[PATCH v2][CRISv32] Add support for threaded debugging

[Ricard Wanderlof]

On Tue, 3 Sep 2013, Pedro Alves wrote:

> On 09/03/2013 03:18 PM, Ricard Wanderlof wrote:
>
>>
>> 2013-09-03  Ricard Wanderlof  <ricardw@axis.com>
>>
>>   	* cris-tdep.c:
>>   	(cris_gdbarch_init): Add call to
>>   	get_gdbarch_fetch_tls_load_module_address.
>
> Spurious ':' / wrong formatting:
>
>   	* cris-tdep.c (cris_gdbarch_init): Add call to
>   	get_gdbarch_fetch_tls_load_module_address.
>
>>
>> gdbserver
>>
>>   	* linux-crisv32-low.c: PTRACE_GET_THREAD_AREA: New macro.
>>   	(ps_get_thread_area): New function.
>
> Wrong formatting:
>
>   	* linux-crisv32-low.c (PTRACE_GET_THREAD_AREA): New macro.
>   	(ps_get_thread_area): New function.
>
> OK with those changes.

Committed now.

/Ricard


Add support for threaded debugging for CRISv32.

2013-09-06  Ricard Wanderlof  <ricardw@axis.com>

 	* cris-tdep.c (cris_gdbarch_init): Add call to
 	get_gdbarch_fetch_tls_load_module_address.

gdbserver

 	* linux-crisv32-low.c (PTRACE_GET_THREAD_AREA): New macro.
 	(ps_get_thread_area): New function.


diff --git a/gdb/cris-tdep.c b/gdb/cris-tdep.c
index 1b0e3cd..ef2746d 100644
--- a/gdb/cris-tdep.c
+++ b/gdb/cris-tdep.c
@@ -4137,6 +4137,11 @@ cris_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
        set_gdbarch_single_step_through_delay
  	(gdbarch, crisv32_single_step_through_delay);

+      /* FIXME: Ricard W/2013-09-03: Linux-specific stuff like this
+         should really go in (a new) cris-linux-tdep.c. */
+      set_gdbarch_fetch_tls_load_module_address (gdbarch,
+                                                 svr4_fetch_objfile_link_map);
+
        break;

      default:
diff --git a/gdb/gdbserver/linux-crisv32-low.c b/gdb/gdbserver/linux-crisv32-low.c
index 2849d02..84cb7ff 100644
--- a/gdb/gdbserver/linux-crisv32-low.c
+++ b/gdb/gdbserver/linux-crisv32-low.c
@@ -27,6 +27,10 @@ extern const struct target_desc *tdesc_crisv32;
  /* CRISv32 */
  #define cris_num_regs 49

+#ifndef PTRACE_GET_THREAD_AREA
+#define PTRACE_GET_THREAD_AREA 25
+#endif
+
  /* Note: Ignoring USP (having the stack pointer in two locations causes trouble
     without any significant gain).  */

@@ -339,6 +343,20 @@ cris_stopped_data_address (void)
    return eda;
  }

+ps_err_e
+ps_get_thread_area (const struct ps_prochandle *ph,
+                    lwpid_t lwpid, int idx, void **base)
+{
+  if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
+    return PS_ERR;
+
+  /* IDX is the bias from the thread pointer to the beginning of the
+     thread descriptor.  It has to be subtracted due to implementation
+     quirks in libthread_db.  */
+  *base = (void *) ((char *) *base - idx);
+  return PS_OK;
+}
+
  static void
  cris_fill_gregset (struct regcache *regcache, void *buf)
  {


-- 
Ricard Wolf Wanderlöf                           ricardw(at)axis.com
Axis Communications AB, Lund, Sweden            www.axis.com
Phone +46 46 272 2016                           Fax +46 46 13 61 30