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xtensa: fix kernel register spilling 

commit 77d6273e79e3a86552fcf10cdd31a69b46ed2ce6 upstream.

call12 can't be safely used as the first call in the inline function,
because the compiler does not extend the stack frame of the bounding
function accordingly, which may result in corruption of local variables.

If a call needs to be done, do call8 first followed by call12.

For pure assembly code in _switch_to increase stack frame size of the
bounding function.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Max Filippov 2015-07-16 10:41:02 +03:00 committed by Greg Kroah-Hartman
parent 8db5a692d7
commit 0bd183de61
2 changed files with 21 additions and 12 deletions
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29
arch/xtensa/include/asm/traps.h
View File

@ -24,30 +24,39 @@ static inline void spill_registers(void)
{
#if XCHAL_NUM_AREGS > 16
__asm__ __volatile__ (
" call12 1f\n"
" call8 1f\n"
" _j 2f\n"
" retw\n"
" .align 4\n"
"1:\n"
#if XCHAL_NUM_AREGS == 32
" _entry a1, 32\n"
" addi a8, a0, 3\n"
" _entry a1, 16\n"
" mov a12, a12\n"
" retw\n"
#else
" _entry a1, 48\n"
" addi a12, a0, 3\n"
#if XCHAL_NUM_AREGS > 32
" .rept (" __stringify(XCHAL_NUM_AREGS) " - 32) / 12\n"
" call12 1f\n"
" retw\n"
" .align 4\n"
"1:\n"
" .rept (" __stringify(XCHAL_NUM_AREGS) " - 16) / 12\n"
" _entry a1, 48\n"
" mov a12, a0\n"
" .endr\n"
#endif
" _entry a1, 48\n"
" _entry a1, 16\n"
#if XCHAL_NUM_AREGS % 12 == 0
" mov a8, a8\n"
#elif XCHAL_NUM_AREGS % 12 == 4
" mov a12, a12\n"
#elif XCHAL_NUM_AREGS % 12 == 8
#elif XCHAL_NUM_AREGS % 12 == 4
" mov a4, a4\n"
#elif XCHAL_NUM_AREGS % 12 == 8
" mov a8, a8\n"
#endif
" retw\n"
#endif
"2:\n"
: : : "a12", "a13", "memory");
: : : "a8", "a9", "memory");
#else
__asm__ __volatile__ (
" mov a12, a12\n"

4
arch/xtensa/kernel/entry.S
View File

@ -1934,7 +1934,7 @@ ENDPROC(system_call)
mov a12, a0
.endr
#endif
_entry a1, 48
_entry a1, 16
#if XCHAL_NUM_AREGS % 12 == 0
mov a8, a8
#elif XCHAL_NUM_AREGS % 12 == 4
@ -1958,7 +1958,7 @@ ENDPROC(system_call)
ENTRY(_switch_to)
entry a1, 16
entry a1, 48
mov a11, a3 # and 'next' (a3)