* alpha-tdep.c (alpha_supply_int_regs, alpha_fill_int_regs): New.

[deliverable/binutils-gdb.git] / gdb / alpha-tdep.c

diff --git a/gdb/alpha-tdep.c b/gdb/alpha-tdep.c
index 208c7f2fb69fa771c2fd305f1c00d333d7db33c6..74e891baffaca8898bd62a972401b273582844f2 100644 (file)
--- a/gdb/alpha-tdep.c
+++ b/gdb/alpha-tdep.c
@@ -20,7 +20,10 @@
    Boston, MA 02111-1307, USA.  */
 
 #include "defs.h"
    Boston, MA 02111-1307, USA.  */
 
 #include "defs.h"

+#include "doublest.h"

 #include "frame.h"
 #include "frame.h"

+#include "frame-unwind.h"
+#include "frame-base.h"

 #include "inferior.h"
 #include "symtab.h"
 #include "value.h"
 #include "inferior.h"
 #include "symtab.h"
 #include "value.h"


@@ -32,7 +35,7 @@
 #include "gdb_string.h"
 #include "linespec.h"
 #include "regcache.h"
 #include "gdb_string.h"
 #include "linespec.h"
 #include "regcache.h"

-#include "doublest.h"
+#include "reggroups.h"

 #include "arch-utils.h"
 #include "osabi.h"
 #include "block.h"
 #include "arch-utils.h"
 #include "osabi.h"
 #include "block.h"


@@ -41,245 +44,11 @@
 
 #include "alpha-tdep.h"
 
 
 #include "alpha-tdep.h"
 

-static gdbarch_init_ftype alpha_gdbarch_init;
-
-static gdbarch_register_name_ftype alpha_register_name;
-static gdbarch_register_raw_size_ftype alpha_register_raw_size;
-static gdbarch_register_virtual_size_ftype alpha_register_virtual_size;
-static gdbarch_register_virtual_type_ftype alpha_register_virtual_type;
-static gdbarch_register_byte_ftype alpha_register_byte;
-static gdbarch_cannot_fetch_register_ftype alpha_cannot_fetch_register;
-static gdbarch_cannot_store_register_ftype alpha_cannot_store_register;
-static gdbarch_register_convertible_ftype alpha_register_convertible;
-static gdbarch_register_convert_to_virtual_ftype
-    alpha_register_convert_to_virtual;
-static gdbarch_register_convert_to_raw_ftype alpha_register_convert_to_raw;
-static gdbarch_store_struct_return_ftype alpha_store_struct_return;
-static gdbarch_deprecated_extract_return_value_ftype alpha_extract_return_value;
-static gdbarch_deprecated_extract_struct_value_address_ftype
-    alpha_extract_struct_value_address;
-static gdbarch_use_struct_convention_ftype alpha_use_struct_convention;
-
-static gdbarch_breakpoint_from_pc_ftype alpha_breakpoint_from_pc;
-
-static gdbarch_frame_args_address_ftype alpha_frame_args_address;
-static gdbarch_frame_locals_address_ftype alpha_frame_locals_address;
-
-static gdbarch_skip_prologue_ftype alpha_skip_prologue;
-static gdbarch_saved_pc_after_call_ftype alpha_saved_pc_after_call;
-static gdbarch_frame_chain_ftype alpha_frame_chain;
-static gdbarch_frame_saved_pc_ftype alpha_frame_saved_pc;
-static gdbarch_frame_init_saved_regs_ftype alpha_frame_init_saved_regs;
-
-static gdbarch_push_arguments_ftype alpha_push_arguments;
-static gdbarch_push_dummy_frame_ftype alpha_push_dummy_frame;
-static gdbarch_pop_frame_ftype alpha_pop_frame;
-static gdbarch_fix_call_dummy_ftype alpha_fix_call_dummy;
-static gdbarch_init_extra_frame_info_ftype alpha_init_extra_frame_info;
-
-static gdbarch_get_longjmp_target_ftype alpha_get_longjmp_target;
-
-struct frame_extra_info
-  {
-    alpha_extra_func_info_t proc_desc;
-    int localoff;
-    int pc_reg;
-  };
-
-/* FIXME: Some of this code should perhaps be merged with mips-tdep.c.  */
-
-/* Prototypes for local functions. */
-
-static void alpha_find_saved_regs (struct frame_info *);
-
-static alpha_extra_func_info_t push_sigtramp_desc (CORE_ADDR low_addr);
-
-static CORE_ADDR read_next_frame_reg (struct frame_info *, int);
-
-static CORE_ADDR heuristic_proc_start (CORE_ADDR);
-
-static alpha_extra_func_info_t heuristic_proc_desc (CORE_ADDR,
-                                                   CORE_ADDR,
-                                                   struct frame_info *);
-
-static alpha_extra_func_info_t find_proc_desc (CORE_ADDR,
-                                              struct frame_info *);
-
-#if 0
-static int alpha_in_lenient_prologue (CORE_ADDR, CORE_ADDR);
-#endif
-
-static void reinit_frame_cache_sfunc (char *, int, struct cmd_list_element *);
-
-static CORE_ADDR after_prologue (CORE_ADDR pc,
-                                alpha_extra_func_info_t proc_desc);
-
-static int alpha_in_prologue (CORE_ADDR pc,
-                             alpha_extra_func_info_t proc_desc);
-
-static int alpha_about_to_return (CORE_ADDR pc);
-
-void _initialize_alpha_tdep (void);
-
-/* Heuristic_proc_start may hunt through the text section for a long
-   time across a 2400 baud serial line.  Allows the user to limit this
-   search.  */
-static unsigned int heuristic_fence_post = 0;
-/* *INDENT-OFF* */
-/* Layout of a stack frame on the alpha:
-
-                |                              |
- pdr members:  |  7th ... nth arg,             |
-                |  `pushed' by caller.         |
-                |                              |
-----------------|-------------------------------|<--  old_sp == vfp
-   ^  ^  ^  ^  |                               |
-   |  |  |  |  |                               |
-   |  |localoff        |  Copies of 1st .. 6th         |
-   |  |  |  |  |  argument if necessary.       |
-   |  |  |  v  |                               |
-   |  |  |  ---        |-------------------------------|<-- FRAME_LOCALS_ADDRESS
-   |  |  |      |                              |
-   |  |  |      |  Locals and temporaries.     |
-   |  |  |      |                              |
-   |  |  |      |-------------------------------|
-   |  |  |      |                              |
-   |-fregoffset        |  Saved float registers.       |
-   |  |  |      |  F9                          |
-   |  |  |      |   .                          |
-   |  |  |      |   .                          |
-   |  |  |      |  F2                          |
-   |  |  v      |                              |
-   |  |  -------|-------------------------------|
-   |  |         |                              |
-   |  |         |  Saved registers.            |
-   |  |         |  S6                          |
-   |-regoffset |   .                           |
-   |  |         |   .                          |
-   |  |         |  S0                          |
-   |  |         |  pdr.pcreg                   |
-   |  v         |                              |
-   |  ----------|-------------------------------|
-   |            |                              |
- frameoffset    |  Argument build area, gets   |
-   |            |  7th ... nth arg for any     |
-   |            |  called procedure.           |
-   v            |                              |
-   -------------|-------------------------------|<-- sp
-                |                              |
-*/
-/* *INDENT-ON* */
-
-#define PROC_LOW_ADDR(proc) ((proc)->pdr.adr)  /* least address */
-/* These next two fields are kind of being hijacked.  I wonder if
-   iline is too small for the values it needs to hold, if GDB is
-   running on a 32-bit host.  */
-#define PROC_HIGH_ADDR(proc) ((proc)->pdr.iline)       /* upper address bound */
-#define PROC_DUMMY_FRAME(proc) ((proc)->pdr.cbLineOffset)      /*CALL_DUMMY frame */
-#define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset)
-#define PROC_FRAME_REG(proc) ((proc)->pdr.framereg)
-#define PROC_REG_MASK(proc) ((proc)->pdr.regmask)
-#define PROC_FREG_MASK(proc) ((proc)->pdr.fregmask)
-#define PROC_REG_OFFSET(proc) ((proc)->pdr.regoffset)
-#define PROC_FREG_OFFSET(proc) ((proc)->pdr.fregoffset)
-#define PROC_PC_REG(proc) ((proc)->pdr.pcreg)
-#define PROC_LOCALOFF(proc) ((proc)->pdr.localoff)
-#define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->pdr.isym)
-#define _PROC_MAGIC_ 0x0F0F0F0F
-#define PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym == _PROC_MAGIC_)
-#define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym = _PROC_MAGIC_)
-
-struct linked_proc_info
-  {
-    struct alpha_extra_func_info info;
-    struct linked_proc_info *next;
-  }
- *linked_proc_desc_table = NULL;
-\f
-static CORE_ADDR
-alpha_frame_past_sigtramp_frame (struct frame_info *frame, CORE_ADDR pc)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
-  if (tdep->skip_sigtramp_frame != NULL)
-    return (tdep->skip_sigtramp_frame (frame, pc));
-
-  return (0);
-}
-
-static LONGEST
-alpha_dynamic_sigtramp_offset (CORE_ADDR pc)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
-  /* Must be provided by OS/ABI variant code if supported. */
-  if (tdep->dynamic_sigtramp_offset != NULL)
-    return (tdep->dynamic_sigtramp_offset (pc));
-
-  return (-1);
-}
-
-#define ALPHA_PROC_SIGTRAMP_MAGIC 0x0e0f0f0f
-
-/* Return TRUE if the procedure descriptor PROC is a procedure
-   descriptor that refers to a dynamically generated signal
-   trampoline routine.  */
-static int
-alpha_proc_desc_is_dyn_sigtramp (struct alpha_extra_func_info *proc)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
-  if (tdep->dynamic_sigtramp_offset != NULL)
-    return (proc->pdr.isym == ALPHA_PROC_SIGTRAMP_MAGIC);
-
-  return (0);
-}
-
-static void
-alpha_set_proc_desc_is_dyn_sigtramp (struct alpha_extra_func_info *proc)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
-  if (tdep->dynamic_sigtramp_offset != NULL)
-    proc->pdr.isym = ALPHA_PROC_SIGTRAMP_MAGIC;
-}
-
-/* Dynamically create a signal-handler caller procedure descriptor for
-   the signal-handler return code starting at address LOW_ADDR.  The
-   descriptor is added to the linked_proc_desc_table.  */
-
-static alpha_extra_func_info_t
-push_sigtramp_desc (CORE_ADDR low_addr)
-{
-  struct linked_proc_info *link;
-  alpha_extra_func_info_t proc_desc;
-
-  link = (struct linked_proc_info *)
-    xmalloc (sizeof (struct linked_proc_info));
-  link->next = linked_proc_desc_table;
-  linked_proc_desc_table = link;
-
-  proc_desc = &link->info;
-
-  proc_desc->numargs = 0;
-  PROC_LOW_ADDR (proc_desc) = low_addr;
-  PROC_HIGH_ADDR (proc_desc) = low_addr + 3 * 4;
-  PROC_DUMMY_FRAME (proc_desc) = 0;
-  PROC_FRAME_OFFSET (proc_desc) = 0x298;       /* sizeof(struct sigcontext_struct) */
-  PROC_FRAME_REG (proc_desc) = SP_REGNUM;
-  PROC_REG_MASK (proc_desc) = 0xffff;
-  PROC_FREG_MASK (proc_desc) = 0xffff;
-  PROC_PC_REG (proc_desc) = 26;
-  PROC_LOCALOFF (proc_desc) = 0;
-  alpha_set_proc_desc_is_dyn_sigtramp (proc_desc);
-  return (proc_desc);
-}

 \f
 \f

-

 static const char *
 alpha_register_name (int regno)
 {
 static const char *
 alpha_register_name (int regno)
 {

-  static char *register_names[] =
+  static const char * const register_names[] =

   {
     "v0",   "t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",
     "t7",   "s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "fp",
   {
     "v0",   "t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",
     "t7",   "s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "fp",


@@ -289,26 +58,26 @@ alpha_register_name (int regno)
     "f8",   "f9",   "f10",  "f11",  "f12",  "f13",  "f14",  "f15",
     "f16",  "f17",  "f18",  "f19",  "f20",  "f21",  "f22",  "f23",
     "f24",  "f25",  "f26",  "f27",  "f28",  "f29",  "f30",  "fpcr",
     "f8",   "f9",   "f10",  "f11",  "f12",  "f13",  "f14",  "f15",
     "f16",  "f17",  "f18",  "f19",  "f20",  "f21",  "f22",  "f23",
     "f24",  "f25",  "f26",  "f27",  "f28",  "f29",  "f30",  "fpcr",

-    "pc",   "vfp",  "unique",
+    "pc",   "",     "unique"

   };
 
   if (regno < 0)
   };
 
   if (regno < 0)

-    return (NULL);
+    return NULL;

   if (regno >= (sizeof(register_names) / sizeof(*register_names)))
   if (regno >= (sizeof(register_names) / sizeof(*register_names)))

-    return (NULL);
-  return (register_names[regno]);
+    return NULL;
+  return register_names[regno];

 }
 
 static int
 alpha_cannot_fetch_register (int regno)
 {
 }
 
 static int
 alpha_cannot_fetch_register (int regno)
 {

-  return (regno == FP_REGNUM || regno == ALPHA_ZERO_REGNUM);
+  return regno == ALPHA_ZERO_REGNUM;

 }
 
 static int
 alpha_cannot_store_register (int regno)
 {
 }
 
 static int
 alpha_cannot_store_register (int regno)
 {

-  return (regno == FP_REGNUM || regno == ALPHA_ZERO_REGNUM);
+  return regno == ALPHA_ZERO_REGNUM;

 }
 
 static int
 }
 
 static int


@@ -320,8 +89,50 @@ alpha_register_convertible (int regno)
 static struct type *
 alpha_register_virtual_type (int regno)
 {
 static struct type *
 alpha_register_virtual_type (int regno)
 {

-  return ((regno >= FP0_REGNUM && regno < (FP0_REGNUM+31))
-         ? builtin_type_double : builtin_type_long);
+  if (regno == ALPHA_SP_REGNUM || regno == ALPHA_GP_REGNUM)
+    return builtin_type_void_data_ptr;
+  if (regno == ALPHA_PC_REGNUM)
+    return builtin_type_void_func_ptr;
+
+  /* Don't need to worry about little vs big endian until 
+     some jerk tries to port to alpha-unicosmk.  */
+  if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 31)
+    return builtin_type_ieee_double_little;
+
+  return builtin_type_int64;
+}
+
+/* Is REGNUM a member of REGGROUP?  */
+
+static int
+alpha_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+                          struct reggroup *group)
+{
+  /* Filter out any registers eliminated, but whose regnum is 
+     reserved for backward compatibility, e.g. the vfp.  */
+  if (REGISTER_NAME (regnum) == NULL || *REGISTER_NAME (regnum) == '\0')
+    return 0;
+
+  /* Since we implement no pseudo registers, save/restore is equal to all. */
+  if (group == all_reggroup
+      || group == save_reggroup
+      || group == restore_reggroup)
+    return 1;
+
+  /* All other groups are non-overlapping.  */
+
+  /* Since this is really a PALcode memory slot...  */
+  if (regnum == ALPHA_UNIQUE_REGNUM)
+    return group == system_reggroup;
+
+  /* Force the FPCR to be considered part of the floating point state.  */
+  if (regnum == ALPHA_FPCR_REGNUM)
+    return group == float_reggroup;
+
+  if (regnum >= ALPHA_FP0_REGNUM && regnum < ALPHA_FP0_REGNUM + 31)
+    return group == float_reggroup;
+  else
+    return group == general_reggroup;

