CN107193604A - Embedded system loads method, storage medium and the terminal of symbol table - Google Patents
Embedded system loads method, storage medium and the terminal of symbol table Download PDFInfo
- Publication number
- CN107193604A CN107193604A CN201710381067.8A CN201710381067A CN107193604A CN 107193604 A CN107193604 A CN 107193604A CN 201710381067 A CN201710381067 A CN 201710381067A CN 107193604 A CN107193604 A CN 107193604A
- Authority
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- China
- Prior art keywords
- symbol table
- file
- identifying code
- symbol
- embedded system
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/445—Program loading or initiating
- G06F9/44521—Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/40—Transformation of program code
- G06F8/41—Compilation
- G06F8/43—Checking; Contextual analysis
- G06F8/433—Dependency analysis; Data or control flow analysis
Abstract
The invention discloses method, storage medium and the terminal that a kind of embedded system loads symbol table, methods described includes：When receiving program debugging instruction, the symbol table file being pre-stored in ROM is read, wherein, the symbol table file includes identifying code and version information；The identifying code that the symbol table file is carried is obtained, and the identifying code is verified；When the authentication succeeds, by symbol table loading interface by the symbol table file import system, and debugging is started.In the present invention, symbol table file is saved in embedded system ROM, and target mirror is as file default is without symbol table, when system is normally run, symbol table not memory-resident, and when need shell to debug, then symbol table in ROM is read out and be loaded into internal memory；So then both allowed symbol table to play effect, memory source is saved again.
Description
Technical field
The present invention relates to field of computer technology, more particularly to a kind of method of embedded system loading symbol table, storage
Medium and terminal.
Background technology
In computer science, symbol table is a kind of data being used in language translator (such as compiler and interpreter)
Structure.In symbol table, statement or use information of each identifier with it in program source code are bound together, such as
Its data type, action scope and memory address.Symbol table compiler work during need constantly collection, record and
The relevant informations such as type and feature using some grammatical symbols in source program.These information are typically stored in a tabular form is
In system.Such as constant table, variable famous-brand clock, array name table, process famous-brand clock, label table, are referred to as symbol table.For symbol table group
Knit, construct and management method quality can directly affect the operational efficiency of compiling system.
Symbol table is the function name included in whole image file, the set of global variable title.Using symbol table,
Function name can be directly inputted below shell and carries out function call, name variable read-write global variable can also be directly inputted,
Quite facilitate code debugging.Symbol table is compiled into image file by management symbol table in the prior art, and takes several million to several
Ten Mbytes of memory source.So image file is needed compared with imperial palace, and then cause program to take larger internal memory, influence system
The operational efficiency of system.
Thus prior art could be improved and improve.
The content of the invention
The technical problem to be solved in the present invention is that there is provided a kind of loading of embedded system in view of the shortcomings of the prior art
Method, storage medium and the terminal of symbol table, with solve existing embedded system symbol table is stored in it is in image file and temporary
The problem of using internal memory.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is as follows：
A kind of method that embedded system loads symbol table, it includes：
When receiving program debugging instruction, the symbol table file being pre-stored in ROM is read, wherein, the symbol table file is included
Identifying code and version information；
The identifying code that the symbol table file is carried is obtained, and the identifying code is verified；
When the authentication succeeds, by symbol table loading interface by the symbol table file import system, and debugging is started.
The method that the embedded system loads symbol table, wherein, described when receiving program debugging instruction, reading prestores
In the symbol table file in ROM, wherein, the symbol table file includes before including identifying code and version information file：
Pre-establish symbol table file, and by the ROM of the symbol table file embedded system, wherein, the symbol table file
Include the version information of symbol table, identifying code and system.
The method that the embedded system loads symbol table, wherein, it is described to pre-establish symbol table file, and by the symbol
In the ROM of number list file embedded system, wherein, version of the symbol table file comprising symbol table, identifying code and system is believed
Breath is specifically included：
Compiling in advance does not carry the image file of symbol table, and compiles symbol table according to the image file；
The version information of the system is obtained, and its corresponding identifying code is generated according to the symbol table；
The identifying code and version information are placed in the symbol table front end, to generate the symbol table file.
