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ede7143386ce1cf086066eec06dbdf7cf6d4cfee
vpp/src/vppinfra/elf.c
Damjan Marion 4a251d0a9c vppinfra: fix tests 
Type: fix
Change-Id: If59a66aae658dd35dbcb4987ab00c306b3c6e2e2
Signed-off-by: Damjan Marion <damarion@cisco.com>
2021-05-06 16:29:00 +00:00

2043 lines
46 KiB
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/*
* Copyright (c) 2015 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <vppinfra/bitmap.h>
#include <vppinfra/byte_order.h>
#include <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vppinfra/vec.h>
#include <vppinfra/elf.h>
always_inline void
elf_swap_first_header (elf_main_t * em, elf_first_header_t * h)
{
h->architecture = elf_swap_u16 (em, h->architecture);
h->file_type = elf_swap_u16 (em, h->file_type);
h->file_version = elf_swap_u32 (em, h->file_version);
}
always_inline void
elf_swap_verneed (elf_dynamic_version_need_t * n)
{
#define _(t,f) n->f = clib_byte_swap_##t (n->f);
foreach_elf_dynamic_version_need_field
#undef _
}
always_inline void
elf_swap_verneed_aux (elf_dynamic_version_need_aux_t * n)
{
#define _(t,f) n->f = clib_byte_swap_##t (n->f);
foreach_elf_dynamic_version_need_aux_field
#undef _
}
__clib_export clib_error_t *
elf_get_section_by_name (elf_main_t * em, char *section_name,
elf_section_t ** result)
{
uword *p;
p = hash_get_mem (em->section_by_name, section_name);
if (!p)
return clib_error_return (0, "no such section `%s'", section_name);
*result = vec_elt_at_index (em->sections, p[0]);
return 0;
}
elf_section_t *
elf_get_section_by_start_address_no_check (elf_main_t * em,
uword start_address)
{
uword *p = hash_get (em->section_by_start_address, start_address);
return p ? vec_elt_at_index (em->sections, p[0]) : 0;
}
__clib_export clib_error_t *
elf_get_section_by_start_address (elf_main_t *em, uword start_address,
elf_section_t **result)
{
elf_section_t *s =
elf_get_section_by_start_address_no_check (em, start_address);
if (!s)
return clib_error_return (0, "no section with address 0x%wx",
start_address);
*result = s;
return 0;
}
static u8 *
format_elf_section_type (u8 * s, va_list * args)
{
elf_section_type_t type = va_arg (*args, elf_section_type_t);
char *t = 0;
switch (type)
{
#define _(f,i) case ELF_SECTION_##f: t = #f; break;
foreach_elf_section_type
#undef _
}
if (!t)
s = format (s, "unknown 0x%x", type);
else
s = format (s, "%s", t);
return s;
}
static u8 *
format_elf_section (u8 * s, va_list * args)
{
elf_main_t *em = va_arg (*args, elf_main_t *);
elf_section_t *es = va_arg (*args, elf_section_t *);
elf64_section_header_t *h = &es->header;
if (!h)
return format (s, "%=40s%=10s%=20s%=8s%=16s%=16s%=16s",
"Name", "Index", "Type", "Size", "Align", "Address",
"File offset");
s = format (s, "%-40s%10d%=20U%8Lx%16d%16Lx %Lx-%Lx",
elf_section_name (em, es),
es->index,
format_elf_section_type, h->type,
h->file_size,
h->align,
h->exec_address, h->file_offset, h->file_offset + h->file_size);
if (h->flags != 0)
{
#define _(f,i) \
if (h->flags & ELF_SECTION_FLAG_##f) s = format (s, " %s", #f);
foreach_elf_section_flag;
#undef _
}
return s;
}
static u8 *
format_elf_segment_type (u8 * s, va_list * args)
{
elf_segment_type_t type = va_arg (*args, elf_segment_type_t);
char *t = 0;
switch (type)
{
#define _(f,i) case ELF_SEGMENT_##f: t = #f; break;
foreach_elf_segment_type
#undef _
}
if (!t)
s = format (s, "unknown 0x%x", type);
else
s = format (s, "%s", t);
return s;
}
static u8 *
format_elf_segment (u8 * s, va_list * args)
{
elf_segment_t *es = va_arg (*args, elf_segment_t *);
elf64_segment_header_t *h = &es->header;
if (!h)
return format (s, "%=16s%=16s%=16s%=16s",
"Type", "Virt. Address", "Phys. Address", "Size");
s = format (s, "%=16U%16Lx%16Lx%16Lx%16Lx",
format_elf_segment_type, h->type,
h->virtual_address,
h->physical_address, h->memory_size, h->file_offset);
if (h->flags != 0)
{
#define _(f,i) \
if (h->flags & ELF_SEGMENT_FLAG_##f) s = format (s, " %s", #f);
foreach_elf_segment_flag;
#undef _
}
return s;
}
static u8 *
format_elf_symbol_binding_and_type (u8 * s, va_list * args)
{
int bt = va_arg (*args, int);
int b, t;
char *type_string = 0;
char *binding_string = 0;
switch ((b = ((bt >> 4) & 0xf)))
{
#define _(f,n) case n: binding_string = #f; break;
foreach_elf_symbol_binding;
#undef _
default:
break;
}
switch ((t = ((bt >> 0) & 0xf)))
{
#define _(f,n) case n: type_string = #f; break;
foreach_elf_symbol_type;
#undef _
default:
break;
}
if (binding_string)
s = format (s, "%s", binding_string);
else
s = format (s, "binding 0x%x", b);
if (type_string)
s = format (s, " %s", type_string);
else
s = format (s, " type 0x%x", t);
return s;
}
static u8 *
format_elf_symbol_visibility (u8 * s, va_list * args)
{
int visibility = va_arg (*args, int);
char *t = 0;
switch (visibility)
{
#define _(f,n) case n: t = #f; break;
foreach_elf_symbol_visibility
#undef _
}
if (t)
return format (s, "%s", t);
else
return format (s, "unknown 0x%x", visibility);
}
static u8 *
format_elf_symbol_section_name (u8 * s, va_list * args)
{
elf_main_t *em = va_arg (*args, elf_main_t *);
