X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=opcodes%2Fs390-dis.c;h=282565a606e9c918205f2fea2ef59995b2c85373;hb=ed34ef5ed3b11141a622e3edfb0c47e790f1fea7;hp=6409d5fcfef8ad67688d908dde1f2c1d8b72292a;hpb=a85d7ed0f0b65504f7d8027319d1a4a9adb9d8c1;p=platform%2Fupstream%2Fbinutils.git

diff --git a/opcodes/s390-dis.c b/opcodes/s390-dis.c
index 6409d5f..282565a 100644
--- a/opcodes/s390-dis.c
+++ b/opcodes/s390-dis.c
@@ -1,231 +1,319 @@
 /* s390-dis.c -- Disassemble S390 instructions
-   Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+   Copyright (C) 2000-2014 Free Software Foundation, Inc.
    Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
 
-   This file is part of GDB, GAS and the GNU binutils.
+   This file is part of the GNU opcodes library.
 
-   This program is free software; you can redistribute it and/or modify
+   This library 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.
+   the Free Software Foundation; either version 3, 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.
+   It 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.  */
+   along with this file; see the file COPYING.  If not, write to the
+   Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
 
+#include "sysdep.h"
 #include <stdio.h>
 #include "ansidecl.h"
-#include "sysdep.h"
 #include "dis-asm.h"
+#include "opintl.h"
 #include "opcode/s390.h"
 
 static int init_flag = 0;
 static int opc_index[256];
 static int current_arch_mask = 0;
 
-/* Set up index table for first opcode byte */
-static void 
-init_disasm(info)
-    struct disassemble_info *info ATTRIBUTE_UNUSED;
+/* Set up index table for first opcode byte.  */
+
+static void
+init_disasm (struct disassemble_info *info)
 {
-  const struct s390_opcode *opcode;
-  const struct s390_opcode *opcode_end;
-
-  memset(opc_index, 0, sizeof(opc_index));
-  opcode_end = s390_opcodes + s390_num_opcodes;
-  for (opcode = s390_opcodes; opcode < opcode_end; opcode++) {
-    opc_index[(int) opcode->opcode[0]] = opcode - s390_opcodes;
-    while ((opcode < opcode_end) && 
-           (opcode[1].opcode[0] == opcode->opcode[0]))
-      opcode++;
-  }
-  switch (info->mach) {
-  case bfd_mach_s390_esa:
-    current_arch_mask = 1 << S390_OPCODE_ESA;
-    break;
-  case bfd_mach_s390_esame:
-    current_arch_mask = 1 << S390_OPCODE_ESAME;
-    break;
-  default:
-    abort();
-  }
+  int i;
+  const char *p;
+
+  memset (opc_index, 0, sizeof (opc_index));
+
+  /* Reverse order, such that each opc_index ends up pointing to the
+     first matching entry instead of the last.  */
+  for (i = s390_num_opcodes; i--; )
+    opc_index[s390_opcodes[i].opcode[0]] = i;
+
+  for (p = info->disassembler_options; p != NULL; )
+    {
+      if (CONST_STRNEQ (p, "esa"))
+	current_arch_mask = 1 << S390_OPCODE_ESA;
+      else if (CONST_STRNEQ (p, "zarch"))
+	current_arch_mask = 1 << S390_OPCODE_ZARCH;
+      else
+	fprintf (stderr, "Unknown S/390 disassembler option: %s\n", p);
+
+      p = strchr (p, ',');
+      if (p != NULL)
+	p++;
+    }
+
+  if (!current_arch_mask)
+    current_arch_mask = 1 << S390_OPCODE_ZARCH;
+
   init_flag = 1;
 }
 
+/* Derive the length of an instruction from its first byte.  */
+
+static inline int
+s390_insn_length (const bfd_byte *buffer)
+{
+  /* 00xxxxxx -> 2, 01xxxxxx/10xxxxxx -> 4, 11xxxxxx -> 6.  */
+  return ((buffer[0] >> 6) + 3) & ~1U;
+}
+
+/* Match the instruction in BUFFER against the given OPCODE, excluding
+   the first byte.  */
+
+static inline int
+s390_insn_matches_opcode (const bfd_byte *buffer,
+			  const struct s390_opcode *opcode)
+{
+  return (buffer[1] & opcode->mask[1]) == opcode->opcode[1]
+    && (buffer[2] & opcode->mask[2]) == opcode->opcode[2]
+    && (buffer[3] & opcode->mask[3]) == opcode->opcode[3]
+    && (buffer[4] & opcode->mask[4]) == opcode->opcode[4]
+    && (buffer[5] & opcode->mask[5]) == opcode->opcode[5];
+}
+
+union operand_value
+{
+  int i;
+  unsigned int u;
+};
+
 /* Extracts an operand value from an instruction.  */
+/* We do not perform the shift operation for larl-type address
+   operands here since that would lead to an overflow of the 32 bit
+   integer value.  Instead the shift operation is done when printing
+   the operand.  */
 
