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Introduce post-linker that converts ELF to PE

Browse source 
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.
This commit is contained in:
Justine Tunney 2023-08-09 18:36:38 -07:00
parent 2f35bbf046
commit dd53f31147
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
18 changed files with 1914 additions and 102 deletions
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59
ape/ape.lds
View file

@ -261,7 +261,7 @@ SECTIONS {
. = ALIGN(CODE_GRANULE);
KEEP(*(.ape.pad.head))
. = ALIGN(SupportsWindows() || SupportsMetal() ? CONSTANT(COMMONPAGESIZE) : 16);
. = ALIGN(SupportsWindows() || SupportsMetal() ? CONSTANT(MAXPAGESIZE) : 16);
_ehead = .;
} :Head
@ -312,14 +312,14 @@ SECTIONS {
/* Privileged code invulnerable to magic */
KEEP(*(.ape.pad.privileged));
. = ALIGN(__privileged_end > __privileged_start ? CONSTANT(COMMONPAGESIZE) : 1);
. = ALIGN(__privileged_end > __privileged_start ? CONSTANT(MAXPAGESIZE) : 1);
/*END: morphable code */
__privileged_start = .;
*(.privileged)
__privileged_end = .;
KEEP(*(.ape.pad.text))
. = ALIGN(CONSTANT(COMMONPAGESIZE));
. = ALIGN(CONSTANT(MAXPAGESIZE));
/*END: Read Only Data (only needed for initialization) */
} :Cod
@ -349,28 +349,12 @@ SECTIONS {
KEEP(*(SORT_BY_NAME(.idata.ro.*)))
#endif
. = ALIGN(__SIZEOF_POINTER__);
__init_array_start = .;
KEEP(*(SORT_BY_INIT_PRIORITY(.init_array.*)
SORT_BY_INIT_PRIORITY(.ctors.*)))
KEEP(*(.ctors))
KEEP(*(.init_array))
KEEP(*(.preinit_array))
__init_array_end = .;
. = ALIGN(__SIZEOF_POINTER__);
__fini_array_start = .;
KEEP(*(SORT_BY_INIT_PRIORITY(.fini_array.*)
SORT_BY_INIT_PRIORITY(.dtors.*)))
KEEP(*(.fini_array))
KEEP(*(.dtors))
__fini_array_end = .;
/* Encoded Data Structures w/ Linear Initialization Order */
KEEP(*(.initroprologue))
KEEP(*(SORT_BY_NAME(.initro.*)))
KEEP(*(.initroepilogue))
KEEP(*(SORT_BY_NAME(.sort.rodata.*)))
. = ALIGN(CONSTANT(MAXPAGESIZE));
/*END: read-only data that's only needed for initialization */
@ -384,13 +368,13 @@ SECTIONS {
*(SORT_BY_ALIGNMENT(.tdata.*))
_tdata_end = .;
KEEP(*(.ape.pad.rodata))
. = ALIGN(CONSTANT(COMMONPAGESIZE));
. = ALIGN(CONSTANT(MAXPAGESIZE));
_etext = .;
PROVIDE(etext = .);
} :Tls :Rom
/*END: Read Only Data */
. = DATA_SEGMENT_ALIGN(CONSTANT(COMMONPAGESIZE), CONSTANT(COMMONPAGESIZE));
. = DATA_SEGMENT_ALIGN(CONSTANT(MAXPAGESIZE), CONSTANT(MAXPAGESIZE));
. = DATA_SEGMENT_RELRO_END(0, .);
/* this only tells the linker about the layout of uninitialized */
@ -425,6 +409,23 @@ SECTIONS {
*(.got.plt)
KEEP(*(.gotpltepilogue))
. = ALIGN(__SIZEOF_POINTER__);
__init_array_start = .;
KEEP(*(SORT_BY_INIT_PRIORITY(.init_array.*)
SORT_BY_INIT_PRIORITY(.ctors.*)))
KEEP(*(.ctors))
KEEP(*(.init_array))
KEEP(*(.preinit_array))
__init_array_end = .;
. = ALIGN(__SIZEOF_POINTER__);
__fini_array_start = .;
KEEP(*(SORT_BY_INIT_PRIORITY(.fini_array.*)
SORT_BY_INIT_PRIORITY(.dtors.*)))
KEEP(*(.fini_array))
KEEP(*(.dtors))
