/* Special section index values. */
+#define SHN_UNDEF 0 /* Undefined section */
#define SHN_LORESERVE 0xFF00 /* Begin range of reserved indices */
+#define SHN_COMMON 0xFFF2 /* Associated symbol is in common */
#define SHN_XINDEX 0xFFFF /* Section index is held elsewhere */
+
/* 32-bit ELF program header. */
typedef struct {
/* Values for sh_type field. */
+#define SHT_NULL 0 /* Section header table entry unused */
#define SHT_PROGBITS 1 /* Program data */
+#define SHT_SYMTAB 2 /* Link editing symbol table */
#define SHT_STRTAB 3 /* A string table */
+#define SHT_RELA 4 /* Relocation entries with addends */
+#define SHT_REL 9 /* Relocation entries, no addends */
+#define SHT_GROUP 17 /* Section contains a section group */
+
+/* Values for sh_flags field. */
+
+#define SHF_EXCLUDE 0x80000000 /* Link editor is to exclude this
+ section from executable and
+ shared library that it builds
+ when those objects are not to be
+ further relocated. */
+/* Symbol table entry. */
+
+typedef struct
+{
+ unsigned char st_name[4]; /* Symbol name (string tbl index) */
+ unsigned char st_value[4]; /* Symbol value */
+ unsigned char st_size[4]; /* Symbol size */
+ unsigned char st_info; /* Symbol type and binding */
+ unsigned char st_other; /* Symbol visibility */
+ unsigned char st_shndx[2]; /* Section index */
+} Elf32_External_Sym;
+
+typedef struct
+{
+ unsigned char st_name[4]; /* Symbol name (string tbl index) */
+ unsigned char st_info; /* Symbol type and binding */
+ unsigned char st_other; /* Symbol visibility */
+ unsigned char st_shndx[2]; /* Section index */
+ unsigned char st_value[8]; /* Symbol value */
+ unsigned char st_size[8]; /* Symbol size */
+} Elf64_External_Sym;
+
+#define ELF_ST_BIND(val) (((unsigned char) (val)) >> 4)
+#define ELF_ST_TYPE(val) ((val) & 0xf)
+#define ELF_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
+
+#define STT_NOTYPE 0 /* Symbol type is unspecified */
+#define STT_OBJECT 1 /* Symbol is a data object */
+#define STT_FUNC 2 /* Symbol is a code object */
+#define STT_TLS 6 /* Thread local data object */
+#define STT_GNU_IFUNC 10 /* Symbol is an indirect code object */
+
+#define STB_LOCAL 0 /* Local symbol */
+#define STB_GLOBAL 1 /* Global symbol */
+
+#define STV_DEFAULT 0 /* Visibility is specified by binding type */
/* Functions to fetch and store different ELF types, depending on the
endianness and size. */
unsigned int flags;
};
+/* Private data for an simple_object_write. */
+
+struct simple_object_elf_write
+{
+ struct simple_object_elf_attributes attrs;
+ unsigned char *shdrs;
+};
+
/* See if we have an ELF file. */
static void *
/* Read the section names. */
+ if (eor->shstrndx == 0)
+ {
+ XDELETEVEC (shdrs);
+ return "ELF section header string table missing";
+ }
shstrhdr = shdrs + (eor->shstrndx - 1) * shdr_size;
name_size = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
shstrhdr, sh_size, Elf_Addr);
{
struct simple_object_elf_attributes *attrs =
(struct simple_object_elf_attributes *) attributes_data;
- struct simple_object_elf_attributes *ret;
+ struct simple_object_elf_write *ret;
/* We're just going to record the attributes, but we need to make a
copy because the user may delete them. */
- ret = XNEW (struct simple_object_elf_attributes);
- *ret = *attrs;
