99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/***************************************************************************
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* ARM Stack Unwinder, Michael.McTernan.2001@cs.bris.ac.uk
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* Updated, adapted and several bug fixes on 2018 by Eduardo José Tagle
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*
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* This program is PUBLIC DOMAIN.
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* This means that there is no copyright and anyone is able to take a copy
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* for free and use it as they wish, with or without modifications, and in
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* any context, commercially or otherwise. The only limitation is that I
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* don't guarantee that the software is fit for any purpose or accept any
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* liability for it's use or misuse - this software is without warranty.
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***************************************************************************
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* File Description: Implementation of the interface into the ARM unwinder.
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**************************************************************************/
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#ifdef ARDUINO_ARCH_SAM
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#define MODULE_NAME "UNWINDER"
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#include <stdio.h>
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#include <string.h>
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#include "unwinder.h"
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#include "unwarm.h"
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#include "unwarmbytab.h"
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/* These symbols point to the start and end of stack */
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extern const int _sstack;
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extern const int _estack;
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/* These symbols point to the start and end of the code section */
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extern const int _sfixed;
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extern const int _efixed;
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/* These symbols point to the start and end of initialized data (could be SRAM functions!) */
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extern const int _srelocate;
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extern const int _erelocate;
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/* Validate stack pointer (SP): It must be in the stack area */
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static inline __attribute__((always_inline)) UnwResult validate_sp(const void* sp) {
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// SP must point into the allocated stack area
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if ((uint32_t)sp >= (uint32_t)&_sstack && (uint32_t)sp <= (uint32_t)&_estack)
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return UNWIND_SUCCESS;
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return UNWIND_INVALID_SP;
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}
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/* Validate code pointer (PC): It must be either in TEXT or in SRAM */
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static inline __attribute__((always_inline)) UnwResult validate_pc(const void* pc) {
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// PC must point into the text (CODE) area
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if ((uint32_t)pc >= (uint32_t)&_sfixed && (uint32_t)pc <= (uint32_t)&_efixed)
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return UNWIND_SUCCESS;
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// Or into the SRAM function area
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if ((uint32_t)pc >= (uint32_t)&_srelocate && (uint32_t)pc <= (uint32_t)&_erelocate)
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return UNWIND_SUCCESS;
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return UNWIND_INVALID_PC;
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}
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/* These symbols point to the unwind index and should be provide by the linker script */
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extern const UnwTabEntry __exidx_start[];
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extern const UnwTabEntry __exidx_end[];
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// Detect if unwind information is present or not
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static int HasUnwindTableInfo(void) {
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return ((char*)(&__exidx_end) - (char*)(&__exidx_start)) > 16 ? 1 : 0; // 16 because there are default entries we can´t supress
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}
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UnwResult UnwindStart(UnwindFrame* frame, const UnwindCallbacks *cb, void *data)
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{
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if (HasUnwindTableInfo()) {
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/* We have unwind information tables */
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return UnwindByTableStart(frame, cb, data);
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} else {
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/* We don't have unwind information tables */
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UnwState state;
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/* Initialise the unwinding state */
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UnwInitState(&state, cb, data, frame->pc, frame->sp);
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/* Check the Thumb bit */
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if(frame->pc & 0x1) {
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return UnwStartThumb(&state);
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}
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else {
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return UnwStartArm(&state);
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}
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}
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}
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#endif
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