mirror of
https://github.com/hashcat/hashcat.git
synced 2024-12-27 08:58:10 +00:00
453 lines
12 KiB
ArmAsm
453 lines
12 KiB
ArmAsm
/*
|
|
* match.S -- optimized version of longest_match()
|
|
* based on the similar work by Gilles Vollant, and Brian Raiter, written 1998
|
|
*
|
|
* This is free software; you can redistribute it and/or modify it
|
|
* under the terms of the BSD License. Use by owners of Che Guevarra
|
|
* parafernalia is prohibited, where possible, and highly discouraged
|
|
* elsewhere.
|
|
*/
|
|
|
|
#ifndef NO_UNDERLINE
|
|
# define match_init _match_init
|
|
# define longest_match _longest_match
|
|
#endif
|
|
|
|
#define scanend ebx
|
|
#define scanendw bx
|
|
#define chainlenwmask edx /* high word: current chain len low word: s->wmask */
|
|
#define curmatch rsi
|
|
#define curmatchd esi
|
|
#define windowbestlen r8
|
|
#define scanalign r9
|
|
#define scanalignd r9d
|
|
#define window r10
|
|
#define bestlen r11
|
|
#define bestlend r11d
|
|
#define scanstart r12d
|
|
#define scanstartw r12w
|
|
#define scan r13
|
|
#define nicematch r14d
|
|
#define limit r15
|
|
#define limitd r15d
|
|
#define prev rcx
|
|
|
|
/*
|
|
* The 258 is a "magic number, not a parameter -- changing it
|
|
* breaks the hell loose
|
|
*/
|
|
#define MAX_MATCH (258)
|
|
#define MIN_MATCH (3)
|
|
#define MIN_LOOKAHEAD (MAX_MATCH + MIN_MATCH + 1)
|
|
#define MAX_MATCH_8 ((MAX_MATCH + 7) & ~7)
|
|
|
|
/* stack frame offsets */
|
|
#define LocalVarsSize (112)
|
|
#define _chainlenwmask ( 8-LocalVarsSize)(%rsp)
|
|
#define _windowbestlen (16-LocalVarsSize)(%rsp)
|
|
#define save_r14 (24-LocalVarsSize)(%rsp)
|
|
#define save_rsi (32-LocalVarsSize)(%rsp)
|
|
#define save_rbx (40-LocalVarsSize)(%rsp)
|
|
#define save_r12 (56-LocalVarsSize)(%rsp)
|
|
#define save_r13 (64-LocalVarsSize)(%rsp)
|
|
#define save_r15 (80-LocalVarsSize)(%rsp)
|
|
|
|
|
|
.globl match_init, longest_match
|
|
|
|
/*
|
|
* On AMD64 the first argument of a function (in our case -- the pointer to
|
|
* deflate_state structure) is passed in %rdi, hence our offsets below are
|
|
* all off of that.
