mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
3f0bcdc3ef
- Exhaustively document cancellation points - Rename SIGCANCEL to SIGTHR just like BSDs - Further improve POSIX thread cancellations - Ensure asynchronous cancellations work correctly - Elevate the quality of getrandom() and getentropy() - Make futexes cancel correctly on OpenBSD 6.x and 7.x - Add reboot.com and shutdown.com to examples directory - Remove underscore prefix from awesome timespec_*() APIs - Create assertions that help verify our cancellation points - Remove bad timespec APIs (cmp generalizes eq/ne/gt/gte/lt/lte)
217 lines
6.2 KiB
ArmAsm
217 lines
6.2 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
|
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/notice.inc"
|
|
#include "libc/sysv/consts/prot.h"
|
|
#include "libc/sysv/consts/map.h"
|
|
#include "libc/intrin/strace.internal.h"
|
|
#include "libc/sysv/consts/map.h"
|
|
#include "libc/dce.h"
|
|
.text.startup
|
|
|
|
// Cosmopolitan runtime.
|
|
//
|
|
// @param edi is argc
|
|
// @param rsi is argv
|
|
// @param rdx is environ
|
|
// @param rcx is auxv
|
|
// @noreturn
|
|
cosmo: push %rbp
|
|
mov %rsp,%rbp
|
|
mov %edi,%r12d
|
|
mov %rsi,%r13
|
|
mov %rdx,%r14
|
|
mov %rcx,%r15
|
|
|
|
#ifdef SYSDEBUG
|
|
call __strace_init
|
|
mov %eax,%r12d
|
|
#endif /* SYSDEBUG */
|
|
|
|
// Windows always initializes FPU to douuble precision.
|
|
// WSL breaks Linux ABI by initializing FPU to double precision.
|
|
// This code makes long double long again.
|
|
//
|
|
// @see System V Application Binary Interface NexGen32e Architecture
|
|
// Processor Supplement, Version 1.0, December 5th, 2018
|
|
// Section 3.4.1: Initial Stack and Register State
|
|
fldcw 1f(%rip)
|
|
.rodata
|
|
.align 2
|
|
// 8087 FPU Control Word
|
|
// IM: Invalid Operation ───────────────┐
|
|
// DM: Denormal Operand ───────────────┐│
|
|
// ZM: Zero Divide ───────────────────┐││
|
|
// OM: Overflow ─────────────────────┐│││
|
|
// UM: Underflow ───────────────────┐││││
|
|
// PM: Precision ──────────────────┐│││││
|
|
// PC: Precision Control ───────┐ ││││││
|
|
// {float,∅,double,long double}│ ││││││
|
|
// RC: Rounding Control ──────┐ │ ││││││
|
|
// {even, →-∞, →+∞, →0} │┌┤ ││││││
|
|
// ┌┤││ ││││││
|
|
// d││││rr││││││
|
|
1: .short 0b00000000000000000001101111111
|
|
.previous
|
|
|
|
#ifdef __FAST_MATH__
|
|
push %rax
|
|
stmxcsr (%rsp)
|
|
orl $0x8040,(%rsp)
|
|
ldmxcsr (%rsp)
|
|
pop %rax
|
|
#endif
|
|
|
|
// run assembly init
|
|
call _init
|
|
|
|
// call constructors
|
|
ezlea __init_array_start,ax # static ctors in forward order
|
|
.weak __init_array_start # could be called multiple times
|
|
ezlea __init_array_end,cx # idempotency recommended
|
|
.weak __init_array_end # @see ape/ape.lds
|
|
1: cmp %rax,%rcx
|
|
je 2f
|
|
push %rax
|
|
push %rcx
|
|
call .Largs
|
|
call *(%rax)
|
|
pop %rcx
|
|
pop %rax
|
|
add $8,%rax
|
|
jmp 1b
|
|
|
|
// call main()
|
|
2: call .Largs
|
|
.weak main
|
|
call main
|
|
xchg %eax,%edi
|
|
call exit
|
|
|
|
.Largs: mov %r12d,%edi
|
|
mov %r13,%rsi
|
|
mov %r14,%rdx
|
|
mov %r15,%rcx
|
|
ret
|
|
.endfn cosmo,weak
|
|
|
|
// Enables Thread Local Storage.
