Signed-off-by: Doug Gale <doug...@gmail.com>
---
gdbstub.c | 100 ++++++++++++++++++++++++++++++++++++++---------------------
trace-events | 21 +++++++++++++
2 files changed, 86 insertions(+), 35 deletions(-)
diff --git a/gdbstub.c b/gdbstub.c
index 2a94030d3b..a75f319bd0 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -21,6 +21,7 @@
#include "qemu/error-report.h"
#include "qemu/cutils.h"
#include "cpu.h"
+#include "trace-root.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
#else
@@ -287,21 +288,6 @@ static int gdb_signal_to_target (int sig)
return -1;
}
-/* #define DEBUG_GDB */
-
-#ifdef DEBUG_GDB
-# define DEBUG_GDB_GATE 1
-#else
-# define DEBUG_GDB_GATE 0
-#endif
-
-#define gdb_debug(fmt, ...) do { \
- if (DEBUG_GDB_GATE) { \
- fprintf(stderr, "%s: " fmt, __func__, ## __VA_ARGS__); \
- } \
-} while (0)
-
-
typedef struct GDBRegisterState {
int base_reg;
int num_regs;
@@ -538,12 +524,47 @@ static void hextomem(uint8_t *mem, const char *buf, int
len)
}
}
+static void hexdump(const char *buf, int len,
+ void (*trace_fn)(size_t ofs, char const *text))
+{
+ char line_buffer[3 * 16 + 4 + 16 + 1];
+
+ for (size_t i = 0; i < len || (i & 0xF); ++i) {
+ size_t byte_ofs = i & 15;
+
+ if (byte_ofs == 0) {
+ memset(line_buffer, ' ', 3 * 16 + 4 + 16);
+ line_buffer[3 * 16 + 4 + 16] = 0;
+ }
+
+ size_t col_group = (i >> 2) & 3;
+ size_t hex_col = byte_ofs * 3 + col_group;
+ size_t txt_col = 3 * 16 + 4 + byte_ofs;
+
+ if (i < len) {
+ char value = buf[i];
+
+ line_buffer[hex_col + 0] = tohex((value >> 4) & 0xF);
+ line_buffer[hex_col + 1] = tohex((value >> 0) & 0xF);
+ line_buffer[txt_col + 0] = (value >= ' ' && value < 127)
+ ? value
+ : '.';
+ }
+
+ if (byte_ofs == 0xF)
+ trace_fn(i & -16, line_buffer);
+ }
+}
+
/* return -1 if error, 0 if OK */
-static int put_packet_binary(GDBState *s, const char *buf, int len)
+static int put_packet_binary(GDBState *s, const char *buf, int len, bool dump)
{
int csum, i;
uint8_t *p;
+ if (TRACE_GDBSTUB_IO_BINARYREPLY_ENABLED && dump)
+ hexdump(buf, len, trace_gdbstub_io_binaryreply);
+
for(;;) {
p = s->last_packet;
*(p++) = '$';
@@ -576,9 +597,9 @@ static int put_packet_binary(GDBState *s, const char *buf,
int len)
/* return -1 if error, 0 if OK */
static int put_packet(GDBState *s, const char *buf)
{
- gdb_debug("reply='%s'\n", buf);
+ trace_gdbstub_io_reply(buf);
- return put_packet_binary(s, buf, strlen(buf));
+ return put_packet_binary(s, buf, strlen(buf), false);
}
/* Encode data using the encoding for 'x' packets. */
@@ -975,8 +996,7 @@ static int gdb_handle_packet(GDBState *s, const char
*line_buf)
uint8_t *registers;
target_ulong addr, len;
-
- gdb_debug("command='%s'\n", line_buf);
+ trace_gdbstub_io_command(line_buf);
p = line_buf;
ch = *p++;
@@ -999,7 +1019,7 @@ static int gdb_handle_packet(GDBState *s, const char
*line_buf)
}
s->signal = 0;
gdb_continue(s);
- return RS_IDLE;
+ return RS_IDLE;
case 'C':
s->signal = gdb_signal_to_target (strtoul(p, (char **)&p, 16));
if (s->signal == -1)
@@ -1045,7 +1065,7 @@ static int gdb_handle_packet(GDBState *s, const char
*line_buf)
}
cpu_single_step(s->c_cpu, sstep_flags);
gdb_continue(s);
- return RS_IDLE;
+ return RS_IDLE;
case 'F':
{
target_ulong ret;
@@ -1267,6 +1287,7 @@ static int gdb_handle_packet(GDBState *s, const char
*line_buf)
len = snprintf((char *)mem_buf, sizeof(buf) / 2,
"CPU#%d [%s]", cpu->cpu_index,
