kopia lustrzana https://github.com/espressif/esp-idf
44 wiersze
1.7 KiB
C
44 wiersze
1.7 KiB
C
|
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
#include "freertos/xtensa_context.h"
|
||
|
|
#include "esp_private/panic_internal.h"
|
||
|
|
|
||
|
|
extern void esp_panic_handler(panic_info_t *info);
|
||
|
|
extern volatile bool g_override_illegal_instruction;
|
||
|
|
|
||
|
|
void __real_esp_panic_handler(panic_info_t *info);
|
||
|
|
|
||
|
|
/* Memprot test specific IllegalInstruction exception handler:
|
||
|
|
* when testing the protection against a code execution, sample code
|
||
|
|
* is being injected into various memory regions which produces
|
||
|
|
* EXCCAUSE_ILLEGAL on execution attempt. Such a result is expected
|
||
|
|
* but it causes system reboot in the standard panic handler.
|
||
|
|
* The following variant of panic handling simply returns back to the
|
||
|
|
* next instruction and continues normal execution.
|
||
|
|
*
|
||
|
|
* NOTE: if EXCCAUSE_ILLEGAL comes from a different source than the testing code
|
||
|
|
* the behavior is undefined
|
||
|
|
* */
|
||
|
|
void __wrap_esp_panic_handler(panic_info_t *info)
|
||
|
|
{
|
||
|
|
XtExcFrame *frm = (XtExcFrame *)info->frame;
|
||
|
|
if ( frm->exccause == EXCCAUSE_ILLEGAL && g_override_illegal_instruction == true ) {
|
||
|
|
frm->pc = frm->a0;
|
||
|
|
return;
|
||
|
|
} else {
|
||
|
|
__real_esp_panic_handler(info);
|
||
|
|
}
|
||
|
|
}
|