2022-09-29 13:42:24 +02:00
|
|
|
/*
|
|
|
|
* gdbstub user-mode helper routines.
|
|
|
|
*
|
|
|
|
* We know for user-mode we are using TCG so we can call stuff directly.
|
|
|
|
*
|
2023-03-03 03:57:38 +01:00
|
|
|
* Copyright (c) 2003-2005 Fabrice Bellard
|
2022-09-29 13:42:24 +02:00
|
|
|
* Copyright (c) 2022 Linaro Ltd
|
|
|
|
*
|
2023-03-03 03:57:38 +01:00
|
|
|
* SPDX-License-Identifier: LGPL-2.0+
|
2022-09-29 13:42:24 +02:00
|
|
|
*/
|
|
|
|
|
|
|
|
#include "qemu/osdep.h"
|
2023-03-03 03:57:47 +01:00
|
|
|
#include "qemu/cutils.h"
|
|
|
|
#include "qemu/sockets.h"
|
|
|
|
#include "exec/hwaddr.h"
|
|
|
|
#include "exec/tb-flush.h"
|
2022-09-29 13:42:24 +02:00
|
|
|
#include "exec/gdbstub.h"
|
2023-03-03 03:57:57 +01:00
|
|
|
#include "gdbstub/syscalls.h"
|
2023-03-03 03:57:47 +01:00
|
|
|
#include "gdbstub/user.h"
|
2022-09-29 13:42:24 +02:00
|
|
|
#include "hw/core/cpu.h"
|
2023-03-03 03:57:47 +01:00
|
|
|
#include "trace.h"
|
2022-09-29 13:42:24 +02:00
|
|
|
#include "internals.h"
|
|
|
|
|
2023-03-03 03:57:47 +01:00
|
|
|
/* User-mode specific state */
|
|
|
|
typedef struct {
|
|
|
|
int fd;
|
|
|
|
char *socket_path;
|
|
|
|
int running_state;
|
|
|
|
} GDBUserState;
|
|
|
|
|
|
|
|
static GDBUserState gdbserver_user_state;
|
|
|
|
|
|
|
|
int gdb_get_char(void)
|
|
|
|
{
|
|
|
|
uint8_t ch;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
for (;;) {
|
|
|
|
ret = recv(gdbserver_user_state.fd, &ch, 1, 0);
|
|
|
|
if (ret < 0) {
|
|
|
|
if (errno == ECONNRESET) {
|
|
|
|
gdbserver_user_state.fd = -1;
|
|
|
|
}
|
|
|
|
if (errno != EINTR) {
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
} else if (ret == 0) {
|
|
|
|
close(gdbserver_user_state.fd);
|
|
|
|
gdbserver_user_state.fd = -1;
|
|
|
|
return -1;
|
|
|
|
} else {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return ch;
|
|
|
|
}
|
|
|
|
|
2023-03-03 03:57:49 +01:00
|
|
|
bool gdb_got_immediate_ack(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
i = gdb_get_char();
|
|
|
|
if (i < 0) {
|
|
|
|
/* no response, continue anyway */
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (i == '+') {
|
|
|
|
/* received correctly, continue */
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* anything else, including '-' then try again */
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
2023-03-03 03:57:47 +01:00
|
|
|
void gdb_put_buffer(const uint8_t *buf, int len)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
while (len > 0) {
|
|
|
|
ret = send(gdbserver_user_state.fd, buf, len, 0);
|
|
|
|
if (ret < 0) {
|
|
|
|
if (errno != EINTR) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
buf += ret;
|
|
|
|
len -= ret;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Tell the remote gdb that the process has exited. */
|
|
|
|
void gdb_exit(int code)
|
|
|
|
{
|
|
|
|
char buf[4];
|
|
|
|
|
|
|
|
if (!gdbserver_state.init) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (gdbserver_user_state.socket_path) {
|
|
|
|
unlink(gdbserver_user_state.socket_path);
|
|
|
|
}
|
|
|
|
if (gdbserver_user_state.fd < 0) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
trace_gdbstub_op_exiting((uint8_t)code);
|
|
|
|
|
|
|
|
snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
|
|
|
|
gdb_put_packet(buf);
|
|
|
|
}
|
|
|
|
|
|
|
|
int gdb_handlesig(CPUState *cpu, int sig)
|
|
|
|
{
|
|
|
|
char buf[256];
|
|
|
|
int n;
|
|
|
|
|
|
|
|
if (!gdbserver_state.init || gdbserver_user_state.fd < 0) {
|
|
|
|
return sig;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* disable single step if it was enabled */
|
|
|
|
cpu_single_step(cpu, 0);
|
|
|
|
tb_flush(cpu);
|
|
|
|
|
|
|
|
if (sig != 0) {
|
|
|
|
gdb_set_stop_cpu(cpu);
|
|
|
|
g_string_printf(gdbserver_state.str_buf,
|
|
|
|
"T%02xthread:", gdb_target_signal_to_gdb(sig));
|
|
|
|
gdb_append_thread_id(cpu, gdbserver_state.str_buf);
|
|
|
|
g_string_append_c(gdbserver_state.str_buf, ';');
|
|
|
|
gdb_put_strbuf();
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* gdb_put_packet() might have detected that the peer terminated the
|
|
|
|
* connection.
