gdb_server, rtos: Fine-grained RTOS register access
1. Add get_thread_reg() to rtos. It's used in rtos_get_gdb_reg() to read the value of a single register, instead of reading all register values by calling get_thread_reg_list(). 2. Add set_reg() to rtos. gdb_server uses this to change a single register value for a specific thread. 3. Add target_get_gdb_reg_list_noread() so it's possible for gdb to get a list of registers without attempting to read their contents. The clang static checker doesn't find any new problems with this change. Change-Id: I77f792d1238cb015b91527ca8cb99593ccc8870e Signed-off-by: Tim Newsome <tim@sifive.com> Reviewed-on: http://openocd.zylin.com/5114 Tested-by: jenkins Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>bscan_optimization
Tim Newsome
Andreas Fritiofson
parent
16496488d1
commit
0819541366
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@ -462,6 +462,7 @@ static int rtos_put_gdb_reg_list(struct connection *connection,
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return ERROR_OK;
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}
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/** Look through all registers to find this register. */
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int rtos_get_gdb_reg(struct connection *connection, int reg_num)
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{
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struct target *target = get_target_from_connection(connection);
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@ -473,19 +474,31 @@ int rtos_get_gdb_reg(struct connection *connection, int reg_num)
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struct rtos_reg *reg_list;
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int num_regs;
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LOG_DEBUG("RTOS: getting register %d for thread 0x%" PRIx64
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", target->rtos->current_thread=0x%" PRIx64 "\r\n",
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LOG_DEBUG("getting register %d for thread 0x%" PRIx64
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", target->rtos->current_thread=0x%" PRIx64,
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reg_num,
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current_threadid,
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target->rtos->current_thread);
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int retval = target->rtos->type->get_thread_reg_list(target->rtos,
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current_threadid,
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®_list,
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&num_regs);
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if (retval != ERROR_OK) {
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LOG_ERROR("RTOS: failed to get register list");
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return retval;
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int retval;
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if (target->rtos->type->get_thread_reg) {
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reg_list = calloc(1, sizeof(*reg_list));
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num_regs = 1;
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retval = target->rtos->type->get_thread_reg(target->rtos,
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current_threadid, reg_num, ®_list[0]);
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if (retval != ERROR_OK) {
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LOG_ERROR("RTOS: failed to get register %d", reg_num);
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return retval;
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}
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} else {
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retval = target->rtos->type->get_thread_reg_list(target->rtos,
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current_threadid,
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®_list,
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&num_regs);
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if (retval != ERROR_OK) {
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LOG_ERROR("RTOS: failed to get register list");
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return retval;
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}
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}
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for (int i = 0; i < num_regs; ++i) {
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@ -501,6 +514,7 @@ int rtos_get_gdb_reg(struct connection *connection, int reg_num)
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return ERROR_FAIL;
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}
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/** Return a list of general registers. */
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int rtos_get_gdb_reg_list(struct connection *connection)
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{
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struct target *target = get_target_from_connection(connection);
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@ -534,6 +548,20 @@ int rtos_get_gdb_reg_list(struct connection *connection)
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return ERROR_FAIL;
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}
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int rtos_set_reg(struct connection *connection, int reg_num,
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uint8_t *reg_value)
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{
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struct target *target = get_target_from_connection(connection);
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int64_t current_threadid = target->rtos->current_threadid;
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if ((target->rtos != NULL) &&
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(target->rtos->type->set_reg != NULL) &&
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(current_threadid != -1) &&
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(current_threadid != 0)) {
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return target->rtos->type->set_reg(target->rtos, reg_num, reg_value);
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}
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return ERROR_FAIL;
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}
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int rtos_generic_stack_read(struct target *target,
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const struct rtos_register_stacking *stacking,
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int64_t stack_ptr,
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@ -20,6 +20,7 @@
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#define OPENOCD_RTOS_RTOS_H
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#include "server/server.h"
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#include "target/target.h"
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#include <jim-nvp.h>
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typedef int64_t threadid_t;
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@ -49,7 +50,9 @@ struct rtos {
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symbol_table_elem_t *symbols;
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struct target *target;
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/* add a context variable instead of global variable */
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/* The thread currently selected by gdb. */
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int64_t current_threadid;
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/* The currently selected thread according to the target. */
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threadid_t current_thread;
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struct thread_detail *thread_details;
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int thread_count;
