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3dc86ce154
- compile.com now polyfills -march=native which gcc/clang removed - Guarantee zero Windows code is linked into non-Windows binaries - MODE=tinylinux binaries are now back to being as tiny as ~4kb - Improve the runtime's stack allocation / alignment hack - GitHub Actions now tests Linux modes for assurance
159 lines
5.4 KiB
ArmAsm
159 lines
5.4 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.internal.h"
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#include "libc/runtime/internal.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/dce.h"
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// Decentralized function for process initialization.
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//
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// Modules may inject cheap data structure initialization code into
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// this function using the .init.start and .init.end macros. That
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// code can use the LODS and STOS instructions to initialize memory
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// that's restricted to read-only after initialization by PIRO.
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//
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// This is fast, since the linker is able to roll-up initialization
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// for large codebases comprised of many modules, into a perfectly
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// linear order. It also enables a common pattern we use, which we
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// call “Referencing Is Initialization” (RII).
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//
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// C/C++ code should favor using ordinary constructors, since under
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// normal circumstances the compiler will clobber RDI and RSI which
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// are granted special meanings within this function.
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//
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// @param r12 is argc (still callee saved)
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// @param r13 is argv (still callee saved)
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// @param r14 is envp (still callee saved)
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// @param r15 is envp (still callee saved)
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// @note rdi is __init_bss_start (callee monotonic lockstep)
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// @note rsi is __init_rodata_start (callee monotonic lockstep)
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// @see .init.start & .init.end (libc/macros.internal.h)
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// @see ape/ape.lds
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.section .initprologue,"ax",@progbits
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.type _init,@function
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.globl _init
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_init:
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#ifdef __x86_64__
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push %rbp
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mov %rsp,%rbp
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ezlea __init_bss_start,di
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ezlea __init_rodata_start,si
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#elif defined(__aarch64__)
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stp x29,x30,[sp,-16]!
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mov x29,sp
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#endif
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.previous/*
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...
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decentralized content
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...
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*/.section .initepilogue,"ax",@progbits
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#ifdef __x86_64__
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#if IsModeDbg()
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_init_check_rdi_rsi:
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jmp 2f
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1: call abort
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2: ezlea __init_bss_end,ax
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cmp %rax,%rdi
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jne 1b
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ezlea __init_rodata_end,ax
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cmp %rax,%rsi
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jne 1b
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3: .endfn _init_check_rdi_rsi
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#endif
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leave
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#elif defined(__aarch64__)
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ldp x29,x30,[sp],#16
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#endif
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ret
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.previous
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#ifdef __x86_64__
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// Decentralized section for packed data structures & initializers.
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//
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// @see .initro (libc/macros.internal.h)
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// @see ape/ape.lds
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.section .initroprologue,"a",@progbits
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.type __init_rodata_start,@object
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.type __init_rodata_end,@object
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.globl __init_rodata_start,__init_rodata_end
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.hidden __init_rodata_start,__init_rodata_end
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.balign __SIZEOF_POINTER__
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.underrun
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__init_rodata_start:
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.previous/*
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...
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decentralized content
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...
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*/.section .initroepilogue,"a",@progbits
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__init_rodata_end:
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.byte 0x90
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.overrun
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.previous
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// Decentralized section for unpacked data structures.
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//
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// Data in this section becomes read-only after initialization.
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//
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// @see .piro.bss.init (libc/macros.internal.h)
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// @see libc/runtime/piro.c
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// @see ape/ape.lds
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.section .piro.bss.init.1,"aw",@nobits
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.type __init_bss_start,@object
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.type __init_bss_end,@object
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.globl __init_bss_start,__init_bss_end
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.hidden __init_bss_start,__init_bss_end
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.balign __SIZEOF_POINTER__
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.underrun
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__init_bss_start:
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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.bss.init.3,"aw",@nobits
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__init_bss_end:
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.byte 0
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.overrun
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.previous
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// Special area for Windows NT support code.
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//
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// Isolating this code adds value for Windows users by minimizing
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// page faults through improved locality. On System Five the PIRO
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// runtime can unmap these pages.
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//
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// @see libc/runtime/piro.c
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// @see ape/ape.lds
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.section .textwindowsprologue,"ax",@progbits
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.type __text_windows_start,@object
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.type __text_windows_end,@object
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.globl __text_windows_start,__text_windows_end
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.hidden __text_windows_start,__text_windows_end
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int3
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__text_windows_start:
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.previous/*
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...
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decentralized content
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...
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*/.section .textwindowsepilogue,"ax",@progbits
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__text_windows_end:
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int3
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.previous
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#endif /* __x86_64__ */
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