target: Restructure internal break/watch handling.
cortexa: Implement soft breakpoints.
This commit is contained in:
Gareth McMullin
parent
9136cf4c98
commit
9aacc18f60
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@ -48,8 +48,8 @@ static void cortexa_reset(target *t);
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static enum target_halt_reason cortexa_halt_poll(target *t, target_addr *watch);
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static void cortexa_halt_request(target *t);
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static int cortexa_set_hw_bp(target *t, target_addr addr, uint8_t len);
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static int cortexa_clear_hw_bp(target *t, target_addr addr, uint8_t len);
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static int cortexa_breakwatch_set(target *t, struct breakwatch *);
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static int cortexa_breakwatch_clear(target *t, struct breakwatch *);
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static uint32_t bp_bas(uint32_t addr, uint8_t len);
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static void apb_write(target *t, uint16_t reg, uint32_t val);
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@ -68,7 +68,7 @@ struct cortexa_priv {
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uint64_t d[16];
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} reg_cache;
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unsigned hw_breakpoint_max;
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unsigned hw_breakpoint[16];
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bool hw_breakpoint[16];
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uint32_t bpc0;
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bool mmu_fault;
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};
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@ -393,8 +393,8 @@ bool cortexa_probe(ADIv5_AP_t *apb, uint32_t debug_base)
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t->halt_resume = cortexa_halt_resume;
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t->regs_size = sizeof(priv->reg_cache);
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t->set_hw_bp = cortexa_set_hw_bp;
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t->clear_hw_bp = cortexa_clear_hw_bp;
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t->breakwatch_set = cortexa_breakwatch_set;
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t->breakwatch_clear = cortexa_breakwatch_clear;
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return true;
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}
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@ -673,45 +673,75 @@ static uint32_t bp_bas(uint32_t addr, uint8_t len)
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return DBGBCR_BAS_LOW_HW;
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}
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static int cortexa_set_hw_bp(target *t, target_addr addr, uint8_t len)
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static int cortexa_breakwatch_set(target *t, struct breakwatch *bw)
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{
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struct cortexa_priv *priv = t->priv;
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unsigned i;
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switch (bw->type) {
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case TARGET_BREAK_SOFT:
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switch (bw->size) {
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case 2:
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bw->reserved[0] = target_mem_read16(t, bw->addr);
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target_mem_write16(t, bw->addr, 0xBE00);
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return 0;
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case 4:
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bw->reserved[0] = target_mem_read32(t, bw->addr);
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target_mem_write32(t, bw->addr, 0xE1200070);
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return 0;
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default:
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return -1;
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}
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case TARGET_BREAK_HARD:
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if ((bw->size != 4) && (bw->size != 2))
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return -1;
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for (i = 0; i < priv->hw_breakpoint_max; i++)
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if((priv->hw_breakpoint[i] & 1) == 0) break;
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if ((priv->hw_breakpoint[i] & 1) == 0)
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break;
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if(i == priv->hw_breakpoint_max) return -1;
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if (i == priv->hw_breakpoint_max)
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return -1;
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priv->hw_breakpoint[i] = addr | 1;
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bw->reserved[0] = i;
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apb_write(t, DBGBVR(i), addr & ~3);
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uint32_t bpc = bp_bas(addr, len) | DBGBCR_EN;
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priv->hw_breakpoint[i] = true;
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apb_write(t, DBGBVR(i), bw->addr & ~3);
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uint32_t bpc = bp_bas(bw->addr, bw->size) | DBGBCR_EN;
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apb_write(t, DBGBCR(i), bpc);
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if (i == 0)
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priv->bpc0 = bpc;
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return 0;
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default:
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return 1;
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}
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}
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static int cortexa_clear_hw_bp(target *t, target_addr addr, uint8_t len)
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static int cortexa_breakwatch_clear(target *t, struct breakwatch *bw)
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{
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struct cortexa_priv *priv = t->priv;
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unsigned i;
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(void)len;
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for (i = 0; i < priv->hw_breakpoint_max; i++)
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if ((priv->hw_breakpoint[i] & ~1) == addr)
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break;
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if (i == priv->hw_breakpoint_max)
