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General Programming Concepts: Writing and Debugging Programs
An object file's section header table lets one locate all the
file's sections. The section header table is an array of
Elf32_Shdr or Elf64_Shdr structures as described
below. A section header table index is a subscript into this
array. The ELF header's e_shoff member gives the byte
offset from the beginning of the file to the section header table.
e_shnum tells how many entries the section header table
contains. e_shentsize gives the size in bytes of each
entry.
If the number of sections is greater than or equal to SHN_LORESERVE
(0xff00), e_shnum has the value SHN_UNDEF (0) and the actual number
of section header table entries is contained in the sh_size field of the
section header at index 0 (otherwise, the sh_size member of the
initial entry contains 0).
Some section header table indexes are reserved in contexts where index size
is restricted, for example, the st_shndx member of a symbol table
entry and the e_shnum and e_shstrndx members of the ELF
header. In such contexts, the reserved values do not represent actual
sections in the object file. Also in such contexts, an escape value
indicates that the actual section index is to be found elsewhere, in a larger
field.
Special Section Indexes
Name
| Value
|
SHN_UNDEF
| 0
|
SHN_LORESERVE
| 0xff00
|
SHN_LOPROC
| 0xff00
|
SHN_HIPROC
| 0xff1f
|
SHN_LOOS
| 0xff20
|
SHN_HIOS
| 0xff3f
|
SHN_ABS
| 0xfff1
|
SHN_COMMON
| 0xfff2
|
SHN_HIRESERVE
| 0xffff
|
- SHN_UNDEF
- This value marks an undefined, missing, irrelevant, or otherwise
meaningless section reference. For example, a symbol defined relative
to section number SHN_UNDEF is an undefined symbol.
NOTE: Although index 0 is reserved as the undefined value,
the section header table contains an entry for index 0. If the e_shnum
member of the ELF header says a file has 6 entries in the section header
table, they have the indexes 0 through 5. The contents of the initial
entry are specified later in this section.
- SHN_LORESERVE
- This value specifies the lower bound of the range of reserved
indexes.
- SHN_LOPROC through SHN_HIPROC
- Values in this inclusive range are reserved for processor-specific
semantics.
- SHN_LOOS through SHN_HIOS
- Values in this inclusive range are reserved for operating system-specific
semantics.
- SHN_ABS
- This value specifies absolute values for the corresponding
reference. For example, symbols defined relative to section number
equals SHN_ABS have absolute values and are not affected by
relocation.
- SHN_COMMON
- Symbols defined relative to this section are common symbols, such as
FORTRAN COMMON or unallocated C external variables.
- SHN_HIRESERVE
- This value specifies the upper bound of the range of reserved
indexes. The system reserves indexes between SHN_LORESERVE
and SHN_HIRESERVE, inclusive; the values do not reference the
section header table. The section header table does not contain entries
for the reserved indexes.
Sections contain all information in an object file except the ELF header,
the program header table, and the section header table. Moreover,
object files' sections satisfy several conditions.
- Every section in an object file has exactly one section header describing
it. Section headers may exist that do not have a section.
- Each section occupies one contiguous (possibly empty) sequence of bytes
within a file.
- Sections in a file may not overlap. No byte in a file resides in
more than one section.
- An object file may have inactive space. The various headers and the
sections might not cover every byte in an object file. The contents of
the inactive data are unspecified.
A section header has the following structure.
typedef struct {
Elf32_Word sh_name;
Elf32_Word sh_type;
Elf32_Word sh_flags;
Elf32_Addr sh_addr;
Elf32_Off sh_offset;
Elf32_Word sh_size;
Elf32_Word sh_link;
Elf32_Word sh_info;
Elf32_Word sh_addralign;
Elf32_Word sh_entsize;
} Elf32_Shdr;
typedef struct {
Elf64_Word sh_name;
Elf64_Word sh_type;
Elf64_Xword sh_flags;
Elf64_Addr sh_addr;
Elf64_Off sh_offset;
Elf64_Xword sh_size;
Elf64_Word sh_link;
Elf64_Word sh_info;
Elf64_Xword sh_addralign;
Elf64_Xword sh_entsize;
} Elf64_Shdr;
|
Section Header
- sh_name
- This member specifies the name of the section. Its value is an
index into the section header string table section [see String Table below], giving the location of a null-terminated
string.
