@@ -2735,6 +2735,7 @@ S: Maintained
F: docs/system/gdb.rst
F: gdbstub/*
F: include/exec/gdbstub.h
+F: include/gdbstub/*
F: gdb-xml/
F: tests/tcg/multiarch/gdbstub/
F: scripts/feature_to_c.sh
@@ -117,6 +117,22 @@ int gdb_get_cpu_index(CPUState *cpu);
void gdb_create_default_process(GDBState *s);
+/* signal mapping, common for softmmu, specialised for user-mode */
+int gdb_signal_to_target(int sig);
+int gdb_target_signal_to_gdb(int sig);
+
+int gdb_get_char(void); /* user only */
+
+/**
+ * gdb_continue() - handle continue in mode specific way.
+ */
+void gdb_continue(void);
+
+/**
+ * gdb_continue_partial() - handle partial continue in mode specific way.
+ */
+int gdb_continue_partial(char *newstates);
+
/*
* Helpers with separate softmmu and user implementations
*/
@@ -149,6 +165,8 @@ typedef union GdbCmdVariant {
#define get_param(p, i) (&g_array_index(p, GdbCmdVariant, i))
void gdb_handle_query_rcmd(GArray *params, void *user_ctx); /* softmmu */
+void gdb_handle_query_offsets(GArray *params, void *user_ctx); /* user */
+void gdb_handle_query_xfer_auxv(GArray *params, void *user_ctx); /*user */
/*
* Break/Watch point support - there is an implementation for softmmu
@@ -103,27 +103,6 @@ void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...);
void gdb_do_syscallv(gdb_syscall_complete_cb cb, const char *fmt, va_list va);
int use_gdb_syscalls(void);
-#ifdef CONFIG_USER_ONLY
-/**
- * gdb_handlesig: yield control to gdb
- * @cpu: CPU
- * @sig: if non-zero, the signal number which caused us to stop
- *
- * This function yields control to gdb, when a user-mode-only target
- * needs to stop execution. If @sig is non-zero, then we will send a
- * stop packet to tell gdb that we have stopped because of this signal.
- *
- * This function will block (handling protocol requests from gdb)
- * until gdb tells us to continue target execution. When it does
- * return, the return value is a signal to deliver to the target,
- * or 0 if no signal should be delivered, ie the signal that caused
- * us to stop should be ignored.
- */
-int gdb_handlesig(CPUState *, int);
-void gdb_signalled(CPUArchState *, int);
-void gdbserver_fork(CPUState *);
-#endif
-
/* Get or set a register. Returns the size of the register. */
typedef int (*gdb_get_reg_cb)(CPUArchState *env, GByteArray *buf, int reg);
typedef int (*gdb_set_reg_cb)(CPUArchState *env, uint8_t *buf, int reg);
new file mode 100644
@@ -0,0 +1,43 @@
+/*
+ * gdbstub user-mode only APIs
+ *
+ * Copyright (c) 2022 Linaro Ltd
+ *
+ * SPDX-License-Identifier: LGPL-2.0+
+ */
+
+#ifndef GDBSTUB_USER_H
+#define GDBSTUB_USER_H
+
+/**
+ * gdb_handlesig() - yield control to gdb
+ * @cpu: CPU
+ * @sig: if non-zero, the signal number which caused us to stop
+ *
+ * This function yields control to gdb, when a user-mode-only target
+ * needs to stop execution. If @sig is non-zero, then we will send a
+ * stop packet to tell gdb that we have stopped because of this signal.
+ *
+ * This function will block (handling protocol requests from gdb)
+ * until gdb tells us to continue target execution. When it does
+ * return, the return value is a signal to deliver to the target,
+ * or 0 if no signal should be delivered, ie the signal that caused
+ * us to stop should be ignored.
+ */
+int gdb_handlesig(CPUState *, int);
+
+/**
+ * gdb_signalled() - inform remote gdb of sig exit
+ * @as: current CPUArchState
+ * @sig: signal number
+ */
+void gdb_signalled(CPUArchState *as, int sig);
+
+/**
+ * gdbserver_fork() - disable gdb stub for child processes.