|
|
*/
|
|
|
|
/* you can check the structure offset by running
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include "deflate.h"
|
|
|
|
void print_depl()
|
|
{
|
|
deflate_state ds;
|
|
deflate_state *s=&ds;
|
|
printf("size pointer=%u\n",(int)sizeof(void*));
|
|
|
|
printf("#define dsWSize (%3u)(%%rdi)\n",(int)(((char*)&(s->w_size))-((char*)s)));
|
|
printf("#define dsWMask (%3u)(%%rdi)\n",(int)(((char*)&(s->w_mask))-((char*)s)));
|
|
printf("#define dsWindow (%3u)(%%rdi)\n",(int)(((char*)&(s->window))-((char*)s)));
|
|
printf("#define dsPrev (%3u)(%%rdi)\n",(int)(((char*)&(s->prev))-((char*)s)));
|
|
printf("#define dsMatchLen (%3u)(%%rdi)\n",(int)(((char*)&(s->match_length))-((char*)s)));
|
|
printf("#define dsPrevMatch (%3u)(%%rdi)\n",(int)(((char*)&(s->prev_match))-((char*)s)));
|
|
printf("#define dsStrStart (%3u)(%%rdi)\n",(int)(((char*)&(s->strstart))-((char*)s)));
|
|
printf("#define dsMatchStart (%3u)(%%rdi)\n",(int)(((char*)&(s->match_start))-((char*)s)));
|
|
printf("#define dsLookahead (%3u)(%%rdi)\n",(int)(((char*)&(s->lookahead))-((char*)s)));
|
|
printf("#define dsPrevLen (%3u)(%%rdi)\n",(int)(((char*)&(s->prev_length))-((char*)s)));
|
|
printf("#define dsMaxChainLen (%3u)(%%rdi)\n",(int)(((char*)&(s->max_chain_length))-((char*)s)));
|
|
printf("#define dsGoodMatch (%3u)(%%rdi)\n",(int)(((char*)&(s->good_match))-((char*)s)));
|
|
printf("#define dsNiceMatch (%3u)(%%rdi)\n",(int)(((char*)&(s->nice_match))-((char*)s)));
|
|
}
|
|
|
|
*/
|
|
|
|
|
|
/*
|
|
to compile for XCode 3.2 on MacOSX x86_64
|
|
- run "gcc -g -c -DXCODE_MAC_X64_STRUCTURE amd64-match.S"
|
|
*/
|
|
|
|
|
|
#ifndef CURRENT_LINX_XCODE_MAC_X64_STRUCTURE
|
|
#define dsWSize ( 68)(%rdi)
|
|
#define dsWMask ( 76)(%rdi)
|
|
#define dsWindow ( 80)(%rdi)
|
|
#define dsPrev ( 96)(%rdi)
|
|
#define dsMatchLen (144)(%rdi)
|
|
#define dsPrevMatch (148)(%rdi)
|
|
#define dsStrStart (156)(%rdi)
|
|
#define dsMatchStart (160)(%rdi)
|
|
#define dsLookahead (164)(%rdi)
|
|
#define dsPrevLen (168)(%rdi)
|
|
#define dsMaxChainLen (172)(%rdi)
|
|
#define dsGoodMatch (188)(%rdi)
|
|
#define dsNiceMatch (192)(%rdi)
|
|
|
|
#else
|
|
|
|
#ifndef STRUCT_OFFSET
|
|
# define STRUCT_OFFSET (0)
|
|
#endif
|
|
|
|
|
|
#define dsWSize ( 56 + STRUCT_OFFSET)(%rdi)
|
|
#define dsWMask ( 64 + STRUCT_OFFSET)(%rdi)
|
|
#define dsWindow ( 72 + STRUCT_OFFSET)(%rdi)
|
|
#define dsPrev ( 88 + STRUCT_OFFSET)(%rdi)
|
|
#define dsMatchLen (136 + STRUCT_OFFSET)(%rdi)
|
|
#define dsPrevMatch (140 + STRUCT_OFFSET)(%rdi)
|
|
#define dsStrStart (148 + STRUCT_OFFSET)(%rdi)
|
|
#define dsMatchStart (152 + STRUCT_OFFSET)(%rdi)
|
|
#define dsLookahead (156 + STRUCT_OFFSET)(%rdi)
|
|
#define dsPrevLen (160 + STRUCT_OFFSET)(%rdi)
|
|
#define dsMaxChainLen (164 + STRUCT_OFFSET)(%rdi)
|
|
#define dsGoodMatch (180 + STRUCT_OFFSET)(%rdi)
|
|
#define dsNiceMatch (184 + STRUCT_OFFSET)(%rdi)
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
.text
|
|
|
|
/* uInt longest_match(deflate_state *deflatestate, IPos curmatch) */
|
|
|
|
longest_match:
|
|
/*
|
|
* Retrieve the function arguments. %curmatch will hold cur_match
|
|
* throughout the entire function (passed via rsi on amd64).
