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+
+/* 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;
+}