int si = va_arg (*args, int);
char *t = 0;
if (si < vec_len (em->sections))
{
elf_section_t *es = vec_elt_at_index (em->sections, si);
return format (s, "%s", elf_section_name (em, es));
}
if (si >= ELF_SYMBOL_SECTION_RESERVED_LO
&& si <= ELF_SYMBOL_SECTION_RESERVED_HI)
{
switch (si)
{
#define _(f,n) case n: t = #f; break;
foreach_elf_symbol_reserved_section_index
#undef _
default:
break;
}
}
if (t)
return format (s, "%s", t);
else
return format (s, "unknown 0x%x", si);
}
u8 *
format_elf_symbol (u8 * s, va_list * args)
{
elf_main_t *em = va_arg (*args, elf_main_t *);
elf_symbol_table_t *t = va_arg (*args, elf_symbol_table_t *);
elf64_symbol_t *sym = va_arg (*args, elf64_symbol_t *);
if (!sym)
return format (s, "%=32s%=16s%=16s%=16s%=16s%=16s",
"Symbol", "Size", "Value", "Type", "Visibility",
"Section");
s = format (s, "%-32s%16Ld%16Lx%=16U%=16U%U",
elf_symbol_name (t, sym),
sym->size, sym->value,
format_elf_symbol_binding_and_type, sym->binding_and_type,
format_elf_symbol_visibility, sym->visibility,
format_elf_symbol_section_name, em, sym->section_index);
return s;
}
static u8 *
format_elf_relocation_type (u8 * s, va_list * args)
{
elf_main_t *em = va_arg (*args, elf_main_t *);
int type = va_arg (*args, int);
char *t = 0;
switch (em->first_header.architecture)
{
#define _(f,i) [i] = #f,
case ELF_ARCH_X86_64:
{
static char *tab[] = {
foreach_elf_x86_64_relocation_type
};
#undef _
if (type < ARRAY_LEN (tab))
t = tab[type];
break;
}
default:
break;
}
if (!t)
s = format (s, "0x%02x", type);
else
s = format (s, "%s", t);
return s;
}
static u8 *
format_elf_relocation (u8 * s, va_list * args)
{
elf_main_t *em = va_arg (*args, elf_main_t *);
elf_relocation_with_addend_t *r =
va_arg (*args, elf_relocation_with_addend_t *);
elf_symbol_table_t *t;
elf64_symbol_t *sym;
if (!r)
return format (s, "%=16s%=16s%=16s", "Address", "Type", "Symbol");
t = vec_elt_at_index (em->symbol_tables, 0);
sym = vec_elt_at_index (t->symbols, r->symbol_and_type >> 32);
s = format (s, "%16Lx%16U",
r->address,
format_elf_relocation_type, em, r->symbol_and_type & 0xff);
if (sym->section_index != 0)
{
elf_section_t *es;
es = vec_elt_at_index (em->sections, sym->section_index);
s = format (s, " (section %s)", elf_section_name (em, es));
}
if (sym->name != 0)
s = format (s, " %s", elf_symbol_name (t, sym));
{
i64 a = r->addend;
if (a != 0)
s = format (s, " %c 0x%Lx", a > 0 ? '+' : '-', a > 0 ? a : -a);
}
return s;
}
static u8 *
format_elf_dynamic_entry_type (u8 * s, va_list * args)
{
u32 type = va_arg (*args, u32);
char *t = 0;
switch (type)
{
#define _(f,n) case n: t = #f; break;
foreach_elf_dynamic_entry_type;
#undef _
default:
break;
}
if (t)
return format (s, "%s", t);
else
return format (s, "unknown 0x%x", type);
}
static u8 *
format_elf_dynamic_entry (u8 * s, va_list * args)
{
elf_main_t *em = va_arg (*args, elf_main_t *);
elf64_dynamic_entry_t *e = va_arg (*args, elf64_dynamic_entry_t *);
if (!e)
return format (s, "%=40s%=16s", "Type", "Data");
s = format (s, "%=40U", format_elf_dynamic_entry_type, (u32) e->type);
switch (e->type)
{
case ELF_DYNAMIC_ENTRY_NEEDED_LIBRARY:
case ELF_DYNAMIC_ENTRY_RPATH:
case ELF_DYNAMIC_ENTRY_RUN_PATH:
s = format (s, "%s", em->dynamic_string_table + e->data);
break;
case ELF_DYNAMIC_ENTRY_INIT_FUNCTION:
case ELF_DYNAMIC_ENTRY_FINI_FUNCTION:
case ELF_DYNAMIC_ENTRY_SYMBOL_HASH:
case ELF_DYNAMIC_ENTRY_GNU_HASH:
case ELF_DYNAMIC_ENTRY_STRING_TABLE:
case ELF_DYNAMIC_ENTRY_SYMBOL_TABLE:
case ELF_DYNAMIC_ENTRY_PLT_GOT:
case ELF_DYNAMIC_ENTRY_PLT_RELOCATION_ADDRESS:
case ELF_DYNAMIC_ENTRY_RELA_ADDRESS:
case ELF_DYNAMIC_ENTRY_VERSION_NEED:
case ELF_DYNAMIC_ENTRY_VERSYM:
{
elf_section_t *es =
elf_get_section_by_start_address_no_check (em, e->data);
if (es)
s = format (s, "section %s", elf_section_name (em, es));
else
s = format (s, "0x%Lx", e->data);
break;
}
default:
s = format (s, "0x%Lx", e->data);
break;
}
return s;
}
static u8 *
format_elf_architecture (u8 * s, va_list * args)
{
int a = va_arg (*args, int);
char *t;
switch (a)
{
#define _(f,n) case n: t = #f; break;
foreach_elf_architecture;
#undef _
default:
return format (s, "unknown 0x%x", a);
}
return format (s, "%s", t);
}
static u8 *
format_elf_abi (u8 * s, va_list * args)
{
int a = va_arg (*args, int);
char *t;
switch (a)
{
#define _(f,n) case n: t = #f; break;
foreach_elf_abi;
#undef _
default:
return format (s, "unknown 0x%x", a);
}
return format (s, "%s", t);
}
static u8 *
format_elf_file_class (u8 * s, va_list * args)
{
int a = va_arg (*args, int);
char *t;
switch (a)
{
#define _(f) case ELF_##f: t = #f; break;
foreach_elf_file_class;
#undef _
default:
return format (s, "unknown 0x%x", a);
}
return format (s, "%s", t);
}
static u8 *
format_elf_file_type (u8 * s, va_list * args)
{
int a = va_arg (*args, int);
char *t;
if (a >= ELF_ARCH_SPECIFIC_LO && a <= ELF_ARCH_SPECIFIC_HI)
return format (s, "arch-specific 0x%x", a - ELF_ARCH_SPECIFIC_LO);
if (a >= ELF_OS_SPECIFIC_LO && a <= ELF_OS_SPECIFIC_HI)
return format (s, "os-specific 0x%x", a - ELF_OS_SPECIFIC_LO);
switch (a)
{
