Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 884 insertions, 0 deletions

diff --git a/gdb/v850-tdep.c b/gdb/v850-tdep.c
new file mode 100644
index 0000000..b98a4bd
--- /dev/null
+++ b/gdb/v850-tdep.c
@@ -0,0 +1,884 @@
+/* Target-dependent code for the NEC V850 for GDB, the GNU debugger.
+   Copyright 1996, Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "frame.h"
+#include "inferior.h"
+#include "obstack.h"
+#include "target.h"
+#include "value.h"
+#include "bfd.h"
+#include "gdb_string.h"
+#include "gdbcore.h"
+#include "symfile.h"
+
+
+static char *v850_generic_reg_names[] = REGISTER_NAMES;
+
+static char *v850e_reg_names[] =
+{
+  "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+  "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+  "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
+  "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
+  "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7",
+  "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15",
+  "ctpc", "ctpsw", "dbpc", "dbpsw", "ctbp", "sr21", "sr22", "sr23",
+  "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31",
+  "pc", "fp"
+};
+
+char **v850_register_names = v850_generic_reg_names;
+
+struct
+{
+  char **regnames;
+  int mach;
+} v850_processor_type_table[] =
+{
+  { v850_generic_reg_names, bfd_mach_v850 },
+  { v850e_reg_names, bfd_mach_v850e },
+  { v850e_reg_names, bfd_mach_v850ea },
+  { NULL, 0 }
+};
+
+/* Info gleaned from scanning a function's prologue.  */
+
+struct pifsr			/* Info about one saved reg */
+{
+  int framereg;			/* Frame reg (SP or FP) */
+  int offset;			/* Offset from framereg */
+  int cur_frameoffset;		/* Current frameoffset */
+  int reg;			/* Saved register number */
+};
+
+struct prologue_info
+{
+  int framereg;
+  int frameoffset;
+  int start_function;
+  struct pifsr *pifsrs;
+};
+
+static CORE_ADDR v850_scan_prologue PARAMS ((CORE_ADDR pc, 
+					     struct prologue_info *fs));
+
+
+/* Should call_function allocate stack space for a struct return?  */
+int
+v850_use_struct_convention (gcc_p, type)
+     int gcc_p;
+     struct type *type;
+{
+  return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 4);
+}
+
+
+
+/* Structure for mapping bits in register lists to register numbers. */
+struct reg_list 
+{
+  long mask;
+  int regno;
+};
+
+/* Helper function for v850_scan_prologue to handle prepare instruction. */
+
+static void
+handle_prepare (int insn, int insn2, CORE_ADDR *current_pc_ptr,
+		struct prologue_info *pi, struct pifsr **pifsr_ptr)
+
+{
+  CORE_ADDR current_pc = *current_pc_ptr;
+  struct pifsr *pifsr = *pifsr_ptr;
+  long next = insn2 & 0xffff;
+  long list12 = ((insn & 1) << 16) + (next & 0xffe0);
+  long offset = (insn & 0x3e) << 1;
+  static struct reg_list reg_table [] =
+  {
+    { 0x00800, 20 },	/* r20 */
+    { 0x00400, 21 },	/* r21 */
+    { 0x00200, 22 },	/* r22 */
+    { 0x00100, 23 },	/* r23 */
+    { 0x08000, 24 },	/* r24 */
+    { 0x04000, 25 },	/* r25 */
+    { 0x02000, 26 },	/* r26 */
+    { 0x01000, 27 },	/* r27 */
+    { 0x00080, 28 },	/* r28 */
+    { 0x00040, 29 },	/* r29 */
