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Projet_SETI_RISC-V/riscv-gnu-toolchain/binutils/opcodes/riscv-dis.c

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projet
2023-03-06 14:48:14 +01:00
/* RISC-V disassembler
Copyright (C) 2011-2022 Free Software Foundation, Inc.
Contributed by Andrew Waterman (andrew@sifive.com).
Based on MIPS target.
This file is part of the GNU opcodes library.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
It is distributed in the hope that it 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 program; see the file COPYING3. If not,
see <http://www.gnu.org/licenses/>. */
#include "sysdep.h"
#include "disassemble.h"
#include "libiberty.h"
#include "opcode/riscv.h"
#include "opintl.h"
#include "elf-bfd.h"
#include "elf/riscv.h"
#include "elfxx-riscv.h"
#include <stdint.h>
#include <ctype.h>
static enum riscv_spec_class default_isa_spec = ISA_SPEC_CLASS_DRAFT - 1;
static enum riscv_spec_class default_priv_spec = PRIV_SPEC_CLASS_NONE;
unsigned xlen = 0;
static riscv_subset_list_t riscv_subsets;
static riscv_parse_subset_t riscv_rps_dis =
{
&riscv_subsets, /* subset_list. */
opcodes_error_handler,/* error_handler. */
&xlen, /* xlen. */
&default_isa_spec, /* isa_spec. */
false, /* check_unknown_prefixed_ext. */
};
struct riscv_private_data
{
bfd_vma gp;
bfd_vma print_addr;
bfd_vma hi_addr[OP_MASK_RD + 1];
};
/* Used for mapping symbols. */
static int last_map_symbol = -1;
static bfd_vma last_stop_offset = 0;
enum riscv_seg_mstate last_map_state;
static const char * const *riscv_gpr_names;
static const char * const *riscv_fpr_names;
/* If set, disassemble as most general instruction. */
static int no_aliases;
static void
set_default_riscv_dis_options (void)
{
riscv_gpr_names = riscv_gpr_names_abi;
riscv_fpr_names = riscv_fpr_names_abi;
no_aliases = 0;
}
static bool
parse_riscv_dis_option_without_args (const char *option)
{
if (strcmp (option, "no-aliases") == 0)
no_aliases = 1;
else if (strcmp (option, "numeric") == 0)
{
riscv_gpr_names = riscv_gpr_names_numeric;
riscv_fpr_names = riscv_fpr_names_numeric;
}
else
return false;
return true;
}
static void
parse_riscv_dis_option (const char *option)
{
char *equal, *value;
if (parse_riscv_dis_option_without_args (option))
return;
equal = strchr (option, '=');
if (equal == NULL)
{
/* The option without '=' should be defined above. */
opcodes_error_handler (_("unrecognized disassembler option: %s"), option);
return;
}
if (equal == option
|| *(equal + 1) == '\0')
{
/* Invalid options with '=', no option name before '=',
and no value after '='. */
opcodes_error_handler (_("unrecognized disassembler option with '=': %s"),
option);
return;
}
*equal = '\0';
value = equal + 1;
if (strcmp (option, "priv-spec") == 0)
{
enum riscv_spec_class priv_spec = PRIV_SPEC_CLASS_NONE;
const char *name = NULL;
RISCV_GET_PRIV_SPEC_CLASS (value, priv_spec);
if (priv_spec == PRIV_SPEC_CLASS_NONE)
opcodes_error_handler (_("unknown privileged spec set by %s=%s"),
option, value);
else if (default_priv_spec == PRIV_SPEC_CLASS_NONE)
default_priv_spec = priv_spec;
else if (default_priv_spec != priv_spec)
{
RISCV_GET_PRIV_SPEC_NAME (name, default_priv_spec);
opcodes_error_handler (_("mis-matched privilege spec set by %s=%s, "
"the elf privilege attribute is %s"),
option, value, name);
}
}
else
{
/* xgettext:c-format */
opcodes_error_handler (_("unrecognized disassembler option: %s"), option);
}
}
static void
parse_riscv_dis_options (const char *opts_in)
{
char *opts = xstrdup (opts_in), *opt = opts, *opt_end = opts;
set_default_riscv_dis_options ();
