55 lines
2.6 KiB
ArmAsm
55 lines
2.6 KiB
ArmAsm
/*-*- mode:asm; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ 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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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/internal.h"
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#include "libc/macros.h"
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.source __FILE__
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/ System Five signal handler.
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/
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/ This is needed because (1) a signal is allowed to trigger at
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/ just about any time, and leaf functions (e.g. memcpy) aren't
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/ required to leave Cosmopolitan's image base register alone.
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/
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/ @param %edi is the signal number
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/ @param %rsi will be passed for sigactions
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/ @param %rdx will be passed for sigactions
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/ @return true if handler was invoked
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__sigenter:
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push %rbp
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mov %rsp,%rbp
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push %rbx
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push %rbx
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ezlea _base,bx
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.profilable
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ezlea g_sighandrvas,ax
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and $NSIG-1,%edi
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mov (%rax,%rdi,4),%eax
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cmp $kSigactionMinRva,%eax
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jl 2f
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add %rbx,%rax
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call *%rax
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mov $1,%eax
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1: pop %rbx
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leave
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ret
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2: xor %eax,%eax
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jmp 1b
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.endfn __sigenter,globl,hidden
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