42 lines
713 B
ArmAsm
42 lines
713 B
ArmAsm
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! Entry: r4: destination
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! r5: source
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! Exit: r0: destination
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! r1-r2,r5: clobbered
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#include "asm.h"
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ENTRY(strcpy)
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mov r4,r0
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or r5,r0
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tst #3,r0
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SL(bf, L_setup_char_loop, mov r4,r0)
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mov.l @r5+,r1
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mov #0,r2
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cmp/str r2,r1
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SL(bt, Longword_loop_end, sub r5,r0)
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.align 2
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Longword_loop:
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mov.l r1,@(r0,r5)
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mov.l @r5+,r1
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cmp/str r2,r1
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bt Longword_loop_end
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mov.l r1,@(r0,r5)
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mov.l @r5+,r1
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cmp/str r2,r1
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bf Longword_loop
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Longword_loop_end:
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add #-4,r5
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add #3,r0
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.align 2
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L_char_loop:
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mov.b @r5+,r1
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L_char_loop_start:
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tst r1,r1
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SL(bf, L_char_loop, mov.b r1,@(r0,r5))
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rts
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mov r4,r0
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L_setup_char_loop:
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mov.b @r5+,r1
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bra L_char_loop_start
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sub r5,r0
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