 }
 
 static int
 }
 
 static int


@@ -341,1224 +152,1060 @@ alpha_register_virtual_size (int regno)
 {
   return 8;
 }
 {
   return 8;
 }

-\f
-
-static CORE_ADDR
-alpha_sigcontext_addr (struct frame_info *fi)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);

 
 

-  if (tdep->sigcontext_addr)
-    return (tdep->sigcontext_addr (fi));
+/* The alpha needs a conversion between register and memory format if the
+   register is a floating point register and memory format is float, as the
+   register format must be double or memory format is an integer with 4
+   bytes or less, as the representation of integers in floating point
+   registers is different. */

 
 

-  return (0);
+static void
+alpha_convert_flt_dbl (void *out, const void *in)
+{
+  DOUBLEST d = extract_typed_floating (in, builtin_type_ieee_single_little);
+  store_typed_floating (out, builtin_type_ieee_double_little, d);

 }
 
 }
 

-/* Guaranteed to set frame->saved_regs to some values (it never leaves it
-   NULL).  */
+static void
+alpha_convert_dbl_flt (void *out, const void *in)
+{
+  DOUBLEST d = extract_typed_floating (in, builtin_type_ieee_double_little);
+  store_typed_floating (out, builtin_type_ieee_single_little, d);
+}

 
 static void
 
 static void

-alpha_find_saved_regs (struct frame_info *frame)
+alpha_register_convert_to_virtual (int regnum, struct type *valtype,
+                                  char *raw_buffer, char *virtual_buffer)

 {
 {

-  int ireg;
-  CORE_ADDR reg_position;
-  unsigned long mask;
-  alpha_extra_func_info_t proc_desc;
-  int returnreg;
-
-  frame_saved_regs_zalloc (frame);
-
-  /* If it is the frame for __sigtramp, the saved registers are located
-     in a sigcontext structure somewhere on the stack. __sigtramp
-     passes a pointer to the sigcontext structure on the stack.
-     If the stack layout for __sigtramp changes, or if sigcontext offsets
-     change, we might have to update this code.  */
-#ifndef SIGFRAME_PC_OFF
-#define SIGFRAME_PC_OFF                (2 * 8)
-#define SIGFRAME_REGSAVE_OFF   (4 * 8)
-#define SIGFRAME_FPREGSAVE_OFF (SIGFRAME_REGSAVE_OFF + 32 * 8 + 8)
-#endif
-  if ((get_frame_type (frame) == SIGTRAMP_FRAME))
+  if (TYPE_LENGTH (valtype) >= ALPHA_REGISTER_SIZE)

     {
     {

-      CORE_ADDR sigcontext_addr;
-
-      sigcontext_addr = alpha_sigcontext_addr (frame);
-      if (sigcontext_addr == 0)
-       {
-         /* Don't know where the sigcontext is; just bail.  */
-         return;
-       }
-      for (ireg = 0; ireg < 32; ireg++)
-       {
-         reg_position = sigcontext_addr + SIGFRAME_REGSAVE_OFF + ireg * 8;
-         get_frame_saved_regs (frame)[ireg] = reg_position;
-       }
-      for (ireg = 0; ireg < 32; ireg++)
-       {
-         reg_position = sigcontext_addr + SIGFRAME_FPREGSAVE_OFF + ireg * 8;
-         get_frame_saved_regs (frame)[FP0_REGNUM + ireg] = reg_position;
-       }
-      get_frame_saved_regs (frame)[PC_REGNUM] = sigcontext_addr + SIGFRAME_PC_OFF;
+      memcpy (virtual_buffer, raw_buffer, ALPHA_REGISTER_SIZE);

       return;
     }
 
       return;
     }
 

-  proc_desc = get_frame_extra_info (frame)->proc_desc;
-  if (proc_desc == NULL)
-    /* I'm not sure how/whether this can happen.  Normally when we can't
-       find a proc_desc, we "synthesize" one using heuristic_proc_desc
-       and set the saved_regs right away.  */
-    return;
-
-  /* Fill in the offsets for the registers which gen_mask says
-     were saved.  */
-
-  reg_position = get_frame_base (frame) + PROC_REG_OFFSET (proc_desc);
-  mask = PROC_REG_MASK (proc_desc);
+  /* Note that everything below is less than 8 bytes long.  */

 
 

-  returnreg = PROC_PC_REG (proc_desc);
-
-  /* Note that RA is always saved first, regardless of its actual
-     register number.  */
-  if (mask & (1 << returnreg))
+  if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
+    alpha_convert_dbl_flt (virtual_buffer, raw_buffer);
+  else if (TYPE_CODE (valtype) == TYPE_CODE_INT)

     {
     {

-      get_frame_saved_regs (frame)[returnreg] = reg_position;
-      reg_position += 8;
-      mask &= ~(1 << returnreg);       /* Clear bit for RA so we
-                                          don't save again later. */
+      ULONGEST l;
+      l = extract_unsigned_integer (raw_buffer, ALPHA_REGISTER_SIZE);
+      l = ((l >> 32) & 0xc0000000) | ((l >> 29) & 0x3fffffff);
+      store_unsigned_integer (virtual_buffer, TYPE_LENGTH (valtype), l);

     }
     }

-
-  for (ireg = 0; ireg <= 31; ++ireg)
-    if (mask & (1 << ireg))
-      {
-       get_frame_saved_regs (frame)[ireg] = reg_position;
-       reg_position += 8;
-      }
-
-  /* Fill in the offsets for the registers which float_mask says
-     were saved.  */
-
-  reg_position = get_frame_base (frame) + PROC_FREG_OFFSET (proc_desc);
-  mask = PROC_FREG_MASK (proc_desc);
-
-  for (ireg = 0; ireg <= 31; ++ireg)
-    if (mask & (1 << ireg))
-      {
-       get_frame_saved_regs (frame)[FP0_REGNUM + ireg] = reg_position;
-       reg_position += 8;
-      }
-
-  get_frame_saved_regs (frame)[PC_REGNUM] = get_frame_saved_regs (frame)[returnreg];
+  else
+    error ("Cannot retrieve value from floating point register");

 }
 
 static void
 }
 
 static void

-alpha_frame_init_saved_regs (struct frame_info *fi)
+alpha_register_convert_to_raw (struct type *valtype, int regnum,
+                              char *virtual_buffer, char *raw_buffer)

 {
 {

-  if (get_frame_saved_regs (fi) == NULL)
-    alpha_find_saved_regs (fi);
-  get_frame_saved_regs (fi)[SP_REGNUM] = get_frame_base (fi);
-}
+  if (TYPE_LENGTH (valtype) >= ALPHA_REGISTER_SIZE)
+    {
+      memcpy (raw_buffer, virtual_buffer, ALPHA_REGISTER_SIZE);
+      return;
+    }

 
 

-static CORE_ADDR
-alpha_init_frame_pc_first (int fromleaf, struct frame_info *prev)
-{
-  return (fromleaf ? SAVED_PC_AFTER_CALL (get_next_frame (prev)) 
-         : get_next_frame (prev) ? FRAME_SAVED_PC (get_next_frame (prev))
-         : read_pc ());
-}
+  /* Note that everything below is less than 8 bytes long.  */

 
 

-static CORE_ADDR
-read_next_frame_reg (struct frame_info *fi, int regno)
-{
-  for (; fi; fi = get_next_frame (fi))
+  if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
+    alpha_convert_flt_dbl (raw_buffer, virtual_buffer);
+  else if (TYPE_CODE (valtype) == TYPE_CODE_INT)

     {
     {

-      /* We have to get the saved sp from the sigcontext
-         if it is a signal handler frame.  */
-      if (regno == SP_REGNUM && !(get_frame_type (fi) == SIGTRAMP_FRAME))
-       return get_frame_base (fi);
-      else
-       {
-         if (get_frame_saved_regs (fi) == NULL)
-           alpha_find_saved_regs (fi);
-         if (get_frame_saved_regs (fi)[regno])
-           return read_memory_integer (get_frame_saved_regs (fi)[regno], 8);
-       }
+      ULONGEST l = unpack_long (valtype, virtual_buffer);
+      l = ((l & 0xc0000000) << 32) | ((l & 0x3fffffff) << 29);
+      store_unsigned_integer (raw_buffer, ALPHA_REGISTER_SIZE, l);

     }
     }

-  return read_register (regno);
+  else
+    error ("Cannot store value in floating point register");

 }
 
 }
 

-static CORE_ADDR
-alpha_frame_saved_pc (struct frame_info *frame)
-{
-  alpha_extra_func_info_t proc_desc = get_frame_extra_info (frame)->proc_desc;
-  /* We have to get the saved pc from the sigcontext
-     if it is a signal handler frame.  */
-  int pcreg = ((get_frame_type (frame) == SIGTRAMP_FRAME)
-              ? PC_REGNUM
-              : get_frame_extra_info (frame)->pc_reg);
+\f
+/* The alpha passes the first six arguments in the registers, the rest on
+   the stack.  The register arguments are stored in ARG_REG_BUFFER, and
+   then moved into the register file; this simplifies the passing of a
+   large struct which extends from the registers to the stack, plus avoids
+   three ptrace invocations per word.

 
 

-  if (proc_desc && PROC_DESC_IS_DUMMY (proc_desc))
-    return read_memory_integer  (get_frame_base (frame) - 8, 8);
+   We don't bother tracking which register values should go in integer
+   regs or fp regs; we load the same values into both.

 
 

-  return read_next_frame_reg (frame, pcreg);
-}
+   If the called function is returning a structure, the address of the
+   structure to be returned is passed as a hidden first argument.  */

 
 static CORE_ADDR
 
 static CORE_ADDR

-alpha_saved_pc_after_call (struct frame_info *frame)
+alpha_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr,
+                      struct regcache *regcache, CORE_ADDR bp_addr,
+                      int nargs, struct value **args, CORE_ADDR sp,
+                      int struct_return, CORE_ADDR struct_addr)

 {
 {

-  CORE_ADDR pc = get_frame_pc (frame);
-  CORE_ADDR tmp;
-  alpha_extra_func_info_t proc_desc;
-  int pcreg;
-
-  /* Skip over shared library trampoline if necessary.  */
-  tmp = SKIP_TRAMPOLINE_CODE (pc);
-  if (tmp != 0)
-    pc = tmp;
-
-  proc_desc = find_proc_desc (pc, get_next_frame (frame));
-  pcreg = proc_desc ? PROC_PC_REG (proc_desc) : ALPHA_RA_REGNUM;
-
-  if ((get_frame_type (frame) == SIGTRAMP_FRAME))
-    return alpha_frame_saved_pc (frame);
-  else
-    return read_register (pcreg);
-}
+  int i;
+  int accumulate_size = struct_return ? 8 : 0;
+  struct alpha_arg
+    {
+      char *contents;
+      int len;
+      int offset;
+    };
+  struct alpha_arg *alpha_args
+    = (struct alpha_arg *) alloca (nargs * sizeof (struct alpha_arg));
+  register struct alpha_arg *m_arg;
+  char arg_reg_buffer[ALPHA_REGISTER_SIZE * ALPHA_NUM_ARG_REGS];
+  int required_arg_regs;

 
 

+  /* The ABI places the address of the called function in T12.  */
+  regcache_cooked_write_signed (regcache, ALPHA_T12_REGNUM, func_addr);

 
 

-static struct alpha_extra_func_info temp_proc_desc;
-static CORE_ADDR temp_saved_regs[ALPHA_NUM_REGS];
+  /* Set the return address register to point to the entry point
+     of the program, where a breakpoint lies in wait.  */
+  regcache_cooked_write_signed (regcache, ALPHA_RA_REGNUM, bp_addr);

 
 

-/* Nonzero if instruction at PC is a return instruction.  "ret
-   $zero,($ra),1" on alpha. */
+  /* Lay out the arguments in memory.  */
+  for (i = 0, m_arg = alpha_args; i < nargs; i++, m_arg++)
+    {
+      struct value *arg = args[i];
+      struct type *arg_type = check_typedef (VALUE_TYPE (arg));

 
 

-static int
-alpha_about_to_return (CORE_ADDR pc)
-{
-  return read_memory_integer (pc, 4) == 0x6bfa8001;
-}
+      /* Cast argument to long if necessary as the compiler does it too.  */
+      switch (TYPE_CODE (arg_type))
+       {
+       case TYPE_CODE_INT:
+       case TYPE_CODE_BOOL:
+       case TYPE_CODE_CHAR:
+       case TYPE_CODE_RANGE:
+       case TYPE_CODE_ENUM:
+         if (TYPE_LENGTH (arg_type) == 4)
+           {
+             /* 32-bit values must be sign-extended to 64 bits
+                even if the base data type is unsigned.  */
+             arg_type = builtin_type_int32;
+             arg = value_cast (arg_type, arg);
+           }
+         if (TYPE_LENGTH (arg_type) < ALPHA_REGISTER_SIZE)
+           {
+             arg_type = builtin_type_int64;
+             arg = value_cast (arg_type, arg);
+           }
+         break;

 
 

+       case TYPE_CODE_FLT:
+         /* "float" arguments loaded in registers must be passed in
+            register format, aka "double".  */
+         if (accumulate_size < sizeof (arg_reg_buffer)
+             && TYPE_LENGTH (arg_type) == 4)
+           {
+             arg_type = builtin_type_ieee_double_little;
+             arg = value_cast (arg_type, arg);
+           }
+         /* Tru64 5.1 has a 128-bit long double, and passes this by
+            invisible reference.  No one else uses this data type.  */
+         else if (TYPE_LENGTH (arg_type) == 16)
+           {
+             /* Allocate aligned storage.  */
+             sp = (sp & -16) - 16;

 
 

+             /* Write the real data into the stack.  */
+             write_memory (sp, VALUE_CONTENTS (arg), 16);

 
 

-/* This fencepost looks highly suspicious to me.  Removing it also
-   seems suspicious as it could affect remote debugging across serial
-   lines.  */
+             /* Construct the indirection.  */
+             arg_type = lookup_pointer_type (arg_type);
+             arg = value_from_pointer (arg_type, sp);
+           }
+         break;

 
 

