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authorAryadev Chavali <aryadev@aryadevchavali.com>2023-11-03 07:55:23 +0000
committerAryadev Chavali <aryadev@aryadevchavali.com>2023-11-03 07:55:23 +0000
commitb4fce03177df15f200950591922298892f62a60e (patch)
treed0110f8eac8ec3f7336f9b241bcbe3371d6c252d /examples
parentfc4b9702d21b594268220ea761a390ff87c932e0 (diff)
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Made test.asm an example asm program
Diffstat (limited to 'examples')
-rw-r--r--examples/memory-print.asm64
1 files changed, 64 insertions, 0 deletions
diff --git a/examples/memory-print.asm b/examples/memory-print.asm
new file mode 100644
index 0000000..ed32b7a
--- /dev/null
+++ b/examples/memory-print.asm
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+;;; memory-print: An example program that features a subroutine for
+;;; printing a memory buffer, of any length, as characters.
+ ;; Allocate a buffer of 3 characters
+ malloc.byte 3
+ mov.word 0
+ ;; Setup the buffer to be equivalent to "abc"
+ push.reg.word 0
+ push.byte 'a'
+ mset.byte 0
+ push.reg.word 0
+ push.byte 'b'
+ mset.byte 1
+ push.reg.word 0
+ push.byte 'c'
+ mset.byte 2
+
+ ;; Save buffer to W[8] because the first 8 registers should be
+ ;; reserved for library routines as it may be overwritten
+ push.reg.word 0
+ mov.word 8
+
+ push.reg.word 0
+ ;; Call the routine
+ call print_cptr
+
+ ;; Delete allocated buffer
+ push.reg.word 8
+ mdelete
+
+ halt
+
+;;; print_cptr: Prints pointer to a buffer of characters. Pointer
+;;; should be on the stack as a word.
+print_cptr:
+ ;; Save pointer in layout to W[0], P -> W[0]
+ mov.word 0
+ ;; iterator I -> W[1]
+ push.word 0
+ mov.word 1
+ ;; (W[0])[W[1]] -> P[I]
+ push.reg.word 0 ; <-- #
+ push.reg.word 1
+ mget.stack.byte
+ print.char
+
+ ;; I += 1
+ push.reg.word 1
+ push.word 1
+ plus.word
+ mov.word 1
+
+ ;; if I != |P| ...
+ push.reg.word 1
+ push.reg.word 0
+ msize
+ eq.word
+ not.byte
+ ;; then go to #
+ jump.if.byte *-13
+ ;; else print a newline
+ push.byte '\n'
+ print.char
+ ;; return back to the caller
+ ret