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@ -70,11 +73,15 @@ struct rtos_type {
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int (*create)(struct target *target);
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int (*smp_init)(struct target *target);
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int (*update_threads)(struct rtos *rtos);
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/** Return a list of general registers, with their values filled out. */
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int (*get_thread_reg_list)(struct rtos *rtos, int64_t thread_id,
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struct rtos_reg **reg_list, int *num_regs);
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int (*get_thread_reg)(struct rtos *rtos, int64_t thread_id,
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uint32_t reg_num, struct rtos_reg *reg);
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int (*get_symbol_list_to_lookup)(symbol_table_elem_t *symbol_list[]);
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int (*clean)(struct target *target);
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char * (*ps_command)(struct target *target);
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int (*set_reg)(struct rtos *rtos, uint32_t reg_num, uint8_t *reg_value);
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};
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struct stack_register_offset {
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@ -104,6 +111,8 @@ struct rtos_register_stacking {
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#define GDB_THREAD_PACKET_NOT_CONSUMED (-40)
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int rtos_create(Jim_GetOptInfo *goi, struct target *target);
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int rtos_set_reg(struct connection *connection, int reg_num,
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uint8_t *reg_value);
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int rtos_generic_stack_read(struct target *target,
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const struct rtos_register_stacking *stacking,
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int64_t stack_ptr,
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@ -724,7 +724,7 @@ static int gdb_output(struct command_context *context, const char *line)
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static void gdb_signal_reply(struct target *target, struct connection *connection)
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{
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struct gdb_connection *gdb_connection = connection->priv;
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char sig_reply[45];
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char sig_reply[65];
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char stop_reason[20];
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char current_thread[25];
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int sig_reply_len;
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@ -735,17 +735,25 @@ static void gdb_signal_reply(struct target *target, struct connection *connectio
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if (target->debug_reason == DBG_REASON_EXIT) {
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sig_reply_len = snprintf(sig_reply, sizeof(sig_reply), "W00");
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} else {
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struct target *ct;
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if (target->rtos != NULL) {
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target->rtos->current_threadid = target->rtos->current_thread;
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target->rtos->gdb_target_for_threadid(connection, target->rtos->current_threadid, &ct);
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} else {
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ct = target;
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}
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if (gdb_connection->ctrl_c) {
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signal_var = 0x2;
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} else
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signal_var = gdb_last_signal(target);
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signal_var = gdb_last_signal(ct);
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stop_reason[0] = '\0';
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if (target->debug_reason == DBG_REASON_WATCHPOINT) {
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if (ct->debug_reason == DBG_REASON_WATCHPOINT) {
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enum watchpoint_rw hit_wp_type;
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target_addr_t hit_wp_address;
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if (watchpoint_hit(target, &hit_wp_type, &hit_wp_address) == ERROR_OK) {
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if (watchpoint_hit(ct, &hit_wp_type, &hit_wp_address) == ERROR_OK) {
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switch (hit_wp_type) {
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case WPT_WRITE:
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@ -767,15 +775,9 @@ static void gdb_signal_reply(struct target *target, struct connection *connectio
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}
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current_thread[0] = '\0';
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if (target->rtos != NULL) {
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struct target *ct;
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snprintf(current_thread, sizeof(current_thread), "thread:%016" PRIx64 ";",
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if (target->rtos != NULL)
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snprintf(current_thread, sizeof(current_thread), "thread:%" PRIx64 ";",
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target->rtos->current_thread);
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target->rtos->current_threadid = target->rtos->current_thread;
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target->rtos->gdb_target_for_threadid(connection, target->rtos->current_threadid, &ct);
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if (!gdb_connection->ctrl_c)
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signal_var = gdb_last_signal(ct);
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}
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sig_reply_len = snprintf(sig_reply, sizeof(sig_reply), "T%2.2x%s%s",
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signal_var, stop_reason, current_thread);
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@ -1300,7 +1302,7 @@ static int gdb_get_register_packet(struct connection *connection,
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if ((target->rtos != NULL) && (ERROR_OK == rtos_get_gdb_reg(connection, reg_num)))
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return ERROR_OK;
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retval = target_get_gdb_reg_list(target, ®_list, ®_list_size,
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retval = target_get_gdb_reg_list_noread(target, ®_list, ®_list_size,
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REG_CLASS_ALL);
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if (retval != ERROR_OK)
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return gdb_error(connection, retval);
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@ -1336,37 +1338,49 @@ static int gdb_set_register_packet(struct connection *connection,
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{
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struct target *target = get_target_from_connection(connection);
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char *separator;
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uint8_t *bin_buf;
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int reg_num = strtoul(packet + 1, &separator, 16);
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struct reg **reg_list;