|
|
.init.start 304,_init_tls
|
|
push %rdi
|
|
push %rsi
|
|
call __enable_tls
|
|
pop %rsi
|
|
pop %rdi
|
|
.init.end 304,_init_tls
|
|
|
|
#if !IsTiny()
|
|
// Creates deterministically addressed stack we can use
|
|
//
|
|
// This helps debugging be more comprehensible, because
|
|
// when diagnosing low-level problems when error report
|
|
// isn't working, sometimes numbers are all you have to
|
|
// go on, and we can't use them if kernel hardening has
|
|
// configured that meaningful data to be randomized.
|
|
//
|
|
// Having deterministic addresses is also key to ensure
|
|
// builds, execution, and other things are reproducible
|
|
.init.start 304,_init_stack
|
|
testb IsWindows()
|
|
jnz 9f
|
|
testb IsMetal()
|
|
jnz 9f
|
|
push %rdi
|
|
push %rsi
|
|
|
|
// allocate stack
|
|
movabs $ape_stack_vaddr,%rdi
|
|
mov $ape_stack_memsz,%esi
|
|
mov $ape_stack_prot,%edx
|
|
mov $MAP_STACK,%ecx
|
|
or MAP_ANONYMOUS,%ecx
|
|
or $-1,%r8
|
|
xor %r9d,%r9d
|
|
push %rsi
|
|
push %rsi
|
|
call mmap
|
|
pop %r8
|
|
pop %r8
|
|
pop %rsi
|
|
pop %rdi
|
|
cmp $-1,%rax
|
|
je 9f
|
|
|
|
// switch stacks
|
|
//
|
|
// we subtract 8 because the openbsd kernel always checks rsp
|
|
// is on a MAP_STACK interval non-inclusively of stack + size
|
|
leave
|
|
pop %rcx # return address
|
|
sub $8,%r8d # openbsd:stackbound
|
|
lea (%rax,%r8),%rsp
|
|
mov $ape_stack_align,%eax
|
|
neg %rax
|
|
and %rax,%rsp
|
|
push %rcx
|
|
push %rbp
|
|
mov %rsp,%rbp
|
|
|
|
9: nop
|
|
.init.end 304,_init_stack
|
|
.weak ape_stack_prot
|
|
.weak ape_stack_vaddr
|
|
.weak ape_stack_memsz
|
|
.weak ape_stack_align
|
|
#endif
|
|
|
|
#if IsAsan()
|
|
.init.start 305,_init_symbols
|
|
push %rdi
|
|
push %rsi
|
|
call __init_symbols
|
|
pop %rsi
|
|
pop %rdi
|
|
.init.end 305,_init_symbols
|
|
#endif
|
|
|
|
#ifdef __PG__
|
|
.init.start 306,_init_ftrace
|
|
push %rdi
|
|
push %rsi
|
|
call ftrace_init
|
|
mov %eax,%r12d
|
|
pop %rsi
|
|
pop %rdi
|
|
.init.end 306,_init_ftrace
|
|
#endif
|
|
|
|
#if IsModeDbg()
|
|
#ifdef SYSDEBUG
|
|
.init.start 307,_init_printargs
|
|
cmpl $0,__strace(%rip)
|
|
jz 1f
|
|
push %rdi
|
|
push %rsi
|
|
loadstr STRACE_PROLOGUE,di
|
|
call __printargs
|
|
pop %rsi
|
|
pop %rdi
|
|
1: .init.end 307,_init_printargs
|
|
#endif
|
|
#endif
|