unsigned int dr_ref_count_wp[AARCH64_HWP_MAX_NUM];
};
-/* Clear the reference counts and forget everything we knew about the
- debug registers. */
+/* Per-process data. We don't bind this to a per-inferior registry
+ because of targets like x86 GNU/Linux that need to keep track of
+ processes that aren't bound to any inferior (e.g., fork children,
+ checkpoints). */
-static void
-aarch64_init_debug_reg_state (struct aarch64_debug_reg_state *state)
+struct aarch64_process_info
{
- int i;
+ /* Linked list. */
+ struct aarch64_process_info *next;
- for (i = 0; i < AARCH64_HBP_MAX_NUM; ++i)
- {
- state->dr_addr_bp[i] = 0;
- state->dr_ctrl_bp[i] = 0;
- state->dr_ref_count_bp[i] = 0;
- }
+ /* The process identifier. */
+ pid_t pid;
- for (i = 0; i < AARCH64_HWP_MAX_NUM; ++i)
- {
- state->dr_addr_wp[i] = 0;
- state->dr_ctrl_wp[i] = 0;
- state->dr_ref_count_wp[i] = 0;
- }
+ /* Copy of aarch64 hardware debug registers. */
+ struct aarch64_debug_reg_state state;
+};
+
+static struct aarch64_process_info *aarch64_process_list = NULL;
+
+/* Find process data for process PID. */
+
+static struct aarch64_process_info *
+aarch64_find_process_pid (pid_t pid)
+{
+ struct aarch64_process_info *proc;
+
+ for (proc = aarch64_process_list; proc; proc = proc->next)
+ if (proc->pid == pid)
+ return proc;
+
+ return NULL;
}
-/* Per-inferior data key. */
-static const struct inferior_data *aarch64_inferior_data;
+/* Add process data for process PID. Returns newly allocated info
+ object. */
-/* Per-inferior data. */
-struct aarch64_inferior_data
+static struct aarch64_process_info *
+aarch64_add_process (pid_t pid)
{
- /* Copy of AArch64 hardware debug registers for performance reasons. */
- struct aarch64_debug_reg_state state;
-};
+ struct aarch64_process_info *proc;
-/* Per-inferior hook for register_inferior_data_with_cleanup. */
+ proc = xcalloc (1, sizeof (*proc));
+ proc->pid = pid;
-static void
-aarch64_inferior_data_cleanup (struct inferior *inf, void *arg)
+ proc->next = aarch64_process_list;
+ aarch64_process_list = proc;
+
+ return proc;
+}
+
+/* Get data specific info for process PID, creating it if necessary.
+ Never returns NULL. */
+
+static struct aarch64_process_info *
+aarch64_process_info_get (pid_t pid)
{
- struct aarch64_inferior_data *inf_data = arg;
+ struct aarch64_process_info *proc;
+
+ proc = aarch64_find_process_pid (pid);
+ if (proc == NULL)
+ proc = aarch64_add_process (pid);
- xfree (inf_data);
+ return proc;
}
-/* Get data specific for INFERIOR_PTID LWP. Return special data area
- for processes being detached. */
+/* Called whenever GDB is no longer debugging process PID. It deletes
+ data structures that keep track of debug register state. */
-static struct aarch64_inferior_data *
-aarch64_inferior_data_get (void)
+static void
+aarch64_forget_process (pid_t pid)
{
- struct inferior *inf = current_inferior ();
- struct aarch64_inferior_data *inf_data;
+ struct aarch64_process_info *proc, **proc_link;
- inf_data = inferior_data (inf, aarch64_inferior_data);
- if (inf_data == NULL)
+ proc = aarch64_process_list;
+ proc_link = &aarch64_process_list;
+
+ while (proc != NULL)
{
- inf_data = xzalloc (sizeof (*inf_data));
- set_inferior_data (inf, aarch64_inferior_data, inf_data);
- }
+ if (proc->pid == pid)
+ {
+ *proc_link = proc->next;
- return inf_data;
+ xfree (proc);
+ return;
+ }
+
+ proc_link = &proc->next;
+ proc = *proc_link;
+ }
}
-/* Get debug registers state for INFERIOR_PTID, see
- aarch64_inferior_data_get. */
+/* Get debug registers state for process PID. */
static struct aarch64_debug_reg_state *
-aarch64_get_debug_reg_state (void)
+aarch64_get_debug_reg_state (pid_t pid)
{
- return &aarch64_inferior_data_get ()->state;
+ return &aarch64_process_info_get (pid)->state;
}
/* Per-thread arch-specific data we want to keep. */
unsigned int idx;
};
-/* Callback for linux_nat_iterate_watchpoint_lwps. Records the
+/* Callback for iterate_over_lwps. Records the
information about the change of one hardware breakpoint/watchpoint
setting for the thread LWP.
