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- /* BFD back-end for WebAssembly modules.
- Copyright (C) 2017-2022 Free Software Foundation, Inc.
- Based on srec.c, mmo.c, and binary.c
- This file is part of BFD, the Binary File Descriptor library.
- This program 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 of the License, or
- (at your option) any later version.
- This program 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; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
- MA 02110-1301, USA. */
- /* The WebAssembly module format is a simple object file format
- including up to 11 numbered sections, plus any number of named
- "custom" sections. It is described at:
- https://github.com/WebAssembly/design/blob/master/BinaryEncoding.md. */
- #include "sysdep.h"
- #include "bfd.h"
- #include "libiberty.h"
- #include "libbfd.h"
- #include "wasm-module.h"
- #include <limits.h>
- #ifndef CHAR_BIT
- #define CHAR_BIT 8
- #endif
- typedef struct
- {
- asymbol * symbols;
- bfd_size_type symcount;
- } tdata_type;
- static const char * const wasm_numbered_sections[] =
- {
- NULL, /* Custom section, different layout. */
- WASM_SECTION ( 1, "type"),
- WASM_SECTION ( 2, "import"),
- WASM_SECTION ( 3, "function"),
- WASM_SECTION ( 4, "table"),
- WASM_SECTION ( 5, "memory"),
- WASM_SECTION ( 6, "global"),
- WASM_SECTION ( 7, "export"),
- WASM_SECTION ( 8, "start"),
- WASM_SECTION ( 9, "element"),
- WASM_SECTION (10, "code"),
- WASM_SECTION (11, "data"),
- };
- #define WASM_NUMBERED_SECTIONS ARRAY_SIZE (wasm_numbered_sections)
- /* Resolve SECTION_CODE to a section name if there is one, NULL
- otherwise. */
- static const char *
- wasm_section_code_to_name (bfd_byte section_code)
- {
- if (section_code < WASM_NUMBERED_SECTIONS)
- return wasm_numbered_sections[section_code];
- return NULL;
- }
- /* Translate section name NAME to a section code, or 0 if it's a
- custom name. */
- static unsigned int
- wasm_section_name_to_code (const char *name)
- {
- unsigned i;
- for (i = 1; i < WASM_NUMBERED_SECTIONS; i++)
- if (strcmp (name, wasm_numbered_sections[i]) == 0)
- return i;
- return 0;
- }
- /* WebAssembly LEB128 integers are sufficiently like DWARF LEB128
- integers that we use _bfd_safe_read_leb128, but there are two
- points of difference:
- - WebAssembly requires a 32-bit value to be encoded in at most 5
- bytes, etc.
- - _bfd_safe_read_leb128 accepts incomplete LEB128 encodings at the
- end of the buffer, while these are invalid in WebAssembly.
- Those differences mean that we will accept some files that are
- invalid WebAssembly. */
- /* Read an LEB128-encoded integer from ABFD's I/O stream, reading one
- byte at a time. Set ERROR_RETURN if no complete integer could be
- read, LENGTH_RETURN to the number of bytes read (including bytes in
- incomplete numbers). SIGN means interpret the number as SLEB128. */
- static bfd_vma
- wasm_read_leb128 (bfd *abfd,
- bool *error_return,
- unsigned int *length_return,
- bool sign)
- {
- bfd_vma result = 0;
- unsigned int num_read = 0;
- unsigned int shift = 0;
- unsigned char byte = 0;
- unsigned char lost, mask;
- int status = 1;
- while (bfd_bread (&byte, 1, abfd) == 1)
- {
- num_read++;
- if (shift < CHAR_BIT * sizeof (result))
- {
- result |= ((bfd_vma) (byte & 0x7f)) << shift;
