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/* longjmp for ARM.
Copyright (C) 1997-2024 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 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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <pointer_guard.h>
#include <stap-probe.h>
#include <bits/setjmp.h>
#include <rtld-global-offsets.h>
#include <arm-features.h>
/* __longjmp(jmpbuf, val) */
ENTRY (__longjmp)
mov ip, r0
#ifdef CHECK_SP
ldr r4, [ip] /* jmpbuf's sp */
cfi_undefined (r4)
#ifdef PTR_DEMANGLE
PTR_DEMANGLE (r4, r4, a3, a4)
#endif
CHECK_SP (r4)
#endif
#ifdef PTR_DEMANGLE
ldr a4, [ip], #4
PTR_DEMANGLE (a4, a4, a3, r4)
cfi_undefined (r4)
ldr r4, [ip], #4
PTR_DEMANGLE2 (r4, r4, a3)
#else
ldr a4, [ip], #4
ldr r4, [ip], #4
cfi_undefined (r4)
#endif
/* longjmp probe expects longjmp first argument (4@r0), second
argument (-4@r1), and target address (4@r4), respectively. */
LIBC_PROBE (longjmp, 3, 4@r0, -4@r1, 4@r4)
mov sp, a4
mov lr, r4
ldmia ip!, JMP_BUF_REGLIST
cfi_restore (v1)
cfi_restore (v2)
cfi_restore (v3)
cfi_restore (v4)
cfi_restore (v5)
cfi_restore (v6)
cfi_restore (sl)
cfi_restore (fp)
cfi_restore (sp)
cfi_restore (lr)
#if !defined ARM_ASSUME_NO_IWMMXT || defined __SOFTFP__
# define NEED_HWCAP 1
#endif
#ifdef NEED_HWCAP
# if IS_IN (rtld)
LDST_PCREL (ldr, a4, a3, \
C_SYMBOL_NAME(_rtld_local_ro) \
+ RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
# else
# ifdef SHARED
LDR_GLOBAL (a4, a3, C_SYMBOL_NAME(_rtld_global_ro), \
RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
# else
LDR_GLOBAL (a4, a3, C_SYMBOL_NAME(_dl_hwcap), 0)
# endif
# endif
#endif
#ifdef __SOFTFP__
tst a4, #HWCAP_ARM_VFP
beq .Lno_vfp
#endif
/* Restore the VFP registers. */
/* Following instruction is vldmia ip!, {d8-d15}. */
ldc p11, cr8, [r12], #64
.Lno_vfp:
#ifndef ARM_ASSUME_NO_IWMMXT
tst a4, #HWCAP_ARM_IWMMXT
beq .Lno_iwmmxt
/* Restore the call-preserved iWMMXt registers. */
/* Following instructions are wldrd wr10, [ip], #8 (etc.) */
ldcl p1, cr10, [r12], #8
ldcl p1, cr11, [r12], #8
ldcl p1, cr12, [r12], #8
ldcl p1, cr13, [r12], #8
ldcl p1, cr14, [r12], #8
ldcl p1, cr15, [r12], #8
.Lno_iwmmxt:
#endif
/* longjmp_target probe expects longjmp first argument (4@r0), second
argument (-4@r1), and target address (4@r14), respectively. */
LIBC_PROBE (longjmp_target, 3, 4@r0, -4@r1, 4@r14)
movs r0, r1 /* get the return value in place */
it eq
moveq r0, #1 /* can't let setjmp() return zero! */
DO_RET(lr)
END (__longjmp)
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