The information is passed in via PTR.
int is_watchpoint, unsigned int idx)
{
struct aarch64_dr_update_callback_param param;
+ ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid));
param.is_watchpoint = is_watchpoint;
param.idx = idx;
- linux_nat_iterate_watchpoint_lwps (debug_reg_change_callback,
- (void *) ¶m);
+ iterate_over_lwps (pid_ptid, debug_reg_change_callback, (void *) ¶m);
}
/* Print the values of the cached breakpoint/watchpoint registers. */
|| DR_HAS_CHANGED (info->dr_changed_wp))
{
int tid = GET_LWP (lwp->ptid);
- struct aarch64_debug_reg_state *state = aarch64_get_debug_reg_state ();
+ struct aarch64_debug_reg_state *state
+ = aarch64_get_debug_reg_state (ptid_get_pid (lwp->ptid));
if (debug_hw_points)
fprintf_unfiltered (gdb_stdlog, "prepare_to_resume thread %d\n", tid);
lp->arch_private = info;
}
+
+/* linux_nat_new_fork hook. */
+
+static void
+aarch64_linux_new_fork (struct lwp_info *parent, pid_t child_pid)
+{
+ pid_t parent_pid;
+ struct aarch64_debug_reg_state *parent_state;
+ struct aarch64_debug_reg_state *child_state;
+
+ /* NULL means no watchpoint has ever been set in the parent. In
+ that case, there's nothing to do. */
+ if (parent->arch_private == NULL)
+ return;
+
+ /* GDB core assumes the child inherits the watchpoints/hw
+ breakpoints of the parent, and will remove them all from the
+ forked off process. Copy the debug registers mirrors into the
+ new process so that all breakpoints and watchpoints can be
+ removed together. */
+
+ parent_pid = ptid_get_pid (parent->ptid);
+ parent_state = aarch64_get_debug_reg_state (parent_pid);
+ child_state = aarch64_get_debug_reg_state (child_pid);
+ *child_state = *parent_state;
+}
\f
/* Called by libthread_db. Returns a pointer to the thread local
static void
aarch64_linux_child_post_startup_inferior (ptid_t ptid)
{
- struct aarch64_debug_reg_state *state = aarch64_get_debug_reg_state ();
-
- aarch64_init_debug_reg_state (state);
+ aarch64_forget_process (ptid_get_pid (ptid));
aarch64_linux_get_debug_reg_capacity ();
super_post_startup_inferior (ptid);
}
if (!aarch64_point_is_aligned (0 /* is_watchpoint */ , addr, len))
return -1;
- state = aarch64_get_debug_reg_state ();
+ state = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid));
if (is_insert)
return aarch64_dr_state_insert_one_point (state, type, addr, len);
ret = aarch64_handle_breakpoint (type, addr, len, 1 /* is_insert */);
if (debug_hw_points > 1)
- aarch64_show_debug_reg_state (aarch64_get_debug_reg_state (),
- "insert_hw_watchpoint", addr, len, type);
+ {
+ struct aarch64_debug_reg_state *state
+ = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+ aarch64_show_debug_reg_state (state,
+ "insert_hw_watchpoint", addr, len, type);
+ }
return ret;
}
ret = aarch64_handle_breakpoint (type, addr, len, 0 /* is_insert */);
if (debug_hw_points > 1)
- aarch64_show_debug_reg_state (aarch64_get_debug_reg_state (),
- "remove_hw_watchpoint", addr, len, type);
+ {
+ struct aarch64_debug_reg_state *state
+ = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+ aarch64_show_debug_reg_state (state,
+ "remove_hw_watchpoint", addr, len, type);
+ }
return ret;
}
aarch64_handle_aligned_watchpoint (int type, CORE_ADDR addr, int len,
int is_insert)
{
- struct aarch64_debug_reg_state *state = aarch64_get_debug_reg_state ();
+ struct aarch64_debug_reg_state *state
+ = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid));
if (is_insert)
return aarch64_dr_state_insert_one_point (state, type, addr, len);
aarch64_handle_unaligned_watchpoint (int type, CORE_ADDR addr, int len,
int is_insert)
{
- struct aarch64_debug_reg_state *state = aarch64_get_debug_reg_state ();
+ struct aarch64_debug_reg_state *state
+ = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid));
while (len > 0)
{
ret = aarch64_handle_watchpoint (type, addr, len, 1 /* is_insert */);
if (debug_hw_points > 1)
- aarch64_show_debug_reg_state (aarch64_get_debug_reg_state (),
- "insert_watchpoint", addr, len, type);
+ {
+ struct aarch64_debug_reg_state *state
+ = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+ aarch64_show_debug_reg_state (state,
+ "insert_watchpoint", addr, len, type);
+ }
return ret;
}
ret = aarch64_handle_watchpoint (type, addr, len, 0 /* is_insert */);
if (debug_hw_points > 1)
- aarch64_show_debug_reg_state (aarch64_get_debug_reg_state (),
- "remove_watchpoint", addr, len, type);
+ {
+ struct aarch64_debug_reg_state *state
+ = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+ aarch64_show_debug_reg_state (state,
+ "remove_watchpoint", addr, len, type);
+ }
return ret;
}
return 0;
/* Check if the address matches any watched address. */
- state = aarch64_get_debug_reg_state ();
+ state = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid));
for (i = aarch64_num_wp_regs - 1; i >= 0; --i)
{
const unsigned int len = aarch64_watchpoint_length (state->dr_ctrl_wp[i]);
t->to_stopped_data_address = aarch64_linux_stopped_data_address;
t->to_watchpoint_addr_within_range =
aarch64_linux_watchpoint_addr_within_range;
- if (aarch64_inferior_data == NULL)
- aarch64_inferior_data
- = register_inferior_data_with_cleanup (NULL,
- aarch64_inferior_data_cleanup);
/* Override the GNU/Linux inferior startup hook. */
super_post_startup_inferior = t->to_post_startup_inferior;
/* Register the target. */
linux_nat_add_target (t);
linux_nat_set_new_thread (t, aarch64_linux_new_thread);
+ linux_nat_set_new_fork (t, aarch64_linux_new_fork);
+ linux_nat_set_forget_process (t, aarch64_forget_process);
linux_nat_set_prepare_to_resume (t, aarch64_linux_prepare_to_resume);
}
projects / binutils-gdb.git / commitdiff