+ ret = XNEW (struct simple_object_elf_write);
+ ret->attrs = *attrs;
+ ret->shdrs = NULL;
return ret;
}
simple_object_elf_write_shdr (simple_object_write *sobj, int descriptor,
off_t offset, unsigned int sh_name,
unsigned int sh_type, unsigned int sh_flags,
+ off_t sh_addr,
unsigned int sh_offset, unsigned int sh_size,
- unsigned int sh_link, unsigned int sh_addralign,
+ unsigned int sh_link, unsigned int sh_info,
+ size_t sh_addralign,
+ size_t sh_entsize,
const char **errmsg, int *err)
{
struct simple_object_elf_attributes *attrs =
ELF_SET_FIELD (fns, cl, Shdr, buf, sh_name, Elf_Word, sh_name);
ELF_SET_FIELD (fns, cl, Shdr, buf, sh_type, Elf_Word, sh_type);
ELF_SET_FIELD (fns, cl, Shdr, buf, sh_flags, Elf_Addr, sh_flags);
+ ELF_SET_FIELD (fns, cl, Shdr, buf, sh_addr, Elf_Addr, sh_addr);
ELF_SET_FIELD (fns, cl, Shdr, buf, sh_offset, Elf_Addr, sh_offset);
ELF_SET_FIELD (fns, cl, Shdr, buf, sh_size, Elf_Addr, sh_size);
ELF_SET_FIELD (fns, cl, Shdr, buf, sh_link, Elf_Word, sh_link);
- /* sh_info left as zero. */
+ ELF_SET_FIELD (fns, cl, Shdr, buf, sh_info, Elf_Word, sh_info);
ELF_SET_FIELD (fns, cl, Shdr, buf, sh_addralign, Elf_Addr, sh_addralign);
- /* sh_entsize left as zero. */
+ ELF_SET_FIELD (fns, cl, Shdr, buf, sh_entsize, Elf_Addr, sh_entsize);
return simple_object_internal_write (descriptor, offset, buf, shdr_size,
errmsg, err);
simple_object_elf_write_to_file (simple_object_write *sobj, int descriptor,
int *err)
{
- struct simple_object_elf_attributes *attrs =
- (struct simple_object_elf_attributes *) sobj->data;
+ struct simple_object_elf_write *eow =
+ (struct simple_object_elf_write *) sobj->data;
+ struct simple_object_elf_attributes *attrs = &eow->attrs;
unsigned char cl;
size_t ehdr_size;
size_t shdr_size;
unsigned int first_sh_link;
size_t sh_name;
unsigned char zero;
+ unsigned secnum;
if (!simple_object_elf_write_ehdr (sobj, descriptor, &errmsg, err))
return errmsg;
else
first_sh_link = shnum - 1;
if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset,
- 0, 0, 0, 0, first_sh_size, first_sh_link,
- 0, &errmsg, err))
+ 0, 0, 0, 0, 0, first_sh_size, first_sh_link,
+ 0, 0, 0, &errmsg, err))
return errmsg;
shdr_offset += shdr_size;
sh_name = 1;
+ secnum = 0;
for (section = sobj->sections; section != NULL; section = section->next)
{
size_t mask;
size_t new_sh_offset;
size_t sh_size;
struct simple_object_write_section_buffer *buffer;
+ unsigned int sh_type = SHT_PROGBITS;
+ unsigned int sh_flags = 0;
+ off_t sh_addr = 0;
+ unsigned int sh_link = 0;
+ unsigned int sh_info = 0;
+ size_t sh_addralign = 1U << section->align;
+ size_t sh_entsize = 0;
+ if (eow->shdrs)
+ {
+ sh_type = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr,
+ eow->shdrs + secnum * shdr_size,
+ sh_type, Elf_Word);
+ sh_flags = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr,
+ eow->shdrs + secnum * shdr_size,
+ sh_flags, Elf_Addr);
+ sh_addr = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr,
+ eow->shdrs + secnum * shdr_size,
+ sh_addr, Elf_Addr);
+ sh_link = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr,
+ eow->shdrs + secnum * shdr_size,
+ sh_link, Elf_Word);
+ sh_info = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr,
+ eow->shdrs + secnum * shdr_size,
+ sh_info, Elf_Word);
+ sh_addralign = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr,
