Last change
on this file was
444,
checked in by satin@…, 6 years ago
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.0 KB
|
Rev | Line | |
---|
[444] | 1 | .file "strcat.S" |
---|
| 2 | |
---|
| 3 | .section .text |
---|
| 4 | .global _strcat |
---|
| 5 | .type _strcat,@function |
---|
| 6 | _strcat: |
---|
| 7 | ;; On entry: r1 => Destination |
---|
| 8 | ;; r2 => Source |
---|
| 9 | #ifdef __RX_DISALLOW_STRING_INSNS__ |
---|
| 10 | mov r1, r4 ; Save a copy of the dest pointer. |
---|
| 11 | |
---|
| 12 | 1: mov.b [r4+], r5 ; Find the NUL byte at the end of R4. |
---|
| 13 | cmp #0, r5 |
---|
| 14 | bne 1b |
---|
| 15 | |
---|
| 16 | sub #1, r4 ; Move R4 back to point at the NUL byte. |
---|
| 17 | |
---|
| 18 | 2: mov.b [r2+], r5 ; Copy bytes from R2 to R4 until we reach a NUL byte. |
---|
| 19 | mov.b r5, [r4+] |
---|
| 20 | cmp #0, r5 |
---|
| 21 | bne 2b |
---|
| 22 | |
---|
| 23 | rts |
---|
| 24 | #else |
---|
| 25 | mov r1, r4 ; Save a copy of the dest pointer. |
---|
| 26 | mov r2, r5 ; Save a copy of the source pointer. |
---|
| 27 | |
---|
| 28 | mov #0, r2 ; Search for the NUL byte. |
---|
| 29 | mov #-1, r3 ; Limit on the number of bytes examined. |
---|
| 30 | suntil.b ; Find the end of the destination string. |
---|
| 31 | sub #1, r1 ; suntil.b leaves r1 pointing to the byte beyond the match. |
---|
| 32 | |
---|
| 33 | mov #-1, r3 ; Set a limit on the number of bytes copied. |
---|
| 34 | mov r5, r2 ; Restore the source pointer. |
---|
| 35 | smovu ; Copy source to destination |
---|
| 36 | |
---|
| 37 | mov r4, r1 ; Return the original dest pointer. |
---|
| 38 | rts |
---|
| 39 | #endif |
---|
| 40 | .size _strcat, . - _strcat |
---|
| 41 | |
---|
Note: See
TracBrowser
for help on using the repository browser.