Add IBM 370 support.

1 files changed, 167 insertions, 0 deletions

diff --git a/opcodes/i370-dis.c b/opcodes/i370-dis.c
new file mode 100644
index 00000000000..a992c7635d2
--- /dev/null
+++ b/opcodes/i370-dis.c
@@ -0,0 +1,167 @@
+
+/* i370-dis.c -- Disassemble Instruction 370 (ESA/390) instructions
+   Copyright 1994, 2000 Free Software Foundation, Inc.
+   PowerPC version written by Ian Lance Taylor, Cygnus Support
+   Rewritten for i370 ESA/390 support by Linas Vepstas <linas@linas.org>
+
+This file is part of GDB, GAS, and the GNU binutils.
+
+GDB, GAS, and the GNU binutils are free software; you can redistribute
+them and/or modify them under the terms of the GNU General Public
+License as published by the Free Software Foundation; either version
+2, or (at your option) any later version.
+
+GDB, GAS, and the GNU binutils are distributed in the hope that they
+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 file; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include <stdio.h>
+#include "ansidecl.h"
+#include "sysdep.h"
+#include "dis-asm.h"
+#include "opcode/i370.h"
+
+/* This file provides several disassembler functions, all of which use
+   the disassembler interface defined in dis-asm.h.
+*/
+
+int
+print_insn_i370 (memaddr, info)
+     bfd_vma memaddr;
+     struct disassemble_info *info;
+{
+  bfd_byte buffer[8];
+  int status;
+  i370_insn_t insn;
+  const struct i370_opcode *opcode;
+  const struct i370_opcode *opcode_end;
+
+  status = (*info->read_memory_func) (memaddr, buffer, 6, info);
+  if (status != 0)
+    {
+      (*info->memory_error_func) (status, memaddr, info);
+      return -1;
+    }
+
+  /* Cast the bytes into the insn (in a host-endian indep way) */
+  insn.i[0] = (buffer[0] << 24) & 0xff000000;
+  insn.i[0] |= (buffer[1] << 16) & 0xff0000;
+  insn.i[0] |= (buffer[2] << 8) & 0xff00;
+  insn.i[0] |= buffer[3]  & 0xff;
+  insn.i[1] = (buffer[4] << 24) & 0xff000000;
+  insn.i[1] |= (buffer[5] << 16) & 0xff0000;
+
+  /* Find the first match in the opcode table.  We could speed this up
+     a bit by doing a binary search on the major opcode.  */
+  opcode_end = i370_opcodes + i370_num_opcodes;
+  for (opcode = i370_opcodes; opcode < opcode_end; opcode++)
+    {
+      const unsigned char *opindex;
+      const struct i370_operand *operand;
+      i370_insn_t masked;
+      int invalid;
+
+      /* Mask off operands, and look for a match ... */
+      masked = insn;
+      if (2 == opcode->len)
+        {
+          masked.i[0] >>= 16;
+          masked.i[0] &= 0xffff;
+        }
+      masked.i[0] &= opcode->mask.i[0];
+      if (masked.i[0] != opcode->opcode.i[0]) continue;
+
+      if (6 == opcode->len)
+        {
+          masked.i[1] &= opcode->mask.i[1];
+          if (masked.i[1] != opcode->opcode.i[1]) continue;
+        }
+
+      /* Found a match.  adjust a tad */
+      if (2 == opcode->len)
+        {
+          insn.i[0] >>= 16;
+          insn.i[0] &= 0xffff;
+        }
+
+      /* Make two passes over the operands.  First see if any of them
+         have extraction functions, and, if they do, make sure the
+         instruction is valid.  */
+      invalid = 0;
+      for (opindex = opcode->operands; *opindex != 0; opindex++)
+        {
+          operand = i370_operands + *opindex;
+          if (operand->extract)
+            (*operand->extract) (insn, &invalid);
+        }
+      if (invalid) continue;
+
+      /* The instruction is valid.  */
+      (*info->fprintf_func) (info->stream, "%s", opcode->name);
+      if (opcode->operands[0] != 0)
+        (*info->fprintf_func) (info->stream, "\t");
+
+      /* Now extract and print the operands.  */
+      for (opindex = opcode->operands; *opindex != 0; opindex++)
+        {
+          long value;
+
+          operand = i370_operands + *opindex;
+
+          /* Extract the value from the instruction.  */
+          if (operand->extract)
+            value = (*operand->extract) (insn, (int *) NULL);
+          else
+            {
+              value = (insn.i[0] >> operand->shift) & ((1 << operand->bits) - 1);
+            }
+
+          /* Print the operand as directed by the flags.  */
+          if ((operand->flags & I370_OPERAND_OPTIONAL) != 0)
+            {
+              if (value)
+                (*info->fprintf_func) (info->stream, "(r%ld)", value);
+            }
+          else if ((operand->flags & I370_OPERAND_SBASE) != 0)
+            {
+              (*info->fprintf_func) (info->stream, "(r%ld)", value);
+            }
+          else if ((operand->flags & I370_OPERAND_INDEX) != 0)
+            {
+              if (value)
+                (*info->fprintf_func) (info->stream, "(r%ld,", value);
+              else
+                (*info->fprintf_func) (info->stream, "(,");
+            }
+          else if ((operand->flags & I370_OPERAND_LENGTH) != 0)
+            {
+              (*info->fprintf_func) (info->stream, "(%ld,", value);
+            }
+          else if ((operand->flags & I370_OPERAND_BASE) != 0)
+            (*info->fprintf_func) (info->stream, "r%ld)", value);
+          else if ((operand->flags & I370_OPERAND_GPR) != 0)
+            (*info->fprintf_func) (info->stream, "r%ld,", value);
+          else if ((operand->flags & I370_OPERAND_FPR) != 0)
+            (*info->fprintf_func) (info->stream, "f%ld,", value);
+          else if ((operand->flags & I370_OPERAND_RELATIVE) != 0)
+            (*info->fprintf_func) (info->stream, "%ld", value);
+          else
+            (*info->fprintf_func) (info->stream, " %ld, ", value);
+
+        }
+
+      return opcode->len;
+
+    }
+
+
+  /* We could not find a match.  */
+  (*info->fprintf_func) (info->stream, ".short 0x%02x%02x", buffer[0], buffer[1]);
+
+  return 2;
+}