+ * @cs: CPU
+ */
+void gdbserver_fork(CPUState *cs);
+
+
+#endif /* GDBSTUB_USER_H */
@@ -30,13 +30,12 @@
#include "trace.h"
#include "exec/gdbstub.h"
#ifdef CONFIG_USER_ONLY
-#include "qemu.h"
+#include "gdbstub/user.h"
#else
#include "hw/cpu/cluster.h"
#include "hw/boards.h"
#endif
-#include "qemu/sockets.h"
#include "sysemu/hw_accel.h"
#include "sysemu/runstate.h"
#include "semihosting/semihost.h"
@@ -80,223 +79,6 @@ static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr,
return cpu_memory_rw_debug(cpu, addr, buf, len, is_write);
}
-/*
- * Return the GDB index for a given vCPU state.
- *
- * For user mode this is simply the thread id.
- */
-#if defined(CONFIG_USER_ONLY)
-int gdb_get_cpu_index(CPUState *cpu)
-{
- TaskState *ts = (TaskState *) cpu->opaque;
- return ts ? ts->ts_tid : -1;
-}
-#endif
-
-#ifdef CONFIG_USER_ONLY
-
-/* Map target signal numbers to GDB protocol signal numbers and vice
- * versa. For user emulation's currently supported systems, we can
- * assume most signals are defined.
- */
-
-static int gdb_signal_table[] = {
- 0,
- TARGET_SIGHUP,
- TARGET_SIGINT,
- TARGET_SIGQUIT,
- TARGET_SIGILL,
- TARGET_SIGTRAP,
- TARGET_SIGABRT,
- -1, /* SIGEMT */
- TARGET_SIGFPE,
- TARGET_SIGKILL,
- TARGET_SIGBUS,
- TARGET_SIGSEGV,
- TARGET_SIGSYS,
- TARGET_SIGPIPE,
- TARGET_SIGALRM,
- TARGET_SIGTERM,
- TARGET_SIGURG,
- TARGET_SIGSTOP,
- TARGET_SIGTSTP,
- TARGET_SIGCONT,
- TARGET_SIGCHLD,
- TARGET_SIGTTIN,
- TARGET_SIGTTOU,
- TARGET_SIGIO,
- TARGET_SIGXCPU,
- TARGET_SIGXFSZ,
- TARGET_SIGVTALRM,
- TARGET_SIGPROF,
- TARGET_SIGWINCH,
- -1, /* SIGLOST */
- TARGET_SIGUSR1,
- TARGET_SIGUSR2,
-#ifdef TARGET_SIGPWR
- TARGET_SIGPWR,
-#else
- -1,
-#endif
- -1, /* SIGPOLL */
- -1,
- -1,
- -1,
- -1,
- -1,
- -1,
- -1,
- -1,
- -1,
- -1,
- -1,
-#ifdef __SIGRTMIN
- __SIGRTMIN + 1,
- __SIGRTMIN + 2,
- __SIGRTMIN + 3,
- __SIGRTMIN + 4,
- __SIGRTMIN + 5,
- __SIGRTMIN + 6,
- __SIGRTMIN + 7,
- __SIGRTMIN + 8,
- __SIGRTMIN + 9,
- __SIGRTMIN + 10,
- __SIGRTMIN + 11,
- __SIGRTMIN + 12,
- __SIGRTMIN + 13,
- __SIGRTMIN + 14,
- __SIGRTMIN + 15,
- __SIGRTMIN + 16,
- __SIGRTMIN + 17,
- __SIGRTMIN + 18,
- __SIGRTMIN + 19,
- __SIGRTMIN + 20,
- __SIGRTMIN + 21,
- __SIGRTMIN + 22,
- __SIGRTMIN + 23,
- __SIGRTMIN + 24,
- __SIGRTMIN + 25,
- __SIGRTMIN + 26,
- __SIGRTMIN + 27,
- __SIGRTMIN + 28,
- __SIGRTMIN + 29,
- __SIGRTMIN + 30,
- __SIGRTMIN + 31,
- -1, /* SIGCANCEL */
- __SIGRTMIN,
- __SIGRTMIN + 32,
- __SIGRTMIN + 33,
- __SIGRTMIN + 34,
- __SIGRTMIN + 35,
- __SIGRTMIN + 36,
- __SIGRTMIN + 37,
- __SIGRTMIN + 38,
- __SIGRTMIN + 39,
- __SIGRTMIN + 40,
