cosmopolitan/ape/idata.internal.h

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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
vi: set noet ft=asm ts=8 sw=8 fenc=utf-8 :vi
Copyright 2020 Justine Alexandra Roberts Tunney
Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted, provided that the
above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
*/
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#ifndef APE_IDATA_H_
#define APE_IDATA_H_
#ifdef __ASSEMBLER__
#include "ape/relocations.h"
/* clang-format off */
// Links function from external DLL.
//
// This embeds a function pointer in the binary. The NT Executive
// fills its value before control is handed off to the program.
//
// @note only ELF toolchains are powerful enough to use this
// @see libc/nt/master.sh
// @see ape/ape.lds
// @see winimp
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.macro .imp dll:req fn:req actual:req
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#ifdef __x86_64__
.dll "\dll"
.section ".piro.data.sort.iat.2.\dll\().2.\actual","aw",@progbits
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.type \fn,@object
.align __SIZEOF_POINTER__
\fn: .quad RVA(("\dll\().\actual"))
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.size \fn,.-\fn
.globl \fn
.hidden \fn
.previous
.section ".idata.ro.ilt.\dll\().2.\actual","a",@progbits
"idata.ilt.\dll\().\actual":
.quad RVA("\dll\().\actual")
.type "idata.ilt.\dll\().\actual",@object
.size "idata.ilt.\dll\().\actual",.-"idata.ilt.\dll\().\actual"
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.previous
.section ".idata.ro.hnt.\dll\().2.\actual","a",@progbits
"\dll\().\actual":
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.short 0 // hint
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.asciz "\actual"
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.align 2 // documented requirement
.globl "\dll\().\actual"
.hidden "\dll\().\actual"
.type "\dll\().\actual",@object
.size "\dll\().\actual",.-"\dll\().\actual"
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.previous
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#else
.section ".data.nt.\actual","aw",@progbits
.globl "\fn"
.balign 8
.weak "\actual"
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"\fn": .quad "\actual"
#endif
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.endm
// Defines DLL import.
// @note this is an implementation detail of .imp
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.macro .dll name:req
.section ".idata.ro.idt.2.\name","aG",@progbits,"\name",comdat
.equ ".Lidata.idt.\name",.
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.long RVA("idata.ilt.\name") // ImportLookupTable
.long 0 // TimeDateStamp
.long 0 // ForwarderChain
.long RVA(".Lidata.str.\name") // DllNameRva
.long RVA("idata.iat.\name") // ImportAddressTable
.type ".Lidata.idt.\name",@object
.size ".Lidata.idt.\name",.-".Lidata.idt.\name"
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.previous
.section ".idata.ro.ilt.\name\().1","aG",@progbits,"\name",comdat
.balign __SIZEOF_POINTER__
.type "idata.ilt.\name",@object
"idata.ilt.\name":
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.previous/*
...
decentralized content
...
*/.section ".idata.ro.ilt.\name\().3","aG",@progbits,"\name",comdat
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.quad 0
.previous
.section ".idata.ro.hnt.\name\().1","aG",@progbits,"\name",comdat
.balign __SIZEOF_POINTER__
.type "idata.hnt.\name",@object
.equ "idata.hnt.\name",.
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.previous
.section ".piro.data.sort.iat.2.\name\().1","awG",@progbits,"\name",comdat
.balign __SIZEOF_POINTER__
.type "idata.iat.\name",@object
"idata.iat.\name":
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.previous/*
...
decentralized content
...
*/.section ".piro.data.sort.iat.2.\name\().3","awG",@progbits,"\name",comdat
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.quad 0
.previous
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.section .rodata.str1.1,"aSM",@progbits,1
".Lidata.str.\name":
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.asciz "\name\().dll"
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.previous
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.endm
/* clang-format on */
#endif /* __ASSEMBLER__ */
#endif /* APE_IDATA_H_ */