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| author | Nicholas Piggin <npiggin@gmail.com> | 2018-01-10 03:07:15 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-10 03:07:31 +1100 |
| commit | b8e90cb7bc04a509e821e82ab6ed7a8ef11ba333 (patch) | |
| tree | e213537c8a4160cea7ab794cadda60564e4c8bcd /arch | |
| parent | 222f20f140623ef6033491d0103ee0875fe87d35 (diff) | |
| download | linux-b8e90cb7bc04a509e821e82ab6ed7a8ef11ba333.tar.gz linux-b8e90cb7bc04a509e821e82ab6ed7a8ef11ba333.tar.bz2 linux-b8e90cb7bc04a509e821e82ab6ed7a8ef11ba333.zip | |
powerpc/64: Convert the syscall exit path to use RFI_TO_USER/KERNEL
In the syscall exit path we may be returning to user or kernel
context. We already have a test for that, because we conditionally
restore r13. So use that existing test and branch, and bifurcate the
return based on that.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index e68faa4d1b13..724733b74744 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -267,13 +267,23 @@ BEGIN_FTR_SECTION END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) ld r13,GPR13(r1) /* only restore r13 if returning to usermode */ + ld r2,GPR2(r1) + ld r1,GPR1(r1) + mtlr r4 + mtcr r5 + mtspr SPRN_SRR0,r7 + mtspr SPRN_SRR1,r8 + RFI_TO_USER + b . /* prevent speculative execution */ + + /* exit to kernel */ 1: ld r2,GPR2(r1) ld r1,GPR1(r1) mtlr r4 mtcr r5 mtspr SPRN_SRR0,r7 mtspr SPRN_SRR1,r8 - RFI + RFI_TO_KERNEL b . /* prevent speculative execution */ .Lsyscall_error: |