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misc: Use C instead of asm for mem*() family of functions

This commit is contained in:
mintsuki 2023-05-30 12:23:31 +02:00
parent 4190710dc6
commit 679fdd4351
6 changed files with 106 additions and 272 deletions
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66
common/lib/mem.asm_aarch64
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@ -1,66 +0,0 @@
.section .text
.global memcpy
memcpy:
mov x3, x0
0:
cbz x2, 1f
ldrb w4, [x1], #1
strb w4, [x0], #1
sub x2, x2, #1
b 0b
1:
mov x0, x3
ret
.global memset
memset:
mov x3, x0
0:
cbz x2, 1f
strb w1, [x0], #1
sub x2, x2, #1
b 0b
1:
mov x0, x3
ret
.global memmove
memmove:
mov x3, x0
mov x5, x2
cmp x0, x1
b.gt 1f
0:
cbz x2, 2f
ldrb w4, [x1], #1
strb w4, [x0], #1
sub x2, x2, #1
b 0b
1:
sub x5, x5, #1
cbz x2, 2f
ldrb w4, [x1, x5]
strb w4, [x0, x5]
sub x2, x2, #1
b 1b
2:
mov x0, x3
ret
.global memcmp
memcmp:
mov x3, xzr
0:
cbz x2, 1f
ldrb w3, [x0], #1
ldrb w4, [x1], #1
sub w3, w3, w4
cbnz w3, 1f
sub x2, x2, #1
b 0b
1:
sxtw x0, w3
mov x0, x3
ret

55
common/lib/mem.asm_x86_64
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@ -1,55 +0,0 @@
section .text
global memcpy
memcpy:
mov rcx, rdx
mov rax, rdi
rep movsb
ret
global memset
memset:
push rdi
mov rax, rsi
mov rcx, rdx
rep stosb
pop rax
ret
global memmove
memmove:
mov rcx, rdx
mov rax, rdi
cmp rdi, rsi
ja .copy_backwards
rep movsb
jmp .done
.copy_backwards:
lea rdi, [rdi+rcx-1]
lea rsi, [rsi+rcx-1]
std
rep movsb
cld
.done:
ret
global memcmp
memcmp:
mov rcx, rdx
repe cmpsb
je .equal
mov al, byte [rdi-1]
sub al, byte [rsi-1]
movsx rax, al
jmp .done
.equal:
xor eax, eax
.done:
ret

76
common/lib/mem.s2.asm_ia32
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@ -1,79 +1,3 @@
section .text
global memcpy
memcpy:
push esi
push edi
mov eax, dword [esp+12]
mov edi, eax
mov esi, dword [esp+16]
mov ecx, dword [esp+20]
rep movsb
pop edi
pop esi
ret
global memset
memset:
push edi
mov edx, dword [esp+8]
mov edi, edx
mov eax, dword [esp+12]
mov ecx, dword [esp+16]
rep stosb
mov eax, edx
pop edi
ret
global memmove
memmove:
push esi
push edi
mov eax, dword [esp+12]
mov edi, eax
mov esi, dword [esp+16]
mov ecx, dword [esp+20]
cmp edi, esi
ja .copy_backwards
rep movsb
jmp .done
.copy_backwards:
lea edi, [edi+ecx-1]
lea esi, [esi+ecx-1]
std
rep movsb
cld
.done:
pop edi
pop esi
ret
global memcmp
memcmp:
push esi
push edi
mov edi, dword [esp+12]
mov esi, dword [esp+16]
mov ecx, dword [esp+20]
repe cmpsb
je .equal
mov al, byte [edi-1]
sub al, byte [esi-1]
movsx eax, al
jmp .done
.equal:
xor eax, eax
.done:
pop edi
pop esi
ret
global memcpy32to64 global memcpy32to64
memcpy32to64: memcpy32to64:
push ebp push ebp

