diff options
Diffstat (limited to 'newlib/libc/machine/h8300/reg_memcpy.S')
| -rw-r--r-- | newlib/libc/machine/h8300/reg_memcpy.S | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/newlib/libc/machine/h8300/reg_memcpy.S b/newlib/libc/machine/h8300/reg_memcpy.S new file mode 100644 index 0000000..772a43c --- /dev/null +++ b/newlib/libc/machine/h8300/reg_memcpy.S @@ -0,0 +1,33 @@ +#include "defines.h" + +#ifdef __H8300H__ + .h8300h +#endif + +#ifdef __H8300S__ + .h8300s +#endif + + + ; dst A0 + ; src A1 + ; len A2 + .global ___reg_memcpy +___reg_memcpy: + + MOVP A0P,A3P ; keep copy of result + ADDP A2P,A0P ; point to end of dst + ADDP A2P,A1P ; point to end of src + CMPP A0P,A3P ; see if anything to do + beq quit + + +loop: subs #1,A1P ; point to byte + mov.b @A1P,A2L ; get byte + mov.b A2L,@-A0P ; save byte + CMPP A0P,A3P ; at the front again ? + bne loop + + ; return with A0 pointing to dst +quit: rts + |