- sh_type
- This member categorizes the section's contents and semantics.
Section types and their descriptions appear below.
- sh_flags
- Sections support 1-bit flags that describe miscellaneous
attributes. Flag definitions appear below.
- sh_addr
- If the section will appear in the memory image of a process, this member
gives the address at which the section's first byte should reside.
Otherwise, the member contains 0.
- sh_offset
- This member's value gives the byte offset from the beginning of the
file to the first byte in the section. One section type,
SHT_NOBITS described below, occupies no space
in the file, and its sh_offset member locates the conceptual
placement in the file.
- sh_size
- This member gives the section's size in bytes. Unless the
section type is SHT_NOBITS, the section occupies sh_size
bytes in the file. A section of type SHT_NOBITS may have a
non-zero size, but it occupies no space in the file.
- sh_link
- This member holds a section header table index link, whose interpretation
depends on the section type. A table below
describes the values.
- sh_info
- This member holds extra information, whose interpretation depends on the
section type. A table below describes the
values. If the sh_flags field for this section header
includes the attribute SHF_INFO_LINK, then this
member represents a section header table index.
- sh_addralign
- Some sections have address alignment constraints. For example, if a
section holds a doubleword, the system must ensure doubleword alignment for
the entire section. The value of sh_addr must be congruent
to 0, modulo the value of sh_addralign. Currently, only 0
and positive integral powers of two are allowed. Values 0 and 1 mean
the section has no alignment constraints.
- sh_entsize
- Some sections hold a table of fixed-size entries, such as a symbol
table. For such a section, this member gives the size in bytes of each
entry. The member contains 0 if the section does not hold a table of
fixed-size entries.
A section header's sh_type member specifies the
section's semantics.
Section
Types,sh_type
Name
| Value
|
SHT_NULL
| 0
|
SHT_PROGBITS
| 1
|
SHT_SYMTAB
| 2
|
SHT_STRTAB
| 3
|
SHT_RELA
| 4
|
SHT_HASH
| 5
|
SHT_DYNAMIC
| 6
|
SHT_NOTE
| 7
|
SHT_NOBITS
| 8
|
SHT_REL
| 9
|
SHT_SHLIB
| 10
|
SHT_DYNSYM
| 11
|
SHT_INIT_ARRAY
| 14
|
SHT_FINI_ARRAY
| 15
|
SHT_PREINIT_ARRAY
| 16
|
SHT_LOOS
| 0x60000000
|
SHT_HIOS
| 0x6fffffff
|
SHT_LOPROC
| 0x70000000
|
SHT_HIPROC
| 0x7fffffff
|
SHT_LOUSER
| 0x80000000
|
SHT_HIUSER
| 0xffffffff
|
- SHT_NULL
- This value marks the section header as inactive; it does not have an
associated section. Other members of the section header have undefined
values.
- SHT_PROGBITS
- The section holds information defined by the program, whose format and
meaning are determined solely by the program.
- SHT_SYMTAB and SHT_DYNSYM
- These sections hold a symbol table. Currently, an object file may
have only one section of each type, but this restriction may be relaxed in the
future. Typically, SHT_SYMTAB provides symbols for link
editing, though it may also be used for dynamic linking. As a complete
symbol table, it may contain many symbols unnecessary for dynamic
linking. Consequently, an object file may also contain a
SHT_DYNSYM section, which holds a minimal set of dynamic linking
symbols, to save space. See the Symbol Table for details.
- SHT_STRTAB
- The section holds a string table. An object file may have multiple
string table sections. See the String Table for details.
- SHT_RELA
- The section holds relocation entries with explicit addends, such as type
Elf32_Rela for the 32-bit class of object files or type
Elf64_Rela for the 64-bit class of object files. An object
file may have multiple relocation sections. See Relocation for details.
- SHT_HASH
- The section holds a symbol hash table. Currently, an object file
may have only one hash table, but this restriction may be relaxed in the
future. See the Hash Table in Chapter 32 for details.
- SHT_DYNAMIC
- The section holds information for dynamic linking. Currently, an
object file may have only one dynamic section, but this restriction may be
relaxed in the future. See Dynamic Section in chapter 32 for details.
- SHT_NOTE
- The section holds information that marks the file in some way. See Note Section in Chapter 32 for details.
