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targets/gba: implement interrupt handler

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This commit is contained in:
Ayke van Laethem
2020-01-06 11:50:41 +01:00
parent 9d50587d63
commit ebde8b5875
7 changed files with 101 additions and 23 deletions
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targets/gameboy-advance.s
+15 -3
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@@ -17,9 +17,7 @@ _start:
.byte 0x00,0x00 // Checksum (80000BEh)
start_vector:
mov r0, #0x4000000 // REG_BASE
str r0, [r0, #0x208]
// Configure stacks
mov r0, #0x12 // Switch to IRQ Mode
msr cpsr, r0
ldr sp, =__sp_irq // Set IRQ stack
@@ -27,7 +25,21 @@ start_vector:
msr cpsr, r0
ldr sp, =__sp_usr // Set user stack
// Configure interrupt handler
mov r0, #0x4000000 // REG_BASE
ldr r1, =handleInterruptARM
str r1, [r0, #-4] // actually storing to 0x03007FFC due to mirroring
// Enable interrupts
mov r1, #1
str r1, [r0, #0x208] // 0x04000208 Interrupt Master Enable
// Jump to user code (switching to Thumb mode)
ldr r3, =main
bx r3
// Small interrupt handler that immediately jumps to a function defined in the
// program (in Thumb) for further processing.
handleInterruptARM:
ldr r0, =handleInterrupt
bx r0