|
|
* rdi will hold the pointer to the deflate_state (first arg on amd64)
|
|
*/
|
|
mov %rsi, save_rsi
|
|
mov %rbx, save_rbx
|
|
mov %r12, save_r12
|
|
mov %r13, save_r13
|
|
mov %r14, save_r14
|
|
mov %r15, save_r15
|
|
|
|
/* uInt wmask = s->w_mask; */
|
|
/* unsigned chain_length = s->max_chain_length; */
|
|
/* if (s->prev_length >= s->good_match) { */
|
|
/* chain_length >>= 2; */
|
|
/* } */
|
|
|
|
movl dsPrevLen, %eax
|
|
movl dsGoodMatch, %ebx
|
|
cmpl %ebx, %eax
|
|
movl dsWMask, %eax
|
|
movl dsMaxChainLen, %chainlenwmask
|
|
jl LastMatchGood
|
|
shrl $2, %chainlenwmask
|
|
LastMatchGood:
|
|
|
|
/* chainlen is decremented once beforehand so that the function can */
|
|
/* use the sign flag instead of the zero flag for the exit test. */
|
|
/* It is then shifted into the high word, to make room for the wmask */
|
|
/* value, which it will always accompany. */
|
|
|
|
decl %chainlenwmask
|
|
shll $16, %chainlenwmask
|
|
orl %eax, %chainlenwmask
|
|
|
|
/* if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead; */
|
|
|
|
movl dsNiceMatch, %eax
|
|
movl dsLookahead, %ebx
|
|
cmpl %eax, %ebx
|
|
jl LookaheadLess
|
|
movl %eax, %ebx
|
|
LookaheadLess: movl %ebx, %nicematch
|
|
|
|
/* register Bytef *scan = s->window + s->strstart; */
|
|
|
|
mov dsWindow, %window
|
|
movl dsStrStart, %limitd
|
|
lea (%limit, %window), %scan
|
|
|
|
/* Determine how many bytes the scan ptr is off from being */
|
|
/* dword-aligned. */
|
|
|
|
mov %scan, %scanalign
|
|
negl %scanalignd
|
|
andl $3, %scanalignd
|
|
|
|
/* IPos limit = s->strstart > (IPos)MAX_DIST(s) ? */
|
|
/* s->strstart - (IPos)MAX_DIST(s) : NIL; */
|
|
|
|
movl dsWSize, %eax
|
|
subl $MIN_LOOKAHEAD, %eax
|
|
xorl %ecx, %ecx
|
|
subl %eax, %limitd
|
|
cmovng %ecx, %limitd
|
|
|
|
/* int best_len = s->prev_length; */
|
|
|
|
movl dsPrevLen, %bestlend
|
|
|
|
/* Store the sum of s->window + best_len in %windowbestlen locally, and in memory. */
|
|
|
|
lea (%window, %bestlen), %windowbestlen
|
|
mov %windowbestlen, _windowbestlen
|
|
|
|
/* register ush scan_start = *(ushf*)scan; */
|
|
/* register ush scan_end = *(ushf*)(scan+best_len-1); */
|
|
/* Posf *prev = s->prev; */
|
|
|
|
movzwl (%scan), %scanstart
|
|
movzwl -1(%scan, %bestlen), %scanend
|
|
mov dsPrev, %prev
|
|
|
|
/* Jump into the main loop. */
|
|
|
|
movl %chainlenwmask, _chainlenwmask
|
|
jmp LoopEntry
|
|
|
|
.balign 16
|
|
|
|
/* do {
|
|
* match = s->window + cur_match;
|
|
* if (*(ushf*)(match+best_len-1) != scan_end ||
|
|
* *(ushf*)match != scan_start) continue;
|
|
* [...]
|
|
* } while ((cur_match = prev[cur_match & wmask]) > limit
|
|
* && --chain_length != 0);
|
|
*
|
|
* Here is the inner loop of the function. The function will spend the
|
|
* majority of its time in this loop, and majority of that time will
|
|
* be spent in the first ten instructions.
