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.syntax unified
.cpu cortex-m0plus
.thumb
.type main, %function
.global main, strbuf
main: LDR R4, =0x20002000
BL uart_recv
loop: BL prompt
LDR R0, inpbuf
BL getline
LDR R0, inpbuf
BL putstrln
LDR R1, inpbuf
LDR R2, strbuf
MOVS R0, 0
STRB R0, [R2]
BL statement
BNE bad
good: ADR R0, success
PUSH {R1}
BL putstrln
POP {R0}
BL putstrln
LDR R0, strbuf
BL putstrln
B loop
bad: ADR R0, fail
PUSH {R1}
BL putstrln
POP {R0}
BL putstrln
LDR R0, strbuf
BL putstrln
B loop
never: BL uart_recv
LDR R0, =0x20000001
BX R0
prompt: PUSH {LR}
MOVS R0, R4
BL send_hex
MOVS R0, '
BL uart_send
LDR R0, [R4]
BL send_hex
MOVS R0, '
BL uart_send
POP {PC}
.align 4
inpbuf: .word 0x20001F00 // TODO getline buffer overflow
strbuf: .word 0x20001F80
.align 4
success: .asciz "The parser suceeded"
.align 4
fail: .asciz "The parser failed"
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