The method that the embedded system loads symbol table, wherein, the identifying code is all bytes in the symbol table
Binary numeral sum.
The method that the embedded system loads symbol table, wherein, it is described to obtain the checking that the symbol table file is carried
Code, and identifying code progress checking is specifically included：
The Magic number of the symbol table file is read, and judges whether the Magic number is equal to preset characters；
If equal, the sum of the binary numeral of all bytes in the symbol table is calculated, to obtain the first identifying code；
The identifying code is compared with first identifying code, to be verified to the identifying code.
The method that the embedded system loads symbol table, wherein, it is described when the authentication succeeds, connect by symbol table loading
Mouthful by the symbol table import system, and start debugging and specifically include：
When the authentication succeeds, the version information that the identifying code is carried is obtained, and by the version information and the current version of system
This information is compared；
When version information is consistent, by symbol table loading interface by the symbol table import system, and start debugging.
The method that the embedded system loads symbol table, wherein, described when receiving program debugging instruction, reading prestores
In the symbol table file in ROM, wherein, the symbol table file is specially comprising identifying code and version information：
When receiving program debugging instruction, the symbol table file is read from ROM predeterminated position, wherein, the predeterminated position
At 1M skews.
The method that the embedded system loads symbol table, wherein, the symbol table be used for stored symbols designation,
Mapping relations between symbolic address and symbol lengths, the symbol is used to describe the letter in the embedded system image file
Number, variable and pretreatment information.
A kind of storage medium, its a plurality of instruction that is stored with, the instruction is suitable to be loaded by processor and performed as above any
The method that the embedded system loads symbol table.
A kind of terminal, it includes：
Processor, is adapted for carrying out each instruction；And
Storage device, suitable for storing a plurality of instruction, the instruction is suitable to be loaded by processor and perform as above any insertion
The method of formula system loads symbol table.
Beneficial effect：Compared with prior art, load the method for symbol table the invention provides a kind of embedded system, deposit
Storage media and terminal, methods described include：When receiving program debugging instruction, the symbol table file being pre-stored in ROM is read, its
In, the symbol table file includes identifying code and version information；The identifying code that the symbol table file is carried is obtained, and to institute
Identifying code is stated to be verified；When the authentication succeeds, by symbol table loading interface by the symbol table file import system, and open
Begin to debug.In the present invention, symbol table file is saved in embedded system ROM, and target mirror is as file default not tape symbol
Table, when system is normally run, symbol table not memory-resident, and when need shell to debug, then read symbol table in ROM
Come and be loaded into internal memory；So then both allowed symbol table to play effect, memory source is saved again.
Brief description of the drawings
The flow chart of the method preferred embodiment for the embedded system loading symbol table that Fig. 1 provides for the present invention.
The data structure diagram of symbol table file in the method for the embedded system loading symbol table that Fig. 2 provides for the present invention.
The structure principle chart for the terminal that Fig. 3 provides for the present invention.
Embodiment
The present invention provides method, storage medium and the terminal that a kind of embedded system loads symbol table, to make the present invention's
Purpose, technical scheme and effect are clearer, clear and definite, the embodiment that develops simultaneously referring to the drawings to the present invention further specifically
It is bright.It should be appreciated that specific embodiment described herein is not intended to limit the present invention only to explain the present invention.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " one " used herein, " one
It is individual ", " described " and "the" may also comprise plural form.It is to be further understood that what is used in the specification of the present invention arranges
Diction " comprising " refer to there is the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
Part is " connected " or during " coupled " to another element, and it can be directly connected or coupled to other elements, or can also exist
Intermediary element.In addition, " connection " used herein or " coupling " can include wireless connection or wireless coupling.It is used herein to arrange
Taking leave "and/or" includes one or more associated wholes or any cell for listing item and all combines.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific terminology), with the general understanding identical meaning with the those of ordinary skill in art of the present invention.Should also
Understand, those terms defined in such as general dictionary, it should be understood that with the context with prior art
The consistent meaning of meaning, and unless by specific definitions as here, otherwise will not use idealization or excessively formal implication
To explain.
Below in conjunction with the accompanying drawings, by the description to embodiment, the content of the invention is described further.