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unsigned i = bw->reserved[0];
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switch (bw->type) {
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case TARGET_BREAK_SOFT:
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switch (bw->size) {
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case 2:
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target_mem_write16(t, bw->addr, i);
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return 0;
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case 4:
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target_mem_write32(t, bw->addr, i);
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return 0;
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default:
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return -1;
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priv->hw_breakpoint[i] = 0;
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}
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case TARGET_BREAK_HARD:
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priv->hw_breakpoint[i] = false;
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apb_write(t, DBGBCR(i), 0);
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if (i == 0)
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priv->bpc0 = 0;
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return 0;
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default:
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return 1;
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}
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}
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@ -56,12 +56,8 @@ static enum target_halt_reason cortexm_halt_poll(target *t, target_addr *watch);
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static void cortexm_halt_request(target *t);
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static int cortexm_fault_unwind(target *t);
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static int cortexm_set_hw_bp(target *t, target_addr addr, uint8_t len);
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static int cortexm_clear_hw_bp(target *t, target_addr addr, uint8_t len);
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static int cortexm_set_hw_wp(target *t, uint8_t type, target_addr addr, uint8_t len);
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static int cortexm_clear_hw_wp(target *t, uint8_t type, target_addr addr, uint8_t len);
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static int cortexm_breakwatch_set(target *t, struct breakwatch *);
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static int cortexm_breakwatch_clear(target *t, struct breakwatch *);
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static target_addr cortexm_check_watch(target *t);
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#define CORTEXM_MAX_WATCHPOINTS 4 /* architecture says up to 15, no implementation has > 4 */
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@ -74,15 +70,11 @@ struct cortexm_priv {
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bool stepping;
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bool on_bkpt;
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/* Watchpoint unit status */
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struct wp_unit_s {
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uint32_t addr;
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uint8_t type;
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uint8_t size;
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} hw_watchpoint[CORTEXM_MAX_WATCHPOINTS];
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bool hw_watchpoint[CORTEXM_MAX_WATCHPOINTS];
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unsigned flash_patch_revision;
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unsigned hw_watchpoint_max;
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/* Breakpoint unit status */
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uint32_t hw_breakpoint[CORTEXM_MAX_BREAKPOINTS];
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bool hw_breakpoint[CORTEXM_MAX_BREAKPOINTS];
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unsigned hw_breakpoint_max;
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/* Copy of DEMCR for vector-catch */
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uint32_t demcr;
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@ -240,6 +232,9 @@ bool cortexm_probe(ADIv5_AP_t *ap)
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t->halt_resume = cortexm_halt_resume;
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t->regs_size = sizeof(regnum_cortex_m);
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t->breakwatch_set = cortexm_breakwatch_set;
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t->breakwatch_clear = cortexm_breakwatch_clear;
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target_add_commands(t, cortexm_cmd_list, cortexm_driver_str);
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/* Probe for FP extension */
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@ -320,18 +315,12 @@ bool cortexm_attach(target *t)
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/* Clear any stale watchpoints */
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for(i = 0; i < priv->hw_watchpoint_max; i++) {
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target_mem_write32(t, CORTEXM_DWT_FUNC(i), 0);
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priv->hw_watchpoint[i].type = 0;
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priv->hw_watchpoint[i] = 0;
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}
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/* Flash Patch Control Register: set ENABLE */
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target_mem_write32(t, CORTEXM_FPB_CTRL,
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CORTEXM_FPB_CTRL_KEY | CORTEXM_FPB_CTRL_ENABLE);
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t->set_hw_bp = cortexm_set_hw_bp;
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t->clear_hw_bp = cortexm_clear_hw_bp;
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/* Data Watchpoint and Trace */
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t->set_hw_wp = cortexm_set_hw_wp;
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t->clear_hw_wp = cortexm_clear_hw_wp;
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platform_srst_set_val(false);
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@ -650,130 +639,110 @@ int cortexm_run_stub(target *t, uint32_t loadaddr,
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return bkpt_instr & 0xff;
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}
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/* The following routines implement hardware breakpoints.
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* The Flash Patch and Breakpoint (FPB) system is used. */
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/* The following routines implement hardware breakpoints and watchpoints.