- SHT_NOBITS
- A section of this type occupies no space in the file but otherwise
resembles SHT_PROGBITS. Although this section contains no
bytes, the sh_offset member contains the conceptual file
offset.
- SHT_REL
- The section holds relocation entries without explicit addends, such as
type Elf32_Rel for the 32-bit class of object files or type
Elf64_Rel for the 64-bit class of object files. An object
file may have multiple relocation sections. See Relocation for details.
- SHT_SHLIB
- This section type is reserved but has unspecified semantics.
- SHT_INIT_ARRAY
- This section contains an array of pointers to initialization functions, as
described in Initialization and Termination Functions in Chapter 32. Each pointer in the array is taken as
a parameterless procedure with a void return.
- SHT_FINI_ARRAY
- This section contains an array of pointers to termination functions, as
described in Initialization and Termination Functions in chapter 32. Each pointer in the array is taken as
a parameterless procedure with a void return.
- SHT_PREINIT_ARRAY
- This section contains an array of pointers to functions that are invoked
before all other initialization functions, as described in Initialization and Termination Functions in Chapter 32. Each pointer in the array is taken as
a parameterless procedure with a void return.
- SHT_LOOS through SHT_HIOS
- Values in this inclusive range are reserved for operating system-specific
semantics.
- SHT_LOPROC through SHT_HIPROC
- Values in this inclusive range are reserved for processor-specific
semantics.
- SHT_LOUSER
- This value specifies the lower bound of the range of indexes reserved for
application programs.
- SHT_HIUSER
- This value specifies the upper bound of the range of indexes reserved for
application programs. Section types between SHT_LOUSER and
SHT_HIUSER may be used by the application, without conflicting with
current or future system-defined section types.
Other section type values are reserved. As mentioned before, the
section header for index 0 (SHN_UNDEF) exists, even though the
index marks undefined section references. This entry holds the
following.
Section Header Table Entry:Index 0
Name
| Value
| Note
|
sh_name
| 0
| No name
|
sh_type
| SHT_NULL
| Inactive
|
sh_flags
| 0
| No flags
|
sh_addr
| 0
| No address
|
sh_offset
| 0
| No offset
|
sh_size
| Unspecified
| If non-zero, the actual number of section header entries
|
sh_link
| Unspecified
| If non-zero, the index of the section header string table section
|
sh_info
| 0
| No auxiliary information
|
sh_addralign
| 0
| No alignment
|
sh_entsize
| 0
| No entries
|
A section header's sh_flags member holds 1-bit flags that
describe the section's attributes. Defined values appear in the
following table; other values are reserved.
Section Attribute Flags
Name
| Value
|
SHF_WRITE
| 0x1
|
SHF_ALLOC
| 0x2
|
SHF_EXECINSTR
| 0x4
|
SHF_MERGE
| 0x10
|
SHF_STRINGS
| 0x20
|
SHF_INFO_LINK
| 0x40
|
SHF_LINK_ORDER
| 0x80
|
SHF_OS_NONCONFORMING
| 0x100
|
SHF_GROUP
| 0x200
|
SHF_MASKOS
| 0x0ff00000
|
SHF_MASKPROC
| 0xf0000000
|
If a flag bit is set in sh_flags, the attribute is on for the
section. Otherwise, the attribute is off or does not apply.
Undefined attributes are set to zero.
- SHF_WRITE
- The section contains data that should be writable during process
execution.
- SHF_ALLOC
- The section occupies memory during process execution. Some control
sections do not reside in the memory image of an object file; this
attribute is off for those sections.
- SHF_EXECINSTR
- The section contains executable machine instructions.
- SHF_MERGE
- The data in the section may be merged to eliminate duplication.
Unless the SHF_STRINGS flag is also set, the data elements in the
section are of a uniform size. The size of each element is specified in
the section header's sh_entsize field. If the
SHF_STRINGS flag is also set, the data elements consist of
null-terminated character strings. The size of each character is
specified in the section header's sh_entsize field.
Each element in the section is compared against other elements in sections
with the same name, type and flags. Elements that would have identical
values at program run-time may be merged. Relocations referencing
elements of such sections must be resolved to the merged locations of the
referenced values. Note that any relocatable values, including values
that would result in run-time relocations, must be analyzed to determine
whether the run-time values would actually be identical. An
ABI-conforming object file may not depend on specific elements being merged,
and an ABI-conforming link editor may choose not to merge specific
elements.
