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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2017-05-08 11:22:20 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2017-05-11 17:27:31 -0300
commit31073a53d8ff1e8bac53e34cb626dae5aa6ce69c (patch)
tree65aab5e22dcc488f4d17af6fea7cc837f9fe524c /libio/libio.h
parent488e08b600416ef96d8148fe5239a6387555b1eb (diff)
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powerpc: Fix signal handling in backtrace
Now with read consolidation which uses SYSCALL_CANCEL macro, a frame pointer is created in the syscall code and this makes the powerpc backtrace obtain a bogus entry for the signal handling patch. It is because it does not setup the correct frame pointer register (r1) based on the saved value from the kernel sigreturn. It was not failing because the syscall frame pointer register was the same one for the next frame (the function that actually called the syscall). This patch fixes it by setup the next stack frame using the saved one by the kernel sigreturn. It fixes tst-backtrace{5,6} from the read consolidation patch. Checked on powerpc-linux-gnu and powerpc64le-linux-gnu. * sysdeps/powerpc/powerpc32/backtrace.c (is_sigtramp_address): Use void* for argument type and use VDSO_SYMBOL macro. (is_sigtramp_address_rt): Likewise. (__backtrace): Setup expected frame pointer address for signal handling. * sysdeps/powerpc/powerpc64/backtrace.c (is_sigtramp_address): Use void* for argumetn type and use VSDO_SYMBOL macro. (__backtrace): Setup expected frame pointer address for signal handling.
Diffstat (limited to 'libio/libio.h')
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