cpu->halted ? "halted " : "running");
+ trace_gdbstub_op_extra_info((char *)mem_buf);
memtohex(buf, mem_buf, len);
put_packet(s, buf);
}
@@ -1350,7 +1371,7 @@ static int gdb_handle_packet(GDBState *s, const char
*line_buf)
buf[0] = 'l';
len = memtox(buf + 1, xml + addr, total_len - addr);
}
- put_packet_binary(s, buf, len + 1);
+ put_packet_binary(s, buf, len + 1, true);
break;
}
if (is_query_packet(p, "Attached", ':')) {
@@ -1407,6 +1428,8 @@ static void gdb_vm_state_change(void *opaque, int
running, RunState state)
type = "";
break;
}
+ trace_gdbstub_op_hit_watchpoint(type, cpu_gdb_index(cpu),
+ (target_ulong)cpu->watchpoint_hit->vaddr);
snprintf(buf, sizeof(buf),
"T%02xthread:%02x;%swatch:" TARGET_FMT_lx ";",
GDB_SIGNAL_TRAP, cpu_gdb_index(cpu), type,
@@ -1421,6 +1444,7 @@ static void gdb_vm_state_change(void *opaque, int
running, RunState state)
ret = GDB_SIGNAL_INT;
break;
case RUN_STATE_SHUTDOWN:
+ trace_gdbstub_op_hit_shutdown();
ret = GDB_SIGNAL_QUIT;
break;
case RUN_STATE_IO_ERROR:
@@ -1430,6 +1454,7 @@ static void gdb_vm_state_change(void *opaque, int
running, RunState state)
ret = GDB_SIGNAL_ALRM;
break;
case RUN_STATE_INTERNAL_ERROR:
+ trace_gdbstub_op_hit_internal_error();
ret = GDB_SIGNAL_ABRT;
break;
case RUN_STATE_SAVE_VM:
@@ -1439,6 +1464,7 @@ static void gdb_vm_state_change(void *opaque, int
running, RunState state)
ret = GDB_SIGNAL_XCPU;
break;
default:
+ trace_gdbstub_op_hit_unknown(state);
ret = GDB_SIGNAL_UNKNOWN;
break;
}
@@ -1538,12 +1564,12 @@ static void gdb_read_byte(GDBState *s, int ch)
/* Waiting for a response to the last packet. If we see the start
of a new command then abandon the previous response. */
if (ch == '-') {
- gdb_debug("Got NACK, retransmitting\n");
+ trace_gdbstub_err_got_nack();
put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len);
} else if (ch == '+') {
- gdb_debug("Got ACK\n");
+ trace_gdbstub_io_got_ack();
} else {
- gdb_debug("Got '%c' when expecting ACK/NACK\n", ch);
+ trace_gdbstub_io_got_unexpected(ch);
}
if (ch == '+' || ch == '$')
@@ -1566,7 +1592,7 @@ static void gdb_read_byte(GDBState *s, int ch)
s->line_sum = 0;
s->state = RS_GETLINE;
} else {
- gdb_debug("received garbage between packets: 0x%x\n", ch);
+ trace_gdbstub_err_garbage((uint8_t)ch);
}
break;
case RS_GETLINE:
@@ -1582,7 +1608,7 @@ static void gdb_read_byte(GDBState *s, int ch)
/* end of command, start of checksum*/
s->state = RS_CHKSUM1;
} else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
- gdb_debug("command buffer overrun, dropping command\n");
+ trace_gdbstub_err_overrun();
s->state = RS_IDLE;
} else {
/* unescaped command character */
@@ -1596,7 +1622,7 @@ static void gdb_read_byte(GDBState *s, int ch)
s->state = RS_CHKSUM1;
} else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
/* command buffer overrun */
- gdb_debug("command buffer overrun, dropping command\n");
+ trace_gdbstub_err_overrun();
s->state = RS_IDLE;
} else {
/* parse escaped character and leave escape state */
@@ -1608,18 +1634,18 @@ static void gdb_read_byte(GDBState *s, int ch)
case RS_GETLINE_RLE:
if (ch < ' ') {
/* invalid RLE count encoding */
- gdb_debug("got invalid RLE count: 0x%x\n", ch);
+ trace_gdbstub_err_invalid_repeat((uint8_t)ch);
s->state = RS_GETLINE;
} else {
/* decode repeat length */
int repeat = (unsigned char)ch - ' ' + 3;
if (s->line_buf_index + repeat >= sizeof(s->line_buf) - 1) {
