assembler.h

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/*
 * Based on arch/arm/include/asm/assembler.h
 *
 * Copyright (C) 1996-2000 Russell King
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASSEMBLY__
#error "Only include this from assembly code"
#endif

#include <asm/ptrace.h>

/*
 * Stack pushing/popping (register pairs only). Equivalent to store decrement
 * before, load increment after.
 */
    .macro  push, xreg1, xreg2
    stp	\xreg1, \xreg2, [sp, #-16]!
    .endm

    .macro  pop, xreg1, xreg2
    ldp	\xreg1, \xreg2, [sp], #16
    .endm

/*
 * Enable and disable interrupts.
 */
    .macro  disable_irq
    msr daifset, #2
    .endm

    .macro  enable_irq
    msr daifclr, #2
    .endm

/*
 * Save/disable and restore interrupts.
 */
    .macro  save_and_disable_irqs, olddaif
    mrs	\olddaif, daif
    disable_irq
    .endm

    .macro  restore_irqs, olddaif
    msr daif, \olddaif
    .endm

/*
 * Enable and disable debug exceptions.
 */
    .macro  disable_dbg
    msr daifset, #8
    .endm

    .macro  enable_dbg
    msr daifclr, #8
    .endm

    .macro  disable_step, tmp
    mrs	\tmp, mdscr_el1
    bic	\tmp, \tmp, #1
    msr mdscr_el1, \tmp
    .endm

    .macro  enable_step, tmp
    mrs	\tmp, mdscr_el1
    orr	\tmp, \tmp, #1
    msr mdscr_el1, \tmp
    .endm

    .macro  enable_dbg_if_not_stepping, tmp
    mrs	\tmp, mdscr_el1
    tbnz	\tmp, #1, 9990f
    enable_dbg
9990:
    .endm

/*
 * SMP data memory barrier
 */
    .macro  smp_dmb, opt
#ifdef CONFIG_SMP
    dmb \opt
#endif
    .endm

#define USER(l, x...)               \
9999:   x;                  \
    .section __ex_table,"a";        \
    .align  3;              \
    .quad   9999b,l;            \
    .previous

/*
 * Register aliases.
 */
lr  .req    x30     // link register