mem_ap: allow GDB connections

[fw/openocd] / src / target / mem_ap.c

diff --git a/src/target/mem_ap.c b/src/target/mem_ap.c
index 7ed41c63c37bcb1cc8270c0050e009a1e3f3b3e4..89c0c02c032f0d297d1ae35f56f1a0716132adf2 100644 (file)
--- a/src/target/mem_ap.c
+++ b/src/target/mem_ap.c
@@ -20,6 +20,7 @@
 #include "target_type.h"
 #include "arm.h"
 #include "arm_adi_v5.h"
+#include "register.h"
 
 #include <jtag/jtag.h>
 
@@ -55,6 +56,9 @@ static int mem_ap_target_create(struct target *target, Jim_Interp *interp)
 
        target->arch_info = mem_ap;
 
+       if (!target->gdb_port_override)
+               target->gdb_port_override = strdup("disabled");
+
        return ERROR_OK;
 }
 
@@ -62,6 +66,7 @@ static int mem_ap_init_target(struct command_context *cmd_ctx, struct target *ta
 {
        LOG_DEBUG("%s", __func__);
        target->state = TARGET_UNKNOWN;
+       target->debug_reason = DBG_REASON_UNDEFINED;
        return ERROR_OK;
 }
 
@@ -82,8 +87,10 @@ static int mem_ap_arch_state(struct target *target)
 
 static int mem_ap_poll(struct target *target)
 {
-       if (target->state == TARGET_UNKNOWN)
+       if (target->state == TARGET_UNKNOWN) {
                target->state = TARGET_RUNNING;
+               target->debug_reason = DBG_REASON_NOTHALTED;
+       }
 
        return ERROR_OK;
 }
@@ -92,6 +99,8 @@ static int mem_ap_halt(struct target *target)
 {
        LOG_DEBUG("%s", __func__);
        target->state = TARGET_HALTED;
+       target->debug_reason = DBG_REASON_DBGRQ;
+       target_call_event_callbacks(target, TARGET_EVENT_HALTED);
        return ERROR_OK;
 }
 
@@ -100,6 +109,7 @@ static int mem_ap_resume(struct target *target, int current, target_addr_t addre
 {
        LOG_DEBUG("%s", __func__);
        target->state = TARGET_RUNNING;
+       target->debug_reason = DBG_REASON_NOTHALTED;
        return ERROR_OK;
 }
 
@@ -108,12 +118,15 @@ static int mem_ap_step(struct target *target, int current, target_addr_t address
 {
        LOG_DEBUG("%s", __func__);
        target->state = TARGET_HALTED;
+       target->debug_reason = DBG_REASON_DBGRQ;
+       target_call_event_callbacks(target, TARGET_EVENT_HALTED);
        return ERROR_OK;
 }
 
 static int mem_ap_assert_reset(struct target *target)
 {
        target->state = TARGET_RESET;
+       target->debug_reason = DBG_REASON_UNDEFINED;
 
        LOG_DEBUG("%s", __func__);
        return ERROR_OK;
@@ -127,6 +140,7 @@ static int mem_ap_examine(struct target *target)
                mem_ap->ap = dap_ap(mem_ap->arm.dap, mem_ap->ap_num);
                target_set_examined(target);
                target->state = TARGET_UNKNOWN;
+               target->debug_reason = DBG_REASON_UNDEFINED;
                return mem_ap_init(mem_ap->ap);
        }
 
@@ -135,15 +149,85 @@ static int mem_ap_examine(struct target *target)
 
 static int mem_ap_deassert_reset(struct target *target)
 {
-       if (target->reset_halt)
+       if (target->reset_halt) {
                target->state = TARGET_HALTED;
-       else
+               target->debug_reason = DBG_REASON_DBGRQ;
+               target_call_event_callbacks(target, TARGET_EVENT_HALTED);
+       } else {
                target->state = TARGET_RUNNING;
+               target->debug_reason = DBG_REASON_NOTHALTED;
+       }
 
        LOG_DEBUG("%s", __func__);
        return ERROR_OK;
 }
 
+static int mem_ap_reg_get(struct reg *reg)
+{
+       return ERROR_OK;
+}
+
+static int mem_ap_reg_set(struct reg *reg, uint8_t *buf)
+{
+       return ERROR_OK;
+}
+
+static struct reg_arch_type mem_ap_reg_arch_type = {
+       .get = mem_ap_reg_get,
+       .set = mem_ap_reg_set,
+};
+
+const char *mem_ap_get_gdb_arch(struct target *target)
+{
+       return "arm";
+}
+
+/*
+ * Dummy ARM register emulation:
+ * reg[0..15]:  32 bits, r0~r12, sp, lr, pc
+ * reg[16..23]: 96 bits, f0~f7
+ * reg[24]:     32 bits, fps
+ * reg[25]:     32 bits, cpsr
+ *
+ * Set 'exist' only to reg[0..15], so initial response to GDB is correct
+ */
+#define NUM_REGS     26
+#define MAX_REG_SIZE 96
+#define REG_EXIST(n) ((n) < 16)
+#define REG_SIZE(n)  ((((n) >= 16) && ((n) < 24)) ? 96 : 32)
+
+struct mem_ap_alloc_reg_list {
+       /* reg_list must be the first field */
+       struct reg *reg_list[NUM_REGS];
+       struct reg regs[NUM_REGS];
+       uint8_t regs_value[MAX_REG_SIZE / 8];
+};
+
+static int mem_ap_get_gdb_reg_list(struct target *target, struct reg **reg_list[],
+                               int *reg_list_size, enum target_register_class reg_class)
+{
+       struct mem_ap_alloc_reg_list *mem_ap_alloc = calloc(1, sizeof(struct mem_ap_alloc_reg_list));
+       if (!mem_ap_alloc) {
+               LOG_ERROR("Out of memory");
+               return ERROR_FAIL;
+       }
+
+       *reg_list = mem_ap_alloc->reg_list;
+       *reg_list_size = NUM_REGS;
+       struct reg *regs = mem_ap_alloc->regs;
+
+       for (int i = 0; i < NUM_REGS; i++) {
+               regs[i].number = i;
+               regs[i].value = mem_ap_alloc->regs_value;
+               regs[i].size = REG_SIZE(i);
+               regs[i].exist = REG_EXIST(i);
+               regs[i].type = &mem_ap_reg_arch_type;
+               (*reg_list)[i] = &regs[i];
+       }
+
+       return ERROR_OK;
+}
+
 static int mem_ap_read_memory(struct target *target, target_addr_t address,
                               uint32_t size, uint32_t count, uint8_t *buffer)
 {
@@ -192,6 +276,9 @@ struct target_type mem_ap_target = {
        .assert_reset = mem_ap_assert_reset,
        .deassert_reset = mem_ap_deassert_reset,
 
+       .get_gdb_arch = mem_ap_get_gdb_arch,
+       .get_gdb_reg_list = mem_ap_get_gdb_reg_list,
+
        .read_memory = mem_ap_read_memory,
        .write_memory = mem_ap_write_memory,
 };