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| author | Nicholas Piggin <npiggin@gmail.com> | 2019-06-28 07:33:20 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-07-02 13:39:48 +0200 |
| commit | b0b2a93da4c95ac808c4c43f24a1873ae3166a1a (patch) | |
| tree | 54a17eba5a98143363ad004fdd8bb8885c1cf477 /arch/powerpc/kernel | |
| parent | powerpc/64s/exception: move paca save area offsets into exception-64s.S (diff) | |
| download | linux-b0b2a93da4c95ac808c4c43f24a1873ae3166a1a.tar.xz linux-b0b2a93da4c95ac808c4c43f24a1873ae3166a1a.zip | |
powerpc/64s/exception: clean up system call entry
syscall / hcall entry unnecessarily differs between KVM and non-KVM
builds. Move the SMT priority instruction to the same location
(after INTERRUPT_TO_KERNEL).
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 24 |
1 files changed, 7 insertions, 17 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 4dfccc2efc95..564a77039701 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -1638,10 +1638,8 @@ EXC_COMMON(trap_0b_common, 0xb00, unknown_exception) std r10,PACA_EXGEN+EX_R10(r13) INTERRUPT_TO_KERNEL KVMTEST EXC_STD 0xc00 /* uses r10, branch to do_kvm_0xc00_system_call */ - HMT_MEDIUM mfctr r9 #else - HMT_MEDIUM mr r9,r13 GET_PACA(r13) INTERRUPT_TO_KERNEL @@ -1653,11 +1651,14 @@ BEGIN_FTR_SECTION beq- 1f END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) #endif - /* We reach here with PACA in r13, r13 in r9, and HMT_MEDIUM. */ - .if ! \virt + /* We reach here with PACA in r13, r13 in r9. */ mfspr r11,SPRN_SRR0 mfspr r12,SPRN_SRR1 + + HMT_MEDIUM + + .if ! \virt __LOAD_HANDLER(r10, system_call_common) mtspr SPRN_SRR0,r10 ld r10,PACAKMSR(r13) @@ -1665,24 +1666,13 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) RFI_TO_KERNEL b . /* prevent speculative execution */ .else + li r10,MSR_RI + mtmsrd r10,1 /* Set RI (EE=0) */ #ifdef CONFIG_RELOCATABLE - /* - * We can't branch directly so we do it via the CTR which - * is volatile across system calls. - */ __LOAD_HANDLER(r10, system_call_common) mtctr r10 - mfspr r11,SPRN_SRR0 - mfspr r12,SPRN_SRR1 - li r10,MSR_RI - mtmsrd r10,1 bctr #else - /* We can branch directly */ - mfspr r11,SPRN_SRR0 - mfspr r12,SPRN_SRR1 - li r10,MSR_RI - mtmsrd r10,1 /* Set RI (EE=0) */ b system_call_common #endif .endif |