- /* These bits overflowed. */
- lost = byte ^ (result >> shift);
- /* And this is the mask of possible overflow bits. */
- mask = 0x7f ^ ((bfd_vma) 0x7f << shift >> shift);
- shift += 7;
- }
- else
- {
- lost = byte;
- mask = 0x7f;
- }
- if ((lost & mask) != (sign && (bfd_signed_vma) result < 0 ? mask : 0))
- status |= 2;
- if ((byte & 0x80) == 0)
- {
- status &= ~1;
- if (sign && shift < CHAR_BIT * sizeof (result) && (byte & 0x40))
- result |= -((bfd_vma) 1 << shift);
- break;
- }
- }
- if (length_return != NULL)
- *length_return = num_read;
- if (error_return != NULL)
- *error_return = status != 0;
- return result;
- }
- /* Encode an integer V as LEB128 and write it to ABFD, return TRUE on
- success. */
- static bool
- wasm_write_uleb128 (bfd *abfd, bfd_vma v)
- {
- do
- {
- bfd_byte c = v & 0x7f;
- v >>= 7;
- if (v)
- c |= 0x80;
- if (bfd_bwrite (&c, 1, abfd) != 1)
- return false;
- }
- while (v);
- return true;
- }
- /* Read the LEB128 integer at P, saving it to X; at end of buffer,
- jump to error_return. */
- #define READ_LEB128(x, p, end) \
- do \
- { \
- if ((p) >= (end)) \
- goto error_return; \
- (x) = _bfd_safe_read_leb128 (abfd, &(p), false, (end)); \
- } \
- while (0)
- /* Verify the magic number at the beginning of a WebAssembly module
- ABFD, setting ERRORPTR if there's a mismatch. */
- static bool
- wasm_read_magic (bfd *abfd, bool *errorptr)
- {
- bfd_byte magic_const[SIZEOF_WASM_MAGIC] = WASM_MAGIC;
- bfd_byte magic[SIZEOF_WASM_MAGIC];
- if (bfd_bread (magic, sizeof (magic), abfd) == sizeof (magic)
- && memcmp (magic, magic_const, sizeof (magic)) == 0)
- return true;
- *errorptr = true;
- return false;
- }
- /* Read the version number from ABFD, returning TRUE if it's a supported
- version. Set ERRORPTR otherwise. */
- static bool
- wasm_read_version (bfd *abfd, bool *errorptr)
- {
- bfd_byte vers_const[SIZEOF_WASM_VERSION] = WASM_VERSION;
- bfd_byte vers[SIZEOF_WASM_VERSION];
- if (bfd_bread (vers, sizeof (vers), abfd) == sizeof (vers)
- /* Don't attempt to parse newer versions, which are likely to
- require code changes. */
- && memcmp (vers, vers_const, sizeof (vers)) == 0)
- return true;
- *errorptr = true;
- return false;
- }
- /* Read the WebAssembly header (magic number plus version number) from
- ABFD, setting ERRORPTR to TRUE if there is a mismatch. */
- static bool
- wasm_read_header (bfd *abfd, bool *errorptr)
- {
- if (! wasm_read_magic (abfd, errorptr))
- return false;
- if (! wasm_read_version (abfd, errorptr))
- return false;
- return true;
- }
- /* Scan the "function" subsection of the "name" section ASECT in the
- wasm module ABFD. Create symbols. Return TRUE on success. */
- static bool
- wasm_scan_name_function_section (bfd *abfd, sec_ptr asect)
- {
- bfd_byte *p;
- bfd_byte *end;
- bfd_vma payload_size;
- bfd_vma symcount = 0;
- tdata_type *tdata = abfd->tdata.any;
- asymbol *symbols = NULL;
- sec_ptr space_function_index;
- size_t amt;
- p = asect->contents;
- end = asect->contents + asect->size;
- if (!p)
- return false;
- while (p < end)
- {
- bfd_byte subsection_code = *p++;
- if (subsection_code == WASM_FUNCTION_SUBSECTION)
- break;
- /* subsection_code is documented to be a varuint7, meaning that
- it has to be a single byte in the 0 - 127 range. If it isn't,
- the spec must have changed underneath us, so give up. */