for ( ; opt_end != NULL; opt = opt_end + 1)
{
if ((opt_end = strchr (opt, ',')) != NULL)
*opt_end = 0;
parse_riscv_dis_option (opt);
}
free (opts);
}
/* Print one argument from an array. */
static void
arg_print (struct disassemble_info *info, unsigned long val,
const char* const* array, size_t size)
{
const char *s = val >= size || array[val] == NULL ? "unknown" : array[val];
(*info->fprintf_styled_func) (info->stream, dis_style_text, "%s", s);
}
static void
maybe_print_address (struct riscv_private_data *pd, int base_reg, int offset,
int wide)
{
if (pd->hi_addr[base_reg] != (bfd_vma)-1)
{
pd->print_addr = (base_reg != 0 ? pd->hi_addr[base_reg] : 0) + offset;
pd->hi_addr[base_reg] = -1;
}
else if (base_reg == X_GP && pd->gp != (bfd_vma)-1)
pd->print_addr = pd->gp + offset;
else if (base_reg == X_TP || base_reg == 0)
pd->print_addr = offset;
/* Sign-extend a 32-bit value to a 64-bit value. */
if (wide)
pd->print_addr = (bfd_vma)(int32_t) pd->print_addr;
}
/* Print insn arguments for 32/64-bit code. */
static void
print_insn_args (const char *oparg, insn_t l, bfd_vma pc, disassemble_info *info)
{
struct riscv_private_data *pd = info->private_data;
int rs1 = (l >> OP_SH_RS1) & OP_MASK_RS1;
int rd = (l >> OP_SH_RD) & OP_MASK_RD;
fprintf_styled_ftype print = info->fprintf_styled_func;
const char *opargStart;
if (*oparg != '\0')
print (info->stream, dis_style_text, "\t");
for (; *oparg != '\0'; oparg++)
{
opargStart = oparg;
switch (*oparg)
{
case 'C': /* RVC */
switch (*++oparg)
{
case 's': /* RS1 x8-x15. */
case 'w': /* RS1 x8-x15. */
print (info->stream, dis_style_register, "%s",
riscv_gpr_names[EXTRACT_OPERAND (CRS1S, l) + 8]);
break;
case 't': /* RS2 x8-x15. */
case 'x': /* RS2 x8-x15. */
print (info->stream, dis_style_register, "%s",
riscv_gpr_names[EXTRACT_OPERAND (CRS2S, l) + 8]);
break;
case 'U': /* RS1, constrained to equal RD. */
print (info->stream, dis_style_register,
"%s", riscv_gpr_names[rd]);
break;
case 'c': /* RS1, constrained to equal sp. */
print (info->stream, dis_style_register, "%s",
riscv_gpr_names[X_SP]);
break;
case 'V': /* RS2 */
print (info->stream, dis_style_register, "%s",
riscv_gpr_names[EXTRACT_OPERAND (CRS2, l)]);
break;
case 'o':
case 'j':
if (((l & MASK_C_ADDI) == MATCH_C_ADDI) && rd != 0)
maybe_print_address (pd, rd, EXTRACT_CITYPE_IMM (l), 0);
if (info->mach == bfd_mach_riscv64
&& ((l & MASK_C_ADDIW) == MATCH_C_ADDIW) && rd != 0)
maybe_print_address (pd, rd, EXTRACT_CITYPE_IMM (l), 1);
print (info->stream, dis_style_immediate, "%d",
(int)EXTRACT_CITYPE_IMM (l));
break;
case 'k':
print (info->stream, dis_style_address_offset, "%d",
(int)EXTRACT_CLTYPE_LW_IMM (l));
break;
case 'l':
print (info->stream, dis_style_address_offset, "%d",
(int)EXTRACT_CLTYPE_LD_IMM (l));
break;
case 'm':
print (info->stream, dis_style_address_offset, "%d",
(int)EXTRACT_CITYPE_LWSP_IMM (l));
break;
case 'n':
print (info->stream, dis_style_address_offset, "%d",
(int)EXTRACT_CITYPE_LDSP_IMM (l));
break;
case 'K':
print (info->stream, dis_style_immediate, "%d",
(int)EXTRACT_CIWTYPE_ADDI4SPN_IMM (l));
break;
case 'L':
print (info->stream, dis_style_immediate, "%d",
(int)EXTRACT_CITYPE_ADDI16SP_IMM (l));
break;
case 'M':
print (info->stream, dis_style_address_offset, "%d",
(int)EXTRACT_CSSTYPE_SWSP_IMM (l));
break;
case 'N':
print (info->stream, dis_style_address_offset, "%d",
(int)EXTRACT_CSSTYPE_SDSP_IMM (l));
break;
case 'p':
info->target = EXTRACT_CBTYPE_IMM (l) + pc;
(*info->print_address_func) (info->target, info);
break;
case 'a':
info->target = EXTRACT_CJTYPE_IMM (l) + pc;
(*info->print_address_func) (info->target, info);
