2020-06-16 13:38:43 +00:00
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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2020-06-15 14:18:57 +00:00
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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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│ 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/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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2020-06-16 02:01:28 +00:00
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.source __FILE__
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