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|
; Licensed to the .NET Foundation under one or more agreements.
; The .NET Foundation licenses this file to you under the MIT license.
; See the LICENSE file in the project root for more information.
;; ==++==
;;
;;
;; ==--==
#include "ksarm64.h"
TEXTAREA
; Calls to JIT_MemSet is emitted by jit for initialization of large structs.
; We need to provide our own implementation of memset instead of using the ones in crt because crt implementation does not gurantee
; that aligned 8/4/2 - byte memory will be written atomically. This is required because members in a struct can be read atomically
; and their values should be written atomically.
;
;
;void JIT_MemSet(void *dst, int val, SIZE_T count)
;{
; uintptr_t valEx = (char)val;
; valEx = valEx | valEx << 8;
; valEx = valEx | valEx << 16;
; valEx = valEx | valEx << 32;
;
; // If not aligned then make it 8-byte aligned
; if(((uintptr_t)dst&0x7) != 0)
; {
; if(((uintptr_t)dst&0x3) == 0)
; {
; *(UINT*)dst = (UINT)valEx;
; dst = (UINT*)dst + 1;
; count-=4;
; }
; else if(((uintptr_t)dst&0x1) == 0)
; {
; while(count > 0 && ((uintptr_t)dst&0x7) != 0)
; {
; *(short*)dst = (short)valEx;
; dst = (short*)dst + 1;
; count-=2;
; }
; }
; else
; {
; while(count > 0 && ((uintptr_t)dst&0x7) != 0)
; {
; *(char*)dst = (char)valEx;
; dst = (char*)dst + 1;
; count--;
; }
; }
; }
;
; while(count >= 8)
; {
; *(uintptr_t*)dst = valEx;
; dst = (uintptr_t*)dst + 1;
; count-=8;
; }
;
; if(count & 4)
; {
; *(UINT*)dst = (UINT)valEx;
; dst = (UINT*)dst + 1;
; }
;
; if(count & 2)
; {
; *(short*)dst = (short)valEx;
; dst = (short*)dst + 1;
; }
;
; if(count & 1)
; {
; *(char*)dst = (char)valEx;
; }
;}
;
; Assembly code corresponding to above C++ method. JIT_MemSet can AV and clr exception personality routine needs to
; determine if the exception has taken place inside JIT_Memset in order to throw corresponding managed exception.
; Determining this is slow if the method were implemented as C++ method (using unwind info). In .asm file by adding JIT_MemSet_End
; marker it can be easily determined if exception happened in JIT_MemSet. Therefore, JIT_MemSet has been written in assembly instead of
; as C++ method.
LEAF_ENTRY JIT_MemSet
sxtb w8,w1
sxtw x8,w8
orr x8,x8,x8 lsl #8
orr x8,x8,x8 lsl #0x10
orr x9,x8,x8 lsl #0x20
and x8,x0,#7
cbz x8,JIT_MemSet_0x7c
and x8,x0,#3
cbnz x8,JIT_MemSet_0x38
str w9,[x0]
add x0,x0,#4
mov x8,#-4
add x2,x2,x8
b JIT_MemSet_0x7c
JIT_MemSet_0x38
cbz x2,JIT_MemSet_0x7c
tbnz x0,#0,JIT_MemSet_0x60
JIT_MemSet_0x40
and x8,x0,#7
cbz x8,JIT_MemSet_0x7c
strh w9,[x0]
add x0,x0,#2
mov x8,#-2
add x2,x2,x8
cbnz x2,JIT_MemSet_0x40
b JIT_MemSet_0x7c
JIT_MemSet_0x60
and x8,x0,#7
cbz x8,JIT_MemSet_0x7c
strb w9,[x0]
add x0,x0,#1
mov x8,#-1
add x2,x2,x8
cbnz x2,JIT_MemSet_0x60