break;
case 'u':
print (info->stream, dis_style_immediate, "0x%x",
(int)(EXTRACT_CITYPE_IMM (l) & (RISCV_BIGIMM_REACH-1)));
break;
case '>':
print (info->stream, dis_style_immediate, "0x%x",
(int)EXTRACT_CITYPE_IMM (l) & 0x3f);
break;
case '<':
print (info->stream, dis_style_immediate, "0x%x",
(int)EXTRACT_CITYPE_IMM (l) & 0x1f);
break;
case 'T': /* Floating-point RS2. */
print (info->stream, dis_style_register, "%s",
riscv_fpr_names[EXTRACT_OPERAND (CRS2, l)]);
break;
case 'D': /* Floating-point RS2 x8-x15. */
print (info->stream, dis_style_register, "%s",
riscv_fpr_names[EXTRACT_OPERAND (CRS2S, l) + 8]);
break;
}
break;
case 'V': /* RVV */
switch (*++oparg)
{
case 'd':
case 'f':
print (info->stream, dis_style_register, "%s",
riscv_vecr_names_numeric[EXTRACT_OPERAND (VD, l)]);
break;
case 'e':
if (!EXTRACT_OPERAND (VWD, l))
print (info->stream, dis_style_register, "%s",
riscv_gpr_names[0]);
else
print (info->stream, dis_style_register, "%s",
riscv_vecr_names_numeric[EXTRACT_OPERAND (VD, l)]);
break;
case 's':
print (info->stream, dis_style_register, "%s",
riscv_vecr_names_numeric[EXTRACT_OPERAND (VS1, l)]);
break;
case 't':
case 'u': /* VS1 == VS2 already verified at this point. */
case 'v': /* VD == VS1 == VS2 already verified at this point. */
print (info->stream, dis_style_register, "%s",
riscv_vecr_names_numeric[EXTRACT_OPERAND (VS2, l)]);
break;
case '0':
print (info->stream, dis_style_register, "%s",
riscv_vecr_names_numeric[0]);
break;
case 'b':
case 'c':
{
int imm = (*oparg == 'b') ? EXTRACT_RVV_VB_IMM (l)
: EXTRACT_RVV_VC_IMM (l);
unsigned int imm_vlmul = EXTRACT_OPERAND (VLMUL, imm);
unsigned int imm_vsew = EXTRACT_OPERAND (VSEW, imm);
unsigned int imm_vta = EXTRACT_OPERAND (VTA, imm);
unsigned int imm_vma = EXTRACT_OPERAND (VMA, imm);
unsigned int imm_vtype_res = (imm >> 8);
if (imm_vsew < ARRAY_SIZE (riscv_vsew)
&& imm_vlmul < ARRAY_SIZE (riscv_vlmul)
&& imm_vta < ARRAY_SIZE (riscv_vta)
&& imm_vma < ARRAY_SIZE (riscv_vma)
&& !imm_vtype_res
&& riscv_vsew[imm_vsew] != NULL
&& riscv_vlmul[imm_vlmul] != NULL)
print (info->stream, dis_style_text, "%s,%s,%s,%s",
riscv_vsew[imm_vsew],
riscv_vlmul[imm_vlmul], riscv_vta[imm_vta],
riscv_vma[imm_vma]);
else
print (info->stream, dis_style_immediate, "%d", imm);
}
break;
case 'i':
print (info->stream, dis_style_immediate, "%d",
(int)EXTRACT_RVV_VI_IMM (l));
break;
case 'j':
print (info->stream, dis_style_immediate, "%d",
(int)EXTRACT_RVV_VI_UIMM (l));
break;
case 'k':
print (info->stream, dis_style_immediate, "%d",
(int)EXTRACT_RVV_OFFSET (l));
break;
case 'm':
if (! EXTRACT_OPERAND (VMASK, l))
print (info->stream, dis_style_register, ",%s",
riscv_vecm_names_numeric[0]);
break;
}
break;
case ',':
case '(':
case ')':
case '[':
case ']':
print (info->stream, dis_style_text, "%c", *oparg);
break;
case '0':
/* Only print constant 0 if it is the last argument. */
if (!oparg[1])
print (info->stream, dis_style_immediate, "0");
break;
case 'b':
case 's':
if ((l & MASK_JALR) == MATCH_JALR)
maybe_print_address (pd, rs1, 0, 0);
print (info->stream, dis_style_register, "%s", riscv_gpr_names[rs1]);
break;
case 't':
print (info->stream, dis_style_register, "%s",
riscv_gpr_names[EXTRACT_OPERAND (RS2, l)]);
break;
case 'u':
print (info->stream, dis_style_immediate, "0x%x",
(unsigned)EXTRACT_UTYPE_IMM (l) >> RISCV_IMM_BITS);
break;
case 'm':
arg_print (info, EXTRACT_OPERAND (RM, l),
riscv_rm, ARRAY_SIZE (riscv_rm));
break;
case 'P':
arg_print (info, EXTRACT_OPERAND (PRED, l),
riscv_pred_succ, ARRAY_SIZE (riscv_pred_succ));
break;
case 'Q':
arg_print (info, EXTRACT_OPERAND (SUCC, l),
