* i386-linux-nat.c (OLD_CANNOT_FETCH_REGISTER,

	OLD_CANNOT_FETCH_REGISTER):  New definitions for accessible registers
	when accessing the registers via the U area.
	(fetch_register, store_register):  Use them.
	(cannot_fetch_register, cannot_store_register):  New functions,
	all registers should be accessible if we have GETREGS support.
	* config/i386/nm-linux.h:  Use cannot_fetch/store_register for
	CANNOT_FETCH/STORE_REGISTER definitions.

3 files changed, 40 insertions, 11 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index c8dacff..5ca71fe 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,14 @@
+2000-09-22  Peter Schauer  <pes@regent.e-technik.tu-muenchen.de>
+
+	* i386-linux-nat.c (OLD_CANNOT_FETCH_REGISTER,
+	OLD_CANNOT_FETCH_REGISTER):  New definitions for accessible registers
+	when accessing the registers via the U area.
+	(fetch_register, store_register):  Use them.
+	(cannot_fetch_register, cannot_store_register):  New functions,
+	all registers should be accessible if we have GETREGS support.
+	* config/i386/nm-linux.h:  Use cannot_fetch/store_register for
+	CANNOT_FETCH/STORE_REGISTER definitions.
+
 2000-09-06  Fred Fish  <fnf@cygnus.com>
 
 	* infttrace.c (update_thread_state_after_attach): Pass address
diff --git a/gdb/config/i386/nm-linux.h b/gdb/config/i386/nm-linux.h
index 6f83d38..c6bd54d 100644
--- a/gdb/config/i386/nm-linux.h
+++ b/gdb/config/i386/nm-linux.h
@@ -65,12 +65,14 @@ extern int kernel_u_size (void);
 /* Override copies of {fetch,store}_inferior_registers in `infptrace.c'.  */
 #define FETCH_INFERIOR_REGISTERS
 
-/* Nevertheless, define CANNOT_{FETCH,STORE}_REGISTER, because we fall
+/* Nevertheless, define CANNOT_{FETCH,STORE}_REGISTER, because we might fall
    back on the code `infptrace.c' (well a copy of that code in
    `i386-linux-nat.c' for now) and we can access only the
    general-purpose registers in that way.  */
-#define CANNOT_FETCH_REGISTER(regno) ((regno) >= NUM_GREGS)
-#define CANNOT_STORE_REGISTER(regno) CANNOT_FETCH_REGISTER (regno)
+extern int cannot_fetch_register (int regno);
+extern int cannot_store_register (int regno);
+#define CANNOT_FETCH_REGISTER(regno) cannot_store_register (regno)
+#define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno)
 
 /* Override child_resume in `infptrace.c'.  */
 #define CHILD_RESUME
diff --git a/gdb/i386-linux-nat.c b/gdb/i386-linux-nat.c
index 15e6a18..a1bc3d7 100644
--- a/gdb/i386-linux-nat.c
+++ b/gdb/i386-linux-nat.c
@@ -133,9 +133,7 @@ int have_ptrace_getfpxregs =
 #endif
 
 /* Registers we shouldn't try to fetch.  */
-#if !defined (CANNOT_FETCH_REGISTER)
-#define CANNOT_FETCH_REGISTER(regno) 0
-#endif
+#define OLD_CANNOT_FETCH_REGISTER(regno) ((regno) >= NUM_GREGS)
 
 /* Fetch one register.  */
 
@@ -150,7 +148,7 @@ fetch_register (int regno)
   char buf[MAX_REGISTER_RAW_SIZE];
   int tid;
 
-  if (CANNOT_FETCH_REGISTER (regno))
+  if (OLD_CANNOT_FETCH_REGISTER (regno))
     {
       memset (buf, '\0', REGISTER_RAW_SIZE (regno));	/* Supply zeroes */
       supply_register (regno, buf);
@@ -201,9 +199,7 @@ old_fetch_inferior_registers (int regno)
 }
 
 /* Registers we shouldn't try to store.  */
-#if !defined (CANNOT_STORE_REGISTER)
-#define CANNOT_STORE_REGISTER(regno) 0
-#endif
+#define OLD_CANNOT_STORE_REGISTER(regno) ((regno) >= NUM_GREGS)
 
 /* Store one register. */
 
@@ -217,7 +213,7 @@ store_register (int regno)
   unsigned int offset;		/* Offset of registers within the u area.  */
   int tid;
 
-  if (CANNOT_STORE_REGISTER (regno))
+  if (OLD_CANNOT_STORE_REGISTER (regno))
     {
       return;
     }
@@ -513,6 +509,26 @@ static void dummy_sse_values (void) {}
 
 /* Transferring arbitrary registers between GDB and inferior.  */
 
+/* Check if register REGNO in the child process is accessible.
+   If we are accessing registers directly via the U area, only the
+   general-purpose registers are available.
+   All registers should be accessible if we have GETREGS support.  */
+   
+int
+cannot_fetch_register (int regno)
+{
+  if (! have_ptrace_getregs)
+    return OLD_CANNOT_FETCH_REGISTER (regno);
+  return 0;
+}
+int
+cannot_store_register (int regno)
+{
+  if (! have_ptrace_getregs)
+    return OLD_CANNOT_STORE_REGISTER (regno);
+  return 0;
+}
+
 /* Fetch register REGNO from the child process.  If REGNO is -1, do
    this for all registers (including the floating point and SSE
    registers).  */