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60 lines
2.2 KiB
ArmAsm
60 lines
2.2 KiB
ArmAsm
/* Copyright (C) 1991, 1993, 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <sysdep.h>
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#define _ASM 1
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#include <jmp_buf.h>
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#define ENV(reg) [%g1 + (reg * 4)]
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ENTRY (__longjmp)
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/* Store our arguments in global registers so we can still
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use them while unwinding frames and their register windows. */
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mov %o0, %g1 /* ENV in %g1 */
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orcc %o1, %g0, %g6 /* VAL in %g6 */
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be,a 0f /* Branch if zero; else skip delay slot. */
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mov 1, %g6 /* Delay slot only hit if zero: VAL = 1. */
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0:
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/* Cache target FP in register %g7. */
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ld ENV (JB_FP), %g7
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/* Now we will loop, unwinding the register windows up the stack
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until the restored %fp value matches the target value in %g7. */
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loop: cmp %fp, %g7 /* Have we reached the target frame? */
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bl,a loop /* Loop while current fp is below target. */
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restore /* Unwind register window in delay slot. */
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be,a found /* Better have hit it exactly. */
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ld ENV (JB_SP), %o0 /* Delay slot: extract target SP. */
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bogus: /* Get here only if the jmp_buf or stack is clobbered. */
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call C_SYMBOL_NAME (abort)
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nop
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unimp 0
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found: /* We have unwound register windows so %fp matches the target. */
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cmp %o0, %sp /* Check jmp_buf SP vs register window. */
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bge,a sp_ok /* Saved must not be deeper than register. */
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mov %o0, %sp /* OK, install new SP. */
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b,a bogus /* Bogus, we lose. */
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sp_ok: ld ENV (JB_PC), %o0 /* Extract target return PC. */
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jmp %o0 + 8 /* Return there. */
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mov %g6, %o0 /* Delay slot: set return value. */
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