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521 lines
14 KiB
C
521 lines
14 KiB
C
/* Opcode printing code for the WebAssembly target
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Copyright (C) 2017-2018 Free Software Foundation, Inc.
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This file is part of libopcodes.
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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 of the License, or
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(at your option) 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; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "disassemble.h"
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#include "opintl.h"
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#include "safe-ctype.h"
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#include "floatformat.h"
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#include "libiberty.h"
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#include "elf-bfd.h"
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#include "elf/internal.h"
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#include "elf/wasm32.h"
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#include <stdint.h>
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/* Type names for blocks and signatures. */
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#define BLOCK_TYPE_NONE 0x40
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#define BLOCK_TYPE_I32 0x7f
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#define BLOCK_TYPE_I64 0x7e
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#define BLOCK_TYPE_F32 0x7d
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#define BLOCK_TYPE_F64 0x7c
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enum wasm_class
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{
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wasm_typed,
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wasm_special,
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wasm_break,
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wasm_break_if,
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wasm_break_table,
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wasm_return,
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wasm_call,
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wasm_call_import,
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wasm_call_indirect,
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wasm_get_local,
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wasm_set_local,
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wasm_tee_local,
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wasm_drop,
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wasm_constant_i32,
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wasm_constant_i64,
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wasm_constant_f32,
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wasm_constant_f64,
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wasm_unary,
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wasm_binary,
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wasm_conv,
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wasm_load,
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wasm_store,
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wasm_select,
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wasm_relational,
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wasm_eqz,
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wasm_current_memory,
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wasm_grow_memory,
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wasm_signature
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};
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struct wasm32_private_data
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{
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bfd_boolean print_registers;
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bfd_boolean print_well_known_globals;
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/* Limit valid symbols to those with a given prefix. */
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const char *section_prefix;
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};
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typedef struct
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{
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const char *name;
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const char *description;
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} wasm32_options_t;
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static const wasm32_options_t options[] =
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{
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{ "registers", N_("Disassemble \"register\" names") },
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{ "globals", N_("Name well-known globals") },
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};
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#define WASM_OPCODE(opcode, name, intype, outtype, clas, signedness) \
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{ name, wasm_ ## clas, opcode },
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struct wasm32_opcode_s
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{
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const char *name;
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enum wasm_class clas;
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unsigned char opcode;
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} wasm32_opcodes[] =
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{
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#include "opcode/wasm.h"
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{ NULL, 0, 0 }
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};
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/* Parse the disassembler options in OPTS and initialize INFO. */
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static void
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parse_wasm32_disassembler_options (struct disassemble_info *info,
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const char *opts)
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{
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struct wasm32_private_data *private = info->private_data;
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while (opts != NULL)
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{
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if (CONST_STRNEQ (opts, "registers"))
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private->print_registers = TRUE;
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else if (CONST_STRNEQ (opts, "globals"))
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private->print_well_known_globals = TRUE;
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opts = strchr (opts, ',');
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if (opts)
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opts++;
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}
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}
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/* Check whether SYM is valid. Special-case absolute symbols, which
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are unhelpful to print, and arguments to a "call" insn, which we
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want to be in a section matching a given prefix. */
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static bfd_boolean
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wasm32_symbol_is_valid (asymbol *sym,
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struct disassemble_info *info)
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{
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struct wasm32_private_data *private_data = info->private_data;
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if (sym == NULL)
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return FALSE;
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if (strcmp(sym->section->name, "*ABS*") == 0)
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return FALSE;
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if (private_data && private_data->section_prefix != NULL
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&& strncmp (sym->section->name, private_data->section_prefix,
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strlen (private_data->section_prefix)))
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return FALSE;
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return TRUE;
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}
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/* Initialize the disassembler structures for INFO. */
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void
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disassemble_init_wasm32 (struct disassemble_info *info)
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{
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if (info->private_data == NULL)
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{
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static struct wasm32_private_data private;
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private.print_registers = FALSE;
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private.print_well_known_globals = FALSE;
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private.section_prefix = NULL;
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info->private_data = &private;
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}
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if (info->disassembler_options)
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{
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parse_wasm32_disassembler_options (info, info->disassembler_options);
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info->disassembler_options = NULL;
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}
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info->symbol_is_valid = wasm32_symbol_is_valid;
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}
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/* Read an LEB128-encoded integer from INFO at address PC, reading one
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byte at a time. Set ERROR_RETURN if no complete integer could be
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read, LENGTH_RETURN to the number oof bytes read (including bytes
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in incomplete numbers). SIGN means interpret the number as
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SLEB128. Unfortunately, this is a duplicate of wasm-module.c's
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wasm_read_leb128 (). */
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static uint64_t
