CN1838074A - Method and system for acquiring function parameter on 64-bit windows operating system - Google Patents
Method and system for acquiring function parameter on 64-bit windows operating system Download PDFInfo
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- CN1838074A CN1838074A CN 200610057613 CN200610057613A CN1838074A CN 1838074 A CN1838074 A CN 1838074A CN 200610057613 CN200610057613 CN 200610057613 CN 200610057613 A CN200610057613 A CN 200610057613A CN 1838074 A CN1838074 A CN 1838074A
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Abstract
This invention relates to a method and system for acquiring function parameter on 64-bit windows operating system. Wherein, producing a trap function to process the obtained parameter; modifying the system function entry instruction into the first skip instruction pointed to the preset entry address of the trap function; producing the pile function with copying the instruction set covered by the first skip instruction into appointed buffer zone, changing the relative address operation into absolute address operation, and adding the second skip instruction to point to the next instruction followed the first one; when calling system function by the first application program, calling the trap function by the first skip instruction to obtain parameters for processing, then calling pile function to complete the covered instruction in system function, and returning to continue the system function by the second skip instruction. This invention ensures normal execution to program.
Description
Technical field
The present invention relates to acquisition methods, especially be directed to the acquisition methods of function parameter in 64 bit windows operating systems based on parameter in the function execution of form (WINDOWS) operating system.
Background technology
Windows provides a series of application programming interfaces (API) function, also is called system function, and for the application call based on Windows, nearly all application program that runs on Windows all can be called described API.For example: when carrying out the literal input operation, corresponding word processor then calls the API that is used for literal output that Windows provides, and is implemented in the enterprising style of writing word of machine screen and shows.
In program process, for complete operation, a program also needs to obtain the program implementation parameter that other are being carried out usually.For example: the speech operation got in certain speech in the text that instant translation software is opened notepad, realize the speech of getting of this speech is operated, the correlation parameter of API Calls when instant translation software need obtain this speech of output, yet the output of content is that the API that notepad application is directly called Windows and provided finishes in the text file, and the parameter that it transmitted is that described instant translation software can't directly obtain from notepad.Therefore, certain application program will be obtained certain parameter in other application programs, just need carry out intercepting and capturing when these application call Windows API.
Prior art has realized above-mentioned functions on 32 bit windows operating systems, will obtain parameter that application A PP1 calling system function T extOutA transmitted with application A PP2 is implementation method under existing 32 systems of example explanation.
Function of design is used to handle the parameter that is blocked in application A PP2, is called trap function (Trap); Fig. 1 is the address space synoptic diagram, the figure shows the storage organization of function in virtual address space, promptly realize calling by the access function entry address, when APP1 calls TextOutA, revise the pairing instruction in entry address of TextOutA, revise it and be jump instruction, purpose is to jump to the entry address of trap function, thereby carries out the trap function; Because revising the entry instruction of TextOutA function is a jump instruction, under 32 bit windows operating systems, jump instruction generally occupies 5 bytes, the scope of the instruction strip number N of 5 bytes that begin from the inlet of TextOutA function is, N＞=1 and N＜=5, this N bar instruction is replaced by jump instruction, cause the TextOutA can not be by complete execution, based on this reason, need be before revising TextOutA function entrance address, just calculate the N value, and the instruction of this N bar copied in the buffer zone, and, generate pile function (Stub) in jump instruction of this N bar instruction back increase (be used for redirect and return the N+1 immediate skip continuation execution that the former entry address of TextOutA function begins).
Based on said method, and with reference to parameter acquiring process flow diagram shown in Figure 2 as can be known.(1) during APP1 calling system function T extoutA, (2) the trap function will be intercepted and captured the parameter that APP1 sends to system function TextoutA, (3) and after parameter is handled call pile function, carry out the described N bar instruction that is replicated according to described parameter, (4) and then by the jump instruction redirect return the instruction of TextoutA N+1 bar, continue to carry out TextOutA, so not only obtained APP2 and passed to the parameter of TextoutA, and can guarantee the normal execution of TextoutA.Said process is transparent for APP1.
