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gdbstub: Add Xfer:siginfo:read stub

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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>
This commit is contained in:
Gustavo Romero 2024-03-09 03:09:00 +00:00 committed by Alex Bennée
parent f84e313e02
commit 9ae5801d35
3 changed files with 32 additions and 0 deletions
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8
gdbstub/gdbstub.c
View file

@ -1664,6 +1664,8 @@ static void handle_query_supported(GArray *params, void *user_ctx)
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
@ -1818,6 +1820,12 @@ static const GdbCmdParseEntry gdb_gen_query_table[] = {
.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,

1
gdbstub/internals.h
View file

@ -190,6 +190,7 @@ 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_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 */

23
gdbstub/user.c
View file

@ -852,3 +852,26 @@ void gdb_handle_set_catch_syscalls(GArray *params, void *user_ctx)
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);
}