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gdb_server, rtos: Fine-grained RTOS register access

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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>
This commit is contained in:
Tim Newsome 2019-04-08 16:42:48 -07:00 committed by Andreas Fritiofson
parent 16496488d1
commit 0819541366
8 changed files with 158 additions and 50 deletions
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46
src/rtos/rtos.c
View File

@ -462,6 +462,7 @@ static int rtos_put_gdb_reg_list(struct connection *connection,
return ERROR_OK;
}
/** Look through all registers to find this register. */
int rtos_get_gdb_reg(struct connection *connection, int reg_num)
{
struct target *target = get_target_from_connection(connection);
@ -473,19 +474,31 @@ int rtos_get_gdb_reg(struct connection *connection, int reg_num)
struct rtos_reg *reg_list;
int num_regs;
LOG_DEBUG("RTOS: getting register %d for thread 0x%" PRIx64
", target->rtos->current_thread=0x%" PRIx64 "\r\n",
LOG_DEBUG("getting register %d for thread 0x%" PRIx64
", target->rtos->current_thread=0x%" PRIx64,
reg_num,
current_threadid,
target->rtos->current_thread);
int retval = target->rtos->type->get_thread_reg_list(target->rtos,
current_threadid,
&reg_list,
&num_regs);
if (retval != ERROR_OK) {
LOG_ERROR("RTOS: failed to get register list");
return retval;
int retval;
if (target->rtos->type->get_thread_reg) {
reg_list = calloc(1, sizeof(*reg_list));
num_regs = 1;
retval = target->rtos->type->get_thread_reg(target->rtos,
current_threadid, reg_num, &reg_list[0]);
if (retval != ERROR_OK) {
LOG_ERROR("RTOS: failed to get register %d", reg_num);
return retval;
}
} else {
retval = target->rtos->type->get_thread_reg_list(target->rtos,
current_threadid,
&reg_list,
&num_regs);
if (retval != ERROR_OK) {
LOG_ERROR("RTOS: failed to get register list");
return retval;
}
}
for (int i = 0; i < num_regs; ++i) {
@ -501,6 +514,7 @@ int rtos_get_gdb_reg(struct connection *connection, int reg_num)
return ERROR_FAIL;
}
/** Return a list of general registers. */
int rtos_get_gdb_reg_list(struct connection *connection)
{
struct target *target = get_target_from_connection(connection);
@ -534,6 +548,20 @@ int rtos_get_gdb_reg_list(struct connection *connection)
return ERROR_FAIL;
}
int rtos_set_reg(struct connection *connection, int reg_num,
uint8_t *reg_value)
{
struct target *target = get_target_from_connection(connection);
int64_t current_threadid = target->rtos->current_threadid;
if ((target->rtos != NULL) &&
(target->rtos->type->set_reg != NULL) &&
(current_threadid != -1) &&
(current_threadid != 0)) {
return target->rtos->type->set_reg(target->rtos, reg_num, reg_value);
}
return ERROR_FAIL;
}
int rtos_generic_stack_read(struct target *target,
const struct rtos_register_stacking *stacking,
int64_t stack_ptr,

9
src/rtos/rtos.h
View File

@ -20,6 +20,7 @@
#define OPENOCD_RTOS_RTOS_H
#include "server/server.h"
#include "target/target.h"
#include <jim-nvp.h>
typedef int64_t threadid_t;
@ -49,7 +50,9 @@ struct rtos {
symbol_table_elem_t *symbols;
struct target *target;
/* add a context variable instead of global variable */
/* The thread currently selected by gdb. */
int64_t current_threadid;
/* The currently selected thread according to the target. */
threadid_t current_thread;
struct thread_detail *thread_details;
int thread_count;
@ -70,11 +73,15 @@ struct rtos_type {
int (*create)(struct target *target);
int (*smp_init)(struct target *target);
int (*update_threads)(struct rtos *rtos);
/** Return a list of general registers, with their values filled out. */
int (*get_thread_reg_list)(struct rtos *rtos, int64_t thread_id,
struct rtos_reg **reg_list, int *num_regs);
int (*get_thread_reg)(struct rtos *rtos, int64_t thread_id,
uint32_t reg_num, struct rtos_reg *reg);
int (*get_symbol_list_to_lookup)(symbol_table_elem_t *symbol_list[]);
int (*clean)(struct target *target);
char * (*ps_command)(struct target *target);
int (*set_reg)(struct rtos *rtos, uint32_t reg_num, uint8_t *reg_value);
};
struct stack_register_offset {
@ -104,6 +111,8 @@ struct rtos_register_stacking {
#define GDB_THREAD_PACKET_NOT_CONSUMED (-40)
int rtos_create(Jim_GetOptInfo *goi, struct target *target);
int rtos_set_reg(struct connection *connection, int reg_num,
uint8_t *reg_value);
int rtos_generic_stack_read(struct target *target,
const struct rtos_register_stacking *stacking,
int64_t stack_ptr,