The top n instruction of system function inlet will be capped in the said method, because the data in the register need be preserved/recover to 32-bit operating system by stack, function entrance begins to be generally stack instruction, therefore the instruction that is capped/back up all is those stack instructions and can not relate to the operation of address generally speaking, and it is still normal that those instructions backup in the pile function execution.Even address functional instruction in entry instruction, occurred relating to,, thereby only need carry out simple computation and can obtain described instruction tram pointed because 32 bit addressing spaces are little.
Yet 64 bit manipulation systems do not use the stack Data transmission, and the instruction that function entrance begins just has the operation that relates to the address; And, under the 64 bit manipulation systems, instruct shared byte number to increase, the possibility that comprises address functional instruction in the feasible instruction of being backed up increases accordingly.The problem that will occur a large amount of address arithmetics when therefore being applied to prior art in the 64 bit manipulation systems, and, because under 64 system environmentss,, thereby adopt under 32 systems simply that computing method can't obtain correct address because addressing space is very big.
Summary of the invention
In order to address the above problem, to the purpose of this invention is to provide and a kind ofly can be implemented in the method for obtaining function parameter under 64 bit windows operating systems.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions:
Obtain the method for function parameter under a kind of 64 bit windows operating systems, be used to obtain first Application Parameters, comprising: generate the trap function and be used for the parameter of obtaining is handled; Revising the system function entry instruction is that the trap function entrance address of presetting is pointed in first jump instruction; Generate pile function, comprise: the system function inlet will be copied to definite buffer zone by the instruction set that first jump instruction covers, wherein the relative address operational transformation is an absolute address operation, and is adding the instruction of article one after first jump instruction described in the second jump instruction pointing system function after the described instruction set; When the first application call system function, the trap function calls the trap function by described first jump instruction and gets parms and handle, and then call pile function and finish the instruction that is capped in the system function, and return continuation executive system function by second jump instruction.
On the said method basis, realize of the conversion of relative address operational order to the absolute address operation instruction by searching the instruction code table that presets.
On the said method basis, calculate first jump instruction takies address space in system function instruction number, and then determine to copy to the buffer of commands collection by dis-assembling.
On the said method basis, after first application program is finished system function and called, also comprise returning in the system function with backuping to buffer of commands in the pile function.
Address function in the described method comprises addressing operation.
Obtain the system of function parameter in a kind of 64 windows systems, be used for when the system function unit is determined in first application call, obtaining its parameter, comprise: the system function unit, the entry address instruction is first jump instruction, points to described trap function entrance address; The trap function unit is handled the parameter of obtaining, and calls the pile function unit behind complete operation; The pile function unit comprises the instruction set that is covered by first jump instruction in the system function, comprises the instruction of absolute address operation in this instruction set; Also comprise first instruction address after first jump instruction described in the second jump instruction pointing system function unit after the described instruction set.
Wherein, described address function comprises addressing operation.
Above technical scheme as can be seen, because the relative address operational order of among the present invention instruction in the pile function being concentrated is transformed to the absolute address operation instruction, the sensing of described address does not change with the change of this instruction storage address, and then described instruction set be copied to determine buffer zone after, address functional instruction wherein (addressing operation or address redirect) still can point to correct instruction address, guaranteed the smooth execution of system function, the operation that makes the present invention obtain function parameter can not influence the normal execution of program.
Description of drawings
Fig. 1 is the address space synoptic diagram;
Fig. 2 obtains schematic diagram for function parameter;
Fig. 3 is pile function product process figure among the present invention;
Fig. 4 finishes the parameter acquiring process flow diagram for the present invention.
Embodiment
The acquisition methods of function parameter in 64 systems involved in the present invention.
