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-rw-r--r--gdbstub/user.c344
1 files changed, 344 insertions, 0 deletions
diff --git a/gdbstub/user.c b/gdbstub/user.c
index 09a18fb..23b2e72 100644
--- a/gdbstub/user.c
+++ b/gdbstub/user.c
@@ -10,10 +10,354 @@
*/
#include "qemu/osdep.h"
+#include "qemu/cutils.h"
+#include "qemu/sockets.h"
+#include "exec/hwaddr.h"
+#include "exec/tb-flush.h"
#include "exec/gdbstub.h"
+#include "gdbstub/user.h"
#include "hw/core/cpu.h"
+#include "trace.h"
#include "internals.h"
+/* 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;
+}
+
+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
+ */
+
+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;
+}
+
+/*
+ * Break/Watch point helpers
+ */
+
bool gdb_supports_guest_debug(void)
{
/* user-mode == TCG == supported */
generated by cgit v1.1 at 2024-10-13 03:38:33 +0000