Add s390 support

1 files changed, 231 insertions, 0 deletions

diff --git a/opcodes/s390-dis.c b/opcodes/s390-dis.c
new file mode 100644
index 00000000000..6409d5fcfef
--- /dev/null
+++ b/opcodes/s390-dis.c
@@ -0,0 +1,231 @@
+/* s390-dis.c -- Disassemble S390 instructions
+   Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
+
+   This file is part of GDB, GAS and the GNU binutils.
+
+   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 <stdio.h>
+#include "ansidecl.h"
+#include "sysdep.h"
+#include "dis-asm.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;
+{
+  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();
+  }
+  init_flag = 1;
+}
+
+/* Extracts an operand value from an instruction.  */
+
+static inline unsigned int
+s390_extract_operand (insn, operand)
+     unsigned char *insn;
+     const struct s390_operand *operand;
+{
+  unsigned int val;
+  int bits;
+
+  /* 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);
+  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;
+}
+
+/* Print a S390 instruction.  */
+
+int
+print_insn_s390 (memaddr, info)
+     bfd_vma memaddr;
+     struct disassemble_info *info;
+{
+  bfd_byte buffer[6];
+  const struct s390_opcode *opcode;
+  const struct s390_opcode *opcode_end;
+  unsigned int value;
+  int status, opsize, bufsize;
+  char separator;
+
+  if (init_flag == 0)
+    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;
+    }
+    /* 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 */
+      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;
+  }
+}