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| author | Dmitry Shmidt <dimitrysh@google.com> | 2016-11-15 17:02:38 -0800 |
|---|---|---|
| committer | Dmitry Shmidt <dimitrysh@google.com> | 2016-11-15 17:02:38 -0800 |
| commit | 324e88de4aba3b6d4e0453fb2adb094e4a53754c (patch) | |
| tree | f961e8c1eb2bcdefec062e0b86d4b5f307caee1e /arch/parisc | |
| parent | 93e3336909d88c3afca7ccdc8b009c435f37a70a (diff) | |
| parent | 4dab3e4df9944782cb3c229bd37f5ea8b5f52bac (diff) | |
Merge tag 'v4.4.32' into android-4.4.y
This is the 4.4.32 stable release
Change-Id: I5028402eadfcf055ac44a5e67abc6da75b2068b3
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/kernel/syscall.S | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S index fbafa0d0e2bf..a86b19fccb63 100644 --- a/arch/parisc/kernel/syscall.S +++ b/arch/parisc/kernel/syscall.S @@ -106,8 +106,6 @@ linux_gateway_entry: mtsp %r0,%sr4 /* get kernel space into sr4 */ mtsp %r0,%sr5 /* get kernel space into sr5 */ mtsp %r0,%sr6 /* get kernel space into sr6 */ - mfsp %sr7,%r1 /* save user sr7 */ - mtsp %r1,%sr3 /* and store it in sr3 */ #ifdef CONFIG_64BIT /* for now we can *always* set the W bit on entry to the syscall @@ -133,6 +131,14 @@ linux_gateway_entry: depdi 0, 31, 32, %r21 1: #endif + + /* We use a rsm/ssm pair to prevent sr3 from being clobbered + * by external interrupts. + */ + mfsp %sr7,%r1 /* save user sr7 */ + rsm PSW_SM_I, %r0 /* disable interrupts */ + mtsp %r1,%sr3 /* and store it in sr3 */ + mfctl %cr30,%r1 xor %r1,%r30,%r30 /* ye olde xor trick */ xor %r1,%r30,%r1 @@ -147,6 +153,7 @@ linux_gateway_entry: */ mtsp %r0,%sr7 /* get kernel space into sr7 */ + ssm PSW_SM_I, %r0 /* enable interrupts */ STREGM %r1,FRAME_SIZE(%r30) /* save r1 (usp) here for now */ mfctl %cr30,%r1 /* get task ptr in %r1 */ LDREG TI_TASK(%r1),%r1 |