mirror of
https://github.com/jart/cosmopolitan.git
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Improve dead code elimination
This commit is contained in:
Justine Tunney
parent
760db8c5ad
commit
0e36cb3ac4
6606 changed files with 9685 additions and 9854 deletions
215
libc/elf/elf.lds
215
libc/elf/elf.lds
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@ -1,215 +0,0 @@
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/*-*- mode: ld-script; indent-tabs-mode: nil; tab-width: 2; coding: utf-8 -*-│
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│vi: set et sts=2 tw=2 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 "ape/relocations.h"
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#include "libc/macros.h"
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/**
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* @fileoverview Cosmopolitan ELF-Normative Linker Script.
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*
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* This linker script is an alternative to αcτµαlly pδrταblε εxεcµταblε.
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* It's intended for host-only binaries that don't need to be able to run
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* without an operating system, and don't need to be distributed. These
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* are still static executables, and they start at roughly 1kb in size.
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*
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* @see ape/ape.lds
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*/
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ENTRY(_start)
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SECTIONS {
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. = SEGMENT_START("text-segment", IMAGE_BASE_VIRTUAL) + SIZEOF_HEADERS;
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.real : {
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HIDDEN(_base = .);
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*(.text.real)
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HIDDEN(_ereal = .);
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}
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.start : {
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*(.start)
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KEEP(*(.initprologue))
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KEEP(*(SORT_BY_NAME(.init.*)))
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KEEP(*(SORT_NONE(.init)))
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KEEP(*(.initepilogue))
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*(.text.startup)
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}
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.exit : {
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*(.text.exit)
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}
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.cold : {
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*(.text.unlikely)
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}
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.windows : {
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*(.textwindowsprologue)
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*(.text.windows) /* ← you can flip the windows bit in -DSUPPORT_VECTOR */
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*(.textwindowsepilogue)
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}
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.text : {
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*(SORT_BY_ALIGNMENT(.text.hot))
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KEEP(*(.keep.text))
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*(.text .text.*)
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KEEP(*(SORT_BY_NAME(.sort.text.*)))
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}
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.test : {
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HIDDEN(__test_start = .);
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*(.test.unlikely)
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*(.test .test.*)
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}
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.privileged : {
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. = ALIGN(DEFINED(ftrace_init) ? PAGESIZE : 1);
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HIDDEN(__privileged_start = .);
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*(.privileged)
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HIDDEN(__privileged_end = .);
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}
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.rodata : {
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HIDDEN(__ro = .); /* ←for gdb readibility */
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/* Read-Only Data */
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*(.rodata .rodata.*)
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KEEP(*(SORT_BY_NAME(.sort.rodata.*)))
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/* DSO stuff */
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PROVIDE_HIDDEN(__got_plt = .);
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*(.got.plt)
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/* Windows DLL Import Directory */
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HIDDEN(idata.ro = .);
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KEEP(*(SORT_BY_NAME(.idata.ro.*)))
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}
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.initro : {
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/* Encoded Data Structures */
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KEEP(*(.initroprologue))
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KEEP(*(SORT_BY_NAME(.initro.*)))
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KEEP(*(.initroepilogue))
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}
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.ubsan : {
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/* Undefined Behavior Sanitizer Types */
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PROVIDE_HIDDEN(__ubsan_types_start = .);
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*(.ubsan.types)
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PROVIDE_HIDDEN(__ubsan_types_end = .);
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PROVIDE_HIDDEN(__ubsan_data_start = .);
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*(.ubsan.data)
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PROVIDE_HIDDEN(__ubsan_data_end = .);
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}
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HIDDEN(_etext = .);
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PROVIDE_HIDDEN(etext = .);
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. = DATA_SEGMENT_ALIGN(CONSTANT(MAXPAGESIZE), CONSTANT(COMMONPAGESIZE));
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.data : {
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*(.data .data.*)
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KEEP(*(SORT_BY_NAME(.sort.data.*)))
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SORT(CONSTRUCTORS)
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KEEP(*(.edata))
