In the context of using the remote gdb with multiple
processes/inferiors (multiple cluster machine) a given breakpoint
will target an specific inferior. If needed the remote protocol will
use the packet 'H op thread-id' with op = 'g' to change focus to the
inferior we want to insert/remove the breakpoint to, for instance
'Hgp3.3' and not 'Hcp3.3'.
This is supported by the documentation of the H packets:
> 'H op thread-id'
> Set thread for subsequent operations ('m', 'M', 'g', 'G',
> et.al.). Depending on the operation to be performed, op should be
> 'c' for step and continue operations (note that this is
> deprecated, supporting the 'vCont' command is a better option),
> and 'g' for other operations.
This can also be verified in the GDB source code file gdb/remote.c.
Functions remote_target::insert_breakpoint and
remote_target::remove_breakpoint will eventually call
remote_target::set_general_thread if it needs to change the process
focus and not remote_target::set_continue_thread.
This can be seen around a comment that says:
/* Make sure the remote is pointing at the right process, if
necessary. */
Google-Bug-Id: 355027002
Signed-off-by: Roque Arcudia Hernandez <roq...@google.com>
---
gdbstub/gdbstub.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c
index d08568cea0..98574eba68 100644
--- a/gdbstub/gdbstub.c
+++ b/gdbstub/gdbstub.c
@@ -1148,7 +1148,7 @@ static void handle_insert_bp(GArray *params, void
*user_ctx)
return;
}
- res = gdb_breakpoint_insert(gdbserver_state.c_cpu,
+ res = gdb_breakpoint_insert(gdbserver_state.g_cpu,
gdb_get_cmd_param(params, 0)->val_ul,
gdb_get_cmd_param(params, 1)->val_ull,
gdb_get_cmd_param(params, 2)->val_ull);
@@ -1172,7 +1172,7 @@ static void handle_remove_bp(GArray *params, void
*user_ctx)
return;
}
- res = gdb_breakpoint_remove(gdbserver_state.c_cpu,
+ res = gdb_breakpoint_remove(gdbserver_state.g_cpu,
gdb_get_cmd_param(params, 0)->val_ul,
gdb_get_cmd_param(params, 1)->val_ull,
gdb_get_cmd_param(params, 2)->val_ull);
--
2.46.0.469.g59c65b2a67-goog