|
|
*/
|
|
LookupLoop:
|
|
andl %chainlenwmask, %curmatchd
|
|
movzwl (%prev, %curmatch, 2), %curmatchd
|
|
cmpl %limitd, %curmatchd
|
|
jbe LeaveNow
|
|
subl $0x00010000, %chainlenwmask
|
|
js LeaveNow
|
|
LoopEntry: cmpw -1(%windowbestlen, %curmatch), %scanendw
|
|
jne LookupLoop
|
|
cmpw %scanstartw, (%window, %curmatch)
|
|
jne LookupLoop
|
|
|
|
/* Store the current value of chainlen. */
|
|
movl %chainlenwmask, _chainlenwmask
|
|
|
|
/* %scan is the string under scrutiny, and %prev to the string we */
|
|
/* are hoping to match it up with. In actuality, %esi and %edi are */
|
|
/* both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and %edx is */
|
|
/* initialized to -(MAX_MATCH_8 - scanalign). */
|
|
|
|
mov $(-MAX_MATCH_8), %rdx
|
|
lea (%curmatch, %window), %windowbestlen
|
|
lea MAX_MATCH_8(%windowbestlen, %scanalign), %windowbestlen
|
|
lea MAX_MATCH_8(%scan, %scanalign), %prev
|
|
|
|
/* the prefetching below makes very little difference... */
|
|
prefetcht1 (%windowbestlen, %rdx)
|
|
prefetcht1 (%prev, %rdx)
|
|
|
|
/*
|
|
* Test the strings for equality, 8 bytes at a time. At the end,
|
|
* adjust %rdx so that it is offset to the exact byte that mismatched.
|
|
*
|
|
* It should be confessed that this loop usually does not represent
|
|
* much of the total running time. Replacing it with a more
|
|
* straightforward "rep cmpsb" would not drastically degrade
|
|
* performance -- unrolling it, for example, makes no difference.
|
|
*/
|
|
|
|
#undef USE_SSE /* works, but is 6-7% slower, than non-SSE... */
|
|
|
|
LoopCmps:
|
|
#ifdef USE_SSE
|
|
/* Preload the SSE registers */
|
|
movdqu (%windowbestlen, %rdx), %xmm1
|
|
movdqu (%prev, %rdx), %xmm2
|
|
pcmpeqb %xmm2, %xmm1
|
|
movdqu 16(%windowbestlen, %rdx), %xmm3
|
|
movdqu 16(%prev, %rdx), %xmm4
|
|
pcmpeqb %xmm4, %xmm3
|
|
movdqu 32(%windowbestlen, %rdx), %xmm5
|
|
movdqu 32(%prev, %rdx), %xmm6
|
|
pcmpeqb %xmm6, %xmm5
|
|
movdqu 48(%windowbestlen, %rdx), %xmm7
|
|
movdqu 48(%prev, %rdx), %xmm8
|
|
pcmpeqb %xmm8, %xmm7
|
|
|
|
/* Check the comparisions' results */
|
|
pmovmskb %xmm1, %rax
|
|
notw %ax
|
|
bsfw %ax, %ax
|
|
jnz LeaveLoopCmps
|
|
|
|
/* this is the only iteration of the loop with a possibility of having
|
|
incremented rdx by 0x108 (each loop iteration add 16*4 = 0x40
|
|
and (0x40*4)+8=0x108 */
|
|
add $8, %rdx
|
|
jz LenMaximum
|
|
add $8, %rdx
|
|
|
|
|
|
pmovmskb %xmm3, %rax
|
|
notw %ax
|
|
bsfw %ax, %ax
|
|
jnz LeaveLoopCmps
|
|
|
|
|
|
add $16, %rdx
|
|
|
|
|
|
pmovmskb %xmm5, %rax
|
|
notw %ax
|
|
bsfw %ax, %ax
|
|
jnz LeaveLoopCmps
|
|
|
|
add $16, %rdx
|
|
|
|
|
|
pmovmskb %xmm7, %rax
|
|
notw %ax
|
|
bsfw %ax, %ax
|
|
jnz LeaveLoopCmps
|
|
|
|
add $16, %rdx
|
|
|
|
jmp LoopCmps
|
|
LeaveLoopCmps: add %rax, %rdx
|
|
#else
|
|
mov (%windowbestlen, %rdx), %rax
|
|
xor (%prev, %rdx), %rax
|
|
jnz LeaveLoopCmps
|
|
|
|
mov 8(%windowbestlen, %rdx), %rax
|
|
xor 8(%prev, %rdx), %rax
|
|
jnz LeaveLoopCmps8
|
|
|
|
mov 16(%windowbestlen, %rdx), %rax
|
|
xor 16(%prev, %rdx), %rax
|
|
jnz LeaveLoopCmps16
|
|
|
|
add $24, %rdx
|
|
jnz LoopCmps
|
|
jmp LenMaximum
|
|
# if 0
|
|
/*
|
|
* This three-liner is tantalizingly simple, but bsf is a slow instruction,
|
|
* and the complicated alternative down below is quite a bit faster. Sad...