- __SIGRTMIN + 41,
- __SIGRTMIN + 42,
- __SIGRTMIN + 43,
- __SIGRTMIN + 44,
- __SIGRTMIN + 45,
- __SIGRTMIN + 46,
- __SIGRTMIN + 47,
- __SIGRTMIN + 48,
- __SIGRTMIN + 49,
- __SIGRTMIN + 50,
- __SIGRTMIN + 51,
- __SIGRTMIN + 52,
- __SIGRTMIN + 53,
- __SIGRTMIN + 54,
- __SIGRTMIN + 55,
- __SIGRTMIN + 56,
- __SIGRTMIN + 57,
- __SIGRTMIN + 58,
- __SIGRTMIN + 59,
- __SIGRTMIN + 60,
- __SIGRTMIN + 61,
- __SIGRTMIN + 62,
- __SIGRTMIN + 63,
- __SIGRTMIN + 64,
- __SIGRTMIN + 65,
- __SIGRTMIN + 66,
- __SIGRTMIN + 67,
- __SIGRTMIN + 68,
- __SIGRTMIN + 69,
- __SIGRTMIN + 70,
- __SIGRTMIN + 71,
- __SIGRTMIN + 72,
- __SIGRTMIN + 73,
- __SIGRTMIN + 74,
- __SIGRTMIN + 75,
- __SIGRTMIN + 76,
- __SIGRTMIN + 77,
- __SIGRTMIN + 78,
- __SIGRTMIN + 79,
- __SIGRTMIN + 80,
- __SIGRTMIN + 81,
- __SIGRTMIN + 82,
- __SIGRTMIN + 83,
- __SIGRTMIN + 84,
- __SIGRTMIN + 85,
- __SIGRTMIN + 86,
- __SIGRTMIN + 87,
- __SIGRTMIN + 88,
- __SIGRTMIN + 89,
- __SIGRTMIN + 90,
- __SIGRTMIN + 91,
- __SIGRTMIN + 92,
- __SIGRTMIN + 93,
- __SIGRTMIN + 94,
- __SIGRTMIN + 95,
- -1, /* SIGINFO */
- -1, /* UNKNOWN */
- -1, /* DEFAULT */
- -1,
- -1,
- -1,
- -1,
- -1,
- -1
-#endif
-};
-#else
-/* In system mode we only need SIGINT and SIGTRAP; other signals
- are not yet supported. */
-
-enum {
- TARGET_SIGINT = 2,
- TARGET_SIGTRAP = 5
-};
-
-static int gdb_signal_table[] = {
- -1,
- -1,
- TARGET_SIGINT,
- -1,
- -1,
- TARGET_SIGTRAP
-};
-#endif
-
-#ifdef CONFIG_USER_ONLY
-static int target_signal_to_gdb (int sig)
-{
- int i;
- for (i = 0; i < ARRAY_SIZE (gdb_signal_table); i++)
- if (gdb_signal_table[i] == sig)
- return i;
- return GDB_SIGNAL_UNKNOWN;
-}
-#endif
-
-static int gdb_signal_to_target (int sig)
-{
- if (sig < ARRAY_SIZE (gdb_signal_table))
- return gdb_signal_table[sig];
- else
- return -1;
-}
-
typedef struct GDBRegisterState {
int base_reg;
int num_regs;
@@ -306,15 +88,6 @@ typedef struct GDBRegisterState {
struct GDBRegisterState *next;
} GDBRegisterState;
-#ifdef CONFIG_USER_ONLY
-typedef struct {
- int fd;
- char *socket_path;
- int running_state;
-} GDBUserState;
-static GDBUserState gdbserver_user_state;
-#endif
-
GDBState gdbserver_state;
void gdb_init_gdbserver_state(void)
@@ -338,34 +111,6 @@ void gdb_init_gdbserver_state(void)
bool gdb_has_xml;
-#ifdef CONFIG_USER_ONLY
-
-static int 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;
-}
-#endif
-
/*
* Return true if there is a GDB currently connected to the stub
* and attached to a CPU
@@ -410,104 +155,6 @@ static bool stub_can_reverse(void)
#endif
}
-/* Resume execution. */
-static void gdb_continue(void)
-{
