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123 lines
3.0 KiB
ArmAsm
123 lines
3.0 KiB
ArmAsm
/* longjmp for ARM.
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Copyright (C) 1997-2024 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <pointer_guard.h>
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#include <stap-probe.h>
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#include <bits/setjmp.h>
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#include <rtld-global-offsets.h>
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#include <arm-features.h>
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/* __longjmp(jmpbuf, val) */
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ENTRY (__longjmp)
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mov ip, r0
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#ifdef CHECK_SP
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ldr r4, [ip] /* jmpbuf's sp */
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cfi_undefined (r4)
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#ifdef PTR_DEMANGLE
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PTR_DEMANGLE (r4, r4, a3, a4)
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#endif
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CHECK_SP (r4)
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#endif
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#ifdef PTR_DEMANGLE
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ldr a4, [ip], #4
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PTR_DEMANGLE (a4, a4, a3, r4)
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cfi_undefined (r4)
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ldr r4, [ip], #4
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PTR_DEMANGLE2 (r4, r4, a3)
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#else
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ldr a4, [ip], #4
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ldr r4, [ip], #4
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cfi_undefined (r4)
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#endif
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/* longjmp probe expects longjmp first argument (4@r0), second
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argument (-4@r1), and target address (4@r4), respectively. */
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LIBC_PROBE (longjmp, 3, 4@r0, -4@r1, 4@r4)
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mov sp, a4
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mov lr, r4
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ldmia ip!, JMP_BUF_REGLIST
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cfi_restore (v1)
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cfi_restore (v2)
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cfi_restore (v3)
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cfi_restore (v4)
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cfi_restore (v5)
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cfi_restore (v6)
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cfi_restore (sl)
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cfi_restore (fp)
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cfi_restore (sp)
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cfi_restore (lr)
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#if !defined ARM_ASSUME_NO_IWMMXT || defined __SOFTFP__
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# define NEED_HWCAP 1
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#endif
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#ifdef NEED_HWCAP
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# if IS_IN (rtld)
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LDST_PCREL (ldr, a4, a3, \
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C_SYMBOL_NAME(_rtld_local_ro) \
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+ RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
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# else
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# ifdef SHARED
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LDR_GLOBAL (a4, a3, C_SYMBOL_NAME(_rtld_global_ro), \
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RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
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# else
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LDR_GLOBAL (a4, a3, C_SYMBOL_NAME(_dl_hwcap), 0)
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# endif
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# endif
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#endif
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#ifdef __SOFTFP__
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tst a4, #HWCAP_ARM_VFP
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beq .Lno_vfp
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#endif
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/* Restore the VFP registers. */
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/* Following instruction is vldmia ip!, {d8-d15}. */
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ldc p11, cr8, [r12], #64
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.Lno_vfp:
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#ifndef ARM_ASSUME_NO_IWMMXT
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tst a4, #HWCAP_ARM_IWMMXT
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beq .Lno_iwmmxt
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/* Restore the call-preserved iWMMXt registers. */
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/* Following instructions are wldrd wr10, [ip], #8 (etc.) */
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ldcl p1, cr10, [r12], #8
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ldcl p1, cr11, [r12], #8
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ldcl p1, cr12, [r12], #8
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ldcl p1, cr13, [r12], #8
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ldcl p1, cr14, [r12], #8
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ldcl p1, cr15, [r12], #8
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.Lno_iwmmxt:
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#endif
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/* longjmp_target probe expects longjmp first argument (4@r0), second
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argument (-4@r1), and target address (4@r14), respectively. */
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LIBC_PROBE (longjmp_target, 3, 4@r0, -4@r1, 4@r14)
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movs r0, r1 /* get the return value in place */
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it eq
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moveq r0, #1 /* can't let setjmp() return zero! */
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DO_RET(lr)
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END (__longjmp)
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