xtensa: fix coprocessor part of ptrace_{get,set}xregs

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commit 38a35a78c5 upstream.

Layout of coprocessor registers in the elf_xtregs_t and
xtregs_coprocessor_t may be different due to alignment. Thus it is not
always possible to copy data between the xtregs_coprocessor_t structure
and the elf_xtregs_t and get correct values for all registers.
Use a table of offsets and sizes of individual coprocessor register
groups to do coprocessor context copying in the ptrace_getxregs and
ptrace_setxregs.
This fixes incorrect coprocessor register values reading from the user
process by the native gdb on an xtensa core with multiple coprocessors
and registers with high alignment requirements.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

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Max Filippov 2018-11-26 18:06:01 -08:00 • committed by Ben Hutchings

parent 0d6e25c4bf

commit 8dc4dd2c7b

1 changed files with 38 additions and 4 deletions

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arch/xtensa/kernel/ptrace.c

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