| /* Copyright (C) 1998-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Richard Henderson <rth@cygnus.com>, 1998 |
| |
| 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> |
| |
| /* On Alpha we desparately want to avoid having to issue an imb. Ordinarily |
| the kernel would have to issue one after setting up the signal return |
| stack, but the Linux rt_sigaction syscall is prepared to accept a pointer |
| to the sigreturn syscall, instead of inlining it on the stack. |
| |
| This just about halves signal delivery time. */ |
| |
| .text |
| |
| ENTRY(__syscall_rt_sigaction) |
| cfi_startproc |
| ldgp gp,0(pv) |
| #ifdef PROF |
| .set noat |
| lda AT, _mcount |
| jsr AT, (AT), _mcount |
| .set at |
| #endif |
| .prologue 1 |
| |
| beq a1, 0f |
| ldl t0, 8(a1) # sa_flags |
| |
| ldah a4, __syscall_sigreturn(gp) !gprelhigh |
| ldah t1, __syscall_rt_sigreturn(gp) !gprelhigh |
| lda a4, __syscall_sigreturn(a4) !gprellow |
| lda t1, __syscall_rt_sigreturn(t1) !gprellow |
| and t0, 0x40, t0 # SA_SIGINFO |
| cmovne t0, t1, a4 |
| |
| 0: ldi v0, __NR_rt_sigaction |
| callsys |
| bne a3, SYSCALL_ERROR_LABEL |
| ret |
| cfi_endproc |
| PSEUDO_END(__syscall_rt_sigaction) |
| |
| /* 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 |
| |
| /* 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 |
| |
| cfi_endproc |
