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41 lines
749 B
ArmAsm
41 lines
749 B
ArmAsm
.file "key_onoff.c"
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.text
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.align 2
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.global _start
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.type _start,function
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_start:
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mov r0, #0x4000000
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ldr r0, [r0, #0x130] @ r0 = read_io(0x4000130)
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ldrh r1, [pc, #0x3c] @ r1 = 0x384 key:L+R+D+SEL
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ldrh r2, [pc, #0x3a] @ r2 = 0x3ff
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and r0, r0, r2 @ r0 = r0 & 0x3ff
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ldr r2, [pc, #0x34] @ r2 = static_addr(isOn)
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ldrb r3, [r2] @ r3 = *isOn
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cmp r0, r1
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beq _mark
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@ if r0 != key
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ands r1, r3, #0x10
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andne r3, r3, #0xf
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strneb r3, [r2] @ if r3 & 0x10 then *isOn = r3 & 0xf end
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_final:
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cmp r3, #0
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bne _next
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bx lr
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_mark: @ else // r0 == key
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ands r1, r3, #0x10
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eoreq r3, r3, #0x11
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streqb r3, [r2] @ if r3 & 0x10 == 0 then *isOn = !r3 | 0x10 end
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b _final
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_const:
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.long 0x03ff0384
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.long 0
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_next:
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.long 0xFFFFFFFF
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