#define _(f,n) case n: t = #f; break;
foreach_elf_file_type;
#undef _
default:
return format (s, "unknown 0x%x", a);
}
return format (s, "%s", t);
}
static u8 *
format_elf_data_encoding (u8 * s, va_list * args)
{
int a = va_arg (*args, int);
char *t;
switch (a)
{
#define _(f) case ELF_##f: t = #f; break;
foreach_elf_data_encoding;
#undef _
default:
return format (s, "unknown 0x%x", a);
}
return format (s, "%s", t);
}
static int
elf_section_offset_compare (void *a1, void *a2)
{
elf_section_t *s1 = a1;
elf_section_t *s2 = a2;
return ((i64) s1->header.file_offset - (i64) s2->header.file_offset);
}
static int
elf_segment_va_compare (void *a1, void *a2)
{
elf_segment_t *s1 = a1;
elf_segment_t *s2 = a2;
return ((i64) s1->header.virtual_address -
(i64) s2->header.virtual_address);
}
__clib_export u8 *
format_elf_main (u8 *s, va_list *args)
{
elf_main_t *em = va_arg (*args, elf_main_t *);
u32 verbose = va_arg (*args, u32);
elf64_file_header_t *fh = &em->file_header;
s =
format (s,
"File header: machine: %U, file type/class %U/%U, data-encoding: %U, abi: %U version %d\n",
format_elf_architecture, em->first_header.architecture,
format_elf_file_type, em->first_header.file_type,
format_elf_file_class, em->first_header.file_class,
format_elf_data_encoding, em->first_header.data_encoding,
format_elf_abi, em->first_header.abi,
em->first_header.abi_version);
s = format (s, " entry 0x%Lx, arch-flags 0x%x",
em->file_header.entry_point, em->file_header.flags);
if (em->interpreter)
s = format (s, "\n interpreter: %s", em->interpreter);
{
elf_section_t *h, *copy;
copy = 0;
vec_foreach (h, em->sections) if (h->header.type != ~0)
vec_add1 (copy, h[0]);
vec_sort_with_function (copy, elf_section_offset_compare);
s = format (s, "\nSections %d at file offset 0x%Lx-0x%Lx:\n",
fh->section_header_count,
fh->section_header_file_offset,
fh->section_header_file_offset +
(u64) fh->section_header_count * fh->section_header_size);
s = format (s, "%U\n", format_elf_section, em, 0);
vec_foreach (h, copy) s = format (s, "%U\n", format_elf_section, em, h);
vec_free (copy);
}
{
elf_segment_t *h, *copy;
copy = 0;
vec_foreach (h, em->segments)
if (h->header.type != ELF_SEGMENT_UNUSED && h->header.type != ~0)
vec_add1 (copy, h[0]);
/* Sort segments by address. */
vec_sort_with_function (copy, elf_segment_va_compare);
s = format (s, "\nSegments: %d at file offset 0x%Lx-0x%Lx:\n",
fh->segment_header_count,
fh->segment_header_file_offset,
(u64) fh->segment_header_file_offset +
(u64) fh->segment_header_count *
(u64) fh->segment_header_size);
s = format (s, "%U\n", format_elf_segment, 0);
vec_foreach (h, copy) s = format (s, "%U\n", format_elf_segment, h);
vec_free (copy);
}
if ((verbose & FORMAT_ELF_MAIN_SYMBOLS) && vec_len (em->symbol_tables) > 0)
{
elf_symbol_table_t *t;
elf64_symbol_t *sym;
elf_section_t *es;
vec_foreach (t, em->symbol_tables)
{
es = vec_elt_at_index (em->sections, t->section_index);
s =
format (s, "\nSymbols for section %s:\n",
elf_section_name (em, es));
s = format (s, "%U\n", format_elf_symbol, em, 0, 0);
vec_foreach (sym, t->symbols)
s = format (s, "%U\n", format_elf_symbol, em, t, sym);
}
}
if ((verbose & FORMAT_ELF_MAIN_RELOCATIONS)
&& vec_len (em->relocation_tables) > 0)
{
elf_relocation_table_t *t;
elf_relocation_with_addend_t *r;
elf_section_t *es;
vec_foreach (t, em->relocation_tables)
{
es = vec_elt_at_index (em->sections, t->section_index);
r = t->relocations;
s = format (s, "\nRelocations for section %s:\n",
elf_section_name (em, es));
s = format (s, "%U\n", format_elf_relocation, em, 0);
vec_foreach (r, t->relocations)
{
s = format (s, "%U\n", format_elf_relocation, em, r);
}
}
}
if ((verbose & FORMAT_ELF_MAIN_DYNAMIC)
&& vec_len (em->dynamic_entries) > 0)
{
elf64_dynamic_entry_t *es, *e;
s = format (s, "\nDynamic linker information:\n");
es = vec_dup (em->dynamic_entries);
s = format (s, "%U\n", format_elf_dynamic_entry, em, 0);
vec_foreach (e, es)
s = format (s, "%U\n", format_elf_dynamic_entry, em, e);
}
return s;
}
static void
elf_parse_segments (elf_main_t * em, void *data)
{
void *d = data + em->file_header.segment_header_file_offset;
uword n = em->file_header.segment_header_count;
uword i;
vec_resize (em->segments, n);
for (i = 0; i < n; i++)
{
em->segments[i].index = i;
if (em->first_header.file_class == ELF_64BIT)
{
elf64_segment_header_t *h = d;
#define _(t,f) em->segments[i].header.f = elf_swap_##t (em, h->f);
foreach_elf64_segment_header
#undef _
d = (h + 1);
}
else
{
elf32_segment_header_t *h = d;
#define _(t,f) em->segments[i].header.f = elf_swap_##t (em, h->f);
foreach_elf32_segment_header
#undef _
d = (h + 1);
}
}
}
static void
elf_parse_sections (elf_main_t * em, void *data)
{
elf64_file_header_t *fh = &em->file_header;
elf_section_t *s;
void *d = data + fh->section_header_file_offset;
uword n = fh->section_header_count;
uword i;
vec_resize (em->sections, n);
for (i = 0; i < n; i++)
{
s = em->sections + i;
s->index = i;
if (em->first_header.file_class == ELF_64BIT)
{
elf64_section_header_t *h = d;
#define _(t,f) em->sections[i].header.f = elf_swap_##t (em, h->f);
