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121 lines
3.4 KiB
ArmAsm
121 lines
3.4 KiB
ArmAsm
/* Copyright (C) 1998-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson <rth@cygnus.com>, 1998
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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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* On Alpha we desparately want to avoid having to issue an imb. Ordinarily
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the kernel would have to issue one after setting up the signal return
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stack, but the Linux rt_sigaction syscall is prepared to accept a pointer
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to the sigreturn syscall, instead of inlining it on the stack.
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This just about halves signal delivery time. */
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.text
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ENTRY(__syscall_rt_sigaction)
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cfi_startproc
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ldgp gp,0(pv)
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#ifdef PROF
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.set noat
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lda AT, _mcount
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jsr AT, (AT), _mcount
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.set at
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#endif
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.prologue 1
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beq a1, 0f
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ldl t0, 8(a1) # sa_flags
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ldah a4, __syscall_sigreturn(gp) !gprelhigh
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ldah t1, __syscall_rt_sigreturn(gp) !gprelhigh
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lda a4, __syscall_sigreturn(a4) !gprellow
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lda t1, __syscall_rt_sigreturn(t1) !gprellow
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and t0, 0x40, t0 # SA_SIGINFO
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cmovne t0, t1, a4
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0: ldi v0, __NR_rt_sigaction
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callsys
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bne a3, SYSCALL_ERROR_LABEL
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ret
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cfi_endproc
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PSEUDO_END(__syscall_rt_sigaction)
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/* To enable unwinding through the signal frame without special hackery
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elsewhere, describe the entire struct sigcontext with unwind info.
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In order to minimize the size of the encoding, we set the CFA to the
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end of the sigcontext, which makes all of the registers have small
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negative offsets from that. */
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.macro SIGCONTEXT_REGS_I base, from=0
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cfi_offset (\from, \base + (4 + \from) * 8)
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.if 30-\from
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SIGCONTEXT_REGS_I \base, "(\from+1)"
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.endif
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.endm
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.macro SIGCONTEXT_REGS_F base, from=32
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cfi_offset (\from, \base + (4 + 1 + \from) * 8)
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.if 62-\from
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SIGCONTEXT_REGS_F \base, "(\from+1)"
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.endif
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.endm
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.macro SIGCONTEXT_REGS base
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SIGCONTEXT_REGS_I \base
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SIGCONTEXT_REGS_F \base
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cfi_offset (63, \base + (4 + 32 + 1 + 32) * 8)
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cfi_offset (64, \base + 2 * 8)
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.endm
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cfi_startproc
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cfi_return_column (64)
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.cfi_signal_frame
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SIGCONTEXT_REGS -648
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cfi_def_cfa_offset (648)
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/* While this frame is marked as a signal frame, that only applies
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to how this return address is handled for the outer frame.
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The return address that arrived here, from the inner frame, is
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not marked as a signal frame and so the unwinder still tries to
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subtract 1 to examine the presumed call insn. Thus we must
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extend the unwind info to a nop before the start. */
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nop
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.align 4
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__syscall_sigreturn:
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mov sp, a0
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ldi v0, __NR_sigreturn
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callsys
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.size __syscall_sigreturn, .-__syscall_sigreturn
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.type __syscall_sigreturn, @function
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/* See above wrt including the nop. */
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cfi_def_cfa_offset (176 + 648)
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nop
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.align 4
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__syscall_rt_sigreturn:
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mov sp,a0
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ldi v0,__NR_rt_sigreturn
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callsys
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.size __syscall_rt_sigreturn, .-__syscall_rt_sigreturn
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.type __syscall_rt_sigreturn, @function
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cfi_endproc
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