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Perry Kivolowitz 2022-12-11 10:29:43 -06:00
parent 3834b607ab
commit e394b9c34d
1 changed files with 62 additions and 1 deletions
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63
projects/snow/main.s
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@ -7,7 +7,9 @@
.equ MAX_LINE, 24
.equ MAX_LINE_X2, 48
storm .req x27
storm .req x27 // base address of storm
estorm .req x28 // end of storm
main: stp x29, x30, [sp, -16]!
stp x27, x28, [sp, -16]!
@ -36,10 +38,20 @@ main: stp x29, x30, [sp, -16]!
1: mov storm, x0 // The base address of the
// allocated memory will be
// preserved in x27.
mov estorm, x0 // prep end of storm calculation
ldr x2, [sp], 16 // Restore the allocation size.
add estorm, estorm, x2 // Preserve end-of-storm.
mov w1, wzr // Fill with zero.
bl memset // x0 still had base address.
bl InitializeStorm
10: bl Erase
bl StepAll
bl RenderAll
bl Delay
b 10b
99: mov x0, storm
bl free
@ -49,6 +61,53 @@ bye: ldp x27, x28, [sp], 16
ldp x20, x30, [sp], 16
ret
/* line comes to us in w0
column comes to us in w1
*/
Move: stp x20, x30, [sp, -16]!
mov w2, w1
mov w1, w0
ldr x0, =move_str
bl printf
ldp x20, x30, [sp], 16
ret
Erase: stp x20, x30, [sp, -16]!
mov w0, 1
mov w1, 1
bl Move
ldr x0, =erase_str
bl printf
ldp x20, x30, [sp], 16
ret
RenderOne:
ret
RenderAll:
ret
Delay:
ret
StepOne:
ret
StepAll:
ret
InitializeStorm:
stp x20, x30, [sp, -16]!
mov x20, storm
1: mov x0, x20
bl ResetFlake
add x20, x20, Flake.size
cmp estorm, x20
bne 1b
ldp x20, x30, [sp], 16
ret
/* x0 contains the address of a Flake in need of being reset.
The column number of a Flake is anywhere from 1 to 80 (a
default terminal). The starting line is anywhere from 1 to
@ -100,6 +159,8 @@ mod: sdiv x2, x0, x1 // x2 gets a // b
.data
bad_malloc: .asciz "Allocation of flakes has failed"
move_str: .asciz "\033[%d;%dH"
erase_str: .asciz "\033[2J"
.section Flake
.struct 0