PR 2343 fix: signal number mismatch

[Aleksandar Ristovski <ARistovski@qnx.com>]

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Hello,

This patch fixes PR 2343: when host and target system OS differ, there can
be mismatch between signal numeric values. This patch introduces new gdbarch
function to allow different targets define their own mapping to enum
target_signal.

ChangeLog:

2007-12-13  Aleksandar Ristovski <aristovski@qnx.com>

	* gdbarch.h: (gdbarch_target_signal_from_target_p): New function.
	(gdbarch_target_signal_from_target_ftype): New typedef.
	(gdbarch_target_signal_from_target): New function.
	(set_gdbarch_target_signal_from_target): New function.
	* gdbarch.c: (struct gdbarch): New field -
target_signal_from_target.
	(struct gdbarch startup_gdbarch): Initialization for the new field.
	(verify_gdbarch): Added comment, 'Skip verify...'.
	(gdbarch_dump): Printing debug info for the new field.
	(gdbarch_target_signal_from_target_p): New function definition.
	(gdbarch_target_signal_from_target_ftype): New typedef definition.
	(gdbarch_target_signal_from_target): New function definition.
	(set_gdbarch_target_signal_from_target): New function definition.
	* corelow.c: (core_open): Added logic for calling new function if
specified.


Thank you,

Aleksandar
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Index: gdb/gdbarch.h
===================================================================
RCS file: /cvs/src/src/gdb/gdbarch.h,v
retrieving revision 1.372
diff -u -3 -p -r1.372 gdbarch.h
--- gdb/gdbarch.h	6 Dec 2007 16:32:59 -0000	1.372
+++ gdb/gdbarch.h	13 Dec 2007 16:07:16 -0000
@@ -664,6 +664,16 @@ typedef const struct target_desc * (gdba
 extern const struct target_desc * gdbarch_core_read_description (struct gdbarch *gdbarch, struct target_ops *target, bfd *abfd);
 extern void set_gdbarch_core_read_description (struct gdbarch *gdbarch, gdbarch_core_read_description_ftype *core_read_description);
 
+/* Name rationale: 'target_signal' comes from 'enum target_signal',
+     'from_target' means from target as in inferior. */
+
+extern int gdbarch_target_signal_from_target_p (struct gdbarch *gdbarch);
+
+typedef enum target_signal (gdbarch_target_signal_from_target_ftype) (int signo);
+extern enum target_signal gdbarch_target_signal_from_target (struct gdbarch *gdbarch, int signo);
+extern void set_gdbarch_target_signal_from_target (struct gdbarch *gdbarch, gdbarch_target_signal_from_target_ftype *target_signal_from_target);
+
+
 /* Handle special encoding of static variables in stabs debug info. */
 
 extern int gdbarch_static_transform_name_p (struct gdbarch *gdbarch);
Index: gdb/gdbarch.c
===================================================================
RCS file: /cvs/src/src/gdb/gdbarch.c,v
retrieving revision 1.418
diff -u -3 -p -r1.418 gdbarch.c
--- gdb/gdbarch.c	6 Dec 2007 16:32:59 -0000	1.418
+++ gdb/gdbarch.c	13 Dec 2007 16:07:16 -0000
@@ -227,6 +227,7 @@ struct gdbarch
   gdbarch_skip_permanent_breakpoint_ftype *skip_permanent_breakpoint;
   gdbarch_overlay_update_ftype *overlay_update;
   gdbarch_core_read_description_ftype *core_read_description;
+  gdbarch_target_signal_from_target_ftype *target_signal_from_target;
   gdbarch_static_transform_name_ftype *static_transform_name;
   int sofun_address_maybe_missing;
 };
@@ -348,6 +349,7 @@ struct gdbarch startup_gdbarch =
   0,  /* skip_permanent_breakpoint */
   0,  /* overlay_update */
   0,  /* core_read_description */
+  0,  /* target_signal_from_target */
   0,  /* static_transform_name */
   0,  /* sofun_address_maybe_missing */
   /* startup_gdbarch() */
@@ -584,6 +586,7 @@ verify_gdbarch (struct gdbarch *gdbarch)
   /* Skip verify of skip_permanent_breakpoint, has predicate */
   /* Skip verify of overlay_update, has predicate */
   /* Skip verify of core_read_description, has predicate */
+  /* Skip verify of target_signal_from_target, has predicate */
   /* Skip verify of static_transform_name, has predicate */
   /* Skip verify of sofun_address_maybe_missing, invalid_p == 0 */
   buf = ui_file_xstrdup (log, &dummy);
@@ -687,6 +690,12 @@ gdbarch_dump (struct gdbarch *gdbarch, s
                       "gdbarch_dump: core_read_description = <0x%lx>\n",
                       (long) gdbarch->core_read_description);
   fprintf_unfiltered (file,
+                      "gdbarch_dump: gdbarch_target_signal_from_target_p() = %d\n",
+                      gdbarch_target_signal_from_target_p (gdbarch));
+  fprintf_unfiltered (file,
+                      "gdbarch_dump: target_signal_from_target = <0x%lx>\n",
+                      (long) gdbarch->target_signal_from_target);
+  fprintf_unfiltered (file,
                       "gdbarch_dump: gdbarch_core_xfer_shared_libraries_p() = %d\n",
                       gdbarch_core_xfer_shared_libraries_p (gdbarch));
   fprintf_unfiltered (file,
@@ -2917,6 +2926,32 @@ set_gdbarch_core_read_description (struc
 }
 
