diff options
| author | Taru Karttunen <taruti@taruti.net> | 2011-03-30 15:46:40 +0300 |
|---|---|---|
| committer | Taru Karttunen <taruti@taruti.net> | 2011-03-30 15:46:40 +0300 |
| commit | e5888a1ffdae813d7575f5fb02275c6bb07e5199 (patch) | |
| tree | d8d51eac403f07814b9e936eed0c9a79195e2450 /sys/src/ape/lib/ap/mips/strcpy.s | |
Import sources from 2011-03-30 iso image
Diffstat (limited to 'sys/src/ape/lib/ap/mips/strcpy.s')
| -rwxr-xr-x | sys/src/ape/lib/ap/mips/strcpy.s | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/sys/src/ape/lib/ap/mips/strcpy.s b/sys/src/ape/lib/ap/mips/strcpy.s new file mode 100755 index 000000000..77be42669 --- /dev/null +++ b/sys/src/ape/lib/ap/mips/strcpy.s @@ -0,0 +1,96 @@ +TEXT strcpy(SB), $0 + + MOVW s2+4(FP),R2 /* R2 is from pointer */ + MOVW R1, R3 /* R3 is to pointer */ + +/* + * align 'from' pointer + */ +l1: + AND $3, R2, R5 + ADDU $1, R2 + BEQ R5, l2 + MOVB -1(R2), R5 + ADDU $1, R3 + MOVB R5, -1(R3) + BNE R5, l1 + RET + +/* + * test if 'to' is also alligned + */ +l2: + AND $3,R3, R5 + BEQ R5, l4 + +/* + * copy 4 at a time, 'to' not aligned + */ +l3: + MOVW -1(R2), R4 + ADD $4, R2 + ADD $4, R3 + SRL $24,R4, R5 + MOVB R5, -4(R3) + BEQ R5, out + + SRL $16,R4, R5 + AND $0xff, R5 + MOVB R5, -3(R3) + BEQ R5, out + + SRL $8,R4, R5 + AND $0xff, R5 + MOVB R5, -2(R3) + BEQ R5, out + + AND $0xff,R4, R5 + MOVB R5, -1(R3) + BNE R5, l3 + +out: + RET + +/* + * word at a time both aligned + */ +l4: + MOVW $0xff000000, R7 + MOVW $0x00ff0000, R8 + +l5: + ADDU $4, R3 + MOVW -1(R2), R4 /* fetch */ + + ADDU $4, R2 + AND R7,R4, R5 /* is it byte 0 */ + AND R8,R4, R6 /* is it byte 1 */ + BEQ R5, b0 + + AND $0xff00,R4, R5 /* is it byte 2 */ + BEQ R6, b1 + + AND $0xff,R4, R6 /* is it byte 3 */ + BEQ R5, b2 + + MOVW R4, -4(R3) /* store */ + BNE R6, l5 + JMP out + +b0: + MOVB $0, -4(R3) + JMP out + +b1: + SRL $24, R4 + MOVB R4, -4(R3) + MOVB $0, -3(R3) + JMP out + +b2: + SRL $24,R4, R5 + MOVB R5, -4(R3) + SRL $16, R4 + MOVB R4, -3(R3) + MOVB $0, -2(R3) + JMP out |