Add TMS320C4x support

1 files changed, 677 insertions, 0 deletions

diff --git a/opcodes/tic4x-dis.c b/opcodes/tic4x-dis.c
new file mode 100644
index 0000000..eff4ebb
--- /dev/null
+++ b/opcodes/tic4x-dis.c
@@ -0,0 +1,677 @@
+/* Print instructions for the Texas TMS320C[34]X, for GDB and GNU Binutils.
+
+   Copyright 2002 Free Software Foundation, Inc.
+
+   Contributed by Michael P. Hayes (m.hayes@elec.canterbury.ac.nz)
+   
+   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 <math.h>
+#include "libiberty.h"
+#include "dis-asm.h"
+#include "opcode/tic4x.h"
+
+#define C4X_DEBUG 0
+
+#define C4X_HASH_SIZE 11 /* 11 and above should give unique entries.  */
+
+typedef enum
+  {
+    IMMED_SINT,
+    IMMED_SUINT,
+    IMMED_SFLOAT,
+    IMMED_INT,
+    IMMED_UINT,
+    IMMED_FLOAT
+  }
+immed_t;
+
+typedef enum
+  {
+    INDIRECT_SHORT,
+    INDIRECT_LONG,
+    INDIRECT_C4X
+  }
+indirect_t;
+
+static int c4x_version = 0;
+static int c4x_dp = 0;
+
+static int
+c4x_pc_offset (unsigned int op)
+{
+  /* Determine the PC offset for a C[34]x instruction.
+     This could be simplified using some boolean algebra
+     but at the expense of readability.  */
+  switch (op >> 24)
+    {
+    case 0x60:	/* br */
+    case 0x62:	/* call  (C4x) */
+    case 0x64:	/* rptb  (C4x) */
+      return 1;
+    case 0x61: 	/* brd */
+    case 0x63: 	/* laj */
+    case 0x65:	/* rptbd (C4x) */
+      return 3;
+    case 0x66: 	/* swi */
+    case 0x67:
+      return 0;
+    default:
+      break;
+    }
+  
+  switch ((op & 0xffe00000) >> 20)
+    {
+    case 0x6a0:	/* bB */
+    case 0x720: /* callB */
+    case 0x740: /* trapB */
+      return 1;
+      
+    case 0x6a2: /* bBd */
+    case 0x6a6: /* bBat */
+    case 0x6aa: /* bBaf */
+    case 0x722:	/* lajB */
+    case 0x748: /* latB */
+    case 0x798: /* rptbd */
+      return 3;
+      
+    default:
+      break;
+    }
+  
+  switch ((op & 0xfe200000) >> 20)
+    {
+    case 0x6e0:	/* dbB */
+      return 1;
+      
+    case 0x6e2:	/* dbBd */
+      return 3;
+      
+    default:
+      break;
+    }
+  
+  return 0;
+}
+
+static int
+c4x_print_char (struct disassemble_info * info, char ch)
+{
+  if (info != NULL)
+    (*info->fprintf_func) (info->stream, "%c", ch);
+  return 1;
+}
+
+static int
+c4x_print_str (struct disassemble_info *info, char *str)
+{
+  if (info != NULL)
+    (*info->fprintf_func) (info->stream, "%s", str);
+  return 1;
+}
+
+static int
+c4x_print_register (struct disassemble_info *info,
+		    unsigned long regno)
+{
+  static c4x_register_t **registertable = NULL;
+  unsigned int i;
+  
+  if (registertable == NULL)
+    {
+      registertable = (c4x_register_t **)
+	xmalloc (sizeof (c4x_register_t *) * REG_TABLE_SIZE);
+      for (i = 0; i < c3x_num_registers; i++)
+	registertable[c3x_registers[i].regno] = (void *)&c3x_registers[i];
+      if (IS_CPU_C4X (c4x_version))
+	{
+	  /* Add C4x additional registers, overwriting
+	     any C3x registers if necessary.  */