-static CORE_ADDR
-heuristic_proc_start (CORE_ADDR pc)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-  CORE_ADDR start_pc = pc;
-  CORE_ADDR fence = start_pc - heuristic_fence_post;
+       case TYPE_CODE_COMPLEX:
+         /* ??? The ABI says that complex values are passed as two
+            separate scalar values.  This distinction only matters
+            for complex float.  However, GCC does not implement this.  */

 
 

-  if (start_pc == 0)
-    return 0;
+         /* Tru64 5.1 has a 128-bit long double, and passes this by
+            invisible reference.  */
+         if (TYPE_LENGTH (arg_type) == 32)
+           {
+             /* Allocate aligned storage.  */
+             sp = (sp & -16) - 16;

 
 

-  if (heuristic_fence_post == UINT_MAX
-      || fence < tdep->vm_min_address)
-    fence = tdep->vm_min_address;
+             /* Write the real data into the stack.  */
+             write_memory (sp, VALUE_CONTENTS (arg), 32);

 
 

-  /* search back for previous return */
-  for (start_pc -= 4;; start_pc -= 4)
-    if (start_pc < fence)
-      {
-       /* It's not clear to me why we reach this point when
-          stop_soon_quietly, but with this test, at least we
-          don't print out warnings for every child forked (eg, on
-          decstation).  22apr93 rich@cygnus.com.  */
-       if (!stop_soon_quietly)
-         {
-           static int blurb_printed = 0;
-
-           if (fence == tdep->vm_min_address)
-             warning ("Hit beginning of text section without finding");
-           else
-             warning ("Hit heuristic-fence-post without finding");
-
-           warning ("enclosing function for address 0x%s", paddr_nz (pc));
-           if (!blurb_printed)
-             {
-               printf_filtered ("\
-This warning occurs if you are debugging a function without any symbols\n\
-(for example, in a stripped executable).  In that case, you may wish to\n\
-increase the size of the search with the `set heuristic-fence-post' command.\n\
-\n\
-Otherwise, you told GDB there was a function where there isn't one, or\n\
-(more likely) you have encountered a bug in GDB.\n");
-               blurb_printed = 1;
-             }
-         }
+             /* Construct the indirection.  */
+             arg_type = lookup_pointer_type (arg_type);
+             arg = value_from_pointer (arg_type, sp);
+           }
+         break;

 
 

-       return 0;
-      }
-    else if (alpha_about_to_return (start_pc))
-      break;
+       default:
+         break;
+       }
+      m_arg->len = TYPE_LENGTH (arg_type);
+      m_arg->offset = accumulate_size;
+      accumulate_size = (accumulate_size + m_arg->len + 7) & ~7;
+      m_arg->contents = VALUE_CONTENTS (arg);
+    }

 
 

-  start_pc += 4;               /* skip return */
-  return start_pc;
-}
+  /* Determine required argument register loads, loading an argument register
+     is expensive as it uses three ptrace calls.  */
+  required_arg_regs = accumulate_size / 8;
+  if (required_arg_regs > ALPHA_NUM_ARG_REGS)
+    required_arg_regs = ALPHA_NUM_ARG_REGS;

 
 

-static alpha_extra_func_info_t
-heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc,
-                    struct frame_info *next_frame)
-{
-  CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM);
-  CORE_ADDR vfp = sp;
-  CORE_ADDR cur_pc;
-  int frame_size;
-  int has_frame_reg = 0;
-  unsigned long reg_mask = 0;
-  int pcreg = -1;
-  int regno;
+  /* Make room for the arguments on the stack.  */
+  if (accumulate_size < sizeof(arg_reg_buffer))
+    accumulate_size = 0;
+  else
+    accumulate_size -= sizeof(arg_reg_buffer);
+  sp -= accumulate_size;

 
 

-  if (start_pc == 0)
-    return NULL;
-  memset (&temp_proc_desc, '\0', sizeof (temp_proc_desc));
-  memset (&temp_saved_regs, '\0', SIZEOF_FRAME_SAVED_REGS);
-  PROC_LOW_ADDR (&temp_proc_desc) = start_pc;
+  /* Keep sp aligned to a multiple of 16 as the ABI requires.  */
+  sp &= ~15;

 
 

-  if (start_pc + 200 < limit_pc)
-    limit_pc = start_pc + 200;
-  frame_size = 0;
-  for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4)
+  /* `Push' arguments on the stack.  */
+  for (i = nargs; m_arg--, --i >= 0;)

     {
     {

-      char buf[4];
-      unsigned long word;
-      int status;
+      char *contents = m_arg->contents;
+      int offset = m_arg->offset;
+      int len = m_arg->len;

 
 

-      status = read_memory_nobpt (cur_pc, buf, 4);
-      if (status)
-       memory_error (status, cur_pc);
-      word = extract_unsigned_integer (buf, 4);
-
-      if ((word & 0xffff0000) == 0x23de0000)   /* lda $sp,n($sp) */
-       {
-         if (word & 0x8000)
-          {
-            /* Consider only the first stack allocation instruction
-               to contain the static size of the frame. */
-            if (frame_size == 0)
-               frame_size += (-word) & 0xffff;
-          }
-         else
-           /* Exit loop if a positive stack adjustment is found, which
-              usually means that the stack cleanup code in the function
-              epilogue is reached.  */
-           break;
-       }
-      else if ((word & 0xfc1f0000) == 0xb41e0000       /* stq reg,n($sp) */
-              && (word & 0xffff0000) != 0xb7fe0000)    /* reg != $zero */
-       {
-         int reg = (word & 0x03e00000) >> 21;
-         reg_mask |= 1 << reg;
-
-          /* Do not compute the address where the register was saved yet,
-             because we don't know yet if the offset will need to be
-             relative to $sp or $fp (we can not compute the address relative
-             to $sp if $sp is updated during the execution of the current
-             subroutine, for instance when doing some alloca). So just store
-             the offset for the moment, and compute the address later
-             when we know whether this frame has a frame pointer or not.
-           */
-          temp_saved_regs[reg] = (short) word;
-
-         /* Starting with OSF/1-3.2C, the system libraries are shipped
-            without local symbols, but they still contain procedure
-            descriptors without a symbol reference. GDB is currently
-            unable to find these procedure descriptors and uses
-            heuristic_proc_desc instead.
-            As some low level compiler support routines (__div*, __add*)
-            use a non-standard return address register, we have to
-            add some heuristics to determine the return address register,
-            or stepping over these routines will fail.
-            Usually the return address register is the first register
-            saved on the stack, but assembler optimization might
-            rearrange the register saves.
-            So we recognize only a few registers (t7, t9, ra) within
-            the procedure prologue as valid return address registers.
-            If we encounter a return instruction, we extract the
-            the return address register from it.
-
-            FIXME: Rewriting GDB to access the procedure descriptors,
-            e.g. via the minimal symbol table, might obviate this hack.  */
-         if (pcreg == -1
-             && cur_pc < (start_pc + 80)
-             && (reg == ALPHA_T7_REGNUM || reg == ALPHA_T9_REGNUM
-                 || reg == ALPHA_RA_REGNUM))
-           pcreg = reg;
-       }
-      else if ((word & 0xffe0ffff) == 0x6be08001)      /* ret zero,reg,1 */
-       pcreg = (word >> 16) & 0x1f;
-      else if (word == 0x47de040f || word == 0x47fe040f) /* bis sp,sp fp */
-        {
-          /* ??? I am not sure what instruction is 0x47fe040f, and I
-             am suspecting that there was a typo and should have been
-             0x47fe040f. I'm keeping it in the test above until further
-             investigation */
-           has_frame_reg = 1;
-          vfp = read_next_frame_reg (next_frame, ALPHA_GCC_FP_REGNUM);
-        }
-    }
-  if (pcreg == -1)
-    {
-      /* If we haven't found a valid return address register yet,
-         keep searching in the procedure prologue.  */
-      while (cur_pc < (limit_pc + 80) && cur_pc < (start_pc + 80))
+      /* Copy the bytes destined for registers into arg_reg_buffer.  */
+      if (offset < sizeof(arg_reg_buffer))

        {
        {

-         char buf[4];
-         unsigned long word;
-
-         if (read_memory_nobpt (cur_pc, buf, 4))
-           break;
-         cur_pc += 4;
-         word = extract_unsigned_integer (buf, 4);
-
-         if ((word & 0xfc1f0000) == 0xb41e0000         /* stq reg,n($sp) */
-             && (word & 0xffff0000) != 0xb7fe0000)     /* reg != $zero */
+         if (offset + len <= sizeof(arg_reg_buffer))

            {
            {

-             int reg = (word & 0x03e00000) >> 21;
-             if (reg == ALPHA_T7_REGNUM || reg == ALPHA_T9_REGNUM
-                 || reg == ALPHA_RA_REGNUM)
-               {
-                 pcreg = reg;
-                 break;
-               }
+             memcpy (arg_reg_buffer + offset, contents, len);
+             continue;

            }
            }

-         else if ((word & 0xffe0ffff) == 0x6be08001)   /* ret zero,reg,1 */
+         else

            {
            {

-             pcreg = (word >> 16) & 0x1f;
-             break;
+             int tlen = sizeof(arg_reg_buffer) - offset;
+             memcpy (arg_reg_buffer + offset, contents, tlen);
+             offset += tlen;
+             contents += tlen;
+             len -= tlen;

            }
        }
            }
        }

+
+      /* Everything else goes to the stack.  */
+      write_memory (sp + offset - sizeof(arg_reg_buffer), contents, len);

     }
     }

+  if (struct_return)
+    store_unsigned_integer (arg_reg_buffer, ALPHA_REGISTER_SIZE, struct_addr);

 
 

-  if (has_frame_reg)
-    PROC_FRAME_REG (&temp_proc_desc) = ALPHA_GCC_FP_REGNUM;
-  else
-    PROC_FRAME_REG (&temp_proc_desc) = SP_REGNUM;
-
-  /* At this point, we know which of the Stack Pointer or the Frame Pointer
-     to use as the reference address to compute the saved registers address.
-     But in both cases, the processing above has set vfp to this reference
-     address, so just need to increment the offset of each saved register
-     by this address. */
-  for (regno = 0; regno < NUM_REGS; regno++)
+  /* Load the argument registers.  */
+  for (i = 0; i < required_arg_regs; i++)

     {
     {

-      if (reg_mask & 1 << regno)
-       temp_saved_regs[regno] += vfp;
+      regcache_cooked_write (regcache, ALPHA_A0_REGNUM + i,
+                            arg_reg_buffer + i*ALPHA_REGISTER_SIZE);
+      regcache_cooked_write (regcache, ALPHA_FPA0_REGNUM + i,
+                            arg_reg_buffer + i*ALPHA_REGISTER_SIZE);

     }
 
     }
 

-  PROC_FRAME_OFFSET (&temp_proc_desc) = frame_size;
-  PROC_REG_MASK (&temp_proc_desc) = reg_mask;
-  PROC_PC_REG (&temp_proc_desc) = (pcreg == -1) ? ALPHA_RA_REGNUM : pcreg;
-  PROC_LOCALOFF (&temp_proc_desc) = 0; /* XXX - bogus */
-  return &temp_proc_desc;
+  /* Finally, update the stack pointer.  */
+  regcache_cooked_write_signed (regcache, ALPHA_SP_REGNUM, sp);
+
+  return sp;

 }
 
 }
 

-/* This returns the PC of the first inst after the prologue.  If we can't
-   find the prologue, then return 0.  */
+/* Extract from REGCACHE the value about to be returned from a function
+   and copy it into VALBUF.  */

 
 

-static CORE_ADDR
-after_prologue (CORE_ADDR pc, alpha_extra_func_info_t proc_desc)
+static void
+alpha_extract_return_value (struct type *valtype, struct regcache *regcache,
+                           void *valbuf)

 {
 {

-  struct symtab_and_line sal;
-  CORE_ADDR func_addr, func_end;
-
-  if (!proc_desc)
-    proc_desc = find_proc_desc (pc, NULL);
+  int length = TYPE_LENGTH (valtype);
+  char raw_buffer[ALPHA_REGISTER_SIZE];
+  ULONGEST l;

 
 

-  if (proc_desc)
+  switch (TYPE_CODE (valtype))

     {
     {

-      if (alpha_proc_desc_is_dyn_sigtramp (proc_desc))
-       return PROC_LOW_ADDR (proc_desc);       /* "prologue" is in kernel */
-
-      /* If function is frameless, then we need to do it the hard way.  I
-         strongly suspect that frameless always means prologueless... */
-      if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
-         && PROC_FRAME_OFFSET (proc_desc) == 0)
-       return 0;
-    }
+    case TYPE_CODE_FLT:
+      switch (length)
+       {
+       case 4:
+         regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, raw_buffer);
+         alpha_convert_dbl_flt (valbuf, raw_buffer);
+         break;

 
 

-  if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
-    return 0;                  /* Unknown */
+       case 8:
+         regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, valbuf);
+         break;

 
 

-  sal = find_pc_line (func_addr, 0);
+       case 16:
+         regcache_cooked_read_unsigned (regcache, ALPHA_V0_REGNUM, &l);
+         read_memory (l, valbuf, 16);
+         break;

 
 

-  if (sal.end < func_end)
-    return sal.end;
+       default:
+         internal_error (__FILE__, __LINE__, "unknown floating point width");
+       }
+      break;

 
 

-  /* The line after the prologue is after the end of the function.  In this
-     case, tell the caller to find the prologue the hard way.  */
+    case TYPE_CODE_COMPLEX:
+      switch (length)
+       {
+       case 8:
+         /* ??? This isn't correct wrt the ABI, but it's what GCC does.  */
+         regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, valbuf);
+         break;

 
 

-  return 0;
-}
+       case 16:
+         regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, valbuf);
+         regcache_cooked_read (regcache, ALPHA_FP0_REGNUM+1,
+                               (char *)valbuf + 8);
+         break;

 
 

-/* Return non-zero if we *might* be in a function prologue.  Return zero if we
-   are definitively *not* in a function prologue.  */
+       case 32:
+         regcache_cooked_read_signed (regcache, ALPHA_V0_REGNUM, &l);
+         read_memory (l, valbuf, 32);
+         break;

 
 

-static int
-alpha_in_prologue (CORE_ADDR pc, alpha_extra_func_info_t proc_desc)
-{
-  CORE_ADDR after_prologue_pc;
+       default:
+         internal_error (__FILE__, __LINE__, "unknown floating point width");
+       }
+      break;

 
 

-  after_prologue_pc = after_prologue (pc, proc_desc);
+    default:
+      /* Assume everything else degenerates to an integer.  */
+      regcache_cooked_read_unsigned (regcache, ALPHA_V0_REGNUM, &l);
+      store_unsigned_integer (valbuf, length, l);
+      break;
+    }
+}

 
 