87
src/server/gdb_server.c
View File

@ -724,7 +724,7 @@ static int gdb_output(struct command_context *context, const char *line)
static void gdb_signal_reply(struct target *target, struct connection *connection)
{
struct gdb_connection *gdb_connection = connection->priv;
char sig_reply[45];
char sig_reply[65];
char stop_reason[20];
char current_thread[25];
int sig_reply_len;
@ -735,17 +735,25 @@ static void gdb_signal_reply(struct target *target, struct connection *connectio
if (target->debug_reason == DBG_REASON_EXIT) {
sig_reply_len = snprintf(sig_reply, sizeof(sig_reply), "W00");
} else {
struct target *ct;
if (target->rtos != NULL) {
target->rtos->current_threadid = target->rtos->current_thread;
target->rtos->gdb_target_for_threadid(connection, target->rtos->current_threadid, &ct);
} else {
ct = target;
}
if (gdb_connection->ctrl_c) {
signal_var = 0x2;
} else
signal_var = gdb_last_signal(target);
signal_var = gdb_last_signal(ct);
stop_reason[0] = '\0';
if (target->debug_reason == DBG_REASON_WATCHPOINT) {
if (ct->debug_reason == DBG_REASON_WATCHPOINT) {
enum watchpoint_rw hit_wp_type;
target_addr_t hit_wp_address;
if (watchpoint_hit(target, &hit_wp_type, &hit_wp_address) == ERROR_OK) {
if (watchpoint_hit(ct, &hit_wp_type, &hit_wp_address) == ERROR_OK) {
switch (hit_wp_type) {
case WPT_WRITE:
@ -767,15 +775,9 @@ static void gdb_signal_reply(struct target *target, struct connection *connectio
}
current_thread[0] = '\0';
if (target->rtos != NULL) {
struct target *ct;
snprintf(current_thread, sizeof(current_thread), "thread:%016" PRIx64 ";",
if (target->rtos != NULL)
snprintf(current_thread, sizeof(current_thread), "thread:%" PRIx64 ";",
target->rtos->current_thread);
target->rtos->current_threadid = target->rtos->current_thread;
target->rtos->gdb_target_for_threadid(connection, target->rtos->current_threadid, &ct);
if (!gdb_connection->ctrl_c)
signal_var = gdb_last_signal(ct);
}
sig_reply_len = snprintf(sig_reply, sizeof(sig_reply), "T%2.2x%s%s",
signal_var, stop_reason, current_thread);
@ -1300,7 +1302,7 @@ static int gdb_get_register_packet(struct connection *connection,
if ((target->rtos != NULL) && (ERROR_OK == rtos_get_gdb_reg(connection, reg_num)))
return ERROR_OK;
retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size,
retval = target_get_gdb_reg_list_noread(target, &reg_list, &reg_list_size,
REG_CLASS_ALL);
if (retval != ERROR_OK)
return gdb_error(connection, retval);
@ -1336,37 +1338,49 @@ static int gdb_set_register_packet(struct connection *connection,
{
struct target *target = get_target_from_connection(connection);
char *separator;
uint8_t *bin_buf;
int reg_num = strtoul(packet + 1, &separator, 16);
struct reg **reg_list;
int reg_list_size;
int retval;
#ifdef _DEBUG_GDB_IO_
LOG_DEBUG("-");
retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size,
REG_CLASS_ALL);
if (retval != ERROR_OK)
return gdb_error(connection, retval);
if (reg_list_size <= reg_num) {
LOG_ERROR("gdb requested a non-existing register");
return ERROR_SERVER_REMOTE_CLOSED;
}
#endif
if (*separator != '=') {
LOG_ERROR("GDB 'set register packet', but no '=' following the register number");
return ERROR_SERVER_REMOTE_CLOSED;
}
size_t chars = strlen(separator + 1);
uint8_t *bin_buf = malloc(chars / 2);
gdb_target_to_reg(target, separator + 1, chars, bin_buf);
/* convert from GDB-string (target-endian) to hex-string (big-endian) */
bin_buf = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8));
int chars = (DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);
if ((unsigned int)chars != strlen(separator + 1)) {
LOG_ERROR("gdb sent %zu bits for a %d-bit register (%s)",
strlen(separator + 1) * 4, chars * 4, reg_list[reg_num]->name);
if ((target->rtos != NULL) &&
(ERROR_OK == rtos_set_reg(connection, reg_num, bin_buf))) {
free(bin_buf);
gdb_put_packet(connection, "OK", 2);
return ERROR_OK;
}
retval = target_get_gdb_reg_list_noread(target, &reg_list, &reg_list_size,
REG_CLASS_ALL);
if (retval != ERROR_OK) {
free(bin_buf);
return gdb_error(connection, retval);
}
if (reg_list_size <= reg_num) {
LOG_ERROR("gdb requested a non-existing register");
free(bin_buf);
free(reg_list);
return ERROR_SERVER_REMOTE_CLOSED;
}
if (chars != (DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2)) {
LOG_ERROR("gdb sent %d bits for a %d-bit register (%s)",
(int) chars * 4, reg_list[reg_num]->size, reg_list[reg_num]->name);
free(bin_buf);
free(reg_list);
return ERROR_SERVER_REMOTE_CLOSED;
}
@ -1634,7 +1648,7 @@ static int gdb_breakpoint_watchpoint_packet(struct connection *connection,
char *separator;
int retval;
LOG_DEBUG("-");
LOG_DEBUG("[%s]", target_name(target));
type = strtoul(packet + 1, &separator, 16);
@ -2200,7 +2214,7 @@ static int gdb_generate_target_description(struct target *target, char **tdesc_o
arch_defined_types = calloc(1, sizeof(char *));
retval = target_get_gdb_reg_list(target, &reg_list,
retval = target_get_gdb_reg_list_noread(target, &reg_list,
&reg_list_size, REG_CLASS_ALL);
if (retval != ERROR_OK) {
@ -2388,7 +2402,7 @@ static int gdb_target_description_supported(struct target *target, int *supporte
char const *architecture = target_get_gdb_arch(target);
retval = target_get_gdb_reg_list(target, &reg_list,
retval = target_get_gdb_reg_list_noread(target, &reg_list,
&reg_list_size, REG_CLASS_ALL);
if (retval != ERROR_OK) {
LOG_ERROR("get register list failed");
@ -2783,13 +2797,11 @@ static bool gdb_handle_vcont_packet(struct connection *connection, const char *p
if (parse[0] == 'c') {
parse += 1;
packet_size -= 1;
/* check if thread-id follows */
if (parse[0] == ':') {
int64_t tid;
parse += 1;
packet_size -= 1;
tid = strtoll(parse, &endp, 16);
if (tid == thread_id) {
@ -2879,10 +2891,9 @@ static int gdb_v_packet(struct connection *connection,
char const *packet, int packet_size)
{
struct gdb_connection *gdb_connection = connection->priv;
struct target *target;
int result;
target = get_target_from_connection(connection);
struct target *target = get_target_from_connection(connection);
if (strncmp(packet, "vCont", 5) == 0) {
bool handled;