+	  for (i = 0; i < c4x_num_registers; i++)
+	    registertable[c4x_registers[i].regno] = (void *)&c4x_registers[i];
+	}
+    }
+  if ((int) regno > (IS_CPU_C4X (c4x_version) ? C4X_REG_MAX : C3X_REG_MAX))
+    return 0;
+  if (info != NULL)
+    (*info->fprintf_func) (info->stream, "%s", registertable[regno]->name);
+  return 1;
+}
+
+static int
+c4x_print_addr (struct disassemble_info *info,
+		unsigned long addr)
+{
+  if (info != NULL)
+    (*info->print_address_func)(addr, info);
+  return 1;
+}
+
+static int
+c4x_print_relative (struct disassemble_info *info,
+		    unsigned long pc,
+		    long offset,
+		    unsigned long opcode)
+{
+  return c4x_print_addr (info, pc + offset + c4x_pc_offset (opcode));
+}
+
+static int
+c4x_print_direct (struct disassemble_info *info,
+		  unsigned long arg)
+{
+  if (info != NULL)
+    {
+      (*info->fprintf_func) (info->stream, "@");
+      c4x_print_addr (info, arg + (c4x_dp << 16));
+    }
+  return 1;
+}
+
+/* FIXME: make the floating point stuff not rely on host
+   floating point arithmetic.  */
+void
+c4x_print_ftoa (unsigned int val,
+		FILE *stream,
+		int (*pfunc)())
+{
+  int e;
+  int s;
+  int f;
+  double num = 0.0;
+  
+  e = EXTRS (val, 31, 24);	/* exponent */
+  if (e != -128)
+    {
+      s = EXTRU (val, 23, 23);	/* sign bit */
+      f = EXTRU (val, 22, 0);	/* mantissa */
+      if (s)
+	f += -2 * (1 << 23);
+      else
+	f += (1 << 23);
+      num = f / (double)(1 << 23);
+      num = ldexp (num, e);
+    }    
+  (*pfunc)(stream, "%.9g", num);
+}
+
+static int
+c4x_print_immed (struct disassemble_info *info,
+		 immed_t type,
+		 unsigned long arg)
+{
+  int s;
+  int f;
+  int e;
+  double num = 0.0;
+  
+  if (info == NULL)
+    return 1;
+  switch (type)
+    {
+    case IMMED_SINT:
+    case IMMED_INT:
+      (*info->fprintf_func) (info->stream, "%d", (long)arg);
+      break;
+      
+    case IMMED_SUINT:
+    case IMMED_UINT:
+      (*info->fprintf_func) (info->stream, "%u", arg);
+      break;
+      
+    case IMMED_SFLOAT:
+      e = EXTRS (arg, 15, 12);
+      if (e != -8)
+	{
+	  s = EXTRU (arg, 11, 11);
+	  f = EXTRU (arg, 10, 0);
+	  if (s)
+	    f += -2 * (1 << 11);
+	  else
+	    f += (1 << 11);
+	  num = f / (double)(1 << 11);
+	  num = ldexp (num, e);
+	}
+      (*info->fprintf_func) (info->stream, "%f", num);
+      break;
+    case IMMED_FLOAT:
+      e = EXTRS (arg, 31, 24);
+      if (e != -128)
+	{
+	  s = EXTRU (arg, 23, 23);
+	  f = EXTRU (arg, 22, 0);
+	  if (s)
+	    f += -2 * (1 << 23);
+	  else
+	    f += (1 << 23);
+	  num = f / (double)(1 << 23);
+	  num = ldexp (num, e);
+	}
+      (*info->fprintf_func) (info->stream, "%f", num);
+      break;
+    }
+  return 1;
+}
+
+static int
+c4x_print_cond (struct disassemble_info *info,
+		unsigned int cond)
+{
+  static c4x_cond_t **condtable = NULL;
+  unsigned int i;
+  
+  if (condtable == NULL)
+    {
+      condtable = (c4x_cond_t **)xmalloc (sizeof (c4x_cond_t *) * 32);