-  if (after_prologue_pc == 0
-      || pc < after_prologue_pc)
-    return 1;
-  else
-    return 0;
+/* Extract from REGCACHE the address of a structure about to be returned
+   from a function.  */
+
+static CORE_ADDR
+alpha_extract_struct_value_address (struct regcache *regcache)
+{
+  ULONGEST addr;
+  regcache_cooked_read_unsigned (regcache, ALPHA_V0_REGNUM, &addr);
+  return addr;

 }
 
 }
 

-static alpha_extra_func_info_t
-find_proc_desc (CORE_ADDR pc, struct frame_info *next_frame)
+/* Insert the given value into REGCACHE as if it was being 
+   returned by a function.  */
+
+static void
+alpha_store_return_value (struct type *valtype, struct regcache *regcache,
+                         const void *valbuf)

 {
 {

-  alpha_extra_func_info_t proc_desc;
-  struct block *b;
-  struct symbol *sym;
-  CORE_ADDR startaddr;
-
-  /* Try to get the proc_desc from the linked call dummy proc_descs
-     if the pc is in the call dummy.
-     This is hairy. In the case of nested dummy calls we have to find the
-     right proc_desc, but we might not yet know the frame for the dummy
-     as it will be contained in the proc_desc we are searching for.
-     So we have to find the proc_desc whose frame is closest to the current
-     stack pointer.  */
-
-  if (DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0))
-    {
-      struct linked_proc_info *link;
-      CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM);
-      alpha_extra_func_info_t found_proc_desc = NULL;
-      long min_distance = LONG_MAX;
+  int length = TYPE_LENGTH (valtype);
+  char raw_buffer[ALPHA_REGISTER_SIZE];
+  ULONGEST l;

 
 

-      for (link = linked_proc_desc_table; link; link = link->next)
+  switch (TYPE_CODE (valtype))
+    {
+    case TYPE_CODE_FLT:
+      switch (length)

        {
        {

-         long distance = (CORE_ADDR) PROC_DUMMY_FRAME (&link->info) - sp;
-         if (distance > 0 && distance < min_distance)
-           {
-             min_distance = distance;
-             found_proc_desc = &link->info;
-           }
-       }
-      if (found_proc_desc != NULL)
-       return found_proc_desc;
-    }
+       case 4:
+         alpha_convert_flt_dbl (raw_buffer, valbuf);
+         regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, raw_buffer);
+         break;

 
 

-  b = block_for_pc (pc);
+       case 8:
+         regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, valbuf);
+         break;

 
 

-  find_pc_partial_function (pc, NULL, &startaddr, NULL);
-  if (b == NULL)
-    sym = NULL;
-  else
-    {
-      if (startaddr > BLOCK_START (b))
-       /* This is the "pathological" case referred to in a comment in
-          print_frame_info.  It might be better to move this check into
-          symbol reading.  */
-       sym = NULL;
-      else
-       sym = lookup_symbol (MIPS_EFI_SYMBOL_NAME, b, LABEL_NAMESPACE,
-                            0, NULL);
-    }
+       case 16:
+         /* FIXME: 128-bit long doubles are returned like structures:
+            by writing into indirect storage provided by the caller
+            as the first argument.  */
+         error ("Cannot set a 128-bit long double return value.");

 
 

-  /* If we never found a PDR for this function in symbol reading, then
-     examine prologues to find the information.  */
-  if (sym && ((mips_extra_func_info_t) SYMBOL_VALUE (sym))->pdr.framereg == -1)
-    sym = NULL;
+       default:
+         internal_error (__FILE__, __LINE__, "unknown floating point width");
+       }
+      break;

 
 

-  if (sym)
-    {
-      /* IF this is the topmost frame AND
-       * (this proc does not have debugging information OR
-       * the PC is in the procedure prologue)
-       * THEN create a "heuristic" proc_desc (by analyzing
-       * the actual code) to replace the "official" proc_desc.
-       */
-      proc_desc = (alpha_extra_func_info_t) SYMBOL_VALUE (sym);
-      if (next_frame == NULL)
+    case TYPE_CODE_COMPLEX:
+      switch (length)

        {
        {

-         if (PROC_DESC_IS_DUMMY (proc_desc) || alpha_in_prologue (pc, proc_desc))
-           {
-             alpha_extra_func_info_t found_heuristic =
-             heuristic_proc_desc (PROC_LOW_ADDR (proc_desc),
-                                  pc, next_frame);
-             if (found_heuristic)
-               {
-                 PROC_LOCALOFF (found_heuristic) =
-                   PROC_LOCALOFF (proc_desc);
-                 PROC_PC_REG (found_heuristic) = PROC_PC_REG (proc_desc);
-                 proc_desc = found_heuristic;
-               }
-           }
+       case 8:
+         /* ??? This isn't correct wrt the ABI, but it's what GCC does.  */
+         regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, valbuf);
+         break;
+
+       case 16:
+         regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, valbuf);
+         regcache_cooked_write (regcache, ALPHA_FP0_REGNUM+1,
+                                (const char *)valbuf + 8);
+         break;
+
+       case 32:
+         /* FIXME: 128-bit long doubles are returned like structures:
+            by writing into indirect storage provided by the caller
+            as the first argument.  */
+         error ("Cannot set a 128-bit long double return value.");
+
+       default:
+         internal_error (__FILE__, __LINE__, "unknown floating point width");

        }
        }

+      break;
+
+    default:
+      /* Assume everything else degenerates to an integer.  */
+      /* 32-bit values must be sign-extended to 64 bits
+        even if the base data type is unsigned.  */
+      if (length == 4)
+       valtype = builtin_type_int32;
+      l = unpack_long (valtype, valbuf);
+      regcache_cooked_write_unsigned (regcache, ALPHA_V0_REGNUM, l);
+      break;

     }
     }

-  else
-    {
-      long offset;
-
-      /* Is linked_proc_desc_table really necessary?  It only seems to be used
-         by procedure call dummys.  However, the procedures being called ought
-         to have their own proc_descs, and even if they don't,
-         heuristic_proc_desc knows how to create them! */
-
-      register struct linked_proc_info *link;
-      for (link = linked_proc_desc_table; link; link = link->next)
-       if (PROC_LOW_ADDR (&link->info) <= pc
-           && PROC_HIGH_ADDR (&link->info) > pc)
-         return &link->info;
-
-      /* If PC is inside a dynamically generated sigtramp handler,
-         create and push a procedure descriptor for that code: */
-      offset = alpha_dynamic_sigtramp_offset (pc);
-      if (offset >= 0)
-       return push_sigtramp_desc (pc - offset);
-
-      /* If heuristic_fence_post is non-zero, determine the procedure
-         start address by examining the instructions.
-         This allows us to find the start address of static functions which
-         have no symbolic information, as startaddr would have been set to
-         the preceding global function start address by the
-         find_pc_partial_function call above.  */
-      if (startaddr == 0 || heuristic_fence_post != 0)
-       startaddr = heuristic_proc_start (pc);
-
-      proc_desc =
-       heuristic_proc_desc (startaddr, pc, next_frame);
-    }
-  return proc_desc;

 }
 
 }
 

-alpha_extra_func_info_t cached_proc_desc;
+static int
+alpha_use_struct_convention (int gcc_p, struct type *type)
+{
+  /* Structures are returned by ref in extra arg0.  */
+  return 1;
+}

 
 

-static CORE_ADDR
-alpha_frame_chain (struct frame_info *frame)
+\f
+static const unsigned char *
+alpha_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)

 {
 {

-  alpha_extra_func_info_t proc_desc;
-  CORE_ADDR saved_pc = FRAME_SAVED_PC (frame);
+  static const unsigned char alpha_breakpoint[] =
+    { 0x80, 0, 0, 0 }; /* call_pal bpt */

 
 

-  if (saved_pc == 0 || inside_entry_file (saved_pc))
-    return 0;
+  *lenptr = sizeof(alpha_breakpoint);
+  return (alpha_breakpoint);
+}
+
+\f
+/* This returns the PC of the first insn after the prologue.
+   If we can't find the prologue, then return 0.  */
+
+CORE_ADDR
+alpha_after_prologue (CORE_ADDR pc)
+{
+  struct symtab_and_line sal;
+  CORE_ADDR func_addr, func_end;

 
 

-  proc_desc = find_proc_desc (saved_pc, frame);
-  if (!proc_desc)
+  if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))

     return 0;
 
     return 0;
 

-  cached_proc_desc = proc_desc;
-
-  /* Fetch the frame pointer for a dummy frame from the procedure
-     descriptor.  */
-  if (PROC_DESC_IS_DUMMY (proc_desc))
-    return (CORE_ADDR) PROC_DUMMY_FRAME (proc_desc);
-
-  /* If no frame pointer and frame size is zero, we must be at end
-     of stack (or otherwise hosed).  If we don't check frame size,
-     we loop forever if we see a zero size frame.  */
-  if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
-      && PROC_FRAME_OFFSET (proc_desc) == 0
-  /* The previous frame from a sigtramp frame might be frameless
-     and have frame size zero.  */
-      && !(get_frame_type (frame) == SIGTRAMP_FRAME))
-    return alpha_frame_past_sigtramp_frame (frame, saved_pc);
-  else
-    return read_next_frame_reg (frame, PROC_FRAME_REG (proc_desc))
-      + PROC_FRAME_OFFSET (proc_desc);
+  sal = find_pc_line (func_addr, 0);
+  if (sal.end < func_end)
+    return sal.end;
+
+  /* The line after the prologue is after the end of the function.  In this
+     case, tell the caller to find the prologue the hard way.  */
+  return 0;

 }
 
 }
 

-void
-alpha_print_extra_frame_info (struct frame_info *fi)
+/* Read an instruction from memory at PC, looking through breakpoints.  */
+
+unsigned int
+alpha_read_insn (CORE_ADDR pc)

 {
 {

-  if (fi
-      && get_frame_extra_info (fi)
-      && get_frame_extra_info (fi)->proc_desc
-      && get_frame_extra_info (fi)->proc_desc->pdr.framereg < NUM_REGS)
-    printf_filtered (" frame pointer is at %s+%s\n",
-                    REGISTER_NAME (get_frame_extra_info (fi)->proc_desc->pdr.framereg),
-                    paddr_d (get_frame_extra_info (fi)->proc_desc->pdr.frameoffset));
+  char buf[4];
+  int status;
+
+  status = read_memory_nobpt (pc, buf, 4);
+  if (status)
+    memory_error (status, pc);
+  return extract_unsigned_integer (buf, 4);

 }
 
 }
 

-static void
-alpha_init_extra_frame_info (int fromleaf, struct frame_info *frame)
+/* To skip prologues, I use this predicate.  Returns either PC itself
+   if the code at PC does not look like a function prologue; otherwise
+   returns an address that (if we're lucky) follows the prologue.  If
+   LENIENT, then we must skip everything which is involved in setting
+   up the frame (it's OK to skip more, just so long as we don't skip
+   anything which might clobber the registers which are being saved.  */
+
+static CORE_ADDR
+alpha_skip_prologue (CORE_ADDR pc)

 {
 {

-  /* Use proc_desc calculated in frame_chain */
-  alpha_extra_func_info_t proc_desc =
-    get_next_frame (frame)
-    ? cached_proc_desc
-    : find_proc_desc (get_frame_pc (frame), get_next_frame (frame));
-
-  frame_extra_info_zalloc (frame, sizeof (struct frame_extra_info));
-
-  /* NOTE: cagney/2003-01-03: No need to set saved_regs to NULL,
-     always NULL by default.  */
-  /* frame->saved_regs = NULL; */
-  get_frame_extra_info (frame)->localoff = 0;
-  get_frame_extra_info (frame)->pc_reg = ALPHA_RA_REGNUM;
-  get_frame_extra_info (frame)->proc_desc = proc_desc == &temp_proc_desc ? 0 : proc_desc;
-  if (proc_desc)
+  unsigned long inst;
+  int offset;
+  CORE_ADDR post_prologue_pc;
+  char buf[4];
+
+  /* Silently return the unaltered pc upon memory errors.
+     This could happen on OSF/1 if decode_line_1 tries to skip the
+     prologue for quickstarted shared library functions when the
+     shared library is not yet mapped in.
+     Reading target memory is slow over serial lines, so we perform
+     this check only if the target has shared libraries (which all
+     Alpha targets do).  */
+  if (target_read_memory (pc, buf, 4))
+    return pc;
+
+  /* See if we can determine the end of the prologue via the symbol table.
+     If so, then return either PC, or the PC after the prologue, whichever
+     is greater.  */
+
+  post_prologue_pc = alpha_after_prologue (pc);
+  if (post_prologue_pc != 0)
+    return max (pc, post_prologue_pc);
+
+  /* Can't determine prologue from the symbol table, need to examine
+     instructions.  */
+
+  /* Skip the typical prologue instructions. These are the stack adjustment
+     instruction and the instructions that save registers on the stack
+     or in the gcc frame.  */
+  for (offset = 0; offset < 100; offset += 4)

     {
     {

-      /* Get the locals offset and the saved pc register from the
-         procedure descriptor, they are valid even if we are in the
-         middle of the prologue.  */
-      get_frame_extra_info (frame)->localoff = PROC_LOCALOFF (proc_desc);
-      get_frame_extra_info (frame)->pc_reg = PROC_PC_REG (proc_desc);
-
-      /* Fixup frame-pointer - only needed for top frame */
-
-      /* Fetch the frame pointer for a dummy frame from the procedure
-         descriptor.  */
-      if (PROC_DESC_IS_DUMMY (proc_desc))
-       deprecated_update_frame_base_hack (frame, (CORE_ADDR) PROC_DUMMY_FRAME (proc_desc));
-
-      /* This may not be quite right, if proc has a real frame register.
-         Get the value of the frame relative sp, procedure might have been
-         interrupted by a signal at it's very start.  */
-      else if (get_frame_pc (frame) == PROC_LOW_ADDR (proc_desc)
-              && !alpha_proc_desc_is_dyn_sigtramp (proc_desc))
-       deprecated_update_frame_base_hack (frame, read_next_frame_reg (get_next_frame (frame), SP_REGNUM));
-      else
-       deprecated_update_frame_base_hack (frame, read_next_frame_reg (get_next_frame (frame), PROC_FRAME_REG (proc_desc))
-                                          + PROC_FRAME_OFFSET (proc_desc));
+      inst = alpha_read_insn (pc + offset);

 
 

