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509 lines
13 KiB
C
509 lines
13 KiB
C
/* RISC-V disassembler
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Copyright (C) 2011-2017 Free Software Foundation, Inc.
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Contributed by Andrew Waterman (andrew@sifive.com).
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Based on MIPS target.
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This file is part of the GNU opcodes library.
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This library is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING3. If not,
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see <http://www.gnu.org/licenses/>. */
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#include "sysdep.h"
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#include "disassemble.h"
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#include "libiberty.h"
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#include "opcode/riscv.h"
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#include "opintl.h"
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#include "elf-bfd.h"
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#include "elf/riscv.h"
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#include <stdint.h>
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#include <ctype.h>
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struct riscv_private_data
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{
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bfd_vma gp;
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bfd_vma print_addr;
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bfd_vma hi_addr[OP_MASK_RD + 1];
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};
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static const char * const *riscv_gpr_names;
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static const char * const *riscv_fpr_names;
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/* Other options. */
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static int no_aliases; /* If set disassemble as most general inst. */
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static void
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set_default_riscv_dis_options (void)
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{
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riscv_gpr_names = riscv_gpr_names_abi;
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riscv_fpr_names = riscv_fpr_names_abi;
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no_aliases = 0;
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}
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static void
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parse_riscv_dis_option (const char *option)
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{
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if (strcmp (option, "no-aliases") == 0)
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no_aliases = 1;
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else if (strcmp (option, "numeric") == 0)
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{
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riscv_gpr_names = riscv_gpr_names_numeric;
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riscv_fpr_names = riscv_fpr_names_numeric;
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}
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else
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{
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/* Invalid option. */
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fprintf (stderr, _("Unrecognized disassembler option: %s\n"), option);
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}
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}
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static void
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parse_riscv_dis_options (const char *opts_in)
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{
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char *opts = xstrdup (opts_in), *opt = opts, *opt_end = opts;
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set_default_riscv_dis_options ();
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for ( ; opt_end != NULL; opt = opt_end + 1)
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{
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if ((opt_end = strchr (opt, ',')) != NULL)
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*opt_end = 0;
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parse_riscv_dis_option (opt);
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}
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free (opts);
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}
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/* Print one argument from an array. */
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static void
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arg_print (struct disassemble_info *info, unsigned long val,
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const char* const* array, size_t size)
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{
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const char *s = val >= size || array[val] == NULL ? "unknown" : array[val];
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(*info->fprintf_func) (info->stream, "%s", s);
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}
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static void
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maybe_print_address (struct riscv_private_data *pd, int base_reg, int offset)
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{
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if (pd->hi_addr[base_reg] != (bfd_vma)-1)
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{
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pd->print_addr = pd->hi_addr[base_reg] + offset;
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pd->hi_addr[base_reg] = -1;
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}
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else if (base_reg == X_GP && pd->gp != (bfd_vma)-1)
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pd->print_addr = pd->gp + offset;
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else if (base_reg == X_TP || base_reg == 0)
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pd->print_addr = offset;
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}
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/* Print insn arguments for 32/64-bit code. */
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static void
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print_insn_args (const char *d, insn_t l, bfd_vma pc, disassemble_info *info)
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{
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struct riscv_private_data *pd = info->private_data;
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int rs1 = (l >> OP_SH_RS1) & OP_MASK_RS1;
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int rd = (l >> OP_SH_RD) & OP_MASK_RD;
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fprintf_ftype print = info->fprintf_func;
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if (*d != '\0')
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print (info->stream, "\t");
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for (; *d != '\0'; d++)
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{
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switch (*d)