foreach_elf64_section_header
#undef _
d = (h + 1);
}
else
{
elf32_section_header_t *h = d;
#define _(t,f) em->sections[i].header.f = elf_swap_##t (em, h->f);
foreach_elf32_section_header
#undef _
d = (h + 1);
}
if (s->header.type != ELF_SECTION_NO_BITS)
vec_add (s->contents, data + s->header.file_offset,
s->header.file_size);
}
s = vec_elt_at_index (em->sections, fh->section_header_string_table_index);
em->section_by_name
= hash_create_string ( /* # elts */ vec_len (em->sections),
/* sizeof of value */ sizeof (uword));
vec_foreach (s, em->sections)
{
hash_set_mem (em->section_by_name,
elf_section_name (em, s), s - em->sections);
hash_set (em->section_by_start_address,
s->header.exec_address, s - em->sections);
}
}
static void
add_symbol_table (elf_main_t * em, elf_section_t * s)
{
elf_symbol_table_t *tab;
elf32_symbol_t *sym32;
elf64_symbol_t *sym64;
uword i;
if (s->header.type == ELF_SECTION_DYNAMIC_SYMBOL_TABLE)
em->dynamic_symbol_table_index = vec_len (em->symbol_tables);
vec_add2 (em->symbol_tables, tab, 1);
tab->section_index = s->index;
if (em->first_header.file_class == ELF_64BIT)
{
tab->symbols =
elf_get_section_contents (em, s - em->sections,
sizeof (tab->symbols[0]));
for (i = 0; i < vec_len (tab->symbols); i++)
{
#define _(t,f) tab->symbols[i].f = elf_swap_##t (em, tab->symbols[i].f);
foreach_elf64_symbol_header;
#undef _
}
}
else
{
sym32 =
elf_get_section_contents (em, s - em->sections, sizeof (sym32[0]));
vec_clone (tab->symbols, sym32);
for (i = 0; i < vec_len (tab->symbols); i++)
{
#define _(t,f) tab->symbols[i].f = elf_swap_##t (em, sym32[i].f);
foreach_elf32_symbol_header;
#undef _
}
}
if (s->header.link == 0)
return;
tab->string_table =
elf_get_section_contents (em, s->header.link,
sizeof (tab->string_table[0]));
tab->symbol_by_name =
hash_create_string ( /* # elts */ vec_len (tab->symbols),
/* sizeof of value */ sizeof (uword));
vec_foreach (sym64, tab->symbols)
{
if (sym64->name != 0)
hash_set_mem (tab->symbol_by_name,
tab->string_table + sym64->name, sym64 - tab->symbols);
}
}
static void
add_relocation_table (elf_main_t * em, elf_section_t * s)
{
uword has_addend = s->header.type == ELF_SECTION_RELOCATION_ADD;
elf_relocation_table_t *t;
uword i;
vec_add2 (em->relocation_tables, t, 1);
t->section_index = s - em->sections;
if (em->first_header.file_class == ELF_64BIT)
{
elf64_relocation_t *r, *rs;
rs = elf_get_section_contents (em, t->section_index,
sizeof (rs[0]) +
has_addend * sizeof (rs->addend[0]));
if (em->need_byte_swap)
{
r = rs;
for (i = 0; i < vec_len (r); i++)
{
r->address = elf_swap_u64 (em, r->address);
r->symbol_and_type = elf_swap_u32 (em, r->symbol_and_type);
if (has_addend)
r->addend[0] = elf_swap_u64 (em, r->addend[0]);
r = elf_relocation_next (r, s->header.type);
}
}
vec_resize (t->relocations, vec_len (rs));
clib_memcpy (t->relocations, rs, vec_bytes (t->relocations));
vec_free (rs);
}
else
{
elf_relocation_with_addend_t *r;
elf32_relocation_t *r32, *r32s;
r32s = elf_get_section_contents (em, t->section_index,
sizeof (r32s[0]) +
has_addend * sizeof (r32s->addend[0]));
vec_resize (t->relocations, vec_len (r32s));
r32 = r32s;
vec_foreach (r, t->relocations)
{
r->address = elf_swap_u32 (em, r32->address);
r->symbol_and_type = elf_swap_u32 (em, r->symbol_and_type);
r->addend = has_addend ? elf_swap_u32 (em, r32->addend[0]) : 0;
r32 = elf_relocation_next (r32, s->header.type);
}
vec_free (r32s);
}
}
void
elf_parse_symbols (elf_main_t * em)
{
elf_section_t *s;
/* No need to parse symbols twice. */
if (em->parsed_symbols)
return;
em->parsed_symbols = 1;
vec_foreach (s, em->sections)
{
switch (s->header.type)
{
case ELF_SECTION_SYMBOL_TABLE:
case ELF_SECTION_DYNAMIC_SYMBOL_TABLE:
add_symbol_table (em, s);
break;
case ELF_SECTION_RELOCATION_ADD:
case ELF_SECTION_RELOCATION:
add_relocation_table (em, s);
break;
default:
break;
}
}
}
__clib_export void
elf_set_dynamic_entries (elf_main_t *em)
{
uword i;
/* Start address for sections may have changed. */
{
elf64_dynamic_entry_t *e;
vec_foreach (e, em->dynamic_entries)
{
switch (e->type)
{
case ELF_DYNAMIC_ENTRY_INIT_FUNCTION:
case ELF_DYNAMIC_ENTRY_FINI_FUNCTION:
case ELF_DYNAMIC_ENTRY_SYMBOL_HASH:
case ELF_DYNAMIC_ENTRY_GNU_HASH:
case ELF_DYNAMIC_ENTRY_STRING_TABLE:
case ELF_DYNAMIC_ENTRY_SYMBOL_TABLE:
case ELF_DYNAMIC_ENTRY_PLT_GOT:
case ELF_DYNAMIC_ENTRY_PLT_RELOCATION_ADDRESS:
case ELF_DYNAMIC_ENTRY_RELA_ADDRESS:
case ELF_DYNAMIC_ENTRY_VERSION_NEED:
case ELF_DYNAMIC_ENTRY_VERSYM:
{
elf_section_t *es =
elf_get_section_by_start_address_no_check (em, e->data);
/* If section is not found just leave e->data alone. */
if (es)
e->data = es->header.exec_address;
break;
}
default:
break;
}
}
}
if (em->first_header.file_class == ELF_64BIT)
{
elf64_dynamic_entry_t *e, *es;
es = em->dynamic_entries;
if (em->need_byte_swap)
{
es = vec_dup (es);
vec_foreach (e, es)
{
e->type = elf_swap_u64 (em, e->type);
e->data = elf_swap_u64 (em, e->data);
}
}
elf_set_section_contents (em, em->dynamic_section_index, es,
vec_bytes (es));
if (es != em->dynamic_entries)
vec_free (es);
