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If you build a static ELF executable in `ld -q` mode (which leaves rela sections inside the binary) then you can run it through the elf2pe.com program afterwards, which will turn it into a PE executable. We have a new trick for defining WIN32 DLL imports in C without any assembly code. This also achieves the optimally tiny and perfect PE binary structure. We need this because it isn't possible to have a GNU ld linker script generate a PE file where the virtual pointer and the file pointer can drift apart. This post-linker can do that. One cool benefit is we can now use a smaller 512-byte alignment in the file, and an even bigger 64kb alignment for the segment virtual addresses, and the executable ends up being smaller. Another program introduced by this change is pecheck.com which can do extensive linting of PE static executables to help explain why Windows won't load it.
118 lines
4.5 KiB
C
118 lines
4.5 KiB
C
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 sw=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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#ifndef APE_IDATA_H_
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#define APE_IDATA_H_
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#ifdef __ASSEMBLER__
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#include "ape/relocations.h"
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/* clang-format off */
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// Links function from external DLL.
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//
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// This embeds a function pointer in the binary. The NT Executive
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// fills its value before control is handed off to the program.
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//
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// @note only ELF toolchains are powerful enough to use this
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// @see libc/nt/master.sh
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// @see ape/ape.lds
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// @see winimp
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.macro .imp dll:req fn:req actual:req
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#ifdef __x86_64__
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.dll "\dll"
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.section ".piro.data.sort.iat.2.\dll\().2.\actual","aw",@progbits
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.type \fn,@object
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.align __SIZEOF_POINTER__
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\fn: .quad RVA(("\dll\().\actual"))
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.size \fn,.-\fn
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.globl \fn
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.hidden \fn
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.previous
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.section ".idata.ro.ilt.\dll\().2.\actual","a",@progbits
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".Lidata.ilt.\dll\().\actual":
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.quad RVA("\dll\().\actual")
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.type ".Lidata.ilt.\dll\().\actual",@object
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.size ".Lidata.ilt.\dll\().\actual",.-".Lidata.ilt.\dll\().\actual"
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.previous
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.section ".idata.ro.hnt.\dll\().2.\actual","a",@progbits
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"\dll\().\actual":
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.short 0 // hint
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.asciz "\actual"
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.align 2 // documented requirement
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.globl "\dll\().\actual"
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.hidden "\dll\().\actual"
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.type "\dll\().\actual",@object
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.size "\dll\().\actual",.-"\dll\().\actual"
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.previous
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#else
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.section ".data.nt.\actual","aw",@progbits
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.globl "\fn"
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.balign 8
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.weak "\actual"
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"\fn": .quad "\actual"
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#endif
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.endm
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// Defines DLL import.
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// @note this is an implementation detail of .imp
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.macro .dll name:req
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.section ".idata.ro.idt.2.\name","aG",@progbits,"\name",comdat
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.equ ".Lidata.idt.\name",.
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.long RVA("idata.ilt.\name") // ImportLookupTable
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.long 0 // TimeDateStamp
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.long 0 // ForwarderChain
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.long RVA(".Lidata.str.\name") // DllNameRva
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.long RVA("idata.iat.\name") // ImportAddressTable
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.type ".Lidata.idt.\name",@object
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.size ".Lidata.idt.\name",.-".Lidata.idt.\name"
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.previous
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.section ".idata.ro.ilt.\name\().1","aG",@progbits,"\name",comdat
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.balign __SIZEOF_POINTER__
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.type "idata.ilt.\name",@object
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"idata.ilt.\name":
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.previous/*
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...
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decentralized content
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...
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*/.section ".idata.ro.ilt.\name\().3","aG",@progbits,"\name",comdat
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.quad 0
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.previous
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.section ".idata.ro.hnt.\name\().1","aG",@progbits,"\name",comdat
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.balign __SIZEOF_POINTER__
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.type "idata.hnt.\name",@object
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.equ "idata.hnt.\name",.
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.previous
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.section ".piro.data.sort.iat.2.\name\().1","awG",@progbits,"\name",comdat
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.balign __SIZEOF_POINTER__
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.type "idata.iat.\name",@object
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"idata.iat.\name":
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.previous/*
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...
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decentralized content
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...
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*/.section ".piro.data.sort.iat.2.\name\().3","awG",@progbits,"\name",comdat
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.quad 0
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.previous
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.section .rodata.str1.1,"aSM",@progbits,1
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".Lidata.str.\name":
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.asciz "\name\().dll"
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.previous
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.endm
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/* clang-format on */
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#endif /* __ASSEMBLER__ */
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#endif /* APE_IDATA_H_ */
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