/* ppc-dis.c -- Disassemble PowerPC instructions
- Copyright 1994, 1995, 2000, 2001, 2002, 2003, 2004, 2005, 2006
- Free Software Foundation, Inc.
+ Copyright (C) 1994-2016 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Cygnus Support
This file is part of GDB, GAS, and the GNU binutils.
#include "ppc.h"
#include "dis-asm.h"
-/* Print a PowerPC or POWER instruction. */
+/* This file provides several disassembler functions, all of which use
+ the disassembler interface defined in dis-asm.h. Several functions
+ are provided because this file handles disassembly for the PowerPC
+ in both big and little endian mode and also for the POWER (RS/6000)
+ chip. */
+
+/* Extract the operand value from the PowerPC or POWER instruction. */
-int
-print_insn_powerpc (unsigned long insn, unsigned long memaddr)
+static long
+operand_value_powerpc (const struct powerpc_operand *operand,
+ unsigned long insn, ppc_cpu_t dialect)
{
- const struct powerpc_opcode *opcode;
- const struct powerpc_opcode *opcode_end;
- unsigned long op;
- int dialect;
+ long value;
+ int invalid;
+ /* Extract the value from the instruction. */
+ if (operand->extract)
+ value = (*operand->extract) (insn, dialect, &invalid);
+ else
+ {
+ if (operand->shift >= 0)
+ value = (insn >> operand->shift) & operand->bitm;
+ else
+ value = (insn << -operand->shift) & operand->bitm;
+ if ((operand->flags & PPC_OPERAND_SIGNED) != 0)
+ {
+ /* BITM is always some number of zeros followed by some
+ number of ones, followed by some number of zeros. */
+ unsigned long top = operand->bitm;
+ /* top & -top gives the rightmost 1 bit, so this
+ fills in any trailing zeros. */
+ top |= (top & -top) - 1;
+ top &= ~(top >> 1);
+ value = (value ^ top) - top;
+ }
+ }
- dialect = PPC_OPCODE_PPC | PPC_OPCODE_CLASSIC | PPC_OPCODE_COMMON
- | PPC_OPCODE_64 | PPC_OPCODE_POWER4 | PPC_OPCODE_ALTIVEC;
+ return value;
+}
- if (cpu_has_feature(CPU_FTRS_POWER5))
- dialect |= PPC_OPCODE_POWER5;
+/* Determine whether the optional operand(s) should be printed. */
- if (cpu_has_feature(CPU_FTRS_CELL))
- dialect |= PPC_OPCODE_CELL | PPC_OPCODE_ALTIVEC;
+static int
+skip_optional_operands (const unsigned char *opindex,
+ unsigned long insn, ppc_cpu_t dialect)
+{
+ const struct powerpc_operand *operand;
- if (cpu_has_feature(CPU_FTRS_POWER6))
- dialect |= PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6 | PPC_OPCODE_ALTIVEC;
+ for (; *opindex != 0; opindex++)
+ {
+ operand = &powerpc_operands[*opindex];
+ if ((operand->flags & PPC_OPERAND_NEXT) != 0
+ || ((operand->flags & PPC_OPERAND_OPTIONAL) != 0
+ && operand_value_powerpc (operand, insn, dialect) !=
+ ppc_optional_operand_value (operand)))
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Find a match for INSN in the opcode table, given machine DIALECT.
+ A DIALECT of -1 is special, matching all machine opcode variations. */
+
+static const struct powerpc_opcode *
+lookup_powerpc (unsigned long insn, ppc_cpu_t 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;
- again:
- for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++)
+ /* Find the first match in the opcode table for this major opcode. */
+ 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)
+ || (dialect != (ppc_cpu_t) -1
+ && ((opcode->flags & dialect) == 0
+ || (opcode->deprecated & 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. */
+ /* Check validity of operands. */
invalid = 0;
for (opindex = opcode->operands; *opindex != 0; opindex++)
{
if (invalid)
continue;
- /* The instruction is valid. */
- printf("%s", opcode->name);
+ return opcode;
+ }
+
+ return NULL;
+}
+
+/* Print a PowerPC or POWER instruction. */
+
+int print_insn_powerpc (unsigned long insn, unsigned long memaddr)
+{
+ const struct powerpc_opcode *opcode;
+ bool insn_is_short;
+ ppc_cpu_t dialect;
+
+ dialect = PPC_OPCODE_PPC | PPC_OPCODE_COMMON
+ | PPC_OPCODE_64 | PPC_OPCODE_POWER4 | PPC_OPCODE_ALTIVEC;
+
+ if (cpu_has_feature(CPU_FTRS_POWER5))
+ dialect |= PPC_OPCODE_POWER5;
