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arm64: entry.S: convert el1_sync

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el1_sync unmasks exceptions on a case-by-case basis, debug exceptions
are unmasked, unless this was a debug exception. IRQs are unmasked
for instruction and data aborts only if the interupted context had
irqs unmasked.

Following our 'dai' order, el1_dbg should run with everything masked.
For the other cases we can inherit whatever we interrupted.

Add a macro inherit_daif to set daif based on the interrupted pstate.

Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Julien Thierry <julien.thierry@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
James Morse 2017-11-02 12:12:39 +00:00 committed by Will Deacon
parent 84d0fb1bb6
commit b55a5a1b0a
2 changed files with 10 additions and 8 deletions
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6
arch/arm64/include/asm/assembler.h
View File

@ -49,6 +49,12 @@
msr daif, \flags
.endm
/* Only on aarch64 pstate, PSR_D_BIT is different for aarch32 */
.macro inherit_daif, pstate:req, tmp:req
and \tmp, \pstate, #(PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
msr daif, \tmp
.endm
/*
* Enable and disable interrupts.
*/

12
arch/arm64/kernel/entry.S
View File

@ -510,11 +510,7 @@ el1_da:
* Data abort handling
*/
mrs x3, far_el1
enable_dbg
// re-enable interrupts if they were enabled in the aborted context
tbnz x23, #7, 1f // PSR_I_BIT
enable_irq
1:
inherit_daif pstate=x23, tmp=x2
clear_address_tag x0, x3
mov x2, sp // struct pt_regs
bl do_mem_abort
@ -525,7 +521,7 @@ el1_sp_pc:
* Stack or PC alignment exception handling
*/
mrs x0, far_el1
enable_dbg
inherit_daif pstate=x23, tmp=x2
mov x2, sp
bl do_sp_pc_abort
ASM_BUG()
@ -533,7 +529,7 @@ el1_undef:
/*
* Undefined instruction
*/
enable_dbg
inherit_daif pstate=x23, tmp=x2
mov x0, sp
bl do_undefinstr
ASM_BUG()
@ -550,7 +546,7 @@ el1_dbg:
kernel_exit 1
el1_inv:
// TODO: add support for undefined instructions in kernel mode
enable_dbg
inherit_daif pstate=x23, tmp=x2
mov x0, sp
mov x2, x1
mov x1, #BAD_SYNC