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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 "unixasmmacros.inc"
//
// ==--==
// 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 = (unsigned 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, _TEXT
uxtb 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,LOCAL_LABEL(JIT_MemSet_0x7c)
and x8,x0,#3
cbnz x8,LOCAL_LABEL(JIT_MemSet_0x38)
str w9,[x0]
add x0,x0,#4
mov x8,#-4
add x2,x2,x8
b LOCAL_LABEL(JIT_MemSet_0x7c)
LOCAL_LABEL(JIT_MemSet_0x38):
cbz x2,LOCAL_LABEL(JIT_MemSet_0x7c)
tbnz x0,#0,LOCAL_LABEL(JIT_MemSet_0x60)
LOCAL_LABEL(JIT_MemSet_0x40):
and x8,x0,#7
cbz x8,LOCAL_LABEL(JIT_MemSet_0x7c)
strh w9,[x0]
add x0,x0,#2
mov x8,#-2
add x2,x2,x8
cbnz x2,LOCAL_LABEL(JIT_MemSet_0x40)
b LOCAL_LABEL(JIT_MemSet_0x7c)
LOCAL_LABEL(JIT_MemSet_0x60):
and x8,x0,#7
cbz x8,LOCAL_LABEL(JIT_MemSet_0x7c)
strb w9,[x0]
add x0,x0,#1
mov x8,#-1
add x2,x2,x8
cbnz x2,LOCAL_LABEL(JIT_MemSet_0x60)
LOCAL_LABEL(JIT_MemSet_0x7c):
cmp x2,#8
blo LOCAL_LABEL(JIT_MemSet_0xb8)
lsr x8,x2,#3
mov x11,x8
mov x10,x0
add x8,x10,x11, lsl #3
LOCAL_LABEL(JIT_MemSet_0x9c):
cmp x10,x8
beq LOCAL_LABEL(JIT_MemSet_0xac)
str x9,[x10],#8
b LOCAL_LABEL(JIT_MemSet_0x9c)
LOCAL_LABEL(JIT_MemSet_0xac):
mov x8,#-8
madd x2,x11,x8,x2
add x0,x0,x11, lsl #3
LOCAL_LABEL(JIT_MemSet_0xb8):
tbz x2,#2,LOCAL_LABEL(JIT_MemSet_0xc4)
str w9,[x0]
add x0,x0,#4
LOCAL_LABEL(JIT_MemSet_0xc4):
tbz x2,#1,LOCAL_LABEL(JIT_MemSet_0xd0)
strh w9,[x0]
add x0,x0,#2
LOCAL_LABEL(JIT_MemSet_0xd0):
tbz x2,#0,LOCAL_LABEL(JIT_MemSet_0xd8)
strb w9,[x0]
LOCAL_LABEL(JIT_MemSet_0xd8):
ret lr
LEAF_END_MARKED JIT_MemSet, _TEXT
// 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, _TEXT
and x8,x0,#7
cbz x8,LOCAL_LABEL(JIT_MemCpy_0x80)
and x8,x0,#3
cbnz x8,LOCAL_LABEL(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 LOCAL_LABEL(JIT_MemCpy_0x80)
LOCAL_LABEL(JIT_MemCpy_0x2c):
cbz x2,LOCAL_LABEL(JIT_MemCpy_0x80)
tbnz x0,#0,LOCAL_LABEL(JIT_MemCpy_0x5c)
LOCAL_LABEL(JIT_MemCpy_0x34):
and x8,x0,#7
cbz x8,LOCAL_LABEL(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,LOCAL_LABEL(JIT_MemCpy_0x34)
b LOCAL_LABEL(JIT_MemCpy_0x80)
LOCAL_LABEL(JIT_MemCpy_0x5c):
and x8,x0,#7
cbz x8,LOCAL_LABEL(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,LOCAL_LABEL(JIT_MemCpy_0x5c)
LOCAL_LABEL(JIT_MemCpy_0x80):
cmp x2,#8
blo LOCAL_LABEL(JIT_MemCpy_0xb4)
lsr x9,x2,#3
mov x8,#-8
madd x2,x9,x8,x2
LOCAL_LABEL(JIT_MemCpy_0xa0):
ldr x8,[x1],#8
str x8,[x0],#8
mov x8,#-1
add x9,x9,x8
cbnz x9,LOCAL_LABEL(JIT_MemCpy_0xa0)
LOCAL_LABEL(JIT_MemCpy_0xb4):
tbz x2,#2,LOCAL_LABEL(JIT_MemCpy_0xc8)
ldr w8,[x1]
str w8,[x0]
add x0,x0,#4
add x1,x1,#4
LOCAL_LABEL(JIT_MemCpy_0xc8):
tbz x2,#1,LOCAL_LABEL(JIT_MemCpy_0xdc)
ldrsh w8,[x1]
strh w8,[x0]
add x0,x0,#2
add x1,x1,#2
LOCAL_LABEL(JIT_MemCpy_0xdc):
tbz x2,#0,LOCAL_LABEL(JIT_MemCpy_0xe8)
ldrsb w8,[x1]
strb w8,[x0]
LOCAL_LABEL(JIT_MemCpy_0xe8):
ret lr
LEAF_END_MARKED JIT_MemCpy, _TEXT
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