2002-04-11 Daniel Jacobowitz <drow@mvista.com>

        * gdbserver/linux-low.c (usr_store_inferior_registers): Support
        registers which are allowed to fail to store.
        * gdbserver/linux-low.h (linux_target_ops): Likewise.
        * gdbserver/linux-ppc-low.c (ppc_regmap): Support FPSCR.
        (ppc_cannot_store_register): FPSCR may not be storable.
        * regformats/reg-ppc.dat: Support FPSCR.

3 files changed, 19 insertions, 10 deletions

diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index 8c729df2feb..bd1a87601f5 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -240,7 +240,7 @@ usr_store_inferior_registers (int regno)
       if (regno >= the_low_target.num_regs)
 	return;
 
-      if ((*the_low_target.cannot_store_register) (regno))
+      if ((*the_low_target.cannot_store_register) (regno) == 1)
 	return;
 
       regaddr = register_addr (regno);
@@ -254,14 +254,15 @@ usr_store_inferior_registers (int regno)
 		  *(int *) (register_data (regno) + i));
 	  if (errno != 0)
 	    {
-	      /* Warning, not error, in case we are attached; sometimes the
-		 kernel doesn't let us at the registers.  */
-	      char *err = strerror (errno);
-	      char *msg = alloca (strlen (err) + 128);
-	      sprintf (msg, "writing register %d: %s",
-		       regno, err);
-	      error (msg);
-	      return;
+	      if ((*the_low_target.cannot_store_register) (regno) == 0)
+		{
+		  char *err = strerror (errno);
+		  char *msg = alloca (strlen (err) + 128);
+		  sprintf (msg, "writing register %d: %s",
+			   regno, err);
+		  error (msg);
+		  return;
+		}
 	    }
 	  regaddr += sizeof (int);
 	}
diff --git a/gdb/gdbserver/linux-low.h b/gdb/gdbserver/linux-low.h
index 0d0050dcd58..e485a8ee013 100644
--- a/gdb/gdbserver/linux-low.h
+++ b/gdb/gdbserver/linux-low.h
@@ -34,6 +34,10 @@ struct linux_target_ops
   int num_regs;
   int *regmap;
   int (*cannot_fetch_register) (int);
+
+  /* Returns 0 if we can store the register, 1 if we can not
+     store the register, and 2 if failure to store the register
+     is acceptable.  */
   int (*cannot_store_register) (int);
 };
 
diff --git a/gdb/gdbserver/linux-ppc-low.c b/gdb/gdbserver/linux-ppc-low.c
index e626eab3cbc..7cb315a304a 100644
--- a/gdb/gdbserver/linux-ppc-low.c
+++ b/gdb/gdbserver/linux-ppc-low.c
@@ -46,11 +46,15 @@ static int ppc_regmap[] =
   PT_FPR0*4+192,  PT_FPR0*4+200,  PT_FPR0*4+208,  PT_FPR0*4+216,
   PT_FPR0*4+224,  PT_FPR0*4+232,  PT_FPR0*4+240,  PT_FPR0*4+248,
   PT_NIP * 4,    PT_MSR * 4,    PT_CCR * 4,    PT_LNK * 4,
-  PT_CTR * 4,    PT_XER * 4,    -1, };
+  PT_CTR * 4,    PT_XER * 4,    PT_FPSCR * 4, };
 
 static int
 ppc_cannot_store_register (int regno)
 {
+  /* Some kernels do not allow us to store fpscr.  */
+  if (regno == find_regno ("fpscr"))
+    return 2;
+
   return 0;
 }