-
-#ifdef CONFIG_USER_ONLY
- gdbserver_user_state.running_state = 1;
- trace_gdbstub_op_continue();
-#else
- if (!runstate_needs_reset()) {
- trace_gdbstub_op_continue();
- vm_start();
- }
-#endif
-}
-
-/*
- * Resume execution, per CPU actions. For user-mode emulation it's
- * equivalent to gdb_continue.
- */
-static int gdb_continue_partial(char *newstates)
-{
- CPUState *cpu;
- int res = 0;
-#ifdef CONFIG_USER_ONLY
- /*
- * 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;
-#else
- int flag = 0;
-
- if (!runstate_needs_reset()) {
- bool step_requested = false;
- CPU_FOREACH(cpu) {
- if (newstates[cpu->cpu_index] == 's') {
- step_requested = true;
- break;
- }
- }
-
- if (vm_prepare_start(step_requested)) {
- return 0;
- }
-
- CPU_FOREACH(cpu) {
- switch (newstates[cpu->cpu_index]) {
- case 0:
- case 1:
- break; /* nothing to do here */
- case 's':
- trace_gdbstub_op_stepping(cpu->cpu_index);
- cpu_single_step(cpu, gdbserver_state.sstep_flags);
- cpu_resume(cpu);
- flag = 1;
- break;
- case 'c':
- trace_gdbstub_op_continue_cpu(cpu->cpu_index);
- cpu_resume(cpu);
- flag = 1;
- break;
- default:
- res = -1;
- break;
- }
- }
- }
- if (flag) {
- qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
- }
-#endif
- return res;
-}
-
-#ifdef CONFIG_USER_ONLY
-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;
- }
- }
-}
-#endif
-
/* writes 2*len+1 bytes in buf */
void gdb_memtohex(GString *buf, const uint8_t *mem, int len)
{
@@ -593,7 +240,7 @@ int gdb_put_packet_binary(const char *buf, int len, bool dump)
gdbserver_state.last_packet->len);
#ifdef CONFIG_USER_ONLY
- i = get_char();
+ i = gdb_get_char();
if (i < 0)
return -1;
if (i == '+')
@@ -1950,23 +1597,6 @@ static void handle_query_thread_extra(GArray *params, void *user_ctx)
gdb_put_strbuf();
}
-#ifdef CONFIG_USER_ONLY
-static void handle_query_offsets(GArray *params, void *user_ctx)
-{
- TaskState *ts;
-
- ts = gdbserver_state.c_cpu->opaque;
- g_string_printf(gdbserver_state.str_buf,
- "Text=" TARGET_ABI_FMT_lx
- ";Data=" TARGET_ABI_FMT_lx
- ";Bss=" TARGET_ABI_FMT_lx,
- ts->info->code_offset,
- ts->info->data_offset,
- ts->info->data_offset);
- gdb_put_strbuf();
-}
-#endif
-
static void handle_query_supported(GArray *params, void *user_ctx)
{
CPUClass *cc;
@@ -2049,53 +1679,6 @@ static void handle_query_xfer_features(GArray *params, void *user_ctx)
gdbserver_state.str_buf->len, true);
}
-#if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX_USER)
-static void handle_query_xfer_auxv(GArray *params, void *user_ctx)
-{
- TaskState *ts;
- unsigned long offset, len, saved_auxv, auxv_len;