+      for (i = 0; i < num_conds; i++)
+	condtable[c4x_conds[i].cond] = (void *)&c4x_conds[i];
+    }
+  if (cond > 31 || condtable[cond] == NULL)
+    return 0;
+  if (info != NULL)
+    (*info->fprintf_func) (info->stream, "%s", condtable[cond]->name);
+  return 1;
+}
+
+static int
+c4x_print_indirect (struct disassemble_info *info,
+		    indirect_t type,
+		    unsigned long arg)
+{
+  unsigned int aregno;
+  unsigned int modn;
+  unsigned int disp;
+  char *a;
+
+  aregno = 0;
+  modn = 0;
+  disp = 1;
+  switch(type)
+    {
+    case INDIRECT_C4X:		/* *+ARn(disp) */
+      disp = EXTRU (arg, 7, 3);
+      aregno = EXTRU (arg, 2, 0) + REG_AR0;
+      modn = 0;
+      break;
+    case INDIRECT_SHORT:
+      disp = 1;
+      aregno = EXTRU (arg, 2, 0) + REG_AR0;
+      modn = EXTRU (arg, 7, 3);
+      break;
+    case INDIRECT_LONG:
+      disp = EXTRU (arg, 7, 0);
+      aregno = EXTRU (arg, 10, 8) + REG_AR0;
+      modn = EXTRU (arg, 15, 11);
+      if (modn > 7 && disp != 0)
+	return 0;
+      break;
+    default:
+      abort ();
+    }
+  if (modn > C3X_MODN_MAX)
+    return 0;
+  a = c4x_indirects[modn].name;
+  while (*a)
+    {
+      switch (*a)
+	{
+	case 'a':
+	  c4x_print_register (info, aregno);
+	  break;
+	case 'd':
+	  c4x_print_immed (info, IMMED_UINT, disp);
+	  break;
+	case 'y':
+	  c4x_print_str (info, "ir0");
+	  break;
+	case 'z':
+	  c4x_print_str (info, "ir1");
+	  break;
+	default:
+	  c4x_print_char (info, *a);
+	  break;
+	}
+      a++;
+    }
+  return 1;
+}
+
+static int
+c4x_print_op (struct disassemble_info *info,
+	      unsigned long instruction,
+	      c4x_inst_t *p, unsigned long pc)
+{
+  int val;
+  char *s;
+  char *parallel = NULL;
+
+  /* Print instruction name.  */
+  s = p->name;
+  while (*s && parallel == NULL)
+    {
+      switch (*s)
+	{
+	case 'B':
+	  if (! c4x_print_cond (info, EXTRU (instruction, 20, 16)))
+	    return 0;
+	  break;
+	case 'C':
+	  if (! c4x_print_cond (info, EXTRU (instruction, 27, 23)))
+	    return 0;
+	  break;
+	case '_':
+	  parallel = s + 1;	/* Skip past `_' in name */
+	  break;
+	default:
+	  c4x_print_char (info, *s);
+	  break;
+	}
+      s++;
+    }
+  
+  /* Print arguments.  */
+  s = p->args;
+  if (*s)
+    c4x_print_char (info, ' ');
+
+  while (*s)
+    {
+      switch (*s)
+	{
+	case '*': /* indirect 0--15 */
+	  if (! c4x_print_indirect (info, INDIRECT_LONG,
+				    EXTRU (instruction, 15, 0)))
+	    return 0;
+	  break;
+
+	case '#': /* only used for ldp, ldpk */
+	  c4x_print_immed (info, IMMED_UINT, EXTRU (instruction, 15, 0));
+	  break;
+
+	case '@': /* direct 0--15 */
+	  c4x_print_direct (info, EXTRU (instruction, 15, 0));
+	  break;
+
+	case 'A': /* address register 24--22 */
+	  if (! c4x_print_register (info, EXTRU (instruction, 24, 22) +
+				    REG_AR0))
+	    return 0;
+	  break;
+
+	case 'B': /* 24-bit unsigned int immediate br(d)/call/rptb
+		     address 0--23.  */
+	  if (IS_CPU_C4X (c4x_version))
