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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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44
arch/powerpc/kernel/head_40x.S
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@@ -332,7 +332,7 @@ _ENTRY(saved_ksp_limit)
mfspr r4,SPRN_DEAR /* Grab the DEAR and save it */
stw r4,_DEAR(r11)
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_EE(0x600, alignment_exception)
EXC_XFER_STD(0x600, alignment_exception)
/* 0x0700 - Program Exception */
START_EXCEPTION(0x0700, ProgramCheck)
@@ -342,19 +342,19 @@ _ENTRY(saved_ksp_limit)
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x700, program_check_exception)
EXCEPTION(0x0800, Trap_08, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x0900, Trap_09, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x0A00, Trap_0A, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x0B00, Trap_0B, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x0800, Trap_08, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x0900, Trap_09, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x0A00, Trap_0A, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x0B00, Trap_0B, unknown_exception, EXC_XFER_STD)
/* 0x0C00 - System Call Exception */
START_EXCEPTION(0x0C00, SystemCall)
EXCEPTION_PROLOG
EXC_XFER_SYS(0xc00, DoSyscall)
EXCEPTION(0x0D00, Trap_0D, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x0E00, Trap_0E, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x0F00, Trap_0F, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x0D00, Trap_0D, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x0E00, Trap_0E, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x0F00, Trap_0F, unknown_exception, EXC_XFER_STD)
/* 0x1000 - Programmable Interval Timer (PIT) Exception */
. = 0x1000
@@ -571,25 +571,25 @@ _ENTRY(saved_ksp_limit)
mfspr r10, SPRN_SPRG_SCRATCH0
b InstructionAccess
EXCEPTION(0x1300, Trap_13, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1400, Trap_14, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1500, Trap_15, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1600, Trap_16, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1300, Trap_13, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x1400, Trap_14, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x1500, Trap_15, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x1600, Trap_16, unknown_exception, EXC_XFER_STD)
#ifdef CONFIG_IBM405_ERR51
/* 405GP errata 51 */
START_EXCEPTION(0x1700, Trap_17)
b DTLBMiss
#else
EXCEPTION(0x1700, Trap_17, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1700, Trap_17, unknown_exception, EXC_XFER_STD)
#endif
EXCEPTION(0x1800, Trap_18, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1900, Trap_19, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1A00, Trap_1A, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1B00, Trap_1B, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1C00, Trap_1C, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1D00, Trap_1D, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1E00, Trap_1E, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1F00, Trap_1F, unknown_exception, EXC_XFER_EE)
EXCEPTION(0x1800, Trap_18, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x1900, Trap_19, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x1A00, Trap_1A, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x1B00, Trap_1B, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x1C00, Trap_1C, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x1D00, Trap_1D, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x1E00, Trap_1E, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x1F00, Trap_1F, unknown_exception, EXC_XFER_STD)
/* Check for a single step debug exception while in an exception
* handler before state has been saved. This is to catch the case
@@ -665,7 +665,7 @@ Decrementer:
FITException:
EXCEPTION_PROLOG
addi r3,r1,STACK_FRAME_OVERHEAD;
EXC_XFER_EE(0x1010, unknown_exception)
EXC_XFER_STD(0x1010, unknown_exception)
/* Watchdog Timer (WDT) Exception. (from 0x1020) */
WDTException: