142 lines
2.1 KiB
ArmAsm
142 lines
2.1 KiB
ArmAsm
.globl hw_bswap16
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.globl hw_bswap32
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.globl hw_bswap64
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.globl _cu_memcpy
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.globl _cu_memmove
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.globl _cu_memcmp
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.globl _cu_memset
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.globl cu_memzero
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.globl cu_memtest
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.globl cu_va_start
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.globl cu_va_arg
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.text
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hw_bswap16:
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rev w0, w0
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mov w0, w0, lsr #16
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ret
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hw_bswap32:
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rev w0, w0
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ret
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hw_bswap64:
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rev x0, x0
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ret
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_cu_memcpy:
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// x0 - dst, x1 - src, x2 - size
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mov x3, x2, lsr #3
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tst x3, x3
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beq .cpy1_
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.cpy8:
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ldr x4, [x1], #8
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str x4, [x0], #8
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subs x3, x3, #1
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bne .cpy8
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.cpy1_:
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and x3, x2, #7
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beq .cpy0
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.cpy1:
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ldrb w4, [x1], #1
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strb w4, [x0], #1
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subs x3, x3, #1
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bne .cpy1
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.cpy0:
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ret
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_cu_memmove:
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// x0 - dst, x1 - src, x2 - size
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cmp x0, x1
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beq .move0
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blt .less1
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add x0, x0, x2
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add x1, x1, x2
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sub x0, x0, #1
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sub x1, x1, #1
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.greater1:
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ldrb w3, [x1]
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strb w3, [x0]
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sub x0, x0, #1
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sub x1, x1, #1
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subs x2, x2, #1
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bne .greater1
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b .move0
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.less1:
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ldrb w3, [x1], #1
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strb w3, [x0], #1
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subs x2, x2, #1
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bne .less1
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.move0:
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ret
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_cu_memcmp:
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// x0 - dst, x1 - src, x2 - size
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mov x3, x2, lsr #3
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tst x3, x3
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beq .cmp1_
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.cmp8:
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ldr x4, [x0], #8
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ldr x5, [x1], #8
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cmp x4, x5
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bne .cmpnot
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subs x3, x3, #1
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bne .cmp8
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.cmp1_:
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and x3, x2, #7
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beq .cmpok
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.cmp1:
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ldrb w4, [x0], #1
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ldrb w5, [x1], #1
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cmp w4, w5
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bne .cmpnot
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subs x3, x3, #1
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bne .cmp1
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.cmpok:
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mov x0, xzr
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ret
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.cmpnot:
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mov x0, #1
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ret
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_cu_memset:
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// x0 - dst, x1 - val, x2 - size
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orr x4, x1, x1, lsl #0
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orr x4, x4, x1, lsl #8
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orr x4, x4, x1, lsl #16
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orr x4, x4, x1, lsl #24
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orr x4, x4, x1, lsl #32
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orr x4, x4, x1, lsl #40
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orr x4, x4, x1, lsl #48
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orr x4, x4, x1, lsl #56
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mov x3, x2, lsr #3
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tst x3, x3
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beq .set1_
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.set8:
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str x4, [x0], #8
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subs x3, x3, #1
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bne .set8
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.set1_:
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and x3, x2, #7
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beq .set0
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.set1:
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strb w4, [x0], #1
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subs x3, x3, #1
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bne .set1
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.set0:
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ret
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cu_memzero:
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ret
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cu_memtest:
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ret
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cu_va_start:
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ret
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cu_va_arg:
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ret
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