+ eow->shdrs + secnum * shdr_size,
+ sh_addralign, Elf_Addr);
+ sh_entsize = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr,
+ eow->shdrs + secnum * shdr_size,
+ sh_entsize, Elf_Addr);
+ secnum++;
+ }
- mask = (1U << section->align) - 1;
+ mask = sh_addralign - 1;
new_sh_offset = sh_offset + mask;
new_sh_offset &= ~ mask;
while (new_sh_offset > sh_offset)
}
if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset,
- sh_name, SHT_PROGBITS, 0, sh_offset,
- sh_size, 0, 1U << section->align,
+ sh_name, sh_type, sh_flags,
+ sh_addr, sh_offset,
+ sh_size, sh_link, sh_info,
+ sh_addralign, sh_entsize,
&errmsg, err))
return errmsg;
}
if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset,
- sh_name, SHT_STRTAB, 0, sh_offset,
- sh_name + strlen (".shstrtab") + 1, 0,
- 1, &errmsg, err))
+ sh_name, SHT_STRTAB, 0, 0, sh_offset,
+ sh_name + strlen (".shstrtab") + 1, 0, 0,
+ 1, 0, &errmsg, err))
return errmsg;
/* .shstrtab has a leading zero byte. */
static void
simple_object_elf_release_write (void *data)
{
+ struct simple_object_elf_write *eow = (struct simple_object_elf_write *) data;
+ if (eow->shdrs)
+ XDELETE (eow->shdrs);
XDELETE (data);
}
+/* Copy all sections in an ELF file. */
+
+static const char *
+simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
+ simple_object_write *dobj,
+ int (*pfn) (const char **),
+ int *err)
+{
+ struct simple_object_elf_read *eor =
+ (struct simple_object_elf_read *) sobj->data;
+ const struct elf_type_functions *type_functions = eor->type_functions;
+ struct simple_object_elf_write *eow =
+ (struct simple_object_elf_write *) dobj->data;
+ unsigned char ei_class = eor->ei_class;
+ size_t shdr_size;
+ unsigned int shnum;
+ unsigned char *shdrs;
+ const char *errmsg;
+ unsigned char *shstrhdr;
+ size_t name_size;
+ off_t shstroff;
+ unsigned char *names;
+ unsigned int i;
+ int *pfnret;
+ const char **pfnname;
+
+ shdr_size = (ei_class == ELFCLASS32
+ ? sizeof (Elf32_External_Shdr)
+ : sizeof (Elf64_External_Shdr));
+
+ /* Read the section headers. We skip section 0, which is not a
+ useful section. */
+
+ shnum = eor->shnum;
+ shdrs = XNEWVEC (unsigned char, shdr_size * (shnum - 1));
+
+ if (!simple_object_internal_read (sobj->descriptor,
+ sobj->offset + eor->shoff + shdr_size,
+ shdrs,
+ shdr_size * (shnum - 1),
+ &errmsg, err))
+ {
+ XDELETEVEC (shdrs);
+ return errmsg;
+ }
+
+ /* Read the section names. */
+
+ shstrhdr = shdrs + (eor->shstrndx - 1) * shdr_size;
+ name_size = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shstrhdr, sh_size, Elf_Addr);
+ shstroff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shstrhdr, sh_offset, Elf_Addr);
+ names = XNEWVEC (unsigned char, name_size);
+ if (!simple_object_internal_read (sobj->descriptor,
+ sobj->offset + shstroff,
+ names, name_size, &errmsg, err))
+ {
+ XDELETEVEC (names);
+ XDELETEVEC (shdrs);
+ return errmsg;
+ }
+
+ eow->shdrs = XNEWVEC (unsigned char, shdr_size * (shnum - 1));
+ pfnret = XNEWVEC (int, shnum);
+ pfnname = XNEWVEC (const char *, shnum);
+
+ /* First perform the callbacks to know which sections to preserve and
+ what name to use for those. */
+ for (i = 1; i < shnum; ++i)
+ {
+ unsigned char *shdr;
+ unsigned int sh_name;
+ const char *name;
+ int ret;
+
+ shdr = shdrs + (i - 1) * shdr_size;
