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powerpc/32: Enter exceptions with MSR_EE unset

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All exceptions handlers know when to reenable interrupts, so
it is safer to enter all of them with MSR_EE unset, except
for syscalls.

Suggested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[splited out from benh RFC patch]

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2019-04-30 12:38:59 +00:00
committed by Michael Ellerman
parent f97dec21a3
commit 642770dd96
7 changed files with 90 additions and 106 deletions
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26
arch/powerpc/kernel/head_fsl_booke.S
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@@ -383,7 +383,7 @@ interrupt_base:
EXC_XFER_LITE(0x0300, handle_page_fault)
1:
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_EE_LITE(0x0300, CacheLockingException)
EXC_XFER_LITE(0x0300, CacheLockingException)
/* Instruction Storage Interrupt */
INSTRUCTION_STORAGE_EXCEPTION
@@ -404,10 +404,10 @@ interrupt_base:
#ifdef CONFIG_E200
/* E200 treats 'normal' floating point instructions as FP Unavail exception */
EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, \
program_check_exception, EXC_XFER_EE)
program_check_exception, EXC_XFER_STD)
#else
EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, \
unknown_exception, EXC_XFER_EE)
unknown_exception, EXC_XFER_STD)
#endif
#endif
@@ -418,7 +418,7 @@ interrupt_base:
/* Auxiliary Processor Unavailable Interrupt */
EXCEPTION(0x2900, AP_UNAVAIL, AuxillaryProcessorUnavailable, \
unknown_exception, EXC_XFER_EE)
unknown_exception, EXC_XFER_STD)
/* Decrementer Interrupt */
DECREMENTER_EXCEPTION
@@ -426,7 +426,7 @@ interrupt_base:
/* Fixed Internal Timer Interrupt */
/* TODO: Add FIT support */
EXCEPTION(0x3100, FIT, FixedIntervalTimer, \
unknown_exception, EXC_XFER_EE)
unknown_exception, EXC_XFER_STD)
/* Watchdog Timer Interrupt */
#ifdef CONFIG_BOOKE_WDT
@@ -636,25 +636,25 @@ END_BTB_FLUSH_SECTION
bl load_up_spe
b fast_exception_return
1: addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_EE_LITE(0x2010, KernelSPE)
EXC_XFER_LITE(0x2010, KernelSPE)
#elif defined(CONFIG_SPE_POSSIBLE)
EXCEPTION(0x2020, SPE_UNAVAIL, SPEUnavailable, \
unknown_exception, EXC_XFER_EE)
unknown_exception, EXC_XFER_STD)
#endif /* CONFIG_SPE_POSSIBLE */
/* SPE Floating Point Data */
#ifdef CONFIG_SPE
EXCEPTION(0x2030, SPE_FP_DATA, SPEFloatingPointData,
SPEFloatingPointException, EXC_XFER_EE)
SPEFloatingPointException, EXC_XFER_STD)
/* SPE Floating Point Round */
EXCEPTION(0x2050, SPE_FP_ROUND, SPEFloatingPointRound, \
SPEFloatingPointRoundException, EXC_XFER_EE)
SPEFloatingPointRoundException, EXC_XFER_STD)
#elif defined(CONFIG_SPE_POSSIBLE)
EXCEPTION(0x2040, SPE_FP_DATA, SPEFloatingPointData,
unknown_exception, EXC_XFER_EE)
unknown_exception, EXC_XFER_STD)
EXCEPTION(0x2050, SPE_FP_ROUND, SPEFloatingPointRound, \
unknown_exception, EXC_XFER_EE)
unknown_exception, EXC_XFER_STD)
#endif /* CONFIG_SPE_POSSIBLE */
@@ -677,10 +677,10 @@ END_BTB_FLUSH_SECTION
unknown_exception)
/* Hypercall */
EXCEPTION(0, HV_SYSCALL, Hypercall, unknown_exception, EXC_XFER_EE)
EXCEPTION(0, HV_SYSCALL, Hypercall, unknown_exception, EXC_XFER_STD)
/* Embedded Hypervisor Privilege */
EXCEPTION(0, HV_PRIV, Ehvpriv, unknown_exception, EXC_XFER_EE)
EXCEPTION(0, HV_PRIV, Ehvpriv, unknown_exception, EXC_XFER_STD)
interrupt_end: