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Add PICO_MINIMAL_VECTOR_TABLE compile option #2233

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Add PICO_MINIMAL_VECTOR_TABLE compile option #2233

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13 changes: 13 additions & 0 deletions src/rp2_common/pico_crt0/crt0.S
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Original file line number Diff line number Diff line change
Expand Up @@ -26,11 +26,21 @@ pico_default_asm_setup
.section .vectors, "ax"
.align 2

// PICO_CONFIG: PICO_MINIMAL_VECTOR_TABLE, Use Minimal Vector Table - this prevents use of all interrupts, type=bool, default=0, advanced=true, group=pico_crt0
#ifndef PICO_MINIMAL_VECTOR_TABLE
#define PICO_MINIMAL_VECTOR_TABLE 0
#endif

.global __vectors, __VECTOR_TABLE
__VECTOR_TABLE:
__vectors:
.word __StackTop
.word _reset_handler

#if PICO_MINIMAL_VECTOR_TABLE
.word isr_invalid // NMI
.word isr_invalid // HardFault
#else
.word isr_nmi
.word isr_hardfault
.word isr_invalid // Reserved, should never fire
Expand Down Expand Up @@ -146,6 +156,7 @@ if_irq_word 79 isr_irq79
#error more IRQ entries required
#endif
#endif
#endif // #if !PICO_MINIMAL_VECTOR_TABLE

// all default exception handlers do nothing, and we can check for them being set to our
// default values by seeing if they point to somewhere between __defaults_isrs_start and __default_isrs_end
Expand All @@ -166,6 +177,7 @@ __default_isrs_start:

// these are separated out for clarity
decl_isr_bkpt isr_invalid
#if !PICO_MINIMAL_VECTOR_TABLE
decl_isr_bkpt isr_nmi
decl_isr_bkpt isr_hardfault
decl_isr_bkpt isr_svcall
Expand Down Expand Up @@ -287,6 +299,7 @@ __unhandled_user_irq:
.global unhandled_user_irq_num_in_r0
unhandled_user_irq_num_in_r0:
bkpt #0
#endif // #if !PICO_MINIMAL_VECTOR_TABLE

// ----------------------------------------------------------------------------

Expand Down