__fini_array_end = .;
/*BEGIN: Post-Initialization Read-Only */
. = ALIGN(__SIZEOF_POINTER__);
KEEP(*(SORT_BY_NAME(.piro.relo.sort.*)))
@ -432,7 +433,7 @@ SECTIONS {
KEEP(*(SORT_BY_NAME(.piro.data.sort.*)))
KEEP(*(.piro.pad.data))
KEEP(*(.dataepilogue))
. = ALIGN(512);
. = ALIGN(CONSTANT(MAXPAGESIZE));
/*END: NT FORK COPYING */
_edata = .;
PROVIDE(edata = .);
@ -462,7 +463,7 @@ SECTIONS {
KEEP(*(.bssepilogue))
. = ALIGN(CONSTANT(COMMONPAGESIZE));
. = ALIGN(CONSTANT(MAXPAGESIZE));
/*END: NT FORK COPYING */
_end = .;
@ -557,7 +558,7 @@ ape_cod_vaddr = ADDR(.head);
ape_cod_paddr = LOADADDR(.head);
ape_cod_filesz = SIZEOF(.head) + SIZEOF(.text);
ape_cod_memsz = ape_cod_filesz;
ape_cod_align = CONSTANT(COMMONPAGESIZE);
ape_cod_align = CONSTANT(MAXPAGESIZE);
ape_cod_rva = RVA(ape_cod_vaddr);
ape_rom_offset = ape_cod_offset + ape_cod_filesz;
@ -565,7 +566,7 @@ ape_rom_vaddr = ADDR(.rodata);
ape_rom_paddr = LOADADDR(.rodata);
ape_rom_filesz = SIZEOF(.rodata) + SIZEOF(.tdata);
ape_rom_memsz = ape_rom_filesz;
ape_rom_align = CONSTANT(COMMONPAGESIZE);
ape_rom_align = CONSTANT(MAXPAGESIZE);
ape_rom_rva = RVA(ape_rom_vaddr);
ape_ram_offset = ape_rom_offset + ape_rom_filesz;
@ -573,7 +574,7 @@ ape_ram_vaddr = ADDR(.data);
ape_ram_paddr = LOADADDR(.data);
ape_ram_filesz = SIZEOF(.data);
ape_ram_memsz = SIZEOF(.data) + SIZEOF(.bss);
ape_ram_align = CONSTANT(COMMONPAGESIZE);
ape_ram_align = CONSTANT(MAXPAGESIZE);
ape_ram_rva = RVA(ape_ram_vaddr);
ape_stack_pf = DEFINED(ape_stack_pf) ? ape_stack_pf : PF_R | PF_W;
@ -595,7 +596,7 @@ ape_text_paddr = LOADADDR(.text);
ape_text_vaddr = ADDR(.text);
ape_text_filesz = SIZEOF(.text) + SIZEOF(.rodata) + SIZEOF(.tdata);
ape_text_memsz = ape_text_filesz;
ape_text_align = CONSTANT(COMMONPAGESIZE);
ape_text_align = CONSTANT(MAXPAGESIZE);
ape_text_rva = RVA(ape_text_vaddr);
/* we roundup here because xnu wants the file load segments page-aligned */
@ -604,7 +605,7 @@ ape_text_rva = RVA(ape_text_vaddr);
SHSTUB2(ape_loader_dd_skip, DEFINED(ape_loader) ? RVA(ape_loader) / 64 : 0);
SHSTUB2(ape_loader_dd_count,
DEFINED(ape_loader_end)
? ROUNDUP(ape_loader_end - ape_loader, CONSTANT(COMMONPAGESIZE)) / 64
? ROUNDUP(ape_loader_end - ape_loader, CONSTANT(MAXPAGESIZE)) / 64
: 0);
#if defined(APE_IS_SHELL_SCRIPT) && !IsTiny()

6
ape/idata.internal.h
View file

@ -81,7 +81,7 @@
.size ".Lidata.idt.\name",.-".Lidata.idt.\name"
.previous
.section ".idata.ro.ilt.\name\().1","aG",@progbits,"\name",comdat
.align __SIZEOF_POINTER__
.balign __SIZEOF_POINTER__
.type "idata.ilt.\name",@object
"idata.ilt.\name":
.previous/*
@ -92,12 +92,12 @@
.quad 0
.previous
.section ".idata.ro.hnt.\name\().1","aG",@progbits,"\name",comdat
.align __SIZEOF_POINTER__
.balign __SIZEOF_POINTER__
.type "idata.hnt.\name",@object
.equ "idata.hnt.\name",.
.previous
.section ".piro.data.sort.iat.2.\name\().1","awG",@progbits,"\name",comdat
.align __SIZEOF_POINTER__
.balign __SIZEOF_POINTER__
.type "idata.iat.\name",@object
"idata.iat.\name":
.previous/*