It refer to Fig. 1, the stream of the preferred embodiment of the method for the embedded system loading symbol table that Fig. 1 provides for the present invention
Cheng Tu.Methods described includes：
S100, when receiving program debugging instruction, read and be pre-stored in symbol table file in ROM, wherein, the symbol table file
Include identifying code and version information.
Specifically, the mapping that the symbol table is used between designation, symbolic address and the symbol lengths of stored symbols
Relation, function, variable and pretreatment information that the symbol is used to describe in the embedded system image file.The symbol
Address is storage address of the symbol content in embedded system handles device internal memory, and symbol lengths are symbol contents in embedded system
The size of space-consuming in system processor memory.The identifying code and version information are raw in symbol table file generating process
Into.The identifying code and version information are used to, when the symbol table file is called, verify that the symbol table file is
It is no to be tampered.The preparatory of the symbol table that is loaded into can so be improved.
The ROM is configures the local spatial of the terminal of embedded system, i.e., described symbol table file is stored in the end
In the ROM Space of end equipment（For example, flash or EEPROM）Deng, and the internal memory of system is not take up, it can so avoid symbol table
Consumption of the file to internal memory, reduces the pressure of Installed System Memory.It is worth explanation, the symbol table file is to separate to deposit with image file
Storage, i.e., not stet list file in described image file.In the present embodiment, the embedded system is vxWorks systems
System.
In one embodiment of the invention, it is described when receiving program debugging instruction, read and be pre-stored in symbol in ROM
List file, wherein, the symbol table file includes before including identifying code and version information file：
S01, pre-establish symbol table file, and by the ROM of the symbol table file embedded system, wherein, the symbol table
File includes the version information of symbol table, identifying code and system.
Specifically, the symbol table file has been generated and has been stored in ROM before program debugging so that in system
During not connected network, the symbol table file can also be obtained, both can be so to get symbol table in shell debugging, again
Save the memory source of preciousness.In the present embodiment, the symbol table file can be loaded into embedded board by TFTP
On, to write ROM specified location.
The symbol table file can include version information, identifying code, symbol table symbol table length, i.e. symbol table text
Part can use Fig. 2 data structure.Wherein, version information is 16 bytes, and symbol table length is 4 bytes, and identifying code CRC is 4
Byte, Magic number is 4 bytes, and character list content is N byte.The symbol table length is the byte number of the symbol table content,
I.e. symbol table length is n.The version information is the version information of the system current version, and the version information is preferably version
This number, the identifying code CRC is calculated according to symbol table and obtained；The Magic number is prestores, for representing current sign table
Whether file storage is symbol table and its validity.For example, described Magic number=0x12345678 etc..
It is exemplary, it is described to pre-establish symbol table file, and by the ROM of the symbol table file embedded system, its
In, version information of the symbol table file comprising symbol table, identifying code and system is specifically included：
S011, in advance compiling do not carry the image file of symbol table, and compile symbol table according to the image file.
Specifically, symbol table compiling generation, the symbol table and image file when compiling image file
It is separated from each other.
S012, the version information for obtaining the system, and its corresponding identifying code is generated according to the symbol table.
Specifically, the identifying code is to be calculated to obtain according to symbol table file, for example, by calculating the every of the character list
The binary numeral of individual byte and obtain.
S013, the identifying code and version information be placed in the symbol table front end, to generate the symbol table file.
Specifically, the version information and identifying code insert the symbol table front end, and are believed version by strapping tool
Breath, identifying code and symbol table packing generation symbol table file.In the present embodiment, symbol is also included in the symbol table file
Table length and Magic number, the symbol table length are the byte number of the symbol table content, and the Magic number is to pre-set,
For judging the symbol table validity.
In another embodiment of invention, the symbol table file can be stored in ROM fixed position, so can be with
The symbol table file is quickly found, is reduced the time required to searching symbol table file.Accordingly, it is described to receive program debugging
During instruction, the symbol table file being pre-stored in ROM is read, wherein, the symbol table file includes identifying code and version information
Specially：
When receiving program debugging instruction, the symbol table file is read from ROM predeterminated position, wherein, the predeterminated position
At 1M skews.