riscv_pred_succ, ARRAY_SIZE (riscv_pred_succ));
break;
case 'o':
maybe_print_address (pd, rs1, EXTRACT_ITYPE_IMM (l), 0);
/* Fall through. */
case 'j':
if (((l & MASK_ADDI) == MATCH_ADDI && rs1 != 0)
|| (l & MASK_JALR) == MATCH_JALR)
maybe_print_address (pd, rs1, EXTRACT_ITYPE_IMM (l), 0);
if (info->mach == bfd_mach_riscv64
&& ((l & MASK_ADDIW) == MATCH_ADDIW) && rs1 != 0)
maybe_print_address (pd, rs1, EXTRACT_ITYPE_IMM (l), 1);
print (info->stream, dis_style_immediate, "%d",
(int)EXTRACT_ITYPE_IMM (l));
break;
case 'q':
maybe_print_address (pd, rs1, EXTRACT_STYPE_IMM (l), 0);
print (info->stream, dis_style_address_offset, "%d",
(int)EXTRACT_STYPE_IMM (l));
break;
case 'f':
print (info->stream, dis_style_address_offset, "%d",
(int)EXTRACT_STYPE_IMM (l));
break;
case 'a':
info->target = EXTRACT_JTYPE_IMM (l) + pc;
(*info->print_address_func) (info->target, info);
break;
case 'p':
info->target = EXTRACT_BTYPE_IMM (l) + pc;
(*info->print_address_func) (info->target, info);
break;
case 'd':
if ((l & MASK_AUIPC) == MATCH_AUIPC)
pd->hi_addr[rd] = pc + EXTRACT_UTYPE_IMM (l);
else if ((l & MASK_LUI) == MATCH_LUI)
pd->hi_addr[rd] = EXTRACT_UTYPE_IMM (l);
else if ((l & MASK_C_LUI) == MATCH_C_LUI)
pd->hi_addr[rd] = EXTRACT_CITYPE_LUI_IMM (l);
print (info->stream, dis_style_register, "%s", riscv_gpr_names[rd]);
break;
case 'y':
print (info->stream, dis_style_text, "0x%x",
(int)EXTRACT_OPERAND (BS, l));
break;
case 'z':
print (info->stream, dis_style_register, "%s", riscv_gpr_names[0]);
break;
case '>':
print (info->stream, dis_style_immediate, "0x%x",
(int)EXTRACT_OPERAND (SHAMT, l));
break;
case '<':
print (info->stream, dis_style_immediate, "0x%x",
(int)EXTRACT_OPERAND (SHAMTW, l));
break;
case 'S':
case 'U':
print (info->stream, dis_style_register, "%s", riscv_fpr_names[rs1]);
break;
case 'T':
print (info->stream, dis_style_register, "%s",
riscv_fpr_names[EXTRACT_OPERAND (RS2, l)]);
break;
case 'D':
print (info->stream, dis_style_register, "%s", riscv_fpr_names[rd]);
break;
case 'R':
print (info->stream, dis_style_register, "%s",
riscv_fpr_names[EXTRACT_OPERAND (RS3, l)]);
break;
case 'E':
{
static const char *riscv_csr_hash[4096]; /* Total 2^12 CSRs. */
static bool init_csr = false;
unsigned int csr = EXTRACT_OPERAND (CSR, l);
if (!init_csr)
{
unsigned int i;
for (i = 0; i < 4096; i++)
riscv_csr_hash[i] = NULL;
/* Set to the newest privileged version. */
if (default_priv_spec == PRIV_SPEC_CLASS_NONE)
default_priv_spec = PRIV_SPEC_CLASS_DRAFT - 1;
#define DECLARE_CSR(name, num, class, define_version, abort_version) \
if (riscv_csr_hash[num] == NULL \
&& ((define_version == PRIV_SPEC_CLASS_NONE \
&& abort_version == PRIV_SPEC_CLASS_NONE) \
|| (default_priv_spec >= define_version \
&& default_priv_spec < abort_version))) \
riscv_csr_hash[num] = #name;
#define DECLARE_CSR_ALIAS(name, num, class, define_version, abort_version) \
DECLARE_CSR (name, num, class, define_version, abort_version)
#include "opcode/riscv-opc.h"
#undef DECLARE_CSR
}
if (riscv_csr_hash[csr] != NULL)
print (info->stream, dis_style_text, "%s", riscv_csr_hash[csr]);
else
print (info->stream, dis_style_text, "0x%x", csr);
break;
}
case 'Y':
print (info->stream, dis_style_text, "0x%x",
(int) EXTRACT_OPERAND (RNUM, l));
break;
case 'Z':
print (info->stream, dis_style_text, "%d", rs1);
break;
default:
/* xgettext:c-format */
print (info->stream, dis_style_text,
_("# internal error, undefined modifier (%c)"),
*opargStart);
return;
}
}
}
/* Print the RISC-V instruction at address MEMADDR in debugged memory,
on using INFO. Returns length of the instruction, in bytes.
BIGENDIAN must be 1 if this is big-endian code, 0 if
this is little-endian code. */
static int
riscv_disassemble_insn (bfd_vma memaddr, insn_t word, disassemble_info *info)
{
const struct riscv_opcode *op;
static bool init = 0;
static const struct riscv_opcode *riscv_hash[OP_MASK_OP + 1];
struct riscv_private_data *pd;
int insnlen;
#define OP_HASH_IDX(i) ((i) & (riscv_insn_length (i) == 2 ? 0x3 : OP_MASK_OP))
/* Build a hash table to shorten the search time. */
if (! init)
{
for (op = riscv_opcodes; op->name; op++)
if (!riscv_hash[OP_HASH_IDX (op->match)])
riscv_hash[OP_HASH_IDX (op->match)] = op;
init = 1;
}
if (info->private_data == NULL)
{
int i;
pd = info->private_data = xcalloc (1, sizeof (struct riscv_private_data));
pd->gp = -1;
pd->print_addr = -1;
for (i = 0; i < (int)ARRAY_SIZE (pd->hi_addr); i++)
pd->hi_addr[i] = -1;
for (i = 0; i < info->symtab_size; i++)
if (strcmp (bfd_asymbol_name (info->symtab[i]), RISCV_GP_SYMBOL) == 0)
pd->gp = bfd_asymbol_value (info->symtab[i]);
}
else
pd = info->private_data;
insnlen = riscv_insn_length (word);
/* RISC-V instructions are always little-endian. */
info->endian_code = BFD_ENDIAN_LITTLE;
info->bytes_per_chunk = insnlen % 4 == 0 ? 4 : 2;
info->bytes_per_line = 8;
/* We don't support constant pools, so this must be code. */
info->display_endian = info->endian_code;
info->insn_info_valid = 1;
info->branch_delay_insns = 0;
info->data_size = 0;
info->insn_type = dis_nonbranch;
info->target = 0;
info->target2 = 0;
op = riscv_hash[OP_HASH_IDX (word)];
if (op != NULL)
{
/* If XLEN is not known, get its value from the ELF class. */
if (info->mach == bfd_mach_riscv64)
xlen = 64;
else if (info->mach == bfd_mach_riscv32)
xlen = 32;
else if (info->section != NULL)
{
Elf_Internal_Ehdr *ehdr = elf_elfheader (info->section->owner);
xlen = ehdr->e_ident[EI_CLASS] == ELFCLASS64 ? 64 : 32;
}
/* If arch has ZFINX flags, use gpr for disassemble. */
if(riscv_subset_supports (&riscv_rps_dis, "zfinx"))
riscv_fpr_names = riscv_gpr_names;
for (; op->name; op++)
{
/* Does the opcode match? */
if (! (op->match_func) (op, word))
continue;
/* Is this a pseudo-instruction and may we print it as such? */
if (no_aliases && (op->pinfo & INSN_ALIAS))
continue;
/* Is this instruction restricted to a certain value of XLEN? */
if ((op->xlen_requirement != 0) && (op->xlen_requirement != xlen))
continue;
if (!riscv_multi_subset_supports (&riscv_rps_dis, op->insn_class))
continue;
/* It's a match. */
(*info->fprintf_styled_func) (info->stream, dis_style_mnemonic,
"%s", op->name);
print_insn_args (op->args, word, memaddr, info);
/* Try to disassemble multi-instruction addressing sequences. */
if (pd->print_addr != (bfd_vma)-1)
{
info->target = pd->print_addr;
(*info->fprintf_styled_func)
(info->stream, dis_style_comment_start, " # ");
(*info->print_address_func) (info->target, info);
pd->print_addr = -1;
}
/* Finish filling out insn_info fields. */
switch (op->pinfo & INSN_TYPE)
{
case INSN_BRANCH:
info->insn_type = dis_branch;
break;
case INSN_CONDBRANCH:
info->insn_type = dis_condbranch;
break;
case INSN_JSR:
info->insn_type = dis_jsr;
break;
case INSN_DREF:
info->insn_type = dis_dref;
break;
default:
break;
}
if (op->pinfo & INSN_DATA_SIZE)
{
int size = ((op->pinfo & INSN_DATA_SIZE)
>> INSN_DATA_SIZE_SHIFT);
info->data_size = 1 << (size - 1);
}
return insnlen;
}
}
/* We did not find a match, so just print the instruction bits. */
info->insn_type = dis_noninsn;
switch (insnlen)
{
case 2:
case 4:
case 8:
(*info->fprintf_styled_func)
(info->stream, dis_style_assembler_directive, ".%dbyte\t", insnlen);
(*info->fprintf_styled_func) (info->stream, dis_style_immediate,
"0x%llx", (unsigned long long) word);
break;
default:
{
int i;
(*info->fprintf_styled_func)
(info->stream, dis_style_assembler_directive, ".byte\t");
for (i = 0; i < insnlen; ++i)
{
if (i > 0)
(*info->fprintf_styled_func) (info->stream, dis_style_text,
", ");
