diff options
Diffstat (limited to 'atk16_asm/builtin_asm')
| -rw-r--r-- | atk16_asm/builtin_asm/std_mem.atk16 | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/atk16_asm/builtin_asm/std_mem.atk16 b/atk16_asm/builtin_asm/std_mem.atk16 new file mode 100644 index 0000000..4c6a455 --- /dev/null +++ b/atk16_asm/builtin_asm/std_mem.atk16 @@ -0,0 +1,19 @@ +@label memset + ; sets a specified number of words in memory to a specified value + ; parameters: RA = offset (offset in memory to start at) + ; RB = n (number of words to set) + ; RC = val (value to set the words to) + ; returns: void + stack_stash RD RE + ldi 0 RD ; RD := i (counter), initially 0 +@label memset_loop + subi RB RD RE ; RE := n – i (unused value) + bri zero memset_done ; exit the loop + + add RA RD RE ; RE := RA + i (address of the word to set) + str RC RE ; set the word at address RE to value in RC + + inc RD ; i := i + 1 +@label memset_done + stack_restore RD RE + return |