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{
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case 'C': /* RVC */
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switch (*++d)
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{
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case 's': /* RS1 x8-x15 */
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case 'w': /* RS1 x8-x15 */
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print (info->stream, "%s",
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riscv_gpr_names[EXTRACT_OPERAND (CRS1S, l) + 8]);
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break;
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case 't': /* RS2 x8-x15 */
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case 'x': /* RS2 x8-x15 */
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print (info->stream, "%s",
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riscv_gpr_names[EXTRACT_OPERAND (CRS2S, l) + 8]);
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break;
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case 'U': /* RS1, constrained to equal RD */
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print (info->stream, "%s", riscv_gpr_names[rd]);
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break;
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case 'c': /* RS1, constrained to equal sp */
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print (info->stream, "%s", riscv_gpr_names[X_SP]);
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break;
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case 'V': /* RS2 */
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print (info->stream, "%s",
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riscv_gpr_names[EXTRACT_OPERAND (CRS2, l)]);
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break;
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case 'i':
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print (info->stream, "%d", (int)EXTRACT_RVC_SIMM3 (l));
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break;
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case 'o':
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case 'j':
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print (info->stream, "%d", (int)EXTRACT_RVC_IMM (l));
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break;
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case 'k':
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print (info->stream, "%d", (int)EXTRACT_RVC_LW_IMM (l));
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break;
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case 'l':
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print (info->stream, "%d", (int)EXTRACT_RVC_LD_IMM (l));
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break;
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case 'm':
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print (info->stream, "%d", (int)EXTRACT_RVC_LWSP_IMM (l));
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break;
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case 'n':
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print (info->stream, "%d", (int)EXTRACT_RVC_LDSP_IMM (l));
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break;
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case 'K':
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print (info->stream, "%d", (int)EXTRACT_RVC_ADDI4SPN_IMM (l));
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break;
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case 'L':
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print (info->stream, "%d", (int)EXTRACT_RVC_ADDI16SP_IMM (l));
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break;
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case 'M':
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print (info->stream, "%d", (int)EXTRACT_RVC_SWSP_IMM (l));
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break;
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case 'N':
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print (info->stream, "%d", (int)EXTRACT_RVC_SDSP_IMM (l));
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break;
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case 'p':
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info->target = EXTRACT_RVC_B_IMM (l) + pc;
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(*info->print_address_func) (info->target, info);
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break;
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case 'a':
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info->target = EXTRACT_RVC_J_IMM (l) + pc;
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(*info->print_address_func) (info->target, info);
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break;
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case 'u':
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print (info->stream, "0x%x",
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(int)(EXTRACT_RVC_IMM (l) & (RISCV_BIGIMM_REACH-1)));
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break;
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case '>':
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print (info->stream, "0x%x", (int)EXTRACT_RVC_IMM (l) & 0x3f);
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break;
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case '<':
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print (info->stream, "0x%x", (int)EXTRACT_RVC_IMM (l) & 0x1f);
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break;
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case 'T': /* floating-point RS2 */
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print (info->stream, "%s",
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riscv_fpr_names[EXTRACT_OPERAND (CRS2, l)]);
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break;
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case 'D': /* floating-point RS2 x8-x15 */
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print (info->stream, "%s",
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riscv_fpr_names[EXTRACT_OPERAND (CRS2S, l) + 8]);
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break;
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}
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break;
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case ',':
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case '(':
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case ')':
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case '[':
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case ']':
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print (info->stream, "%c", *d);
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break;
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case '0':
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/* Only print constant 0 if it is the last argument */
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if (!d[1])
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print (info->stream, "0");
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break;
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case 'b':
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case 's':
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print (info->stream, "%s", riscv_gpr_names[rs1]);
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break;
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case 't':
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print (info->stream, "%s",