Described 64 are meant that (General-Purpose Register, data width GPRs) (bit wide) is 64 to the CPU general-purpose register.It is the data of 8 bytes that 64 processor can once transmit with computing 64bit, compare 32 existing bit processors and once can only handle the i.e. data of 4 bytes of 32bit, in the identical clock period, the data volume that 64 bit platforms are handled is the twice of 32 bit platform deal with data amounts in theory; And, the advantage of 64 bit processors also is embodied in the control of system to internal memory, the addressing space of existing 32 bit processors is 4GB to the maximum, and the 282TB of the addressing space of 64 bit platforms (1TB=1024GB) makes and can carry out wider data computation and support more jumbo internal memory.
Adopt the mode of relative address operation in the prevailing system.Because after program and function are loaded into internal memory at every turn, institute of system addresses distributed space all is different, be that the specific address that each program or function are loaded in the internal memory all is different, therefore relate to operations such as the addressing of address or redirect in the program and all use relative address usually, relative address is the address offset that carries out on function first address basis; Even the use relative address could guarantee to be loaded into the specific address difference in the internal memory at every turn, addressing instruction still can normally be carried out.
Yet, for the instruction of using relative address, after the relative address operational order backuped to pile function, because the first address of pile function is different with the first address of function, therefore cause the address after the first address enterprising line displacement in basis of pile function, be not the address of original function first address enterprising line displacement in basis, calling program carried out mistake occurred.
Based on above-mentioned analysis, the present invention is primarily aimed at the improvement that the duplicate instructions step is done in the solution of existing 32-bit operating system, and it can be applicable on the 64 bit manipulation systems.Its core concept is: relative instruction is converted to specific address.Concrete, carry out instruction analysis for backuping to definite buffer of commands, all are related to the instruction of relative address, for example the operation of relative addressing mode is or/and jump instruction relatively, adopt absolute addressing and absolute jump instruction to carry out conversion, because described process need generates extra cpu instruction and just can finish, thereby is referred to as dynamically heavily to collect, dynamically the process of compilation is finished by tabling look-up; After dynamically heavily compilation is finished, generate pile function, the last item instruction of this function is absolute jump instruction, is used for redirect and returns system function to guarantee the normal execution of system function.
Below specify the implementation of obtaining the function parameter method under 64 bit windows operating systems of the present invention.
Generate the trap function, be used for operation getparms; Described trap function generates according to professional real needs, and the present invention does not specifically limit.
If application A PP2 need obtain the parameter of application A PP1, then in APP2, write the code injection function, after application A PP2 is loaded into internal memory, the code injection function is loaded into personal code work in the same address space of the system function that will call with application A PP1 and APP1, finishes the modification of system function and the generation of pile function.
The generation of pile function among the present invention is described and to the modification of system function with reference to Fig. 3.
Step 31: the entry address that obtains system function;
Step 32: revising the system function entry instruction is that the trap function entrance address of presetting is pointed in first jump instruction; And the computing system function entrance is by the instruction number N of the shared address space of first jump instruction;
Instruction takies the address space of at least one byte.Processor reads an instruction at every turn from storer, and after instruction fetch is finished, automatically program counter value is become the address of next bar instruction according to classes of instructions; Simultaneously, the instruction of obtaining is placed in the order register, and this instruction is explained and carried out to processor.Under the 64 bit manipulation systems, absolute jump instruction (jmp) takies 14 bytes usually, therefore may need to back up minimum 1 at the system function inlet, and maximum 14 instructions are in pile function;
As shown in Figure 1, be stored in the machine language that is of address space, computing machine can only be discerned described machine language, promptly by 0 and 1 code that constitutes; But in when programming, do not adopt machine language usually, thereby all application programs all to convert machine language to by interpreter or compiler when carrying out and just can run on the machine; Adopt the method for dis-assembling to realize in system function, taking the calculating of the instruction number of address space in this step to going out first jump instruction;
Step 33: those N bar instructions are duplicated, be saved in buffer zone;
Step 34: the instruction set that instruction constitutes to described N bar is analyzed, and is absolute address operation with wherein relative address operational transformation;
Realize of the conversion of described relative address operational order according to the instruction code table that presets to the absolute address operation instruction;
Step 35: add second jump instruction in that described instruction set is last, this jump instruction is the specific address jump instruction, is used to jump to the N+1 bar instruction of original system function entrance instruction, i.e. the system function article one instruction after described first jump instruction that enters the mouth;
Step 36: generate pile function.