-      if (proc_desc == &temp_proc_desc)
-       {
-         char *name;
-
-         /* Do not set the saved registers for a sigtramp frame,
-            alpha_find_saved_registers will do that for us.  We can't
-            use (get_frame_type (frame) == SIGTRAMP_FRAME), it is not
-            yet set.  */
-         /* FIXME: cagney/2002-11-18: This problem will go away once
-             frame.c:get_prev_frame() is modified to set the frame's
-             type before calling functions like this.  */
-         find_pc_partial_function (get_frame_pc (frame), &name,
-                                   (CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
-         if (!PC_IN_SIGTRAMP (get_frame_pc (frame), name))
-           {
-             frame_saved_regs_zalloc (frame);
-             memcpy (get_frame_saved_regs (frame), temp_saved_regs,
-                     SIZEOF_FRAME_SAVED_REGS);
-             get_frame_saved_regs (frame)[PC_REGNUM]
-               = get_frame_saved_regs (frame)[ALPHA_RA_REGNUM];
-           }
-       }
+      if ((inst & 0xffff0000) == 0x27bb0000)   /* ldah $gp,n($t12) */
+       continue;
+      if ((inst & 0xffff0000) == 0x23bd0000)   /* lda $gp,n($gp) */
+       continue;
+      if ((inst & 0xffff0000) == 0x23de0000)   /* lda $sp,n($sp) */
+       continue;
+      if ((inst & 0xffe01fff) == 0x43c0153e)   /* subq $sp,n,$sp */
+       continue;
+
+      if (((inst & 0xfc1f0000) == 0xb41e0000           /* stq reg,n($sp) */
+          || (inst & 0xfc1f0000) == 0x9c1e0000)        /* stt reg,n($sp) */
+         && (inst & 0x03e00000) != 0x03e00000)         /* reg != $zero */
+       continue;
+
+      if (inst == 0x47de040f)                  /* bis sp,sp,fp */
+       continue;
+      if (inst == 0x47fe040f)                  /* bis zero,sp,fp */
+       continue;
+
+      break;

     }
     }

+  return pc + offset;

 }
 
 }
 

-static CORE_ADDR
-alpha_frame_locals_address (struct frame_info *fi)
+\f
+/* Figure out where the longjmp will land.
+   We expect the first arg to be a pointer to the jmp_buf structure from
+   which we extract the PC (JB_PC) that we will land at.  The PC is copied
+   into the "pc".  This routine returns true on success.  */
+
+static int
+alpha_get_longjmp_target (CORE_ADDR *pc)

 {
 {

-  return (get_frame_base (fi) - get_frame_extra_info (fi)->localoff);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+  CORE_ADDR jb_addr;
+  char raw_buffer[ALPHA_REGISTER_SIZE];
+
+  jb_addr = read_register (ALPHA_A0_REGNUM);
+
+  if (target_read_memory (jb_addr + (tdep->jb_pc * tdep->jb_elt_size),
+                         raw_buffer, tdep->jb_elt_size))
+    return 0;
+
+  *pc = extract_unsigned_integer (raw_buffer, tdep->jb_elt_size);
+  return 1;

 }
 
 }
 

-static CORE_ADDR
-alpha_frame_args_address (struct frame_info *fi)
+\f
+/* Frame unwinder for signal trampolines.  We use alpha tdep bits that
+   describe the location and shape of the sigcontext structure.  After
+   that, all registers are in memory, so it's easy.  */
+/* ??? Shouldn't we be able to do this generically, rather than with
+   OSABI data specific to Alpha?  */
+
+struct alpha_sigtramp_unwind_cache

 {
 {

-  return (get_frame_base (fi) - (ALPHA_NUM_ARG_REGS * 8));
-}
+  CORE_ADDR sigcontext_addr;
+};

 
 

-/* ALPHA stack frames are almost impenetrable.  When execution stops,
-   we basically have to look at symbol information for the function
-   that we stopped in, which tells us *which* register (if any) is
-   the base of the frame pointer, and what offset from that register
-   the frame itself is at.  
+static struct alpha_sigtramp_unwind_cache *
+alpha_sigtramp_frame_unwind_cache (struct frame_info *next_frame,
+                                  void **this_prologue_cache)
+{
+  struct alpha_sigtramp_unwind_cache *info;
+  struct gdbarch_tdep *tdep;

 
 

-   This presents a problem when trying to examine a stack in memory
-   (that isn't executing at the moment), using the "frame" command.  We
-   don't have a PC, nor do we have any registers except SP.
+  if (*this_prologue_cache)
+    return *this_prologue_cache;

 
 

-   This routine takes two arguments, SP and PC, and tries to make the
-   cached frames look as if these two arguments defined a frame on the
-   cache.  This allows the rest of info frame to extract the important
-   arguments without difficulty.  */
+  info = FRAME_OBSTACK_ZALLOC (struct alpha_sigtramp_unwind_cache);
+  *this_prologue_cache = info;

 
 

-struct frame_info *
-alpha_setup_arbitrary_frame (int argc, CORE_ADDR *argv)
-{
-  if (argc != 2)
-    error ("ALPHA frame specifications require two arguments: sp and pc");
+  tdep = gdbarch_tdep (current_gdbarch);
+  info->sigcontext_addr = tdep->sigcontext_addr (next_frame);

 
 

-  return create_new_frame (argv[0], argv[1]);
+  return info;

 }
 
 }
 

-/* The alpha passes the first six arguments in the registers, the rest on
-   the stack. The register arguments are eventually transferred to the
-   argument transfer area immediately below the stack by the called function
-   anyway. So we `push' at least six arguments on the stack, `reload' the
-   argument registers and then adjust the stack pointer to point past the
-   sixth argument. This algorithm simplifies the passing of a large struct
-   which extends from the registers to the stack.
-   If the called function is returning a structure, the address of the
-   structure to be returned is passed as a hidden first argument.  */
+/* Return the address of REGNO in a sigtramp frame.  Since this is all
+   arithmetic, it doesn't seem worthwhile to cache it.  */
+
+#ifndef SIGFRAME_PC_OFF
+#define SIGFRAME_PC_OFF                (2 * 8)
+#define SIGFRAME_REGSAVE_OFF   (4 * 8)
+#define SIGFRAME_FPREGSAVE_OFF (SIGFRAME_REGSAVE_OFF + 32 * 8 + 8)
+#endif

 
 static CORE_ADDR
 
 static CORE_ADDR

-alpha_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
-                     int struct_return, CORE_ADDR struct_addr)
+alpha_sigtramp_register_address (CORE_ADDR sigcontext_addr, unsigned int regno)
+{ 
+  if (regno < 32)
+    return sigcontext_addr + SIGFRAME_REGSAVE_OFF + regno * 8;
+  if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32)
+    return sigcontext_addr + SIGFRAME_FPREGSAVE_OFF + regno * 8;
+  if (regno == PC_REGNUM)
+    return sigcontext_addr + SIGFRAME_PC_OFF; 
+
+  return 0;
+}
+
+/* Given a GDB frame, determine the address of the calling function's
+   frame.  This will be used to create a new GDB frame struct.  */
+
+static void
+alpha_sigtramp_frame_this_id (struct frame_info *next_frame,
+                             void **this_prologue_cache,
+                             struct frame_id *this_id)

 {
 {

-  int i;
-  int accumulate_size = struct_return ? 8 : 0;
-  int arg_regs_size = ALPHA_NUM_ARG_REGS * 8;
-  struct alpha_arg
+  struct alpha_sigtramp_unwind_cache *info
+    = alpha_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
+  struct gdbarch_tdep *tdep;
+  CORE_ADDR stack_addr, code_addr;
+
+  /* If the OSABI couldn't locate the sigcontext, give up.  */
+  if (info->sigcontext_addr == 0)
+    return;
+
+  /* If we have dynamic signal trampolines, find their start.
+     If we do not, then we must assume there is a symbol record
+     that can provide the start address.  */
+  tdep = gdbarch_tdep (current_gdbarch);
+  if (tdep->dynamic_sigtramp_offset)

     {
     {

-      char *contents;
-      int len;

       int offset;
       int offset;

-    };
-  struct alpha_arg *alpha_args =
-  (struct alpha_arg *) alloca (nargs * sizeof (struct alpha_arg));
-  register struct alpha_arg *m_arg;
-  char raw_buffer[sizeof (CORE_ADDR)];
-  int required_arg_regs;
+      code_addr = frame_pc_unwind (next_frame);
+      offset = tdep->dynamic_sigtramp_offset (code_addr);
+      if (offset >= 0)
+       code_addr -= offset;
+      else
+       code_addr = 0;
+    }
+  else
+    code_addr = frame_func_unwind (next_frame);

 
 

-  for (i = 0, m_arg = alpha_args; i < nargs; i++, m_arg++)
+  /* The stack address is trivially read from the sigcontext.  */
+  stack_addr = alpha_sigtramp_register_address (info->sigcontext_addr,
+                                               ALPHA_SP_REGNUM);
+  stack_addr = read_memory_unsigned_integer (stack_addr, ALPHA_REGISTER_SIZE);
+
+  *this_id = frame_id_build (stack_addr, code_addr);
+}
+
+/* Retrieve the value of REGNUM in FRAME.  Don't give up!  */
+
+static void
+alpha_sigtramp_frame_prev_register (struct frame_info *next_frame,
+                                   void **this_prologue_cache,
+                                   int regnum, int *optimizedp,
+                                   enum lval_type *lvalp, CORE_ADDR *addrp,
+                                   int *realnump, void *bufferp)
+{
+  struct alpha_sigtramp_unwind_cache *info
+    = alpha_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
+  CORE_ADDR addr;
+
+  if (info->sigcontext_addr != 0)

     {
     {

-      struct value *arg = args[i];
-      struct type *arg_type = check_typedef (VALUE_TYPE (arg));
-      /* Cast argument to long if necessary as the compiler does it too.  */
-      switch (TYPE_CODE (arg_type))
+      /* All integer and fp registers are stored in memory.  */
+      addr = alpha_sigtramp_register_address (info->sigcontext_addr, regnum);
+      if (addr != 0)

        {
        {

-       case TYPE_CODE_INT:
-       case TYPE_CODE_BOOL:
-       case TYPE_CODE_CHAR:
-       case TYPE_CODE_RANGE:
-       case TYPE_CODE_ENUM:
-         if (TYPE_LENGTH (arg_type) < TYPE_LENGTH (builtin_type_long))
-           {
-             arg_type = builtin_type_long;
-             arg = value_cast (arg_type, arg);
-           }
-         break;
-       default:
-         break;
+         *optimizedp = 0;
+         *lvalp = lval_memory;
+         *addrp = addr;
+         *realnump = -1;
+         if (bufferp != NULL)
+           read_memory (addr, bufferp, ALPHA_REGISTER_SIZE);
+         return;

        }
        }

-      m_arg->len = TYPE_LENGTH (arg_type);
-      m_arg->offset = accumulate_size;
-      accumulate_size = (accumulate_size + m_arg->len + 7) & ~7;
-      m_arg->contents = VALUE_CONTENTS (arg);

     }
 
     }
 

-  /* Determine required argument register loads, loading an argument register
-     is expensive as it uses three ptrace calls.  */
-  required_arg_regs = accumulate_size / 8;
-  if (required_arg_regs > ALPHA_NUM_ARG_REGS)
-    required_arg_regs = ALPHA_NUM_ARG_REGS;
-
-  /* Make room for the arguments on the stack.  */
-  if (accumulate_size < arg_regs_size)
-    accumulate_size = arg_regs_size;
-  sp -= accumulate_size;
+  /* This extra register may actually be in the sigcontext, but our
+     current description of it in alpha_sigtramp_frame_unwind_cache
+     doesn't include it.  Too bad.  Fall back on whatever's in the
+     outer frame.  */
+  frame_register (next_frame, regnum, optimizedp, lvalp, addrp,
+                 realnump, bufferp);
+}

 
 

-  /* Keep sp aligned to a multiple of 16 as the compiler does it too.  */
-  sp &= ~15;
+static const struct frame_unwind alpha_sigtramp_frame_unwind = {
+  SIGTRAMP_FRAME,
+  alpha_sigtramp_frame_this_id,
+  alpha_sigtramp_frame_prev_register
+};

 
 

-  /* `Push' arguments on the stack.  */
-  for (i = nargs; m_arg--, --i >= 0;)
-    write_memory (sp + m_arg->offset, m_arg->contents, m_arg->len);
-  if (struct_return)
-    {
-      store_address (raw_buffer, sizeof (CORE_ADDR), struct_addr);
-      write_memory (sp, raw_buffer, sizeof (CORE_ADDR));
-    }
+static const struct frame_unwind *
+alpha_sigtramp_frame_p (CORE_ADDR pc)
+{
+  char *name;

 
 

-  /* Load the argument registers.  */
-  for (i = 0; i < required_arg_regs; i++)
-    {
-      LONGEST val;
+  /* We shouldn't even bother to try if the OSABI didn't register
+     a sigcontext_addr handler.  */
+  if (!gdbarch_tdep (current_gdbarch)->sigcontext_addr)
+    return NULL;

 
 

-      val = read_memory_integer (sp + i * 8, 8);
-      write_register (ALPHA_A0_REGNUM + i, val);
-      write_register (ALPHA_FPA0_REGNUM + i, val);
-    }
+  /* Otherwise we should be in a signal frame.  */
+  find_pc_partial_function (pc, &name, NULL, NULL);
+  if (PC_IN_SIGTRAMP (pc, name))
+    return &alpha_sigtramp_frame_unwind;

 
 

-  return sp + arg_regs_size;
+  return NULL;

 }
 }

+\f
+/* Fallback alpha frame unwinder.  Uses instruction scanning and knows
+   something about the traditional layout of alpha stack frames.  */

 
 