|
|
*/
|
|
|
|
LeaveLoopCmps: bsf %rax, %rax /* find the first non-zero bit */
|
|
shrl $3, %eax /* divide by 8 to get the byte */
|
|
add %rax, %rdx
|
|
# else
|
|
LeaveLoopCmps16:
|
|
add $8, %rdx
|
|
LeaveLoopCmps8:
|
|
add $8, %rdx
|
|
LeaveLoopCmps: testl $0xFFFFFFFF, %eax /* Check the first 4 bytes */
|
|
jnz Check16
|
|
add $4, %rdx
|
|
shr $32, %rax
|
|
Check16: testw $0xFFFF, %ax
|
|
jnz LenLower
|
|
add $2, %rdx
|
|
shrl $16, %eax
|
|
LenLower: subb $1, %al
|
|
adc $0, %rdx
|
|
# endif
|
|
#endif
|
|
|
|
/* Calculate the length of the match. If it is longer than MAX_MATCH, */
|
|
/* then automatically accept it as the best possible match and leave. */
|
|
|
|
lea (%prev, %rdx), %rax
|
|
sub %scan, %rax
|
|
cmpl $MAX_MATCH, %eax
|
|
jge LenMaximum
|
|
|
|
/* If the length of the match is not longer than the best match we */
|
|
/* have so far, then forget it and return to the lookup loop. */
|
|
|
|
cmpl %bestlend, %eax
|
|
jg LongerMatch
|
|
mov _windowbestlen, %windowbestlen
|
|
mov dsPrev, %prev
|
|
movl _chainlenwmask, %edx
|
|
jmp LookupLoop
|
|
|
|
/* s->match_start = cur_match; */
|
|
/* best_len = len; */
|
|
/* if (len >= nice_match) break; */
|
|
/* scan_end = *(ushf*)(scan+best_len-1); */
|
|
|
|
LongerMatch:
|
|
movl %eax, %bestlend
|
|
movl %curmatchd, dsMatchStart
|
|
cmpl %nicematch, %eax
|
|
jge LeaveNow
|
|
|
|
lea (%window, %bestlen), %windowbestlen
|
|
mov %windowbestlen, _windowbestlen
|
|
|
|
movzwl -1(%scan, %rax), %scanend
|
|
mov dsPrev, %prev
|
|
movl _chainlenwmask, %chainlenwmask
|
|
jmp LookupLoop
|
|
|
|
/* Accept the current string, with the maximum possible length. */
|
|
|
|
LenMaximum:
|
|
movl $MAX_MATCH, %bestlend
|
|
movl %curmatchd, dsMatchStart
|
|
|
|
/* if ((uInt)best_len <= s->lookahead) return (uInt)best_len; */
|
|
/* return s->lookahead; */
|
|
|
|
LeaveNow:
|
|
movl dsLookahead, %eax
|
|
cmpl %eax, %bestlend
|
|
cmovngl %bestlend, %eax
|
|
LookaheadRet:
|
|
|
|
/* Restore the registers and return from whence we came. */
|
|
|
|
mov save_rsi, %rsi
|
|
mov save_rbx, %rbx
|
|
mov save_r12, %r12
|
|
mov save_r13, %r13
|
|
mov save_r14, %r14
|
|
mov save_r15, %r15
|
|
|
|
ret
|
|
|
|
match_init: ret
|