}
else
{
elf32_dynamic_entry_t *es;
vec_clone (es, em->dynamic_entries);
if (em->need_byte_swap)
{
for (i = 0; i < vec_len (es); i++)
{
es[i].type = elf_swap_u32 (em, em->dynamic_entries[i].type);
es[i].data = elf_swap_u32 (em, em->dynamic_entries[i].data);
}
}
elf_set_section_contents (em, em->dynamic_section_index, es,
vec_bytes (es));
vec_free (es);
}
}
clib_error_t *
elf_parse (elf_main_t * em, void *data, uword data_bytes)
{
elf_first_header_t *h = data;
elf64_file_header_t *fh = &em->file_header;
clib_error_t *error = 0;
{
char *save = em->file_name;
clib_memset (em, 0, sizeof (em[0]));
em->file_name = save;
}
em->first_header = h[0];
em->need_byte_swap =
CLIB_ARCH_IS_BIG_ENDIAN != (h->data_encoding ==
ELF_TWOS_COMPLEMENT_BIG_ENDIAN);
elf_swap_first_header (em, &em->first_header);
if (!(h->magic[0] == 0x7f
&& h->magic[1] == 'E' && h->magic[2] == 'L' && h->magic[3] == 'F'))
return clib_error_return (0, "`%s': bad magic", em->file_name);
if (h->file_class == ELF_64BIT)
{
elf64_file_header_t *h64 = (void *) (h + 1);
#define _(t,f) fh->f = elf_swap_##t (em, h64->f);
foreach_elf64_file_header
#undef _
}
else
{
elf32_file_header_t *h32 = (void *) (h + 1);
#define _(t,f) fh->f = elf_swap_##t (em, h32->f);
foreach_elf32_file_header
#undef _
}
elf_parse_segments (em, data);
elf_parse_sections (em, data);
/* Figure which sections are contained in each segment. */
{
elf_segment_t *g;
elf_section_t *s;
vec_foreach (g, em->segments)
{
u64 g_lo, g_hi;
u64 s_lo, s_hi;
if (g->header.memory_size == 0)
continue;
g_lo = g->header.virtual_address;
g_hi = g_lo + g->header.memory_size;
vec_foreach (s, em->sections)
{
s_lo = s->header.exec_address;
s_hi = s_lo + s->header.file_size;
if (s_lo >= g_lo && s_hi <= g_hi)
{
g->section_index_bitmap =
clib_bitmap_ori (g->section_index_bitmap, s->index);
s->segment_index_bitmap =
clib_bitmap_ori (s->segment_index_bitmap, g->index);
}
}
}
}
return error;
}
#ifdef CLIB_UNIX
static void
add_dynamic_entries (elf_main_t * em, elf_section_t * s)
{
uword i;
/* Can't have more than one dynamic section. */
ASSERT (em->dynamic_section_index == 0);
em->dynamic_section_index = s->index;
if (em->first_header.file_class == ELF_64BIT)
{
elf64_dynamic_entry_t *e;
e = elf_get_section_contents (em, s - em->sections, sizeof (e[0]));
if (em->need_byte_swap)
for (i = 0; i < vec_len (e); i++)
{
e[i].type = elf_swap_u64 (em, e[i].type);
e[i].data = elf_swap_u64 (em, e[i].data);
}
em->dynamic_entries = e;
}
else
{
elf32_dynamic_entry_t *e;
e = elf_get_section_contents (em, s - em->sections, sizeof (e[0]));
vec_clone (em->dynamic_entries, e);
if (em->need_byte_swap)
for (i = 0; i < vec_len (e); i++)
{
em->dynamic_entries[i].type = elf_swap_u32 (em, e[i].type);
em->dynamic_entries[i].data = elf_swap_u32 (em, e[i].data);
}
vec_free (e);
}
}
static void
byte_swap_verneed (elf_main_t * em, elf_dynamic_version_need_union_t * vus)
{
uword *entries_swapped = 0;
uword i, j;
for (i = 0; i < vec_len (vus); i++)
{
elf_dynamic_version_need_union_t *n = vec_elt_at_index (vus, i);
elf_dynamic_version_need_union_t *a;
if (clib_bitmap_get (entries_swapped, i))
continue;
elf_swap_verneed (&n->need);
entries_swapped = clib_bitmap_set (entries_swapped, i, 1);
if (n->need.first_aux_offset != 0)
{
ASSERT (n->need.first_aux_offset % sizeof (n[0]) == 0);
j = i + (n->need.first_aux_offset / sizeof (n[0]));
while (1)
{
a = vec_elt_at_index (vus, j);
if (!clib_bitmap_get (entries_swapped, j))
{
entries_swapped = clib_bitmap_set (entries_swapped, j, 1);
elf_swap_verneed_aux (&a->aux);
}
if (a->aux.next_offset == 0)
break;
ASSERT (a->aux.next_offset % sizeof (a->aux) == 0);
j += (a->aux.next_offset / sizeof (a->aux));
}
}
}
clib_bitmap_free (entries_swapped);
}
static void set_dynamic_verneed (elf_main_t * em) __attribute__ ((unused));
static void
set_dynamic_verneed (elf_main_t * em)
{
elf_dynamic_version_need_union_t *vus = em->verneed;
if (em->need_byte_swap)
{
vus = vec_dup (vus);
byte_swap_verneed (em, vus);
}
elf_set_section_contents (em, em->verneed_section_index, vus,
vec_bytes (vus));
if (vus != em->verneed)
vec_free (vus);
}
static void
set_symbol_table (elf_main_t * em, u32 table_index) __attribute__ ((unused));
static void
set_symbol_table (elf_main_t * em, u32 table_index)
{
elf_symbol_table_t *tab = vec_elt_at_index (em->symbol_tables, table_index);
if (em->first_header.file_class == ELF_64BIT)
{
elf64_symbol_t *s, *syms;
syms = vec_dup (tab->symbols);
vec_foreach (s, syms)
{
#define _(t,f) s->f = elf_swap_##t (em, s->f);
foreach_elf64_symbol_header;
#undef _
}
elf_set_section_contents (em, tab->section_index,
syms, vec_bytes (syms));
}
else
{
elf32_symbol_t *syms;
uword i;
vec_clone (syms, tab->symbols);
for (i = 0; i < vec_len (tab->symbols); i++)
{
#define _(t,f) syms[i].f = elf_swap_##t (em, tab->symbols[i].f);
foreach_elf32_symbol_header;
#undef _
}
elf_set_section_contents (em, tab->section_index,
syms, vec_bytes (syms));
}
}
static char *
elf_find_interpreter (elf_main_t * em, void *data)
{
elf_segment_t *g;
elf_section_t *s;
uword *p;