(*info->fprintf_styled_func) (info->stream, dis_style_immediate,
"0x%02x",
(unsigned int) (word & 0xff));
word >>= 8;
}
}
break;
}
return insnlen;
}
/* Return true if we find the suitable mapping symbol,
and also update the STATE. Otherwise, return false. */
static bool
riscv_get_map_state (int n,
enum riscv_seg_mstate *state,
struct disassemble_info *info)
{
const char *name;
/* If the symbol is in a different section, ignore it. */
if (info->section != NULL
&& info->section != info->symtab[n]->section)
return false;
name = bfd_asymbol_name(info->symtab[n]);
if (strcmp (name, "$x") == 0)
*state = MAP_INSN;
else if (strcmp (name, "$d") == 0)
*state = MAP_DATA;
else
return false;
return true;
}
/* Check the sorted symbol table (sorted by the symbol value), find the
suitable mapping symbols. */
static enum riscv_seg_mstate
riscv_search_mapping_symbol (bfd_vma memaddr,
struct disassemble_info *info)
{
enum riscv_seg_mstate mstate;
bool from_last_map_symbol;
bool found = false;
int symbol = -1;
int n;
/* Decide whether to print the data or instruction by default, in case
we can not find the corresponding mapping symbols. */
mstate = MAP_DATA;
if ((info->section
&& info->section->flags & SEC_CODE)
|| !info->section)
mstate = MAP_INSN;
if (info->symtab_size == 0
|| bfd_asymbol_flavour (*info->symtab) != bfd_target_elf_flavour)
return mstate;
/* Reset the last_map_symbol if we start to dump a new section. */
if (memaddr <= 0)
last_map_symbol = -1;
/* If the last stop offset is different from the current one, then
don't use the last_map_symbol to search. We usually reset the
info->stop_offset when handling a new section. */
from_last_map_symbol = (last_map_symbol >= 0
&& info->stop_offset == last_stop_offset);
/* Start scanning at the start of the function, or wherever
we finished last time. */
n = info->symtab_pos + 1;
if (from_last_map_symbol && n >= last_map_symbol)
n = last_map_symbol;
/* Find the suitable mapping symbol to dump. */
for (; n < info->symtab_size; n++)
{
bfd_vma addr = bfd_asymbol_value (info->symtab[n]);
/* We have searched all possible symbols in the range. */
if (addr > memaddr)
break;
if (riscv_get_map_state (n, &mstate, info))
{
symbol = n;
found = true;
/* Do not stop searching, in case there are some mapping
symbols have the same value, but have different names.
Use the last one. */
}
}
/* We can not find the suitable mapping symbol above. Therefore, we
look forwards and try to find it again, but don't go pass the start
of the section. Otherwise a data section without mapping symbols
can pick up a text mapping symbol of a preceeding section. */
if (!found)
{
n = info->symtab_pos;
if (from_last_map_symbol && n >= last_map_symbol)
n = last_map_symbol;
for (; n >= 0; n--)
{
bfd_vma addr = bfd_asymbol_value (info->symtab[n]);
/* We have searched all possible symbols in the range. */
if (addr < (info->section ? info->section->vma : 0))
break;
/* Stop searching once we find the closed mapping symbol. */
if (riscv_get_map_state (n, &mstate, info))
{
symbol = n;
found = true;
break;
}
}
}
/* Save the information for next use. */
last_map_symbol = symbol;
last_stop_offset = info->stop_offset;
return mstate;
}
/* Decide which data size we should print. */
static bfd_vma
riscv_data_length (bfd_vma memaddr,
disassemble_info *info)
{
bfd_vma length;
bool found = false;
length = 4;
if (info->symtab_size != 0
&& bfd_asymbol_flavour (*info->symtab) == bfd_target_elf_flavour
&& last_map_symbol >= 0)
{
int n;
enum riscv_seg_mstate m = MAP_NONE;
for (n = last_map_symbol + 1; n < info->symtab_size; n++)
{
bfd_vma addr = bfd_asymbol_value (info->symtab[n]);
if (addr > memaddr
&& riscv_get_map_state (n, &m, info))
{
if (addr - memaddr < length)
length = addr - memaddr;
found = true;
break;
}
}
}
if (!found)
{
/* Do not set the length which exceeds the section size. */
bfd_vma offset = info->section->vma + info->section->size;
offset -= memaddr;
length = (offset < length) ? offset : length;
