mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
412 lines
8.4 KiB
ArmAsm
412 lines
8.4 KiB
ArmAsm
/* Compare two memory blocks for differences in the first COUNT bytes.
|
|
Copyright (C) 2004-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
#include "asm-syntax.h"
|
|
|
|
#define PARMS 4+4 /* Preserve EBX. */
|
|
#define BLK1 PARMS
|
|
#define BLK2 BLK1+4
|
|
#define LEN BLK2+4
|
|
#define ENTRANCE pushl %ebx; cfi_adjust_cfa_offset (4); \
|
|
cfi_rel_offset (ebx, 0)
|
|
#define RETURN popl %ebx; cfi_adjust_cfa_offset (-4); \
|
|
cfi_restore (ebx); ret
|
|
|
|
/* Load an entry in a jump table into EBX. TABLE is a jump table
|
|
with relative offsets. INDEX is a register contains the index
|
|
into the jump table. */
|
|
#define LOAD_JUMP_TABLE_ENTRY(TABLE, INDEX) \
|
|
/* We first load PC into EBX. */ \
|
|
SETUP_PIC_REG(bx); \
|
|
/* Get the address of the jump table. */ \
|
|
addl $(TABLE - .), %ebx; \
|
|
/* Get the entry and convert the relative offset to the \
|
|
absolute address. */ \
|
|
addl (%ebx,INDEX,4), %ebx
|
|
|
|
.text
|
|
ALIGN (4)
|
|
ENTRY (memcmp)
|
|
ENTRANCE
|
|
|
|
movl BLK1(%esp), %eax
|
|
movl BLK2(%esp), %edx
|
|
movl LEN(%esp), %ecx
|
|
|
|
cmpl $1, %ecx
|
|
jne L(not_1)
|
|
movzbl (%eax), %ecx /* LEN == 1 */
|
|
cmpb (%edx), %cl
|
|
jne L(neq)
|
|
L(bye):
|
|
xorl %eax, %eax
|
|
RETURN
|
|
|
|
cfi_adjust_cfa_offset (4)
|
|
cfi_rel_offset (ebx, 0)
|
|
L(neq):
|
|
sbbl %eax, %eax
|
|
sbbl $-1, %eax
|
|
RETURN
|
|
|
|
cfi_adjust_cfa_offset (4)
|
|
cfi_rel_offset (ebx, 0)
|
|
L(not_1):
|
|
jl L(bye) /* LEN == 0 */
|
|
|
|
pushl %esi
|
|
cfi_adjust_cfa_offset (4)
|
|
movl %eax, %esi
|
|
cfi_rel_offset (esi, 0)
|
|
cmpl $32, %ecx;
|
|
jge L(32bytesormore) /* LEN => 32 */
|
|
|
|
LOAD_JUMP_TABLE_ENTRY (L(table_32bytes), %ecx)
|
|
addl %ecx, %edx
|
|
addl %ecx, %esi
|
|
_CET_NOTRACK jmp *%ebx
|
|
|
|
ALIGN (4)
|
|
L(28bytes):
|
|
movl -28(%esi), %eax
|
|
movl -28(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(24bytes):
|
|
movl -24(%esi), %eax
|
|
movl -24(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(20bytes):
|
|
movl -20(%esi), %eax
|
|
movl -20(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(16bytes):
|
|
movl -16(%esi), %eax
|
|
movl -16(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(12bytes):
|
|
movl -12(%esi), %eax
|
|
movl -12(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(8bytes):
|
|
movl -8(%esi), %eax
|
|
movl -8(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(4bytes):
|
|
movl -4(%esi), %eax
|
|
movl -4(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(0bytes):
|
|
popl %esi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (esi)
|
|
xorl %eax, %eax
|
|
RETURN
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
cfi_rel_offset (esi, 0)
|
|
cfi_rel_offset (ebx, 4)
|
|
L(29bytes):
|
|
movl -29(%esi), %eax
|
|
movl -29(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(25bytes):
|
|
movl -25(%esi), %eax
|
|
movl -25(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(21bytes):
|
|