-
- if (params->len < 2) {
- gdb_put_packet("E22");
- return;
- }
-
- offset = get_param(params, 0)->val_ul;
- len = get_param(params, 1)->val_ul;
- ts = gdbserver_state.c_cpu->opaque;
- saved_auxv = ts->info->saved_auxv;
- auxv_len = ts->info->auxv_len;
-
- if (offset >= auxv_len) {
- gdb_put_packet("E00");
- return;
- }
-
- if (len > (MAX_PACKET_LENGTH - 5) / 2) {
- len = (MAX_PACKET_LENGTH - 5) / 2;
- }
-
- if (len < auxv_len - offset) {
- g_string_assign(gdbserver_state.str_buf, "m");
- } else {
- g_string_assign(gdbserver_state.str_buf, "l");
- len = auxv_len - offset;
- }
-
- g_byte_array_set_size(gdbserver_state.mem_buf, len);
- if (target_memory_rw_debug(gdbserver_state.g_cpu, saved_auxv + offset,
- gdbserver_state.mem_buf->data, len, false)) {
- gdb_put_packet("E14");
- return;
- }
-
- gdb_memtox(gdbserver_state.str_buf,
- (const char *)gdbserver_state.mem_buf->data, len);
- gdb_put_packet_binary(gdbserver_state.str_buf->str,
- gdbserver_state.str_buf->len, true);
-}
-#endif
-
static void handle_query_attached(GArray *params, void *user_ctx)
{
gdb_put_packet(GDB_ATTACHED);
@@ -2173,7 +1756,7 @@ static const GdbCmdParseEntry gdb_gen_query_table[] = {
},
#ifdef CONFIG_USER_ONLY
{
- .handler = handle_query_offsets,
+ .handler = gdb_handle_query_offsets,
.cmd = "Offsets",
},
#else
@@ -2203,7 +1786,7 @@ static const GdbCmdParseEntry gdb_gen_query_table[] = {
},
#if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX_USER)
{
- .handler = handle_query_xfer_auxv,
+ .handler = gdb_handle_query_xfer_auxv,
.cmd = "Xfer:auxv:read::",
.cmd_startswith = 1,
.schema = "l,l0"
@@ -2791,29 +2374,6 @@ void gdb_read_byte(uint8_t ch)
}
}
-#ifdef CONFIG_USER_ONLY
-/* 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);
-}
-#endif
-
/*
* Create the process that will contain all the "orphan" CPUs (that are not
* part of a CPU cluster). Note that if this process contains no CPUs, it won't
@@ -2839,233 +2399,3 @@ void gdb_create_default_process(GDBState *s)
process->target_xml[0] = '\0';
}
-#ifdef CONFIG_USER_ONLY
-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:", 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", 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);
- cpu_watchpoint_remove_all(cpu, BP_GDB);
-}
-#endif
@@ -434,6 +434,96 @@ void gdb_handle_query_rcmd(GArray *params, void *user_ctx)
gdb_put_packet("OK");
}
+/*
+ * Execution state helpers
+ */
+
+void gdb_continue(void)
+{
+ if (!runstate_needs_reset()) {
+ trace_gdbstub_op_continue();
+ vm_start();
+ }
+}
+
+/*
+ * Resume execution, per CPU actions.