JIT_MemSet_0x7c
cmp x2,#8
blo JIT_MemSet_0xb8
lsr x8,x2,#3
mov x11,x8
mov x10,x0
add x8,x10,x11 lsl #3
JIT_MemSet_0x9c
cmp x10,x8
beq JIT_MemSet_0xac
str x9,[x10],#8
b JIT_MemSet_0x9c
JIT_MemSet_0xac
mov x8,#-8
madd x2,x11,x8,x2
add x0,x0,x11 lsl #3
JIT_MemSet_0xb8
tbz x2,#2,JIT_MemSet_0xc4
str w9,[x0]
add x0,x0,#4
JIT_MemSet_0xc4
tbz x2,#1,JIT_MemSet_0xd0
strh w9,[x0]
add x0,x0,#2
JIT_MemSet_0xd0
tbz x2,#0,JIT_MemSet_0xd8
strb w9,[x0]
JIT_MemSet_0xd8
ret lr
LEAF_END
LEAF_ENTRY JIT_MemSet_End
LEAF_END
; See comments above for JIT_MemSet
;void JIT_MemCpy(void *dst, const void *src, SIZE_T count)
;{
; // If not aligned then make it 8-byte aligned
; if(((uintptr_t)dst&0x7) != 0)
; {
; if(((uintptr_t)dst&0x3) == 0)
; {
; *(UINT*)dst = *(UINT*)src;
; dst = (UINT*)dst + 1;
; src = (UINT*)src + 1;
; count-=4;
; }
; else if(((uintptr_t)dst&0x1) == 0)
; {
; while(count > 0 && ((uintptr_t)dst&0x7) != 0)
; {
; *(short*)dst = *(short*)src;
; dst = (short*)dst + 1;
; src = (short*)src + 1;
; count-=2;
; }
; }
; else
; {
; while(count > 0 && ((uintptr_t)dst&0x7) != 0)
; {
; *(char*)dst = *(char*)src;
; dst = (char*)dst + 1;
; src = (char*)src + 1;
; count--;
; }
; }
; }
;
; while(count >= 8)
; {
; *(uintptr_t*)dst = *(uintptr_t*)src;
; dst = (uintptr_t*)dst + 1;
; src = (uintptr_t*)src + 1;
; count-=8;
; }
;
; if(count & 4)
; {
; *(UINT*)dst = *(UINT*)src;
; dst = (UINT*)dst + 1;
; src = (UINT*)src + 1;
; }
;
; if(count & 2)
; {
; *(short*)dst = *(short*)src;
; dst = (short*)dst + 1;
; src = (short*)src + 1;
; }
;
; if(count & 1)
; {
; *(char*)dst = *(char*)src;
; }
;}
;
; Assembly code corresponding to above C++ method.
; See comments above for JIT_MemSet method
LEAF_ENTRY JIT_MemCpy
and x8,x0,#7
cbz x8,JIT_MemCpy_0x80
and x8,x0,#3
cbnz x8,JIT_MemCpy_0x2c
ldr w8,[x1]
str w8,[x0]
add x0,x0,#4
add x1,x1,#4
mov x8,#-4
add x2,x2,x8
b JIT_MemCpy_0x80
JIT_MemCpy_0x2c
cbz x2,JIT_MemCpy_0x80
tbnz x0,#0,JIT_MemCpy_0x5c
JIT_MemCpy_0x34
and x8,x0,#7
cbz x8,JIT_MemCpy_0x80
ldrsh w8,[x1]
strh w8,[x0]
add x0,x0,#2
add x1,x1,#2
mov x8,#-2
add x2,x2,x8
cbnz x2,JIT_MemCpy_0x34
b JIT_MemCpy_0x80
JIT_MemCpy_0x5c
and x8,x0,#7
cbz x8,JIT_MemCpy_0x80
ldrsb w8,[x1]
strb w8,[x0]
add x0,x0,#1
add x1,x1,#1
mov x8,#-1
add x2,x2,x8
cbnz x2,JIT_MemCpy_0x5c
JIT_MemCpy_0x80
cmp x2,#8
blo JIT_MemCpy_0xb4
lsr x9,x2,#3
mov x8,#-8
madd x2,x9,x8,x2
JIT_MemCpy_0xa0
ldr x8,[x1],#8
str x8,[x0],#8
mov x8,#-1
add x9,x9,x8
cbnz x9,JIT_MemCpy_0xa0
JIT_MemCpy_0xb4
tbz x2,#2,JIT_MemCpy_0xc8
ldr w8,[x1]
str w8,[x0]
add x0,x0,#4
add x1,x1,#4
JIT_MemCpy_0xc8
tbz x2,#1,JIT_MemCpy_0xdc
ldrsh w8,[x1]
strh w8,[x0]
add x0,x0,#2
add x1,x1,#2
JIT_MemCpy_0xdc
tbz x2,#0,JIT_MemCpy_0xe8
ldrsb w8,[x1]
strb w8,[x0]
JIT_MemCpy_0xe8
ret lr
LEAF_END
LEAF_ENTRY JIT_MemCpy_End
LEAF_END
; Must be at very end of file
END
|