movl -21(%esi), %eax
|
|
movl -21(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(17bytes):
|
|
movl -17(%esi), %eax
|
|
movl -17(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(13bytes):
|
|
movl -13(%esi), %eax
|
|
movl -13(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(9bytes):
|
|
movl -9(%esi), %eax
|
|
movl -9(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(5bytes):
|
|
movl -5(%esi), %eax
|
|
movl -5(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(1bytes):
|
|
movzbl -1(%esi), %eax
|
|
cmpb -1(%edx), %al
|
|
jne L(set)
|
|
popl %esi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (esi)
|
|
xorl %eax, %eax
|
|
RETURN
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
cfi_rel_offset (esi, 0)
|
|
cfi_rel_offset (ebx, 4)
|
|
L(30bytes):
|
|
movl -30(%esi), %eax
|
|
movl -30(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(26bytes):
|
|
movl -26(%esi), %eax
|
|
movl -26(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(22bytes):
|
|
movl -22(%esi), %eax
|
|
movl -22(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(18bytes):
|
|
movl -18(%esi), %eax
|
|
movl -18(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(14bytes):
|
|
movl -14(%esi), %eax
|
|
movl -14(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(10bytes):
|
|
movl -10(%esi), %eax
|
|
movl -10(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(6bytes):
|
|
movl -6(%esi), %eax
|
|
movl -6(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(2bytes):
|
|
movzwl -2(%esi), %eax
|
|
movzwl -2(%edx), %ecx
|
|
cmpb %cl, %al
|
|
jne L(set)
|
|
cmpl %ecx, %eax
|
|
jne L(set)
|
|
popl %esi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (esi)
|
|
xorl %eax, %eax
|
|
RETURN
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
cfi_rel_offset (esi, 0)
|
|
cfi_rel_offset (ebx, 4)
|
|
L(31bytes):
|
|
movl -31(%esi), %eax
|
|
movl -31(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(27bytes):
|
|
movl -27(%esi), %eax
|
|
movl -27(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(23bytes):
|
|
movl -23(%esi), %eax
|
|
movl -23(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(19bytes):
|
|
movl -19(%esi), %eax
|
|
movl -19(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(15bytes):
|
|
movl -15(%esi), %eax
|
|
movl -15(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(11bytes):
|
|
movl -11(%esi), %eax
|
|
movl -11(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(7bytes):
|
|
movl -7(%esi), %eax
|
|
movl -7(%edx), %ecx
|
|
cmpl %ecx, %eax
|
|
jne L(find_diff)
|
|
L(3bytes):
|
|
movzwl -3(%esi), %eax
|
|
movzwl -3(%edx), %ecx
|
|
cmpb %cl, %al
|
|
jne L(set)
|
|
cmpl %ecx, %eax
|
|
jne L(set)
|
|
movzbl -1(%esi), %eax
|
|
cmpb -1(%edx), %al
|
|
jne L(set)
|
|
popl %esi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (esi)
|
|
xorl %eax, %eax
|
|
RETURN
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
cfi_rel_offset (esi, 0)
|
|
cfi_rel_offset (ebx, 4)
|
|
ALIGN (4)
|
|
/* ECX >= 32. */
|
|
L(32bytesormore):
|
|
subl $32, %ecx
|
|
