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glibc/ports/sysdeps/alpha/bb_init_func.S
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/* Copyright (C) 1996, 1997 Free Software Foundation, Inc. | |
Contributed by David Mosberger (davidm@cs.arizona.edu). | |
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, see | |
<http://www.gnu.org/licenses/>. */ | |
/* __bb_init_func is invoked at the beginning of each function, before | |
any registers have been saved. It is therefore safe to use any | |
caller-saved (call-used) registers (except for argument registers | |
a1-a5). */ | |
#include <sysdep.h> | |
/* | |
* These offsets should match with "struct bb" declared in gcc/libgcc2.c. | |
*/ | |
#define ZERO_WORD 0x00 | |
#define NEXT 0x20 | |
.set noat | |
.set noreorder | |
ENTRY(__bb_init_func) | |
.prologue 0 | |
ldq t0, ZERO_WORD(a0) /* t0 <- blocks->zero_word */ | |
beq t0, init /* not initialized yet -> */ | |
ret | |
END(__bb_init_func) | |
.ent init | |
init: | |
.frame sp, 0x38, ra, 0 | |
subq sp, 0x38, sp | |
.prologue 0 | |
stq pv, 0x30(sp) | |
br pv, 1f | |
1: ldgp gp, 0(pv) | |
ldiq t1, __bb_head | |
lda t3, _gmonparam | |
ldq t2, 0(t1) | |
ldl t3, 0(t3) /* t3 = _gmonparam.state */ | |
lda t0, 1 | |
stq t0, ZERO_WORD(a0) /* blocks->zero_word = 1 */ | |
stq t2, NEXT(a0) /* blocks->next = __bb_head */ | |
stq a0, 0(t1) | |
bne t2, $leave | |
beq t3, $leave /* t3 == GMON_PROF_ON? yes -> */ | |
/* also need to initialize destructor: */ | |
stq ra, 0x00(sp) | |
lda a0, __bb_exit_func | |
stq a1, 0x08(sp) | |
lda pv, atexit | |
stq a2, 0x10(sp) | |
stq a3, 0x18(sp) | |
stq a4, 0x20(sp) | |
stq a5, 0x28(sp) | |
jsr ra, (pv), atexit | |
ldq ra, 0x00(sp) | |
ldq a1, 0x08(sp) | |
ldq a2, 0x10(sp) | |
ldq a3, 0x18(sp) | |
ldq a4, 0x20(sp) | |
ldq a5, 0x28(sp) | |
$leave: ldq pv, 0x30(sp) | |
addq sp, 0x38, sp | |
ret | |
.end init |