# puts a string literal into the .data segment and loads its address
# into a register. use like:
# lstr a0, “hello, world”
.macro lstr %rd, %str
.data
lstr_message: .asciiz %str
.text
la %rd, lstr_message
.end_macro
# print a string to the console. PRESERVES A0 AND V0.
.macro print_str %str
push a0
push v0
lstr a0, %str
syscall_print_string
pop v0
pop a0
.end_macro
# print a newline to the console. PRESERVES A0 AND V0.
.macro newline
push a0
push v0
li a0, ‘\n’
syscall_print_char
pop v0
pop a0
.end_macro
# print a string to the console, followed by a newline. PRESERVES A0 AND V0.
.macro println_str %str
print_str %str
newline
.end_macro
# increment the value in a register by 1.
.macro inc %reg
addi %reg, %reg, 1
.end_macro
# decrement the value in a register by 1.
.macro dec %reg
addi %reg, %reg, -1
.end_macro
# set rd to the minimum of register rs and register rt.
.macro min %rd, %rs, %rt
move %rd, %rs
blt %rs, %rt, _end
move %rd, %rt
_end:
.end_macro
# set rd to the minimum of register rs and immediate imm.
.macro mini %rd, %rs, %imm
move %rd, %rs
blt %rs, %imm, _end
li %rd, %imm
_end:
.end_macro
# set rd to the maximum of register rs and register rt.
.macro max %rd, %rs, %rt
move %rd, %rs
bgt %rs, %rt, _end
move %rd, %rt
_end:
.end_macro
# set rd to the maximum of register rs and immediate imm.
.macro maxi %rd, %rs, %imm
move %rd, %rs
bgt %rs, %imm, _end
li %rd, %imm
_end:
.end_macro
# these let you do the syscall on a single line.
# these all trash v0.
.macro syscall_print_int
li v0, 1
syscall
.end_macro
.macro syscall_print_float
li v0, 2
syscall
.end_macro
.macro syscall_print_double
li v0, 3
syscall
.end_macro
.macro syscall_print_string
li v0, 4
syscall
.end_macro
.macro syscall_read_int
li v0, 5
syscall
.end_macro
.macro syscall_read_float
li v0, 6
syscall
.end_macro
.macro syscall_read_double
li v0, 7
syscall
.end_macro
.macro syscall_read_string
li v0, 8
syscall
.end_macro
.macro syscall_exit
li v0, 10
syscall
.end_macro
.macro syscall_print_char
li v0, 11
syscall
.end_macro
.macro syscall_read_char
li v0, 12
syscall
.end_macro
.macro syscall_time
li v0, 30
syscall
.end_macro
.macro syscall_midi_out
li v0, 31
syscall
.end_macro
.macro syscall_sleep
li v0, 32
syscall
.end_macro
.macro syscall_midi_out_sync
li v0, 33
syscall
.end_macro
.macro syscall_print_hex
li v0, 34
syscall
.end_macro
.macro syscall_print_bin
li v0, 35
syscall
.end_macro
.macro syscall_print_uint
li v0, 36
syscall
.end_macro
.macro syscall_seed_rand
li v0, 40
syscall
.end_macro
.macro syscall_rand_int
li v0, 41
syscall
.end_macro
.macro syscall_rand_range
li v0, 42
syscall
.end_macro
# these all push ra as well as any registers you list after them.
# so “enter s0, s1” will save ra, s0, and s1, letting you use those s regs.
.macro enter
addi sp, sp, -4
sw ra, 0(sp)
.end_macro
.macro enter %r1
addi sp, sp, -8
sw ra, 0(sp)
sw %r1, 4(sp)
.end_macro
.macro enter %r1, %r2
addi sp, sp, -12
sw ra, 0(sp)
sw %r1, 4(sp)
sw %r2, 8(sp)
.end_macro
.macro enter %r1, %r2, %r3
addi sp, sp, -16
sw ra, 0(sp)
sw %r1, 4(sp)
sw %r2, 8(sp)
sw %r3, 12(sp)
.end_macro
.macro enter %r1, %r2, %r3, %r4
addi sp, sp, -20
sw ra, 0(sp)
sw %r1, 4(sp)
sw %r2, 8(sp)
sw %r3, 12(sp)
sw %r4, 16(sp)
.end_macro
.macro enter %r1, %r2, %r3, %r4, %r5
addi sp, sp, -24
sw ra, 0(sp)
sw %r1, 4(sp)
sw %r2, 8(sp)
sw %r3, 12(sp)
sw %r4, 16(sp)
sw %r5, 20(sp)
.end_macro
.macro enter %r1, %r2, %r3, %r4, %r5, %r6
addi sp, sp, -28
sw ra, 0(sp)
sw %r1, 4(sp)
sw %r2, 8(sp)
sw %r3, 12(sp)
sw %r4, 16(sp)
sw %r5, 20(sp)
sw %r6, 24(sp)
.end_macro
# the counterpart to enter. these pop the registers, and ra, and then return.
.macro leave
lw ra, 0(sp)
addi sp, sp, 4
jr ra
.end_macro
.macro leave %r1
lw ra, 0(sp)
lw %r1, 4(sp)
addi sp, sp, 8
jr ra
.end_macro
.macro leave %r1, %r2
lw ra, 0(sp)
lw %r1, 4(sp)
lw %r2, 8(sp)
addi sp, sp, 12
jr ra
.end_macro
.macro leave %r1, %r2, %r3
lw ra, 0(sp)
lw %r1, 4(sp)
lw %r2, 8(sp)
lw %r3, 12(sp)
addi sp, sp, 16
jr ra
.end_macro
.macro leave %r1, %r2, %r3, %r4
lw ra, 0(sp)
lw %r1, 4(sp)
lw %r2, 8(sp)
lw %r3, 12(sp)
lw %r4, 16(sp)
addi sp, sp, 20
jr ra
.end_macro
.macro leave %r1, %r2, %r3, %r4, %r5
lw ra, 0(sp)
lw %r1, 4(sp)
lw %r2, 8(sp)
lw %r3, 12(sp)
lw %r4, 16(sp)
lw %r5, 20(sp)
addi sp, sp, 24
jr ra
.end_macro
.macro leave %r1, %r2, %r3, %r4, %r5, %r6
lw ra, 0(sp)
lw %r1, 4(sp)
lw %r2, 8(sp)
lw %r3, 12(sp)
lw %r4, 16(sp)
lw %r5, 20(sp)
lw %r6, 24(sp)
addi sp, sp, 28
jr ra
.end_macro