LXR linux/arch/arm/mm/abort-ev5t.S

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#include <linux/linkage.h>
   3#include <asm/assembler.h>
   4#include "abort-macro.S"
   5/*
   6 * Function: v5t_early_abort
   7 *
   8 * Params  : r2 = pt_regs
   9 *         : r4 = aborted context pc
  10 *         : r5 = aborted context psr
  11 *
  12 * Returns : r4 - r11, r13 preserved
  13 *
  14 * Purpose : obtain information about current aborted instruction.
  15 * Note: we read user space.  This means we might cause a data
  16 * abort here if the I-TLB and D-TLB aren't seeing the same
  17 * picture.  Unfortunately, this does happen.  We live with it.
  18 */
  19        .align  5
  20ENTRY(v5t_early_abort)
  21        mrc     p15, 0, r1, c5, c0, 0           @ get FSR
  22        mrc     p15, 0, r0, c6, c0, 0           @ get FAR
  23        do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3
  24        ldreq   r3, [r4]                        @ read aborted ARM instruction
  25        uaccess_disable ip                      @ disable user access
  26        bic     r1, r1, #1 << 11                @ clear bits 11 of FSR
  27        teq_ldrd tmp=ip, insn=r3                @ insn was LDRD?
  28        beq     do_DataAbort                    @ yes
  29        tst     r3, #1 << 20                    @ check write
  30        orreq   r1, r1, #1 << 11
  31        b       do_DataAbort
  32