+ */
+int gdb_continue_partial(char *newstates)
+{
+ CPUState *cpu;
+ int res = 0;
+ int flag = 0;
+
+ if (!runstate_needs_reset()) {
+ bool step_requested = false;
+ CPU_FOREACH(cpu) {
+ if (newstates[cpu->cpu_index] == 's') {
+ step_requested = true;
+ break;
+ }
+ }
+
+ if (vm_prepare_start(step_requested)) {
+ return 0;
+ }
+
+ CPU_FOREACH(cpu) {
+ switch (newstates[cpu->cpu_index]) {
+ case 0:
+ case 1:
+ break; /* nothing to do here */
+ case 's':
+ trace_gdbstub_op_stepping(cpu->cpu_index);
+ cpu_single_step(cpu, gdbserver_state.sstep_flags);
+ cpu_resume(cpu);
+ flag = 1;
+ break;
+ case 'c':
+ trace_gdbstub_op_continue_cpu(cpu->cpu_index);
+ cpu_resume(cpu);
+ flag = 1;
+ break;
+ default:
+ res = -1;
+ break;
+ }
+ }
+ }
+ if (flag) {
+ qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
+ }
+ return res;
+}
+
+/*
+ * Signal Handling - in system mode we only need SIGINT and SIGTRAP; other
+ * signals are not yet supported.
+ */
+
+enum {
+ TARGET_SIGINT = 2,
+ TARGET_SIGTRAP = 5
+};
+
+static int gdb_signal_table[] = {
+ -1,
+ -1,
+ TARGET_SIGINT,
+ -1,
+ -1,
+ TARGET_SIGTRAP
+};
+
+int gdb_signal_to_target(int sig)
+{
+ if (sig < ARRAY_SIZE(gdb_signal_table)) {
+ return gdb_signal_table[sig];
+ } else {
+ return -1;
+ }
+}
+
/*
* Break/Watch point helpers
*/
new file mode 100644
@@ -0,0 +1,283 @@
+/*
+ * Target specific user-mode handling
+ *
+ * Copyright (c) 2003-2005 Fabrice Bellard
+ * Copyright (c) 2022 Linaro Ltd
+ *
+ * SPDX-License-Identifier: LGPL-2.0+
+ */
+
+#include "qemu/osdep.h"
+#include "exec/gdbstub.h"
+#include "qemu.h"
+#include "internals.h"
+
+/*
+ * Map target signal numbers to GDB protocol signal numbers and vice
+ * versa. For user emulation's currently supported systems, we can
+ * assume most signals are defined.
+ */
+
+static int gdb_signal_table[] = {
+ 0,
+ TARGET_SIGHUP,
+ TARGET_SIGINT,
+ TARGET_SIGQUIT,
+ TARGET_SIGILL,
+ TARGET_SIGTRAP,
+ TARGET_SIGABRT,
+ -1, /* SIGEMT */
+ TARGET_SIGFPE,
+ TARGET_SIGKILL,
+ TARGET_SIGBUS,
+ TARGET_SIGSEGV,
+ TARGET_SIGSYS,
+ TARGET_SIGPIPE,
+ TARGET_SIGALRM,
+ TARGET_SIGTERM,
+ TARGET_SIGURG,
+ TARGET_SIGSTOP,
+ TARGET_SIGTSTP,
+ TARGET_SIGCONT,
+ TARGET_SIGCHLD,
+ TARGET_SIGTTIN,
+ TARGET_SIGTTOU,
+ TARGET_SIGIO,
+ TARGET_SIGXCPU,
+ TARGET_SIGXFSZ,
+ TARGET_SIGVTALRM,
+ TARGET_SIGPROF,
+ TARGET_SIGWINCH,
+ -1, /* SIGLOST */
+ TARGET_SIGUSR1,
+ TARGET_SIGUSR2,
+#ifdef TARGET_SIGPWR
+ TARGET_SIGPWR,
+#else
+ -1,
+#endif
+ -1, /* SIGPOLL */