|
|
|
|
*/
|
|
|
|
if (gdbserver_user_state.fd < 0) {
|
|
|
|
return sig;
|
|
|
|
}
|
|
|
|
|
|
|
|
sig = 0;
|
|
|
|
gdbserver_state.state = RS_IDLE;
|
|
|
|
gdbserver_user_state.running_state = 0;
|
|
|
|
while (gdbserver_user_state.running_state == 0) {
|
|
|
|
n = read(gdbserver_user_state.fd, buf, 256);
|
|
|
|
if (n > 0) {
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < n; i++) {
|
|
|
|
gdb_read_byte(buf[i]);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* XXX: Connection closed. Should probably wait for another
|
|
|
|
* connection before continuing.
|
|
|
|
*/
|
|
|
|
if (n == 0) {
|
|
|
|
close(gdbserver_user_state.fd);
|
|
|
|
}
|
|
|
|
gdbserver_user_state.fd = -1;
|
|
|
|
return sig;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
sig = gdbserver_state.signal;
|
|
|
|
gdbserver_state.signal = 0;
|
|
|
|
return sig;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Tell the remote gdb that the process has exited due to SIG. */
|
|
|
|
void gdb_signalled(CPUArchState *env, int sig)
|
|
|
|
{
|
|
|
|
char buf[4];
|
|
|
|
|
|
|
|
if (!gdbserver_state.init || gdbserver_user_state.fd < 0) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
snprintf(buf, sizeof(buf), "X%02x", gdb_target_signal_to_gdb(sig));
|
|
|
|
gdb_put_packet(buf);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void gdb_accept_init(int fd)
|
|
|
|
{
|
|
|
|
gdb_init_gdbserver_state();
|
|
|
|
gdb_create_default_process(&gdbserver_state);
|
|
|
|
gdbserver_state.processes[0].attached = true;
|
|
|
|
gdbserver_state.c_cpu = gdb_first_attached_cpu();
|
|
|
|
gdbserver_state.g_cpu = gdbserver_state.c_cpu;
|
|
|
|
gdbserver_user_state.fd = fd;
|
|
|
|
gdb_has_xml = false;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool gdb_accept_socket(int gdb_fd)
|
|
|
|
{
|
|
|
|
int fd;
|
|
|
|
|
|
|
|
for (;;) {
|
|
|
|
fd = accept(gdb_fd, NULL, NULL);
|
|
|
|
if (fd < 0 && errno != EINTR) {
|
|
|
|
perror("accept socket");
|
|
|
|
return false;
|
|
|
|
} else if (fd >= 0) {
|
|
|
|
qemu_set_cloexec(fd);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
gdb_accept_init(fd);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int gdbserver_open_socket(const char *path)
|
|
|
|
{
|
|
|
|
struct sockaddr_un sockaddr = {};
|
|
|
|
int fd, ret;
|
|
|
|
|
|
|
|
fd = socket(AF_UNIX, SOCK_STREAM, 0);
|
|
|
|
if (fd < 0) {
|
|
|
|
perror("create socket");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
sockaddr.sun_family = AF_UNIX;
|
|
|
|
pstrcpy(sockaddr.sun_path, sizeof(sockaddr.sun_path) - 1, path);
|
|
|
|
ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
|
|
|
|
if (ret < 0) {
|
|
|
|
perror("bind socket");
|
|
|
|
close(fd);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
ret = listen(fd, 1);
|
|
|
|
if (ret < 0) {
|
|
|
|
perror("listen socket");
|
|
|
|
close(fd);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return fd;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool gdb_accept_tcp(int gdb_fd)
|
|
|
|
{
|
|
|
|
struct sockaddr_in sockaddr = {};
|
|
|
|
socklen_t len;
|
|
|
|
int fd;
|
|
|
|
|
|
|
|
for (;;) {
|
|
|
|
len = sizeof(sockaddr);
|
|
|
|
fd = accept(gdb_fd, (struct sockaddr *)&sockaddr, &len);