S200, the identifying code for obtaining the symbol table file carrying, and the identifying code is verified.
Specifically, it is described that identifying code progress checking is referred to judge the symbol table text by the identifying code
The correctness of part, that is to say, that judge whether the symbol table is tampered.In the present embodiment, the symbol table file is also
Magic number is carried, so as to which the validity of the symbol table file is judged by the Magic number first, and it is effective at its
In the case of, then the identifying code is verified.
In one embodiment of the invention, it is described to obtain the identifying code that the symbol table file is carried, and test described
Card code carries out checking and specifically included：
S201, the Magic number for reading the symbol table file, and judge whether the Magic number is equal to preset characters；
If S202, equal, the sum of the binary numeral of all bytes in the symbol table is calculated, to obtain the first identifying code；
S203, the identifying code is compared with first identifying code, to be verified to the identifying code.
Specifically, the preset characters prestore for embedded system, the correctness for verifying the Magic number
's.In the present embodiment, the Magic number can be fixed, so that when system call sign list file, directly to described
Magic number is judged, to determine the validity of the symbol table file.
S300, when the authentication succeeds, by symbol table loading interface by the symbol table file import system, and starts to adjust
Examination.
Specifically, the symbol table is to import symbol table into system by system interface function.It is described to start debugging and refer to
Be to start shell and to be debugged.
In one embodiment of the invention, it is described when the authentication succeeds, by symbol table loading interface by the symbol
Table import system, and start debugging and specifically include：
S301, when the authentication succeeds, obtains the version information that the identifying code is carried, and working as the version information and system
Preceding version information is compared；
S302, when version information is consistent, by symbol table loading interface by the symbol table import system, and start debugging.
In the present embodiment, compared by the version information and the current version information of system that are carried to symbol table file
Compared with the problem of can avoiding the symbol table and not corresponding system version improves the successful probability of debugging.
The present invention also carries a kind of storage medium, its a plurality of instruction that is stored with, and the instruction is suitable to be loaded and held by processor
The row method that as above any embedded system loads symbol table.
The present invention also puies forward a kind of terminal, as shown in figure 3, it includes：
Processor 100, is adapted for carrying out each instruction；And
Storage device 200, suitable for storing a plurality of instruction, the instruction is suitable to be loaded by processor and performed as above any described embedding
The method that embedded system loads symbol table.
The implementation procedure of the instruction of above-mentioned storage medium and terminal has been described in detail in the above-mentioned methods, herein just not
An another statement.
In embodiment provided by the present invention, it should be understood that disclosed system and method, others can be passed through
Mode is realized.For example, device embodiment described above is only schematical, for example, the division of the module, is only
A kind of division of logic function, can there is other dividing mode when actually realizing, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual
Between coupling or direct-coupling or communication connection can be the INDIRECT COUPLING or communication link of device or unit by some interfaces
Connect, can be electrical, machinery or other forms.
The unit illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, it would however also be possible to employ hardware adds the form of SFU software functional unit to realize.
The above-mentioned integrated unit realized in the form of SFU software functional unit, can be stored in an embodied on computer readable and deposit
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are to cause a computer
Equipment (can be personal computer, server, or network equipment etc.) or processor (processor) perform the present invention each
The part steps of embodiment methods described.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (Read-
Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD etc. it is various
Can be with the medium of store program codes.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. a kind of method that embedded system loads symbol table, it is characterised in that it includes：
When receiving program debugging instruction, the symbol table file being pre-stored in ROM is read, wherein, the symbol table file is included
Identifying code and version information；
The identifying code that the symbol table file is carried is obtained, and the identifying code is verified；
When the authentication succeeds, by symbol table loading interface by the symbol table file import system, and debugging is started.
2. the method that embedded system loads symbol table according to claim 1, it is characterised in that described to receive program tune
During examination instruction, the symbol table file being pre-stored in ROM is read, wherein, the symbol table file is believed comprising identifying code and version
Include before breath file：
Pre-establish symbol table file, and by the ROM of the symbol table file embedded system, wherein, the symbol table file
Include the version information of symbol table, identifying code and system.