+ -1,
+ -1,
+ -1,
+ -1,
+ -1,
+ -1,
+ -1,
+ -1,
+ -1,
+ -1,
+ -1,
+#ifdef __SIGRTMIN
+ __SIGRTMIN + 1,
+ __SIGRTMIN + 2,
+ __SIGRTMIN + 3,
+ __SIGRTMIN + 4,
+ __SIGRTMIN + 5,
+ __SIGRTMIN + 6,
+ __SIGRTMIN + 7,
+ __SIGRTMIN + 8,
+ __SIGRTMIN + 9,
+ __SIGRTMIN + 10,
+ __SIGRTMIN + 11,
+ __SIGRTMIN + 12,
+ __SIGRTMIN + 13,
+ __SIGRTMIN + 14,
+ __SIGRTMIN + 15,
+ __SIGRTMIN + 16,
+ __SIGRTMIN + 17,
+ __SIGRTMIN + 18,
+ __SIGRTMIN + 19,
+ __SIGRTMIN + 20,
+ __SIGRTMIN + 21,
+ __SIGRTMIN + 22,
+ __SIGRTMIN + 23,
+ __SIGRTMIN + 24,
+ __SIGRTMIN + 25,
+ __SIGRTMIN + 26,
+ __SIGRTMIN + 27,
+ __SIGRTMIN + 28,
+ __SIGRTMIN + 29,
+ __SIGRTMIN + 30,
+ __SIGRTMIN + 31,
+ -1, /* SIGCANCEL */
+ __SIGRTMIN,
+ __SIGRTMIN + 32,
+ __SIGRTMIN + 33,
+ __SIGRTMIN + 34,
+ __SIGRTMIN + 35,
+ __SIGRTMIN + 36,
+ __SIGRTMIN + 37,
+ __SIGRTMIN + 38,
+ __SIGRTMIN + 39,
+ __SIGRTMIN + 40,
+ __SIGRTMIN + 41,
+ __SIGRTMIN + 42,
+ __SIGRTMIN + 43,
+ __SIGRTMIN + 44,
+ __SIGRTMIN + 45,
+ __SIGRTMIN + 46,
+ __SIGRTMIN + 47,
+ __SIGRTMIN + 48,
+ __SIGRTMIN + 49,
+ __SIGRTMIN + 50,
+ __SIGRTMIN + 51,
+ __SIGRTMIN + 52,
+ __SIGRTMIN + 53,
+ __SIGRTMIN + 54,
+ __SIGRTMIN + 55,
+ __SIGRTMIN + 56,
+ __SIGRTMIN + 57,
+ __SIGRTMIN + 58,
+ __SIGRTMIN + 59,
+ __SIGRTMIN + 60,
+ __SIGRTMIN + 61,
+ __SIGRTMIN + 62,
+ __SIGRTMIN + 63,
+ __SIGRTMIN + 64,
+ __SIGRTMIN + 65,
+ __SIGRTMIN + 66,
+ __SIGRTMIN + 67,
+ __SIGRTMIN + 68,
+ __SIGRTMIN + 69,
+ __SIGRTMIN + 70,
+ __SIGRTMIN + 71,
+ __SIGRTMIN + 72,
+ __SIGRTMIN + 73,
+ __SIGRTMIN + 74,
+ __SIGRTMIN + 75,
+ __SIGRTMIN + 76,
+ __SIGRTMIN + 77,
+ __SIGRTMIN + 78,
+ __SIGRTMIN + 79,
+ __SIGRTMIN + 80,
+ __SIGRTMIN + 81,
+ __SIGRTMIN + 82,
+ __SIGRTMIN + 83,
+ __SIGRTMIN + 84,
+ __SIGRTMIN + 85,
+ __SIGRTMIN + 86,
+ __SIGRTMIN + 87,
+ __SIGRTMIN + 88,
+ __SIGRTMIN + 89,
+ __SIGRTMIN + 90,
+ __SIGRTMIN + 91,
+ __SIGRTMIN + 92,
+ __SIGRTMIN + 93,
+ __SIGRTMIN + 94,
+ __SIGRTMIN + 95,
+ -1, /* SIGINFO */
+ -1, /* UNKNOWN */
+ -1, /* DEFAULT */
+ -1,
+ -1,
+ -1,
+ -1,
+ -1,
+ -1
+#endif
+};
+
+int gdb_signal_to_target(int sig)
+{
+ if (sig < ARRAY_SIZE(gdb_signal_table)) {
+ return gdb_signal_table[sig];
+ } else {
+ return -1;
+ }
+}
+
+int gdb_target_signal_to_gdb(int sig)
+{
+ int i;
+ for (i = 0; i < ARRAY_SIZE(gdb_signal_table); i++) {
+ if (gdb_signal_table[i] == sig) {
+ return i;
+ }
+ }
+ return GDB_SIGNAL_UNKNOWN;
+}
+
+int gdb_get_cpu_index(CPUState *cpu)
+{
+ TaskState *ts = (TaskState *) cpu->opaque;
+ return ts ? ts->ts_tid : -1;
+}
+
+/*
+ * User-mode specific command helpers
+ */
+
+void gdb_handle_query_offsets(GArray *params, void *user_ctx)
+{
+ TaskState *ts;
+
+ ts = gdbserver_state.c_cpu->opaque;
+ g_string_printf(gdbserver_state.str_buf,
+ "Text=" TARGET_ABI_FMT_lx
+ ";Data=" TARGET_ABI_FMT_lx
+ ";Bss=" TARGET_ABI_FMT_lx,
+ ts->info->code_offset,
+ ts->info->data_offset,
+ ts->info->data_offset);
+ gdb_put_strbuf();
+}
+
+#if defined(CONFIG_LINUX)
+/* Partial user only duplicate of helper in gdbstub.c */
+static inline int target_memory_rw_debug(CPUState *cpu, target_ulong 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);
+}
+
+void gdb_handle_query_xfer_auxv(GArray *params, void *user_ctx)
+{
+ TaskState *ts;
+ unsigned long offset, len, saved_auxv, auxv_len;
+
+ if (params->len < 2) {
+ gdb_put_packet("E22");
+ return;
+ }
+
+ offset = get_param(params, 0)->val_ul;
+ len = get_param(params, 1)->val_ul;
+ ts = gdbserver_state.c_cpu->opaque;
+ saved_auxv = ts->info->saved_auxv;
+ auxv_len = ts->info->auxv_len;
+
+ if (offset >= auxv_len) {
+ gdb_put_packet("E00");
+ return;
+ }
+
+ if (len > (MAX_PACKET_LENGTH - 5) / 2) {
+ len = (MAX_PACKET_LENGTH - 5) / 2;
+ }
+
+ if (len < auxv_len - offset) {
+ g_string_assign(gdbserver_state.str_buf, "m");
+ } else {
+ g_string_assign(gdbserver_state.str_buf, "l");
+ len = auxv_len - offset;
+ }
+
+ g_byte_array_set_size(gdbserver_state.mem_buf, len);
+ if (target_memory_rw_debug(gdbserver_state.g_cpu, saved_auxv + offset,
+ gdbserver_state.mem_buf->data, len, false)) {
+ gdb_put_packet("E14");
+ return;
+ }
+
+ gdb_memtox(gdbserver_state.str_buf,
+ (const char *)gdbserver_state.mem_buf->data, len);
+ gdb_put_packet_binary(gdbserver_state.str_buf->str,
+ gdbserver_state.str_buf->len, true);
+}
+#endif
@@ -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 */
@@ -40,6 +40,7 @@
#include "qemu/plugin.h"
#include "exec/exec-all.h"
#include "exec/gdbstub.h"
+#include "gdbstub/user.h"
#include "tcg/tcg.h"
#include "qemu/timer.h"
#include "qemu/envlist.h"
@@ -18,7 +18,7 @@
*/
#include "qemu/osdep.h"
#include "qemu/bitops.h"
-#include "exec/gdbstub.h"
+#include "gdbstub/user.h"
#include "hw/core/tcg-cpu-ops.h"
#include <sys/ucontext.h>
@@ -7,3 +7,6 @@
specific_ss.add(files('gdbstub.c'))
softmmu_ss.add(files('softmmu.c'))
user_ss.add(files('user.c'))
+
+# The user-target is specialised by the guest
+specific_ss.add(when: 'CONFIG_USER_ONLY', if_true: files('user-target.c'))