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GDB monitor: find out page faulting thread

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Fixes #898.
This commit is contained in:
Christian Prochaska
2013-10-24 16:05:31 +02:00
committed by Christian Helmuth
parent 5774a864b1
commit cc04ffcf42
10 changed files with 68 additions and 13 deletions
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17
ports/src/app/gdb_monitor/gdbserver/genode-low.cc
View File

@@ -181,6 +181,23 @@ void genode_continue_thread(unsigned long lwpid, int single_step)
}
unsigned long genode_find_segfault_lwpid()
{
Cpu_session_component *csc = gdb_stub_thread()->cpu_session_component();
Thread_capability thread_cap = csc->first();
while (thread_cap.valid()) {
Thread_state thread_state = csc->state(thread_cap);
if (thread_state.unresolved_page_fault)
return csc->lwpid(thread_cap);
thread_cap = csc->next(thread_cap);
}
PDBG("could not determine thread which caused the page fault");
return 1;
}
class Memory_model
{

2
ports/src/app/gdb_monitor/gdbserver/genode-low.h
View File

@@ -31,6 +31,8 @@ void genode_resume_all_threads();
ptid_t genode_wait_for_signal_or_gdb_interrupt(struct target_waitstatus *status);
void genode_continue_thread(unsigned long lwpid, int single_step);
unsigned long genode_find_segfault_lwpid();
int genode_fetch_register(int regno, unsigned long *reg_content);
void genode_store_register(int regno, unsigned long reg_content);
unsigned char genode_read_memory_byte(void *addr);

6
ports/src/app/gdb_monitor/gdbserver_genode.patch
View File

@@ -651,7 +651,7 @@ index 69c6b57..cffa803 100644
x86_supports_tracepoints,
x86_get_thread_area,
diff --git a/gdb/gdbserver/remote-utils.c b/gdb/gdbserver/remote-utils.c
index 650ddf8..046dd2e 100644
index 650ddf8..728da30 100644
--- a/gdb/gdbserver/remote-utils.c
+++ b/gdb/gdbserver/remote-utils.c
@@ -18,11 +18,14 @@
@@ -756,11 +756,11 @@ index 650ddf8..046dd2e 100644
+ genode_stop_all_threads();
+
+ if (sig > 0) {
+ event_ptid.lwp = sig;
+ event_ptid.lwp = sig;
+ status->kind = TARGET_WAITKIND_STOPPED;
+ status->value.sig = TARGET_SIGNAL_TRAP;
+ } else {
+ event_ptid.lwp = 1;
+ event_ptid.lwp = genode_find_segfault_lwpid();
+ status->kind = TARGET_WAITKIND_STOPPED;
+ status->value.sig = TARGET_SIGNAL_SEGV;
+ }