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Fix some bugs

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Justine Tunney 2022-08-14 13:28:07 -07:00
parent 5584f6adcf
commit 6c0bbfac4a
15 changed files with 289 additions and 136 deletions
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50
libc/calls/program_invocation_short_name.S Normal file
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│vi: set et ft=asm ts=8 sw=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"
.initbss 400,_init_program_invocation_short_name
// Supplies basename(argv[0]) The GNU Way.
//
// If argv[0] isn't supplied, this value will be null.
//
// @see GetProgramExecutableName()
// @see program_invocation_name
program_invocation_short_name:
.quad 0
.endobj program_invocation_short_name,globl
.previous
.init.start 400,_init_program_invocation_short_name
push %rsi
xor %eax,%eax
test %r12d,%r12d # argc
jz 2f
mov (%r13),%rsi # argv[0]
mov %rsi,%rcx
1: lodsb
cmp $'/',%al
cmoveq %rsi,%rcx
cmp $'\\',%al
cmoveq %rsi,%rcx
test %al,%al
jnz 1b
xchg %rcx,%rax
pop %rsi
2: stosq
.init.end 400,_init_program_invocation_short_name