- if (subsection_code & 0x80)
- return false;
- READ_LEB128 (payload_size, p, end);
- if (payload_size > (size_t) (end - p))
- return false;
- p += payload_size;
- }
- if (p >= end)
- return false;
- READ_LEB128 (payload_size, p, end);
- if (payload_size > (size_t) (end - p))
- return false;
- end = p + payload_size;
- READ_LEB128 (symcount, p, end);
- /* Sanity check: each symbol has at least two bytes. */
- if (symcount > payload_size / 2)
- return false;
- tdata->symcount = symcount;
- space_function_index
- = bfd_make_section_with_flags (abfd, WASM_SECTION_FUNCTION_INDEX,
- SEC_READONLY | SEC_CODE);
- if (!space_function_index)
- space_function_index
- = bfd_get_section_by_name (abfd, WASM_SECTION_FUNCTION_INDEX);
- if (!space_function_index)
- return false;
- if (_bfd_mul_overflow (tdata->symcount, sizeof (asymbol), &amt))
- {
- bfd_set_error (bfd_error_file_too_big);
- return false;
- }
- symbols = bfd_alloc (abfd, amt);
- if (!symbols)
- return false;
- for (symcount = 0; p < end && symcount < tdata->symcount; symcount++)
- {
- bfd_vma idx;
- bfd_vma len;
- char *name;
- asymbol *sym;
- READ_LEB128 (idx, p, end);
- READ_LEB128 (len, p, end);
- if (len > (size_t) (end - p))
- goto error_return;
- name = bfd_alloc (abfd, len + 1);
- if (!name)
- goto error_return;
- memcpy (name, p, len);
- name[len] = 0;
- p += len;
- sym = &symbols[symcount];
- sym->the_bfd = abfd;
- sym->name = name;
- sym->value = idx;
- sym->flags = BSF_GLOBAL | BSF_FUNCTION;
- sym->section = space_function_index;
- sym->udata.p = NULL;
- }
- if (symcount < tdata->symcount)
- goto error_return;
- tdata->symbols = symbols;
- abfd->symcount = symcount;
- return true;
- error_return:
- if (symbols)
- bfd_release (abfd, symbols);
- return false;
- }
- /* Read a byte from ABFD and return it, or EOF for EOF or error.
- Set ERRORPTR on non-EOF error. */
- static int
- wasm_read_byte (bfd *abfd, bool *errorptr)
- {
- bfd_byte byte;
- if (bfd_bread (&byte, (bfd_size_type) 1, abfd) != 1)
- {
- if (bfd_get_error () != bfd_error_file_truncated)
- *errorptr = true;
- return EOF;
- }
- return byte;
- }
- /* Scan the wasm module ABFD, creating sections and symbols.
- Return TRUE on success. */
- static bool
- wasm_scan (bfd *abfd)
- {
- bool error = false;
- /* Fake VMAs for now. Choose 0x80000000 as base to avoid clashes
- with actual data addresses. */
- bfd_vma vma = 0x80000000;
- int section_code;
- unsigned int bytes_read;
- asection *bfdsec;
- if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
- goto error_return;
- if (!wasm_read_header (abfd, &error))
- goto error_return;
- while ((section_code = wasm_read_byte (abfd, &error)) != EOF)
- {
- if (section_code != 0)
- {
- const char *sname = wasm_section_code_to_name (section_code);
- if (!sname)
- goto error_return;
- bfdsec = bfd_make_section_anyway_with_flags (abfd, sname,
- SEC_HAS_CONTENTS);
- if (bfdsec == NULL)
- goto error_return;
- bfdsec->size = wasm_read_leb128 (abfd, &error, &bytes_read, false);
- if (error)
- goto error_return;
- }
- else
- {
- bfd_vma payload_len;
- bfd_vma namelen;
- char *name;
- char *prefix = WASM_SECTION_PREFIX;
- size_t prefixlen = strlen (prefix);
- ufile_ptr filesize;
- payload_len = wasm_read_leb128 (abfd, &error, &bytes_read, false);
- if (error)
