2007-04-05 H.J. Lu <hongjiu.lu@intel.com>

[deliverable/binutils-gdb.git] / gdb / remote.c

diff --git a/gdb/remote.c b/gdb/remote.c
index c46531079fe56007274091c373d15a346580837e..866c477b748f48b3fac2f53a09f785857e2ac101 100644 (file)
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -1,7 +1,7 @@
 /* Remote target communications for serial-line targets in custom GDB protocol
 
-   Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
-   1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
+   Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
+   1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
    Free Software Foundation, Inc.
 
    This file is part of GDB.
@@ -334,12 +334,19 @@ init_remote_state (struct gdbarch *gdbarch)
 
   rsa = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct remote_arch_state);
 
-  /* Assume a 1:1 regnum<->pnum table.  */
+  /* Use the architecture to build a regnum<->pnum table, which will be
+     1:1 unless a feature set specifies otherwise.  */
   rsa->regs = GDBARCH_OBSTACK_CALLOC (gdbarch, NUM_REGS, struct packet_reg);
   for (regnum = 0; regnum < NUM_REGS; regnum++)
     {
       struct packet_reg *r = &rsa->regs[regnum];
-      r->pnum = regnum;
+
+      if (register_size (current_gdbarch, regnum) == 0)
+       /* Do not try to fetch zero-sized (placeholder) registers.  */
+       r->pnum = -1;
+      else
+       r->pnum = gdbarch_remote_register_number (gdbarch, regnum);
+
       r->regnum = regnum;
     }
 
@@ -893,6 +900,7 @@ enum {
   PACKET_Z3,
   PACKET_Z4,
   PACKET_qXfer_auxv,
+  PACKET_qXfer_features,
   PACKET_qXfer_memory_map,
   PACKET_qGetTLSAddr,
   PACKET_qSupported,
@@ -2294,6 +2302,8 @@ static struct protocol_feature remote_protocol_features[] = {
   { "PacketSize", PACKET_DISABLE, remote_packet_size, -1 },
   { "qXfer:auxv:read", PACKET_DISABLE, remote_supported_packet,
     PACKET_qXfer_auxv },
+  { "qXfer:features:read", PACKET_DISABLE, remote_supported_packet,
+    PACKET_qXfer_features },
   { "qXfer:memory-map:read", PACKET_DISABLE, remote_supported_packet,
     PACKET_qXfer_memory_map },
   { "QPassSignals", PACKET_DISABLE, remote_supported_packet,
@@ -5098,35 +5108,6 @@ extended_remote_async_create_inferior (char *exec_file, char *args,
 }
 \f
 
-/* On some machines, e.g. 68k, we may use a different breakpoint
-   instruction than other targets; in those use
-   DEPRECATED_REMOTE_BREAKPOINT instead of just BREAKPOINT_FROM_PC.
-   Also, bi-endian targets may define
-   DEPRECATED_LITTLE_REMOTE_BREAKPOINT and
-   DEPRECATED_BIG_REMOTE_BREAKPOINT.  If none of these are defined, we
-   just call the standard routines that are in mem-break.c.  */
-
-/* NOTE: cagney/2003-06-08: This is silly.  A remote and simulator
-   target should use an identical BREAKPOINT_FROM_PC.  As for native,
-   the ARCH-OS-tdep.c code can override the default.  */
-
-#if defined (DEPRECATED_LITTLE_REMOTE_BREAKPOINT) && defined (DEPRECATED_BIG_REMOTE_BREAKPOINT) && !defined(DEPRECATED_REMOTE_BREAKPOINT)
-#define DEPRECATED_REMOTE_BREAKPOINT
-#endif
-
-#ifdef DEPRECATED_REMOTE_BREAKPOINT
-
-/* If the target isn't bi-endian, just pretend it is.  */
-#if !defined (DEPRECATED_LITTLE_REMOTE_BREAKPOINT) && !defined (DEPRECATED_BIG_REMOTE_BREAKPOINT)
-#define DEPRECATED_LITTLE_REMOTE_BREAKPOINT DEPRECATED_REMOTE_BREAKPOINT
-#define DEPRECATED_BIG_REMOTE_BREAKPOINT DEPRECATED_REMOTE_BREAKPOINT
-#endif
-
-static unsigned char big_break_insn[] = DEPRECATED_BIG_REMOTE_BREAKPOINT;
-static unsigned char little_break_insn[] = DEPRECATED_LITTLE_REMOTE_BREAKPOINT;
-
-#endif /* DEPRECATED_REMOTE_BREAKPOINT */
-
 /* Insert a breakpoint.  On targets that have software breakpoint
    support, we ask the remote target to do the work; on targets
    which don't, we insert a traditional memory breakpoint.  */
@@ -5136,9 +5117,6 @@ remote_insert_breakpoint (struct bp_target_info *bp_tgt)
 {
   CORE_ADDR addr = bp_tgt->placed_address;
   struct remote_state *rs = get_remote_state ();
-#ifdef DEPRECATED_REMOTE_BREAKPOINT
-  int val;
-#endif
 
   /* Try the "Z" s/w breakpoint packet if it is not already disabled.
      If it succeeds, then set the support to PACKET_ENABLE.  If it
@@ -5171,24 +5149,7 @@ remote_insert_breakpoint (struct bp_target_info *bp_tgt)
        }
     }
 
-#ifdef DEPRECATED_REMOTE_BREAKPOINT
-  bp_tgt->placed_size = bp_tgt->shadow_len = sizeof big_break_insn;
-  val = target_read_memory (addr, bp_tgt->shadow_contents, bp_tgt->shadow_len);
-
-  if (val == 0)
-    {
-      if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
-       val = target_write_memory (addr, (char *) big_break_insn,
-                                  sizeof big_break_insn);
-      else
-       val = target_write_memory (addr, (char *) little_break_insn,
-                                  sizeof little_break_insn);
-    }
-
-  return val;
-#else
   return memory_insert_breakpoint (bp_tgt);
-#endif /* DEPRECATED_REMOTE_BREAKPOINT */
 }
 
 static int
@@ -5216,12 +5177,7 @@ remote_remove_breakpoint (struct bp_target_info *bp_tgt)
       return (rs->buf[0] == 'E');
     }
 
-#ifdef DEPRECATED_REMOTE_BREAKPOINT
-  return target_write_memory (bp_tgt->placed_address, bp_tgt->shadow_contents,
-                             bp_tgt->shadow_len);
-#else
   return memory_remove_breakpoint (bp_tgt);
-#endif /* DEPRECATED_REMOTE_BREAKPOINT */
 }
 
 static int
@@ -5716,6 +5672,11 @@ remote_xfer_partial (struct target_ops *ops, enum target_object object,
       return remote_read_qxfer (ops, "auxv", annex, readbuf, offset, len,
                                &remote_protocol_packets[PACKET_qXfer_auxv]);
 
+    case TARGET_OBJECT_AVAILABLE_FEATURES:
+      return remote_read_qxfer
+       (ops, "features", annex, readbuf, offset, len,
+        &remote_protocol_packets[PACKET_qXfer_features]);
+
     case TARGET_OBJECT_MEMORY_MAP:
       gdb_assert (annex == NULL);
       return remote_read_qxfer (ops, "memory-map", annex, readbuf, offset, len,
@@ -6589,6 +6550,9 @@ Show the maximum size of the address (in bits) in a memory packet."), NULL,
   add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_auxv],
                         "qXfer:auxv:read", "read-aux-vector", 0);
 
+  add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_features],
+                        "qXfer:features:read", "target-features", 0);
+
   add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_memory_map],
                         "qXfer:memory-map:read", "memory-map", 0);