23
src/target/register.c
View File

@ -36,6 +36,29 @@
* may be separate registers associated with debug or trace modules.
*/
struct reg *register_get_by_number(struct reg_cache *first,
uint32_t reg_num, bool search_all)
{
unsigned i;
struct reg_cache *cache = first;
while (cache) {
for (i = 0; i < cache->num_regs; i++) {
if (cache->reg_list[i].exist == false)
continue;
if (cache->reg_list[i].number == reg_num)
return &(cache->reg_list[i]);
}
if (search_all)
cache = cache->next;
else
break;
}
return NULL;
}
struct reg *register_get_by_name(struct reg_cache *first,
const char *name, bool search_all)
{

2
src/target/register.h
View File

@ -159,6 +159,8 @@ struct reg_arch_type {
int (*set)(struct reg *reg, uint8_t *buf);
};
struct reg *register_get_by_number(struct reg_cache *first,
uint32_t reg_num, bool search_all);
struct reg *register_get_by_name(struct reg_cache *first,
const char *name, bool search_all);
struct reg_cache **register_get_last_cache_p(struct reg_cache **first);

24
src/target/target.c
View File

@ -1215,7 +1215,24 @@ int target_get_gdb_reg_list(struct target *target,
struct reg **reg_list[], int *reg_list_size,
enum target_register_class reg_class)
{
return target->type->get_gdb_reg_list(target, reg_list, reg_list_size, reg_class);
int result = target->type->get_gdb_reg_list(target, reg_list,
reg_list_size, reg_class);
if (result != ERROR_OK) {
*reg_list = NULL;
*reg_list_size = 0;
}
return result;
}
int target_get_gdb_reg_list_noread(struct target *target,
struct reg **reg_list[], int *reg_list_size,
enum target_register_class reg_class)
{
if (target->type->get_gdb_reg_list_noread &&
target->type->get_gdb_reg_list_noread(target, reg_list,
reg_list_size, reg_class) == ERROR_OK)
return ERROR_OK;
return target_get_gdb_reg_list(target, reg_list, reg_list_size, reg_class);
}
bool target_supports_gdb_connection(struct target *target)
@ -1587,8 +1604,9 @@ int target_call_event_callbacks(struct target *target, enum target_event event)
target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
}
LOG_DEBUG("target event %i (%s)", event,
Jim_Nvp_value2name_simple(nvp_target_event, event)->name);
LOG_DEBUG("target event %i (%s) for core %s", event,
Jim_Nvp_value2name_simple(nvp_target_event, event)->name,
target_name(target));
target_handle_event(target, event);

10
src/target/target.h
View File

@ -502,6 +502,16 @@ int target_get_gdb_reg_list(struct target *target,
struct reg **reg_list[], int *reg_list_size,
enum target_register_class reg_class);
/**
* Obtain the registers for GDB, but don't read register values from the
* target.
*
* This routine is a wrapper for target->type->get_gdb_reg_list_noread.
*/
int target_get_gdb_reg_list_noread(struct target *target,
struct reg **reg_list[], int *reg_list_size,
enum target_register_class reg_class);
/**
* Check if @a target allows GDB connections.
*

7
src/target/target_type.h
View File

@ -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>