vec_foreach (g, em->segments)
{
if (g->header.type == ELF_SEGMENT_INTERP)
break;
}
if (g >= vec_end (em->segments))
return 0;
p = hash_get (em->section_by_start_address, g->header.virtual_address);
if (!p)
return 0;
s = vec_elt_at_index (em->sections, p[0]);
return (char *) vec_dup (s->contents);
}
static void *
elf_get_section_contents_with_starting_address (elf_main_t * em,
uword start_address,
uword elt_size,
u32 * section_index_result)
{
elf_section_t *s = 0;
clib_error_t *error;
error = elf_get_section_by_start_address (em, start_address, &s);
if (error)
{
clib_error_report (error);
return 0;
}
if (section_index_result)
*section_index_result = s->index;
return elf_get_section_contents (em, s->index, elt_size);
}
static void
elf_parse_dynamic (elf_main_t * em)
{
elf_section_t *s;
elf64_dynamic_entry_t *e;
vec_foreach (s, em->sections)
{
switch (s->header.type)
{
case ELF_SECTION_DYNAMIC:
add_dynamic_entries (em, s);
break;
default:
break;
}
}
em->dynamic_string_table_section_index = ~0;
em->dynamic_string_table = 0;
vec_foreach (e, em->dynamic_entries)
{
switch (e->type)
{
case ELF_DYNAMIC_ENTRY_STRING_TABLE:
ASSERT (vec_len (em->dynamic_string_table) == 0);
em->dynamic_string_table
=
elf_get_section_contents_with_starting_address (em, e->data,
sizeof (u8),
&em->
dynamic_string_table_section_index);
break;
case ELF_DYNAMIC_ENTRY_SYMBOL_TABLE:
{
elf_section_t *s = 0;
clib_error_t *error;
error = elf_get_section_by_start_address (em, e->data, &s);
if (error)
{
clib_error_report (error);
return;
}
em->dynamic_symbol_table_section_index = s - em->sections;
}
break;
case ELF_DYNAMIC_ENTRY_VERSYM:
em->versym
=
elf_get_section_contents_with_starting_address (em, e->data,
sizeof (em->versym
[0]),
&em->
versym_section_index);
if (em->need_byte_swap)
{
uword i;
for (i = 0; i < vec_len (em->versym); i++)
em->versym[i] = clib_byte_swap_u16 (em->versym[i]);
}
break;
case ELF_DYNAMIC_ENTRY_VERSION_NEED:
em->verneed
=
elf_get_section_contents_with_starting_address (em, e->data,
sizeof (em->verneed
[0]),
&em->
verneed_section_index);
if (em->need_byte_swap)
byte_swap_verneed (em, em->verneed);
break;
default:
break;
}
}
}
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
__clib_export clib_error_t *
elf_read_file (elf_main_t * em, char *file_name)
{
int fd;
struct stat fd_stat;
uword mmap_length = 0;
void *data = 0;
clib_error_t *error = 0;
elf_main_init (em);
fd = open (file_name, 0);
if (fd < 0)
{
error = clib_error_return_unix (0, "open `%s'", file_name);
goto done;
}
if (fstat (fd, &fd_stat) < 0)
{
error = clib_error_return_unix (0, "fstat `%s'", file_name);
goto done;
}
mmap_length = fd_stat.st_size;
data = mmap (0, mmap_length, PROT_READ, MAP_SHARED, fd, /* offset */ 0);
if (~pointer_to_uword (data) == 0)
{
error = clib_error_return_unix (0, "mmap `%s'", file_name);
goto done;
}
CLIB_MEM_UNPOISON (data, mmap_length);
em->file_name = file_name;
error = elf_parse (em, data, mmap_length);
if (error)
goto done;
elf_parse_symbols (em);
elf_parse_dynamic (em);
em->interpreter = elf_find_interpreter (em, data);
munmap (data, mmap_length);
close (fd);
return /* no error */ 0;
done:
elf_main_free (em);
if (fd >= 0)
close (fd);
if (data)
munmap (data, mmap_length);
return error;
}
typedef struct
{
u8 *new_table;
u8 *old_table;
uword *hash;
} string_table_builder_t;
static u32
string_table_add_name (string_table_builder_t * b, u8 * n)
{
uword *p, i, j, l;
p = hash_get_mem (b->hash, n);
if (p)
return p[0];
l = strlen ((char *) n);
i = vec_len (b->new_table);
vec_add (b->new_table, n, l + 1);
for (j = 0; j <= l; j++)
{
if (j > 0)
{
p = hash_get_mem (b->hash, n + j);
/* Sub-string already in table? */
if (p)
continue;
}
hash_set_mem (b->hash, n + j, i + j);
}
return i;
}
static u32 string_table_add_name_index (string_table_builder_t * b, u32 index)
__attribute__ ((unused));
static u32
string_table_add_name_index (string_table_builder_t * b, u32 index)
{
u8 *n = b->old_table + index;
return string_table_add_name (b, n);
}
static void string_table_init (string_table_builder_t * b, u8 * old_table)
__attribute__ ((unused));
static void
string_table_init (string_table_builder_t * b, u8 * old_table)
{
clib_memset (b, 0, sizeof (b[0]));
b->old_table = old_table;
b->hash = hash_create_string (0, sizeof (uword));
}
static u8 *string_table_done (string_table_builder_t * b)
__attribute__ ((unused));
static u8 *
string_table_done (string_table_builder_t * b)
{
hash_free (b->hash);
return b->new_table;
}
static void
layout_sections (elf_main_t * em)
{
elf_section_t *s;
u32 n_sections_with_changed_exec_address = 0;
u32 *deferred_symbol_and_string_sections = 0;
u32 n_deleted_sections = 0;
/* note: rebuild is always zero. Intent lost in the sands of time */
#if 0
int rebuild = 0;
/* Re-build section string table (sections may have been deleted). */
if (rebuild)
{
u8 *st = 0;
vec_foreach (s, em->sections)
{
u8 *name;
if (s->header.type == ~0)
continue;
name = elf_section_name (em, s);
s->header.name = vec_len (st);
vec_add (st, name, strlen ((char *) name) + 1);
}
s =
vec_elt_at_index (em->sections,