+    { 0x10000, 30 },	/* ep */
+    { 0x00020, 31 },	/* lp */
+    { 0, 0 }		/* end of table */
+  };
+  int i;
+
+  if ((next & 0x1f) == 0x0b)		/* skip imm16 argument */
+    current_pc += 2;
+  else if ((next & 0x1f) == 0x13)	/* skip imm16 argument */
+    current_pc += 2;
+  else if ((next & 0x1f) == 0x1b)	/* skip imm32 argument */
+    current_pc += 4;
+
+  /* Calculate the total size of the saved registers, and add it
+     it to the immediate value used to adjust SP. */
+  for (i = 0; reg_table[i].mask != 0; i++)
+    if (list12 & reg_table[i].mask)
+      offset += REGISTER_RAW_SIZE (regtable[i].regno);
+  pi->frameoffset -= offset;
+
+  /* Calculate the offsets of the registers relative to the value
+     the SP will have after the registers have been pushed and the
+     imm5 value has been subtracted from it. */
+  if (pifsr)
+    {
+      for (i = 0; reg_table[i].mask != 0; i++)
+	{
+	  if (list12 & reg_table[i].mask)
+	    {
+	      int reg = reg_table[i].regno;
+	      offset -= REGISTER_RAW_SIZE (reg);
+	      pifsr->reg = reg;
+	      pifsr->offset = offset;
+	      pifsr->cur_frameoffset = pi->frameoffset;
+    #ifdef DEBUG
+	      printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset);
+    #endif
+	      pifsr++;
+	    }
+	}
+    }
+#ifdef DEBUG
+  printf_filtered ("\tfound ctret after regsave func");
+#endif
+
+  /* Set result parameters. */
+  *current_pc_ptr = current_pc;
+  *pifsr_ptr = pifsr;
+}
+
+
+/* Helper function for v850_scan_prologue to handle pushm/pushl instructions.
+   FIXME: the SR bit of the register list is not supported; must check
+   that the compiler does not ever generate this bit. */
+
+static void
+handle_pushm (int insn, int insn2, struct prologue_info *pi,
+	     struct pifsr **pifsr_ptr)
+
+{
+  struct pifsr *pifsr = *pifsr_ptr;
+  long list12 = ((insn & 0x0f) << 16) + (insn2 & 0xfff0);
+  long offset = 0;
+  static struct reg_list pushml_reg_table [] =
+  {
+    { 0x80000, PS_REGNUM },	/* PSW */
+    { 0x40000, 1 },		/* r1 */
+    { 0x20000, 2 },		/* r2 */
+    { 0x10000, 3 },		/* r3 */
+    { 0x00800, 4 },		/* r4 */
+    { 0x00400, 5 },		/* r5 */
+    { 0x00200, 6 },		/* r6 */
+    { 0x00100, 7 },		/* r7 */
+    { 0x08000, 8 },		/* r8 */
+    { 0x04000, 9 },		/* r9 */
+    { 0x02000, 10 },		/* r10 */
+    { 0x01000, 11 },		/* r11 */
+    { 0x00080, 12 },		/* r12 */
+    { 0x00040, 13 },		/* r13 */
+    { 0x00020, 14 },		/* r14 */
+    { 0x00010, 15 },		/* r15 */
+    { 0, 0 }		/* end of table */
+  };
+  static struct reg_list pushmh_reg_table [] =
+  {
+    { 0x80000, 16 },		/* r16 */
+    { 0x40000, 17 },		/* r17 */
+    { 0x20000, 18 },		/* r18 */
+    { 0x10000, 19 },		/* r19 */
+    { 0x00800, 20 },		/* r20 */
+    { 0x00400, 21 },		/* r21 */
+    { 0x00200, 22 },		/* r22 */
+    { 0x00100, 23 },		/* r23 */
+    { 0x08000, 24 },		/* r24 */
+    { 0x04000, 25 },		/* r25 */
+    { 0x02000, 26 },		/* r26 */
+    { 0x01000, 27 },		/* r27 */
+    { 0x00080, 28 },		/* r28 */
+    { 0x00040, 29 },		/* r29 */
+    { 0x00010, 30 },		/* r30 */
+    { 0x00020, 31 },		/* r31 */
+    { 0, 0 }		/* end of table */
+  };
