100 lines
3.5 KiB
ArmAsm
100 lines
3.5 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 │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program is distributed in the hope that it will be useful, but │
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/dce.h"
|
|
#include "libc/macros.h"
|
|
#include "libc/notice.inc"
|
|
#include "libc/sysv/consts/prot.h"
|
|
#include "libc/sysv/consts/map.h"
|
|
#include "libc/dce.h"
|
|
.text.startup
|
|
.source __FILE__
|
|
|
|
/ Stack frame that owns process from spawn to exit.
|
|
/
|
|
/ @param edi is argc
|
|
/ @param rsi is argv
|
|
/ @param rdx is environ
|
|
/ @param rcx is auxv
|
|
/ @noreturn
|
|
_executive:
|
|
push %rbp
|
|
mov %rsp,%rbp
|
|
ezlea _base,bx
|
|
mov %edi,%r12d
|
|
mov %rsi,%r13
|
|
mov %rdx,%r14
|
|
mov %rcx,%r15
|
|
call _spawn
|
|
call _getstack
|
|
mov %rax,%rdi
|
|
.weak main
|
|
mov $main,%esi
|
|
mov %r12,%rdx
|
|
mov %r13,%rcx
|
|
mov %r14,%r8
|
|
mov %r15,%r9
|
|
call _setstack
|
|
mov %eax,%edi
|
|
call exit
|
|
9: .endfn _executive,weak,hidden
|
|
|
|
ud2
|
|
|
|
#ifdef __PG__
|
|
/ Enables plaintext function tracing if --ftrace flag passed.
|
|
/
|
|
/ The --ftrace CLI arg is removed before main() is called. This
|
|
/ code is intended for diagnostic purposes and assumes binaries
|
|
/ are trustworthy and stack isn't corrupted. Logging plain text
|
|
/ allows program structure to easily be visualized and hotspots
|
|
/ identified w/ sed | sort | uniq -c | sort. A compressed trace
|
|
/ can be made by appending --ftrace 2>&1 | gzip -4 >trace.gz to
|
|
/ the CLI arguments. Have fun.
|
|
/
|
|
/ @see libc/runtime/ftrace.greg.c
|
|
/ @see libc/crt/crt.S
|
|
.init.start 800,_init_ftrace
|
|
push %rdi
|
|
push %rsi
|
|
xor %edx,%edx
|
|
loadstr "--ftrace",di
|
|
xor %ecx,%ecx
|
|
0: inc %ecx
|
|
mov (%r13,%rcx,8),%rsi
|
|
test %edx,%edx
|
|
jz 1f
|
|
mov %rsi,-8(%r13,%rcx,8)
|
|
1: test %rsi,%rsi
|
|
jz 2f
|
|
test %edx,%edx
|
|
jnz 0b
|
|
call tinystrcmp
|
|
test %eax,%eax
|
|
setz %dl
|
|
jmp 0b
|
|
2: sub %rdx,%r12
|
|
test %edx,%edx
|
|
jz 2f
|
|
call ftrace_init
|
|
2: pop %rsi
|
|
pop %rdi
|
|
.init.end 800,_init_ftrace
|
|
#endif /* -pg */
|