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| author | Max Filippov <jcmvbkbc@gmail.com> | 2013-04-07 23:29:19 +0200 |
|---|---|---|
| committer | Chris Zankel <chris@zankel.net> | 2013-05-09 10:07:10 +0200 |
| commit | 3ae908c99e944a7a5c4f4b2d8c603a6bc57b728b (patch) | |
| tree | 10159f1a9c02b862957d7d196cb1da6bb762ad39 /arch/xtensa/kernel/entry.S | |
| parent | xtensa: add stacktrace support (diff) | |
| download | linux-3ae908c99e944a7a5c4f4b2d8c603a6bc57b728b.tar.xz linux-3ae908c99e944a7a5c4f4b2d8c603a6bc57b728b.zip | |
xtensa: provide custom CALLER_ADDR* implementations
Definition of CALLER_ADDR* through __builtin_return_address makes
compiler insert calls to __xtensa_libgcc_window_spill, which in turn
makes fast_syscall_spill_registers syscall that clobbers registers when
called from the kernel mode, leading to invalid opcode exceptions on
return to userspace.
Provide definition for CALLER_ADDR0 as MAKE_PC_FROM_RA(a0, a1) and in
case CONFIG_FRAME_POINTER is enabled extract CALLER_ADDR{1-3} from
stack.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch/xtensa/kernel/entry.S')
0 files changed, 0 insertions, 0 deletions