+  struct reg_list *reg_table;
+  int i;
+
+  /* Is this a pushml or a pushmh? */
+  if ((insn2 & 7) == 1)
+    reg_table = pushml_reg_table;
+  else
+    reg_table = pushmh_reg_table;
+
+  /* Calculate the total size of the saved registers, and add it
+     it to the immediate value used to adjust SP. */
+  for (i = 0; reg_table[i].mask != 0; i++)
+    if (list12 & reg_table[i].mask)
+      offset += REGISTER_RAW_SIZE (regtable[i].regno);
+  pi->frameoffset -= offset;
+
+  /* Calculate the offsets of the registers relative to the value
+     the SP will have after the registers have been pushed and the
+     imm5 value is subtracted from it. */
+  if (pifsr)
+    {
+      for (i = 0; reg_table[i].mask != 0; i++)
+	{
+	  if (list12 & reg_table[i].mask)
+	    {
+	      int reg = reg_table[i].regno;
+	      offset -= REGISTER_RAW_SIZE (reg);
+	      pifsr->reg = reg;
+	      pifsr->offset = offset;
+	      pifsr->cur_frameoffset = pi->frameoffset;
+    #ifdef DEBUG
+	      printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset);
+    #endif
+	      pifsr++;
+	    }
+	}
+    }
+#ifdef DEBUG
+  printf_filtered ("\tfound ctret after regsave func");
+#endif
+
+  /* Set result parameters. */
+  *pifsr_ptr = pifsr;
+}
+
+
+
+
+/* Function: scan_prologue
+   Scan the prologue of the function that contains PC, and record what
+   we find in PI.  PI->fsr must be zeroed by the called.  Returns the
+   pc after the prologue.  Note that the addresses saved in pi->fsr
+   are actually just frame relative (negative offsets from the frame
+   pointer).  This is because we don't know the actual value of the
+   frame pointer yet.  In some circumstances, the frame pointer can't
+   be determined till after we have scanned the prologue.  */
+
+static CORE_ADDR
+v850_scan_prologue (pc, pi)
+     CORE_ADDR pc;
+     struct prologue_info *pi;
+{
+  CORE_ADDR func_addr, prologue_end, current_pc;
+  struct pifsr *pifsr, *pifsr_tmp;
+  int fp_used;
+  int ep_used;
+  int reg;
+  CORE_ADDR save_pc, save_end;
+  int regsave_func_p;
+  int r12_tmp;
+
+  /* First, figure out the bounds of the prologue so that we can limit the
+     search to something reasonable.  */
+
+  if (find_pc_partial_function (pc, NULL, &func_addr, NULL))
+    {
+      struct symtab_and_line sal;
+
+      sal = find_pc_line (func_addr, 0);
+
+      if (func_addr == entry_point_address ())
+	pi->start_function = 1;
+      else
+	pi->start_function = 0;
+
+#if 0
+      if (sal.line == 0)
+	prologue_end = pc;
+      else
+	prologue_end = sal.end;
+#else
+      prologue_end = pc;
+#endif
+    }
+  else
+    {				/* We're in the boondocks */
+      func_addr = pc - 100;
+      prologue_end = pc;
+    }
+
+  prologue_end = min (prologue_end, pc);
+
+  /* Now, search the prologue looking for instructions that setup fp, save
+     rp, adjust sp and such.  We also record the frame offset of any saved
+     registers. */ 
+
+  pi->frameoffset = 0;
+  pi->framereg = SP_REGNUM;
+  fp_used = 0;
+  ep_used = 0;
+  pifsr = pi->pifsrs;
+  regsave_func_p = 0;
+  save_pc = 0;
+  save_end = 0;
+  r12_tmp = 0;
+
+#ifdef DEBUG