- goto error_return;
- namelen = wasm_read_leb128 (abfd, &error, &bytes_read, false);
- if (error || bytes_read > payload_len
- || namelen > payload_len - bytes_read)
- goto error_return;
- payload_len -= namelen + bytes_read;
- filesize = bfd_get_file_size (abfd);
- if (filesize != 0 && namelen > filesize)
- {
- bfd_set_error (bfd_error_file_truncated);
- return false;
- }
- name = bfd_alloc (abfd, namelen + prefixlen + 1);
- if (!name)
- goto error_return;
- memcpy (name, prefix, prefixlen);
- if (bfd_bread (name + prefixlen, namelen, abfd) != namelen)
- goto error_return;
- name[prefixlen + namelen] = 0;
- bfdsec = bfd_make_section_anyway_with_flags (abfd, name,
- SEC_HAS_CONTENTS);
- if (bfdsec == NULL)
- goto error_return;
- bfdsec->size = payload_len;
- }
- bfdsec->vma = vma;
- bfdsec->lma = vma;
- bfdsec->alignment_power = 0;
- bfdsec->filepos = bfd_tell (abfd);
- if (bfdsec->size != 0)
- {
- bfdsec->contents = _bfd_alloc_and_read (abfd, bfdsec->size,
- bfdsec->size);
- if (!bfdsec->contents)
- goto error_return;
- }
- vma += bfdsec->size;
- }
- /* Make sure we're at actual EOF. There's no indication in the
- WebAssembly format of how long the file is supposed to be. */
- if (error)
- goto error_return;
- return true;
- error_return:
- return false;
- }
- /* Put a numbered section ASECT of ABFD into the table of numbered
- sections pointed to by FSARG. */
- static void
- wasm_register_section (bfd *abfd ATTRIBUTE_UNUSED,
- asection *asect,
- void *fsarg)
- {
- sec_ptr *numbered_sections = fsarg;
- int idx = wasm_section_name_to_code (asect->name);
- if (idx == 0)
- return;
- numbered_sections[idx] = asect;
- }
- struct compute_section_arg
- {
- bfd_vma pos;
- bool failed;
- };
- /* Compute the file position of ABFD's section ASECT. FSARG is a
- pointer to the current file position.
- We allow section names of the form .wasm.id to encode the numbered
- section with ID id, if it exists; otherwise, a custom section with
- ID "id" is produced. Arbitrary section names are for sections that
- are assumed already to contain a section header; those are appended
- to the WebAssembly module verbatim. */
- static void
- wasm_compute_custom_section_file_position (bfd *abfd,
- sec_ptr asect,
- void *fsarg)
- {
- struct compute_section_arg *fs = fsarg;
- int idx;
- if (fs->failed)
- return;
- idx = wasm_section_name_to_code (asect->name);
- if (idx != 0)
- return;
- if (startswith (asect->name, WASM_SECTION_PREFIX))
- {
- const char *name = asect->name + strlen (WASM_SECTION_PREFIX);
- bfd_size_type payload_len = asect->size;
- bfd_size_type name_len = strlen (name);
- bfd_size_type nl = name_len;
- payload_len += name_len;
- do
- {
- payload_len++;
- nl >>= 7;
- }
- while (nl);
- bfd_seek (abfd, fs->pos, SEEK_SET);
- if (! wasm_write_uleb128 (abfd, 0)
- || ! wasm_write_uleb128 (abfd, payload_len)
- || ! wasm_write_uleb128 (abfd, name_len)
- || bfd_bwrite (name, name_len, abfd) != name_len)
- goto error_return;
- fs->pos = asect->filepos = bfd_tell (abfd);
- }
- else
- {
- asect->filepos = fs->pos;
- }
- fs->pos += asect->size;
- return;
- error_return:
- fs->failed = true;
- }
- /* Compute the file positions for the sections of ABFD. Currently,
- this writes all numbered sections first, in order, then all custom
- sections, in section order.