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int reg_list_size;
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int retval;
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#ifdef _DEBUG_GDB_IO_
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LOG_DEBUG("-");
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retval = target_get_gdb_reg_list(target, ®_list, ®_list_size,
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REG_CLASS_ALL);
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if (retval != ERROR_OK)
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return gdb_error(connection, retval);
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if (reg_list_size <= reg_num) {
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LOG_ERROR("gdb requested a non-existing register");
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return ERROR_SERVER_REMOTE_CLOSED;
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}
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#endif
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if (*separator != '=') {
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LOG_ERROR("GDB 'set register packet', but no '=' following the register number");
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return ERROR_SERVER_REMOTE_CLOSED;
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}
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size_t chars = strlen(separator + 1);
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uint8_t *bin_buf = malloc(chars / 2);
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gdb_target_to_reg(target, separator + 1, chars, bin_buf);
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/* convert from GDB-string (target-endian) to hex-string (big-endian) */
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bin_buf = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8));
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int chars = (DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);
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if ((unsigned int)chars != strlen(separator + 1)) {
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LOG_ERROR("gdb sent %zu bits for a %d-bit register (%s)",
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strlen(separator + 1) * 4, chars * 4, reg_list[reg_num]->name);
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if ((target->rtos != NULL) &&
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(ERROR_OK == rtos_set_reg(connection, reg_num, bin_buf))) {
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free(bin_buf);
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gdb_put_packet(connection, "OK", 2);
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return ERROR_OK;
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}
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retval = target_get_gdb_reg_list_noread(target, ®_list, ®_list_size,
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REG_CLASS_ALL);
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if (retval != ERROR_OK) {
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free(bin_buf);
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return gdb_error(connection, retval);
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}
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if (reg_list_size <= reg_num) {
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LOG_ERROR("gdb requested a non-existing register");
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free(bin_buf);
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free(reg_list);
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return ERROR_SERVER_REMOTE_CLOSED;
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}
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if (chars != (DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2)) {
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LOG_ERROR("gdb sent %d bits for a %d-bit register (%s)",
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(int) chars * 4, reg_list[reg_num]->size, reg_list[reg_num]->name);
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free(bin_buf);
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free(reg_list);
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return ERROR_SERVER_REMOTE_CLOSED;
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}
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@ -1634,7 +1648,7 @@ static int gdb_breakpoint_watchpoint_packet(struct connection *connection,
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char *separator;
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int retval;
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LOG_DEBUG("-");
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LOG_DEBUG("[%s]", target_name(target));
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type = strtoul(packet + 1, &separator, 16);
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@ -2200,7 +2214,7 @@ static int gdb_generate_target_description(struct target *target, char **tdesc_o
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arch_defined_types = calloc(1, sizeof(char *));
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retval = target_get_gdb_reg_list(target, ®_list,
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retval = target_get_gdb_reg_list_noread(target, ®_list,
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®_list_size, REG_CLASS_ALL);
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if (retval != ERROR_OK) {
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@ -2388,7 +2402,7 @@ static int gdb_target_description_supported(struct target *target, int *supporte
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char const *architecture = target_get_gdb_arch(target);
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retval = target_get_gdb_reg_list(target, ®_list,
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retval = target_get_gdb_reg_list_noread(target, ®_list,
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®_list_size, REG_CLASS_ALL);
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if (retval != ERROR_OK) {
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LOG_ERROR("get register list failed");
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@ -2783,13 +2797,11 @@ static bool gdb_handle_vcont_packet(struct connection *connection, const char *p
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if (parse[0] == 'c') {
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parse += 1;
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packet_size -= 1;
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/* check if thread-id follows */
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if (parse[0] == ':') {
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int64_t tid;
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parse += 1;
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packet_size -= 1;
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tid = strtoll(parse, &endp, 16);
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if (tid == thread_id) {
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@ -2879,10 +2891,9 @@ static int gdb_v_packet(struct connection *connection,
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char const *packet, int packet_size)
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{
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struct gdb_connection *gdb_connection = connection->priv;
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struct target *target;
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int result;
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target = get_target_from_connection(connection);
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struct target *target = get_target_from_connection(connection);
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if (strncmp(packet, "vCont", 5) == 0) {
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bool handled;
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@ -36,6 +36,29 @@
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* may be separate registers associated with debug or trace modules.
