62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/* Copyright (c) 2015 Nordic Semiconductor. All Rights Reserved.
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*
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* The information contained herein is property of Nordic Semiconductor ASA.
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* Terms and conditions of usage are described in detail in NORDIC
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* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
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*
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* Licensees are granted free, non-transferable use of the information. NO
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* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
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* the file.
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*
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*/
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#include <stdint.h>
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//lint -save -e27 -e10 -e19 -e40
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extern char STACK$$Base;
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/* This variable should be static but then it cannot be used in assembly code below.
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* The problem here is that the address of the section can be archived by $$ operator
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* that is not allowed in assembly code. */
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char const * HardFault_Handler_stack_bottom = &STACK$$Base;
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//lint -restore
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__asm void HardFault_Handler(void)
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{
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PRESERVE8
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EXTERN HardFault_c_handler
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EXTERN __initial_sp
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EXTERN HardFault_Handler_stack_bottom
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ldr r0, =0xFFFFFFFD
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cmp r0, lr
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bne HardFault_Handler_ChooseMSP
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/* Reading PSP into R0 */
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mrs r0, PSP
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b HardFault_Handler_Continue
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HardFault_Handler_ChooseMSP
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/* Reading MSP into R0 */
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mrs r0, MSP
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/* -----------------------------------------------------------------
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* If we have selected MSP, check if we may use stack safely.
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* If not - reset the stack to the initial value. */
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ldr r1, =__initial_sp
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ldr r2, =HardFault_Handler_stack_bottom
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ldr r2, [r2]
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/* MSP is in the range of <__StackTop, __StackLimit) */
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cmp r0, r1
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bhi HardFault_MoveSP
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cmp r0, r2
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bhi HardFault_Handler_Continue
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/* ----------------------------------------------------------------- */
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HardFault_MoveSP
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mov SP, r1
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movs r0, #0
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HardFault_Handler_Continue
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ldr r3, =HardFault_c_handler
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bx r3
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ALIGN
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}
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