfi_adjust_cfa_offset (224)
|
|
Packit |
6c4009 |
stmg %r14,%r5,160(%r15)
|
|
Packit |
6c4009 |
cfi_offset (r14, 0)
|
|
Packit |
6c4009 |
cfi_offset (r15, 8)
|
|
Packit |
6c4009 |
lg %r2,232(%r15) # callers address = first parameter
|
|
Packit |
6c4009 |
la %r2,0(%r2) # clear bit 0
|
|
Packit |
6c4009 |
la %r3,0(%r14) # callees address = second parameter
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#ifdef PIC
|
|
Packit |
6c4009 |
brasl %r14,__mcount_internal@PLT
|
|
Packit |
6c4009 |
#else
|
|
Packit |
6c4009 |
brasl %r14,__mcount_internal
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Pop the saved registers. Please note that `mcount' has no
|
|
Packit |
6c4009 |
return value. */
|
|
Packit |
6c4009 |
lmg %r14,%r5,160(%r15)
|
|
Packit |
6c4009 |
aghi %r15,224
|
|
Packit |
6c4009 |
cfi_adjust_cfa_offset (-224)
|
|
Packit |
6c4009 |
br %r14
|
|
Packit |
6c4009 |
cfi_endproc
|
|
Packit |
6c4009 |
ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount))
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#undef mcount
|
|
Packit |
6c4009 |
weak_alias (_mcount, mcount)
|