em->file_header.section_header_string_table_index);
vec_free (s->contents);
s->contents = st;
}
/* Re-build dynamic string table. */
if (rebuild && em->dynamic_string_table_section_index != ~0)
{
string_table_builder_t b;
string_table_init (&b, em->dynamic_string_table);
/* Add all dynamic symbols. */
{
elf_symbol_table_t *symtab;
elf64_symbol_t *sym;
symtab =
vec_elt_at_index (em->symbol_tables,
em->dynamic_symbol_table_index);
vec_foreach (sym, symtab->symbols)
{
u8 *name = elf_symbol_name (symtab, sym);
sym->name = string_table_add_name (&b, name);
}
set_symbol_table (em, em->dynamic_symbol_table_index);
}
/* Add all dynamic entries. */
{
elf64_dynamic_entry_t *e;
vec_foreach (e, em->dynamic_entries)
{
switch (e->type)
{
case ELF_DYNAMIC_ENTRY_NEEDED_LIBRARY:
case ELF_DYNAMIC_ENTRY_RPATH:
case ELF_DYNAMIC_ENTRY_RUN_PATH:
e->data = string_table_add_name_index (&b, e->data);
break;
}
}
}
/* Add all version needs. */
if (vec_len (em->verneed) > 0)
{
elf_dynamic_version_need_union_t *n, *a;
n = em->verneed;
while (1)
{
n->need.file_name_offset =
string_table_add_name_index (&b, n->need.file_name_offset);
if (n->need.first_aux_offset != 0)
{
a = n + n->need.first_aux_offset / sizeof (n[0]);
while (1)
{
a->aux.name =
string_table_add_name_index (&b, a->aux.name);
if (a->aux.next_offset == 0)
break;
a += a->aux.next_offset / sizeof (a[0]);
}
}
if (n->need.next_offset == 0)
break;
n += n->need.next_offset / sizeof (n[0]);
}
set_dynamic_verneed (em);
}
s =
vec_elt_at_index (em->sections,
em->dynamic_string_table_section_index);
vec_free (s->contents);
s->contents = string_table_done (&b);
}
#endif /* dead code */
/* Figure file offsets and exec addresses for sections. */
{
u64 exec_address = 0, file_offset = 0;
u64 file_size, align_size;
vec_foreach (s, em->sections)
{
/* Ignore deleted and unused sections. */
switch (s->header.type)
{
case ~0:
n_deleted_sections++;
case ELF_SECTION_UNUSED:
continue;
case ELF_SECTION_STRING_TABLE:
case ELF_SECTION_SYMBOL_TABLE:
if (!(s->index == em->dynamic_string_table_section_index
|| s->index ==
em->file_header.section_header_string_table_index))
{
vec_add1 (deferred_symbol_and_string_sections, s->index);
continue;
}
break;
default:
break;
}
exec_address = round_pow2_u64 (exec_address, s->header.align);
/* Put sections we added at end of file. */
if (s->header.file_offset == ~0)
s->header.file_offset = file_offset;
/* Follow gaps in original file. */
if (s->header.exec_address > exec_address)
{
exec_address = s->header.exec_address;
file_offset = s->header.file_offset;
}
if (s->header.flags & ELF_SECTION_FLAG_ALLOC)
{
s->exec_address_change = exec_address - s->header.exec_address;
n_sections_with_changed_exec_address += s->exec_address_change != 0;
s->header.exec_address = exec_address;
}
if (s->header.type == ELF_SECTION_NO_BITS)
file_size = s->header.file_size;
else
file_size = vec_len (s->contents);
{
u64 align;
if (s + 1 >= vec_end (em->sections))
align = 16;
else if (s[1].header.type == ELF_SECTION_NO_BITS)
align = 8;
else
align = s[1].header.align;
if (s->header.flags & ELF_SECTION_FLAG_ALLOC)
{
u64 v = round_pow2_u64 (exec_address + file_size, align);
align_size = v - exec_address;
}
else
{
u64 v = round_pow2_u64 (file_offset + file_size, align);
align_size = v - file_offset;
}
}
s->header.file_offset = file_offset;
s->header.file_size = file_size;
s->align_size = align_size;
if (s->header.type != ELF_SECTION_NO_BITS)
file_offset += align_size;
exec_address += align_size;
}
/* Section headers go after last section but before symbol/string
tables. */
{
elf64_file_header_t *fh = &em->file_header;
fh->section_header_file_offset = file_offset;
fh->section_header_count = vec_len (em->sections) - n_deleted_sections;
file_offset += (u64) fh->section_header_count * fh->section_header_size;
}
{
int i;
for (i = 0; i < vec_len (deferred_symbol_and_string_sections); i++)
{
s =
vec_elt_at_index (em->sections,
deferred_symbol_and_string_sections[i]);
s->header.file_offset = file_offset;
s->header.file_size = vec_len (s->contents);
align_size = round_pow2 (vec_len (s->contents), 16);
s->align_size = align_size;
file_offset += align_size;
}
vec_free (deferred_symbol_and_string_sections);
}
}
/* Update dynamic entries now that sections have been assigned
possibly new addresses. */
#if 0
if (rebuild)
elf_set_dynamic_entries (em);
#endif
/* Update segments for changed section addresses. */
{
elf_segment_t *g;
uword si;
vec_foreach (g, em->segments)
{
u64 s_lo, s_hi, f_lo = 0;
u32 n_sections = 0;
if (g->header.memory_size == 0)
continue;
s_lo = s_hi = 0;
/* *INDENT-OFF* */
clib_bitmap_foreach (si, g->section_index_bitmap) {
u64 lo, hi;
s = vec_elt_at_index (em->sections, si);
lo = s->header.exec_address;
hi = lo + s->align_size;
if (n_sections == 0)
{
s_lo = lo;
s_hi = hi;
f_lo = s->header.file_offset;
n_sections++;
}
else
{
if (lo < s_lo)
{
s_lo = lo;
f_lo = s->header.file_offset;
}
if (hi > s_hi)
s_hi = hi;
}
}
/* *INDENT-ON* */
if (n_sections == 0)
continue;
/* File offset zero includes ELF headers/segment headers.
