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powerpc/64s/exception: clean up system call entry

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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>
This commit is contained in:
Nicholas Piggin 2019-06-28 15:33:20 +10:00 committed by Michael Ellerman
parent 1582009113
commit b0b2a93da4
1 changed files with 10 additions and 20 deletions
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30
arch/powerpc/kernel/exceptions-64s.S
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@ -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
#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) */
#ifdef CONFIG_RELOCATABLE
__LOAD_HANDLER(r10, system_call_common)
mtctr r10
bctr
#else
b system_call_common
#endif
.endif