| 1010880548589685a27b8f63ef54a3ea78e052fc |
|
28-Nov-2011 |
Arun Sharma <asharma@fb.com> |
Address x86_64 crashes when using sigaltstack
The crashes were tracked down to f->rpb_cfa_offset being incorrect.
The problem is that {rsp,rbp}_cfa_offset only have 15 bits, but for
SIGRETURN frame they are filled with:
// src/x86_64/Gstash_frame.c
f->cfa_reg_offset = d->cfa - c->sigcontext_addr;
f->rbp_cfa_offset = DWARF_GET_LOC(d->loc[RBP]) - d->cfa;
f->rsp_cfa_offset = DWARF_GET_LOC(d->loc[RSP]) - d->cfa;
The problem is that the delta here can be arbitrarily large when
sigaltstack is used, and can easily overflow the 15 and 30-bit fields.
When signal handler starts running, the stack layout is:
... higher addresses ...
ucontext
CFA->
__restore_rt (== pretcode in rt_sigframe from
linux-2.6/arch/x86/include/asm/sigframe.h)
SP ->
... sighandler runs on this stack.
... lower addresses ...
This makes it very convenient to find ucontext from the CFA.
Attached patch re-tested on Linux/x86_64, no new failures.
Signed-off-by: Paul Pluzhnikov <ppluzhnikov@google.com>
Reviwed-by: Lassi Tuura <lat@cern.ch>
/external/libunwind/src/x86_64/Gos-linux.c
|
| ae5c1f2adf4da04235d87d024d4d942c01b2b447 |
|
18-Apr-2011 |
Lassi Tuura <lat@cern.ch> |
Performance optimisations for fast trace.
Insert static branch prediction predicates in useful places and avoid
unnecessary code in the hottest paths. Bypass unnecessary indirect
calls, in particular to access_mem(), when known to be safe.
/external/libunwind/src/x86_64/Gos-linux.c
|
| 9e98f15e9aee12e67cd5956d06ccb559f6a06213 |
|
19-Mar-2011 |
Lassi Tuura <lat@iki.fi> |
Fast back-trace for x86_64 for only collecting the call stack.
Adds new function to perform a pure stack walk without unwinding,
functionally similar to backtrace() but accelerated by an address
attribute cache the caller maintains across calls.
/external/libunwind/src/x86_64/Gos-linux.c
|
| aa3bb307a30a5b78bf1ae4ac843ae53e354736f5 |
|
03-May-2010 |
Arun Sharma <arun@sharma-home.net> |
Fix merge errors
/external/libunwind/src/x86_64/Gos-linux.c
|
| 0176c4f723f1ea90eb20018091ca58eedf28a4a8 |
|
29-Apr-2010 |
Arun Sharma <arun@sharma-home.net> |
Merge commit 'fdc534ccb05d1e6c0438345d292203343a811701'
|
| fdc534ccb05d1e6c0438345d292203343a811701 |
|
29-Apr-2010 |
Arun Sharma <aruns@google.com> |
Silence a compiler warning
/external/libunwind/src/x86_64/Gos-linux.c
|
| d3c4bc42952a1aad0297b6f86569178814275a83 |
|
25-Apr-2010 |
Arun Sharma <aruns@google.com> |
Fix a compiler warning
/external/libunwind/src/x86_64/Gos-linux.c
|
| 92cc7fd78a5a79c4bb5f85bfb7d7fb025df9cd5a |
|
20-Apr-2010 |
Lassi Tuura <lat@cern.ch> |
Remove obsolete code for 'old way' of handling x86-64 signal frames.
/external/libunwind/src/x86_64/Gos-linux.c
|
| dac2d001afb1fa7040ca7d8ae57032f684d7023e |
|
20-Apr-2010 |
Lassi Tuura <lat@cern.ch> |
Identify signal frames by augmentation attribute.
/external/libunwind/src/x86_64/Gos-linux.c
|
| 1d9c5a356d72993d8e9f5ac70811a723ea156403 |
|
14-Apr-2010 |
Arun Sharma <aruns@google.com> |
Fix compiler warnings on x86_64 Linux
/external/libunwind/src/x86_64/Gos-linux.c
|
| caa6095aec43541bdbca1ad58d6f65b3de53a1ef |
|
08-Apr-2010 |
Arun Sharma <aruns@google.com> |
Fix compile errors on Linux
/external/libunwind/src/x86_64/Gos-linux.c
|
| 979af4502fe19b0d98459633731d004a4a010a0e |
|
05-Apr-2010 |
Konstantin Belousov <kostik@pooma.home> |
Move local_resume to os-specific file.
/external/libunwind/src/x86_64/Gos-linux.c
|
| 0dbeeeb08dc9a7e46281954e9225a84d4629a3db |
|
05-Apr-2010 |
Konstantin Belousov <kostik@pooma.home> |
Move uc_addr to os-specific file
/external/libunwind/src/x86_64/Gos-linux.c
|
| 8e53e62db913470952b8eb541834b876f7a6882c |
|
05-Apr-2010 |
Arun Sharma <aruns@google.com> |
Refactor os specific code for x86 (both 32 and 64 bit).
Move Linux specific code into ${arch}/Gos-linux.c
/external/libunwind/src/x86_64/Gos-linux.c
|