Don't change that. */
if (g->header.file_offset == 0 && g->header.type == ELF_SEGMENT_LOAD)
{
s_lo = g->header.virtual_address;
f_lo = g->header.file_offset;
}
g->header.virtual_address = s_lo;
g->header.physical_address = s_lo;
g->header.file_offset = f_lo;
g->header.memory_size = s_hi - s_lo;
}
}
}
__clib_export clib_error_t *
elf_write_file (elf_main_t *em, char *file_name)
{
int fd;
FILE *f;
clib_error_t *error = 0;
fd = open (file_name, O_CREAT | O_RDWR | O_TRUNC, 0755);
if (fd < 0)
return clib_error_return_unix (0, "open `%s'", file_name);
f = fdopen (fd, "w");
/* Section contents may have changed. So, we need to update
stuff to reflect this. */
layout_sections (em);
/* Write first header. */
{
elf_first_header_t h = em->first_header;
elf_swap_first_header (em, &h);
if (fwrite (&h, sizeof (h), 1, f) != 1)
{
error = clib_error_return_unix (0, "write first header");
goto error;
}
}
/* Write file header. */
{
elf64_file_header_t h = em->file_header;
/* Segment headers are after first header. */
h.segment_header_file_offset = sizeof (elf_first_header_t);
if (em->first_header.file_class == ELF_64BIT)
h.segment_header_file_offset += sizeof (elf64_file_header_t);
else
h.segment_header_file_offset += sizeof (elf32_file_header_t);
if (em->first_header.file_class == ELF_64BIT)
{
#define _(t,field) h.field = elf_swap_##t (em, h.field);
foreach_elf64_file_header;
#undef _
if (fwrite (&h, sizeof (h), 1, f) != 1)
{
error = clib_error_return_unix (0, "write file header");
goto error;
}
}
else
{
elf32_file_header_t h32;
#define _(t,field) h32.field = elf_swap_##t (em, h.field);
foreach_elf32_file_header;
#undef _
if (fwrite (&h32, sizeof (h32), 1, f) != 1)
{
error = clib_error_return_unix (0, "write file header");
goto error;
}
}
}
/* Write segment headers. */
{
elf_segment_t *s;
vec_foreach (s, em->segments)
{
elf64_segment_header_t h;
if (s->header.type == ~0)
continue;
h = s->header;
if (em->first_header.file_class == ELF_64BIT)
{
#define _(t,field) h.field = elf_swap_##t (em, h.field);
foreach_elf64_segment_header;
#undef _
if (fwrite (&h, sizeof (h), 1, f) != 1)
{
error =
clib_error_return_unix (0, "write segment header %U",
format_elf_segment, em, s);
goto error;
}
}
else
{
elf32_segment_header_t h32;
#define _(t,field) h32.field = elf_swap_##t (em, h.field);
foreach_elf32_segment_header;
#undef _
if (fwrite (&h32, sizeof (h32), 1, f) != 1)
{
error =
clib_error_return_unix (0, "write segment header %U",
format_elf_segment, em, s);
goto error;
}
}
}
}
/* Write contents for all sections. */
{
elf_section_t *s;
vec_foreach (s, em->sections)
{
if (s->header.file_size == 0)
continue;
if (fseek (f, s->header.file_offset, SEEK_SET) < 0)
{
fclose (f);
return clib_error_return_unix (0, "fseek 0x%Lx",
s->header.file_offset);
}
if (s->header.type == ELF_SECTION_NO_BITS)
/* don't write for .bss sections */ ;
else if (fwrite (s->contents, vec_len (s->contents), 1, f) != 1)
{
error =
clib_error_return_unix (0, "write %s section contents",
elf_section_name (em, s));
goto error;
}
}
/* Finally write section headers. */
if (fseek (f, em->file_header.section_header_file_offset, SEEK_SET) < 0)
{
fclose (f);
return clib_error_return_unix
(0, "fseek 0x%Lx", em->file_header.section_header_file_offset);
}
vec_foreach (s, em->sections)
{
elf64_section_header_t h;
if (s->header.type == ~0)
continue;
h = s->header;
if (em->first_header.file_class == ELF_64BIT)
{
#define _(t,field) h.field = elf_swap_##t (em, h.field);
foreach_elf64_section_header;
#undef _
if (fwrite (&h, sizeof (h), 1, f) != 1)
{
error =
clib_error_return_unix (0, "write %s section header",
elf_section_name (em, s));
goto error;
}
}
else
{
elf32_section_header_t h32;
#define _(t,field) h32.field = elf_swap_##t (em, h.field);
foreach_elf32_section_header;
#undef _
if (fwrite (&h32, sizeof (h32), 1, f) != 1)
{
error =
clib_error_return_unix (0, "write %s section header",
elf_section_name (em, s));
goto error;
}
}
}
}
error:
fclose (f);
return error;
}
clib_error_t *
elf_delete_named_section (elf_main_t * em, char *section_name)
{
elf_section_t *s = 0;
clib_error_t *error;
error = elf_get_section_by_name (em, section_name, &s);
if (error)
return error;
s->header.type = ~0;
return 0;
}
void
elf_create_section_with_contents (elf_main_t * em,
char *section_name,
elf64_section_header_t * header,
void *contents, uword n_content_bytes)
{
elf_section_t *s, *sts;
u8 *st, *c;
uword *p, is_new_section;
/* See if section already exists with given name.
If so, just replace contents. */
is_new_section = 0;
if ((p = hash_get_mem (em->section_by_name, section_name)))
{
s = vec_elt_at_index (em->sections, p[0]);
_vec_len (s->contents) = 0;
c = s->contents;
}
else
{
vec_add2 (em->sections, s, 1);
is_new_section = 1;
c = 0;
}
sts =
vec_elt_at_index (em->sections,
em->file_header.section_header_string_table_index);
st = sts->contents;
s->header = header[0];
s->header.file_offset = ~0;
s->header.file_size = n_content_bytes;
s->index = s - em->sections;
/* Add name to string table. */
s->header.name = vec_len (st);
vec_add (st, section_name, strlen (section_name));
vec_add1 (st, 0);
sts->contents = st;
vec_resize (c, n_content_bytes);
clib_memcpy (c, contents, n_content_bytes);
s->contents = c;
em->file_header.section_header_count += is_new_section
&& s->header.type != ~0;
}
uword
elf_delete_segment_with_type (elf_main_t * em,
elf_segment_type_t segment_type)
{
uword n_deleted = 0;
elf_segment_t *s;
vec_foreach (s, em->segments) if (s->header.type == segment_type)
{
s->header.type = ~0;
n_deleted += 1;
}
ASSERT (em->file_header.segment_header_count >= n_deleted);
em->file_header.segment_header_count -= n_deleted;
return n_deleted;
}
#endif /* CLIB_UNIX */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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