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* The Flash Patch and Breakpoint (FPB) and Data Watch and Trace (DWT)
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* systems are used. */
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static int cortexm_set_hw_bp(target *t, target_addr addr, uint8_t len)
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static uint32_t dwt_mask(size_t len)
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{
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(void)len;
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struct cortexm_priv *priv = t->priv;
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uint32_t val = addr;
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unsigned i;
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switch (len) {
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case 1:
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return CORTEXM_DWT_MASK_BYTE;
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case 2:
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return CORTEXM_DWT_MASK_HALFWORD;
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case 4:
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return CORTEXM_DWT_MASK_WORD;
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default:
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return -1;
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}
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}
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static uint32_t dwt_func(target *t, enum target_breakwatch type)
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{
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uint32_t x = 0;
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if ((t->target_options & TOPT_FLAVOUR_V6M) == 0)
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x = CORTEXM_DWT_FUNC_DATAVSIZE_WORD;
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switch (type) {
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case TARGET_WATCH_WRITE:
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return CORTEXM_DWT_FUNC_FUNC_WRITE | x;
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case TARGET_WATCH_READ:
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return CORTEXM_DWT_FUNC_FUNC_READ | x;
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case TARGET_WATCH_ACCESS:
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return CORTEXM_DWT_FUNC_FUNC_ACCESS | x;
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default:
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return -1;
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}
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}
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static int cortexm_breakwatch_set(target *t, struct breakwatch *bw)
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{
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struct cortexm_priv *priv = t->priv;
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unsigned i;
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uint32_t val = bw->addr;
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switch (bw->type) {
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case TARGET_BREAK_HARD:
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if (priv->flash_patch_revision == 0) {
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val = addr & 0x1FFFFFFC;
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val |= (addr & 2)?0x80000000:0x40000000;
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val &= 0x1FFFFFFC;
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val |= (bw->addr & 2)?0x80000000:0x40000000;
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}
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val |= 1;
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for(i = 0; i < priv->hw_breakpoint_max; i++)
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if((priv->hw_breakpoint[i] & 1) == 0) break;
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if(i == priv->hw_breakpoint_max) return -1;
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priv->hw_breakpoint[i] = addr | 1;
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target_mem_write32(t, CORTEXM_FPB_COMP(i), val);
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return 0;
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}
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static int cortexm_clear_hw_bp(target *t, target_addr addr, uint8_t len)
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{
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(void)len;
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struct cortexm_priv *priv = t->priv;
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unsigned i;
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for(i = 0; i < priv->hw_breakpoint_max; i++)
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if((priv->hw_breakpoint[i] & ~1) == addr) break;
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if(i == priv->hw_breakpoint_max) return -1;
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priv->hw_breakpoint[i] = 0;
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target_mem_write32(t, CORTEXM_FPB_COMP(i), 0);
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return 0;
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}
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/* The following routines implement hardware watchpoints.
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* The Data Watch and Trace (DWT) system is used. */
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static int
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cortexm_set_hw_wp(target *t, uint8_t type, target_addr addr, uint8_t len)
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{
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struct cortexm_priv *priv = t->priv;
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unsigned i;
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switch(len) { /* Convert bytes size to mask size */
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case 1: len = CORTEXM_DWT_MASK_BYTE; break;
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case 2: len = CORTEXM_DWT_MASK_HALFWORD; break;
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case 4: len = CORTEXM_DWT_MASK_WORD; break;