|
|
movl (%esi), %eax
|
|
cmpl (%edx), %eax
|
|
jne L(load_ecx)
|
|
|
|
movl 4(%esi), %eax
|
|
cmpl 4(%edx), %eax
|
|
jne L(load_ecx_4)
|
|
|
|
movl 8(%esi), %eax
|
|
cmpl 8(%edx), %eax
|
|
jne L(load_ecx_8)
|
|
|
|
movl 12(%esi), %eax
|
|
cmpl 12(%edx), %eax
|
|
jne L(load_ecx_12)
|
|
|
|
movl 16(%esi), %eax
|
|
cmpl 16(%edx), %eax
|
|
jne L(load_ecx_16)
|
|
|
|
movl 20(%esi), %eax
|
|
cmpl 20(%edx), %eax
|
|
jne L(load_ecx_20)
|
|
|
|
movl 24(%esi), %eax
|
|
cmpl 24(%edx), %eax
|
|
jne L(load_ecx_24)
|
|
|
|
movl 28(%esi), %eax
|
|
cmpl 28(%edx), %eax
|
|
jne L(load_ecx_28)
|
|
|
|
addl $32, %esi
|
|
addl $32, %edx
|
|
cmpl $32, %ecx
|
|
jge L(32bytesormore)
|
|
|
|
LOAD_JUMP_TABLE_ENTRY (L(table_32bytes), %ecx)
|
|
addl %ecx, %edx
|
|
addl %ecx, %esi
|
|
_CET_NOTRACK jmp *%ebx
|
|
|
|
L(load_ecx_28):
|
|
addl $0x4, %edx
|
|
L(load_ecx_24):
|
|
addl $0x4, %edx
|
|
L(load_ecx_20):
|
|
addl $0x4, %edx
|
|
L(load_ecx_16):
|
|
addl $0x4, %edx
|
|
L(load_ecx_12):
|
|
addl $0x4, %edx
|
|
L(load_ecx_8):
|
|
addl $0x4, %edx
|
|
L(load_ecx_4):
|
|
addl $0x4, %edx
|
|
L(load_ecx):
|
|
movl (%edx), %ecx
|
|
|
|
L(find_diff):
|
|
cmpb %cl, %al
|
|
jne L(set)
|
|
cmpb %ch, %ah
|
|
jne L(set)
|
|
shrl $16,%eax
|
|
shrl $16,%ecx
|
|
cmpb %cl, %al
|
|
jne L(set)
|
|
/* We get there only if we already know there is a
|
|
difference. */
|
|
cmpl %ecx, %eax
|
|
L(set):
|
|
sbbl %eax, %eax
|
|
sbbl $-1, %eax
|
|
popl %esi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (esi)
|
|
RETURN
|
|
END (memcmp)
|
|
|
|
.section .rodata
|
|
ALIGN (2)
|
|
L(table_32bytes) :
|
|
.long L(0bytes) - L(table_32bytes)
|
|
.long L(1bytes) - L(table_32bytes)
|
|
.long L(2bytes) - L(table_32bytes)
|
|
.long L(3bytes) - L(table_32bytes)
|
|
.long L(4bytes) - L(table_32bytes)
|
|
.long L(5bytes) - L(table_32bytes)
|
|
.long L(6bytes) - L(table_32bytes)
|
|
.long L(7bytes) - L(table_32bytes)
|
|
.long L(8bytes) - L(table_32bytes)
|
|
.long L(9bytes) - L(table_32bytes)
|
|
.long L(10bytes) - L(table_32bytes)
|
|
.long L(11bytes) - L(table_32bytes)
|
|
.long L(12bytes) - L(table_32bytes)
|
|
.long L(13bytes) - L(table_32bytes)
|
|
.long L(14bytes) - L(table_32bytes)
|
|
.long L(15bytes) - L(table_32bytes)
|
|
.long L(16bytes) - L(table_32bytes)
|
|
.long L(17bytes) - L(table_32bytes)
|
|
.long L(18bytes) - L(table_32bytes)
|
|
.long L(19bytes) - L(table_32bytes)
|
|
.long L(20bytes) - L(table_32bytes)
|
|
.long L(21bytes) - L(table_32bytes)
|
|
.long L(22bytes) - L(table_32bytes)
|
|
.long L(23bytes) - L(table_32bytes)
|
|
.long L(24bytes) - L(table_32bytes)
|
|
.long L(25bytes) - L(table_32bytes)
|
|
.long L(26bytes) - L(table_32bytes)
|
|
.long L(27bytes) - L(table_32bytes)
|
|
.long L(28bytes) - L(table_32bytes)
|
|
.long L(29bytes) - L(table_32bytes)
|
|
.long L(30bytes) - L(table_32bytes)
|
|
.long L(31bytes) - L(table_32bytes)
|
|
|
|
|
|
#undef bcmp
|
|
weak_alias (memcmp, bcmp)
|
|
#undef __memcmpeq
|
|
strong_alias (memcmp, __memcmpeq)
|
|
libc_hidden_builtin_def (memcmp)
|
|
libc_hidden_def (__memcmpeq)
|