62 lines
2.8 KiB
ArmAsm
62 lines
2.8 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 sw=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/macros.h"
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/ Jumps up stack to previous setjmp() invocation.
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/
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/ This is the same as longjmp() but also unwinds the stack to free
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/ memory, etc. that was registered using gc() or defer(). If GC
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/ isn't linked, this behaves the same as longjmp().
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/
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/ @param rdi points to the jmp_buf which must be the same stack
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/ @param esi is returned by setjmp() invocation (coerced nonzero)
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/ @assume system five nexgen32e abi conformant
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/ @see examples/ctrlc.c
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/ @noreturn
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gclongjmp:
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.leafprologue
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.profilable
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.weak __garbage
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lea __garbage(%rip),%r12
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test %r12,%r12
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jnz .L.unwind.destructors
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0: jmp longjmp
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.L.unwind.destructors:
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push %rdi
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push %rsi
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mov (%r12),%r13 # garbage.i
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mov 16(%r12),%r14 # garbage.p
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mov (%rdi),%r15 # jmp_buf[0] is new %rsp
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shl $5,%r13
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1: test %r13,%r13
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jz 2f
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sub $32,%r13
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cmp (%r14,%r13),%r15
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ja 2f
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mov 8(%r14,%r13),%rax # garbage.p[𝑖].fn
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mov 16(%r14,%r13),%rdi # garbage.p[𝑖].arg
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call *%rax
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decq (%r12)
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jmp 1b
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2: pop %rsi
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pop %rdi
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jmp 0b
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.endfn gclongjmp,globl
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.source __FILE__
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