46 lines
2.3 KiB
ArmAsm
46 lines
2.3 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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/ Switches stack.
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/
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/ @param rdi is new rsp, passed as malloc(size) + size
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/ @param rsi is function to call in new stack space
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/ @param rdx,rcx,r8,r9 get passed as args to rsi
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/ @return rax and happens on original stack
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_setstack:
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push %rbp
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mov %rsp,%rbp
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push %rbx
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mov %rsp,%rbx
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mov %rdi,%rsp
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push 16(%rbx)
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push 8(%rbx)
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mov %rsi,%rax
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mov %rdx,%rdi
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mov %rcx,%rsi
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mov %r8,%rdx
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mov %r9,%rcx
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call *%rax
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mov %rbx,%rsp
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pop %rbx
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pop %rbp
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ret
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.endfn _setstack,globl,hidden
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