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https://github.com/jart/cosmopolitan.git
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394d998315
At least in neovim, `│vi:` is not recognized as a modeline because it has no preceding whitespace. After fixing this, opening a file yields an error because `net` is not an option. (`noet`, however, is.)
147 lines
4.8 KiB
ArmAsm
147 lines
4.8 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/notice.inc"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/dce.h"
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#ifdef __x86_64__
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.text.startup
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// Cosmopolitan runtime.
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//
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// @param edi is argc
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// @param rsi is argv
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// @param rdx is environ
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// @param rcx is auxv
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// @noreturn
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cosmo: push %rbp
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mov %rsp,%rbp
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mov %edi,%r12d
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mov %rsi,%r13
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mov %rdx,%r14
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mov %rcx,%r15
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#if SYSDEBUG
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call __strace_init
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mov %eax,%r12d
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#endif /* SYSDEBUG */
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#ifndef NOX87
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// Windows always initializes FPU to douuble precision.
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// WSL breaks Linux ABI by initializing FPU to double precision.
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// This code makes long double long again.
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//
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// @see System V Application Binary Interface NexGen32e Architecture
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// Processor Supplement, Version 1.0, December 5th, 2018
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// Section 3.4.1: Initial Stack and Register State
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fldcw 1f(%rip)
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.rodata
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.balign 2
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// 8087 FPU Control Word
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// IM: Invalid Operation ───────────────┐
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// DM: Denormal Operand ───────────────┐│
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// ZM: Zero Divide ───────────────────┐││
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// OM: Overflow ─────────────────────┐│││
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// UM: Underflow ───────────────────┐││││
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// PM: Precision ──────────────────┐│││││
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// PC: Precision Control ───────┐ ││││││
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// {float,∅,double,long double}│ ││││││
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// RC: Rounding Control ──────┐ │ ││││││
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// {even, →-∞, →+∞, →0} │┌┤ ││││││
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// ┌┤││ ││││││
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// d││││rr││││││
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1: .short 0b00000000000000000001101111111
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.previous
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#endif
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#ifdef __FAST_MATH__
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push %rax
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stmxcsr (%rsp)
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orl $0x8040,(%rsp)
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ldmxcsr (%rsp)
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pop %rax
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#endif
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// run assembly init
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call _init
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// call constructors
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ezlea __init_array_end,ax // static ctors in forward order
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.weak __init_array_end // could be called multiple times
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ezlea __init_array_start,cx // idempotency recommended
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.weak __init_array_start // @see ape/ape.lds
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1: cmp %rax,%rcx
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je 2f
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sub $8,%rax
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push %rax
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push %rcx
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call .Largs
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call *(%rax)
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pop %rcx
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pop %rax
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jmp 1b
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// call main()
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2: call .Largs
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.weak main
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call main
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xchg %eax,%edi
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call exit
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.Largs: mov %r12d,%edi
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mov %r13,%rsi
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mov %r14,%rdx
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mov %r15,%rcx
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ret
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.endfn cosmo,weak
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// Enables Thread Local Storage.
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.init.start 304,_init_tls
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push %rdi
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push %rsi
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call __enable_tls
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pop %rsi
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pop %rdi
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.init.end 304,_init_tls
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#if IsAsan()
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.init.start 305,_init_symbols
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push %rdi
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push %rsi
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call __init_symbols
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pop %rsi
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pop %rdi
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.init.end 305,_init_symbols
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#endif
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#ifdef FTRACE
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.init.start 306,_init_ftrace
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push %rdi
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push %rsi
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call ftrace_init
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mov %eax,%r12d
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pop %rsi
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pop %rdi
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.init.end 306,_init_ftrace
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#endif
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#endif /* __x86_64__ */
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