49 lines
2.5 KiB
ArmAsm
49 lines
2.5 KiB
ArmAsm
/*-*- mode:unix-assembly; 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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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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.profilable
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and $NSIG-1,%edi
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mov g_sighandrvas(,%rdi,4),%eax
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cmp $kSigactionMinRva,%eax
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jl 2f
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lea _base(%rax),%eax
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call *%rax
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mov $1,%eax
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1: 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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