85 lines
3.3 KiB
ArmAsm
85 lines
3.3 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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#include "libc/notice.inc"
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/ Applies no-clobber guarantee to System Five function call.
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/
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/ - Reentrant
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/ - Realigns stack
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/ - Doesn't assume red zone
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/ - Clobbers nothing (except %rax and flags)
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/
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/ This function may be called using an stdcall convention. It's
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/ useful for files named FOO.hookabi.c and BAR.ncabi.c to make
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/ calls into other parts of the system, that don't conform to the
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/ same restricted ABI.
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/
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/ @param six args and fn addr pushed on stack in reverse order
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/ @return %rax has function return value, and stack is cleaned up
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/ @see libc/shadowargs.hook.c for intended use case
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slowcall:
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#param %r9 # 0x40 arg6
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#param %r8 # 0x38 arg5
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#param %rcx # 0x30 arg4
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#param %rdx # 0x28 arg3
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#param %rsi # 0x20 arg2
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#param %rdi # 0x18 arg1
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#param %rax # 0x10 call address
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#param # 0x08 return address
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push %rbp # 0x00 parent frame
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mov %rsp,%rbp # ----
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push %rdi #-0x08
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push %rsi #-0x10
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push %rdx #-0x18
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push %rcx #-0x20
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push %r8 #-0x28
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push %r9 #-0x30
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push %r10 #-0x38
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push %r11 #-0x40
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mov 0x10(%rbp),%rax
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mov 0x18(%rbp),%rdi
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mov 0x20(%rbp),%rsi
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mov 0x28(%rbp),%rdx
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mov 0x30(%rbp),%rcx
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mov 0x38(%rbp),%r8
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mov 0x40(%rbp),%r9
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and $-16,%rsp
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call *%rax
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push %rax
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mov 0x00(%rbp),%rax
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mov %rax,0x38(%rbp)
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mov 0x08(%rbp),%rax
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mov %rax,0x40(%rbp)
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pop %rax
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lea -0x40(%rbp),%rsp
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pop %r11
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pop %r10
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pop %r9
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pop %r8
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pop %rcx
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pop %rdx
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pop %rsi
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pop %rdi
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lea 0x38(%rbp),%rsp
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pop %rbp
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ret
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.endfn slowcall,globl
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.source __FILE__
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