/* simple-object-elf.c -- routines to manipulate ELF object files.
- Copyright (C) 2010-2017 Free Software Foundation, Inc.
+ Copyright (C) 2010-2020 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Google.
This program is free software; you can redistribute it and/or modify it
#include "simple-object.h"
#include <errno.h>
+/* mingw.org's MinGW doesn't have ENOTSUP. */
+#ifndef ENOTSUP
+# define ENOTSUP ENOSYS
+#endif
#include <stddef.h>
#ifdef HAVE_STDLIB_H
/* 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 */
+#define SHN_HIRESERVE 0xffff /* End of reserved indices */
+
/* 32-bit ELF program header. */
/* 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 */
+#define SHT_SYMTAB_SHNDX 18 /* Extended section indeces */
+
+/* Values for sh_flags field. */
+
+#define SHF_INFO_LINK 0x00000040 /* `sh_info' contains SHT index */
+#define SHF_EXECINSTR 0x00000004 /* Executable section. */
+#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 STB_WEAK 2 /* Weak global */
+
+#define STV_DEFAULT 0 /* Visibility is specified by binding type */
+#define STV_HIDDEN 2 /* Can only be seen inside currect component */
/* 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 *
XDELETE (eor);
return NULL;
}
-
+
+ if (eor->shstrndx == 0)
+ {
+ *errmsg = "invalid ELF shstrndx == 0";
+ *err = 0;
+ XDELETE (eor);
+ return NULL;
+ }
+
return (void *) eor;
}
{
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,
+ char *(*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 changed;
+ int *pfnret;
+ const char **pfnname;
+ unsigned new_i;
+ unsigned *sh_map;
+ unsigned first_shndx = 0;
+ unsigned int *symtab_indices_shndx;
+
+ 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;
+ }
+
+ pfnret = XNEWVEC (int, shnum);
+ pfnname = XNEWVEC (const char *, shnum);
+
+ /* Map of symtab to index section. */
+ symtab_indices_shndx = XCNEWVEC (unsigned int, shnum - 1);
+
+ /* 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, sh_type;
+ const char *name;
+ char *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 == NULL ? -1 : 0;
+ pfnname[i - 1] = ret == NULL ? name : ret;
+ if (first_shndx == 0
+ && pfnret[i - 1] == 0)
+ first_shndx = i;
+
+ /* Remember the indexes of existing SHT_SYMTAB_SHNDX sections. */
+ sh_type = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_type, Elf_Word);
+ if (sh_type == SHT_SYMTAB_SHNDX)
+ {
+ unsigned int sh_link;
+ sh_link = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_link, Elf_Word);
+ symtab_indices_shndx[sh_link - 1] = i;
+ /* Always discard the extended index sections, after
+ copying it will not be needed. This way we don't need to
+ update it and deal with the ordering constraints of
+ processing the existing symtab and changing the index. */
+ pfnret[i - 1] = -1;
+ }
+ }
+
+ /* Mark sections as preserved that are required by to be preserved
+ sections. */
+ do
+ {
+ changed = 0;
+ 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)
+ {
+ changed |= (pfnret[sh_link - 1] == -1
+ || pfnret[i - 1] == -1);
+ 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)
+ {
+ changed |= (pfnret[sh_link - 1] == -1
+ || pfnret[i - 1] == -1);
+ 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)
+ {
+ changed |= pfnret[sh_link - 1] == -1;
+ pfnret[sh_link - 1] = 0;
+ }
+ }
+ }
+ }
+ while (changed);
+
+ /* Compute a mapping of old -> new section numbers. */
