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arm64: entry.S convert el0_sync 

el0_sync also unmasks exceptions on a case-by-case basis, debug exceptions
are enabled, unless this was a debug exception. Irqs are unmasked for
some exception types but not for others.

el0_dbg should run with everything masked to prevent us taking a debug
exception from do_debug_exception. For the other cases we can unmask
everything. This changes the behaviour of fpsimd_{acc,exc} and el0_inv
which previously ran with irqs masked.

This patch removed the last user of enable_dbg_and_irq, remove it.

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 12:12:40 +00:00 committed by Will Deacon
parent b55a5a1b0a
commit 746647c75a
2 changed files with 10 additions and 23 deletions
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9
arch/arm64/include/asm/assembler.h
View File

@ -97,15 +97,6 @@
9990:
.endm
/*
* Enable both debug exceptions and interrupts. This is likely to be
* faster than two daifclr operations, since writes to this register
* are self-synchronising.
*/
.macro enable_dbg_and_irq
msr daifclr, #(8 | 2)
.endm
/*
* SMP data memory barrier
*/

24
arch/arm64/kernel/entry.S
View File

@ -670,8 +670,7 @@ el0_da:
* Data abort handling
*/
mrs x26, far_el1
// enable interrupts before calling the main handler
enable_dbg_and_irq
enable_daif
ct_user_exit
clear_address_tag x0, x26
mov x1, x25
@ -683,8 +682,7 @@ el0_ia:
* Instruction abort handling
*/
mrs x26, far_el1
// enable interrupts before calling the main handler
enable_dbg_and_irq
enable_daif
ct_user_exit
mov x0, x26
mov x1, x25
@ -695,7 +693,7 @@ el0_fpsimd_acc:
/*
* Floating Point or Advanced SIMD access
*/
enable_dbg
enable_daif
ct_user_exit
mov x0, x25
mov x1, sp
@ -705,7 +703,7 @@ el0_fpsimd_exc:
/*
* Floating Point or Advanced SIMD exception
*/
enable_dbg
enable_daif
ct_user_exit
mov x0, x25
mov x1, sp
@ -716,8 +714,7 @@ el0_sp_pc:
* Stack or PC alignment exception handling
*/
mrs x26, far_el1
// enable interrupts before calling the main handler
enable_dbg_and_irq
enable_daif
ct_user_exit
mov x0, x26
mov x1, x25
@ -728,8 +725,7 @@ el0_undef:
/*
* Undefined instruction
*/
// enable interrupts before calling the main handler
enable_dbg_and_irq
enable_daif
ct_user_exit
mov x0, sp
bl do_undefinstr
@ -738,7 +734,7 @@ el0_sys:
/*
* System instructions, for trapped cache maintenance instructions
*/
enable_dbg_and_irq
enable_daif
ct_user_exit
mov x0, x25
mov x1, sp
@ -753,11 +749,11 @@ el0_dbg:
mov x1, x25
mov x2, sp
bl do_debug_exception
enable_dbg
enable_daif
ct_user_exit
b ret_to_user
el0_inv:
enable_dbg
enable_daif
ct_user_exit
mov x0, sp
mov x1, #BAD_SYNC
@ -836,7 +832,7 @@ el0_svc:
mov wsc_nr, #__NR_syscalls
el0_svc_naked: // compat entry point
stp x0, xscno, [sp, #S_ORIG_X0] // save the original x0 and syscall number
enable_dbg_and_irq
enable_daif
ct_user_exit 1
ldr x16, [tsk, #TSK_TI_FLAGS] // check for syscall hooks