mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-29 22:11:18 +00:00
60 lines
2.2 KiB
ArmAsm
60 lines
2.2 KiB
ArmAsm
/* Copyright (C) 1991, 1993, 1996 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
#define _ASM 1
|
|
#include <jmp_buf.h>
|
|
#define ENV(reg) [%g1 + (reg * 4)]
|
|
|
|
ENTRY (__longjmp)
|
|
/* Store our arguments in global registers so we can still
|
|
use them while unwinding frames and their register windows. */
|
|
mov %o0, %g1 /* ENV in %g1 */
|
|
orcc %o1, %g0, %g6 /* VAL in %g6 */
|
|
be,a 0f /* Branch if zero; else skip delay slot. */
|
|
mov 1, %g6 /* Delay slot only hit if zero: VAL = 1. */
|
|
0:
|
|
|
|
/* Cache target FP in register %g7. */
|
|
ld ENV (JB_FP), %g7
|
|
|
|
/* Now we will loop, unwinding the register windows up the stack
|
|
until the restored %fp value matches the target value in %g7. */
|
|
|
|
loop: cmp %fp, %g7 /* Have we reached the target frame? */
|
|
bl,a loop /* Loop while current fp is below target. */
|
|
restore /* Unwind register window in delay slot. */
|
|
be,a found /* Better have hit it exactly. */
|
|
ld ENV (JB_SP), %o0 /* Delay slot: extract target SP. */
|
|
|
|
bogus: /* Get here only if the jmp_buf or stack is clobbered. */
|
|
call C_SYMBOL_NAME (abort)
|
|
nop
|
|
unimp 0
|
|
|
|
found: /* We have unwound register windows so %fp matches the target. */
|
|
cmp %o0, %sp /* Check jmp_buf SP vs register window. */
|
|
bge,a sp_ok /* Saved must not be deeper than register. */
|
|
mov %o0, %sp /* OK, install new SP. */
|
|
b,a bogus /* Bogus, we lose. */
|
|
|
|
sp_ok: ld ENV (JB_PC), %o0 /* Extract target return PC. */
|
|
jmp %o0 + 8 /* Return there. */
|
|
mov %g6, %o0 /* Delay slot: set return value. */
|