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From: Tom H. <to...@co...> - 2013-04-30 17:51:34
|
On 30/04/13 18:04, Julian Seward wrote: > On 04/18/2013 05:10 PM, Tom Hughes wrote: >> On 18/04/13 03:02, Tom Hughes wrote: > >> These failiures are caused by the change I committed yesterday to >> respect the PT_GNU_STACK information and make stacks non-executable >> when possible. >> >> It seems that when GDB wants to call a function in the target it is >> poking an INT3 instruction onto the targets stack, then poking the >> address of that instruction on to the stack as the return address and >> resuming at the address of the function it wants to call. > > Sounds plausible, but Philippe will know for sure. > > Did this get resolved yet? No. I was hoping Philippe would have some ideas. I did look a bit further at it, and it seems that when the target is run directly under gdb without valgrind it does things in a different way and doesn't use the stack as the return address. Tom -- Tom Hughes (to...@co...) http://compton.nu/ |
|
From: Julian S. <js...@ac...> - 2013-04-30 17:05:30
|
On 04/18/2013 05:10 PM, Tom Hughes wrote: > On 18/04/13 03:02, Tom Hughes wrote: > These failiures are caused by the change I committed yesterday to > respect the PT_GNU_STACK information and make stacks non-executable > when possible. > > It seems that when GDB wants to call a function in the target it is > poking an INT3 instruction onto the targets stack, then poking the > address of that instruction on to the stack as the return address and > resuming at the address of the function it wants to call. Sounds plausible, but Philippe will know for sure. Did this get resolved yet? J |
|
From: Julian S. <js...@ac...> - 2013-04-30 16:58:23
|
> So apart from some early architecture-specific parts of coregrind, > theoretically it ought to be straightforward to run an ARM-targeted valgrind > compiled as x86 then? Mmmhmhm .. I wouldn't like to say that. I imagine there would be a lot of places where small details would bite you. One that comes to mind is the debuginfo reader .. will it correctly handle ELF/Dwarf for ARM when running on an x86 host? If it's not too stupid a question, what's the motivation for doing this cross-platform operation? J |
|
From: Julian S. <js...@ac...> - 2013-04-30 16:47:39
|
> I was wondering what would be the issues, if any, of valgrinding a foreign > architecture process e.g. building an x86 build of ARM valgrind and then > using that to valgrind an ARM executable on an x86 machine? VEX (the instrumenting JIT) was originally designed with cross-JITting in mind, although that ability never got used. It would probably be possible, with some effort, to make that part of it work. But as others have said, the rest of the stuff (system calls, in particular) is majorly problematic and actually getting something to work would take a lot of effort. Keeping it verified/maintained over the long run would be even more effort. J |