mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 05:20:06 +00:00
87 lines
2.6 KiB
ArmAsm
87 lines
2.6 KiB
ArmAsm
/* Copyright (C) 1998-2023 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>
|
|
|
|
/* To enable unwinding through the signal frame without special hackery
|
|
elsewhere, describe the entire struct sigcontext with unwind info.
|
|
|
|
In order to minimize the size of the encoding, we set the CFA to the
|
|
end of the sigcontext, which makes all of the registers have small
|
|
negative offsets from that. */
|
|
|
|
.macro SIGCONTEXT_REGS_I base, from=0
|
|
cfi_offset (\from, \base + (4 + \from) * 8)
|
|
.if 30-\from
|
|
SIGCONTEXT_REGS_I \base, "(\from+1)"
|
|
.endif
|
|
.endm
|
|
|
|
.macro SIGCONTEXT_REGS_F base, from=32
|
|
cfi_offset (\from, \base + (4 + 1 + \from) * 8)
|
|
.if 62-\from
|
|
SIGCONTEXT_REGS_F \base, "(\from+1)"
|
|
.endif
|
|
.endm
|
|
|
|
.macro SIGCONTEXT_REGS base
|
|
SIGCONTEXT_REGS_I \base
|
|
SIGCONTEXT_REGS_F \base
|
|
cfi_offset (63, \base + (4 + 32 + 1 + 32) * 8)
|
|
cfi_offset (64, \base + 2 * 8)
|
|
.endm
|
|
|
|
cfi_startproc
|
|
cfi_return_column (64)
|
|
.cfi_signal_frame
|
|
SIGCONTEXT_REGS -648
|
|
cfi_def_cfa_offset (648)
|
|
|
|
/* While this frame is marked as a signal frame, that only applies
|
|
to how this return address is handled for the outer frame.
|
|
The return address that arrived here, from the inner frame, is
|
|
not marked as a signal frame and so the unwinder still tries to
|
|
subtract 1 to examine the presumed call insn. Thus we must
|
|
extend the unwind info to a nop before the start. */
|
|
nop
|
|
.align 4
|
|
|
|
__syscall_sigreturn:
|
|
mov sp, a0
|
|
ldi v0, __NR_sigreturn
|
|
callsys
|
|
.size __syscall_sigreturn, .-__syscall_sigreturn
|
|
.type __syscall_sigreturn, @function
|
|
.global __syscall_sigreturn;
|
|
.hidden __syscall_sigreturn;
|
|
|
|
/* See above wrt including the nop. */
|
|
cfi_def_cfa_offset (176 + 648)
|
|
nop
|
|
.align 4
|
|
|
|
__syscall_rt_sigreturn:
|
|
mov sp,a0
|
|
ldi v0,__NR_rt_sigreturn
|
|
callsys
|
|
.size __syscall_rt_sigreturn, .-__syscall_rt_sigreturn
|
|
.type __syscall_rt_sigreturn, @function
|
|
.global __syscall_rt_sigreturn;
|
|
.hidden __syscall_rt_sigreturn;
|
|
|
|
cfi_endproc
|