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MIPS: fix EVA & non-SMP non-FPU FP context signal handling

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The save_fp_context & restore_fp_context pointers were being assigned
to the wrong variables if either:

  - The kernel is configured for UP & runs on a system without an FPU,
    since b2ead52828 "MIPS: Move & rename
    fpu_emulator_{save,restore}_context".

  - The kernel is configured for EVA, since ca750649e0 "MIPS: kernel:
    signal: Prevent save/restore FPU context in user memory".

This would lead to FP context being clobbered incorrectly when setting
up a sigcontext, then the garbage values being saved uselessly when
returning from the signal.

Fix by swapping the pointer assignments appropriately.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: stable@vger.kernel.org # v3.15+
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8230/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton 2014-10-28 11:25:51 +00:00 committed by Ralf Baechle
parent cf0a8aa022
commit 14fa12df1d
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/mips/kernel/signal.c
View File

@ -658,13 +658,13 @@ static int signal_setup(void)
save_fp_context = _save_fp_context;
restore_fp_context = _restore_fp_context;
} else {
save_fp_context = copy_fp_from_sigcontext;
restore_fp_context = copy_fp_to_sigcontext;
save_fp_context = copy_fp_to_sigcontext;
restore_fp_context = copy_fp_from_sigcontext;
}
#endif /* CONFIG_SMP */
#else
save_fp_context = copy_fp_from_sigcontext;;
restore_fp_context = copy_fp_to_sigcontext;
save_fp_context = copy_fp_to_sigcontext;
restore_fp_context = copy_fp_from_sigcontext;
#endif
return 0;