cosmopolitan/libc/runtime/setstack.S

47 lines
2.4 KiB
ArmAsm

/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi
Copyright 2020 Justine Alexandra Roberts Tunney
This program is free software; you can redistribute it and/or modify │
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License. │
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of │
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software │
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "libc/macros.h"
/ Switches stack.
/
/ @param rdi is new rsp, passed as malloc(size) + size
/ @param rsi is function to call in new stack space
/ @param rdx,rcx,r8,r9 get passed as args to rsi
/ @return rax and happens on original stack
_setstack:
push %rbp
mov %rsp,%rbp
push %rbx
mov %rsp,%rbx
mov %rdi,%rsp
push 16(%rbx)
push 8(%rbx)
mov %rsi,%rax
mov %rdx,%rdi
mov %rcx,%rsi
mov %r8,%rdx
mov %r9,%rcx
call *%rax
mov %rbx,%rsp
pop %rbx
pop %rbp
ret
.endfn _setstack,globl,hidden