cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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abort-ev4.S (871B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#include <linux/linkage.h>
      3#include <asm/assembler.h>
      4/*
      5 * Function: v4_early_abort
      6 *
      7 * Params  : r2 = pt_regs
      8 *	   : r4 = aborted context pc
      9 *	   : r5 = aborted context psr
     10 *
     11 * Returns : r4 - r11, r13 preserved
     12 *
     13 * Purpose : obtain information about current aborted instruction.
     14 * Note: we read user space.  This means we might cause a data
     15 * abort here if the I-TLB and D-TLB aren't seeing the same
     16 * picture.  Unfortunately, this does happen.  We live with it.
     17 */
     18	.align	5
     19ENTRY(v4_early_abort)
     20	mrc	p15, 0, r1, c5, c0, 0		@ get FSR
     21	mrc	p15, 0, r0, c6, c0, 0		@ get FAR
     22	ldr	r3, [r4]			@ read aborted ARM instruction
     23	uaccess_disable ip			@ disable userspace access
     24	bic	r1, r1, #1 << 11 | 1 << 10	@ clear bits 11 and 10 of FSR
     25	tst	r3, #1 << 20			@ L = 1 -> write?
     26	orreq	r1, r1, #1 << 11		@ yes.
     27	b	do_DataAbort