+ sh_name = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_name, Elf_Word);
+ if (sh_name >= name_size)
+ {
+ *err = 0;
+ XDELETEVEC (names);
+ XDELETEVEC (shdrs);
+ return "ELF section name out of range";
+ }
+
+ name = (const char *) names + sh_name;
+
+ ret = (*pfn) (&name);
+ pfnret[i - 1] = ret == 1 ? 0 : -1;
+ pfnname[i - 1] = name;
+ }
+
+ /* Mark sections as preserved that are required by to be preserved
+ sections. */
+ for (i = 1; i < shnum; ++i)
+ {
+ unsigned char *shdr;
+ unsigned int sh_type, sh_info, sh_link;
+ off_t offset;
+ off_t length;
+
+ shdr = shdrs + (i - 1) * shdr_size;
+ sh_type = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_type, Elf_Word);
+ sh_info = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_info, Elf_Word);
+ sh_link = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_link, Elf_Word);
+ if (sh_type == SHT_GROUP)
+ {
+ /* Mark groups containing copied sections. */
+ unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_entsize, Elf_Addr);
+ unsigned char *ent, *buf;
+ int keep = 0;
+ offset = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_offset, Elf_Addr);
+ length = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_size, Elf_Addr);
+ buf = XNEWVEC (unsigned char, length);
+ if (!simple_object_internal_read (sobj->descriptor,
+ sobj->offset + offset, buf,
+ (size_t) length, &errmsg, err))
+ {
+ XDELETEVEC (buf);
+ XDELETEVEC (names);
+ XDELETEVEC (shdrs);
+ return errmsg;
+ }
+ for (ent = buf + entsize; ent < buf + length; ent += entsize)
+ {
+ unsigned sec = type_functions->fetch_Elf_Word (ent);
+ if (pfnret[sec - 1] == 0)
+ keep = 1;
+ }
+ if (keep)
+ {
+ pfnret[sh_link - 1] = 0;
+ pfnret[i - 1] = 0;
+ }
+ }
+ if (sh_type == SHT_RELA
+ || sh_type == SHT_REL)
+ {
+ /* Mark relocation sections and symtab of copied sections. */
+ if (pfnret[sh_info - 1] == 0)
+ {
+ pfnret[sh_link - 1] = 0;
+ pfnret[i - 1] = 0;
+ }
+ }
+ if (sh_type == SHT_SYMTAB)
+ {
+ /* Mark strings sections of copied symtabs. */
+ if (pfnret[i - 1] == 0)
+ pfnret[sh_link - 1] = 0;
+ }
+ }
+
+ /* Then perform the actual copying. */
+ for (i = 1; i < shnum; ++i)
+ {
+ unsigned char *shdr;
+ unsigned int sh_name, sh_type;
+ const char *name;
+ off_t offset;
+ off_t length;
+ int ret;
+ const char *errmsg;
+ simple_object_write_section *dest;
+ off_t flags;
+ unsigned char *buf;
+
+ shdr = shdrs + (i - 1) * shdr_size;
+ sh_name = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_name, Elf_Word);
+ if (sh_name >= name_size)
+ {
+ *err = 0;
+ XDELETEVEC (names);
+ XDELETEVEC (shdrs);
+ return "ELF section name out of range";
+ }
+
+ name = (const char *) names + sh_name;
+ offset = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_offset, Elf_Addr);
+ length = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_size, Elf_Addr);
+ sh_type = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_type, Elf_Word);
+
+ ret = pfnret[i - 1];
+ name = ret == 0 ? pfnname[i - 1] : "";
+
+ dest = simple_object_write_create_section (dobj, name, 0, &errmsg, err);
+ if (dest == NULL)
+ {
+ XDELETEVEC (names);
+ XDELETEVEC (shdrs);
+ return errmsg;
+ }
+
+ /* Record the SHDR of the source. */
+ memcpy (eow->shdrs + (i - 1) * shdr_size, shdr, shdr_size);
+ shdr = eow->shdrs + (i - 1) * shdr_size;
+
+ /* Copy the data.
