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Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/xmon/ppc-dis.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/arch/powerpc/xmon/ppc-dis.c b/arch/powerpc/xmon/ppc-dis.c new file mode 100644 index 0000000000..75fa98221d --- /dev/null +++ b/arch/powerpc/xmon/ppc-dis.c @@ -0,0 +1,285 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* ppc-dis.c -- Disassemble PowerPC instructions + 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 <asm/cputable.h> +#include <asm/cpu_has_feature.h> +#include "nonstdio.h" +#include "ansidecl.h" +#include "ppc.h" +#include "dis-asm.h" + +/* 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. */ + +static long +operand_value_powerpc (const struct powerpc_operand *operand, + unsigned long insn, ppc_cpu_t 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; + } + } + + return value; +} + +/* Determine whether the optional operand(s) should be printed. */ + +static int +skip_optional_operands (const unsigned char *opindex, + unsigned long insn, ppc_cpu_t dialect) +{ + const struct powerpc_operand *operand; + + 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; + + opcode_end = powerpc_opcodes + powerpc_num_opcodes; + /* Find the first match in the opcode table for this major opcode. */ + for (opcode = powerpc_opcodes; opcode < opcode_end; ++opcode) + { + const unsigned char *opindex; + const struct powerpc_operand *operand; + int invalid; + + if ((insn & opcode->mask) != opcode->opcode + || (dialect != (ppc_cpu_t) -1 + && ((opcode->flags & dialect) == 0 + || (opcode->deprecated & dialect) != 0))) + continue; + + /* Check validity of operands. */ + invalid = 0; + for (opindex = opcode->operands; *opindex != 0; opindex++) + { + operand = powerpc_operands + *opindex; + if (operand->extract) + (*operand->extract) (insn, dialect, &invalid); + } + if (invalid) + continue; + + 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("%-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; + + 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; + + /* If all of the optional operands have the value zero, + then don't print any of them. */ + if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0) + { + if (skip_optional < 0) + skip_optional = skip_optional_operands (opindex, insn, + dialect); + if (skip_optional) + continue; + } + + value = operand_value_powerpc (operand, insn, dialect); + + if (need_comma) + { + printf(","); + need_comma = 0; + } + + /* Print the operand as directed by the flags. */ + if ((operand->flags & PPC_OPERAND_GPR) != 0 + || ((operand->flags & PPC_OPERAND_GPR_0) != 0 && value != 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_VSR) != 0) + printf("vs%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_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 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))) + { + 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) + { + 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. + 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. */ + printf(".long 0x%lx", insn); + + return 4; +} |