nitesh.jain added inline comments.
================
Comment at: source/Plugins/Process/Linux/NativeRegisterContextLinux.cpp:53
@@ -22,2 +52,3 @@
+
NativeRegisterContextLinux::NativeRegisterContextLinux(NativeThreadProtocol
&native_thread,
uint32_t
concrete_frame_idx,
----------------
labath wrote:
> jaydeep wrote:
> > We have tried executing ptrace(NT_PRSTATUS) on MIPS with 3.18. It is able
> > to detect the arch correctly (64->64 and 64->32). However with 3.10 it
> > fails with EIO. Is there any fallback method when ptrace(NT_PRSTATUS) fails?
> Thanks for checking that out.
>
> This makes things a bit tricky. We *could* fallback to the "parse the
> executable ELF" method of getting the architecture, but that would make this
> patch a bit pointless, as that is what I am trying to remove in the first
> place. I suppose we could make the fallback mips-only, but that will not be
> too ideal either.
>
> I don't know about any other fallbacks. It would be interesting to know how
> strace does that. I've tried looking at strace source code, but I could not
> make much out of it. Do you know if a single strace binary is capable of
> correctly tracing both 32- and 64-bit processes? If so, could you try running
> the following experiment for me:
> - create a simple c file that does a sleep(1) and exits
> - compile 32- and 64-bit versions of the executable
> - execute the following commands:
> ```
> strace -o /tmp/32.txt -- strace -o /dev/null -- a.out.32
> strace -o /tmp/64.txt -- strace -o /dev/null -- a.out.64
> ```
>
> Could you send me the outputs (32.txt, 64.txt). Maybe I'll be able to figure
> something out from that.
>
> If that does not work, I may have to abandon this.
>
> thanks.
// 32 bit ELF
gcc-4.9 -g -O0 -mabi=64 -mips64r2 simple.c -o a.out.64
// 64 bit ELF
gcc-4.9 -g -O0 -mabi=32 -mips32r2 simple.c -o a.out.32
// Strace for 32 and 64 bit
strace -o /tmp/64.txt -- strace -o /dev/null -- ./a.out.64
strace -o /tmp/32.txt -- strace -o /dev/null -- ./a.out.32
// File command output for both file
a.out.64: ELF 64-bit LSB executable, MIPS, MIPS64 rel2 version 1 (SYSV),
dynamically linked, interpreter /lib64/ld.so.1,
BuildID[sha1]=6e0f92a8abee292b4b6462d79ec0420a3d8aaad0, for GNU/Linux 2.6.32,
not stripped
a.out.32: ELF 32-bit LSB executable, MIPS, MIPS32 rel2 version 1, dynamically
linked, interpreter /lib/ld.so.1, for GNU/Linux 2.6.32,
BuildID[sha1]=c4e09148526975f777e3e70bec85868616d3ce94, not stripped
{F1978053}
{F1978054}
http://reviews.llvm.org/D20368
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