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riscv_gpr_names[EXTRACT_OPERAND (RS2, l)]);
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break;
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case 'u':
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print (info->stream, "0x%x",
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(unsigned)EXTRACT_UTYPE_IMM (l) >> RISCV_IMM_BITS);
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break;
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case 'm':
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arg_print (info, EXTRACT_OPERAND (RM, l),
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riscv_rm, ARRAY_SIZE (riscv_rm));
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break;
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case 'P':
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arg_print (info, EXTRACT_OPERAND (PRED, l),
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riscv_pred_succ, ARRAY_SIZE (riscv_pred_succ));
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break;
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case 'Q':
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arg_print (info, EXTRACT_OPERAND (SUCC, l),
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riscv_pred_succ, ARRAY_SIZE (riscv_pred_succ));
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break;
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case 'o':
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maybe_print_address (pd, rs1, EXTRACT_ITYPE_IMM (l));
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/* Fall through. */
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case 'j':
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if (((l & MASK_ADDI) == MATCH_ADDI && rs1 != 0)
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|| (l & MASK_JALR) == MATCH_JALR)
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maybe_print_address (pd, rs1, EXTRACT_ITYPE_IMM (l));
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print (info->stream, "%d", (int)EXTRACT_ITYPE_IMM (l));
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break;
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case 'q':
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maybe_print_address (pd, rs1, EXTRACT_STYPE_IMM (l));
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print (info->stream, "%d", (int)EXTRACT_STYPE_IMM (l));
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break;
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case 'a':
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info->target = EXTRACT_UJTYPE_IMM (l) + pc;
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(*info->print_address_func) (info->target, info);
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break;
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case 'p':
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info->target = EXTRACT_SBTYPE_IMM (l) + pc;
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(*info->print_address_func) (info->target, info);
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break;
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case 'd':
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if ((l & MASK_AUIPC) == MATCH_AUIPC)
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pd->hi_addr[rd] = pc + EXTRACT_UTYPE_IMM (l);
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else if ((l & MASK_LUI) == MATCH_LUI)
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pd->hi_addr[rd] = EXTRACT_UTYPE_IMM (l);
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else if ((l & MASK_C_LUI) == MATCH_C_LUI)
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pd->hi_addr[rd] = EXTRACT_RVC_LUI_IMM (l);
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print (info->stream, "%s", riscv_gpr_names[rd]);
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break;
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case 'z':
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print (info->stream, "%s", riscv_gpr_names[0]);
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break;
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case '>':
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print (info->stream, "0x%x", (int)EXTRACT_OPERAND (SHAMT, l));
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break;
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case '<':
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print (info->stream, "0x%x", (int)EXTRACT_OPERAND (SHAMTW, l));
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break;
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case 'S':
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case 'U':
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print (info->stream, "%s", riscv_fpr_names[rs1]);
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break;
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case 'T':
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print (info->stream, "%s", riscv_fpr_names[EXTRACT_OPERAND (RS2, l)]);
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break;
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case 'D':
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print (info->stream, "%s", riscv_fpr_names[rd]);
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break;
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case 'R':
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print (info->stream, "%s", riscv_fpr_names[EXTRACT_OPERAND (RS3, l)]);
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break;
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case 'E':
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{
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const char* csr_name = NULL;
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unsigned int csr = EXTRACT_OPERAND (CSR, l);
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switch (csr)
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{
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#define DECLARE_CSR(name, num) case num: csr_name = #name; break;
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#include "opcode/riscv-opc.h"
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#undef DECLARE_CSR
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}
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if (csr_name)
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print (info->stream, "%s", csr_name);
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else
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print (info->stream, "0x%x", csr);
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break;
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}
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case 'Z':
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print (info->stream, "%d", rs1);
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break;
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default:
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/* xgettext:c-format */
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print (info->stream, _("# internal error, undefined modifier (%c)"),
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*d);
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return;
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}
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}
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}
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/* Print the RISC-V instruction at address MEMADDR in debugged memory,
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on using INFO. Returns length of the instruction, in bytes.