|
|
|
|
if (fd < 0 && errno != EINTR) {
|
|
|
|
perror("accept");
|
|
|
|
return false;
|
|
|
|
} else if (fd >= 0) {
|
|
|
|
qemu_set_cloexec(fd);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* set short latency */
|
|
|
|
if (socket_set_nodelay(fd)) {
|
|
|
|
perror("setsockopt");
|
|
|
|
close(fd);
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
gdb_accept_init(fd);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int gdbserver_open_port(int port)
|
|
|
|
{
|
|
|
|
struct sockaddr_in sockaddr;
|
|
|
|
int fd, ret;
|
|
|
|
|
|
|
|
fd = socket(PF_INET, SOCK_STREAM, 0);
|
|
|
|
if (fd < 0) {
|
|
|
|
perror("socket");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
qemu_set_cloexec(fd);
|
|
|
|
|
|
|
|
socket_set_fast_reuse(fd);
|
|
|
|
|
|
|
|
sockaddr.sin_family = AF_INET;
|
|
|
|
sockaddr.sin_port = htons(port);
|
|
|
|
sockaddr.sin_addr.s_addr = 0;
|
|
|
|
ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
|
|
|
|
if (ret < 0) {
|
|
|
|
perror("bind");
|
|
|
|
close(fd);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
ret = listen(fd, 1);
|
|
|
|
if (ret < 0) {
|
|
|
|
perror("listen");
|
|
|
|
close(fd);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return fd;
|
|
|
|
}
|
|
|
|
|
|
|
|
int gdbserver_start(const char *port_or_path)
|
|
|
|
{
|
|
|
|
int port = g_ascii_strtoull(port_or_path, NULL, 10);
|
|
|
|
int gdb_fd;
|
|
|
|
|
|
|
|
if (port > 0) {
|
|
|
|
gdb_fd = gdbserver_open_port(port);
|
|
|
|
} else {
|
|
|
|
gdb_fd = gdbserver_open_socket(port_or_path);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (gdb_fd < 0) {
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (port > 0 && gdb_accept_tcp(gdb_fd)) {
|
|
|
|
return 0;
|
|
|
|
} else if (gdb_accept_socket(gdb_fd)) {
|
|
|
|
gdbserver_user_state.socket_path = g_strdup(port_or_path);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* gone wrong */
|
|
|
|
close(gdb_fd);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Disable gdb stub for child processes. */
|
|
|
|
void gdbserver_fork(CPUState *cpu)
|
|
|
|
{
|
|
|
|
if (!gdbserver_state.init || gdbserver_user_state.fd < 0) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
close(gdbserver_user_state.fd);
|
|
|
|
gdbserver_user_state.fd = -1;
|
|
|
|
cpu_breakpoint_remove_all(cpu, BP_GDB);
|
|
|
|
/* no cpu_watchpoint_remove_all for user-mode */
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Execution state helpers
|
|
|
|
*/
|
|
|
|
|
2023-03-03 03:57:50 +01:00
|
|
|
void gdb_handle_query_attached(GArray *params, void *user_ctx)
|
|
|
|
{
|
|
|
|
gdb_put_packet("0");
|
|
|
|
}
|
|
|
|
|
2023-03-03 03:57:47 +01:00
|
|
|
void gdb_continue(void)
|
|
|
|
{
|
|
|
|
gdbserver_user_state.running_state = 1;
|
|
|
|
trace_gdbstub_op_continue();
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Resume execution, for user-mode emulation it's equivalent to
|
|
|
|
* gdb_continue.
|
|
|
|
*/
|
|
|
|
int gdb_continue_partial(char *newstates)
|
|
|
|
{
|
|
|
|
CPUState *cpu;
|
|
|
|
int res = 0;
|
|
|
|
/*
|
|
|
|
* This is not exactly accurate, but it's an improvement compared to the
|
|
|
|
* previous situation, where only one CPU would be single-stepped.
