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-rw-r--r--examples/bf.s462
1 files changed, 462 insertions, 0 deletions
diff --git a/examples/bf.s b/examples/bf.s
new file mode 100644
index 0000000..9a0de0f
--- /dev/null
+++ b/examples/bf.s
@@ -0,0 +1,462 @@
+SET PC, init
+:code_start
+dat ">++++++++++>+>+["
+dat "[+++++[>++++++++<-]>.<++++++[>--------<-]+<<<]>.>>["
+dat "[-]<[>+<-]>>[<<+>+>-]<[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-"
+dat "[>+<-[>+<-[>+<-[>[-]>+>+<<<-[>+<-]]]]]]]]]]]+>>>"
+dat "]<<<"
+dat "]"
+:code_end
+
+:screen_hwi dat 0
+:kb_hwi dat 1
+:screen_start dat 0x8000
+
+:screen_cursor dat 0
+
+:inst_dec_pointer dat 60
+:inst_dec_value dat 45
+:inst_inc_pointer dat 62
+:inst_inc_value dat 43
+:inst_input dat 44
+:inst_jump_backward dat 93
+:inst_jump_forward dat 91
+:inst_output dat 46
+
+:init
+
+SET A, 0
+SET B, [screen_start]
+HWI [screen_hwi]
+
+SET A,0
+HWI [kb_hwi]
+
+SET PC, start
+
+:start
+
+JSR build_jump_map
+
+SET A, code_start
+SET C, mem_start
+
+:emu_loop
+ IFE A, code_end
+ SET PC, emu_loop_exit
+ JSR emu_step
+
+ ADD A, 1
+ SET PC, emu_loop
+
+ :emu_loop_exit
+ SUB PC, 1
+
+:emu_step
+ IFN [A], [inst_dec_pointer]
+ SET PC, end_inst_dec_pointer
+ JSR emu_handle_inst_dec_pointer
+ SET PC, emu_step_exit
+ :end_inst_dec_pointer
+
+ IFN [A], [inst_dec_value]
+ SET PC, end_inst_dec_value
+ JSR emu_handle_inst_dec_value
+ SET PC, emu_step_exit
+ :end_inst_dec_value
+
+ IFN [A], [inst_inc_pointer]
+ SET PC, end_inst_inc_pointer
+ JSR emu_handle_inst_inc_pointer
+ SET PC, emu_step_exit
+ :end_inst_inc_pointer
+
+ IFN [A], [inst_inc_value]
+ SET PC, end_inst_inc_value
+ JSR emu_handle_inst_inc_value
+ SET PC, emu_step_exit
+ :end_inst_inc_value
+
+ IFN [A], [inst_output]
+ SET PC, end_inst_output
+ JSR emu_handle_inst_output
+ SET PC, emu_step_exit
+ :end_inst_output
+
+ IFN [A], [inst_input]
+ SET PC, end_inst_input
+ JSR emu_handle_inst_input
+ SET PC, emu_step_exit
+ :end_inst_input
+
+ IFN [A], [inst_jump_forward]
+ SET PC, end_inst_jump_forward
+ JSR emu_handle_inst_jump_forward
+ SET PC, emu_step_exit
+ :end_inst_jump_forward
+
+ IFN [A], [inst_jump_backward]
+ SET PC, end_inst_jump_backward
+ JSR emu_handle_inst_jump_backward
+ SET PC, emu_step_exit
+ :end_inst_jump_backward
+
+ :emu_step_exit
+ SET PC, POP
+
+:emu_handle_inst_dec_pointer
+ SUB C, 1
+ IFL C, mem_start
+ SET C, mem_end
+ SET PC, POP
+
+:emu_handle_inst_dec_value
+ SET X, [C]
+ SUB X, 1
+ SET [C], x
+ SET PC, POP
+
+:emu_handle_inst_inc_pointer
+ ADD C, 1
+ IFG C, mem_end
+ SET C, mem_start
+ SET PC, POP
+
+:emu_handle_inst_inc_value
+ SET X, [C]
+ ADD X, 1
+ SET [C], x
+ SET PC, POP
+
+:emu_handle_inst_output
+ SET PUSH, A
+ SET A, [C]
+ SET B, [screen_cursor]
+
+ IFL B, 384
+ SET PC, inst_output_func_start
+ ;;scroll screen
+ JSR scroll
+ SUB B, 0x20
+
+ :inst_output_func_start
+
+ IFE A, 10 ;;new line
+ SET PC, inst_output_newline
+
+ SET PC, inst_output_draw
+
+ :inst_output_newline
+ ;; is a new line
+ SET PUSH, X
+ SET PUSH, Y
+ SET X, B
+ SET Y, 32
+ MOD X, Y
+ SET Y, 31
+ SUB Y, X
