[PATCH] Move some GNU/Linux-specific Alpha code to alpha-linux-tdep.c

[Jason R Thorpe <thorpej@wasabisystems.com>]

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Committed as obvious.

        * alpha-linux-tdep.c: New file.  Move alpha_linux_sigtramp_offset
        to here...
        * alpha-tdep.c: ...from here.
        * config/alpha/alpha-linux.mt (TDEPFILES): Add alpha-linux-tdep.o.

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>

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Index: alpha-linux-tdep.c
===================================================================
RCS file: alpha-linux-tdep.c
diff -N alpha-linux-tdep.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ alpha-linux-tdep.c	21 Apr 2002 20:53:53 -0000
@@ -0,0 +1,98 @@
+/* Target-dependent code for GNU/Linux on Alpha.
+   Copyright 2002 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "value.h"
+
+#include "alpha-tdep.h"
+
+/* Under GNU/Linux, signal handler invocations can be identified by the
+   designated code sequence that is used to return from a signal
+   handler.  In particular, the return address of a signal handler
+   points to the following sequence (the first instruction is quadword
+   aligned):
+  
+   bis $30,$30,$16
+   addq $31,0x67,$0
+   call_pal callsys 
+      
+   Each instruction has a unique encoding, so we simply attempt to
+   match the instruction the pc is pointing to with any of the above
+   instructions.  If there is a hit, we know the offset to the start
+   of the designated sequence and can then check whether we really are
+   executing in a designated sequence.  If not, -1 is returned,
+   otherwise the offset from the start of the desingated sequence is
+   returned.
+   
+   There is a slight chance of false hits: code could jump into the
+   middle of the designated sequence, in which case there is no
+   guarantee that we are in the middle of a sigreturn syscall.  Don't
+   think this will be a problem in praxis, though.  */
+long
+alpha_linux_sigtramp_offset (CORE_ADDR pc)
+{
+  unsigned int i[3], w;
+  long off;
+
+  if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
+    return -1;
+
+  off = -1;
+  switch (w)
+    {
+    case 0x47de0410:
+      off = 0;
+      break;			/* bis $30,$30,$16 */
+    case 0x43ecf400:
+      off = 4;
+      break;			/* addq $31,0x67,$0 */
+    case 0x00000083:
+      off = 8;
+      break;			/* call_pal callsys */
+    default:
+      return -1;
+    }
+  pc -= off;
+  if (pc & 0x7)
+    {
+      /* designated sequence is not quadword aligned */
+      return -1;
+    }
+  if (read_memory_nobpt (pc, (char *) i, sizeof (i)) != 0)
+    return -1;
+
+  if (i[0] == 0x47de0410 && i[1] == 0x43ecf400 && i[2] == 0x00000083)
+    return off;
+
+  return -1;
+}
+
+static void
+alpha_linux_init_abi (struct gdbarch_info info,
+                      struct gdbarch *gdbarch)
+{
+  /* Place holder. */
+}
+
+void
+_initialize_alpha_linux_tdep (void)
+{
+  alpha_gdbarch_register_os_abi (ALPHA_ABI_LINUX, alpha_linux_init_abi);
+}
Index: alpha-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/alpha-tdep.c,v
retrieving revision 1.24
diff -u -r1.24 alpha-tdep.c
--- alpha-tdep.c	21 Apr 2002 18:24:48 -0000	1.24
+++ alpha-tdep.c	21 Apr 2002 20:54:00 -0000
@@ -201,76 +201,6 @@
   return (func_name != NULL && STREQ ("__sigtramp", func_name));
 }
 
-/* Under GNU/Linux, signal handler invocations can be identified by the
-   designated code sequence that is used to return from a signal
-   handler.  In particular, the return address of a signal handler
-   points to the following sequence (the first instruction is quadword
-   aligned):
-
-   bis $30,$30,$16
-   addq $31,0x67,$0
-   call_pal callsys
-
-   Each instruction has a unique encoding, so we simply attempt to
-   match the instruction the pc is pointing to with any of the above
-   instructions.  If there is a hit, we know the offset to the start
-   of the designated sequence and can then check whether we really are
-   executing in a designated sequence.  If not, -1 is returned,
-   otherwise the offset from the start of the desingated sequence is
-   returned.
-
-   There is a slight chance of false hits: code could jump into the
-   middle of the designated sequence, in which case there is no
-   guarantee that we are in the middle of a sigreturn syscall.  Don't
-   think this will be a problem in praxis, though.
- */
-
-#ifndef TM_LINUXALPHA_H
-/* HACK: Provide a prototype when compiling this file for non
-   linuxalpha targets. */
-long alpha_linux_sigtramp_offset (CORE_ADDR pc);
-#endif
-long
-alpha_linux_sigtramp_offset (CORE_ADDR pc)
-{
-  unsigned int i[3], w;
-  long off;
-
-  if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
-    return -1;
-
-  off = -1;
-  switch (w)
-    {
-    case 0x47de0410:
-      off = 0;
-      break;			/* bis $30,$30,$16 */
-    case 0x43ecf400:
-      off = 4;
-      break;			/* addq $31,0x67,$0 */
-    case 0x00000083:
-      off = 8;
-      break;			/* call_pal callsys */
-    default:
-      return -1;
-    }
-  pc -= off;
-  if (pc & 0x7)
-    {
-      /* designated sequence is not quadword aligned */
-      return -1;
-    }
-
-  if (read_memory_nobpt (pc, (char *) i, sizeof (i)) != 0)
-    return -1;
-
-  if (i[0] == 0x47de0410 && i[1] == 0x43ecf400 && i[2] == 0x00000083)
-    return off;
-
-  return -1;
-}
-\f
-
 /* Under OSF/1, the __sigtramp routine is frameless and has a frame
    size of zero, but we are able to backtrace through it.  */
 CORE_ADDR
Index: config/alpha/alpha-linux.mt
===================================================================
RCS file: /cvs/src/src/gdb/config/alpha/alpha-linux.mt,v
retrieving revision 1.3
diff -u -r1.3 alpha-linux.mt
--- config/alpha/alpha-linux.mt	10 Mar 2001 06:17:20 -0000	1.3
+++ config/alpha/alpha-linux.mt	21 Apr 2002 20:54:03 -0000
@@ -1,3 +1,3 @@
 # Target: Little-endian Alpha
-TDEPFILES= alpha-tdep.o solib.o solib-svr4.o solib-legacy.o
+TDEPFILES= alpha-tdep.o alpha-linux-tdep.o solib.o solib-svr4.o solib-legacy.o
 TM_FILE= tm-alphalinux.h