On the said method basis,, further specify the realization flow that the present invention on the said method basis obtains function parameter with reference to Fig. 4.
Step 41: application call system function;
Step 42: jump to the trap function, make the trap function call, carry out the trap function parameter is operated accordingly to obtain the relevant parameter that application program is sent;
Step 43: call pile function, and carry out;
Step 44: jump to the instruction of system function N+1 bar, continue the subsequent instructions in the executive system function;
Step 45: the instruction that will backup in the buffer zone returns in the system function; Can if continue interception parameter, then not carry out the instruction of step 45 and reply the opportunity of the instruction of described recovery backup according to the demand of function, iff being to tackle once, then carries out this step.
The present invention also provides the system that obtains function parameter in a kind of 64 windows systems, is used for obtaining when the system function unit is determined in first application call its parameter.This system comprises:
The system function unit, the entry address instruction is first jump instruction, points to described trap function entrance address;
The trap function unit is handled the parameter of obtaining, and calls the pile function unit behind complete operation;
The pile function unit comprises the instruction set that is covered by first jump instruction in the system function, comprises the instruction of absolute address operation in this instruction set; Also comprise first instruction address after first jump instruction described in the second jump instruction pointing system function unit after the described instruction set.
The generation method of each unit can repeat no more referring to the respective description of method above herein in the said system.
More than the method and system of obtaining function parameter under a kind of 64 bit windows operating systems provided by the present invention are described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (7)
1, obtain the method for function parameter under a kind of 64 bit windows operating systems, be used to obtain first Application Parameters, it is characterized in that:
Generating the trap function is used for the parameter of obtaining is handled;
Revising the system function entry instruction is that the trap function entrance address of presetting is pointed in first jump instruction;
Generate pile function, comprise: the system function inlet will be copied to definite buffer zone by the instruction set that first jump instruction covers, wherein the relative address operational transformation is an absolute address operation, and is adding the instruction of article one after first jump instruction described in the second jump instruction pointing system function after the described instruction set;
When the first application call system function, the trap function calls the trap function by described first jump instruction and gets parms and handle, and then call pile function and finish the instruction that is capped in the system function, and return continuation executive system function by second jump instruction.
2, obtain the method for function parameter under 64 bit windows operating systems as claimed in claim 1, it is characterized in that:
Realize of the conversion of relative address operational order by searching the instruction code table that presets to the absolute address operation instruction.
3, obtain the method for function parameter under 64 bit windows operating systems as claimed in claim 1, it is characterized in that:
Calculate first jump instruction takies address space in system function instruction number by dis-assembling, and then determine to copy to the buffer of commands collection.
4, as obtaining the method for function parameter under one of them described 64 bit windows operating system of claim 1 to 3, it is characterized in that:
After first application program is finished system function and called, also comprise returning in the system function with backuping to buffer of commands in the pile function.
5, obtain the method for function parameter under 64 bit windows operating systems as claimed in claim 1, it is characterized in that:
Described address function comprises addressing operation.
6, obtain the system of function parameter in a kind of 64 windows systems, be used for when the system function unit is determined in first application call, obtaining its parameter, it is characterized in that, comprising:
The system function unit, the entry address instruction is first jump instruction, points to described trap function entrance address;
The trap function unit is handled the parameter of obtaining, and calls the pile function unit behind complete operation;
The pile function unit comprises the instruction set that is covered by first jump instruction in the system function, comprises the instruction of absolute address operation in this instruction set; Also comprise first instruction address after first jump instruction described in the second jump instruction pointing system function unit after the described instruction set.
7, obtain the system of function parameter in 64 windows systems as claimed in claim 6, it is characterized in that:
Described address function comprises addressing operation.
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