-static inline unsigned int
-s390_extract_operand (insn, operand)
-     unsigned char *insn;
-     const struct s390_operand *operand;
+static inline union operand_value
+s390_extract_operand (const bfd_byte *insn,
+		      const struct s390_operand *operand)
 {
+  union operand_value ret;
   unsigned int val;
   int bits;
 
-  /* extract fragments of the operand byte for byte */
-  insn += operand->shift/8;
+  /* Extract fragments of the operand byte for byte.  */
+  insn += operand->shift / 8;
   bits = (operand->shift & 7) + operand->bits;
   val = 0;
-  do {
-    val <<= 8;
-    val |= (unsigned int) *insn++;
-    bits -= 8;
-  } while (bits > 0);
+  do
+    {
+      val <<= 8;
+      val |= (unsigned int) *insn++;
+      bits -= 8;
+    }
+  while (bits > 0);
   val >>= -bits;
-  val &= ((1U << (operand->bits-1))<<1) - 1;
-
-  /* sign extend value if the operand is signed or pc relative */
-  if ((operand->flags & (S390_OPERAND_SIGNED|S390_OPERAND_PCREL)) &&
-      (val & (1U << (operand->bits-1))))
-    val |= (-1U << (operand->bits-1))<<1;
- 
-  /* double value if the operand is pc relative */
-  if (operand->flags & S390_OPERAND_PCREL)
-    val <<= 1;
- 
-  /* length x in an instructions has real length x+1 */
-  if (operand->flags & S390_OPERAND_LENGTH)
-    val++;
-  return val;
+  val &= ((1U << (operand->bits - 1)) << 1) - 1;
+
+  /* Check for special long displacement case.  */
+  if (operand->bits == 20 && operand->shift == 20)
+    val = (val & 0xff) << 12 | (val & 0xfff00) >> 8;
+
+  /* Sign extend value if the operand is signed or pc relative.  Avoid
+     integer overflows.  */
+  if (operand->flags & (S390_OPERAND_SIGNED | S390_OPERAND_PCREL))
+    {
+      unsigned int m = 1U << (operand->bits - 1);
+
+      if (val >= m)
+	ret.i = (int) (val - m) - 1 - (int) (m - 1U);
+      else
+	ret.i = (int) val;
+    }
+  else if (operand->flags & S390_OPERAND_LENGTH)
+    /* Length x in an instruction has real length x + 1.  */
+    ret.u = val + 1;
+  else
+    ret.u = val;
+
+  return ret;
+}
+
+/* Print the S390 instruction in BUFFER, assuming that it matches the
+   given OPCODE.  */
+
+static void
+s390_print_insn_with_opcode (bfd_vma memaddr,
+			     struct disassemble_info *info,
+			     const bfd_byte *buffer,
+			     const struct s390_opcode *opcode)
+{
+  const unsigned char *opindex;
+  char separator;
+
+  /* Mnemonic.  */
+  info->fprintf_func (info->stream, "%s", opcode->name);
+
+  /* Operands.  */
+  separator = '\t';
+  for (opindex = opcode->operands; *opindex != 0; opindex++)
+    {
+      const struct s390_operand *operand = s390_operands + *opindex;
+      union operand_value val = s390_extract_operand (buffer, operand);
+      unsigned long flags = operand->flags;
+
+      if ((flags & S390_OPERAND_INDEX) && val.u == 0)
+	continue;
+      if ((flags & S390_OPERAND_BASE) &&
+	  val.u == 0 && separator == '(')
+	{
+	  separator = ',';
+	  continue;
+	}
+
+      info->fprintf_func (info->stream, "%c", separator);
+
+      if (flags & S390_OPERAND_GPR)
+	info->fprintf_func (info->stream, "%%r%u", val.u);
+      else if (flags & S390_OPERAND_FPR)
+	info->fprintf_func (info->stream, "%%f%u", val.u);
+      else if (flags & S390_OPERAND_AR)
+	info->fprintf_func (info->stream, "%%a%u", val.u);
+      else if (flags & S390_OPERAND_CR)
+	info->fprintf_func (info->stream, "%%c%u", val.u);
+      else if (flags & S390_OPERAND_PCREL)
+	info->print_address_func (memaddr + val.i + val.i, info);
+      else if (flags & S390_OPERAND_SIGNED)
+	info->fprintf_func (info->stream, "%i", val.i);
+      else
+	info->fprintf_func (info->stream, "%u", val.u);
+
+      if (flags & S390_OPERAND_DISP)
+	separator = '(';
+      else if (flags & S390_OPERAND_BASE)
+	{
+	  info->fprintf_func (info->stream, ")");
+	  separator = ',';
+	}
+      else
+	separator = ',';
+    }
+}
+
+/* Check whether opcode A's mask is more specific than that of B.  */
+
+static int
+opcode_mask_more_specific (const struct s390_opcode *a,
+			   const struct s390_opcode *b)
+{
+  return (((int) a->mask[0] + a->mask[1] + a->mask[2]
+	   + a->mask[3] + a->mask[4] + a->mask[5])
+	  > ((int) b->mask[0] + b->mask[1] + b->mask[2]
+	     + b->mask[3] + b->mask[4] + b->mask[5]));
 }
 