+ ??? This is quite wasteful and ideally would be delayed until
+ write_to_file (). Thus it questions the interfacing
+ which eventually should contain destination creation plus
+ writing. */
+ /* Keep empty sections for sections we should discard. This avoids
+ the need to rewrite section indices in symtab and relocation
+ sections. */
+ if (ret == 0)
+ {
+ buf = XNEWVEC (unsigned char, length);
+ if (!simple_object_internal_read (sobj->descriptor,
+ sobj->offset + offset, buf,
+ (size_t) length, &errmsg, err))
+ {
+ XDELETEVEC (buf);
+ XDELETEVEC (names);
+ XDELETEVEC (shdrs);
+ return errmsg;
+ }
+
+ /* If we are processing .symtab purge __gnu_lto_v1 and
+ __gnu_lto_slim symbols from it. */
+ if (sh_type == SHT_SYMTAB)
+ {
+ unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_entsize, Elf_Addr);
+ unsigned strtab = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_link, Elf_Word);
+ unsigned char *strshdr = shdrs + (strtab - 1) * shdr_size;
+ off_t stroff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ strshdr, sh_offset, Elf_Addr);
+ size_t strsz = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ strshdr, sh_size, Elf_Addr);
+ char *strings = XNEWVEC (char, strsz);
+ unsigned char *ent;
+ simple_object_internal_read (sobj->descriptor,
+ sobj->offset + stroff,
+ (unsigned char *)strings,
+ strsz, &errmsg, err);
+ for (ent = buf; ent < buf + length; ent += entsize)
+ {
+ unsigned st_shndx = ELF_FETCH_FIELD (type_functions, ei_class,
+ Sym, ent,
+ st_shndx, Elf_Half);
+ unsigned char *st_info;
+ unsigned char *st_other;
+ int discard = 0;
+ if (ei_class == ELFCLASS32)
+ {
+ st_info = &((Elf32_External_Sym *)ent)->st_info;
+ st_other = &((Elf32_External_Sym *)ent)->st_other;
+ }
+ else
+ {
+ st_info = &((Elf64_External_Sym *)ent)->st_info;
+ st_other = &((Elf64_External_Sym *)ent)->st_other;
+ }
+ /* Eliminate all COMMONs - this includes __gnu_lto_v1
+ and __gnu_lto_slim which otherwise cause endless
+ LTO plugin invocation. */
+ if (st_shndx == SHN_COMMON)
+ /* Setting st_name to "" seems to work to purge
+ COMMON symbols (in addition to setting their
+ size to zero). */
+ discard = 1;
+ /* We also need to remove symbols refering to sections
+ we'll eventually remove as with fat LTO objects
+ we otherwise get duplicate symbols at final link
+ (with GNU ld, gold is fine and ignores symbols in
+ sections marked as EXCLUDE). ld/20513 */
+ else if (st_shndx != SHN_UNDEF
+ && st_shndx < shnum
+ && pfnret[st_shndx - 1] == -1)
+ discard = 1;
+
+ if (discard)
+ {
+ /* Make discarded symbols undefined and unnamed
+ in case it is local. */
+ if (ELF_ST_BIND (*st_info) == STB_LOCAL)
+ ELF_SET_FIELD (type_functions, ei_class, Sym,
+ ent, st_name, Elf_Word, 0);
+ ELF_SET_FIELD (type_functions, ei_class, Sym,
+ ent, st_value, Elf_Addr, 0);
+ ELF_SET_FIELD (type_functions, ei_class, Sym,
+ ent, st_size, Elf_Word, 0);
+ ELF_SET_FIELD (type_functions, ei_class, Sym,
+ ent, st_shndx, Elf_Half, SHN_UNDEF);
+ *st_info = ELF_ST_INFO (ELF_ST_BIND (*st_info),
+ STT_NOTYPE);
+ *st_other = STV_DEFAULT;
+ }
+ }
+ XDELETEVEC (strings);
+ }
+
+ errmsg = simple_object_write_add_data (dobj, dest,
+ buf, length, 1, err);
+ XDELETEVEC (buf);
+ if (errmsg)
+ {
+ XDELETEVEC (names);
+ XDELETEVEC (shdrs);
+ return errmsg;
+ }
+ }