+ sh_map = XNEWVEC (unsigned, shnum);
+ sh_map[0] = 0;
+ new_i = 1;
+ for (i = 1; i < shnum; ++i)
+ {
+ if (pfnret[i - 1] == -1)
+ sh_map[i] = 0;
+ else
+ sh_map[i] = new_i++;
+ }
+ if (new_i - 1 >= SHN_LORESERVE)
+ {
+ *err = ENOTSUP;
+ return "Too many copied sections";
+ }
+ eow->shdrs = XNEWVEC (unsigned char, shdr_size * (new_i - 1));
+
+ /* Then perform the actual copying. */
+ new_i = 0;
+ for (i = 1; i < shnum; ++i)
+ {
+ unsigned char *shdr;
+ unsigned int sh_name, sh_type;
+ const char *name;
+ off_t offset;
+ off_t length;
+ simple_object_write_section *dest;
+ off_t flags;
+ unsigned char *buf;
+
+ if (pfnret[i - 1])
+ continue;
+
+ new_i++;
+ 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);
+ XDELETEVEC (symtab_indices_shndx);
+ return "ELF section name out of range";
+ }
+
+ name = pfnname[i - 1];
+ 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);
+
+ dest = simple_object_write_create_section (dobj, pfnname[i - 1],
+ 0, &errmsg, err);
+ if (dest == NULL)
+ {
+ XDELETEVEC (names);
+ XDELETEVEC (shdrs);
+ XDELETEVEC (symtab_indices_shndx);
+ return errmsg;
+ }
+
+ /* Record the SHDR of the source. */
+ memcpy (eow->shdrs + (new_i - 1) * shdr_size, shdr, shdr_size);
+ shdr = eow->shdrs + (new_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. */
+ 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);
+ XDELETEVEC (symtab_indices_shndx);
+ return errmsg;
+ }
+
+ /* If we are processing .symtab purge any symbols
+ in discarded sections. */
+ 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);
+ size_t prevailing_name_idx = 0;
+ unsigned char *ent;
+ unsigned *shndx_table = NULL;
+ /* Read the section index table if present. */
+ if (symtab_indices_shndx[i - 1] != 0)
+ {
+ unsigned char *sidxhdr = shdrs + (strtab - 1) * shdr_size;
+ off_t sidxoff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ sidxhdr, sh_offset, Elf_Addr);
+ size_t sidxsz = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ sidxhdr, sh_size, Elf_Addr);
+ shndx_table = (unsigned *)XNEWVEC (char, sidxsz);
+ simple_object_internal_read (sobj->descriptor,
+ sobj->offset + sidxoff,
+ (unsigned char *)shndx_table,
+ sidxsz, &errmsg, err);
+ }
+
+ /* Find a WEAK HIDDEN symbol which name we will use for removed
+ symbols. We know there's a prevailing weak hidden symbol
+ at the start of the .debug_info section. */
+ 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;
+ 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;
+ }
+ if (st_shndx == SHN_XINDEX)
+ st_shndx = type_functions->fetch_Elf_Word
+ ((unsigned char *)(shndx_table + (ent - buf) / entsize));
+
+ if (st_shndx != SHN_COMMON
+ && !(st_shndx != SHN_UNDEF
+ && st_shndx < shnum
+ && pfnret[st_shndx - 1] == -1)
+ && ELF_ST_BIND (*st_info) == STB_WEAK
+ && *st_other == STV_HIDDEN)
+ {
+ prevailing_name_idx = ELF_FETCH_FIELD (type_functions,
+ ei_class, Sym, ent,
+ st_name, Elf_Word);
+ break;
+ }
+ }
+
+ 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 raw_st_shndx = st_shndx;
+ 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;
+ }
+ if (st_shndx == SHN_XINDEX)
+ st_shndx = type_functions->fetch_Elf_Word
+ ((unsigned char *)(shndx_table + (ent - buf) / entsize));
+ /* Eliminate all COMMONs - this includes __gnu_lto_slim
+ which otherwise cause endless LTO plugin invocation.