- SHF_STRINGS
- The data elements in the section consist of null-terminated character
strings. The size of each character is specified in the section
header's sh_entsize field.
- SHF_INFO_LINK
- The sh_info field of this section header holds a section header
table index.
- SHF_LINK_ORDER
- This flag adds special ordering requirements for link editors. The
requirements apply if the sh_link field of this section's
header references another section (the linked-to section). If this
section is combined with other sections in the output file, it must appear in
the same relative order with respect to those sections, as the linked-to
section appears with respect to sections the linked-to section is combined
with.
NOTE: A typical use of this flag is to build a table that
references text or data sections in address order.
- SHF_OS_NONCONFORMING
- This section requires special operating system specific processing (beyond
the standard linking rules (Rules for Linking Unrecognized Sections) to avoid incorrect behavior. If this section has
either an sh_type value or contains sh_flags bits in the
OS-specific ranges for those fields, and a link editor processing this section
does not recognize those values, then the link editor should reject the object
file containing this section with an error.
- SHF_MASKOS
- All bits included in this mask are reserved for operating system-specific
semantics.
- SHF_MASKPROC
- All bits included in this mask are reserved for processor-specific
semantics. If meanings are specified, the processor supplement explains
them.
Two members in the section header, sh_link and
sh_info, hold special information, depending on section
type.
sh_link and
sh_info Interpretation
sh_type
| sh_link
| sh_info
|
SHT_DYNAMIC
| The section header index of the string table used by entries in the
section.
| 0
|
SHT_HASH
| The section header index of the symbol table to which the hash table
applies.
| 0
|
SHT_REL
SHT_RELA
| The section header index of the associated symbol table.
| The section header index of the section to which the relocation
applies.
|
SHT_SYMTAB
SHT_DYNSYM
| The section header index of the associated string table.
| One greater than the symbol table index of the last local symbol (binding
STB_LOCAL).
|
SHT_GROUP
| The section header index of the associated symbol table.
| The symbol table index of an entry in the associated symbol table.
The name of the specified symbol table entry provides a signature for the
section group.
|
SHT_SYMTAB_SHNDX
| The section header index of the associated symbol table section.
| 0
|
If a link editor encounters sections whose headers contain operating system
specific values it does not recognize in the sh_type or
sh_flags fields, the link editor should combine those sections as
described below.
If the section's sh_flags bits include the attribute
SHF_OS_NONCONFORMING, then the section requires special knowledge
to be correctly processed, and the link editor should reject the object
containing the section with an error.
Unrecognized sections that do not have the SHF_OS_NONCONFORMING
attribute, are combined in a two-phase process. As the link editor
combines sections using this process, it must honor the alignment constraints
of the input sections (asserted by the sh_addralign field), padding
between sections with zero bytes, if necessary, and producing a combination
with the maximum alignment constraint of its component input sections.
- In the first phase, input sections that match in name, type and attribute
flags should be concatenated into single sections. The concatenation
order should satisfy the requirements of any known input section attributes
(e.g, SHF_MERGE and SHF_LINK_ORDER). When
not otherwise constrained, sections should be emitted in input order.
- In the second phase, sections should be assigned to segments or other
units based on their attribute flags. Sections of each particular
unrecognized type should be assigned to the same unit unless prevented by
incompatible flags, and within a unit, sections of the same unrecognized type
should be placed together if possible.
Non operating system specific processing (e.g. relocation)
should be applied to unrecognized section types. An output section
header table, if present, should contain entries for unknown sections.
Any unrecognized section attribute flags should be removed.
NOTE: It is recommended that link editors follow the same
two-phase ordering approach described above when linking sections of known
types. Padding between such sections may have values different from
zero, where appropriate.
Some sections occur in interrelated groups. For example, an
out-of-line definition of an inline function might require, in addition to the
section containing its executable instructions, a read-only data section
containing literals referenced, one or more debugging information sections and
other informational sections. Furthermore, there may be internal
references among these sections that would not make sense if one of the
sections were removed or replaced by a duplicate from another object.
Therefore, such groups must be included or omitted from the linked object as a
unit.