|
|
|
|
*/
|
|
|
|
CPU_FOREACH(cpu) {
|
|
|
|
if (newstates[cpu->cpu_index] == 's') {
|
|
|
|
trace_gdbstub_op_stepping(cpu->cpu_index);
|
|
|
|
cpu_single_step(cpu, gdbserver_state.sstep_flags);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
gdbserver_user_state.running_state = 1;
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
2023-03-03 03:57:51 +01:00
|
|
|
/*
|
|
|
|
* Memory access helpers
|
|
|
|
*/
|
|
|
|
int gdb_target_memory_rw_debug(CPUState *cpu, hwaddr addr,
|
|
|
|
uint8_t *buf, int len, bool is_write)
|
|
|
|
{
|
|
|
|
CPUClass *cc;
|
|
|
|
|
|
|
|
cc = CPU_GET_CLASS(cpu);
|
|
|
|
if (cc->memory_rw_debug) {
|
|
|
|
return cc->memory_rw_debug(cpu, addr, buf, len, is_write);
|
|
|
|
}
|
|
|
|
return cpu_memory_rw_debug(cpu, addr, buf, len, is_write);
|
|
|
|
}
|
|
|
|
|
2023-03-03 03:57:52 +01:00
|
|
|
/*
|
|
|
|
* cpu helpers
|
|
|
|
*/
|
|
|
|
|
|
|
|
unsigned int gdb_get_max_cpus(void)
|
|
|
|
{
|
|
|
|
CPUState *cpu;
|
|
|
|
unsigned int max_cpus = 1;
|
|
|
|
|
|
|
|
CPU_FOREACH(cpu) {
|
|
|
|
max_cpus = max_cpus <= cpu->cpu_index ? cpu->cpu_index + 1 : max_cpus;
|
|
|
|
}
|
|
|
|
|
|
|
|
return max_cpus;
|
|
|
|
}
|
|
|
|
|
2023-03-03 03:57:53 +01:00
|
|
|
/* replay not supported for user-mode */
|
|
|
|
bool gdb_can_reverse(void)
|
|
|
|
{
|
|
|
|
return false;
|
|
|
|
}
|
2023-03-03 03:57:52 +01:00
|
|
|
|
2023-03-03 03:57:47 +01:00
|
|
|
/*
|
|
|
|
* Break/Watch point helpers
|
|
|
|
*/
|
|
|
|
|
2022-09-29 13:42:25 +02:00
|
|
|
bool gdb_supports_guest_debug(void)
|
|
|
|
{
|
|
|
|
/* user-mode == TCG == supported */
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2022-12-06 16:20:27 +01:00
|
|
|
int gdb_breakpoint_insert(CPUState *cs, int type, vaddr addr, vaddr len)
|
2022-09-29 13:42:24 +02:00
|
|
|
{
|
|
|
|
CPUState *cpu;
|
|
|
|
int err = 0;
|
|
|
|
|
|
|
|
switch (type) {
|
|
|
|
case GDB_BREAKPOINT_SW:
|
|
|
|
case GDB_BREAKPOINT_HW:
|
|
|
|
CPU_FOREACH(cpu) {
|
|
|
|
err = cpu_breakpoint_insert(cpu, addr, BP_GDB, NULL);
|
|
|
|
if (err) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return err;
|
|
|
|
default:
|
|
|
|
/* user-mode doesn't support watchpoints */
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2022-12-06 16:20:27 +01:00
|
|
|
int gdb_breakpoint_remove(CPUState *cs, int type, vaddr addr, vaddr len)
|
2022-09-29 13:42:24 +02:00
|
|
|
{
|
|
|
|
CPUState *cpu;
|
|
|
|
int err = 0;
|
|
|
|
|
|
|
|
switch (type) {
|
|
|
|
case GDB_BREAKPOINT_SW:
|
|
|
|
case GDB_BREAKPOINT_HW:
|
|
|
|
CPU_FOREACH(cpu) {
|
|
|
|
err = cpu_breakpoint_remove(cpu, addr, BP_GDB);
|
|
|
|
if (err) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return err;
|
|
|
|
default:
|
|
|
|
/* user-mode doesn't support watchpoints */
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void gdb_breakpoint_remove_all(CPUState *cs)
|
|
|
|
{
|
|
|
|
cpu_breakpoint_remove_all(cs, BP_GDB);
|
|
|
|
}
|
2023-03-03 03:58:01 +01:00
|
|
|
|
|
|
|
/*
|
|
|
|
* For user-mode syscall support we send the system call immediately
|
|
|
|
* and then return control to gdb for it to process the syscall request.
|
|
|
|
* Since the protocol requires that gdb hands control back to us
|
|
|
|
* using a "here are the results" F packet, we don't need to check
|
|
|
|
* gdb_handlesig's return value (which is the signal to deliver if
|
|
|
|
* execution was resumed via a continue packet).
|
|
|
|
*/
|
|
|
|
void gdb_syscall_handling(const char *syscall_packet)
|
|
|
|
{
|
|
|
|
gdb_put_packet(syscall_packet);
|
|
|
|
gdb_handlesig(gdbserver_state.c_cpu, 0);
|
|
|
|
}
|