+	    c4x_print_relative (info, pc, EXTRS (instruction, 23, 0),
+				p->opcode);
+	  else
+	    c4x_print_addr (info, EXTRU (instruction, 23, 0));
+	  break;
+
+	case 'C': /* indirect (short C4x) 0--7 */
+	  if (! IS_CPU_C4X (c4x_version))
+	    return 0;
+	  if (! c4x_print_indirect (info, INDIRECT_C4X,
+				    EXTRU (instruction, 7, 0)))
+	    return 0;
+	  break;
+
+	case 'D':
+	  /* Cockup if get here...  */
+	  break;
+
+	case 'E': /* register 0--7 */
+	  if (! c4x_print_register (info, EXTRU (instruction, 7, 0)))
+	    return 0;
+	  break;
+
+	case 'F': /* 16-bit float immediate 0--15 */
+	  c4x_print_immed (info, IMMED_SFLOAT,
+			   EXTRU (instruction, 15, 0));
+	  break;
+
+	case 'I': /* indirect (short) 0--7 */
+	  if (! c4x_print_indirect (info, INDIRECT_SHORT,
+				    EXTRU (instruction, 7, 0)))
+	    return 0;
+	  break;
+
+	case 'J': /* indirect (short) 8--15 */
+	  if (! c4x_print_indirect (info, INDIRECT_SHORT,
+				    EXTRU (instruction, 15, 8)))
+	    return 0;
+	  break;
+
+	case 'G': /* register 8--15 */
+	  if (! c4x_print_register (info, EXTRU (instruction, 15, 8)))
+	    return 0;
+	  break;
+
+	case 'H': /* register 16--18 */
+	  if (! c4x_print_register (info, EXTRU (instruction, 18, 16)))
+	    return 0;
+	  break;
+
+	case 'K': /* register 19--21 */
+	  if (! c4x_print_register (info, EXTRU (instruction, 21, 19)))
+	    return 0;
+	  break;
+
+	case 'L': /* register 22--24 */
+	  if (! c4x_print_register (info, EXTRU (instruction, 24, 22)))
+	    return 0;
+	  break;
+
+	case 'M': /* register 22--22 */
+	  c4x_print_register (info, EXTRU (instruction, 22, 22) + REG_R2);
+	  break;
+
+	case 'N': /* register 23--23 */
+	  c4x_print_register (info, EXTRU (instruction, 22, 22) + REG_R0);
+	  break;
+
+	case 'O': /* indirect (short C4x) 8--15 */
+	  if (! IS_CPU_C4X (c4x_version))
+	    return 0;
+	  if (! c4x_print_indirect (info, INDIRECT_C4X,
+				    EXTRU (instruction, 15, 8)))
+	    return 0;
+	  break;
+
+	case 'P': /* displacement 0--15 (used by Bcond and BcondD) */
+	  c4x_print_relative (info, pc, EXTRS (instruction, 15, 0),
+			      p->opcode);
+	  break;
+
+	case 'Q': /* register 0--15 */
+	  if (! c4x_print_register (info, EXTRU (instruction, 15, 0)))
+	    return 0;
+	  break;
+
+	case 'R': /* register 16--20 */
+	  if (! c4x_print_register (info, EXTRU (instruction, 20, 16)))
+	    return 0;
+	  break;
+
+	case 'S': /* 16-bit signed immediate 0--15 */
+	  c4x_print_immed (info, IMMED_SINT,
+			   EXTRS (instruction, 15, 0));
+	  break;
+
+	case 'T': /* 5-bit signed immediate 16--20  (C4x stik) */
+	  if (! IS_CPU_C4X (c4x_version))
+	    return 0;
+	  if (! c4x_print_immed (info, IMMED_SUINT,
+				 EXTRU (instruction, 20, 16)))
+	    return 0;
+	  break;
+
+	case 'U': /* 16-bit unsigned int immediate 0--15 */
+	  c4x_print_immed (info, IMMED_SUINT, EXTRU (instruction, 15, 0));
+	  break;
+
+	case 'V': /* 5/9-bit unsigned vector 0--4/8 */
+	  c4x_print_immed (info, IMMED_SUINT,
+			   IS_CPU_C4X (c4x_version) ? 
