diff options
| -rw-r--r-- | gdbstub/gdbstub.c | 45 | ||||
| -rw-r--r-- | gdbstub/internals.h | 5 | ||||
| -rw-r--r-- | gdbstub/user-target.c | 137 |
3 files changed, 185 insertions, 2 deletions
diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c index 697dd4b..6911b73 100644 --- a/gdbstub/gdbstub.c +++ b/gdbstub/gdbstub.c @@ -1327,6 +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) @@ -1472,11 +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+")) { @@ -1615,7 +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::", @@ -1624,6 +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 diff --git a/gdbstub/internals.h b/gdbstub/internals.h index 25e4d5e..f2b46cc 100644 --- a/gdbstub/internals.h +++ b/gdbstub/internals.h @@ -189,6 +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/user-target.c b/gdbstub/user-target.c index fa0e59e..6e21c31 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(); +} |