 /* Print a S390 instruction.  */
 
 int
-print_insn_s390 (memaddr, info)
-     bfd_vma memaddr;
-     struct disassemble_info *info;
+print_insn_s390 (bfd_vma memaddr, struct disassemble_info *info)
 {
   bfd_byte buffer[6];
-  const struct s390_opcode *opcode;
-  const struct s390_opcode *opcode_end;
+  const struct s390_opcode *opcode = NULL;
   unsigned int value;
   int status, opsize, bufsize;
-  char separator;
 
   if (init_flag == 0)
-    init_disasm(info);
+    init_disasm (info);
 
   /* The output looks better if we put 6 bytes on a line.  */
   info->bytes_per_line = 6;
 
   /* Every S390 instruction is max 6 bytes long.  */
-  memset(buffer, 0, 6);
-  status = (*info->read_memory_func) (memaddr, buffer, 6, info);
-  if (status != 0) {
-    for (bufsize = 0; bufsize < 6; bufsize++)
-      if ((*info->read_memory_func) (memaddr, buffer, bufsize+1, info) != 0)
-        break;
-    if (bufsize <= 0) {
-      (*info->memory_error_func) (status, memaddr, info);
-      return -1;
+  memset (buffer, 0, 6);
+  status = info->read_memory_func (memaddr, buffer, 6, info);
+  if (status != 0)
+    {
+      for (bufsize = 0; bufsize < 6; bufsize++)
+	if (info->read_memory_func (memaddr, buffer, bufsize + 1, info) != 0)
+	  break;
+      if (bufsize <= 0)
+	{
+	  info->memory_error_func (status, memaddr, info);
+	  return -1;
+	}
+      opsize = s390_insn_length (buffer);
+      status = opsize > bufsize;
+    }
+  else
+    {
+      bufsize = 6;
+      opsize = s390_insn_length (buffer);
     }
-    /* Opsize calculation looks strange but it works
-       00xxxxxx -> 2 bytes, 01xxxxxx/10xxxxxx -> 4 bytes, 
-       11xxxxxx -> 6 bytes.  */
-    opsize = ((((buffer[0]>>6)+1)>>1)+1)<<1;
-    status = opsize > bufsize;
-  } else {
-    bufsize = 6;
-    opsize = ((((buffer[0]>>6)+1)>>1)+1)<<1;
-  }
-
-  if (status == 0) {
-    /* Find the first match in the opcode table.  */
-    opcode_end = s390_opcodes + s390_num_opcodes;
-    for (opcode = s390_opcodes + opc_index[(int) buffer[0]]; 
-         (opcode < opcode_end) && (buffer[0] == opcode->opcode[0]);
-         opcode++) {
-      const struct s390_operand *operand;
-      const unsigned char *opindex;
-
-      /* check architecture */
-      if (!(opcode->architecture & current_arch_mask))
-        continue;
-      /* check signature of the opcode */
-      if ((buffer[1] & opcode->mask[1]) != opcode->opcode[1] ||
-          (buffer[2] & opcode->mask[2]) != opcode->opcode[2] ||
-          (buffer[3] & opcode->mask[3]) != opcode->opcode[3] ||
-          (buffer[4] & opcode->mask[4]) != opcode->opcode[4] ||
-          (buffer[5] & opcode->mask[5]) != opcode->opcode[5])
-        continue;
-  
-      /* the instruction is valid */
-      if (opcode->operands[0] != 0)
-        (*info->fprintf_func) (info->stream, "%s\t", opcode->name);
-      else
-        (*info->fprintf_func) (info->stream, "%s", opcode->name);
-  
-      /* Extract the operands.  */
-      separator = 0;
-      for (opindex = opcode->operands; *opindex != 0; opindex++) {
-        unsigned int value;
-
-        operand = s390_operands + *opindex;
-        value = s390_extract_operand(buffer, operand);
-
-        if ((operand->flags & S390_OPERAND_INDEX) && value == 0)
-          continue;
-        if ((operand->flags & S390_OPERAND_BASE) && 
-            value == 0 && separator == '(') {
-          separator = ',';
-          continue;
-        }
-
-        if (separator)
-          (*info->fprintf_func) (info->stream, "%c", separator);
-
-        if (operand->flags & S390_OPERAND_GPR)
-          (*info->fprintf_func) (info->stream, "%%r%i", value);
-        else if (operand->flags & S390_OPERAND_FPR)
-          (*info->fprintf_func) (info->stream, "%%f%i", value);
-        else if (operand->flags & S390_OPERAND_AR)
-          (*info->fprintf_func) (info->stream, "%%a%i", value);
-        else if (operand->flags & S390_OPERAND_CR)
-          (*info->fprintf_func) (info->stream, "%%c%i", value);
-        else if (operand->flags & S390_OPERAND_PCREL)
-          (*info->print_address_func) (memaddr + (int) value, info);
-        else if (operand->flags & S390_OPERAND_SIGNED)
-          (*info->fprintf_func) (info->stream, "%i", (int) value);
-        else
-	  (*info->fprintf_func) (info->stream, "%i", value);
-
-        if (operand->flags & S390_OPERAND_DISP) {
-	  separator = '(';
-        } else if (operand->flags & S390_OPERAND_BASE) {
-	  (*info->fprintf_func) (info->stream, ")");
-          separator = ',';
-        } else
-	  separator = ',';
-      }
 
