Add stub to handle Xfer:siginfo:read packet query that requests the
machine's siginfo data.
This is used when GDB user executes 'print $_siginfo' and when the
machine stops due to a signal, for instance, on SIGSEGV. The information
in siginfo allows GDB to determiner further details on the signal, like
the fault address/insn when the SIGSEGV is caught.
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Message-Id: <
20240309030901.
1726211-5-gustavo.romero@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
g_string_append(gdbserver_state.str_buf, ";qXfer:auxv:read+");
}
g_string_append(gdbserver_state.str_buf, ";QCatchSyscalls+");
+
+ g_string_append(gdbserver_state.str_buf, ";qXfer:siginfo:read+");
#endif
g_string_append(gdbserver_state.str_buf, ";qXfer:exec-file:read+");
#endif
.cmd_startswith = 1,
.schema = "l,l0"
},
+ {
+ .handler = gdb_handle_query_xfer_siginfo,
+ .cmd = "Xfer:siginfo:read::",
+ .cmd_startswith = 1,
+ .schema = "l,l0"
+ },
#endif
{
.handler = gdb_handle_query_xfer_exec_file,
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_query_xfer_siginfo(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 */
err:
gdb_put_packet("E00");
}
+
+void gdb_handle_query_xfer_siginfo(GArray *params, void *user_ctx)
+{
+ unsigned long offset, len;
+ uint8_t *siginfo_offset;
+
+ offset = get_param(params, 0)->val_ul;
+ len = get_param(params, 1)->val_ul;
+
+ if (offset + len > gdbserver_user_state.siginfo_len) {
+ /* Invalid offset and/or requested length. */
+ gdb_put_packet("E01");
+ return;
+ }
+
+ siginfo_offset = (uint8_t *)gdbserver_user_state.siginfo + offset;
+
+ /* Reply */
+ g_string_assign(gdbserver_state.str_buf, "l");
+ gdb_memtox(gdbserver_state.str_buf, (const char *)siginfo_offset, len);
+ gdb_put_packet_binary(gdbserver_state.str_buf->str,
+ gdbserver_state.str_buf->len, true);
+}