}
length = length == 3 ? 2 : length;
return length;
}
/* Dump the data contents. */
static int
riscv_disassemble_data (bfd_vma memaddr ATTRIBUTE_UNUSED,
insn_t data,
disassemble_info *info)
{
info->display_endian = info->endian;
switch (info->bytes_per_chunk)
{
case 1:
info->bytes_per_line = 6;
(*info->fprintf_styled_func)
(info->stream, dis_style_assembler_directive, ".byte\t");
(*info->fprintf_styled_func)
(info->stream, dis_style_assembler_directive, "0x%02llx",
(unsigned long long) data);
break;
case 2:
info->bytes_per_line = 8;
(*info->fprintf_styled_func)
(info->stream, dis_style_assembler_directive, ".short\t");
(*info->fprintf_styled_func)
(info->stream, dis_style_immediate, "0x%04llx",
(unsigned long long) data);
break;
case 4:
info->bytes_per_line = 8;
(*info->fprintf_styled_func)
(info->stream, dis_style_assembler_directive, ".word\t");
(*info->fprintf_styled_func)
(info->stream, dis_style_immediate, "0x%08llx",
(unsigned long long) data);
break;
case 8:
info->bytes_per_line = 8;
(*info->fprintf_styled_func)
(info->stream, dis_style_assembler_directive, ".dword\t");
(*info->fprintf_styled_func)
(info->stream, dis_style_immediate, "0x%016llx",
(unsigned long long) data);
break;
default:
abort ();
}
return info->bytes_per_chunk;
}
int
print_insn_riscv (bfd_vma memaddr, struct disassemble_info *info)
{
bfd_byte packet[8];
insn_t insn = 0;
bfd_vma dump_size;
int status;
enum riscv_seg_mstate mstate;
int (*riscv_disassembler) (bfd_vma, insn_t, struct disassemble_info *);
if (info->disassembler_options != NULL)
{
parse_riscv_dis_options (info->disassembler_options);
/* Avoid repeatedly parsing the options. */
info->disassembler_options = NULL;
}
else if (riscv_gpr_names == NULL)
set_default_riscv_dis_options ();
mstate = riscv_search_mapping_symbol (memaddr, info);
/* Save the last mapping state. */
last_map_state = mstate;
/* Set the size to dump. */
if (mstate == MAP_DATA
&& (info->flags & DISASSEMBLE_DATA) == 0)
{
dump_size = riscv_data_length (memaddr, info);
info->bytes_per_chunk = dump_size;
riscv_disassembler = riscv_disassemble_data;
}
else
{
/* Get the first 2-bytes to check the lenghth of instruction. */
status = (*info->read_memory_func) (memaddr, packet, 2, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return status;
}
insn = (insn_t) bfd_getl16 (packet);
dump_size = riscv_insn_length (insn);
riscv_disassembler = riscv_disassemble_insn;
}
/* Fetch the instruction to dump. */
status = (*info->read_memory_func) (memaddr, packet, dump_size, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return status;
}
insn = (insn_t) bfd_get_bits (packet, dump_size * 8, false);
return (*riscv_disassembler) (memaddr, insn, info);
}
disassembler_ftype
riscv_get_disassembler (bfd *abfd)
{
const char *default_arch = "rv64gc";
if (abfd && bfd_get_flavour (abfd) == bfd_target_elf_flavour)
{
const char *sec_name = get_elf_backend_data (abfd)->obj_attrs_section;
if (bfd_get_section_by_name (abfd, sec_name) != NULL)
{
obj_attribute *attr = elf_known_obj_attributes_proc (abfd);
unsigned int Tag_a = Tag_RISCV_priv_spec;
unsigned int Tag_b = Tag_RISCV_priv_spec_minor;
unsigned int Tag_c = Tag_RISCV_priv_spec_revision;
riscv_get_priv_spec_class_from_numbers (attr[Tag_a].i,
attr[Tag_b].i,
attr[Tag_c].i,
&default_priv_spec);
default_arch = attr[Tag_RISCV_arch].s;
}
}
riscv_release_subset_list (&riscv_subsets);
riscv_parse_subset (&riscv_rps_dis, default_arch);
return print_insn_riscv;
}
/* Prevent use of the fake labels that are generated as part of the DWARF
and for relaxable relocations in the assembler. */
bool
riscv_symbol_is_valid (asymbol * sym,
struct disassemble_info * info ATTRIBUTE_UNUSED)
{
const char * name;
if (sym == NULL)
return false;
name = bfd_asymbol_name (sym);
return (strcmp (name, RISCV_FAKE_LABEL_NAME) != 0
&& !riscv_elf_is_mapping_symbols (name));
}
/* Indices into option argument vector for options accepting an argument.
