/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│ │vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│ ╞══════════════════════════════════════════════════════════════════════════════╡ │ Copyright 2020 Justine Alexandra Roberts Tunney │ │ │ │ Permission to use, copy, modify, and/or distribute this software for │ │ any purpose with or without fee is hereby granted, provided that the │ │ above copyright notice and this permission notice appear in all copies. │ │ │ │ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │ │ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │ │ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │ │ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │ │ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │ │ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │ │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │ │ PERFORMANCE OF THIS SOFTWARE. │ ╚─────────────────────────────────────────────────────────────────────────────*/ #include "libc/macros.internal.h" // Jumps up stack to previous setjmp() invocation. // // This is the same as longjmp() but also unwinds the stack to free // memory, etc. that was registered using gc() or defer(). If GC // isn't linked, this behaves the same as longjmp(). // // @param rdi points to the jmp_buf which must be the same stack // @param esi is returned by setjmp() invocation (coerced nonzero) // @assume system five nexgen32e abi conformant // @see examples/ctrlc.c // @threadsafe // @noreturn _gclongjmp: push %rbp mov %rsp,%rbp .profilable mov %fs:0,%r12 # __get_tls() mov 0x18(%r12),%r12 # Tls::garbages test %r12,%r12 jz 0f movl (%r12),%r13d # garbages.i test %r13d,%r13d jnz .L.unwind.destructors 0: jmp longjmp .L.unwind.destructors: push %rdi push %rsi mov 8(%r12),%r14 # garbages.p mov (%rdi),%r15 # jmp_buf[0] is new %rsp shl $5,%r13 # log2(sizeof(struct Garbage)) 1: sub $32,%r13 # 𝑖-- js 2f cmp (%r14,%r13),%r15 # new %rsp > garbages.p[𝑖].frame jbe 2f mov 16(%r14,%r13),%rdi # garbages.p[𝑖].arg callq *8(%r14,%r13) # garbages.p[𝑖].fn decl (%r12) # garbages.i-- jmp 1b 2: pop %rsi pop %rdi jmp 0b .endfn _gclongjmp,globl