2020-06-16 13:38:43 +00:00
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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2020-06-15 14:18:57 +00:00
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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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.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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2020-06-16 02:01:28 +00:00
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.source __FILE__
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2020-06-15 14:18:57 +00:00
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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.inc)
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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: push %rbp
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mov %rsp,%rbp
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.profilable
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ezlea __init_bss_start,di
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ezlea __init_rodata_start,si
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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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#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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_woot: leave
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ret
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.previous
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/ Decentralized section for packed data structures & initializers.
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/
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/ @see .initro (libc/macros.inc)
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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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.align __SIZEOF_POINTER__
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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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.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.inc)
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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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.align __SIZEOF_POINTER__
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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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.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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