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- /* Copyright (C) 1997-2016 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
- <http://www.gnu.org/licenses/>. */
- #include <sysdep.h>
- #include <jmpbuf-offsets.h>
- /* __longjmp(jmpbuf, val) */
- ENTRY (__longjmp)
- cfi_def_cfa(x0, 0)
- cfi_offset(x19, JB_X19<<3)
- cfi_offset(x20, JB_X20<<3)
- cfi_offset(x21, JB_X21<<3)
- cfi_offset(x22, JB_X22<<3)
- cfi_offset(x23, JB_X23<<3)
- cfi_offset(x24, JB_X24<<3)
- cfi_offset(x25, JB_X25<<3)
- cfi_offset(x26, JB_X26<<3)
- cfi_offset(x27, JB_X27<<3)
- cfi_offset(x28, JB_X28<<3)
- cfi_offset(x29, JB_X29<<3)
- cfi_offset(x30, JB_LR<<3)
- cfi_offset( d8, JB_D8<<3)
- cfi_offset( d9, JB_D9<<3)
- cfi_offset(d10, JB_D10<<3)
- cfi_offset(d11, JB_D11<<3)
- cfi_offset(d12, JB_D12<<3)
- cfi_offset(d13, JB_D13<<3)
- cfi_offset(d14, JB_D14<<3)
- cfi_offset(d15, JB_D15<<3)
- ldp x19, x20, [x0, #JB_X19<<3]
- ldp x21, x22, [x0, #JB_X21<<3]
- ldp x23, x24, [x0, #JB_X23<<3]
- ldp x25, x26, [x0, #JB_X25<<3]
- ldp x27, x28, [x0, #JB_X27<<3]
- ldp x29, x30, [x0, #JB_X29<<3]
- /* longjmp probe takes 3 arguments, address of jump buffer as
- first argument (8@x0), return value as second argument (-4@x1),
- and target address (8@x30), respectively. */
- //LIBC_PROBE (longjmp, 3, 8@x0, -4@x1, 8@x30)
- ldp d8, d9, [x0, #JB_D8<<3]
- ldp d10, d11, [x0, #JB_D10<<3]
- ldp d12, d13, [x0, #JB_D12<<3]
- ldp d14, d15, [x0, #JB_D14<<3]
- /* Originally this was implemented with a series of
- .cfi_restore() directives.
- The theory was that cfi_restore should revert to previous
- frame value is the same as the current value. In practice
- this doesn't work, even after cfi_restore() gdb continues
- to try to recover a previous frame value offset from x0,
- which gets stuffed after a few more instructions. The
- cfi_same_value() mechanism appears to work fine. */
- cfi_same_value(x19)
- cfi_same_value(x20)
- cfi_same_value(x21)
- cfi_same_value(x22)
- cfi_same_value(x23)
- cfi_same_value(x24)
- cfi_same_value(x25)
- cfi_same_value(x26)
- cfi_same_value(x27)
- cfi_same_value(x28)
- cfi_same_value(x29)
- cfi_same_value(x30)
- cfi_same_value(d8)
- cfi_same_value(d9)
- cfi_same_value(d10)
- cfi_same_value(d11)
- cfi_same_value(d12)
- cfi_same_value(d13)
- cfi_same_value(d14)
- cfi_same_value(d15)
- ldr x5, [x0, #JB_SP<<3]
- mov sp, x5
- /* longjmp_target probe takes 3 arguments, address of jump buffer
- as first argument (8@x0), return value as second argument (-4@x1),
- and target address (8@x30), respectively. */
- //LIBC_PROBE (longjmp_target, 3, 8@x0, -4@x1, 8@x30)
- cmp x1, #0
- mov x0, #1
- csel x0, x1, x0, ne
- /* Use br instead of ret because ret is guaranteed to mispredict */
- br x30
- END (__longjmp)
- libc_hidden_def(__longjmp)
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