+ else
+ {
+ /* For deleted sections mark the section header table entry as
+ unused. That allows the link editor to remove it in a partial
+ link. */
+ ELF_SET_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_type, Elf_Word, SHT_NULL);
+ }
+
+ flags = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_flags, Elf_Addr);
+ if (ret == 0)
+ flags &= ~SHF_EXCLUDE;
+ else if (ret == -1)
+ flags = SHF_EXCLUDE;
+ ELF_SET_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_flags, Elf_Addr, flags);
+ }
+
+ XDELETEVEC (names);
+ XDELETEVEC (shdrs);
+ XDELETEVEC (pfnret);
+ XDELETEVEC (pfnname);
+
+ return NULL;
+}
+
+
/* The ELF functions. */
const struct simple_object_functions simple_object_elf_functions =
simple_object_elf_release_attributes,
simple_object_elf_start_write,
simple_object_elf_write_to_file,
- simple_object_elf_release_write
+ simple_object_elf_release_write,
+ simple_object_elf_copy_lto_debug_sections
};
union {
struct {
union {
- /* The name of the symbol. There is an implicit null character
- after the end of the array. */
- char n_name[N_SYMNMLEN];
- struct {
- /* If n_zeroes is zero, n_offset is the offset the name from
- the start of the string table. */
- unsigned char n_zeroes[4];
- unsigned char n_offset[4];
- } n;
+/* The name of the symbol. There is an implicit null character
+ after the end of the array. */
+ char n_name[N_SYMNMLEN];
+ struct {
+ /* If n_zeroes is zero, n_offset is the offset the name from
+ the start of the string table. */
+ unsigned char n_zeroes[4];
+ unsigned char n_offset[4];
+ } n;
} n;
/* The symbol's value. */
#define IMAGE_SYM_TYPE \
((IMAGE_SYM_DTYPE_NULL << 4) | IMAGE_SYM_TYPE_NULL)
+#define C_EXT (2)
#define C_STAT (3)
#define C_FILE (103)
+#define C_HIDEXT (107)
+
+#define XTY_SD (1) /* section definition */
+
+#define XMC_XO (7) /* extended operation */
/* Private data for an simple_object_read. */
size_t scnhdr_size;
unsigned char *scnbuf;
const char *errmsg;
+ unsigned short (*fetch_16) (const unsigned char *);
unsigned int (*fetch_32) (const unsigned char *);
ulong_type (*fetch_64) (const unsigned char *);
unsigned int nscns;
char *strtab;
size_t strtab_size;
+ struct external_syment *symtab = NULL;
unsigned int i;
scnhdr_size = u64 ? SCNHSZ64 : SCNHSZ32;
return errmsg;
}
+ fetch_16 = simple_object_fetch_big_16;
fetch_32 = simple_object_fetch_big_32;
fetch_64 = simple_object_fetch_big_64;
char namebuf[SCNNMLEN + 1];
char *name;
off_t scnptr;
- unsigned int size;
+ off_t size;
scnhdr = scnbuf + i * scnhdr_size;
scnname = scnhdr + offsetof (struct external_scnhdr, s_name);
break;
}
+ /* Special handling for .go_export csect. */
+ if (ocr->nsyms > 0)
+ {
+ unsigned char *sym;
+ const char *n_name;
+ off_t size, n_value;
+ unsigned int n_numaux, n_offset, n_zeroes;
+ short n_scnum;
+
+ /* Read symbol table. */
+ symtab = XNEWVEC (struct external_syment, ocr->nsyms * SYMESZ);
+ if (!simple_object_internal_read (sobj->descriptor,
+ sobj->offset + ocr->symptr,
+ (unsigned char *) symtab,
+ ocr->nsyms * SYMESZ,
+ &errmsg, err))
+ {
+ XDELETEVEC (symtab);
+ XDELETEVEC (scnbuf);
+ return NULL;
+ }
+
+ /* Search in symbol table if we have a ".go_export" symbol. */
+ for (i = 0; i < ocr->nsyms; i += n_numaux + 1)
+ {
+ sym = (unsigned char *) &symtab[i];
