We notice that the ESP points right into the stack, right after where the saved EIP should be. Typically, I put a debugging break point at the end of the function that returns, so I can see what the state of the registers are when we are right before the vulnerable functions ret instruction. As mentioned before, there are numerous ways to get the EIP to point to our code. Next, we need to write out where we want the EIP to go. Importance of public relations pdf.In Hack Proofing Your Network (Second Edition), 2002 Finding a Jump Point You'll also find the condition register documented in The Green Book. > Also, apart of the 'program counter' and it's use through lkAddr on the > shell, what are the uses of 'machine status' and 'Condition Register'. Chapter 6 will tell you all the various ways a program exception can be generated. > program > Exception current instruction address: 0x1e498738 > Machine Status Register: 0x0208b030 > Condition Register: 0x84000044 > Task: 0x1e4aa910 'CTx' It looks like the CTx task was doing some C++ and went into the weeds.Ĭould have been memory corruption at the above address, or something else - you'll have to investigate. > program > Exception current instruction address: 0x1e498738 > Machine Status Register: 0x0208b030 > Condition Register: 0x84000044 > 18be474 _tf12CQs+918: Set_10CFrUl () > 18ab130 Set_8CAntUl+3c: Set_8CAnt11e_ant_t () And while you have The Green Book open, you can look up the definition of the Machine Status Register in chapter 2, and read all about exceptions in chapter 6. If you look in 'The Green Book', aka Programming Environments for 32-bit Microprocessors, you will see that exception 0x700 is a 'Program Exception', in fact just like it says below. Something like this: > Exception number 1792: Task: 0x1e4aa910 (CTx) I don't know why WRS prints the exception numbers in decimal.ġ792 in hex is 0x700. > Can someone explain in detail the output of a task that generated an > exception, > i.e. The ada program needs to return a pretty large and ugly dynamic structure. > raised PROGRAM_ERROR: EXCEPTION_ACCESS_VIOLATION We have tried, in numerous ways, to come up with an ada library that can be used by c programs. In fact 'intrVecTable' (interrupt vector table) address was '0x000d0a50' which is in 'bss'. When i looked into symbol table of the VxWorks image (using 'lkup' in VxWorks shell), i couldn't find any function addresses close to '0x000d0a8'. Culprit is instruction at addr: 0x000d0a68. This may increase the number of people who actually respond. You should include the target HW information, i.e. 'Edward Gold' wrote in message First, it's obvious (by the numbers) to me you are running on a PowerPC.īut vxWorks runs on many different architectures.
O.S.: VxWorks 5.4 Development environment: Tornado 2.1 on WinNT 4 Thanks for your help in advance Edy Joe Durusau, 4:03 น. Something like this: Exception number 1792: Task: 0x1e4aa910 (CTx) program Exception current instruction address: 0x1e498738 Machine Status Register: 0x0208b030 Condition Register: 0x84000044 18be474 _tf12CQs+918: Set_10CFrUl () 18ab130 Set_8CAntUl+3c: Set_8CAnt11e_ant_t () program Exception current instruction address: 0x1e498738 Machine Status Register: 0x0208b030 Condition Register: 0x84000044 Task: 0x1e4aa910 'CTx' How 'Exception number' can be used and where are the list of exceptions numbers? Also, apart of the 'program counter' and it's use through lkAddr on the shell, what are the uses of 'machine status' and 'Condition Register'. Can someone explain in detail the output of a task that generated an exception, i.e. Hi all, I know that about a year ago this question was properly answered, but could not find it in the archives-and it's sure of great interest.
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