65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/*
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* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include "hardware/exception.h"
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#include "hardware/regs/m0plus.h"
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#include "hardware/platform_defs.h"
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#include "hardware/structs/scb.h"
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#include "pico/mutex.h"
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#include "pico/assert.h"
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#ifndef exception_is_compile_time_default
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static bool exception_is_compile_time_default(exception_handler_t handler) {
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extern char __default_isrs_start;
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extern char __default_isrs_end;
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return ((uintptr_t)handler) >= (uintptr_t)&__default_isrs_start &&
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((uintptr_t)handler) < (uintptr_t)&__default_isrs_end;
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}
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#endif
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static inline exception_handler_t *get_vtable(void) {
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return (exception_handler_t *) scb_hw->vtor;
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}
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static void set_raw_exception_handler_and_restore_interrupts(enum exception_number num, exception_handler_t handler, uint32_t save) {
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// update vtable (vtable_handler may be same or updated depending on cases, but we do it anyway for compactness)
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get_vtable()[16 + num] = handler;
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__dmb();
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restore_interrupts(save);
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}
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static inline void check_exception_param(__unused enum exception_number num) {
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invalid_params_if(EXCEPTION, num < NMI_EXCEPTION || num >=0);
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}
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exception_handler_t exception_get_vtable_handler(enum exception_number num) {
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check_exception_param(num);
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return get_vtable()[16 + num];
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}
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exception_handler_t exception_set_exclusive_handler(enum exception_number num, exception_handler_t handler) {
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check_exception_param(num);
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#if !PICO_NO_RAM_VECTOR_TABLE
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uint32_t save = save_and_disable_interrupts();
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exception_handler_t current = exception_get_vtable_handler(num);
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hard_assert(handler == current || exception_is_compile_time_default(current));
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set_raw_exception_handler_and_restore_interrupts(num, handler, save);
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#else
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panic_unsupported();
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#endif
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return current;
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}
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void exception_restore_handler(enum exception_number num, exception_handler_t original_handler) {
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hard_assert(exception_is_compile_time_default(original_handler));
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#if !PICO_NO_RAM_VECTOR_TABLE
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uint32_t save = save_and_disable_interrupts();
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set_raw_exception_handler_and_restore_interrupts(num, original_handler, save);
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#else
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panic_unsupported();
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#endif
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} |