+  printf_filtered ("Current_pc = 0x%.8lx, prologue_end = 0x%.8lx\n",
+		   (long)func_addr, (long)prologue_end);
+#endif
+
+  for (current_pc = func_addr; current_pc < prologue_end; )
+    {
+      int insn, insn2;
+
+#ifdef DEBUG
+      printf_filtered ("0x%.8lx ", (long)current_pc);
+      (*tm_print_insn) (current_pc, &tm_print_insn_info);
+#endif
+
+      insn = read_memory_unsigned_integer (current_pc, 2);
+      current_pc += 2;
+      if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */
+	{
+	  insn2 = read_memory_unsigned_integer (current_pc, 2);
+	  current_pc += 2;
+	}
+
+      if ((insn & 0xffc0) == ((10 << 11) | 0x0780) && !regsave_func_p)
+	{			/* jarl <func>,10 */
+	  long low_disp = insn2 & ~ (long) 1;
+	  long disp = (((((insn & 0x3f) << 16) + low_disp)
+			& ~ (long) 1) ^ 0x00200000) - 0x00200000;
+
+	  save_pc = current_pc;
+	  save_end = prologue_end;
+	  regsave_func_p = 1;
+	  current_pc += disp - 4;
+	  prologue_end = (current_pc
+			  + (2 * 3)	/* moves to/from ep */
+			  + 4		/* addi <const>,sp,sp */
+			  + 2		/* jmp [r10] */
+			  + (2 * 12)	/* sst.w to save r2, r20-r29, r31 */
+			  + 20);	/* slop area */
+
+#ifdef DEBUG
+	  printf_filtered ("\tfound jarl <func>,r10, disp = %ld, low_disp = %ld, new pc = 0x%.8lx\n",
+			   disp, low_disp, (long)current_pc + 2);
+#endif
+	  continue;
+	}
+      else if ((insn & 0xffc0) == 0x0200 && !regsave_func_p)
+	{			/* callt <imm6> */
+	  long ctbp = read_register (CTBP_REGNUM);
+	  long adr = ctbp + ((insn & 0x3f) << 1);
+
+	  save_pc = current_pc;
+	  save_end = prologue_end;
+	  regsave_func_p = 1;
+	  current_pc = ctbp + (read_memory_unsigned_integer (adr, 2) & 0xffff);
+	  prologue_end = (current_pc
+			  + (2 * 3)	/* prepare list2,imm5,sp/imm */
+			  + 4		/* ctret */
+			  + 20);	/* slop area */
+
+#ifdef DEBUG
+	  printf_filtered ("\tfound callt,  ctbp = 0x%.8lx, adr = %.8lx, new pc = 0x%.8lx\n",
+			   ctbp, adr, (long)current_pc);
+#endif
+	  continue;
+	}
+      else if ((insn & 0xffc0) == 0x0780)	/* prepare list2,imm5 */
+	{
+	  handle_prepare (insn, insn2, &current_pc, pi, &pifsr);
+	  continue;
+	}
+      else if (insn == 0x07e0 && regsave_func_p && insn2 == 0x0144)
+	{			/* ctret after processing register save function */
+	  current_pc = save_pc;
+	  prologue_end = save_end;
+	  regsave_func_p = 0;
+#ifdef DEBUG
+	  printf_filtered ("\tfound ctret after regsave func");
+#endif
+	  continue;
+	}
+      else if ((insn & 0xfff0) == 0x07e0 && (insn2 & 5) == 1)
+	{			/* pushml, pushmh */
+	  handle_pushm (insn, insn2, pi, &pifsr);
+	  continue;
+	}
+      else if ((insn & 0xffe0) == 0x0060 && regsave_func_p)
+	{			/* jmp after processing register save function */
+	  current_pc = save_pc;
+	  prologue_end = save_end;
+	  regsave_func_p = 0;
+#ifdef DEBUG
+	  printf_filtered ("\tfound jmp after regsave func");
+#endif
+	  continue;
+	}
+      else if ((insn & 0x07c0) == 0x0780	/* jarl or jr */
+	       || (insn & 0xffe0) == 0x0060	/* jmp */
+	       || (insn & 0x0780) == 0x0580)	/* branch */
+	{
+#ifdef DEBUG
+	  printf_filtered ("\n");
+#endif
+	  break;				/* Ran into end of prologue */