+ FIXME: remove the condition once we remove emission
+ of __gnu_lto_slim symbol. */
+ if (st_shndx == SHN_COMMON)
+ 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. */
+ int bind = ELF_ST_BIND (*st_info);
+ int other = STV_DEFAULT;
+ if (bind == STB_LOCAL)
+ {
+ /* Make discarded local symbols unnamed and
+ defined in the first prevailing section. */
+ ELF_SET_FIELD (type_functions, ei_class, Sym,
+ ent, st_name, Elf_Word, 0);
+ ELF_SET_FIELD (type_functions, ei_class, Sym,
+ ent, st_shndx, Elf_Half,
+ sh_map[first_shndx]);
+ }
+ else
+ {
+ /* Make discarded global symbols hidden weak
+ undefined and sharing a name of a prevailing
+ symbol. */
+ bind = STB_WEAK;
+ other = STV_HIDDEN;
+ ELF_SET_FIELD (type_functions, ei_class, Sym,
+ ent, st_name, Elf_Word,
+ prevailing_name_idx);
+ ELF_SET_FIELD (type_functions, ei_class, Sym,
+ ent, st_shndx, Elf_Half, SHN_UNDEF);
+ }
+ *st_other = other;
+ *st_info = ELF_ST_INFO (bind, STT_NOTYPE);
+ 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);
+ }
+ else if (raw_st_shndx < SHN_LORESERVE
+ || raw_st_shndx == SHN_XINDEX)
+ /* Remap the section reference. */
+ ELF_SET_FIELD (type_functions, ei_class, Sym,
+ ent, st_shndx, Elf_Half, sh_map[st_shndx]);
+ }
+ XDELETEVEC (shndx_table);
+ }
+ else if (sh_type == SHT_GROUP)
+ {
+ /* Remap section indices in groups and remove removed members. */
+ unsigned char *ent, *dst;
+ for (dst = ent = buf + 4; ent < buf + length; ent += 4)
+ {
+ unsigned shndx = type_functions->fetch_Elf_Word (ent);
+ if (pfnret[shndx - 1] == -1)
+ ;
+ else
+ {
+ type_functions->set_Elf_Word (dst, sh_map[shndx]);
+ dst += 4;
+ }
+ }
+ /* Adjust the length. */
+ length = dst - buf;
+ }
+
+ errmsg = simple_object_write_add_data (dobj, dest,
+ buf, length, 1, err);
+ XDELETEVEC (buf);
+ if (errmsg)
+ {
+ XDELETEVEC (names);
+ XDELETEVEC (shdrs);
+ XDELETEVEC (symtab_indices_shndx);
+ return errmsg;
+ }
+
+ flags = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_flags, Elf_Addr);
+ /* Remap the section references. */
+ {
+ unsigned int sh_info, sh_link;
+ if (flags & SHF_INFO_LINK || sh_type == SHT_REL || sh_type == SHT_RELA)
+ {
+ sh_info = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_info, Elf_Word);
+ if (sh_info < SHN_LORESERVE
+ || sh_info > SHN_HIRESERVE)
+ sh_info = sh_map[sh_info];
+ ELF_SET_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_info, Elf_Word, sh_info);
+ }
+ sh_link = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_link, Elf_Word);
+ if (sh_link < SHN_LORESERVE
+ || sh_link > SHN_HIRESERVE)
+ sh_link = sh_map[sh_link];
+ ELF_SET_FIELD (type_functions, ei_class, Shdr,
+ shdr, sh_link, Elf_Word, sh_link);
+ }
+ /* The debugobj doesn't contain any code, thus no trampolines.
+ Even when the original object needs trampolines, debugobj
+ doesn't. */
+ if (strcmp (name, ".note.GNU-stack") == 0)
+ flags &= ~SHF_EXECINSTR;
+ /* Clear SHF_EXCLUDE on to be preserved sections. */
+ 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);
+ XDELETEVEC (symtab_indices_shndx);
+ XDELETEVEC (sh_map);
+
+ 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
};
projects / deliverable / binutils-gdb.git / blobdiff