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-rw-r--r--kernel/arch/arm/mm/abort-ev7.S45
1 files changed, 45 insertions, 0 deletions
diff --git a/kernel/arch/arm/mm/abort-ev7.S b/kernel/arch/arm/mm/abort-ev7.S
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+++ b/kernel/arch/arm/mm/abort-ev7.S
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+#include <linux/linkage.h>
+#include <asm/assembler.h>
+/*
+ * Function: v7_early_abort
+ *
+ * Params : r2 = pt_regs
+ * : r4 = aborted context pc
+ * : r5 = aborted context psr
+ *
+ * Returns : r4 - r11, r13 preserved
+ *
+ * Purpose : obtain information about current aborted instruction.
+ */
+ .align 5
+ENTRY(v7_early_abort)
+ mrc p15, 0, r1, c5, c0, 0 @ get FSR
+ mrc p15, 0, r0, c6, c0, 0 @ get FAR
+
+ /*
+ * V6 code adjusts the returned DFSR.
+ * New designs should not need to patch up faults.
+ */
+
+#if defined(CONFIG_VERIFY_PERMISSION_FAULT)
+ /*
+ * Detect erroneous permission failures and fix
+ */
+ ldr r3, =0x40d @ On permission fault
+ and r3, r1, r3
+ cmp r3, #0x0d
+ bne do_DataAbort
+
+ mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR
+ isb
+ mrc p15, 0, ip, c7, c4, 0 @ Read the PAR
+ and r3, ip, #0x7b @ On translation fault
+ cmp r3, #0x0b
+ bne do_DataAbort
+ bic r1, r1, #0xf @ Fix up FSR FS[5:0]
+ and ip, ip, #0x7e
+ orr r1, r1, ip, LSR #1
+#endif
+
+ b do_DataAbort
+ENDPROC(v7_early_abort)