47 lines
2.4 KiB
ArmAsm
47 lines
2.4 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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│ 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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/ 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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