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*/
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struct reg *register_get_by_number(struct reg_cache *first,
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uint32_t reg_num, bool search_all)
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{
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unsigned i;
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struct reg_cache *cache = first;
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while (cache) {
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for (i = 0; i < cache->num_regs; i++) {
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if (cache->reg_list[i].exist == false)
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continue;
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if (cache->reg_list[i].number == reg_num)
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return &(cache->reg_list[i]);
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}
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if (search_all)
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cache = cache->next;
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else
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break;
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}
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return NULL;
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}
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struct reg *register_get_by_name(struct reg_cache *first,
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const char *name, bool search_all)
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{
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@ -159,6 +159,8 @@ struct reg_arch_type {
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int (*set)(struct reg *reg, uint8_t *buf);
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};
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struct reg *register_get_by_number(struct reg_cache *first,
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uint32_t reg_num, bool search_all);
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struct reg *register_get_by_name(struct reg_cache *first,
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const char *name, bool search_all);
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struct reg_cache **register_get_last_cache_p(struct reg_cache **first);
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@ -1215,7 +1215,24 @@ int target_get_gdb_reg_list(struct target *target,
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struct reg **reg_list[], int *reg_list_size,
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enum target_register_class reg_class)
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{
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return target->type->get_gdb_reg_list(target, reg_list, reg_list_size, reg_class);
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int result = target->type->get_gdb_reg_list(target, reg_list,
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reg_list_size, reg_class);
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if (result != ERROR_OK) {
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*reg_list = NULL;
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*reg_list_size = 0;
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}
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return result;
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}
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int target_get_gdb_reg_list_noread(struct target *target,
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struct reg **reg_list[], int *reg_list_size,
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enum target_register_class reg_class)
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{
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if (target->type->get_gdb_reg_list_noread &&
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target->type->get_gdb_reg_list_noread(target, reg_list,
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reg_list_size, reg_class) == ERROR_OK)
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return ERROR_OK;
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return target_get_gdb_reg_list(target, reg_list, reg_list_size, reg_class);
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}
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bool target_supports_gdb_connection(struct target *target)
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@ -1587,8 +1604,9 @@ int target_call_event_callbacks(struct target *target, enum target_event event)
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target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
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}
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LOG_DEBUG("target event %i (%s)", event,
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Jim_Nvp_value2name_simple(nvp_target_event, event)->name);
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LOG_DEBUG("target event %i (%s) for core %s", event,
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Jim_Nvp_value2name_simple(nvp_target_event, event)->name,
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target_name(target));
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target_handle_event(target, event);
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@ -502,6 +502,16 @@ int target_get_gdb_reg_list(struct target *target,
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struct reg **reg_list[], int *reg_list_size,
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enum target_register_class reg_class);
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/**
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* Obtain the registers for GDB, but don't read register values from the
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* target.
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*
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* This routine is a wrapper for target->type->get_gdb_reg_list_noread.
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*/
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int target_get_gdb_reg_list_noread(struct target *target,
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struct reg **reg_list[], int *reg_list_size,
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enum target_register_class reg_class);
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/**
|
||||
* Check if @a target allows GDB connections.
|
||||
*
|
||||
|
|
|
|||
|
|
@ -111,6 +111,13 @@ struct target_type {
|
|||
int (*get_gdb_reg_list)(struct target *target, struct reg **reg_list[],
|
||||
int *reg_list_size, enum target_register_class reg_class);
|
||||
|
||||
/**
|
||||
* Same as get_gdb_reg_list, but doesn't read the register values.
|
||||
* */
|
||||
int (*get_gdb_reg_list_noread)(struct target *target,
|
||||
struct reg **reg_list[], int *reg_list_size,
|
||||
enum target_register_class reg_class);
|
||||
|
||||
/* target memory access
|
||||
* size: 1 = byte (8bit), 2 = half-word (16bit), 4 = word (32bit)
|
||||
* count: number of items of <size>
|
||||
|
|
|
|||
Loading…
Reference in New Issue