+ n_numaux = symtab[i].n_numaux[0];
+
+ if (symtab[i].n_sclass[0] != C_EXT
+ && symtab[i].n_sclass[0] != C_HIDEXT)
+ continue;
+
+ /* Must have at least one csect auxiliary entry. */
+ if (n_numaux < 1 || i + n_numaux >= ocr->nsyms)
+ continue;
+
+ n_scnum = fetch_16 (sym + offsetof (struct external_syment,
+ n_scnum));
+ if (n_scnum < 1 || (unsigned int) n_scnum > nscns)
+ continue;
+
+ if (u64)
+ {
+ n_value = fetch_64 (sym + offsetof (struct external_syment,
+ u.xcoff64.n_value));
+ n_offset = fetch_32 (sym + offsetof (struct external_syment,
+ u.xcoff64.n_offset));
+ }
+ else
+ {
+ /* ".go_export" is longer than N_SYMNMLEN. */
+ n_zeroes = fetch_32 (sym + offsetof (struct external_syment,
+ u.xcoff32.n.n.n_zeroes));
+ if (n_zeroes != 0)
+ continue;
+
+ n_value = fetch_32 (sym + offsetof (struct external_syment,
+ u.xcoff32.n_value));
+ n_offset = fetch_32 (sym + offsetof (struct external_syment,
+ u.xcoff32.n.n.n_offset));
+ }
+
+ /* The real symbol name is found in the string table. */
+ if (strtab == NULL)
+ {
+ strtab = simple_object_xcoff_read_strtab (sobj,
+ &strtab_size,
+ &errmsg, err);
+ if (strtab == NULL)
+ {
+ XDELETEVEC (symtab);
+ XDELETEVEC (scnbuf);
+ return errmsg;
+ }
+ }
+
+ if (n_offset >= strtab_size)
+ {
+ XDELETEVEC (strtab);
+ XDELETEVEC (symtab);
+ XDELETEVEC (scnbuf);
+ *err = 0;
+ return "symbol string index out of range";
+ }
+ n_name = strtab + n_offset;
+
+ if (!strcmp (n_name, ".go_export"))
+ {
+ union external_auxent *auxent;
+ unsigned char *aux, *scnhdr;
+ off_t scnptr, x_scnlen;
+
+ /* Found .go_export symbol, read its csect auxiliary entry.
+ By convention, it is the last auxiliary entry. */
+ auxent = (union external_auxent *) &symtab[i + n_numaux];
+ aux = (unsigned char *) auxent;
+ if (u64)
+ {
+ if ((auxent->u.xcoff64.x_csect.x_smtyp & 0x7) != XTY_SD
+ || auxent->u.xcoff64.x_csect.x_smclas != XMC_XO)
+ continue;
+
+ x_scnlen = fetch_32 (aux + offsetof (union external_auxent,
+ u.xcoff64.x_csect.x_scnlen_hi));
+ x_scnlen = x_scnlen << 32
+ | fetch_32 (aux + offsetof (union external_auxent,
+ u.xcoff64.x_csect.x_scnlen_lo));
+ }
+ else
+ {
+ if ((auxent->u.xcoff32.x_csect.x_smtyp & 0x7) != XTY_SD
+ || auxent->u.xcoff32.x_csect.x_smclas != XMC_XO)
+ continue;
+
+ x_scnlen = fetch_32 (aux + offsetof (union external_auxent,
+ u.xcoff32.x_csect.x_scnlen));
+ }
+
+ /* Get header of containing section. */
+ scnhdr = scnbuf + (n_scnum - 1) * scnhdr_size;
+ if (u64)
+ {
+ scnptr = fetch_64 (scnhdr + offsetof (struct external_scnhdr,
+ u.xcoff64.s_scnptr));
+ size = fetch_64 (scnhdr + offsetof (struct external_scnhdr,
+ u.xcoff64.s_size));
+ }
+ else
+ {
+ scnptr = fetch_32 (scnhdr + offsetof (struct external_scnhdr,
+ u.xcoff32.s_scnptr));
+ size = fetch_32 (scnhdr + offsetof (struct external_scnhdr,
+ u.xcoff32.s_size));
+ }
+ if (n_value + x_scnlen > size)
+ break;
+
+ (*pfn) (data, ".go_export", scnptr + n_value, x_scnlen);
+ break;
+ }
+ }
+ }
+
+ if (symtab != NULL)
+ XDELETEVEC (symtab);
if (strtab != NULL)
XDELETEVEC (strtab);
XDELETEVEC (scnbuf);
simple_object_xcoff_release_attributes,
simple_object_xcoff_start_write,
simple_object_xcoff_write_to_file,
- simple_object_xcoff_release_write
+ simple_object_xcoff_release_write,
+ NULL
};
projects / deliverable / binutils-gdb.git / commitdiff
