--- /dev/null
+/* ppc-dis.c -- Disassemble PowerPC instructions
+ Copyright 1994 Free Software Foundation, Inc.
+ Written by Ian Lance Taylor, Cygnus Support
+
+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 "nonstdio.h"
+#include "ansidecl.h"
+#include "ppc.h"
+
+extern void print_address (unsigned long memaddr);
+
+/* Print a PowerPC or POWER instruction. */
+
+int
+print_insn_powerpc (unsigned long insn, unsigned long memaddr, int dialect)
+{
+ const struct powerpc_opcode *opcode;
+ const struct powerpc_opcode *opcode_end;
+ unsigned long op;
+
+ if (dialect == 0)
+ dialect = PPC_OPCODE_PPC | PPC_OPCODE_CLASSIC | PPC_OPCODE_COMMON
+ | PPC_OPCODE_64 | PPC_OPCODE_POWER4 | PPC_OPCODE_ALTIVEC;
+
+ /* Get the major opcode of the instruction. */
+ op = PPC_OP (insn);
+
+ /* 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 = powerpc_opcodes + powerpc_num_opcodes;
+ again:
+ for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++)
+ {
+ unsigned long table_op;
+ const unsigned char *opindex;
+ const struct powerpc_operand *operand;
+ int invalid;
+ int need_comma;
+ int need_paren;
+
+ table_op = PPC_OP (opcode->opcode);
+ if (op < table_op)
+ break;
+ if (op > table_op)
+ continue;
+
+ if ((insn & opcode->mask) != opcode->opcode
+ || (opcode->flags & dialect) == 0)
+ continue;
+
+ /* 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 = powerpc_operands + *opindex;
+ if (operand->extract)
+ (*operand->extract) (insn, dialect, &invalid);
+ }
+ if (invalid)
+ continue;
+
+ /* The instruction is valid. */
+ printf("%s", opcode->name);
+ if (opcode->operands[0] != 0)
+ printf("\t");
+
+ /* Now extract and print the operands. */
+ need_comma = 0;
+ need_paren = 0;
+ for (opindex = opcode->operands; *opindex != 0; opindex++)
+ {
+ long value;
+
+ operand = powerpc_operands + *opindex;
+
+ /* Operands that are marked FAKE are simply ignored. We
+ already made sure that the extract function considered
+ the instruction to be valid. */
+ if ((operand->flags & PPC_OPERAND_FAKE) != 0)
+ continue;
+
+ /* Extract the value from the instruction. */
+ if (operand->extract)
+ value = (*operand->extract) (insn, dialect, &invalid);
+ else
+ {
+ value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
+ if ((operand->flags & PPC_OPERAND_SIGNED) != 0
+ && (value & (1 << (operand->bits - 1))) != 0)
+ value -= 1 << operand->bits;
+ }
+
+ /* If the operand is optional, and the value is zero, don't
+ print anything. */
+ if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0
+ && (operand->flags & PPC_OPERAND_NEXT) == 0
+ && value == 0)
+ continue;
+
+ if (need_comma)
+ {
+ printf(",");
+ need_comma = 0;
+ }
+
+ /* Print the operand as directed by the flags. */
+ if ((operand->flags & PPC_OPERAND_GPR) != 0)
+ printf("r%ld", value);
+ else if ((operand->flags & PPC_OPERAND_FPR) != 0)
+ printf("f%ld", value);
+ else if ((operand->flags & PPC_OPERAND_VR) != 0)
+ printf("v%ld", value);
+ else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)
+ print_address (memaddr + value);
+ else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)
+ print_address (value & 0xffffffff);
+ else if ((operand->flags & PPC_OPERAND_CR) == 0
+ || (dialect & PPC_OPCODE_PPC) == 0)
+ printf("%ld", value);
+ else
+ {
+ if (operand->bits == 3)
+ printf("cr%d", value);
+ else
+ {
+ static const char *cbnames[4] = { "lt", "gt", "eq", "so" };
+ int cr;
+ int cc;
+
+ cr = value >> 2;
+ if (cr != 0)
+ printf("4*cr%d+", cr);
+ cc = value & 3;
+ printf("%s", cbnames[cc]);
+ }
+ }
+
+ if (need_paren)
+ {
+ printf(")");
+ need_paren = 0;
+ }
+
+ if ((operand->flags & PPC_OPERAND_PARENS) == 0)
+ need_comma = 1;
+ else
+ {
+ printf("(");
+ need_paren = 1;
+ }
+ }
+
+ /* We have found and printed an instruction; return. */
+ return 4;
+ }
+
+ if ((dialect & PPC_OPCODE_ANY) != 0)
+ {
+ dialect = ~PPC_OPCODE_ANY;
+ goto again;
+ }
+
+ /* We could not find a match. */
+ printf(".long 0x%lx", insn);
+
+ return 4;
+}
git://git.onelab.eu / linux-2.6.git / blobdiff