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[binutils-gdb] btrace: support 32-bit inferior on 64-bit host


*** TEST RESULTS FOR COMMIT d68e53f47932eb7c374df9b90faed7aca2eed9d7 ***

Author: Markus Metzger <markus.t.metzger@intel.com>
Branch: master
Commit: d68e53f47932eb7c374df9b90faed7aca2eed9d7

btrace: support 32-bit inferior on 64-bit host
The heuristic for filtering out kernel addressess in BTS trace checks the
most significant bit in each address.  This works fine for 32-bit and 64-bit
mode.

For 32-bit compatibility mode, i.e. a 32-bit inferior running on 64-bit
host, we need to check bit 63 (or any bit bigger than 31), not bit 31.

Use the machine field in struct utsname provided by a uname call to
determine whether we are running on a 64-bit host.

Thanks to Jan Kratochvil for reporting the issue.

gdb/
	* nat/linux-btrace.c: Include sys/utsname.h.
	(linux_determine_kernel_ptr_bits): New.
	(linux_enable_bts): Call linux_determine_kernel_ptr_bits.
	* x86-linux-nat.c (x86_linux_enable_btrace): Do not overwrite non-zero
	ptr_bits.

gdbserver/
	* linux-low.c (linux_low_enable_btrace): Do not overwrite non-zero
	ptr_bits.


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