diff options
author | Gustavo Romero <gustavo.romero@linaro.org> | 2024-07-05 09:40:39 +0100 |
---|---|---|
committer | Alex Bennée <alex.bennee@linaro.org> | 2024-07-05 12:35:05 +0100 |
commit | 60f4ce8e2cb9afebc7f3e40062087b91b7243c36 (patch) | |
tree | ac115a0a700f1829dcf0834798be65ddd42753d3 /gdbstub | |
parent | 133f202b19d8332de8d433c627fe6354e2ecf889 (diff) |
gdbstub: Add support for target-specific stubs
Currently, it's not possible to have stubs specific to a given target,
even though there are GDB features which are target-specific, like, for
instance, memory tagging.
This commit introduces gdb_extend_qsupported_features,
gdb_extend_query_table, and gdb_extend_set_table functions as interfaces
to extend the qSupported string, the query handler table, and the set
handler table, allowing target-specific stub implementations.
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240628050850.536447-4-gustavo.romero@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240705084047.857176-33-alex.bennee@linaro.org>
Diffstat (limited to 'gdbstub')
-rw-r--r-- | gdbstub/gdbstub.c | 102 |
1 files changed, 96 insertions, 6 deletions
diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c index 9ff2f4177d..b1ca253f97 100644 --- a/gdbstub/gdbstub.c +++ b/gdbstub/gdbstub.c @@ -1609,6 +1609,20 @@ static void handle_query_thread_extra(GArray *params, void *user_ctx) gdb_put_strbuf(); } +static char *extended_qsupported_features; +void gdb_extend_qsupported_features(char *qsupported_features) +{ + /* + * We don't support different sets of CPU gdb features on different CPUs yet + * so assert the feature strings are the same on all CPUs, or is set only + * once (1 CPU). + */ + g_assert(extended_qsupported_features == NULL || + g_strcmp0(extended_qsupported_features, qsupported_features) == 0); + + extended_qsupported_features = qsupported_features; +} + static void handle_query_supported(GArray *params, void *user_ctx) { CPUClass *cc; @@ -1648,6 +1662,11 @@ static void handle_query_supported(GArray *params, void *user_ctx) } g_string_append(gdbserver_state.str_buf, ";vContSupported+;multiprocess+"); + + if (extended_qsupported_features) { + g_string_append(gdbserver_state.str_buf, extended_qsupported_features); + } + gdb_put_strbuf(); } @@ -1729,6 +1748,41 @@ static const GdbCmdParseEntry gdb_gen_query_set_common_table[] = { }, }; +/* Compares if a set of command parsers is equal to another set of parsers. */ +static bool cmp_cmds(GdbCmdParseEntry *c, GdbCmdParseEntry *d, int size) +{ + for (int i = 0; i < size; i++) { + if (!(c[i].handler == d[i].handler && + g_strcmp0(c[i].cmd, d[i].cmd) == 0 && + c[i].cmd_startswith == d[i].cmd_startswith && + g_strcmp0(c[i].schema, d[i].schema) == 0)) { + + /* Sets are different. */ + return false; + } + } + + /* Sets are equal, i.e. contain the same command parsers. */ + return true; +} + +static GdbCmdParseEntry *extended_query_table; +static int extended_query_table_size; +void gdb_extend_query_table(GdbCmdParseEntry *table, int size) +{ + /* + * We don't support different sets of CPU gdb features on different CPUs yet + * so assert query table is the same on all CPUs, or is set only once + * (1 CPU). + */ + g_assert(extended_query_table == NULL || + (extended_query_table_size == size && + cmp_cmds(extended_query_table, table, size))); + + extended_query_table = table; + extended_query_table_size = size; +} + static const GdbCmdParseEntry gdb_gen_query_table[] = { { .handler = handle_query_curr_tid, @@ -1821,6 +1875,22 @@ static const GdbCmdParseEntry gdb_gen_query_table[] = { #endif }; +static GdbCmdParseEntry *extended_set_table; +static int extended_set_table_size; +void gdb_extend_set_table(GdbCmdParseEntry *table, int size) +{ + /* + * We don't support different sets of CPU gdb features on different CPUs yet + * so assert set table is the same on all CPUs, or is set only once (1 CPU). + */ + g_assert(extended_set_table == NULL || + (extended_set_table_size == size && + cmp_cmds(extended_set_table, table, size))); + + extended_set_table = table; + extended_set_table_size = size; +} + static const GdbCmdParseEntry gdb_gen_set_table[] = { /* Order is important if has same prefix */ { @@ -1859,11 +1929,21 @@ static void handle_gen_query(GArray *params, void *user_ctx) return; } - if (!process_string_cmd(gdb_get_cmd_param(params, 0)->data, - gdb_gen_query_table, - ARRAY_SIZE(gdb_gen_query_table))) { - gdb_put_packet(""); + if (process_string_cmd(gdb_get_cmd_param(params, 0)->data, + gdb_gen_query_table, + ARRAY_SIZE(gdb_gen_query_table))) { + return; + } + + if (extended_query_table && + process_string_cmd(gdb_get_cmd_param(params, 0)->data, + extended_query_table, + extended_query_table_size)) { + return; } + + /* Can't handle query, return Empty response. */ + gdb_put_packet(""); } static void handle_gen_set(GArray *params, void *user_ctx) @@ -1878,11 +1958,21 @@ static void handle_gen_set(GArray *params, void *user_ctx) return; } - if (!process_string_cmd(gdb_get_cmd_param(params, 0)->data, + if (process_string_cmd(gdb_get_cmd_param(params, 0)->data, gdb_gen_set_table, ARRAY_SIZE(gdb_gen_set_table))) { - gdb_put_packet(""); + return; } + + if (extended_set_table && + process_string_cmd(gdb_get_cmd_param(params, 0)->data, + extended_set_table, + extended_set_table_size)) { + return; + } + + /* Can't handle set, return Empty response. */ + gdb_put_packet(""); } static void handle_target_halt(GArray *params, void *user_ctx) |