3. the method that embedded system loads symbol table according to claim 2, it is characterised in that described to pre-establish symbol
List file, and by the ROM of the symbol table file embedded system, wherein, the symbol table file includes symbol table, identifying code
And the version information of system is specifically included：
Compiling in advance does not carry the image file of symbol table, and compiles symbol table according to the image file；
The version information of the system is obtained, and its corresponding identifying code is generated according to the symbol table；
The identifying code and version information are placed in the symbol table front end, to generate the symbol table file.
4. the method that embedded system loads symbol table according to claim 3, it is characterised in that the identifying code is：Institute
State the sum of the binary numeral of all bytes in symbol table.
5. the method that embedded system loads symbol table according to claim 1, it is characterised in that the acquisition symbol
The identifying code that list file is carried, and identifying code progress checking is specifically included：
The Magic number of the symbol table file is read, and judges whether the Magic number is equal to preset characters；
If equal, the sum of the binary numeral of all bytes in the symbol table is calculated, to obtain the first identifying code；
The identifying code is compared with first identifying code, to be verified to the identifying code.
6. the method that embedded system loads symbol table according to claim 1, it is characterised in that described to be proved to be successful
When, by symbol table loading interface by the symbol table import system, and start debugging and specifically include：
When the authentication succeeds, the version information that the identifying code is carried is obtained, and by the version information and the current version of system
This information is compared；
When version information is consistent, by symbol table loading interface by the symbol table import system, and start debugging.
7. the method that embedded system loads symbol table according to claim 1, it is characterised in that described to receive program tune
During examination instruction, reading the symbol table file being pre-stored in ROM is specially：
When receiving program debugging instruction, the symbol table file is read from ROM predeterminated position, wherein, the predeterminated position
At 1M skews.
8. the method that embedded system loads symbol table according to claim 1, it is characterised in that the symbol table is used to deposit
The mapping relations between designation, symbolic address and the symbol lengths of symbol are stored up, the symbol is used to describe described embedded
Function, variable and pretreatment information in system image file.
9. a kind of storage medium, it is characterised in that its a plurality of instruction that is stored with, the instruction is suitable to be loaded and performed by processor
The method that the embedded system as described in claim 1-8 is any loads symbol table.
10. a kind of terminal, it is characterised in that it includes：
Processor, is adapted for carrying out each instruction；And
Storage device, suitable for storing a plurality of instruction, the instruction is suitable to be loaded by processor and performed as claim 1-8 is any
The method that the embedded system loads symbol table.
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| CN201710381067.8A CN107193604A (en) | 2017-05-25 | 2017-05-25 | Embedded system loads method, storage medium and the terminal of symbol table |
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| CN201710381067.8A CN107193604A (en) | 2017-05-25 | 2017-05-25 | Embedded system loads method, storage medium and the terminal of symbol table |
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| CN101706735A (en) * | 2009-11-26 | 2010-05-12 | 中兴通讯股份有限公司 | Embedded system and method for acquiring symbol table by same |
| CN103677851A (en) * | 2013-12-27 | 2014-03-26 | 瑞斯康达科技发展股份有限公司 | Method and device for generating embedded program operation symbol table |
| CN104679660A (en) * | 2015-03-26 | 2015-06-03 | 成都彬鸿科技有限公司 | Embedded system debugging method and device based on symbol table |
| CN106126367A (en) * | 2016-06-28 | 2016-11-16 | 湖北锐世数字医学影像科技有限公司 | A kind of self checking method and system of file |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101340314A (en) * | 2008-08-11 | 2009-01-07 | 中兴通讯股份有限公司 | Real-time debugging positioning method of embedded system and apparatus thereof |
| CN101706735A (en) * | 2009-11-26 | 2010-05-12 | 中兴通讯股份有限公司 | Embedded system and method for acquiring symbol table by same |
| CN103677851A (en) * | 2013-12-27 | 2014-03-26 | 瑞斯康达科技发展股份有限公司 | Method and device for generating embedded program operation symbol table |
| CN104679660A (en) * | 2015-03-26 | 2015-06-03 | 成都彬鸿科技有限公司 | Embedded system debugging method and device based on symbol table |
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Application publication date: 20170922 |