 int
+gdbarch_target_signal_from_target_p (struct gdbarch *gdbarch)
+{
+  gdb_assert (gdbarch != NULL);
+  return gdbarch->target_signal_from_target != NULL;
+}
+
+enum target_signal
+gdbarch_target_signal_from_target (struct gdbarch *gdbarch, int signo)
+{
+  gdb_assert (gdbarch != NULL);
+  if (gdbarch_debug >= 2)
+    fprintf_unfiltered (gdb_stdlog, 
+                        "gdbarch_target_signal_from_target called\n");
+  gdb_assert (gdbarch_target_signal_from_target_p (gdbarch));
+  return gdbarch->target_signal_from_target (signo);
+}
+
+void
+set_gdbarch_target_signal_from_target (struct gdbarch *gdbarch, 
+           gdbarch_target_signal_from_target_ftype target_signal_from_target)
+{
+  gdbarch->target_signal_from_target = target_signal_from_target;
+}
+
+
+int
 gdbarch_static_transform_name_p (struct gdbarch *gdbarch)
 {
   gdb_assert (gdbarch != NULL);
Index: gdb/corelow.c
===================================================================
RCS file: /cvs/src/src/gdb/corelow.c,v
retrieving revision 1.70
diff -u -3 -p -r1.70 corelow.c
--- gdb/corelow.c	15 Nov 2007 06:14:26 -0000	1.70
+++ gdb/corelow.c	13 Dec 2007 16:07:17 -0000
@@ -353,12 +353,19 @@ core_open (char *filename, int from_tty)
 
   siggy = bfd_core_file_failing_signal (core_bfd);
   if (siggy > 0)
+    {
+      enum target_signal gdb_sig;
+      if (core_gdbarch && gdbarch_target_signal_from_target_p (core_gdbarch))
+	gdb_sig = gdbarch_target_signal_from_target (core_gdbarch, siggy);
+      else
+	gdb_sig = target_signal_from_host (siggy);
     /* NOTE: target_signal_from_host() converts a target signal value
        into gdb's internal signal value.  Unfortunately gdb's internal
        value is called ``target_signal'' and this function got the
        name ..._from_host(). */
-    printf_filtered (_("Program terminated with signal %d, %s.\n"), siggy,
-		     target_signal_to_string (target_signal_from_host (siggy)));
+      printf_filtered (_("Program terminated with signal %d, %s.\n"), siggy,
+		     target_signal_to_string (gdb_sig));
+    }
 
   /* Build up thread list from BFD sections. */
 
@@ -496,7 +503,7 @@ get_core_registers (struct regcache *reg
   get_core_register_section (regcache,
 			     ".reg-xfp", 3, "extended floating-point", 0);
   get_core_register_section (regcache,
-  			     ".reg-ppc-vmx", 3, "ppc Altivec", 0);
+			     ".reg-ppc-vmx", 3, "ppc Altivec", 0);
 
   /* Supply dummy value for all registers not found in the core.  */
   for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)