+ ADD B, Y
+ SET Y, POP
+ SET X, POP
+ SET PC, inst_output_func_end
+
+ :inst_output_draw
+ JSR print_char
+
+ :inst_output_func_end
+ SET A, POP
+ ADD B, 1
+ SET [screen_cursor], B
+ SET PC, POP
+
+:emu_handle_inst_input
+ JSR getc
+ SET [C], X
+ SET PC, POP
+
+:emu_handle_inst_jump_forward
+ IFN [C], 0
+ SET PC, POP
+
+ SUB A, code_start
+ JSR get_forward_jump
+ ADD A, code_start
+ SET PC, POP
+
+:emu_handle_inst_jump_backward
+ IFE [C], 0
+ SET PC, POP
+
+ SUB A, code_start
+ JSR get_backwards_jump
+ ADD A, code_start
+ SET PC, POP
+
+;A - jump bracket relative location
+:get_forward_jump
+ SET PUSH, B
+ SET B, A
+ SET A, rel_map_start
+ :get_forward_jump_loop
+ IFE A, rel_map_end
+ SET PC, get_forward_jump_end
+ IFE [A], B
+ SET PC, get_forward_jump_found
+
+ ADD A, 1
+ SET PC, get_forward_jump_loop
+
+ :get_forward_jump_found
+ SET A, [A + 1]
+
+ :get_forward_jump_end
+ SET B, POP
+ SET PC, POP
+
+;A - jump bracket relative location
+:get_backwards_jump
+ SET PUSH, B
+ SET B, A
+ SET A, rel_map_start
+ :get_backwards_jump_loop
+ IFE A, rel_map_end
+ SET PC, get_backwards_jump_end
+ IFE [A], B
+ SET PC, get_backwards_jump_found
+
+ ADD A, 1
+ SET PC, get_backwards_jump_loop
+
+ :get_backwards_jump_found
+ SET B, A
+ SUB B, 1
+ SET A, [B]
+
+ :get_backwards_jump_end
+ SET B, POP
+ SET PC, POP
+
+:build_jump_map
+ SET PUSH, A
+ SET PUSH, B
+ SET A, code_start
+ SET B, rel_map_start
+ :build_jump_map_loop
+ IFE A, code_end
+ SET PC, end_build_jump_map_loop
+ IFE [A], [inst_jump_forward]
+ SET PUSH, A
+ IFN [A], [inst_jump_backward]
+ SET PC, end_build_jump_map_inst_jump_backward ;flipped
+ ; A - end c - start
+ SET C, POP
+
+ SUB C, code_start
+ ;got relative start
+ SET X, C
+
+ SET C, A
+ SUB C, code_start
+ ;got relative end
+ SET Y, C
+
+ SET [B], X
+ SET [B + 1], Y
+
+ ADD B, 2
+ :end_build_jump_map_inst_jump_backward
+
+ ADD A, 1
+ SET PC, build_jump_map_loop
+ :end_build_jump_map_loop
+ SET B, POP
+ SET A, POP
+ SET PC, POP
+
+:getc
+ ;Parameters
+ ;None.
+ ;Returns
+ ;X - Char value
+
+ ;Don't clobber our environment...
+ SET PUSH, A
+ SET PUSH, C
+
+ :getc_loop
+ SET A, 1
+ HWI [kb_hwi]
+
+ IFE C, 0x0000
+ SET PC, getc_loop
+
+ SET X, C
+ SET C, POP
+ SET A, POP
+ SET PC, POP
+
+;A - char
+;B - location
+:print_char
+ SET PUSH, B
+ SET PUSH, C
+ ADD B, [screen_start]
+ SET C, 0xf000
+ ADD C, A
+ SET [B], C
+ SET C, POP
+ SET B, POP
+ SET PC, POP
+
+:scroll
+ SET PUSH, A
+ SET PUSH, B
+ SET A, [screen_start]
+ SET B, A
+ ADD B, 384
+
+ :scroll_loop
+ IFE A, B
+ SET PC, scroll_end
+ SET [A], [A + 32]
+ ADD A, 1
+ SET PC, scroll_loop
+ :scroll_end
+ ;blank last line
+ SET A, 11
+ MUL A, 32
+ ADD A, [screen_start]
+ :scroll_end_loop
+ IFE A, B
+ SET PC, scroll_end_loop_end
+ SET [A], 0
+ ADD A, 1
+ SET PC, scroll_end_loop
+ :scroll_end_loop_end
+ SET B, POP
+ SET A, POP
+ SET PC, POP
+
+:mem_start
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+:mem_end
+
+:rel_map_start
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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+:rel_map_end