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wasm_read_leb128 (bfd_vma pc,
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struct disassemble_info * info,
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bfd_boolean * error_return,
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unsigned int * length_return,
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bfd_boolean sign)
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{
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uint64_t result = 0;
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unsigned int num_read = 0;
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unsigned int shift = 0;
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unsigned char byte = 0;
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bfd_boolean success = FALSE;
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while (info->read_memory_func (pc + num_read, &byte, 1, info) == 0)
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{
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num_read++;
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result |= ((bfd_vma) (byte & 0x7f)) << shift;
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shift += 7;
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if ((byte & 0x80) == 0)
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{
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success = TRUE;
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break;
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}
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}
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if (length_return != NULL)
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*length_return = num_read;
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if (error_return != NULL)
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*error_return = ! success;
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if (sign && (shift < 8 * sizeof (result)) && (byte & 0x40))
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result |= -((uint64_t) 1 << shift);
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return result;
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}
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/* Read a 32-bit IEEE float from PC using INFO, convert it to a host
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double, and store it at VALUE. */
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static int
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read_f32 (double *value, bfd_vma pc, struct disassemble_info *info)
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{
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bfd_byte buf[4];
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if (info->read_memory_func (pc, buf, sizeof (buf), info))
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return -1;
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floatformat_to_double (&floatformat_ieee_single_little, buf,
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value);
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return sizeof (buf);
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}
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/* Read a 64-bit IEEE float from PC using INFO, convert it to a host
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double, and store it at VALUE. */
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static int
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read_f64 (double *value, bfd_vma pc, struct disassemble_info *info)
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{
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bfd_byte buf[8];
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if (info->read_memory_func (pc, buf, sizeof (buf), info))
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return -1;
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floatformat_to_double (&floatformat_ieee_double_little, buf,
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value);
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return sizeof (buf);
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}
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/* Main disassembly routine. Disassemble insn at PC using INFO. */
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int
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print_insn_wasm32 (bfd_vma pc, struct disassemble_info *info)
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{
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unsigned char opcode;
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struct wasm32_opcode_s *op;
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bfd_byte buffer[16];
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void *stream = info->stream;
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fprintf_ftype prin = info->fprintf_func;
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struct wasm32_private_data *private_data = info->private_data;
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long long constant = 0;
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double fconstant = 0.0;
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long flags = 0;
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long offset = 0;
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long depth = 0;
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long index = 0;
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long target_count = 0;
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long block_type = 0;
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int len = 1;
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int ret = 0;
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unsigned int bytes_read = 0;
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int i;
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const char *locals[] =
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{
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"$dpc", "$sp1", "$r0", "$r1", "$rpc", "$pc0",
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"$rp", "$fp", "$sp",
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"$r2", "$r3", "$r4", "$r5", "$r6", "$r7",
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"$i0", "$i1", "$i2", "$i3", "$i4", "$i5", "$i6", "$i7",
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"$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7",
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};
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int nlocals = ARRAY_SIZE (locals);
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const char *globals[] =
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{
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"$got", "$plt", "$gpo"
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};
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int nglobals = ARRAY_SIZE (globals);
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bfd_boolean error = FALSE;
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if (info->read_memory_func (pc, buffer, 1, info))
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return -1;
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opcode = buffer[0];
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for (op = wasm32_opcodes; op->name; op++)
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if (op->opcode == opcode)
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break;
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if (!op->name)
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{
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prin (stream, "\t.byte 0x%02x\n", buffer[0]);
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return 1;
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}
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else
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{
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len = 1;
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prin (stream, "\t");
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prin (stream, "%s", op->name);
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if (op->clas == wasm_typed)
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{
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block_type = wasm_read_leb128
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(pc + len, info, &error, &bytes_read, FALSE);
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if (error)
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return -1;
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len += bytes_read;
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switch (block_type)
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{
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case BLOCK_TYPE_NONE:
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prin (stream, "[]");
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break;
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case BLOCK_TYPE_I32:
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prin (stream, "[i]");
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break;
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case BLOCK_TYPE_I64:
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prin (stream, "[l]");
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break;
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case BLOCK_TYPE_F32:
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prin (stream, "[f]");
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break;
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case BLOCK_TYPE_F64:
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prin (stream, "[d]");
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break;
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}
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}
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switch (op->clas)
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{
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case wasm_special:
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case wasm_eqz:
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case wasm_binary:
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case wasm_unary:
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case wasm_conv:
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case wasm_relational:
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case wasm_drop:
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case wasm_signature:
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case wasm_call_import:
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case wasm_typed:
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case wasm_select:
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break;
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case wasm_break_table:
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target_count = wasm_read_leb128
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(pc + len, info, &error, &bytes_read, FALSE);
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if (error)
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return -1;
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len += bytes_read;
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prin (stream, " %ld", target_count);
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for (i = 0; i < target_count + 1; i++)
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{
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long target = 0;
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target = wasm_read_leb128
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(pc + len, info, &error, &bytes_read, FALSE);
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if (error)
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return -1;
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len += bytes_read;
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prin (stream, " %ld", target);
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}
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break;
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case wasm_break:
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case wasm_break_if:
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depth = wasm_read_leb128
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(pc + len, info, &error, &bytes_read, FALSE);
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if (error)
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return -1;
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len += bytes_read;
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prin (stream, " %ld", depth);
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break;
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case wasm_return:
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break;
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case wasm_constant_i32:
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case wasm_constant_i64:
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constant = wasm_read_leb128
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(pc + len, info, &error, &bytes_read, TRUE);
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if (error)
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return -1;
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len += bytes_read;
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prin (stream, " %lld", constant);
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break;
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case wasm_constant_f32:
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/* This appears to be the best we can do, even though we're
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using host doubles for WebAssembly floats. */
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ret = read_f32 (&fconstant, pc + len, info);
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if (ret < 0)
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return -1;
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len += ret;
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prin (stream, " %.9g", fconstant);
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break;
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case wasm_constant_f64:
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ret = read_f64 (&fconstant, pc + len, info);
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if (ret < 0)
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return -1;
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len += ret;
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prin (stream, " %.17g", fconstant);
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break;
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case wasm_call:
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index = wasm_read_leb128
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(pc + len, info, &error, &bytes_read, FALSE);
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if (error)
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return -1;
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len += bytes_read;
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prin (stream, " ");
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private_data->section_prefix = ".space.function_index";
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(*info->print_address_func) ((bfd_vma) index, info);
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private_data->section_prefix = NULL;
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break;
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case wasm_call_indirect:
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constant = wasm_read_leb128
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(pc + len, info, &error, &bytes_read, FALSE);
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if (error)
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return -1;
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len += bytes_read;
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prin (stream, " %lld", constant);
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constant = wasm_read_leb128
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(pc + len, info, &error, &bytes_read, FALSE);
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if (error)
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return -1;
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len += bytes_read;
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prin (stream, " %lld", constant);
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break;
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case wasm_get_local:
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case wasm_set_local:
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case wasm_tee_local:
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constant = wasm_read_leb128
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(pc + len, info, &error, &bytes_read, FALSE);
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if (error)
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return -1;
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len += bytes_read;
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prin (stream, " %lld", constant);
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if (strcmp (op->name + 4, "local") == 0)
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{
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if (private_data->print_registers
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&& constant >= 0 && constant < nlocals)
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prin (stream, " <%s>", locals[constant]);
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}
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else
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{
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if (private_data->print_well_known_globals
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&& constant >= 0 && constant < nglobals)
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prin (stream, " <%s>", globals[constant]);
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}
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break;
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case wasm_grow_memory:
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case wasm_current_memory:
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constant = wasm_read_leb128
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(pc + len, info, &error, &bytes_read, FALSE);
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if (error)
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return -1;
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len += bytes_read;
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prin (stream, " %lld", constant);
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break;
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case wasm_load:
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case wasm_store:
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flags = wasm_read_leb128
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(pc + len, info, &error, &bytes_read, FALSE);
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if (error)
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return -1;
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len += bytes_read;
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offset = wasm_read_leb128
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(pc + len, info, &error, &bytes_read, FALSE);
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if (error)
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return -1;
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len += bytes_read;
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prin (stream, " a=%ld %ld", flags, offset);
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}
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}
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return len;
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}
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/* Print valid disassembler options to STREAM. */
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void
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print_wasm32_disassembler_options (FILE *stream)
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{
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unsigned int i, max_len = 0;
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fprintf (stream, _("\
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The following WebAssembly-specific disassembler options are supported for use\n\
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with the -M switch:\n"));
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for (i = 0; i < ARRAY_SIZE (options); i++)
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{
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unsigned int len = strlen (options[i].name);
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if (max_len < len)
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max_len = len;
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}
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for (i = 0, max_len++; i < ARRAY_SIZE (options); i++)
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fprintf (stream, " %s%*c %s\n",
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options[i].name,
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(int)(max_len - strlen (options[i].name)), ' ',
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_(options[i].description));
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}
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