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. = ALIGN(__SIZEOF_POINTER__);
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HIDDEN(__piro_start = .);
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QUAD(IMAGE_BASE_VIRTUAL);
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PROVIDE_HIDDEN(__init_array_start = .);
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KEEP(*(.preinit_array))
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KEEP(*(SORT_BY_INIT_PRIORITY(.init_array.*)
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SORT_BY_INIT_PRIORITY(.ctors.*)))
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KEEP(*(SORT_NONE(.init_array)))
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KEEP(*(SORT_NONE(.ctors)))
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PROVIDE_HIDDEN(__init_array_end = .);
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PROVIDE_HIDDEN(__fini_array_start = .);
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KEEP(*(SORT_BY_INIT_PRIORITY(.fini_array.*)
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SORT_BY_INIT_PRIORITY(.dtors.*)))
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KEEP(*(SORT_NONE(.fini_array)))
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KEEP(*(SORT_NONE(.dtors)))
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PROVIDE_HIDDEN(__fini_array_end = .);
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KEEP(*(SORT_BY_NAME(.piro.relo.sort.*)))
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*(.data.rel.ro .data.rel.ro.*)
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PROVIDE_HIDDEN(__relo_end = .);
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KEEP(*(SORT_BY_NAME(.piro.data.sort.*)))
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}
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HIDDEN(_edata = .);
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PROVIDE_HIDDEN(edata = .);
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.bss : {
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KEEP(*(SORT_BY_NAME(.piro.bss.init.*)))
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*(.piro.bss)
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KEEP(*(SORT_BY_NAME(.piro.bss.sort.*)))
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HIDDEN(__piro_end = .);
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*(.bss .bss.*)
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*(COMMON)
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KEEP(*(SORT_BY_NAME(.sort.bss.*)))
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. = ALIGN(ABSOLUTE(.) - IMAGE_BASE_VIRTUAL > 0x80000000 ? 0x80000000 :
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ABSOLUTE(.) - IMAGE_BASE_VIRTUAL > 0x200000 ? 0x200000 : 0x1000);
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*(.xlm)
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. = ALIGN(ABSOLUTE(.) - IMAGE_BASE_VIRTUAL > 0x80000000 ? 0x80000000 :
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ABSOLUTE(.) - IMAGE_BASE_VIRTUAL > 0x200000 ? 0x200000 : 0x1000);
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. = ALIGN(. != 0 ? __SIZEOF_POINTER__ : 1);
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}
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HIDDEN(_end = .);
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PROVIDE_HIDDEN(end = .);
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.gnu_debuglink 0 : { *(.gnu_debuglink) }
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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.stab.excl 0 : { *(.stab.excl) }
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.stab.exclstr 0 : { *(.stab.exclstr) }
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.stab.index 0 : { *(.stab.index) }
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.stab.indexstr 0 : { *(.stab.indexstr) }
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.debug 0 : { *(.debug) }
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.line 0 : { *(.line) }
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.debug_srcinfo 0 : { *(.debug_srcinfo) }
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.debug_sfnames 0 : { *(.debug_sfnames) }
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.debug_aranges 0 : { *(.debug_aranges) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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.debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_line 0 : { *(.debug_line .debug_line.* .debug_line_end ) }
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.debug_frame 0 : { *(.debug_frame) }
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.debug_str 0 : { *(.debug_str) }
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.debug_loc 0 : { *(.debug_loc) }
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.debug_macinfo 0 : { *(.debug_macinfo) }
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.debug_weaknames 0 : { *(.debug_weaknames) }
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.debug_funcnames 0 : { *(.debug_funcnames) }
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.debug_typenames 0 : { *(.debug_typenames) }
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.debug_varnames 0 : { *(.debug_varnames) }
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.debug_pubtypes 0 : { *(.debug_pubtypes) }
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.debug_ranges 0 : { *(.debug_ranges) }
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.debug_macro 0 : { *(.debug_macro) }
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.debug_addr 0 : { *(.debug_addr) }
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.gnu.attributes 0 : { KEEP(*(.gnu.attributes)) }
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.GCC.command.line 0 : { *(.GCC.command.line) }
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/DISCARD/ : {
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*(.comment)
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*(.discard)
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*(.yoink)
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*(.*)
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}
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}
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HIDDEN(__privileged_addr = ROUNDDOWN(__privileged_start, PAGESIZE));
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HIDDEN(__privileged_size = (ROUNDUP(__privileged_end, PAGESIZE) -
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ROUNDDOWN(__privileged_start, PAGESIZE)));
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@ -40,10 +40,6 @@ $(LIBC_ELF_A).pkg: \
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$(LIBC_ELF_A_OBJS) \
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$(foreach x,$(LIBC_ELF_A_DIRECTDEPS),$($(x)_A).pkg)
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o/libc/elf/elf.lds: \
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libc/elf/elf.lds \
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ape/relocations.h
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LIBC_ELF_LIBS = $(foreach x,$(LIBC_ELF_ARTIFACTS),$($(x)))
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LIBC_ELF_SRCS = $(foreach x,$(LIBC_ELF_ARTIFACTS),$($(x)_SRCS))
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LIBC_ELF_HDRS = $(foreach x,$(LIBC_ELF_ARTIFACTS),$($(x)_HDRS))
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