Use RISCV_OPTION_ARG_NONE for options accepting no argument. */
typedef enum
{
RISCV_OPTION_ARG_NONE = -1,
RISCV_OPTION_ARG_PRIV_SPEC,
RISCV_OPTION_ARG_COUNT
} riscv_option_arg_t;
/* Valid RISCV disassembler options. */
static struct
{
const char *name;
const char *description;
riscv_option_arg_t arg;
} riscv_options[] =
{
{ "numeric",
N_("Print numeric register names, rather than ABI names."),
RISCV_OPTION_ARG_NONE },
{ "no-aliases",
N_("Disassemble only into canonical instructions."),
RISCV_OPTION_ARG_NONE },
{ "priv-spec=",
N_("Print the CSR according to the chosen privilege spec."),
RISCV_OPTION_ARG_PRIV_SPEC }
};
/* Build the structure representing valid RISCV disassembler options.
This is done dynamically for maintenance ease purpose; a static
initializer would be unreadable. */
const disasm_options_and_args_t *
disassembler_options_riscv (void)
{
static disasm_options_and_args_t *opts_and_args;
if (opts_and_args == NULL)
{
size_t num_options = ARRAY_SIZE (riscv_options);
size_t num_args = RISCV_OPTION_ARG_COUNT;
disasm_option_arg_t *args;
disasm_options_t *opts;
size_t i, priv_spec_count;
args = XNEWVEC (disasm_option_arg_t, num_args + 1);
args[RISCV_OPTION_ARG_PRIV_SPEC].name = "SPEC";
priv_spec_count = PRIV_SPEC_CLASS_DRAFT - PRIV_SPEC_CLASS_NONE - 1;
args[RISCV_OPTION_ARG_PRIV_SPEC].values
= XNEWVEC (const char *, priv_spec_count + 1);
for (i = 0; i < priv_spec_count; i++)
args[RISCV_OPTION_ARG_PRIV_SPEC].values[i]
= riscv_priv_specs[i].name;
/* The array we return must be NULL terminated. */
args[RISCV_OPTION_ARG_PRIV_SPEC].values[i] = NULL;
/* The array we return must be NULL terminated. */
args[num_args].name = NULL;
args[num_args].values = NULL;
opts_and_args = XNEW (disasm_options_and_args_t);
opts_and_args->args = args;
opts = &opts_and_args->options;
opts->name = XNEWVEC (const char *, num_options + 1);
opts->description = XNEWVEC (const char *, num_options + 1);
opts->arg = XNEWVEC (const disasm_option_arg_t *, num_options + 1);
for (i = 0; i < num_options; i++)
{
opts->name[i] = riscv_options[i].name;
opts->description[i] = _(riscv_options[i].description);
if (riscv_options[i].arg != RISCV_OPTION_ARG_NONE)
opts->arg[i] = &args[riscv_options[i].arg];
else
opts->arg[i] = NULL;
}
/* The array we return must be NULL terminated. */
opts->name[i] = NULL;
opts->description[i] = NULL;
opts->arg[i] = NULL;
}
return opts_and_args;
}
void
print_riscv_disassembler_options (FILE *stream)
{
const disasm_options_and_args_t *opts_and_args;
const disasm_option_arg_t *args;
const disasm_options_t *opts;
size_t max_len = 0;
size_t i;
size_t j;
opts_and_args = disassembler_options_riscv ();
opts = &opts_and_args->options;
args = opts_and_args->args;
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");
/* Compute the length of the longest option name. */
for (i = 0; opts->name[i] != NULL; i++)
{
size_t len = strlen (opts->name[i]);
if (opts->arg[i] != NULL)
len += strlen (opts->arg[i]->name);
if (max_len < len)
max_len = len;
}
for (i = 0, max_len++; opts->name[i] != NULL; i++)
{
fprintf (stream, " %s", opts->name[i]);
if (opts->arg[i] != NULL)
fprintf (stream, "%s", opts->arg[i]->name);
if (opts->description[i] != NULL)
{
size_t len = strlen (opts->name[i]);
if (opts->arg != NULL && opts->arg[i] != NULL)
len += strlen (opts->arg[i]->name);
fprintf (stream, "%*c %s", (int) (max_len - len), ' ',
opts->description[i]);
}
fprintf (stream, "\n");
}
for (i = 0; args[i].name != NULL; i++)
{
fprintf (stream, _("\n\
For the options above, the following values are supported for \"%s\":\n "),
args[i].name);
for (j = 0; args[i].values[j] != NULL; j++)
fprintf (stream, " %s", args[i].values[j]);
fprintf (stream, _("\n"));
}
fprintf (stream, _("\n"));
}
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