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https://github.com/jart/cosmopolitan.git
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62 lines
2.9 KiB
ArmAsm
62 lines
2.9 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/dce.h"
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#include "libc/runtime/internal.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/macros.internal.h"
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.privileged
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// Terminates program abnormally.
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//
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// This function first tries to trigger your SIGABRT handler. If
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// there isn't one or execution resumes, then abort() terminates
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// the program using an escalating variety methods of increasing
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// brutality.
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//
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// @forcealignargpointer
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// @asyncsignalsafe
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// @noreturn
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abort: push %rbp
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mov %rsp,%rbp
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and $-16,%rsp
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sub $16,%rsp
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#if SupportsWindows()
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testb IsWindows()
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jnz sys_abort_nt
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#endif
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mov SIG_SETMASK,%edi
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mov %rsp,%rsi
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push $0xffffffffffffffdf # all bits blocked but SIGABRT
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push $0xffffffffffffffff # assumes von neum. arithmetic
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pop 8(%rsi)
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pop (%rsi)
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xor %edx,%edx # don't care about old sigmask
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pushpop 4*4,%r10 # sizeof(sigset_t) for systemd
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mov __NR_sigprocmask,%eax # sys_sigprocmask is hookable
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syscall
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mov __NR_getpid,%eax
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syscall
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mov %eax,%edi
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mov SIGABRT,%esi
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mov __NR_kill,%eax
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syscall # avoid hook and less bt noise
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call _Exit
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.endfn abort,globl,protected
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