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47 lines
1.5 KiB
ArmAsm
47 lines
1.5 KiB
ArmAsm
/* _Unwind_Resume wrapper for ARM EABI.
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Copyright (C) 2015-2019 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 License as
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published by the Free Software Foundation; either version 2.1 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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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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* This is just implementing exactly what the C version does.
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We do it in assembly just to ensure that we get an unmolested tail
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call to the libgcc function, which is necessary for the ARM unwinder. */
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ENTRY (_Unwind_Resume)
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LDR_HIDDEN (ip, ip, __libgcc_s_resume, 0)
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cmp ip, #0
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beq 1f
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0: PTR_DEMANGLE (ip, ip, r2, r3)
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bx ip
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/* We need to save and restore LR (for our own return address)
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and R0 (for the argument to _Unwind_Resume) around the call. */
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1: push {r0, lr}
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cfi_adjust_cfa_offset (8)
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cfi_rel_offset (r0, 0)
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cfi_rel_offset (lr, 4)
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bl __libgcc_s_init
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pop {r0, lr}
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cfi_adjust_cfa_offset (-8)
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cfi_restore (r0)
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cfi_restore (lr)
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LDR_HIDDEN (ip, ip, __libgcc_s_resume, 0)
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b 0b
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END (_Unwind_Resume)
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