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https://github.com/jart/cosmopolitan.git
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01fd655097
Garbage collection will now happen on arm64 when a function returns, rather than kicking the can down the road to when the process exits. This change also does some code cleanup and incorporates suggestions
69 lines
3.1 KiB
ArmAsm
69 lines
3.1 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.internal.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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// @threadsafe
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// @noreturn
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.ftrace1
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_gclongjmp:
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.ftrace2
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#ifdef __x86_64__
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push %rbp
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mov %rsp,%rbp
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mov %fs:0,%r12 // __get_tls()
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mov 0x18(%r12),%r12 // Tls::garbages
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test %r12,%r12
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jz 0f
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movl (%r12),%r13d // garbages.i
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test %r13d,%r13d
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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 8(%r12),%r14 // garbages.p
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mov (%rdi),%r15 // jmp_buf[0] is new %rsp
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shl $5,%r13 // log2(sizeof(struct Garbage))
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1: sub $32,%r13 // 𝑖--
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js 2f
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cmp (%r14,%r13),%r15 // new %rsp > garbages.p[𝑖].frame
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jbe 2f
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mov 16(%r14,%r13),%rdi // garbages.p[𝑖].arg
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callq *8(%r14,%r13) // garbages.p[𝑖].fn
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decl (%r12) // garbages.i--
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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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#elif defined(__aarch64__)
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b longjmp
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#else
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#error "unsupported architecture"
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#endif /* __x86_64__ */
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.endfn _gclongjmp,globl
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