diff options
Diffstat (limited to 'newlib/libc/machine/rx/memmove.S')
| -rw-r--r-- | newlib/libc/machine/rx/memmove.S | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/newlib/libc/machine/rx/memmove.S b/newlib/libc/machine/rx/memmove.S new file mode 100644 index 000000000..4b126bafc --- /dev/null +++ b/newlib/libc/machine/rx/memmove.S @@ -0,0 +1,20 @@ + .file "memmove.S" + + .section .text + .global _memmove + .type _memmove,@function +_memmove: + mov r1, r4 ; Save a copy of DEST + cmp r1, r2 + blt 2f ; If SRC (r2) is less than DEST (r1) then copy backwards + smovf +1: + mov r4, r1 ; Return DEST + rts +2: + add r3, r1 ; The SMOVB instructions requires the DEST in r1 and the + add r3, r2 ; SRC in r2 but it needs them to point the last bytes of + sub #1, r2 ; the regions involved not the first bytes, hence these + sub #1, r1 ; additions and subtractions. + smovb + bra 1b |