/* that many repeats would overrun the command buffer */
- gdb_debug("command buffer overrun, dropping command\n");
+ trace_gdbstub_err_overrun();
s->state = RS_IDLE;
} else if (s->line_buf_index < 1) {
/* got a repeat but we have nothing to repeat */
- gdb_debug("got invalid RLE sequence\n");
+ trace_gdbstub_err_invalid_rle();
s->state = RS_GETLINE;
} else {
/* repeat the last character */
@@ -1634,7 +1660,7 @@ static void gdb_read_byte(GDBState *s, int ch)
case RS_CHKSUM1:
/* get high hex digit of checksum */
if (!isxdigit(ch)) {
- gdb_debug("got invalid command checksum digit\n");
+ trace_gdbstub_invalid_checksum((uint8_t)ch);
s->state = RS_GETLINE;
break;
}
@@ -1645,14 +1671,14 @@ static void gdb_read_byte(GDBState *s, int ch)
case RS_CHKSUM2:
/* get low hex digit of checksum */
if (!isxdigit(ch)) {
- gdb_debug("got invalid command checksum digit\n");
+ trace_gdbstub_invalid_checksum((uint8_t)ch);
s->state = RS_GETLINE;
break;
}
s->line_csum |= fromhex(ch);
if (s->line_csum != (s->line_sum & 0xff)) {
- gdb_debug("got command packet with incorrect checksum\n");
+ trace_gdbstub_incorrect_checksum(s->line_sum, s->line_csum);
/* send NAK reply */
reply = '-';
put_buffer(s, &reply, 1);
@@ -1686,6 +1712,8 @@ void gdb_exit(CPUArchState *env, int code)
}
#endif
+ trace_gdbstub_op_exiting((uint8_t)code);
+
snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
put_packet(s, buf);
@@ -1944,6 +1972,8 @@ static const TypeInfo char_gdb_type_info = {
int gdbserver_start(const char *device)
{
+ trace_gdbstub_op_start(device);
+
GDBState *s;
char gdbstub_device_name[128];
Chardev *chr = NULL;
diff --git a/trace-events b/trace-events
index 1d2eb5d3e4..abf068656e 100644
--- a/trace-events
+++ b/trace-events
@@ -68,6 +68,27 @@ flatview_new(FlatView *view, MemoryRegion *root) "%p (root
%p)"
flatview_destroy(FlatView *view, MemoryRegion *root) "%p (root %p)"
flatview_destroy_rcu(FlatView *view, MemoryRegion *root) "%p (root %p)"
+# gdbstub.c
+gdbstub_op_start(char const *device) "Starting gdbstub using device %s"
+gdbstub_op_exiting(uint8_t code) "notifying exit with code=0x%02x"
+gdbstub_op_hit_watchpoint(char const *type, int cpu_gdb_index, uint64_t vaddr)
"Watchpoint hit, type=\"%s\" cpu=%d, vaddr=0x%" PRIx64 ""
+gdbstub_op_hit_internal_error(void) "RUN_STATE_INTERNAL_ERROR"
+gdbstub_op_hit_shutdown(void) "RUN_STATE_SHUTDOWN"
+gdbstub_op_hit_unknown(int state) "Unknown run state=0x%x"
+gdbstub_op_extra_info(char const *info) "Thread extra info: %s"
+gdbstub_io_reply(char const *message) "Sent: %s"
+gdbstub_io_binaryreply(size_t ofs, char const *line) "0x%04zx: %s"
+gdbstub_io_command(char const *command) "Received: %s"
+gdbstub_err_got_nack(void) "Got NACK, retransmitting"
+gdbstub_io_got_ack(void) "Got ACK"
+gdbstub_io_got_unexpected(char ch) "Got '%c' when expecting ACK/NACK"
+gdbstub_err_garbage(char ch) "received garbage between packets: 0x%02x"
+gdbstub_err_overrun(void) "command buffer overrun, dropping command"
+gdbstub_err_invalid_repeat(char ch) "got invalid RLE count: 0x%02x"
+gdbstub_err_invalid_rle(void) "got invalid RLE sequence"
+gdbstub_invalid_checksum(char ch) "got invalid command checksum digit: 0x%02x"
+gdbstub_incorrect_checksum(unsigned char expected, unsigned char got) "got
command packet with incorrect checksum, expected=0x%02x, received=0x%02x"
+
### Guest events, keep at bottom
--
2.14.1
