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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ppc/xmon/ppc-dis.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/ppc/xmon/ppc-dis.c')
-rw-r--r--arch/ppc/xmon/ppc-dis.c190
1 files changed, 190 insertions, 0 deletions
diff --git a/arch/ppc/xmon/ppc-dis.c b/arch/ppc/xmon/ppc-dis.c
new file mode 100644
index 00000000000..798ac1a677f
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+++ b/arch/ppc/xmon/ppc-dis.c
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+/* 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"
+
+static int print_insn_powerpc PARAMS ((FILE *, unsigned long insn,
+ unsigned memaddr, int dialect));
+
+extern void print_address PARAMS((unsigned memaddr));
+
+/* Print a big endian PowerPC instruction. For convenience, also
+ disassemble instructions supported by the Motorola PowerPC 601. */
+
+int
+print_insn_big_powerpc (FILE *out, unsigned long insn, unsigned memaddr)
+{
+ return print_insn_powerpc (out, insn, memaddr,
+ PPC_OPCODE_PPC | PPC_OPCODE_601);
+}
+
+/* Print a PowerPC or POWER instruction. */
+
+static int
+print_insn_powerpc (FILE *out, unsigned long insn, unsigned memaddr,
+ int dialect)
+{
+ const struct powerpc_opcode *opcode;
+ const struct powerpc_opcode *opcode_end;
+ unsigned long op;
+
+ /* 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;
+ 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, &invalid);
+ }
+ if (invalid)
+ continue;
+
+ /* The instruction is valid. */
+ fprintf(out, "%s", opcode->name);
+ if (opcode->operands[0] != 0)
+ fprintf(out, "\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, (int *) 0);
+ 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)
+ {
+ fprintf(out, ",");
+ need_comma = 0;
+ }
+
+ /* Print the operand as directed by the flags. */
+ if ((operand->flags & PPC_OPERAND_GPR) != 0)
+ fprintf(out, "r%ld", value);
+ else if ((operand->flags & PPC_OPERAND_FPR) != 0)
+ fprintf(out, "f%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)
+ fprintf(out, "%ld", value);
+ else
+ {
+ if (operand->bits == 3)
+ fprintf(out, "cr%d", value);
+ else
+ {
+ static const char *cbnames[4] = { "lt", "gt", "eq", "so" };
+ int cr;
+ int cc;
+
+ cr = value >> 2;
+ if (cr != 0)
+ fprintf(out, "4*cr%d", cr);
+ cc = value & 3;
+ if (cc != 0)
+ {
+ if (cr != 0)
+ fprintf(out, "+");
+ fprintf(out, "%s", cbnames[cc]);
+ }
+ }
+ }
+
+ if (need_paren)
+ {
+ fprintf(out, ")");
+ need_paren = 0;
+ }
+
+ if ((operand->flags & PPC_OPERAND_PARENS) == 0)
+ need_comma = 1;
+ else
+ {
+ fprintf(out, "(");
+ need_paren = 1;
+ }
+ }
+
+ /* We have found and printed an instruction; return. */
+ return 4;
+ }
+
+ /* We could not find a match. */
+ fprintf(out, ".long 0x%lx", insn);
+
+ return 4;
+}