-      /* found instruction, printed it, return its size */
+  if (status == 0)
+    {
+      const struct s390_opcode *op;
+
+      /* Find the "best match" in the opcode table.  */
+      for (op = s390_opcodes + opc_index[buffer[0]];
+	   op != s390_opcodes + s390_num_opcodes
+	     && op->opcode[0] == buffer[0];
+	   op++)
+	{
+	  if ((op->modes & current_arch_mask)
+	      && s390_insn_matches_opcode (buffer, op)
+	      && (opcode == NULL
+		  || opcode_mask_more_specific (op, opcode)))
+	    opcode = op;
+	}
+    }
+
+  if (opcode != NULL)
+    {
+      /* The instruction is valid.  Print it and return its size.  */
+      s390_print_insn_with_opcode (memaddr, info, buffer, opcode);
       return opsize;
     }
-    /* no matching instruction found, fall through to hex print  */
-  }
-
-  if (bufsize >= 4) {
-    value = (unsigned int) buffer[0];
-    value = (value << 8) + (unsigned int) buffer[1];
-    value = (value << 8) + (unsigned int) buffer[2];
-    value = (value << 8) + (unsigned int) buffer[3];
-    (*info->fprintf_func) (info->stream,".long\t0x%08x", value);
-    return 4;
-  } else if (bufsize >= 2) {
-    value = (unsigned int) buffer[0];
-    value = (value << 8) + (unsigned int) buffer[1];
-    (*info->fprintf_func) (info->stream,".short\t0x%04x", value);
-    return 2;
-  } else {
-    value = (unsigned int) buffer[0];
-    (*info->fprintf_func) (info->stream,".byte\t0x%02x", value);
-    return 1;
-  }
+
+  /* Fall back to hex print.  */
+  if (bufsize >= 4)
+    {
+      value = (unsigned int) buffer[0];
+      value = (value << 8) + (unsigned int) buffer[1];
+      value = (value << 8) + (unsigned int) buffer[2];
+      value = (value << 8) + (unsigned int) buffer[3];
+      info->fprintf_func (info->stream, ".long\t0x%08x", value);
+      return 4;
+    }
+  else if (bufsize >= 2)
+    {
+      value = (unsigned int) buffer[0];
+      value = (value << 8) + (unsigned int) buffer[1];
+      info->fprintf_func (info->stream, ".short\t0x%04x", value);
+      return 2;
+    }
+  else
+    {
+      value = (unsigned int) buffer[0];
+      info->fprintf_func (info->stream, ".byte\t0x%02x", value);
+      return 1;
+    }
+}
+
+void
+print_s390_disassembler_options (FILE *stream)
+{
+  fprintf (stream, _("\n\
+The following S/390 specific disassembler options are supported for use\n\
+with the -M switch (multiple options should be separated by commas):\n"));
+
+  fprintf (stream, _("  esa         Disassemble in ESA architecture mode\n"));
+  fprintf (stream, _("  zarch       Disassemble in z/Architecture mode\n"));
 }