+	}
+
+      else if ((insn & 0xffe0) == ((SP_REGNUM << 11) | 0x0240))		/* add <imm>,sp */
+	pi->frameoffset += ((insn & 0x1f) ^ 0x10) - 0x10;
+      else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM))	/* addi <imm>,sp,sp */
+	pi->frameoffset += insn2;
+      else if (insn == ((FP_RAW_REGNUM << 11) | 0x0000 | SP_REGNUM))	/* mov sp,fp */
+	{
+	  fp_used = 1;
+	  pi->framereg = FP_RAW_REGNUM;
+	}
+
+      else if (insn == ((R12_REGNUM << 11) | 0x0640 | R0_REGNUM))	/* movhi hi(const),r0,r12 */
+	r12_tmp = insn2 << 16;
+      else if (insn == ((R12_REGNUM << 11) | 0x0620 | R12_REGNUM))	/* movea lo(const),r12,r12 */
+	r12_tmp += insn2;
+      else if (insn == ((SP_REGNUM << 11) | 0x01c0 | R12_REGNUM) && r12_tmp) /* add r12,sp */
+	pi->frameoffset = r12_tmp;
+      else if (insn == ((EP_REGNUM << 11) | 0x0000 | SP_REGNUM))	/* mov sp,ep */
+	ep_used = 1;
+      else if (insn == ((EP_REGNUM << 11) | 0x0000 | R1_REGNUM))	/* mov r1,ep */
+	ep_used = 0;
+      else if (((insn & 0x07ff) == (0x0760 | SP_REGNUM)			/* st.w <reg>,<offset>[sp] */
+		|| (fp_used
+		    && (insn & 0x07ff) == (0x0760 | FP_RAW_REGNUM)))	/* st.w <reg>,<offset>[fp] */
+	       && pifsr
+	       && (((reg = (insn >> 11) & 0x1f) >= SAVE1_START_REGNUM && reg <= SAVE1_END_REGNUM)
+		   || (reg >= SAVE2_START_REGNUM && reg <= SAVE2_END_REGNUM)
+		   || (reg >= SAVE3_START_REGNUM && reg <= SAVE3_END_REGNUM)))
+	{
+	  pifsr->reg = reg;
+	  pifsr->offset = insn2 & ~1;
+	  pifsr->cur_frameoffset = pi->frameoffset;
+#ifdef DEBUG
+	  printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset);
+#endif
+	  pifsr++;
+	}
+
+      else if (ep_used						/* sst.w <reg>,<offset>[ep] */
+	       && ((insn & 0x0781) == 0x0501)
+	       && pifsr
+	       && (((reg = (insn >> 11) & 0x1f) >= SAVE1_START_REGNUM && reg <= SAVE1_END_REGNUM)
+		   || (reg >= SAVE2_START_REGNUM && reg <= SAVE2_END_REGNUM)
+		   || (reg >= SAVE3_START_REGNUM && reg <= SAVE3_END_REGNUM)))
+	{
+	  pifsr->reg = reg;
+	  pifsr->offset = (insn & 0x007e) << 1;
+	  pifsr->cur_frameoffset = pi->frameoffset;
+#ifdef DEBUG
+	  printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset);
+#endif
+	  pifsr++;
+	}
+
+#ifdef DEBUG
+      printf_filtered ("\n");
+#endif
+    }
+
+  if (pifsr)
+    pifsr->framereg = 0;	/* Tie off last entry */
+
+  /* Fix up any offsets to the final offset.  If a frame pointer was created, use it
+     instead of the stack pointer.  */
+  for (pifsr_tmp = pi->pifsrs; pifsr_tmp && pifsr_tmp != pifsr; pifsr_tmp++)
+    {
+      pifsr_tmp->offset -= pi->frameoffset - pifsr_tmp->cur_frameoffset;
+      pifsr_tmp->framereg = pi->framereg;
+
+#ifdef DEBUG
+      printf_filtered ("Saved register r%d, offset = %d, framereg = r%d\n",
+		       pifsr_tmp->reg, pifsr_tmp->offset, pifsr_tmp->framereg);
+#endif
+    }
+
+#ifdef DEBUG
+  printf_filtered ("Framereg = r%d, frameoffset = %d\n", pi->framereg, pi->frameoffset);
+#endif
+
+  return current_pc;
+}
+
+/* Function: init_extra_frame_info
+   Setup the frame's frame pointer, pc, and frame addresses for saved
+   registers.  Most of the work is done in scan_prologue().
