elna/tools/builtin.s

51 lines
752 B
ArmAsm

.global printi
.type printi, @function
.global _start
.type _start, @function
.text
printi:
addi sp, sp, -16
sw s0, 0(sp)
sw ra, 4(sp)
addi s0, sp, 16
addi t1, zero, '\n'
sb t1, -1(s0)
# t0 - Whole number.
# t1 - Constant 10.
# a1 - Local buffer.
# t2 - Current character.
lw t0, 0(s0)
addi t1, zero, 10
addi a1, s0, -2
.digit10:
rem t2, t0, t1
addi t2, t2, '0'
sb t2, 0(a1)
div t0, t0, t1
addi a1, a1, -1
bne zero, t0, .digit10
ecall
addi a0, zero, 1
addi a1, a1, 1
sub a2, s0, a1
addi a7, zero, 64
ecall
lw s0, 0(sp)
lw ra, 4(sp)
addi sp, sp, 16
ret
_start:
call main
addi a0, zero, 0
addi a7, zero, 93
ecall