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53 lines
2.0 KiB
C
53 lines
2.0 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "riscv/rvruntime-frames.h"
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#include "esp_private/panic_internal.h"
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#define MCAUSE_ILLEGAL_INSTRUCTION 2
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extern void esp_panic_handler(panic_info_t *info);
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volatile bool g_override_illegal_instruction = false;
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void __real_esp_panic_handler(panic_info_t *info);
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void return_from_panic_handler(RvExcFrame *frm) __attribute__((noreturn));
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/* Memprot test specific IllegalInstruction exception handler:
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* when testing the protection against a code execution, sample code
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* is being injected into various memory regions which produces
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* Illegal instruction on execution attempt. Such a result is expected
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* but it causes system reboot in the standard panic handler.
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* The following variant of panic handling simply returns back to the
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* next instruction and continues normal execution.
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*
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* NOTE: if Illegal instruction comes from a different source than the testing code
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* the behavior is undefined
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* */
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void __wrap_esp_panic_handler(panic_info_t *info)
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{
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RvExcFrame *frm = (RvExcFrame *)info->frame;
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if ( frm->mcause == MCAUSE_ILLEGAL_INSTRUCTION && g_override_illegal_instruction == true ) {
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/* Return from exception to the return address that called the faulting function.
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*/
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frm->mepc = frm->ra;
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/* Restore the CPU state and return from the exception.
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*/
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return_from_panic_handler(frm);
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} else {
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__real_esp_panic_handler(info);
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}
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}
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