+
+   Note that when we are called for the last frame (currently active frame),
+   that fi->pc and fi->frame will already be setup.  However, fi->frame will
+   be valid only if this routine uses FP.  For previous frames, fi-frame will
+   always be correct (since that is derived from v850_frame_chain ()).
+
+   We can be called with the PC in the call dummy under two circumstances.
+   First, during normal backtracing, second, while figuring out the frame
+   pointer just prior to calling the target function (see run_stack_dummy).  */
+
+void
+v850_init_extra_frame_info (fi)
+     struct frame_info *fi;
+{
+  struct prologue_info pi;
+  struct pifsr pifsrs[NUM_REGS + 1], *pifsr;
+
+  if (fi->next)
+    fi->pc = FRAME_SAVED_PC (fi->next);
+
+  memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
+
+  /* The call dummy doesn't save any registers on the stack, so we can return
+     now.  */
+  if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+      return;
+
+  pi.pifsrs = pifsrs;
+
+  v850_scan_prologue (fi->pc, &pi);
+
+  if (!fi->next && pi.framereg == SP_REGNUM)
+    fi->frame = read_register (pi.framereg) - pi.frameoffset;
+
+  for (pifsr = pifsrs; pifsr->framereg; pifsr++)
+    {
+      fi->fsr.regs[pifsr->reg] = pifsr->offset + fi->frame;
+
+      if (pifsr->framereg == SP_REGNUM)
+	fi->fsr.regs[pifsr->reg] += pi.frameoffset;
+    }
+}
+
+/* Function: frame_chain
+   Figure out the frame prior to FI.  Unfortunately, this involves
+   scanning the prologue of the caller, which will also be done
+   shortly by v850_init_extra_frame_info.  For the dummy frame, we
+   just return the stack pointer that was in use at the time the
+   function call was made.  */
+
+CORE_ADDR
+v850_frame_chain (fi)
+     struct frame_info *fi;
+{
+  struct prologue_info pi;
+  CORE_ADDR callers_pc, fp;
+
+  /* First, find out who called us */
+  callers_pc = FRAME_SAVED_PC (fi);
+  /* If caller is a call-dummy, then our FP bears no relation to his FP! */
+  fp = v850_find_callers_reg (fi, FP_RAW_REGNUM);
+  if (PC_IN_CALL_DUMMY(callers_pc, fp, fp))
+    return fp;	/* caller is call-dummy: return oldest value of FP */
+
+  /* Caller is NOT a call-dummy, so everything else should just work.
+     Even if THIS frame is a call-dummy! */
+  pi.pifsrs = NULL;
+
+  v850_scan_prologue (callers_pc, &pi);
+
+  if (pi.start_function)
+    return 0;			/* Don't chain beyond the start function */
+
+  if (pi.framereg == FP_RAW_REGNUM)
+    return v850_find_callers_reg (fi, pi.framereg);
+
+  return fi->frame - pi.frameoffset;
+}
+
+/* Function: find_callers_reg
+   Find REGNUM on the stack.  Otherwise, it's in an active register.
