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| author | Max Filippov <jcmvbkbc@gmail.com> | 2015-09-24 22:11:53 +0200 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2015-11-02 16:02:47 +0100 |
| commit | 5029615e25dc5040beb065f36743c127a8e51497 (patch) | |
| tree | 8b77e020c58e01175587f5267ab9ab8b223c3652 /arch/xtensa/kernel | |
| parent | Linux 4.3 (diff) | |
| download | linux-5029615e25dc5040beb065f36743c127a8e51497.tar.xz linux-5029615e25dc5040beb065f36743c127a8e51497.zip | |
xtensa: fixes for configs without loop option
Build-time fixes:
- make lbeg/lend/lcount save/restore conditional on kernel entry;
- don't clear lcount in platform_restart functions unconditionally.
Run-time fixes:
- use correct end of range register in __endla paired with __loopt, not
the unused temporary register. This fixes .bss zero-initialization.
Update comments in asmmacro.h;
- don't clobber a10 in the usercopy that leads to access to unmapped
memory.
Cc: <stable@vger.kernel.org>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel')
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 8 | ||||
| -rw-r--r-- | arch/xtensa/kernel/head.S | 2 |
2 files changed, 7 insertions, 3 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index 504130357597..db5c1765b413 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -367,8 +367,10 @@ common_exception: s32i a2, a1, PT_SYSCALL movi a2, 0 s32i a3, a1, PT_EXCVADDR +#if XCHAL_HAVE_LOOPS xsr a2, lcount s32i a2, a1, PT_LCOUNT +#endif /* It is now save to restore the EXC_TABLE_FIXUP variable. */ @@ -429,11 +431,12 @@ common_exception: rsync # PS.WOE => rsync => overflow /* Save lbeg, lend */ - +#if XCHAL_HAVE_LOOPS rsr a4, lbeg rsr a3, lend s32i a4, a1, PT_LBEG s32i a3, a1, PT_LEND +#endif /* Save SCOMPARE1 */ @@ -724,13 +727,14 @@ common_exception_exit: wsr a3, sar /* Restore LBEG, LEND, LCOUNT */ - +#if XCHAL_HAVE_LOOPS l32i a2, a1, PT_LBEG l32i a3, a1, PT_LEND wsr a2, lbeg l32i a2, a1, PT_LCOUNT wsr a3, lend wsr a2, lcount +#endif /* We control single stepping through the ICOUNTLEVEL register. */ diff --git a/arch/xtensa/kernel/head.S b/arch/xtensa/kernel/head.S index 15a461e2a0ed..9ed55649ac8e 100644 --- a/arch/xtensa/kernel/head.S +++ b/arch/xtensa/kernel/head.S @@ -249,7 +249,7 @@ ENTRY(_startup) __loopt a2, a3, a4, 2 s32i a0, a2, 0 - __endla a2, a4, 4 + __endla a2, a3, 4 #if XCHAL_DCACHE_IS_WRITEBACK |