A section of type SHT_GROUP defines such a grouping of sections. The
name of a symbol from one of the containing object's symbol tables
provides a signature for the section group. The section header of the
SHT_GROUP section specifies the identifying symbol entry, as described
above: the sh_link member contains the section header index of the
symbol table section that contains the entry. The sh_info member
contains the symbol table index of the identifying entry. The sh_flags
member of the section header contains 0. The name of the section
(sh_name) is not specified.
The section data of a SHT_GROUP section is an array of Elf32_Word
entries. The first entry is a flag word. The remaining entries
are a sequence of section header indices.
The following flags are currently defined:
Section Group Flags
Name
| Value
|
GRP_COMDAT
| 0x1
|
- GRP_COMDAT
- This is a COMDAT group. It may duplicate another COMDAT group in
another object file, where duplication is defined as having the same group
signature. In such cases, only one of the duplicate groups may be
retained by the linker, and the members of the remaining groups must be
discarded.
The section header indices in the SHT_GROUP section identify the sections
that make up the group. Each such section must have the SHF_GROUP flag
set in its sh_flags section header member. If the linker decides to
remove the section group, it must remove all members of the group.
Note: This requirement is not intended to imply that
special case behavior like removing debugging information requires removing
the sections to which that information refers, even if they are part of the
same group.
To facilitate removing a group without leaving dangling references and with
only minimal processing of the symbol table, the following rules must be
followed:
- References to the sections comprising a group from sections outside of the
group must be made via symbol table entries with STB_GLOBAL or STB_WEAK
binding and section index SHN_UNDEF. If there is a definition of the
same symbol in the object containing the references, it must have a separate
symbol table entry from the references. Sections outside of the group
may not reference symbols with STB_LOCAL binding for addresses contained in
the group's sections, including symbols with type STT_SECTION.
- There may not be non-symbol references to the sections comprising a group
from outside the group, for example, use of a group member's section
header index in an sh_link or sh_info member.
- A symbol table entry that is defined relative to one of the group's
sections and that is contained in a symbol table section that is not part of
the group, must be removed if the group members are discarded.
Various sections hold program and control information.
The following table shows sections that are used by the system and have the
indicated types and attributes.
Special Sections
Name
| Type
| Attributes
|
.bss
| SHT_NOBITS
| SHF_ALLOC+SHF_WRITE
|
.comment
| SHT_PROGBITS
| none
|
.data
| SHT_PROGBITS
| SHF_ALLOC+SHF_WRITE
|
.data1
| SHT_PROGBITS
| SHF_ALLOC+SHF_WRITE
|
.debug
| SHT_PROGBITS
| none
|
.dynamic
| SHT_DYNAMIC
| see below
|
.dynstr
| SHT_STRTAB
| SHF_ALLOC
|
.dynsym
| SHT_DYNSYM
| SHF_ALLOC
|
.fini
| SHT_PROGBITS
| SHF_ALLOC+SHF_EXECINSTR
|
.fini_array
| SHT_FINI_ARRAY
| SHF_ALLOC+SHF_WRITE
|
.got
| SHT_PROGBITS
| see below
|
.hash
| SHT_HASH
| SHF_ALLOC
|
.init
| SHT_PROGBITS
| SHF_ALLOC+SHF_EXECINSTR
|
.init_array
| SHT_INIT_ARRAY
| SHF_ALLOC+SHF_WRITE
|
.interp
| SHT_PROGBITS
| see below
|
.line
| SHT_PROGBITS
| none
|
.note
| SHT_NOTE
| none
|
.plt
| SHT_PROGBITS
| see below
|
.preinit_array
| SHT_PREINIT_ARRAY
| SHF_ALLOC+SHF_WRITE
|
.relname
| SHT_REL
| see below
|
.relaname
| SHT_RELA
| see below
|
.rodata
| SHT_PROGBITS
| SHF_ALLOC
|
.rodata1
| SHT_PROGBITS
| SHF_ALLOC
|
.shstrtab
| SHT_STRTAB
| none
|
.strtab
| SHT_STRTAB
| see below
|
.symtab
| SHT_SYMTAB
| see below
|
.text
| SHT_PROGBITS
| SHF_ALLOC+SHF_EXECINSTR
|
- .bss
- This section holds uninitialized data that contribute to the
program's memory image. By definition, the system initializes the
data with zeros when the program begins to run. The section occupies no
file space, as indicated by the section type, SHT_NOBITS.