+   One thing we might want to do here is to check REGNUM against the
+   clobber mask, and somehow flag it as invalid if it isn't saved on
+   the stack somewhere.  This would provide a graceful failure mode
+   when trying to get the value of caller-saves registers for an inner
+   frame.  */
+
+CORE_ADDR
+v850_find_callers_reg (fi, regnum)
+     struct frame_info *fi;
+     int regnum;
+{
+  for (; fi; fi = fi->next)
+    if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+      return generic_read_register_dummy (fi->pc, fi->frame, regnum);
+    else if (fi->fsr.regs[regnum] != 0)
+      return read_memory_unsigned_integer (fi->fsr.regs[regnum], 
+					   REGISTER_RAW_SIZE(regnum));
+
+  return read_register (regnum);
+}
+
+/* Function: skip_prologue
+   Return the address of the first code past the prologue of the function.  */
+
+CORE_ADDR
+v850_skip_prologue (pc)
+     CORE_ADDR pc;
+{
+  CORE_ADDR func_addr, func_end;
+
+  /* See what the symbol table says */
+
+  if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
+    {
+      struct symtab_and_line sal;
+
+      sal = find_pc_line (func_addr, 0);
+
+      if (sal.line != 0 && sal.end < func_end)
+	return sal.end;
+      else
+	/* Either there's no line info, or the line after the prologue is after
+	   the end of the function.  In this case, there probably isn't a
+	   prologue.  */
+	return pc;
+    }
+
+/* We can't find the start of this function, so there's nothing we can do. */
+  return pc;
+}
+
+/* Function: pop_frame
+   This routine gets called when either the user uses the `return'
+   command, or the call dummy breakpoint gets hit.  */
+
+void
+v850_pop_frame (frame)
+     struct frame_info *frame;
+{
+  int regnum;
+
+  if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame))
+    generic_pop_dummy_frame ();
+  else
+    {
+      write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
+
+      for (regnum = 0; regnum < NUM_REGS; regnum++)
+	if (frame->fsr.regs[regnum] != 0)
+	  write_register (regnum,
+			  read_memory_unsigned_integer (frame->fsr.regs[regnum],
+							REGISTER_RAW_SIZE(regnum)));
+
+      write_register (SP_REGNUM, FRAME_FP (frame));
+    }
+
+  flush_cached_frames ();
+}
+
+/* Function: push_arguments
+   Setup arguments and RP for a call to the target.  First four args
+   go in R6->R9, subsequent args go into sp + 16 -> sp + ...  Structs
+   are passed by reference.  64 bit quantities (doubles and long
+   longs) may be split between the regs and the stack.  When calling a
+   function that returns a struct, a pointer to the struct is passed
+   in as a secret first argument (always in R6).
+
+   Stack space for the args has NOT been allocated: that job is up to us.
+   */
+
+CORE_ADDR
+v850_push_arguments (nargs, args, sp, struct_return, struct_addr)
+     int nargs;
+     value_ptr *args;
+     CORE_ADDR sp;
+     unsigned char struct_return;
+     CORE_ADDR struct_addr;
+{
+  int argreg;
+  int argnum;
+  int len = 0;
+  int stack_offset;
+
+  /* First, just for safety, make sure stack is aligned */
+  sp &= ~3;
+
+  /* Now make space on the stack for the args. */
+  for (argnum = 0; argnum < nargs; argnum++)
+    len += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + 3) & ~3);
+  sp -= len;	/* possibly over-allocating, but it works... */
+		/* (you might think we could allocate 16 bytes */
+		/* less, but the ABI seems to use it all! )  */
+  argreg = ARG0_REGNUM;
+
+  /* the struct_return pointer occupies the first parameter-passing reg */
+  if (struct_return)
+      write_register (argreg++, struct_addr);
+
+  stack_offset = 16;
+  /* The offset onto the stack at which we will start copying parameters
+     (after the registers are used up) begins at 16 rather than at zero.