-static void
-alpha_push_dummy_frame (void)
+struct alpha_heuristic_unwind_cache

 {
 {

-  int ireg;
-  struct linked_proc_info *link;
-  alpha_extra_func_info_t proc_desc;
-  CORE_ADDR sp = read_register (SP_REGNUM);
-  CORE_ADDR save_address;
-  char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE];
-  unsigned long mask;
-
-  link = (struct linked_proc_info *) xmalloc (sizeof (struct linked_proc_info));
-  link->next = linked_proc_desc_table;
-  linked_proc_desc_table = link;
-
-  proc_desc = &link->info;
-
-  /*
-   * The registers we must save are all those not preserved across
-   * procedure calls.
-   * In addition, we must save the PC and RA.
-   *
-   * Dummy frame layout:
-   *  (high memory)
-   *    Saved PC
-   *    Saved F30
-   *    ...
-   *    Saved F0
-   *    Saved R29
-   *    ...
-   *    Saved R0
-   *    Saved R26 (RA)
-   *    Parameter build area
-   *  (low memory)
-   */
-
-/* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */
-#define MASK(i,j) ((((LONGEST)1 << ((j)+1)) - 1) ^ (((LONGEST)1 << (i)) - 1))
-#define GEN_REG_SAVE_MASK (MASK(0,8) | MASK(16,29))
-#define GEN_REG_SAVE_COUNT 24
-#define FLOAT_REG_SAVE_MASK (MASK(0,1) | MASK(10,30))
-#define FLOAT_REG_SAVE_COUNT 23
-  /* The special register is the PC as we have no bit for it in the save masks.
-     alpha_frame_saved_pc knows where the pc is saved in a dummy frame.  */
-#define SPECIAL_REG_SAVE_COUNT 1
-
-  PROC_REG_MASK (proc_desc) = GEN_REG_SAVE_MASK;
-  PROC_FREG_MASK (proc_desc) = FLOAT_REG_SAVE_MASK;
-  /* PROC_REG_OFFSET is the offset from the dummy frame to the saved RA,
-     but keep SP aligned to a multiple of 16.  */
-  PROC_REG_OFFSET (proc_desc) =
-    -((8 * (SPECIAL_REG_SAVE_COUNT
-           + GEN_REG_SAVE_COUNT
-           + FLOAT_REG_SAVE_COUNT)
-       + 15) & ~15);
-  PROC_FREG_OFFSET (proc_desc) =
-    PROC_REG_OFFSET (proc_desc) + 8 * GEN_REG_SAVE_COUNT;
-
-  /* Save general registers.
-     The return address register is the first saved register, all other
-     registers follow in ascending order.
-     The PC is saved immediately below the SP.  */
-  save_address = sp + PROC_REG_OFFSET (proc_desc);
-  store_address (raw_buffer, 8, read_register (ALPHA_RA_REGNUM));
-  write_memory (save_address, raw_buffer, 8);
-  save_address += 8;
-  mask = PROC_REG_MASK (proc_desc) & 0xffffffffL;
-  for (ireg = 0; mask; ireg++, mask >>= 1)
-    if (mask & 1)
-      {
-       if (ireg == ALPHA_RA_REGNUM)
-         continue;
-       store_address (raw_buffer, 8, read_register (ireg));
-       write_memory (save_address, raw_buffer, 8);
-       save_address += 8;
-      }
-
-  store_address (raw_buffer, 8, read_register (PC_REGNUM));
-  write_memory (sp - 8, raw_buffer, 8);
-
-  /* Save floating point registers.  */
-  save_address = sp + PROC_FREG_OFFSET (proc_desc);
-  mask = PROC_FREG_MASK (proc_desc) & 0xffffffffL;
-  for (ireg = 0; mask; ireg++, mask >>= 1)
-    if (mask & 1)
-      {
-       store_address (raw_buffer, 8, read_register (ireg + FP0_REGNUM));
-       write_memory (save_address, raw_buffer, 8);
-       save_address += 8;
-      }
-
-  /* Set and save the frame address for the dummy.  
-     This is tricky. The only registers that are suitable for a frame save
-     are those that are preserved across procedure calls (s0-s6). But if
-     a read system call is interrupted and then a dummy call is made
-     (see testsuite/gdb.t17/interrupt.exp) the dummy call hangs till the read
-     is satisfied. Then it returns with the s0-s6 registers set to the values
-     on entry to the read system call and our dummy frame pointer would be
-     destroyed. So we save the dummy frame in the proc_desc and handle the
-     retrieval of the frame pointer of a dummy specifically. The frame register
-     is set to the virtual frame (pseudo) register, it's value will always
-     be read as zero and will help us to catch any errors in the dummy frame
-     retrieval code.  */
-  PROC_DUMMY_FRAME (proc_desc) = sp;
-  PROC_FRAME_REG (proc_desc) = FP_REGNUM;
-  PROC_FRAME_OFFSET (proc_desc) = 0;
-  sp += PROC_REG_OFFSET (proc_desc);
-  write_register (SP_REGNUM, sp);
-
-  PROC_LOW_ADDR (proc_desc) = CALL_DUMMY_ADDRESS ();
-  PROC_HIGH_ADDR (proc_desc) = PROC_LOW_ADDR (proc_desc) + 4;
-
-  SET_PROC_DESC_IS_DUMMY (proc_desc);
-  PROC_PC_REG (proc_desc) = ALPHA_RA_REGNUM;
-}
+  CORE_ADDR *saved_regs;
+  CORE_ADDR vfp;
+  CORE_ADDR start_pc;
+  int return_reg;
+};

 
 

-static void
-alpha_pop_frame (void)
+/* Heuristic_proc_start may hunt through the text section for a long
+   time across a 2400 baud serial line.  Allows the user to limit this
+   search.  */
+static unsigned int heuristic_fence_post = 0;
+
+/* Attempt to locate the start of the function containing PC.  We assume that
+   the previous function ends with an about_to_return insn.  Not foolproof by
+   any means, since gcc is happy to put the epilogue in the middle of a
+   function.  But we're guessing anyway...  */
+
+static CORE_ADDR
+alpha_heuristic_proc_start (CORE_ADDR pc)

 {
 {

-  register int regnum;
-  struct frame_info *frame = get_current_frame ();
-  CORE_ADDR new_sp = get_frame_base (frame);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+  CORE_ADDR last_non_nop = pc;
+  CORE_ADDR fence = pc - heuristic_fence_post;
+  CORE_ADDR orig_pc = pc;
+  CORE_ADDR func;

 
 

-  alpha_extra_func_info_t proc_desc = get_frame_extra_info (frame)->proc_desc;
+  if (pc == 0)
+    return 0;

 
 

-  /* we need proc_desc to know how to restore the registers;
-     if it is NULL, construct (a temporary) one */
-  if (proc_desc == NULL)
-    proc_desc = find_proc_desc (get_frame_pc (frame), get_next_frame (frame));
+  /* First see if we can find the start of the function from minimal
+     symbol information.  This can succeed with a binary that doesn't
+     have debug info, but hasn't been stripped.  */
+  func = get_pc_function_start (pc);
+  if (func)
+    return func;

 
 

-  /* Question: should we copy this proc_desc and save it in
-     frame->proc_desc?  If we do, who will free it?
-     For now, we don't save a copy... */
+  if (heuristic_fence_post == UINT_MAX
+      || fence < tdep->vm_min_address)
+    fence = tdep->vm_min_address;

 
 

-  write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
-  if (get_frame_saved_regs (frame) == NULL)
-    alpha_find_saved_regs (frame);
-  if (proc_desc)
+  /* Search back for previous return; also stop at a 0, which might be
+     seen for instance before the start of a code section.  Don't include
+     nops, since this usually indicates padding between functions.  */
+  for (pc -= 4; pc >= fence; pc -= 4)

     {
     {

-      for (regnum = 32; --regnum >= 0;)
-       if (PROC_REG_MASK (proc_desc) & (1 << regnum))
-         write_register (regnum,
-                         read_memory_integer (get_frame_saved_regs (frame)[regnum],
-                                              8));
-      for (regnum = 32; --regnum >= 0;)
-       if (PROC_FREG_MASK (proc_desc) & (1 << regnum))
-         write_register (regnum + FP0_REGNUM,
-          read_memory_integer (get_frame_saved_regs (frame)[regnum + FP0_REGNUM], 8));
-    }
-  write_register (SP_REGNUM, new_sp);
-  flush_cached_frames ();
+      unsigned int insn = alpha_read_insn (pc);
+      switch (insn)
+       {
+       case 0:                 /* invalid insn */
+       case 0x6bfa8001:        /* ret $31,($26),1 */
+         return last_non_nop;

 
 

-  if (proc_desc && (PROC_DESC_IS_DUMMY (proc_desc)
-                   || alpha_proc_desc_is_dyn_sigtramp (proc_desc)))
-    {
-      struct linked_proc_info *pi_ptr, *prev_ptr;
+       case 0x2ffe0000:        /* unop: ldq_u $31,0($30) */
+       case 0x47ff041f:        /* nop: bis $31,$31,$31 */
+         break;

 
 

-      for (pi_ptr = linked_proc_desc_table, prev_ptr = NULL;
-          pi_ptr != NULL;
-          prev_ptr = pi_ptr, pi_ptr = pi_ptr->next)
-       {
-         if (&pi_ptr->info == proc_desc)
-           break;
+       default:
+         last_non_nop = pc;
+         break;

        }
        }

+    }

 
 

-      if (pi_ptr == NULL)
-       error ("Can't locate dummy extra frame info\n");
+  /* It's not clear to me why we reach this point when stopping quietly,
+     but with this test, at least we don't print out warnings for every
+     child forked (eg, on decstation).  22apr93 rich@cygnus.com.  */
+  if (stop_soon == NO_STOP_QUIETLY)
+    {
+      static int blurb_printed = 0;

 
 

-      if (prev_ptr != NULL)
-       prev_ptr->next = pi_ptr->next;
+      if (fence == tdep->vm_min_address)
+       warning ("Hit beginning of text section without finding");

       else
       else

-       linked_proc_desc_table = pi_ptr->next;
+       warning ("Hit heuristic-fence-post without finding");
+      warning ("enclosing function for address 0x%s", paddr_nz (orig_pc));

 
 

-      xfree (pi_ptr);
+      if (!blurb_printed)
+       {
+         printf_filtered ("\
+This warning occurs if you are debugging a function without any symbols\n\
+(for example, in a stripped executable).  In that case, you may wish to\n\
+increase the size of the search with the `set heuristic-fence-post' command.\n\
+\n\
+Otherwise, you told GDB there was a function where there isn't one, or\n\
+(more likely) you have encountered a bug in GDB.\n");
+         blurb_printed = 1;
+       }

     }
     }

+
+  return 0;

 }
 }

-\f
-/* To skip prologues, I use this predicate.  Returns either PC itself
-   if the code at PC does not look like a function prologue; otherwise
-   returns an address that (if we're lucky) follows the prologue.  If
-   LENIENT, then we must skip everything which is involved in setting
-   up the frame (it's OK to skip more, just so long as we don't skip
-   anything which might clobber the registers which are being saved.
-   Currently we must not skip more on the alpha, but we might need the
-   lenient stuff some day.  */

 
 

-static CORE_ADDR
-alpha_skip_prologue_internal (CORE_ADDR pc, int lenient)
+static struct alpha_heuristic_unwind_cache *
+alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame,
+                                   void **this_prologue_cache,
+                                   CORE_ADDR start_pc)

 {
 {

-  unsigned long inst;
-  int offset;
-  CORE_ADDR post_prologue_pc;
-  char buf[4];
-
-  /* Silently return the unaltered pc upon memory errors.
-     This could happen on OSF/1 if decode_line_1 tries to skip the
-     prologue for quickstarted shared library functions when the
-     shared library is not yet mapped in.
-     Reading target memory is slow over serial lines, so we perform
-     this check only if the target has shared libraries (which all
-     Alpha targets do).  */
-  if (target_read_memory (pc, buf, 4))
-    return pc;
+  struct alpha_heuristic_unwind_cache *info;
+  ULONGEST val;
+  CORE_ADDR limit_pc, cur_pc;
+  int frame_reg, frame_size, return_reg, reg;

 
 

-  /* See if we can determine the end of the prologue via the symbol table.
-     If so, then return either PC, or the PC after the prologue, whichever
-     is greater.  */
+  if (*this_prologue_cache)
+    return *this_prologue_cache;

 
 

-  post_prologue_pc = after_prologue (pc, NULL);
+  info = FRAME_OBSTACK_ZALLOC (struct alpha_heuristic_unwind_cache);
+  *this_prologue_cache = info;
+  info->saved_regs = frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS);

 
 

-  if (post_prologue_pc != 0)
-    return max (pc, post_prologue_pc);
+  limit_pc = frame_pc_unwind (next_frame);
+  if (start_pc == 0)
+    start_pc = alpha_heuristic_proc_start (limit_pc);
+  info->start_pc = start_pc;

 
 

-  /* Can't determine prologue from the symbol table, need to examine
-     instructions.  */
+  frame_reg = ALPHA_SP_REGNUM;
+  frame_size = 0;
+  return_reg = -1;

 
 

-  /* Skip the typical prologue instructions. These are the stack adjustment
-     instruction and the instructions that save registers on the stack
-     or in the gcc frame.  */
-  for (offset = 0; offset < 100; offset += 4)
+  /* If we've identified a likely place to start, do code scanning.  */
+  if (start_pc != 0)

     {
     {

-      int status;
+      /* Limit the forward search to 50 instructions.  */
+      if (start_pc + 200 < limit_pc)
+       limit_pc = start_pc + 200;

 
 

-      status = read_memory_nobpt (pc + offset, buf, 4);
-      if (status)
-       memory_error (status, pc + offset);
-      inst = extract_unsigned_integer (buf, 4);
+      for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4)
+       {
+         unsigned int word = alpha_read_insn (cur_pc);

 
 

-      /* The alpha has no delay slots. But let's keep the lenient stuff,
-         we might need it for something else in the future.  */
-      if (lenient && 0)
-       continue;
+         if ((word & 0xffff0000) == 0x23de0000)        /* lda $sp,n($sp) */
+           {
+             if (word & 0x8000)
+               {
+                 /* Consider only the first stack allocation instruction
+                    to contain the static size of the frame. */
+                 if (frame_size == 0)
+                   frame_size = (-word) & 0xffff;
+               }
+             else
+               {
+                 /* Exit loop if a positive stack adjustment is found, which
+                    usually means that the stack cleanup code in the function
+                    epilogue is reached.  */
+                 break;
+               }
+           }
+         else if ((word & 0xfc1f0000) == 0xb41e0000)   /* stq reg,n($sp) */
+           {
+             reg = (word & 0x03e00000) >> 21;
+
+             if (reg == 31)
+               continue;
+
+             /* Do not compute the address where the register was saved yet,
+                because we don't know yet if the offset will need to be
+                relative to $sp or $fp (we can not compute the address
+                relative to $sp if $sp is updated during the execution of
+                the current subroutine, for instance when doing some alloca).
+                So just store the offset for the moment, and compute the
+                address later when we know whether this frame has a frame
+                pointer or not.  */
+             /* Hack: temporarily add one, so that the offset is non-zero
+                and we can tell which registers have save offsets below.  */
+             info->saved_regs[reg] = (word & 0xffff) + 1;
+
+             /* Starting with OSF/1-3.2C, the system libraries are shipped
+                without local symbols, but they still contain procedure
+                descriptors without a symbol reference. GDB is currently
+                unable to find these procedure descriptors and uses
+                heuristic_proc_desc instead.
+                As some low level compiler support routines (__div*, __add*)
+                use a non-standard return address register, we have to
+                add some heuristics to determine the return address register,
+                or stepping over these routines will fail.
+                Usually the return address register is the first register
+                saved on the stack, but assembler optimization might
+                rearrange the register saves.
+                So we recognize only a few registers (t7, t9, ra) within
+                the procedure prologue as valid return address registers.
+                If we encounter a return instruction, we extract the
+                the return address register from it.
+
+                FIXME: Rewriting GDB to access the procedure descriptors,
+                e.g. via the minimal symbol table, might obviate this hack.  */
+             if (return_reg == -1
+                 && cur_pc < (start_pc + 80)
+                 && (reg == ALPHA_T7_REGNUM
+                     || reg == ALPHA_T9_REGNUM
+                     || reg == ALPHA_RA_REGNUM))
+               return_reg = reg;
+           }
+         else if ((word & 0xffe0ffff) == 0x6be08001)   /* ret zero,reg,1 */
+           return_reg = (word >> 16) & 0x1f;
+         else if (word == 0x47de040f)                  /* bis sp,sp,fp */
+           frame_reg = ALPHA_GCC_FP_REGNUM;
+         else if (word == 0x47fe040f)                  /* bis zero,sp,fp */
+           frame_reg = ALPHA_GCC_FP_REGNUM;
+       }

