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120 lines
3.5 KiB
ArmAsm
120 lines
3.5 KiB
ArmAsm
/* Copyright (C) 1997-2023 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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<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 <jmpbuf-offsets.h>
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#include <stap-probe.h>
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/* __longjmp(jmpbuf, val) */
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ENTRY (__longjmp)
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cfi_def_cfa(x0, 0)
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cfi_offset(x19, JB_X19<<3)
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cfi_offset(x20, JB_X20<<3)
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cfi_offset(x21, JB_X21<<3)
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cfi_offset(x22, JB_X22<<3)
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cfi_offset(x23, JB_X23<<3)
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cfi_offset(x24, JB_X24<<3)
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cfi_offset(x25, JB_X25<<3)
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cfi_offset(x26, JB_X26<<3)
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cfi_offset(x27, JB_X27<<3)
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cfi_offset(x28, JB_X28<<3)
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cfi_offset(x29, JB_X29<<3)
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cfi_offset(x30, JB_LR<<3)
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cfi_offset( d8, JB_D8<<3)
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cfi_offset( d9, JB_D9<<3)
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cfi_offset(d10, JB_D10<<3)
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cfi_offset(d11, JB_D11<<3)
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cfi_offset(d12, JB_D12<<3)
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cfi_offset(d13, JB_D13<<3)
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cfi_offset(d14, JB_D14<<3)
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cfi_offset(d15, JB_D15<<3)
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PTR_ARG (0)
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ldp x19, x20, [x0, #JB_X19<<3]
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ldp x21, x22, [x0, #JB_X21<<3]
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ldp x23, x24, [x0, #JB_X23<<3]
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ldp x25, x26, [x0, #JB_X25<<3]
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ldp x27, x28, [x0, #JB_X27<<3]
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#ifdef PTR_DEMANGLE
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ldp x29, x4, [x0, #JB_X29<<3]
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PTR_DEMANGLE (30, 4, 3, 2)
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#else
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ldp x29, x30, [x0, #JB_X29<<3]
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#endif
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/* longjmp probe takes 3 arguments, address of jump buffer as
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first argument (8@x0), return value as second argument (-4@x1),
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and target address (8@x30), respectively. */
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LIBC_PROBE (longjmp, 3, 8@x0, -4@x1, 8@x30)
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ldp d8, d9, [x0, #JB_D8<<3]
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ldp d10, d11, [x0, #JB_D10<<3]
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ldp d12, d13, [x0, #JB_D12<<3]
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ldp d14, d15, [x0, #JB_D14<<3]
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/* Originally this was implemented with a series of
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.cfi_restore() directives.
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The theory was that cfi_restore should revert to previous
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frame value is the same as the current value. In practice
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this doesn't work, even after cfi_restore() gdb continues
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to try to recover a previous frame value offset from x0,
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which gets stuffed after a few more instructions. The
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cfi_same_value() mechanism appears to work fine. */
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cfi_same_value(x19)
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cfi_same_value(x20)
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cfi_same_value(x21)
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cfi_same_value(x22)
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cfi_same_value(x23)
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cfi_same_value(x24)
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cfi_same_value(x25)
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cfi_same_value(x26)
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cfi_same_value(x27)
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cfi_same_value(x28)
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cfi_same_value(x29)
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cfi_same_value(x30)
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cfi_same_value(d8)
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cfi_same_value(d9)
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cfi_same_value(d10)
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cfi_same_value(d11)
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cfi_same_value(d12)
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cfi_same_value(d13)
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cfi_same_value(d14)
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cfi_same_value(d15)
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#ifdef PTR_DEMANGLE
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ldr x4, [x0, #JB_SP<<3]
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PTR_DEMANGLE (5, 4, 3, 2)
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#else
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ldr x5, [x0, #JB_SP<<3]
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#endif
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mov sp, x5
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/* longjmp_target probe takes 3 arguments, address of jump buffer
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as first argument (8@x0), return value as second argument (-4@x1),
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and target address (8@x30), respectively. */
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LIBC_PROBE (longjmp_target, 3, 8@x0, -4@x1, 8@x30)
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cmp x1, #0
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mov x0, #1
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csel x0, x1, x0, ne
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/* Use br instead of ret because ret is guaranteed to mispredict */
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br x30
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END (__longjmp)
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