asm.h

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/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * 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.
 */
#ifndef __ASM_AVR32_ASM_H__
#define __ASM_AVR32_ASM_H__

#include <asm/sysreg.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>

#define mask_interrupts     ssrf    SYSREG_GM_OFFSET
#define mask_exceptions     ssrf    SYSREG_EM_OFFSET
#define unmask_interrupts   csrf    SYSREG_GM_OFFSET
#define unmask_exceptions   csrf    SYSREG_EM_OFFSET

#ifdef CONFIG_FRAME_POINTER
    .macro  save_fp
    st.w    --sp, r7
    .endm
    .macro  restore_fp
    ld.w    r7, sp++
    .endm
    .macro  zero_fp
    mov r7, 0
    .endm
#else
    .macro  save_fp
    .endm
    .macro  restore_fp
    .endm
    .macro  zero_fp
    .endm
#endif
    .macro  get_thread_info reg
    mov	\reg, sp
    andl	\reg, ~(THREAD_SIZE - 1) & 0xffff
    .endm

    /* Save and restore registers */
    .macro  save_min sr, tmp=lr
    pushm   lr
    mfsr    \tmp, \sr
    zero_fp
    st.w    --sp, \tmp
    .endm

    .macro  restore_min sr, tmp=lr
    ld.w    \tmp, sp++
    mtsr    \sr, \tmp
    popm    lr
    .endm

    .macro  save_half sr, tmp=lr
    save_fp
    pushm   r8-r9,r10,r11,r12,lr
    zero_fp
    mfsr    \tmp, \sr
    st.w    --sp, \tmp
    .endm

    .macro  restore_half sr, tmp=lr
    ld.w    \tmp, sp++
    mtsr    \sr, \tmp
    popm    r8-r9,r10,r11,r12,lr
    restore_fp
    .endm

    .macro  save_full_user sr, tmp=lr
    stmts   --sp, r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,sp,lr
    st.w    --sp, lr
    zero_fp
    mfsr    \tmp, \sr
    st.w    --sp, \tmp
    .endm

    .macro  restore_full_user sr, tmp=lr
    ld.w    \tmp, sp++
    mtsr    \sr, \tmp
    ld.w    lr, sp++
    ldmts   sp++, r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,sp,lr
    .endm

    /* uaccess macros */
    .macro branch_if_kernel scratch, label
    get_thread_info \scratch
    ld.w    \scratch, \scratch[TI_flags]
    bld \scratch, TIF_USERSPACE
    brcc    \label
    .endm

    .macro ret_if_privileged scratch, addr, size, ret
    sub \scratch, \size, 1
    add \scratch, \addr
    retcs   \ret
    retmi   \ret
    .endm

#endif /* __ASM_AVR32_ASM_H__ */