diff options
Diffstat (limited to 'newlib/libc/machine/rx/strcat.S')
| -rw-r--r-- | newlib/libc/machine/rx/strcat.S | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/newlib/libc/machine/rx/strcat.S b/newlib/libc/machine/rx/strcat.S new file mode 100644 index 000000000..7ceffb744 --- /dev/null +++ b/newlib/libc/machine/rx/strcat.S @@ -0,0 +1,22 @@ + .file "strcat.S" + + .section .text + .global _strcat + .type _strcat,@function +_strcat: + ;; On entry: r1 => Destination + ;; r2 => Source + mov r1, r4 ; Save a copy of the dest pointer. + mov r2, r5 ; Save a copy of the source pointer. + + mov #0, r2 ; Search for the NUL byte. + mov #-1, r3 ; Limit on the number of bytes examined. + suntil.b ; Find the end of the destination string. + sub #1, r1 ; suntil.b leaves r1 pointing to the byte beyond the match. + + mov #-1, r3 ; Set a limit on the number of bytes copied. + mov r5, r2 ; Restore the source pointer. + smovu ; Copy source to destination + + mov r4, r1 ; Return the original dest pointer. + rts |