+
+ if (cpu_has_feature(CPU_FTRS_CELL))
+ dialect |= (PPC_OPCODE_CELL | PPC_OPCODE_ALTIVEC);
+
+ if (cpu_has_feature(CPU_FTRS_POWER6))
+ dialect |= (PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6 | PPC_OPCODE_ALTIVEC);
+
+ if (cpu_has_feature(CPU_FTRS_POWER7))
+ dialect |= (PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6 | PPC_OPCODE_POWER7
+ | PPC_OPCODE_ALTIVEC | PPC_OPCODE_VSX);
+
+ if (cpu_has_feature(CPU_FTRS_POWER8))
+ dialect |= (PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6 | PPC_OPCODE_POWER7
+ | PPC_OPCODE_POWER8 | PPC_OPCODE_HTM
+ | PPC_OPCODE_ALTIVEC | PPC_OPCODE_ALTIVEC2 | PPC_OPCODE_VSX);
+
+ if (cpu_has_feature(CPU_FTRS_POWER9))
+ dialect |= (PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6 | PPC_OPCODE_POWER7
+ | PPC_OPCODE_POWER8 | PPC_OPCODE_POWER9 | PPC_OPCODE_HTM
+ | PPC_OPCODE_ALTIVEC | PPC_OPCODE_ALTIVEC2
+ | PPC_OPCODE_VSX | PPC_OPCODE_VSX3),
+
+ /* Get the major opcode of the insn. */
+ opcode = NULL;
+ insn_is_short = false;
+
+ if (opcode == NULL)
+ opcode = lookup_powerpc (insn, dialect);
+ if (opcode == NULL && (dialect & PPC_OPCODE_ANY) != 0)
+ opcode = lookup_powerpc (insn, (ppc_cpu_t) -1);
+
+ if (opcode != NULL)
+ {
+ const unsigned char *opindex;
+ const struct powerpc_operand *operand;
+ int need_comma;
+ int need_paren;
+ int skip_optional;
+
if (opcode->operands[0] != 0)
- printf("\t");
+ printf("%-7s ", opcode->name);
+ else
+ printf("%s", opcode->name);
+
+ if (insn_is_short)
+ /* The operands will be fetched out of the 16-bit instruction. */
+ insn >>= 16;
/* Now extract and print the operands. */
need_comma = 0;
need_paren = 0;
+ skip_optional = -1;
for (opindex = opcode->operands; *opindex != 0; opindex++)
{
long value;
if ((operand->flags & PPC_OPERAND_FAKE) != 0)
continue;
- /* Extract the value from the instruction. */
- if (operand->extract)
- value = (*operand->extract) (insn, dialect, &invalid);
- else
+ /* If all of the optional operands have the value zero,
+ then don't print any of them. */
+ if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0)
{
- 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 (skip_optional < 0)
+ skip_optional = skip_optional_operands (opindex, insn,
+ dialect);
+ if (skip_optional)
+ continue;
}
- /* 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;
+ value = operand_value_powerpc (operand, insn, dialect);
if (need_comma)
{
printf("f%ld", value);
else if ((operand->flags & PPC_OPERAND_VR) != 0)
printf("v%ld", value);
+ else if ((operand->flags & PPC_OPERAND_VSR) != 0)
+ printf("vs%ld", value);
else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)
- print_address (memaddr + value);
+ 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)
+ print_address(value & 0xffffffff);
+ else if ((operand->flags & PPC_OPERAND_FSL) != 0)
+ printf("fsl%ld", value);
+ else if ((operand->flags & PPC_OPERAND_FCR) != 0)
+ printf("fcr%ld", value);
+ else if ((operand->flags & PPC_OPERAND_UDI) != 0)
printf("%ld", value);
- else
+ else if ((operand->flags & PPC_OPERAND_CR_REG) != 0
+ && (((dialect & PPC_OPCODE_PPC) != 0)
+ || ((dialect & PPC_OPCODE_VLE) != 0)))
+ printf("cr%ld", value);
+ else if (((operand->flags & PPC_OPERAND_CR_BIT) != 0)
+ && (((dialect & PPC_OPCODE_PPC) != 0)
+ || ((dialect & PPC_OPCODE_VLE) != 0)))
{
- if (operand->bits == 3)
- printf("cr%ld", 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]);
- }
+ 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]);
}
+ else
+ printf("%d", (int) value);
if (need_paren)
{
}
}
- /* We have found and printed an instruction; return. */
- return 4;
- }
-
- if ((dialect & PPC_OPCODE_ANY) != 0)
- {
- dialect = ~PPC_OPCODE_ANY;
- goto again;
+ /* We have found and printed an instruction.
+ If it was a short VLE instruction we have more to do. */
+ if (insn_is_short)
+ {
+ memaddr += 2;
+ return 2;
+ }
+ else
+ /* Otherwise, return. */
+ return 4;
}
/* We could not find a match. */
projects / karo-tx-linux.git / blobdiff