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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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da74047257
Tail-call the main C data abort handler code from the per-CPU helper code. Update the comments in the code wrt the new calling and return register state. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
52 lines
1.1 KiB
ArmAsm
52 lines
1.1 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 = pt_regs
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* : r4 = aborted context pc
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* : r5 = aborted context psr
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*
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* Returns : r4 - r11, r13 preserved
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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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bne do_DataAbort
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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, ip, c7, c4, 0 @ Read the PAR
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and r3, ip, #0x7b @ On translation fault
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cmp r3, #0x0b
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bne do_DataAbort
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bic r1, r1, #0xf @ Fix up FSR FS[5:0]
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and ip, ip, #0x7e
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orr r1, r1, ip, LSR #1
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#endif
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b do_DataAbort
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ENDPROC(v7_early_abort)
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