 
 

-      if ((inst & 0xffff0000) == 0x27bb0000)   /* ldah $gp,n($t12) */
-       continue;
-      if ((inst & 0xffff0000) == 0x23bd0000)   /* lda $gp,n($gp) */
-       continue;
-      if ((inst & 0xffff0000) == 0x23de0000)   /* lda $sp,n($sp) */
-       continue;
-      if ((inst & 0xffe01fff) == 0x43c0153e)   /* subq $sp,n,$sp */
-       continue;
+      /* If we haven't found a valid return address register yet, keep
+        searching in the procedure prologue.  */
+      if (return_reg == -1)
+       {
+         while (cur_pc < (limit_pc + 80) && cur_pc < (start_pc + 80))
+           {
+             unsigned int word = alpha_read_insn (cur_pc);

 
 

-      if ((inst & 0xfc1f0000) == 0xb41e0000
-         && (inst & 0xffff0000) != 0xb7fe0000)
-       continue;               /* stq reg,n($sp) */
-      /* reg != $zero */
-      if ((inst & 0xfc1f0000) == 0x9c1e0000
-         && (inst & 0xffff0000) != 0x9ffe0000)
-       continue;               /* stt reg,n($sp) */
-      /* reg != $zero */
-      if (inst == 0x47de040f)  /* bis sp,sp,fp */
-       continue;
+             if ((word & 0xfc1f0000) == 0xb41e0000)    /* stq reg,n($sp) */
+               {
+                 reg = (word & 0x03e00000) >> 21;
+                 if (reg == ALPHA_T7_REGNUM
+                     || reg == ALPHA_T9_REGNUM
+                     || reg == ALPHA_RA_REGNUM)
+                   {
+                     return_reg = reg;
+                     break;
+                   }
+               }
+             else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
+               {
+                 return_reg = (word >> 16) & 0x1f;
+                 break;
+               }

 
 

-      break;
+             cur_pc += 4;
+           }
+       }

     }
     }

-  return pc + offset;
-}

 
 

-static CORE_ADDR
-alpha_skip_prologue (CORE_ADDR addr)
-{
-  return (alpha_skip_prologue_internal (addr, 0));
-}
+  /* Failing that, do default to the customary RA.  */
+  if (return_reg == -1)
+    return_reg = ALPHA_RA_REGNUM;
+  info->return_reg = return_reg;

 
 

-#if 0
-/* Is address PC in the prologue (loosely defined) for function at
-   STARTADDR?  */
+  frame_unwind_unsigned_register (next_frame, frame_reg, &val);
+  info->vfp = val + frame_size;

 
 

-static int
-alpha_in_lenient_prologue (CORE_ADDR startaddr, CORE_ADDR pc)
-{
-  CORE_ADDR end_prologue = alpha_skip_prologue_internal (startaddr, 1);
-  return pc >= startaddr && pc < end_prologue;
+  /* Convert offsets to absolute addresses.  See above about adding
+     one to the offsets to make all detected offsets non-zero.  */
+  for (reg = 0; reg < ALPHA_NUM_REGS; ++reg)
+    if (info->saved_regs[reg])
+      info->saved_regs[reg] += val - 1;
+
+  return info;

 }
 }

-#endif

 
 

-/* The alpha needs a conversion between register and memory format if
-   the register is a floating point register and
-   memory format is float, as the register format must be double
-   or
-   memory format is an integer with 4 bytes or less, as the representation
-   of integers in floating point registers is different. */
+/* Given a GDB frame, determine the address of the calling function's
+   frame.  This will be used to create a new GDB frame struct.  */
+

 static void
 static void

-alpha_register_convert_to_virtual (int regnum, struct type *valtype,
-                                  char *raw_buffer, char *virtual_buffer)
+alpha_heuristic_frame_this_id (struct frame_info *next_frame,
+                                void **this_prologue_cache,
+                                struct frame_id *this_id)

 {
 {

-  if (TYPE_LENGTH (valtype) >= REGISTER_RAW_SIZE (regnum))
-    {
-      memcpy (virtual_buffer, raw_buffer, REGISTER_VIRTUAL_SIZE (regnum));
-      return;
-    }
+  struct alpha_heuristic_unwind_cache *info
+    = alpha_heuristic_frame_unwind_cache (next_frame, this_prologue_cache, 0);

 
 

-  if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
-    {
-      double d = extract_floating (raw_buffer, REGISTER_RAW_SIZE (regnum));
-      store_floating (virtual_buffer, TYPE_LENGTH (valtype), d);
-    }
-  else if (TYPE_CODE (valtype) == TYPE_CODE_INT && TYPE_LENGTH (valtype) <= 4)
-    {
-      ULONGEST l;
-      l = extract_unsigned_integer (raw_buffer, REGISTER_RAW_SIZE (regnum));
-      l = ((l >> 32) & 0xc0000000) | ((l >> 29) & 0x3fffffff);
-      store_unsigned_integer (virtual_buffer, TYPE_LENGTH (valtype), l);
-    }
-  else
-    error ("Cannot retrieve value from floating point register");
+  /* This is meant to halt the backtrace at "_start".  Make sure we
+     don't halt it at a generic dummy frame. */
+  if (inside_entry_file (info->start_pc))
+    return;
+
+  *this_id = frame_id_build (info->vfp, info->start_pc);

 }
 
 }
 

+/* Retrieve the value of REGNUM in FRAME.  Don't give up!  */
+

 static void
 static void

-alpha_register_convert_to_raw (struct type *valtype, int regnum,
-                              char *virtual_buffer, char *raw_buffer)
+alpha_heuristic_frame_prev_register (struct frame_info *next_frame,
+                                    void **this_prologue_cache,
+                                    int regnum, int *optimizedp,
+                                    enum lval_type *lvalp, CORE_ADDR *addrp,
+                                    int *realnump, void *bufferp)

 {
 {

-  if (TYPE_LENGTH (valtype) >= REGISTER_RAW_SIZE (regnum))
+  struct alpha_heuristic_unwind_cache *info
+    = alpha_heuristic_frame_unwind_cache (next_frame, this_prologue_cache, 0);
+
+  /* The PC of the previous frame is stored in the link register of
+     the current frame.  Frob regnum so that we pull the value from
+     the correct place.  */
+  if (regnum == ALPHA_PC_REGNUM)
+    regnum = info->return_reg;
+  
+  /* For all registers known to be saved in the current frame, 
+     do the obvious and pull the value out.  */
+  if (info->saved_regs[regnum])

     {
     {

-      memcpy (raw_buffer, virtual_buffer, REGISTER_RAW_SIZE (regnum));
+      *optimizedp = 0;
+      *lvalp = lval_memory;
+      *addrp = info->saved_regs[regnum];
+      *realnump = -1;
+      if (bufferp != NULL)
+       read_memory (*addrp, bufferp, ALPHA_REGISTER_SIZE);

       return;
     }
 
       return;
     }
 

-  if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
-    {
-      double d = extract_floating (virtual_buffer, TYPE_LENGTH (valtype));
-      store_floating (raw_buffer, REGISTER_RAW_SIZE (regnum), d);
-    }
-  else if (TYPE_CODE (valtype) == TYPE_CODE_INT && TYPE_LENGTH (valtype) <= 4)
+  /* The stack pointer of the previous frame is computed by popping
+     the current stack frame.  */
+  if (regnum == ALPHA_SP_REGNUM)

     {
     {

-      ULONGEST l;
-      if (TYPE_UNSIGNED (valtype))
-       l = extract_unsigned_integer (virtual_buffer, TYPE_LENGTH (valtype));
-      else
-       l = extract_signed_integer (virtual_buffer, TYPE_LENGTH (valtype));
-      l = ((l & 0xc0000000) << 32) | ((l & 0x3fffffff) << 29);
-      store_unsigned_integer (raw_buffer, REGISTER_RAW_SIZE (regnum), l);
+      *optimizedp = 0;
+      *lvalp = not_lval;
+      *addrp = 0;
+      *realnump = -1;
+      if (bufferp != NULL)
+       store_unsigned_integer (bufferp, ALPHA_REGISTER_SIZE, info->vfp);
+      return;

     }
     }

-  else
-    error ("Cannot store value in floating point register");
-}
-
-static const unsigned char *
-alpha_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
-{
-  static const unsigned char alpha_breakpoint[] =
-    { 0x80, 0, 0, 0 }; /* call_pal bpt */

 
 

-  *lenptr = sizeof(alpha_breakpoint);
-  return (alpha_breakpoint);
+  /* Otherwise assume the next frame has the same register value.  */
+  frame_register (next_frame, regnum, optimizedp, lvalp, addrp,
+                 realnump, bufferp);

 }
 
 }
 

-/* Given a return value in `regbuf' with a type `valtype', 
-   extract and copy its value into `valbuf'.  */
+static const struct frame_unwind alpha_heuristic_frame_unwind = {
+  NORMAL_FRAME,
+  alpha_heuristic_frame_this_id,
+  alpha_heuristic_frame_prev_register
+};

 
 

-static void
-alpha_extract_return_value (struct type *valtype,
-                           char regbuf[ALPHA_REGISTER_BYTES], char *valbuf)
+static const struct frame_unwind *
+alpha_heuristic_frame_p (CORE_ADDR pc)

 {
 {

-  if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
-    alpha_register_convert_to_virtual (FP0_REGNUM, valtype,
-                                      regbuf + REGISTER_BYTE (FP0_REGNUM),
-                                      valbuf);
-  else
-    memcpy (valbuf, regbuf + REGISTER_BYTE (ALPHA_V0_REGNUM),
-            TYPE_LENGTH (valtype));
+  return &alpha_heuristic_frame_unwind;

 }
 
 }
 

-/* Given a return value in `regbuf' with a type `valtype', 
-   write its value into the appropriate register.  */
-
-static void
-alpha_store_return_value (struct type *valtype, char *valbuf)
+static CORE_ADDR
+alpha_heuristic_frame_base_address (struct frame_info *next_frame,
+                                   void **this_prologue_cache)

 {
 {

-  char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE];
-  int regnum = ALPHA_V0_REGNUM;
-  int length = TYPE_LENGTH (valtype);
-
-  if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
-    {
-      regnum = FP0_REGNUM;
-      length = REGISTER_RAW_SIZE (regnum);
-      alpha_register_convert_to_raw (valtype, regnum, valbuf, raw_buffer);
-    }
-  else
-    memcpy (raw_buffer, valbuf, length);
+  struct alpha_heuristic_unwind_cache *info
+    = alpha_heuristic_frame_unwind_cache (next_frame, this_prologue_cache, 0);

 
 

-  deprecated_write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, length);
+  return info->vfp;

 }
 
 }
 

+static const struct frame_base alpha_heuristic_frame_base = {
+  &alpha_heuristic_frame_unwind,
+  alpha_heuristic_frame_base_address,
+  alpha_heuristic_frame_base_address,
+  alpha_heuristic_frame_base_address
+};
+

 /* Just like reinit_frame_cache, but with the right arguments to be
 /* Just like reinit_frame_cache, but with the right arguments to be

-   callable as an sfunc.  */
+   callable as an sfunc.  Used by the "set heuristic-fence-post" command.  */

 
 static void
 reinit_frame_cache_sfunc (char *args, int from_tty, struct cmd_list_element *c)
 
 static void
 reinit_frame_cache_sfunc (char *args, int from_tty, struct cmd_list_element *c)


@@ -1566,90 +1213,120 @@ reinit_frame_cache_sfunc (char *args, int from_tty, struct cmd_list_element *c)
   reinit_frame_cache ();
 }
 
   reinit_frame_cache ();
 }
 

-/* This is the definition of CALL_DUMMY_ADDRESS.  It's a heuristic that is used
-   to find a convenient place in the text segment to stick a breakpoint to
-   detect the completion of a target function call (ala call_function_by_hand).
- */
-
-CORE_ADDR
-alpha_call_dummy_address (void)
-{
-  CORE_ADDR entry;
-  struct minimal_symbol *sym;
+\f
+/* ALPHA stack frames are almost impenetrable.  When execution stops,
+   we basically have to look at symbol information for the function
+   that we stopped in, which tells us *which* register (if any) is
+   the base of the frame pointer, and what offset from that register
+   the frame itself is at.  

 
 

-  entry = entry_point_address ();
+   This presents a problem when trying to examine a stack in memory
+   (that isn't executing at the moment), using the "frame" command.  We
+   don't have a PC, nor do we have any registers except SP.