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BIGENDIAN must be 1 if this is big-endian code, 0 if
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this is little-endian code. */
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static int
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riscv_disassemble_insn (bfd_vma memaddr, insn_t word, disassemble_info *info)
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{
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const struct riscv_opcode *op;
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static bfd_boolean init = 0;
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static const struct riscv_opcode *riscv_hash[OP_MASK_OP + 1];
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struct riscv_private_data *pd;
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int insnlen;
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#define OP_HASH_IDX(i) ((i) & (riscv_insn_length (i) == 2 ? 0x3 : OP_MASK_OP))
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/* Build a hash table to shorten the search time. */
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if (! init)
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{
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for (op = riscv_opcodes; op->name; op++)
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if (!riscv_hash[OP_HASH_IDX (op->match)])
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riscv_hash[OP_HASH_IDX (op->match)] = op;
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init = 1;
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}
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if (info->private_data == NULL)
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{
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int i;
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pd = info->private_data = xcalloc (1, sizeof (struct riscv_private_data));
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pd->gp = -1;
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pd->print_addr = -1;
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for (i = 0; i < (int)ARRAY_SIZE (pd->hi_addr); i++)
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pd->hi_addr[i] = -1;
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for (i = 0; i < info->symtab_size; i++)
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if (strcmp (bfd_asymbol_name (info->symtab[i]), RISCV_GP_SYMBOL) == 0)
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pd->gp = bfd_asymbol_value (info->symtab[i]);
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}
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else
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pd = info->private_data;
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insnlen = riscv_insn_length (word);
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info->bytes_per_chunk = insnlen % 4 == 0 ? 4 : 2;
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info->bytes_per_line = 8;
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info->display_endian = info->endian;
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info->insn_info_valid = 1;
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info->branch_delay_insns = 0;
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info->data_size = 0;
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info->insn_type = dis_nonbranch;
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info->target = 0;
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info->target2 = 0;
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op = riscv_hash[OP_HASH_IDX (word)];
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if (op != NULL)
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{
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int xlen = 0;
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/* If XLEN is not known, get its value from the ELF class. */
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if (info->mach == bfd_mach_riscv64)
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xlen = 64;
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else if (info->mach == bfd_mach_riscv32)
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xlen = 32;
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else if (info->section != NULL)
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{
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Elf_Internal_Ehdr *ehdr = elf_elfheader (info->section->owner);
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xlen = ehdr->e_ident[EI_CLASS] == ELFCLASS64 ? 64 : 32;
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}
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for (; op->name; op++)
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{
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/* Does the opcode match? */
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if (! (op->match_func) (op, word))
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continue;
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/* Is this a pseudo-instruction and may we print it as such? */
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if (no_aliases && (op->pinfo & INSN_ALIAS))
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continue;
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/* Is this instruction restricted to a certain value of XLEN? */
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if (isdigit (op->subset[0]) && atoi (op->subset) != xlen)
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continue;
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/* It's a match. */
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(*info->fprintf_func) (info->stream, "%s", op->name);
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print_insn_args (op->args, word, memaddr, info);
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/* Try to disassemble multi-instruction addressing sequences. */
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if (pd->print_addr != (bfd_vma)-1)
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{
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info->target = pd->print_addr;
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(*info->fprintf_func) (info->stream, " # ");
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(*info->print_address_func) (info->target, info);
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pd->print_addr = -1;
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}
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return insnlen;
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}
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}
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/* We did not find a match, so just print the instruction bits. */
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info->insn_type = dis_noninsn;
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(*info->fprintf_func) (info->stream, "0x%llx", (unsigned long long)word);
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return insnlen;
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}
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int
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print_insn_riscv (bfd_vma memaddr, struct disassemble_info *info)
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{
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bfd_byte packet[2];
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insn_t insn = 0;
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bfd_vma n;
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int status;
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if (info->disassembler_options != NULL)
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{
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parse_riscv_dis_options (info->disassembler_options);
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/* Avoid repeatedly parsing the options. */
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info->disassembler_options = NULL;
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}
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else if (riscv_gpr_names == NULL)
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set_default_riscv_dis_options ();
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/* Instructions are a sequence of 2-byte packets in little-endian order. */
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for (n = 0; n < sizeof (insn) && n < riscv_insn_length (insn); n += 2)
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{
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status = (*info->read_memory_func) (memaddr + n, packet, 2, info);
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if (status != 0)
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{
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/* Don't fail just because we fell off the end. */
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if (n > 0)
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break;
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(*info->memory_error_func) (status, memaddr, info);
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return status;
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}
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insn |= ((insn_t) bfd_getl16 (packet)) << (8 * n);
|
|
}
|
|
|
|
return riscv_disassemble_insn (memaddr, insn, info);
|
|
}
|
|
|
|
void
|
|
print_riscv_disassembler_options (FILE *stream)
|
|
{
|
|
fprintf (stream, _("\n\
|
|
The following RISC-V-specific disassembler options are supported for use\n\
|
|
with the -M switch (multiple options should be separated by commas):\n"));
|
|
|
|
fprintf (stream, _("\n\
|
|
numeric Print numeric reigster names, rather than ABI names.\n"));
|
|
|
|
fprintf (stream, _("\n\
|
|
no-aliases Disassemble only into canonical instructions, rather\n\
|
|
than into pseudoinstructions.\n"));
|
|
|
|
fprintf (stream, _("\n"));
|
|
}
|