+     I don't really know why, that's just the way it seems to work.  */
+
+  /* Now load as many as possible of the first arguments into
+     registers, and push the rest onto the stack.  There are 16 bytes
+     in four registers available.  Loop thru args from first to last.  */
+  for (argnum = 0; argnum < nargs; argnum++)
+    {
+      int len;
+      char *val;
+      char valbuf[REGISTER_RAW_SIZE(ARG0_REGNUM)];
+
+      if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT
+	  && TYPE_LENGTH (VALUE_TYPE (*args)) > 8)
+	{
+	  store_address (valbuf, 4, VALUE_ADDRESS (*args));
+	  len = 4;
+	  val = valbuf;
+	}
+      else
+	{
+	  len = TYPE_LENGTH (VALUE_TYPE (*args));
+	  val = (char *)VALUE_CONTENTS (*args);
+	}
+
+      while (len > 0)
+	if  (argreg <= ARGLAST_REGNUM)
+	  {
+	    CORE_ADDR regval;
+
+	    regval = extract_address (val, REGISTER_RAW_SIZE (argreg));
+	    write_register (argreg, regval);
+
+	    len -= REGISTER_RAW_SIZE (argreg);
+	    val += REGISTER_RAW_SIZE (argreg);
+	    argreg++;
+	  }
+	else
+	  {
+	    write_memory (sp + stack_offset, val, 4);
+
+	    len -= 4;
+	    val += 4;
+	    stack_offset += 4;
+	  }
+      args++;
+    }
+  return sp;
+}
+
+/* Function: push_return_address (pc)
+   Set up the return address for the inferior function call.
+   Needed for targets where we don't actually execute a JSR/BSR instruction */
+ 
+CORE_ADDR
+v850_push_return_address (pc, sp)
+     CORE_ADDR pc;
+     CORE_ADDR sp;
+{
+  write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ());
+  return sp;
+}
+ 
+/* Function: frame_saved_pc 
+   Find the caller of this frame.  We do this by seeing if RP_REGNUM
+   is saved in the stack anywhere, otherwise we get it from the
+   registers.  If the inner frame is a dummy frame, return its PC
+   instead of RP, because that's where "caller" of the dummy-frame
+   will be found.  */
+
+CORE_ADDR
+v850_frame_saved_pc (fi)
+     struct frame_info *fi;
+{
+  if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame))
+    return generic_read_register_dummy(fi->pc, fi->frame, PC_REGNUM);
+  else
+    return v850_find_callers_reg (fi, RP_REGNUM);
+}
+
+void
+get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
+     char *raw_buffer;
+     int *optimized;
+     CORE_ADDR *addrp;
+     struct frame_info *frame;
+     int regnum;
+     enum lval_type *lval;
+{
+  generic_get_saved_register (raw_buffer, optimized, addrp, 
+			      frame, regnum, lval);
+}
+
+
+/* Function: fix_call_dummy
+   Pokes the callee function's address into the CALL_DUMMY assembly stub.
+   Assumes that the CALL_DUMMY looks like this:
+	jarl <offset24>, r31
+	trap
+   */
+
+int
+v850_fix_call_dummy (dummy, sp, fun, nargs, args, type, gcc_p)
+     char *dummy;
+     CORE_ADDR sp;
+     CORE_ADDR fun;
+     int nargs;
+     value_ptr *args;
+     struct type *type;
+     int gcc_p;
+{
+  long offset24;
+
+  offset24 = (long) fun - (long) entry_point_address ();
+  offset24 &= 0x3fffff;
+  offset24 |= 0xff800000;	/* jarl <offset24>, r31 */
+
+  store_unsigned_integer ((unsigned int *)&dummy[2], 2, offset24 & 0xffff);
+  store_unsigned_integer ((unsigned int *)&dummy[0], 2, offset24 >> 16);
+  return 0;
+}
+
+/* Change the register names based on the current machine type. */
+
+static int
+v850_target_architecture_hook (ap)
+     const bfd_arch_info_type *ap;
+{
+  int i, j;
+
+  if (ap->arch != bfd_arch_v850)
+    return 0;
+
+  for (i = 0; v850_processor_type_table[i].regnames != NULL; i++)
+    {
+      if (v850_processor_type_table[i].mach == ap->mach)
+	{
+	  v850_register_names = v850_processor_type_table[i].regnames;
+	  return 1;
+	}
+    }
+
+  fatal ("Architecture `%s' unreconized", ap->printable_name);
+}
+
+void
+_initialize_v850_tdep ()
+{
+  tm_print_insn = print_insn_v850;
+  target_architecture_hook = v850_target_architecture_hook;
+}