- The spec says that the numbered sections must appear in order of
- their ids, but custom sections can appear in any position and any
- order, and more than once. FIXME: support that. */
- static bool
- wasm_compute_section_file_positions (bfd *abfd)
- {
- bfd_byte magic[SIZEOF_WASM_MAGIC] = WASM_MAGIC;
- bfd_byte vers[SIZEOF_WASM_VERSION] = WASM_VERSION;
- sec_ptr numbered_sections[WASM_NUMBERED_SECTIONS];
- struct compute_section_arg fs;
- unsigned int i;
- bfd_seek (abfd, (bfd_vma) 0, SEEK_SET);
- if (bfd_bwrite (magic, sizeof (magic), abfd) != (sizeof magic)
- || bfd_bwrite (vers, sizeof (vers), abfd) != sizeof (vers))
- return false;
- for (i = 0; i < WASM_NUMBERED_SECTIONS; i++)
- numbered_sections[i] = NULL;
- bfd_map_over_sections (abfd, wasm_register_section, numbered_sections);
- fs.pos = bfd_tell (abfd);
- for (i = 0; i < WASM_NUMBERED_SECTIONS; i++)
- {
- sec_ptr sec = numbered_sections[i];
- bfd_size_type size;
- if (! sec)
- continue;
- size = sec->size;
- if (bfd_seek (abfd, fs.pos, SEEK_SET) != 0)
- return false;
- if (! wasm_write_uleb128 (abfd, i)
- || ! wasm_write_uleb128 (abfd, size))
- return false;
- fs.pos = sec->filepos = bfd_tell (abfd);
- fs.pos += size;
- }
- fs.failed = false;
- bfd_map_over_sections (abfd, wasm_compute_custom_section_file_position, &fs);
- if (fs.failed)
- return false;
- abfd->output_has_begun = true;
- return true;
- }
- static bool
- wasm_set_section_contents (bfd *abfd,
- sec_ptr section,
- const void *location,
- file_ptr offset,
- bfd_size_type count)
- {
- if (count == 0)
- return true;
- if (! abfd->output_has_begun
- && ! wasm_compute_section_file_positions (abfd))
- return false;
- if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0
- || bfd_bwrite (location, count, abfd) != count)
- return false;
- return true;
- }
- static bool
- wasm_write_object_contents (bfd* abfd)
- {
- bfd_byte magic[] = WASM_MAGIC;
- bfd_byte vers[] = WASM_VERSION;
- if (bfd_seek (abfd, 0, SEEK_SET) != 0)
- return false;
- if (bfd_bwrite (magic, sizeof (magic), abfd) != sizeof (magic)
- || bfd_bwrite (vers, sizeof (vers), abfd) != sizeof (vers))
- return false;
- return true;
- }
- static bool
- wasm_mkobject (bfd *abfd)
- {
- tdata_type *tdata = (tdata_type *) bfd_alloc (abfd, sizeof (tdata_type));
- if (! tdata)
- return false;
- tdata->symbols = NULL;
- tdata->symcount = 0;
- abfd->tdata.any = tdata;
- return true;
- }
- static long
- wasm_get_symtab_upper_bound (bfd *abfd)
- {
- tdata_type *tdata = abfd->tdata.any;
- return (tdata->symcount + 1) * (sizeof (asymbol *));
- }
- static long
- wasm_canonicalize_symtab (bfd *abfd, asymbol **alocation)
- {
- tdata_type *tdata = abfd->tdata.any;
- size_t i;
- for (i = 0; i < tdata->symcount; i++)
- alocation[i] = &tdata->symbols[i];
- alocation[i] = NULL;
- return tdata->symcount;
- }
- static asymbol *
- wasm_make_empty_symbol (bfd *abfd)
- {
- size_t amt = sizeof (asymbol);
- asymbol *new_symbol = (asymbol *) bfd_zalloc (abfd, amt);
- if (! new_symbol)
- return NULL;
- new_symbol->the_bfd = abfd;
- return new_symbol;
- }
- static void
- wasm_print_symbol (bfd *abfd,
- void * filep,
- asymbol *symbol,
- bfd_print_symbol_type how)
- {
- FILE *file = (FILE *) filep;
- switch (how)
- {
- case bfd_print_symbol_name:
- fprintf (file, "%s", symbol->name);
- break;
- default:
- bfd_print_symbol_vandf (abfd, filep, symbol);
