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- /* SPDX-License-Identifier: GPL-2.0 */
- #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
- uaccess_disable ip @ disable userspace access
- /*
- * 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)
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