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default:
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return -1;
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}
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switch(type) { /* Convert gdb type to function type */
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case 2: type = CORTEXM_DWT_FUNC_FUNC_WRITE; break;
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case 3: type = CORTEXM_DWT_FUNC_FUNC_READ; break;
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case 4: type = CORTEXM_DWT_FUNC_FUNC_ACCESS; break;
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default:
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return -1;
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}
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for(i = 0; i < priv->hw_watchpoint_max; i++)
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if((priv->hw_watchpoint[i].type == 0) &&
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((target_mem_read32(t, CORTEXM_DWT_FUNC(i)) & 0xF) == 0))
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if (!priv->hw_breakpoint[i])
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break;
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if(i == priv->hw_watchpoint_max) return -2;
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priv->hw_watchpoint[i].type = type;
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priv->hw_watchpoint[i].addr = addr;
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priv->hw_watchpoint[i].size = len;
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target_mem_write32(t, CORTEXM_DWT_COMP(i), addr);
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target_mem_write32(t, CORTEXM_DWT_MASK(i), len);
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target_mem_write32(t, CORTEXM_DWT_FUNC(i), type |
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((t->target_options & TOPT_FLAVOUR_V6M) ? 0: CORTEXM_DWT_FUNC_DATAVSIZE_WORD));
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if (i == priv->hw_breakpoint_max)
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return -1;
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priv->hw_breakpoint[i] = true;
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target_mem_write32(t, CORTEXM_FPB_COMP(i), val);
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bw->reserved[0] = i;
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return 0;
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case TARGET_WATCH_WRITE:
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case TARGET_WATCH_READ:
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case TARGET_WATCH_ACCESS:
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for(i = 0; i < priv->hw_watchpoint_max; i++)
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if (!priv->hw_watchpoint[i])
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break;
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if (i == priv->hw_watchpoint_max)
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return -1;
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priv->hw_watchpoint[i] = true;
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target_mem_write32(t, CORTEXM_DWT_COMP(i), val);
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target_mem_write32(t, CORTEXM_DWT_MASK(i), dwt_mask(bw->size));
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target_mem_write32(t, CORTEXM_DWT_FUNC(i), dwt_func(t, bw->type));
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bw->reserved[0] = i;
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return 0;
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default:
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return 1;
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}
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}
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static int
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cortexm_clear_hw_wp(target *t, uint8_t type, target_addr addr, uint8_t len)
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static int cortexm_breakwatch_clear(target *t, struct breakwatch *bw)
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{
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struct cortexm_priv *priv = t->priv;
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unsigned i;
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switch(len) {
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case 1: len = CORTEXM_DWT_MASK_BYTE; break;
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case 2: len = CORTEXM_DWT_MASK_HALFWORD; break;
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case 4: len = CORTEXM_DWT_MASK_WORD; break;
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default:
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return -1;
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}
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switch(type) {
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case 2: type = CORTEXM_DWT_FUNC_FUNC_WRITE; break;
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case 3: type = CORTEXM_DWT_FUNC_FUNC_READ; break;
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case 4: type = CORTEXM_DWT_FUNC_FUNC_ACCESS; break;
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default:
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return -1;
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}
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for(i = 0; i < priv->hw_watchpoint_max; i++)
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if((priv->hw_watchpoint[i].addr == addr) &&
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(priv->hw_watchpoint[i].type == type) &&
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(priv->hw_watchpoint[i].size == len)) break;
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if(i == priv->hw_watchpoint_max) return -2;
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priv->hw_watchpoint[i].type = 0;
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target_mem_write32(t, CORTEXM_DWT_FUNC(i), 0);
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unsigned i = bw->reserved[0];
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switch (bw->type) {
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case TARGET_BREAK_HARD:
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priv->hw_breakpoint[i] = false;
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target_mem_write32(t, CORTEXM_FPB_COMP(i), 0);
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return 0;
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case TARGET_WATCH_WRITE:
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case TARGET_WATCH_READ:
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case TARGET_WATCH_ACCESS:
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priv->hw_watchpoint[i] = false;
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target_mem_write32(t, CORTEXM_DWT_FUNC(i), 0);
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return 0;
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default:
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return 1;
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}
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}
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static target_addr cortexm_check_watch(target *t)
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@ -783,14 +752,15 @@ static target_addr cortexm_check_watch(target *t)
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for(i = 0; i < priv->hw_watchpoint_max; i++)
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/* if SET and MATCHED then break */
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if(priv->hw_watchpoint[i].type &&
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if(priv->hw_watchpoint[i] &&
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(target_mem_read32(t, CORTEXM_DWT_FUNC(i)) &
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CORTEXM_DWT_FUNC_MATCHED))
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break;
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if(i == priv->hw_watchpoint_max) return 0;
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if (i == priv->hw_watchpoint_max)
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return 0;
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return priv->hw_watchpoint[i].addr;
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return target_mem_read32(t, CORTEXM_DWT_COMP(i));
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}
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static bool cortexm_vector_catch(target *t, int argc, char *argv[])
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@ -73,6 +73,11 @@ void target_list_free(void)
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free(target_list->flash);
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target_list->flash = next;
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}
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while (target_list->bw_list) {
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void * next = target_list->bw_list->next;
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free(target_list->bw_list);
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target_list->bw_list = next;
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}
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free(target_list);
|
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target_list = t;
|
||||
}
|
||||
|
|
@ -316,37 +321,53 @@ void target_halt_resume(target *t, bool step) { t->halt_resume(t, step); }
|
|||
int target_breakwatch_set(target *t,
|
||||
enum target_breakwatch type, target_addr addr, size_t len)
|
||||
{
|
||||
switch (type) {
|
||||
case TARGET_BREAK_HARD:
|
||||
if (t->set_hw_bp)
|
||||
return t->set_hw_bp(t, addr, len);
|
||||
case TARGET_WATCH_WRITE:
|
||||
case TARGET_WATCH_READ:
|
||||
case TARGET_WATCH_ACCESS:
|
||||
if (t->set_hw_wp)
|
||||
return t->set_hw_wp(t, type, addr, len);
|
||||
default:
|
||||
break;
|
||||
struct breakwatch bw = {
|
||||
.type = type,
|
||||
.addr = addr,
|
||||
.size = len,
|
||||
};
|
||||
int ret = 1;
|
||||
|
||||
if (t->breakwatch_set)
|
||||
ret = t->breakwatch_set(t, &bw);
|
||||
|
||||
if (ret == 0) {
|
||||
/* Success, make a heap copy and add to list */
|
||||
struct breakwatch *bwm = malloc(sizeof bw);
|
||||
memcpy(bwm, &bw, sizeof(bw));
|
||||
bwm->next = t->bw_list;
|
||||
t->bw_list = bwm;
|
||||
}
|
||||
return 1;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int target_breakwatch_clear(target *t,
|
||||
enum target_breakwatch type, target_addr addr, size_t len)
|
||||
{
|
||||
switch (type) {
|
||||
case TARGET_BREAK_HARD:
|
||||
if (t->set_hw_bp)
|
||||
return t->set_hw_bp(t, addr, len);
|
||||
case TARGET_WATCH_WRITE:
|
||||
case TARGET_WATCH_READ:
|
||||
case TARGET_WATCH_ACCESS:
|
||||
if (t->set_hw_wp)
|
||||
return t->set_hw_wp(t, type, addr, len);
|
||||
default:
|
||||
struct breakwatch *bwp = NULL, *bw;
|
||||
int ret = 1;
|
||||
for (bw = t->bw_list; bw; bw = bw->next, bwp = bw)
|
||||
if ((bw->type == type) &&
|
||||
(bw->addr == addr) &&
|
||||
(bw->size == len))
|
||||
break;
|
||||
|
||||
if (bw == NULL)
|
||||
return -1;
|
||||
|
||||
if (t->breakwatch_clear)
|
||||
ret = t->breakwatch_clear(t, bw);
|
||||
|
||||
if (ret == 0) {
|
||||
if (bwp == NULL) {
|
||||
t->bw_list = bw->next;
|
||||
} else {
|
||||
bwp->next = bw->next;
|
||||
}
|
||||
return 1;
|
||||
free(bw);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Accessor functions */
|
||||
|
|
|
|||
|
|
@ -68,6 +68,14 @@ struct target_command_s {
|
|||
struct target_command_s *next;
|
||||
};
|
||||
|
||||
struct breakwatch {
|
||||
struct breakwatch *next;
|
||||
enum target_breakwatch type;
|
||||
target_addr addr;
|
||||
size_t size;
|
||||
uint32_t reserved[4]; /* for use by the implementing driver */
|
||||
};
|
||||
|
||||
struct target_s {
|
||||
bool attached;
|
||||
struct target_controller *tc;
|
||||
|
|
@ -96,11 +104,9 @@ struct target_s {
|
|||
void (*halt_resume)(target *t, bool step);
|
||||
|
||||
/* Break-/watchpoint functions */
|
||||
int (*set_hw_bp)(target *t, target_addr addr, uint8_t len);
|
||||
int (*clear_hw_bp)(target *t, target_addr addr, uint8_t len);
|
||||
|
||||
int (*set_hw_wp)(target *t, uint8_t type, target_addr addr, uint8_t len);
|
||||
int (*clear_hw_wp)(target *t, uint8_t type, target_addr addr, uint8_t len);
|
||||
int (*breakwatch_set)(target *t, struct breakwatch*);
|
||||
int (*breakwatch_clear)(target *t, struct breakwatch*);
|
||||
struct breakwatch *bw_list;
|
||||
|
||||
/* target-defined options */
|
||||
unsigned target_options;
|
||||
|
|
|
|||
Loading…
Reference in New Issue