mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
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
147 lines
4.6 KiB
ArmAsm
147 lines
4.6 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/dce.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/notice.inc"
|
|
#include "libc/runtime/internal.h"
|
|
.section .start,"ax",@progbits
|
|
|
|
#if SupportsXnu() && defined(__x86_64__)
|
|
// XNU AMD64 Entrypoint
|
|
//
|
|
// @note Rosetta barely implements MAC_LC_UNIXTHREAD
|
|
// @note Rosetta sets many registers to weird values
|
|
_apple: mov $_HOSTXNU,%cl
|
|
jmp 1f
|
|
.endfn _apple,weak,hidden
|
|
#endif
|
|
|
|
// System Five userspace program entrypoint.
|
|
//
|
|
// @param rsp is [n,argv₀..argvₙ₋₁,0,envp₀..,0,auxv₀..,0,..]
|
|
// @note FreeBSD is special (see freebsd/lib/csu/amd64/...)
|
|
// @note NetBSD will only zero the call-clobbered registers
|
|
// @note ape.S and ape-loader both set RCX to XNU on Darwin
|
|
// @noreturn
|
|
_start:
|
|
#ifdef __x86_64__
|
|
|
|
#if SupportsFreebsd()
|
|
// detect free besiyata dishmaya
|
|
test %rdi,%rdi
|
|
cmovnz %rdi,%rsp
|
|
jz 0f
|
|
movb $_HOSTFREEBSD,%cl
|
|
0:
|
|
#endif
|
|
|
|
// set operating system when already detected
|
|
1: mov %cl,__hostos(%rip)
|
|
|
|
// get startup timestamp as early as possible
|
|
// its used by --strace flag and kprintf() %T
|
|
rdtsc
|
|
ezlea kStartTsc,bx
|
|
mov %eax,(%rbx)
|
|
mov %edx,4(%rbx)
|
|
|
|
// translates arguments from old stack abi
|
|
mov (%rsp),%ebx // argc
|
|
lea 8(%rsp),%rsi // argv
|
|
lea 16(%rsp,%rbx,8),%rdx // envp
|
|
mov %rsp,__oldstack(%rip)
|
|
|
|
// setup a stack frame
|
|
// align stack to GetStackSize() so GetStackAddr() is fast
|
|
.weak ape_stack_memsz
|
|
mov $ape_stack_memsz,%r9d
|
|
mov $16,%r8d
|
|
test %r9d,%r9d
|
|
cmovnz %r9,%r8
|
|
neg %r8
|
|
and %r8,%rsp
|
|
xor %ebp,%ebp
|
|
// bofram 9f
|
|
|
|
#if SupportsWindows()
|
|
// make win32 imps noop
|
|
.weak ape_idata_iat
|
|
.weak ape_idata_iatend
|
|
ezlea _missingno,ax
|
|
ezlea ape_idata_iat,di
|
|
ezlea ape_idata_iatend,cx
|
|
sub %rdi,%rcx
|
|
shr $3,%ecx
|
|
rep stosq
|
|
#endif
|
|
|
|
// scan through environment varis
|
|
// find start of auxiliary values
|
|
xor %eax,%eax
|
|
or $-1,%ecx
|
|
mov %rdx,%rdi
|
|
repnz scasq
|
|
mov %rdi,%rcx // auxv
|
|
|
|
#if SupportsXnu()
|
|
// xnu doesn't have auxiliary values
|
|
testb IsXnu()
|
|
jz 1f // polyfill xnu auxv
|
|
push $0 // auxv[1][1]=0
|
|
push $0 // auxv[1][0]=0
|
|
mov %rsp,%rcx // auxv
|
|
#endif
|
|
|
|
// enter cosmopolitan runtime
|
|
1: mov %ebx,%edi
|
|
call cosmo
|
|
9: .unreachable
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
#elif defined(__aarch64__)
|
|
|
|
// save original stack pointer
|
|
// this is the first argument to cosmo() below
|
|
mov x0,sp
|
|
|
|
// align stack to GetStackSize() so GetStackAddr() is fast
|
|
mov x1,sp
|
|
.weak ape_stack_memsz
|
|
ldr x2,=ape_stack_memsz
|
|
neg x2,x2
|
|
and x1,x2,x1
|
|
mov sp,x1
|
|
|
|
// setup backtraces
|
|
mov x29,#0
|
|
|
|
// second arg shall be struct Syslib passed by ape-m1.c
|
|
// used to talk to apple's authoritarian libraries
|
|
// should be set to zero on other platforms
|
|
mov x1,x15
|
|
|
|
// switch to c code
|
|
bl cosmo
|
|
.unreachable
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
#else
|
|
#error "architecture unsupported"
|
|
#endif /* __x86_64__ */
|
|
.endfn _start,weak,hidden
|