mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
e75ffde09e
You can now build Cosmopolitan with Clang:
make -j8 MODE=llvm
o/llvm/examples/hello.com
The assembler and linker code is now friendly to LLVM too.
So it's not needed to configure Clang to use binutils under
the hood. If you love LLVM then you can now use pure LLVM.
81 lines
3.2 KiB
ArmAsm
81 lines
3.2 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/macros.h"
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#include "libc/dce.h"
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#include "libc/notice.inc"
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#define INITIAL_CAPACITY 4
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// Invokes deferred function calls.
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//
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// This offers behavior similar to std::unique_ptr. Functions
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// overwrite their return addresses jumping here, and pushing
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// exactly one entry on the shadow stack below. Functions may
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// repeat that process multiple times, in which case the body
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// of this gadget loops and unwinds as a natural consequence.
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//
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// @param rax,rdx,xmm0,xmm1,st0,st1 is return value
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// @see test/libc/runtime/gc_test.c
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// <LIMBO>
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__gc: decq __garbage(%rip)
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mov __garbage(%rip),%r8
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mov __garbage+16(%rip),%r9
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js 9f
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shl $5,%r8
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lea (%r9,%r8),%r8
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mov 8(%r8),%r9
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mov 16(%r8),%rdi
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push 24(%r8)
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// </LIMBO>
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push %rbp
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mov %rsp,%rbp
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sub $0x20,%rsp
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push %rax
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push %rdx
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movdqa %xmm0,-0x20(%rbp)
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movdqa %xmm1,-0x10(%rbp)
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call *%r9
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movdqa -0x10(%rbp),%xmm1
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movdqa -0x20(%rbp),%xmm0
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pop %rdx
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pop %rax
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leave
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ret
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9: call abort
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.endfn __gc,globl,hidden
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.source __FILE__
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.bss
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.align 8
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__garbage:
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.quad 0 # garbage.i
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.quad 0 # garbage.n
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.quad 0 # garbage.p
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.rept INITIAL_CAPACITY
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.quad 0 # garbage.p[𝑖].frame
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.quad 0 # garbage.p[𝑖].fn
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.quad 0 # garbage.p[𝑖].arg
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.quad 0 # garbage.p[𝑖].ret
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.endr
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.endobj __garbage,globl,hidden
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.previous
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.init.start 100,_init_garbage
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movb $INITIAL_CAPACITY,__garbage+8(%rip)
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movl $__garbage+24,__garbage+16(%rip)
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.init.end 100,_init_garbage
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