diff options
Diffstat (limited to 'gdbstub')
| -rw-r--r-- | gdbstub/gdbstub.c | 115 | ||||
| -rw-r--r-- | gdbstub/internals.h | 7 | ||||
| -rw-r--r-- | gdbstub/softmmu.c | 19 | ||||
| -rw-r--r-- | gdbstub/user-target.c | 137 |
4 files changed, 231 insertions, 47 deletions
diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c index be18568d0a..6911b73c07 100644 --- a/gdbstub/gdbstub.c +++ b/gdbstub/gdbstub.c @@ -202,16 +202,19 @@ void gdb_memtox(GString *buf, const char *mem, int len) static uint32_t gdb_get_cpu_pid(CPUState *cpu) { - /* TODO: In user mode, we should use the task state PID */ +#ifdef CONFIG_USER_ONLY + return getpid(); +#else if (cpu->cluster_index == UNASSIGNED_CLUSTER_INDEX) { /* Return the default process' PID */ int index = gdbserver_state.process_num - 1; return gdbserver_state.processes[index].pid; } return cpu->cluster_index + 1; +#endif } -static GDBProcess *gdb_get_process(uint32_t pid) +GDBProcess *gdb_get_process(uint32_t pid) { int i; @@ -247,7 +250,7 @@ static CPUState *find_cpu(uint32_t thread_id) return NULL; } -static CPUState *get_first_cpu_in_process(GDBProcess *process) +CPUState *gdb_get_first_cpu_in_process(GDBProcess *process) { CPUState *cpu; @@ -325,7 +328,7 @@ static CPUState *gdb_get_cpu(uint32_t pid, uint32_t tid) return NULL; } - return get_first_cpu_in_process(process); + return gdb_get_first_cpu_in_process(process); } else { /* a specific thread */ cpu = find_cpu(tid); @@ -354,7 +357,7 @@ static const char *get_feature_xml(const char *p, const char **newp, size_t len; int i; const char *name; - CPUState *cpu = get_first_cpu_in_process(process); + CPUState *cpu = gdb_get_first_cpu_in_process(process); CPUClass *cc = CPU_GET_CLASS(cpu); len = 0; @@ -490,7 +493,7 @@ void gdb_register_coprocessor(CPUState *cpu, static void gdb_process_breakpoint_remove_all(GDBProcess *p) { - CPUState *cpu = get_first_cpu_in_process(p); + CPUState *cpu = gdb_get_first_cpu_in_process(p); while (cpu) { gdb_breakpoint_remove_all(cpu); @@ -573,7 +576,6 @@ static int gdb_handle_vcont(const char *p) { int res, signal = 0; char cur_action; - char *newstates; unsigned long tmp; uint32_t pid, tid; GDBProcess *process; @@ -581,7 +583,7 @@ static int gdb_handle_vcont(const char *p) GDBThreadIdKind kind; unsigned int max_cpus = gdb_get_max_cpus(); /* uninitialised CPUs stay 0 */ - newstates = g_new0(char, max_cpus); + g_autofree char *newstates = g_new0(char, max_cpus); /* mark valid CPUs with 1 */ CPU_FOREACH(cpu) { @@ -597,8 +599,7 @@ static int gdb_handle_vcont(const char *p) res = 0; while (*p) { if (*p++ != ';') { - res = -ENOTSUP; - goto out; + return -ENOTSUP; } cur_action = *p++; @@ -606,13 +607,12 @@ static int gdb_handle_vcont(const char *p) cur_action = qemu_tolower(cur_action); res = qemu_strtoul(p, &p, 16, &tmp); if (res) { - goto out; + return res; } signal = gdb_signal_to_target(tmp); } else if (cur_action != 'c' && cur_action != 's') { /* unknown/invalid/unsupported command */ - res = -ENOTSUP; - goto out; + return -ENOTSUP; } if (*p == '\0' || *p == ';') { @@ -625,14 +625,12 @@ static int gdb_handle_vcont(const char *p) } else if (*p++ == ':') { kind = read_thread_id(p, &p, &pid, &tid); } else { - res = -ENOTSUP; - goto out; + return -ENOTSUP; } switch (kind) { case GDB_READ_THREAD_ERR: - res = -EINVAL; - goto out; + return -EINVAL; case GDB_ALL_PROCESSES: cpu = gdb_first_attached_cpu(); @@ -649,11 +647,10 @@ static int gdb_handle_vcont(const char *p) process = gdb_get_process(pid); if (!process->attached) { - res = -EINVAL; - goto out; + return -EINVAL; } - cpu = get_first_cpu_in_process(process); + cpu = gdb_get_first_cpu_in_process(process); while (cpu) { if (newstates[cpu->cpu_index] == 1) { newstates[cpu->cpu_index] = cur_action; @@ -668,8 +665,7 @@ static int gdb_handle_vcont(const char *p) /* invalid CPU/thread specified */ if (!cpu) { - res = -EINVAL; - goto out; + return -EINVAL; } /* only use if no previous match occourred */ @@ -679,12 +675,9 @@ static int gdb_handle_vcont(const char *p) break; } } + gdbserver_state.signal = signal; gdb_continue_partial(newstates); - -out: - g_free(newstates); - return res; } @@ -1280,7 +1273,7 @@ static void handle_v_attach(GArray *params, void *user_ctx) goto cleanup; } - cpu = get_first_cpu_in_process(process); + cpu = gdb_get_first_cpu_in_process(process); if (!cpu) { goto cleanup; } @@ -1334,6 +1327,36 @@ static const GdbCmdParseEntry gdb_v_commands_table[] = { .cmd = "Kill;", .cmd_startswith = 1 }, +#ifdef CONFIG_USER_ONLY + /* + * Host I/O Packets. See [1] for details. + * [1] https://sourceware.org/gdb/onlinedocs/gdb/Host-I_002fO-Packets.html + */ + { + .handler = gdb_handle_v_file_open, + .cmd = "File:open:", + .cmd_startswith = 1, + .schema = "s,L,L0" + }, + { + .handler = gdb_handle_v_file_close, + .cmd = "File:close:", + .cmd_startswith = 1, + .schema = "l0" + }, + { + .handler = gdb_handle_v_file_pread, + .cmd = "File:pread:", + .cmd_startswith = 1, + .schema = "l,L,L0" + }, + { + .handler = gdb_handle_v_file_readlink, + .cmd = "File:readlink:", + .cmd_startswith = 1, + .schema = "s0" + }, +#endif }; static void handle_v_commands(GArray *params, void *user_ctx) @@ -1403,7 +1426,7 @@ static void handle_query_curr_tid(GArray *params, void *user_ctx) * first thread). */ process = gdb_get_cpu_process(gdbserver_state.g_cpu); - cpu = get_first_cpu_in_process(process); + cpu = gdb_get_first_cpu_in_process(process); g_string_assign(gdbserver_state.str_buf, "QC"); gdb_append_thread_id(cpu, gdbserver_state.str_buf); gdb_put_strbuf(); @@ -1479,11 +1502,14 @@ static void handle_query_supported(GArray *params, void *user_ctx) ";ReverseStep+;ReverseContinue+"); } -#if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX) +#if defined(CONFIG_USER_ONLY) +#if defined(CONFIG_LINUX) if (gdbserver_state.c_cpu->opaque) { g_string_append(gdbserver_state.str_buf, ";qXfer:auxv:read+"); } #endif + g_string_append(gdbserver_state.str_buf, ";qXfer:exec-file:read+"); +#endif if (params->len && strstr(get_param(params, 0)->data, "multiprocess+")) { @@ -1622,7 +1648,8 @@ static const GdbCmdParseEntry gdb_gen_query_table[] = { .cmd_startswith = 1, .schema = "s:l,l0" }, -#if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX) +#if defined(CONFIG_USER_ONLY) +#if defined(CONFIG_LINUX) { .handler = gdb_handle_query_xfer_auxv, .cmd = "Xfer:auxv:read::", @@ -1631,6 +1658,13 @@ static const GdbCmdParseEntry gdb_gen_query_table[] = { }, #endif { + .handler = gdb_handle_query_xfer_exec_file, + .cmd = "Xfer:exec-file:read:", + .cmd_startswith = 1, + .schema = "l:l,l0" + }, +#endif + { .handler = gdb_handle_query_attached, .cmd = "Attached:", .cmd_startswith = 1 @@ -1814,6 +1848,7 @@ static int gdb_handle_packet(const char *line_buf) .handler = handle_backward, .cmd = "b", .cmd_startswith = 1, + .allow_stop_reply = true, .schema = "o0" }; cmd_parser = &backward_cmd_desc; @@ -2146,19 +2181,25 @@ void gdb_read_byte(uint8_t ch) void gdb_create_default_process(GDBState *s) { GDBProcess *process; - int max_pid = 0; + int pid; +#ifdef CONFIG_USER_ONLY + assert(gdbserver_state.process_num == 0); + pid = getpid(); +#else if (gdbserver_state.process_num) { - max_pid = s->processes[s->process_num - 1].pid; + pid = s->processes[s->process_num - 1].pid; + } else { + pid = 0; } + /* We need an available PID slot for this process */ + assert(pid < UINT32_MAX); + pid++; +#endif s->processes = g_renew(GDBProcess, s->processes, ++s->process_num); process = &s->processes[s->process_num - 1]; - - /* We need an available PID slot for this process */ - assert(max_pid < UINT32_MAX); - - process->pid = max_pid + 1; + process->pid = pid; process->attached = false; process->target_xml[0] = '\0'; } diff --git a/gdbstub/internals.h b/gdbstub/internals.h index 33d21d6488..f2b46cce41 100644 --- a/gdbstub/internals.h +++ b/gdbstub/internals.h @@ -129,6 +129,8 @@ void gdb_read_byte(uint8_t ch); */ bool gdb_got_immediate_ack(void); /* utility helpers */ +GDBProcess *gdb_get_process(uint32_t pid); +CPUState *gdb_get_first_cpu_in_process(GDBProcess *process); CPUState *gdb_first_attached_cpu(void); void gdb_append_thread_id(CPUState *cpu, GString *buf); int gdb_get_cpu_index(CPUState *cpu); @@ -187,6 +189,11 @@ typedef union GdbCmdVariant { 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 */ +void gdb_handle_v_file_open(GArray *params, void *user_ctx); /* user */ +void gdb_handle_v_file_close(GArray *params, void *user_ctx); /* user */ +void gdb_handle_v_file_pread(GArray *params, void *user_ctx); /* user */ +void gdb_handle_v_file_readlink(GArray *params, void *user_ctx); /* user */ +void gdb_handle_query_xfer_exec_file(GArray *params, void *user_ctx); /* user */ void gdb_handle_query_attached(GArray *params, void *user_ctx); /* both */ diff --git a/gdbstub/softmmu.c b/gdbstub/softmmu.c index 99d994e6bf..f509b7285d 100644 --- a/gdbstub/softmmu.c +++ b/gdbstub/softmmu.c @@ -332,11 +332,9 @@ static void create_processes(GDBState *s) int gdbserver_start(const char *device) { - trace_gdbstub_op_start(device); - - char gdbstub_device_name[128]; Chardev *chr = NULL; Chardev *mon_chr; + g_autoptr(GString) cs = g_string_new(device); if (!first_cpu) { error_report("gdbstub: meaningless to attach gdb to a " @@ -350,15 +348,16 @@ int gdbserver_start(const char *device) return -1; } - if (!device) { + if (cs->len == 0) { return -1; } - if (strcmp(device, "none") != 0) { - if (strstart(device, "tcp:", NULL)) { + + trace_gdbstub_op_start(cs->str); + + if (g_strcmp0(cs->str, "none") != 0) { + if (g_str_has_prefix(cs->str, "tcp:")) { /* enforce required TCP attributes */ - snprintf(gdbstub_device_name, sizeof(gdbstub_device_name), - "%s,wait=off,nodelay=on,server=on", device); - device = gdbstub_device_name; + g_string_append_printf(cs, ",wait=off,nodelay=on,server=on"); } #ifndef _WIN32 else if (strcmp(device, "stdio") == 0) { @@ -373,7 +372,7 @@ int gdbserver_start(const char *device) * FIXME: it's a bit weird to allow using a mux chardev here * and implicitly setup a monitor. We may want to break this. */ - chr = qemu_chr_new_noreplay("gdb", device, true, NULL); + chr = qemu_chr_new_noreplay("gdb", cs->str, true, NULL); if (!chr) { return -1; } diff --git a/gdbstub/user-target.c b/gdbstub/user-target.c index fa0e59ec9a..6e21c3161c 100644 --- a/gdbstub/user-target.c +++ b/gdbstub/user-target.c @@ -11,6 +11,10 @@ #include "exec/gdbstub.h" #include "qemu.h" #include "internals.h" +#ifdef CONFIG_LINUX +#include "linux-user/loader.h" +#include "linux-user/qemu.h" +#endif /* * Map target signal numbers to GDB protocol signal numbers