- .comment
- This section holds version control information.
- .data and .data1
- These sections hold initialized data that contribute to the program's
memory image.
- .debug
- This section holds information for symbolic debugging. The contents
are unspecified. All section names with the prefix
.debug are reserved for future use in the ABI.
- .dynamic
- This section holds dynamic linking information. The section's
attributes will include the SHF_ALLOC bit. Whether the
SHF_WRITE bit is set is processor specific. See chapter 32
for more information.
- .dynstr
- This section holds strings needed for dynamic linking, most commonly the
strings that represent the names associated with symbol table entries.
See chapter 32 for more information.
- .dynsym
- This section holds the dynamic linking symbol table, as described in Symbol Table. See Chapter 32 for more information.
- .fini
- This section holds executable instructions that contribute to the process
termination code. That is, when a program exits normally, the system
arranges to execute the code in this section.
- .fini_array
- This section holds an array of function pointers that contributes to a
single termination array for the executable or shared object containing the
section.
- .got
- This section holds the global offset table. See Coding Examples in
chapter 32, Special Sections in chapter 32, and Global Offset Table in chapter
32 of the processor supplement for more information.
- .hash
- This section holds a symbol hash table. See Hash Table in chapter 32 for more information.
- .init
- This section holds executable instructions that contribute to the process
initialization code. When a program starts to run, the system arranges
to execute the code in this section before calling the main program entry
point (called main for C programs).
- .init_array
- This section holds an array of function pointers that contributes to a
single initialization array for the executable or shared object containing the
section.
- .interp
- This section holds the path name of a program interpreter. If the
file has a loadable segment that includes relocation, the sections'
attributes will include the SHF_ALLOC bit; otherwise, that bit
will be off. See chapter 32 for more information.
- .line
- This section holds line number information for symbolic debugging, which
describes the correspondence between the source program and the machine
code. The contents are unspecified.
- .note
- This section holds information in the format that Chapter 32
describes. See Note Section.
- .plt
- This section holds the procedure linkage table. See "Special
Sections" in Chapter 32 and the "Procedure Linkage Table" in chapter 32 of the
processor supplement for more information.
- .preinit_array
- This section holds an array of function pointers that contributes to a
single pre-initialization array for the executable or shared object containing
the section.
- .relname and .relaname
- These sections hold relocation information, as described in Relocation. If the file has a loadable segment that includes
relocation, the sections' attributes will include the
SHF_ALLOC bit; otherwise, that bit will be off.
Conventionally, name is supplied by the section to which the
relocations apply. Thus a relocation section for
.text normally would have the name
.rel.text or
.rela.text.
- .rodata and .rodata1
- These sections hold read-only data that typically contribute to a
non-writable segment in the process image. See Program Header in Chapter 32 for more information.
- .shstrtab
- This section holds section names.
- .strtab
- This section holds strings, most commonly the strings that represent the
names associated with symbol table entries. If the file has a loadable
segment that includes the symbol string table, the section's attributes
will include the SHF_ALLOC bit; otherwise, that bit will be
off.
- .symtab
- This section holds a symbol table, as Symbol Table in this chapter describes. If the file has a loadable
segment that includes the symbol table, the section's attributes will
include the SHF_ALLOC bit; otherwise, that bit will be
off.
- .text
- This section holds the text, or executable instructions, of a
program.
Section names with a dot (.) prefix are reserved for the
system, although applications may use these sections if their existing
meanings are satisfactory. Applications may use names without the
prefix to avoid conflicts with system sections. The object file format
lets one define sections not shown in the previous list. An object file
may have more than one section with the same name.
Section names reserved for a processor architecture are formed by placing
an abbreviation of the architecture name ahead of the section name. The
name should be taken from the architecture names used for
e_machine. For instance
.FOO.psect is the psect section
defined by the FOO architecture.
Existing extensions are called by their historical names.
Table 32-1.
Pre-existing Extensions
.sdata
| .tdesc
|
.sbss
| .lit4
|
.lit8
| .reginfo
|
.gptab
| .liblist
|
.conflict
|
NOTE: For information on processor-specific sections, see
the ABI supplement for the desired processor.
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