mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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e220ba6022
Handle incorrectly reported permission faults for qsd8650. On permission faults, retry MVA to PA conversion. If retry detects translation fault. Report as translation fault. Cc: Jamie Lokier <jamie@shareable.org> Signed-off-by: Dave Estes <cestes@quicinc.com>
55 lines
1.2 KiB
ArmAsm
55 lines
1.2 KiB
ArmAsm
#include <linux/linkage.h>
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#include <asm/assembler.h>
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/*
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* Function: v7_early_abort
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*
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* Params : r2 = address of aborted instruction
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* : r3 = saved SPSR
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*
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* Returns : r0 = address of abort
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* : r1 = FSR, bit 11 = write
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* : r2-r8 = corrupted
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* : r9 = preserved
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* : sp = pointer to registers
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*
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* Purpose : obtain information about current aborted instruction.
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*/
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.align 5
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ENTRY(v7_early_abort)
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/*
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* The effect of data aborts on on the exclusive access monitor are
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* UNPREDICTABLE. Do a CLREX to clear the state
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*/
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clrex
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mrc p15, 0, r1, c5, c0, 0 @ get FSR
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mrc p15, 0, r0, c6, c0, 0 @ get FAR
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/*
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* V6 code adjusts the returned DFSR.
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* New designs should not need to patch up faults.
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*/
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#if defined(CONFIG_VERIFY_PERMISSION_FAULT)
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/*
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* Detect erroneous permission failures and fix
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*/
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ldr r3, =0x40d @ On permission fault
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and r3, r1, r3
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cmp r3, #0x0d
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movne pc, lr
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mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR
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isb
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mrc p15, 0, r2, c7, c4, 0 @ Read the PAR
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and r3, r2, #0x7b @ On translation fault
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cmp r3, #0x0b
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movne pc, lr
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bic r1, r1, #0xf @ Fix up FSR FS[5:0]
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and r2, r2, #0x7e
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orr r1, r1, r2, LSR #1
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#endif
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mov pc, lr
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ENDPROC(v7_early_abort)
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