and vice @@ -281,3 +285,136 @@ void gdb_handle_query_xfer_auxv(GArray *params, void *user_ctx) gdbserver_state.str_buf->len, true); } #endif + +static const char *get_filename_param(GArray *params, int i) +{ + const char *hex_filename = get_param(params, i)->data; + gdb_hextomem(gdbserver_state.mem_buf, hex_filename, + strlen(hex_filename) / 2); + g_byte_array_append(gdbserver_state.mem_buf, (const guint8 *)"", 1); + return (const char *)gdbserver_state.mem_buf->data; +} + +static void hostio_reply_with_data(const void *buf, size_t n) +{ + g_string_printf(gdbserver_state.str_buf, "F%zx;", n); + gdb_memtox(gdbserver_state.str_buf, buf, n); + gdb_put_packet_binary(gdbserver_state.str_buf->str, + gdbserver_state.str_buf->len, true); +} + +void gdb_handle_v_file_open(GArray *params, void *user_ctx) +{ + const char *filename = get_filename_param(params, 0); + uint64_t flags = get_param(params, 1)->val_ull; + uint64_t mode = get_param(params, 2)->val_ull; + +#ifdef CONFIG_LINUX + int fd = do_guest_openat(gdbserver_state.g_cpu->env_ptr, 0, filename, + flags, mode, false); +#else + int fd = open(filename, flags, mode); +#endif + if (fd < 0) { + g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno); + } else { + g_string_printf(gdbserver_state.str_buf, "F%d", fd); + } + gdb_put_strbuf(); +} + +void gdb_handle_v_file_close(GArray *params, void *user_ctx) +{ + int fd = get_param(params, 0)->val_ul; + + if (close(fd) == -1) { + g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno); + gdb_put_strbuf(); + return; + } + + gdb_put_packet("F00"); +} + +void gdb_handle_v_file_pread(GArray *params, void *user_ctx) +{ + int fd = get_param(params, 0)->val_ul; + size_t count = get_param(params, 1)->val_ull; + off_t offset = get_param(params, 2)->val_ull; + + size_t bufsiz = MIN(count, BUFSIZ); + g_autofree char *buf = g_try_malloc(bufsiz); + if (buf == NULL) { + gdb_put_packet("E12"); + return; + } + + ssize_t n = pread(fd, buf, bufsiz, offset); + if (n < 0) { + g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno); + gdb_put_strbuf(); + return; + } + hostio_reply_with_data(buf, n); +} + +void gdb_handle_v_file_readlink(GArray *params, void *user_ctx) +{ + const char *filename = get_filename_param(params, 0); + + g_autofree char *buf = g_try_malloc(BUFSIZ); + if (buf == NULL) { + gdb_put_packet("E12"); + return; + } + +#ifdef CONFIG_LINUX + ssize_t n = do_guest_readlink(filename, buf, BUFSIZ); +#else + ssize_t n = readlink(filename, buf, BUFSIZ); +#endif + if (n < 0) { + g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno); + gdb_put_strbuf(); + return; + } + hostio_reply_with_data(buf, n); +} + +void gdb_handle_query_xfer_exec_file(GArray *params, void *user_ctx) +{ + uint32_t pid = get_param(params, 0)->val_ul; + uint32_t offset = get_param(params, 1)->val_ul; + uint32_t length = get_param(params, 2)->val_ul; + + GDBProcess *process = gdb_get_process(pid); + if (!process) { + gdb_put_packet("E00"); + return; + } + + CPUState *cpu = gdb_get_first_cpu_in_process(process); + if (!cpu) { + gdb_put_packet("E00"); + return; + } + + TaskState *ts = cpu->opaque; + if (!ts || !ts->bprm || !ts->bprm->filename) { + gdb_put_packet("E00"); + return; + } + + size_t total_length = strlen(ts->bprm->filename); + if (offset > total_length) { + gdb_put_packet("E00"); + return; + } + if (offset + length > total_length) { + length = total_length - offset; + } + + g_string_printf(gdbserver_state.str_buf, "l%.*s", length, + ts->bprm->filename + offset); + gdb_put_strbuf(); +} |