 
 

-  if (entry != 0)
-    return entry;
+   This routine takes two arguments, SP and PC, and tries to make the
+   cached frames look as if these two arguments defined a frame on the
+   cache.  This allows the rest of info frame to extract the important
+   arguments without difficulty.  */

 
 

-  sym = lookup_minimal_symbol ("_Prelude", NULL, symfile_objfile);
+struct frame_info *
+alpha_setup_arbitrary_frame (int argc, CORE_ADDR *argv)
+{
+  if (argc != 2)
+    error ("ALPHA frame specifications require two arguments: sp and pc");

 
 

-  if (!sym || MSYMBOL_TYPE (sym) != mst_text)
-    return 0;
-  else
-    return SYMBOL_VALUE_ADDRESS (sym) + 4;
+  return create_new_frame (argv[0], argv[1]);

 }
 
 }
 

-static void
-alpha_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
-                      struct value **args, struct type *type, int gcc_p)
+/* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that
+   dummy frame.  The frame ID's base needs to match the TOS value
+   saved by save_dummy_frame_tos(), and the PC match the dummy frame's
+   breakpoint.  */
+
+static struct frame_id
+alpha_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)

 {
 {

-  CORE_ADDR bp_address = CALL_DUMMY_ADDRESS ();
+  ULONGEST base;
+  frame_unwind_unsigned_register (next_frame, ALPHA_SP_REGNUM, &base);
+  return frame_id_build (base, frame_pc_unwind (next_frame));
+}

 
 

-  if (bp_address == 0)
-    error ("no place to put call");
-  write_register (ALPHA_RA_REGNUM, bp_address);
-  write_register (ALPHA_T12_REGNUM, fun);
+static CORE_ADDR
+alpha_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+  ULONGEST pc;
+  frame_unwind_unsigned_register (next_frame, ALPHA_PC_REGNUM, &pc);
+  return pc;

 }
 
 }
 

-/* On the Alpha, the call dummy code is nevery copied to user space
-   (see alpha_fix_call_dummy() above).  The contents of this do not
-   matter.  */
-LONGEST alpha_call_dummy_words[] = { 0 };
+\f
+/* Helper routines for alpha*-nat.c files to move register sets to and
+   from core files.  The UNIQUE pointer is allowed to be NULL, as most
+   targets don't supply this value in their core files.  */

 
 

-static int
-alpha_use_struct_convention (int gcc_p, struct type *type)
+void
+alpha_supply_int_regs (int regno, const void *r0_r30,
+                      const void *pc, const void *unique)

 {
 {

-  /* Structures are returned by ref in extra arg0.  */
-  return 1;
+  int i;
+
+  for (i = 0; i < 31; ++i)
+    if (regno == i || regno == -1)
+      supply_register (i, (const char *)r0_r30 + i*8);
+
+  if (regno == ALPHA_ZERO_REGNUM || regno == -1)
+    supply_register (ALPHA_ZERO_REGNUM, NULL);
+
+  if (regno == ALPHA_PC_REGNUM || regno == -1)
+    supply_register (ALPHA_PC_REGNUM, pc);
+
+  if (regno == ALPHA_UNIQUE_REGNUM || regno == -1)
+    supply_register (ALPHA_UNIQUE_REGNUM, unique);

 }
 
 }
 

-static void
-alpha_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+void
+alpha_fill_int_regs (int regno, void *r0_r30, void *pc, void *unique)

 {
 {

-  /* Store the address of the place in which to copy the structure the
-     subroutine will return.  Handled by alpha_push_arguments.  */
+  int i;
+
+  for (i = 0; i < 31; ++i)
+    if (regno == i || regno == -1)
+      regcache_collect (i, (char *)r0_r30 + i*8);
+
+  if (regno == ALPHA_PC_REGNUM || regno == -1)
+    regcache_collect (ALPHA_PC_REGNUM, pc);
+
+  if (unique && (regno == ALPHA_UNIQUE_REGNUM || regno == -1))
+    regcache_collect (ALPHA_UNIQUE_REGNUM, unique);

 }
 
 }
 

-static CORE_ADDR
-alpha_extract_struct_value_address (char *regbuf)
+void
+alpha_supply_fp_regs (int regno, const void *f0_f30, const void *fpcr)

 {
 {

-  return (extract_address (regbuf + REGISTER_BYTE (ALPHA_V0_REGNUM),
-                          REGISTER_RAW_SIZE (ALPHA_V0_REGNUM)));
-}
+  int i;

 
 

-/* Figure out where the longjmp will land.
-   We expect the first arg to be a pointer to the jmp_buf structure from
-   which we extract the PC (JB_PC) that we will land at.  The PC is copied
-   into the "pc".  This routine returns true on success.  */
+  for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; ++i)
+    if (regno == i || regno == -1)
+      supply_register (i, (const char *)f0_f30 + (i - ALPHA_FP0_REGNUM) * 8);

 
 

-static int
-alpha_get_longjmp_target (CORE_ADDR *pc)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-  CORE_ADDR jb_addr;
-  char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE];
+  if (regno == ALPHA_FPCR_REGNUM || regno == -1)
+    supply_register (ALPHA_FPCR_REGNUM, fpcr);
+}

 
 

-  jb_addr = read_register (ALPHA_A0_REGNUM);
+void
+alpha_fill_fp_regs (int regno, void *f0_f30, void *fpcr)
+{
+  int i;

 
 

-  if (target_read_memory (jb_addr + (tdep->jb_pc * tdep->jb_elt_size),
-                         raw_buffer, tdep->jb_elt_size))
-    return 0;
+  for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; ++i)
+    if (regno == i || regno == -1)
+      regcache_collect (i, (char *)f0_f30 + (i - ALPHA_FP0_REGNUM) * 8);

 
 

-  *pc = extract_address (raw_buffer, tdep->jb_elt_size);
-  return 1;
+  if (regno == ALPHA_FPCR_REGNUM || regno == -1)
+    regcache_collect (ALPHA_FPCR_REGNUM, fpcr);

 }
 
 }
 

+\f

 /* alpha_software_single_step() is called just before we want to resume
    the inferior, if we want to single-step it but there is no hardware
    or kernel single-step support (NetBSD on Alpha, for example).  We find
 /* alpha_software_single_step() is called just before we want to resume
    the inferior, if we want to single-step it but there is no hardware
    or kernel single-step support (NetBSD on Alpha, for example).  We find


@@ -1729,6 +1406,8 @@ alpha_next_pc (CORE_ADDR pc)
          if (rav >= 0)
            goto branch_taken;
          break;
          if (rav >= 0)
            goto branch_taken;
          break;

+
+       /* ??? Missing floating-point branches.  */

        }
     }
 
        }
     }
 


@@ -1760,7 +1439,6 @@ alpha_software_single_step (enum target_signal sig, int insert_breakpoints_p)
 }
 
 \f
 }
 
 \f

-

 /* Initialize the current architecture based on INFO.  If possible, re-use an
    architecture from ARCHES, which is a list of architectures already created
    during this debugging session.
 /* Initialize the current architecture based on INFO.  If possible, re-use an
    architecture from ARCHES, which is a list of architectures already created
    during this debugging session.


@@ -1790,12 +1468,11 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   tdep = xmalloc (sizeof (struct gdbarch_tdep));
   gdbarch = gdbarch_alloc (&info, tdep);
 
   tdep = xmalloc (sizeof (struct gdbarch_tdep));
   gdbarch = gdbarch_alloc (&info, tdep);
 

-  /* Lowest text address.  This is used by heuristic_proc_start() to
-     decide when to stop looking.  */
+  /* Lowest text address.  This is used by heuristic_proc_start()
+     to decide when to stop looking.  */

   tdep->vm_min_address = (CORE_ADDR) 0x120000000;
 
   tdep->dynamic_sigtramp_offset = NULL;
   tdep->vm_min_address = (CORE_ADDR) 0x120000000;
 
   tdep->dynamic_sigtramp_offset = NULL;

-  tdep->skip_sigtramp_frame = NULL;

   tdep->sigcontext_addr = NULL;
 
   tdep->jb_pc = -1;    /* longjmp support not enabled by default  */
   tdep->sigcontext_addr = NULL;
 
   tdep->jb_pc = -1;    /* longjmp support not enabled by default  */


@@ -1813,19 +1490,13 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   /* Register info */
   set_gdbarch_num_regs (gdbarch, ALPHA_NUM_REGS);
   set_gdbarch_sp_regnum (gdbarch, ALPHA_SP_REGNUM);
   /* Register info */
   set_gdbarch_num_regs (gdbarch, ALPHA_NUM_REGS);
   set_gdbarch_sp_regnum (gdbarch, ALPHA_SP_REGNUM);

-  set_gdbarch_fp_regnum (gdbarch, ALPHA_FP_REGNUM);

   set_gdbarch_pc_regnum (gdbarch, ALPHA_PC_REGNUM);
   set_gdbarch_fp0_regnum (gdbarch, ALPHA_FP0_REGNUM);
 
   set_gdbarch_register_name (gdbarch, alpha_register_name);
   set_gdbarch_pc_regnum (gdbarch, ALPHA_PC_REGNUM);
   set_gdbarch_fp0_regnum (gdbarch, ALPHA_FP0_REGNUM);
 
   set_gdbarch_register_name (gdbarch, alpha_register_name);

-  set_gdbarch_register_size (gdbarch, ALPHA_REGISTER_SIZE);
-  set_gdbarch_register_bytes (gdbarch, ALPHA_REGISTER_BYTES);

   set_gdbarch_register_byte (gdbarch, alpha_register_byte);
   set_gdbarch_register_raw_size (gdbarch, alpha_register_raw_size);
   set_gdbarch_register_byte (gdbarch, alpha_register_byte);
   set_gdbarch_register_raw_size (gdbarch, alpha_register_raw_size);

-  set_gdbarch_max_register_raw_size (gdbarch, ALPHA_MAX_REGISTER_RAW_SIZE);

   set_gdbarch_register_virtual_size (gdbarch, alpha_register_virtual_size);
   set_gdbarch_register_virtual_size (gdbarch, alpha_register_virtual_size);

-  set_gdbarch_max_register_virtual_size (gdbarch,
-                                         ALPHA_MAX_REGISTER_VIRTUAL_SIZE);

   set_gdbarch_register_virtual_type (gdbarch, alpha_register_virtual_type);
 
   set_gdbarch_cannot_fetch_register (gdbarch, alpha_cannot_fetch_register);
   set_gdbarch_register_virtual_type (gdbarch, alpha_register_virtual_type);
 
   set_gdbarch_cannot_fetch_register (gdbarch, alpha_cannot_fetch_register);


@@ -1836,57 +1507,34 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
                                            alpha_register_convert_to_virtual);
   set_gdbarch_register_convert_to_raw (gdbarch, alpha_register_convert_to_raw);
 
                                            alpha_register_convert_to_virtual);
   set_gdbarch_register_convert_to_raw (gdbarch, alpha_register_convert_to_raw);
 

+  set_gdbarch_register_reggroup_p (gdbarch, alpha_register_reggroup_p);
+
+  /* Prologue heuristics.  */

   set_gdbarch_skip_prologue (gdbarch, alpha_skip_prologue);
 
   set_gdbarch_skip_prologue (gdbarch, alpha_skip_prologue);
 

+  /* Disassembler.  */
+  set_gdbarch_print_insn (gdbarch, print_insn_alpha);
+
+  /* Call info.  */

   set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
   set_gdbarch_frameless_function_invocation (gdbarch,
                                     generic_frameless_function_invocation_not);
 
   set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
   set_gdbarch_frameless_function_invocation (gdbarch,
                                     generic_frameless_function_invocation_not);
 

-  set_gdbarch_saved_pc_after_call (gdbarch, alpha_saved_pc_after_call);
-
-  set_gdbarch_frame_chain (gdbarch, alpha_frame_chain);
-  set_gdbarch_frame_saved_pc (gdbarch, alpha_frame_saved_pc);
-
-  set_gdbarch_frame_init_saved_regs (gdbarch, alpha_frame_init_saved_regs);
-

   set_gdbarch_use_struct_convention (gdbarch, alpha_use_struct_convention);
   set_gdbarch_use_struct_convention (gdbarch, alpha_use_struct_convention);

-  set_gdbarch_deprecated_extract_return_value (gdbarch, alpha_extract_return_value);
-
-  set_gdbarch_store_struct_return (gdbarch, alpha_store_struct_return);
-  set_gdbarch_deprecated_store_return_value (gdbarch, alpha_store_return_value);
-  set_gdbarch_deprecated_extract_struct_value_address (gdbarch,
+  set_gdbarch_extract_return_value (gdbarch, alpha_extract_return_value);
+  set_gdbarch_store_return_value (gdbarch, alpha_store_return_value);
+  set_gdbarch_extract_struct_value_address (gdbarch,

                                            alpha_extract_struct_value_address);
 
   /* Settings for calling functions in the inferior.  */
                                            alpha_extract_struct_value_address);
 
   /* Settings for calling functions in the inferior.  */

-  set_gdbarch_deprecated_use_generic_dummy_frames (gdbarch, 0);
-  set_gdbarch_call_dummy_length (gdbarch, 0);
-  set_gdbarch_push_arguments (gdbarch, alpha_push_arguments);
-  set_gdbarch_pop_frame (gdbarch, alpha_pop_frame);
-
-  /* On the Alpha, the call dummy code is never copied to user space,
-     stopping the user call is achieved via a bp_call_dummy breakpoint.
-     But we need a fake CALL_DUMMY definition to enable the proper
-     call_function_by_hand and to avoid zero length array warnings.  */
-  set_gdbarch_call_dummy_p (gdbarch, 1);
-  set_gdbarch_call_dummy_words (gdbarch, alpha_call_dummy_words);
-  set_gdbarch_sizeof_call_dummy_words (gdbarch, 0);
-  set_gdbarch_frame_args_address (gdbarch, alpha_frame_args_address);
-  set_gdbarch_frame_locals_address (gdbarch, alpha_frame_locals_address);
-  set_gdbarch_init_extra_frame_info (gdbarch, alpha_init_extra_frame_info);
-
-  /* Alpha OSF/1 inhibits execution of code on the stack.  But there is
-     no need for a dummy on the Alpha.  PUSH_ARGUMENTS takes care of all
-     argument handling and bp_call_dummy takes care of stopping the dummy.  */
-  set_gdbarch_call_dummy_address (gdbarch, alpha_call_dummy_address);
-  set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
-  set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0);
-  set_gdbarch_call_dummy_start_offset (gdbarch, 0);
-  set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point);
-  set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
-  set_gdbarch_push_dummy_frame (gdbarch, alpha_push_dummy_frame);
-  set_gdbarch_fix_call_dummy (gdbarch, alpha_fix_call_dummy);
-  set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_noop);
-  set_gdbarch_deprecated_init_frame_pc_first (gdbarch, alpha_init_frame_pc_first);
+  set_gdbarch_push_dummy_call (gdbarch, alpha_push_dummy_call);
+
+  /* Methods for saving / extracting a dummy frame's ID.  */
+  set_gdbarch_unwind_dummy_id (gdbarch, alpha_unwind_dummy_id);
+  set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
+
+  /* Return the unwound PC value.  */
+  set_gdbarch_unwind_pc (gdbarch, alpha_unwind_pc);

 
   set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 
   set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);


@@ -1906,27 +1554,12 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   if (tdep->jb_pc >= 0)
     set_gdbarch_get_longjmp_target (gdbarch, alpha_get_longjmp_target);
 
   if (tdep->jb_pc >= 0)
     set_gdbarch_get_longjmp_target (gdbarch, alpha_get_longjmp_target);
 

-  return gdbarch;
-}
-
-static void
-alpha_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
-  if (tdep == NULL)
-    return;
+  frame_unwind_append_predicate (gdbarch, alpha_sigtramp_frame_p);
+  frame_unwind_append_predicate (gdbarch, alpha_heuristic_frame_p);

 
 

-  fprintf_unfiltered (file,
-                      "alpha_dump_tdep: vm_min_address = 0x%lx\n",
-                     (long) tdep->vm_min_address);
+  frame_base_set_default (gdbarch, &alpha_heuristic_frame_base);

 
 

-  fprintf_unfiltered (file,
-                     "alpha_dump_tdep: jb_pc = %d\n",
-                     tdep->jb_pc);
-  fprintf_unfiltered (file,
-                     "alpha_dump_tdep: jb_elt_size = %ld\n",
-                     (long) tdep->jb_elt_size);
+  return gdbarch;

 }
 
 void
 }
 
 void


@@ -1934,9 +1567,7 @@ _initialize_alpha_tdep (void)
 {
   struct cmd_list_element *c;
 
 {
   struct cmd_list_element *c;
 

-  gdbarch_register (bfd_arch_alpha, alpha_gdbarch_init, alpha_dump_tdep);
-
-  tm_print_insn = print_insn_alpha;
+  gdbarch_register (bfd_arch_alpha, alpha_gdbarch_init, NULL);

 
   /* Let the user set the fence post for heuristic_proc_start.  */
 
 
   /* Let the user set the fence post for heuristic_proc_start.  */