53
common/lib/memory.s2.c Normal file
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#include <stdint.h>
#include <stddef.h>
void *memcpy(void *dest, const void *src, size_t n) {
uint8_t *pdest = (uint8_t *)dest;
const uint8_t *psrc = (const uint8_t *)src;
for (size_t i = 0; i < n; i++) {
pdest[i] = psrc[i];
}
return dest;
}
void *memset(void *s, int c, size_t n) {
uint8_t *p = (uint8_t *)s;
for (size_t i = 0; i < n; i++) {
p[i] = (uint8_t)c;
}
return s;
}
void *memmove(void *dest, const void *src, size_t n) {
uint8_t *pdest = (uint8_t *)dest;
const uint8_t *psrc = (const uint8_t *)src;
if (src > dest) {
for (size_t i = 0; i < n; i++) {
pdest[i] = psrc[i];
}
} else if (src < dest) {
for (size_t i = n; i > 0; i--) {
pdest[i-1] = psrc[i-1];
}
}
return dest;
}
int memcmp(const void *s1, const void *s2, size_t n) {
const uint8_t *p1 = (const uint8_t *)s1;
const uint8_t *p2 = (const uint8_t *)s2;
for (size_t i = 0; i < n; i++) {
if (p1[i] != p2[i]) {
return p1[i] < p2[i] ? -1 : 1;
}
}
return 0;
}

75
decompressor/mem.asm
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@ -1,75 +0,0 @@
section .text
global memcpy
memcpy:
push esi
push edi
mov eax, dword [esp+12]
mov edi, eax
mov esi, dword [esp+16]
mov ecx, dword [esp+20]
rep movsb
pop edi
pop esi
ret
global memset
memset:
push edi
mov edx, dword [esp+8]
mov edi, edx
mov eax, dword [esp+12]
mov ecx, dword [esp+16]
rep stosb
mov eax, edx
pop edi
ret
global memmove
memmove:
push esi
push edi
mov eax, dword [esp+12]
mov edi, eax
mov esi, dword [esp+16]
mov ecx, dword [esp+20]
cmp edi, esi
ja .copy_backwards
rep movsb
jmp .done
.copy_backwards:
lea edi, [edi+ecx-1]
lea esi, [esi+ecx-1]
std
rep movsb
cld
.done:
pop edi
pop esi
ret
global memcmp
memcmp:
push esi
push edi
mov edi, dword [esp+12]
mov esi, dword [esp+16]
mov ecx, dword [esp+20]
repe cmpsb
je .equal
mov al, byte [edi-1]
sub al, byte [esi-1]
movsx eax, al
jmp .done
.equal:
xor eax, eax
.done:
pop edi
pop esi
ret

53
decompressor/memory.c Normal file
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#include <stdint.h>
#include <stddef.h>
void *memcpy(void *dest, const void *src, size_t n) {
uint8_t *pdest = (uint8_t *)dest;
const uint8_t *psrc = (const uint8_t *)src;
for (size_t i = 0; i < n; i++) {
pdest[i] = psrc[i];
}
return dest;
}
void *memset(void *s, int c, size_t n) {
uint8_t *p = (uint8_t *)s;
for (size_t i = 0; i < n; i++) {
p[i] = (uint8_t)c;
}
return s;
}
void *memmove(void *dest, const void *src, size_t n) {
uint8_t *pdest = (uint8_t *)dest;
const uint8_t *psrc = (const uint8_t *)src;
if (src > dest) {
for (size_t i = 0; i < n; i++) {
pdest[i] = psrc[i];
}
} else if (src < dest) {
for (size_t i = n; i > 0; i--) {
pdest[i-1] = psrc[i-1];
}
}
return dest;
}
int memcmp(const void *s1, const void *s2, size_t n) {
const uint8_t *p1 = (const uint8_t *)s1;
const uint8_t *p2 = (const uint8_t *)s2;
for (size_t i = 0; i < n; i++) {
if (p1[i] != p2[i]) {
return p1[i] < p2[i] ? -1 : 1;
}
}
return 0;
}