ARC: use correct offset in pt_regs for saving/restoring user mode r25

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commit 86147e3cfa upstream.

User mode callee regs are explicitly collected before signal delivery or
breakpoint trap. r25 is special for kernel as it serves as task pointer,
so user mode value is clobbered very early. It is saved in pt_regs where
generally only scratch (aka caller saved) regs are saved.

The code to access the corresponding pt_regs location had a subtle bug as
it was using load/store with scaling of offset, whereas the offset was already
byte wise correct. So fix this by replacing LD.AS with a standard LD

Signed-off-by: Liav Rehana <liavr@mellanox.com>
Reviewed-by: Alexey Brodkin <abrodkin@synopsys.com>
[vgupta: rewrote title and commit log]
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Liav Rehana 2016-08-16 10:55:35 +03:00 • committed by Greg Kroah-Hartman

parent 413d5877ef

commit 45a945050d

1 changed files with 2 additions and 2 deletions

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arch/arc/include/asm/entry.h

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