+			   EXTRU (instruction, 8, 0) :
+			   EXTRU (instruction, 4, 0) & ~0x20);
+	  break;
+
+	case 'W': /* 8-bit signed immediate 0--7 */
+	  if (! IS_CPU_C4X (c4x_version))
+	    return 0;
+	  c4x_print_immed (info, IMMED_SINT, EXTRS (instruction, 7, 0));
+	  break;
+
+	case 'X': /* expansion register 4--0 */
+	  val = EXTRU (instruction, 4, 0) + REG_IVTP;
+	  if (val < REG_IVTP || val > REG_TVTP)
+	    return 0;
+	  if (! c4x_print_register (info, val))
+	    return 0;
+	  break;
+
+	case 'Y': /* address register 16--20 */
+	  val = EXTRU (instruction, 20, 16);
+	  if (val < REG_AR0 || val > REG_SP)
+	    return 0;
+	  if (! c4x_print_register (info, val))
+	    return 0;
+	  break;
+
+	case 'Z': /* expansion register 16--20 */
+	  val = EXTRU (instruction, 20, 16) + REG_IVTP;
+	  if (val < REG_IVTP || val > REG_TVTP)
+	    return 0;
+	  if (! c4x_print_register (info, val))
+	    return 0;
+	  break;
+
+	case '|':		/* Parallel instruction */
+	  c4x_print_str (info, " || ");
+	  c4x_print_str (info, parallel);
+	  c4x_print_char (info, ' ');
+	  break;
+
+	case ';':
+	  c4x_print_char (info, ',');
+	  break;
+
+	default:
+	  c4x_print_char (info, *s);
+	  break;
+	}
+      s++;
+    }
+  return 1;
+}
+
+static void
+c4x_hash_opcode (c4x_inst_t **optable,
+		 const c4x_inst_t *inst)
+{
+  int j;
+  int opcode = inst->opcode >> (32 - C4X_HASH_SIZE);
+  int opmask = inst->opmask >> (32 - C4X_HASH_SIZE);
+  
+  /* Use a C4X_HASH_SIZE bit index as a hash index.  We should
+     have unique entries so there's no point having a linked list
+     for each entry? */
+  for (j = opcode; j < opmask; j++)
+    if ((j & opmask) == opcode)
+      {
+#if C4X_DEBUG
+	/* We should only have collisions for synonyms like
+	   ldp for ldi.  */
+	if (optable[j] != NULL)
+	  printf("Collision at index %d, %s and %s\n",
+		 j, optable[j]->name, inst->name);
+#endif
+	optable[j] = (void *)inst;
+      }
+}
+
+/* Disassemble the instruction in 'instruction'.
+   'pc' should be the address of this instruction, it will
+   be used to print the target address if this is a relative jump or call
+   the disassembled instruction is written to 'info'.
+   The function returns the length of this instruction in words.  */
+
+static int
+c4x_disassemble (unsigned long pc,
+		 unsigned long instruction,
+		 struct disassemble_info *info)
+{
+  static c4x_inst_t **optable = NULL;
+  c4x_inst_t *p;
+  int i;
+  
+  c4x_version = info->mach;
+  
+  if (optable == NULL)
+    {
+      optable = (c4x_inst_t **)
+	xcalloc (sizeof (c4x_inst_t *), (1 << C4X_HASH_SIZE));
+      /* Install opcodes in reverse order so that preferred
+	 forms overwrite synonyms.  */
+      for (i = c3x_num_insts - 1; i >= 0; i--)
+	c4x_hash_opcode (optable, &c3x_insts[i]);
+      if (IS_CPU_C4X (c4x_version))
+	{
+	  for (i = c4x_num_insts - 1; i >= 0; i--)
+	    c4x_hash_opcode (optable, &c4x_insts[i]);
+	}
+    }
+  
+  /* See if we can pick up any loading of the DP register...  */
+  if ((instruction >> 16) == 0x5070 || (instruction >> 16) == 0x1f70)
+    c4x_dp = EXTRU (instruction, 15, 0);
+  
+  p = optable[instruction >> (32 - C4X_HASH_SIZE)];
+  if (p != NULL && ((instruction & p->opmask) == p->opcode)
+      && c4x_print_op (NULL, instruction, p, pc))
+    c4x_print_op (info, instruction, p, pc);
+  else
+    (*info->fprintf_func) (info->stream, "%08x", instruction);
+
+  /* Return size of insn in words.  */
+  return 1;	
+}
+
+/* The entry point from objdump and gdb.  */
+int
+print_insn_tic4x (memaddr, info)
+     bfd_vma memaddr;
+     struct disassemble_info *info;
+{
+  int status;
+  unsigned long pc;
+  unsigned long op;
+  bfd_byte buffer[4];
+  
+  status = (*info->read_memory_func) (memaddr, buffer, 4, info);
+  if (status != 0)
+    {
+      (*info->memory_error_func) (status, memaddr, info);
+      return -1;
+    }
+  
+  pc = memaddr;
+  op = bfd_getl32 (buffer);
+  info->bytes_per_line = 4;
+  info->bytes_per_chunk = 4;
+  info->octets_per_byte = 4;
+  info->display_endian = BFD_ENDIAN_LITTLE;
+  return c4x_disassemble (pc, op, info) * 4;
+}