129 lines
3.8 KiB
ArmAsm
129 lines
3.8 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 "ape/relocations.h"
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#include "libc/macros.h"
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/ Escapes byte for string literal.
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/
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/ This turns stuff like (char)0xFF into \0377. The returned
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/ string is word-encoded, e.g. '\\'|'0'<<010|'3'<<020|etc.
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/
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/ @param dil contains byte to escape
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/ @see libc/nexgen32e/cescapec.c
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cescapec:
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movzbl %dil,%edi
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lea -7(%rdi),%ecx
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cmp $85,%cl
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ja 1f
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mov $'\\,%eax
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movzbl %cl,%ecx
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jmp *cescapectab(,%rcx,8)
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.Lanchorpoint:
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.LBEL: mov $'a',%ah
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ret
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.LBS: mov $'b',%ah
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ret
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.LHT: mov $'t',%ah
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ret
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.LLF: mov $'n',%ah
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ret
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.LVT: mov $'v',%ah
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ret
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.LFF: mov $'f',%ah
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ret
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.LCR: mov $'r',%ah
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ret
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.LDQ: mov $'\"',%ah
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ret
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.LSQ: mov $'\'',%ah
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ret
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.LBSL: mov $'\\',%ah
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ret
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#ifdef __STRICT_ANSI__
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.LQM: mov $'?',%ah
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ret
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#else
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.LQM:
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#endif
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1: mov %edi,%eax
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lea -0x20(%rax),%ecx
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cmp $0x5E,%ecx
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ja 2f
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ret
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2: and $-64,%eax
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mov %edi,%ecx
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and $56,%ecx
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shl $13,%ecx
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and $7,%edi
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shl $24,%edi
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or %ecx,%edi
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lea (%rdi,%rax,4),%eax
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add $'0<<030|'0<<020|'0<<010|'\\,%eax
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ret
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.endfn cescapec,globl
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.initro 300,_init_cescapec
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cescapectab.ro:
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.byte 1,.LBEL-.Lanchorpoint
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.byte 1,.LBS-.Lanchorpoint
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.byte 1,.LHT-.Lanchorpoint
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.byte 1,.LLF-.Lanchorpoint
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.byte 1,.LVT-.Lanchorpoint
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.byte 1,.LFF-.Lanchorpoint
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.byte 1,.LCR-.Lanchorpoint
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.byte '\"-'\r-1,1b-.Lanchorpoint
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.byte 1,.LDQ-.Lanchorpoint
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.byte '\'-'\"-1,1b-.Lanchorpoint
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.byte 1,.LSQ-.Lanchorpoint
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.byte '?-'\'-1,1b-.Lanchorpoint
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.byte 1,.LQM-.Lanchorpoint
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.byte '\\-'?-1,1b-.Lanchorpoint
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.byte 1,.LBSL-.Lanchorpoint
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.equ .Lcescapectab.ro.size,.-cescapectab.ro
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.org 8 - .Lcescapectab.ro.size % 8 + .
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.endobj cescapectab.ro,globl,hidden
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.previous
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.initbss 300,_init_cescapec
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cescapectab:
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.rept '\\-7+1
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.quad 0
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.endr
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.endobj cescapectab
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.previous
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.init.start 300,_init_cescapec
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ezlea .Lanchorpoint,dx
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mov $.Lcescapectab.ro.size/2,%ch
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0: xor %eax,%eax
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lodsb
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mov %al,%cl
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lodsb
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add %rdx,%rax
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1: stosq
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dec %cl
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jnz 1b
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dec %ch
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jnz 0b
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.if .Lcescapectab.ro.size % 8
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add $(8-.Lcescapectab.ro.size%8),%rsi
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.endif
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.init.end 300,_init_cescapec
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.source __FILE__
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