107 lines
3.2 KiB
C++
107 lines
3.2 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, commerically 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 its use or misuse - this software is without warranty.
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***************************************************************************
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* File Description: Implementation of the memory tracking sub-system.
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**************************************************************************/
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#if defined(__arm__) || defined(__thumb__)
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#define MODULE_NAME "UNWARMMEM"
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#include <stdio.h>
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#include "unwarmmem.h"
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#include "unwarm.h"
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#define M_IsIdxUsed(a, v) !!((a)[v >> 3] & (1 << (v & 0x7)))
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#define M_SetIdxUsed(a, v) ((a)[v >> 3] |= (1 << (v & 0x7)))
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#define M_ClrIdxUsed(a, v) ((a)[v >> 3] &= ~(1 << (v & 0x7)))
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/** Search the memory hash to see if an entry is stored in the hash already.
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* This will search the hash and either return the index where the item is
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* stored, or -1 if the item was not found.
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*/
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static int16_t memHashIndex(MemData * const memData, const uint32_t addr) {
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const uint16_t v = addr % MEM_HASH_SIZE;
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uint16_t s = v;
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do {
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/* Check if the element is occupied */
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if (M_IsIdxUsed(memData->used, s)) {
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/* Check if it is occupied with the sought data */
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if (memData->a[s] == addr) return s;
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}
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else {
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/* Item is free, this is where the item should be stored */
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return s;
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}
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/* Search the next entry */
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s++;
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if (s > MEM_HASH_SIZE) s = 0;
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} while (s != v);
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/* Search failed, hash is full and the address not stored */
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return -1;
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}
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bool UnwMemHashRead(MemData * const memData, uint32_t addr,uint32_t * const data, bool * const tracked) {
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const int16_t i = memHashIndex(memData, addr);
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if (i >= 0 && M_IsIdxUsed(memData->used, i) && memData->a[i] == addr) {
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*data = memData->v[i];
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*tracked = M_IsIdxUsed(memData->tracked, i);
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return true;
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}
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else {
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/* Address not found in the hash */
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return false;
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}
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}
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bool UnwMemHashWrite(MemData * const memData, uint32_t addr, uint32_t val, bool valValid) {
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const int16_t i = memHashIndex(memData, addr);
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if (i < 0) return false; /* Hash full */
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/* Store the item */
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memData->a[i] = addr;
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M_SetIdxUsed(memData->used, i);
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if (valValid) {
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memData->v[i] = val;
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M_SetIdxUsed(memData->tracked, i);
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}
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else {
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#ifdef UNW_DEBUG
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memData->v[i] = 0xDEADBEEF;
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#endif
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M_ClrIdxUsed(memData->tracked, i);
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}
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return true;
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}
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void UnwMemHashGC(UnwState * const state) {
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const uint32_t minValidAddr = state->regData[13].v;
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MemData * const memData = &state->memData;
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uint16_t t;
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for (t = 0; t < MEM_HASH_SIZE; t++) {
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if (M_IsIdxUsed(memData->used, t) && (memData->a[t] < minValidAddr)) {
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UnwPrintd3("MemHashGC: Free elem %d, addr 0x%08x\n", t, memData->a[t]);
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M_ClrIdxUsed(memData->used, t);
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}
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}
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}
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#endif // __arm__ || __thumb__
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