- fprintf (file, " %-5s %s", symbol->section->name, symbol->name);
- }
- }
- static void
- wasm_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED,
- asymbol *symbol,
- symbol_info *ret)
- {
- bfd_symbol_info (symbol, ret);
- }
- /* Check whether ABFD is a WebAssembly module; if so, scan it. */
- static bfd_cleanup
- wasm_object_p (bfd *abfd)
- {
- bool error;
- asection *s;
- if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
- return NULL;
- if (!wasm_read_header (abfd, &error))
- {
- bfd_set_error (bfd_error_wrong_format);
- return NULL;
- }
- if (!wasm_mkobject (abfd))
- return NULL;
- if (!wasm_scan (abfd)
- || !bfd_default_set_arch_mach (abfd, bfd_arch_wasm32, 0))
- {
- bfd_release (abfd, abfd->tdata.any);
- abfd->tdata.any = NULL;
- return NULL;
- }
- s = bfd_get_section_by_name (abfd, WASM_NAME_SECTION);
- if (s != NULL && wasm_scan_name_function_section (abfd, s))
- abfd->flags |= HAS_SYMS;
- return _bfd_no_cleanup;
- }
- /* BFD_JUMP_TABLE_WRITE */
- #define wasm_set_arch_mach _bfd_generic_set_arch_mach
- /* BFD_JUMP_TABLE_SYMBOLS */
- #define wasm_get_symbol_version_string _bfd_nosymbols_get_symbol_version_string
- #define wasm_bfd_is_local_label_name bfd_generic_is_local_label_name
- #define wasm_bfd_is_target_special_symbol _bfd_bool_bfd_asymbol_false
- #define wasm_get_lineno _bfd_nosymbols_get_lineno
- #define wasm_find_nearest_line _bfd_nosymbols_find_nearest_line
- #define wasm_find_line _bfd_nosymbols_find_line
- #define wasm_find_inliner_info _bfd_nosymbols_find_inliner_info
- #define wasm_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
- #define wasm_read_minisymbols _bfd_generic_read_minisymbols
- #define wasm_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
- const bfd_target wasm_vec =
- {
- "wasm", /* Name. */
- bfd_target_unknown_flavour,
- BFD_ENDIAN_LITTLE,
- BFD_ENDIAN_LITTLE,
- (HAS_SYMS | WP_TEXT), /* Object flags. */
- (SEC_CODE | SEC_DATA | SEC_HAS_CONTENTS), /* Section flags. */
- 0, /* Leading underscore. */
- ' ', /* AR_pad_char. */
- 255, /* AR_max_namelen. */
- 0, /* Match priority. */
- TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
- /* Routines to byte-swap various sized integers from the data sections. */
- bfd_getl64, bfd_getl_signed_64, bfd_putl64,
- bfd_getl32, bfd_getl_signed_32, bfd_putl32,
- bfd_getl16, bfd_getl_signed_16, bfd_putl16,
- /* Routines to byte-swap various sized integers from the file headers. */
- bfd_getl64, bfd_getl_signed_64, bfd_putl64,
- bfd_getl32, bfd_getl_signed_32, bfd_putl32,
- bfd_getl16, bfd_getl_signed_16, bfd_putl16,
- {
- _bfd_dummy_target,
- wasm_object_p, /* bfd_check_format. */
- _bfd_dummy_target,
- _bfd_dummy_target,
- },
- {
- _bfd_bool_bfd_false_error,
- wasm_mkobject,
- _bfd_generic_mkarchive,
- _bfd_bool_bfd_false_error,
- },
- { /* bfd_write_contents. */
- _bfd_bool_bfd_false_error,
- wasm_write_object_contents,
- _bfd_write_archive_contents,
- _bfd_bool_bfd_false_error,
- },
- BFD_JUMP_TABLE_GENERIC (_bfd_generic),
- BFD_JUMP_TABLE_COPY (_bfd_generic),
- BFD_JUMP_TABLE_CORE (_bfd_nocore),
- BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
- BFD_JUMP_TABLE_SYMBOLS (wasm),
- BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
- BFD_JUMP_TABLE_WRITE (wasm),
- BFD_JUMP_TABLE_LINK (_bfd_nolink),
- BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
- NULL,
- NULL,
- };
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