arch/avr32/include/asm/asm.h

   1 /*
   2  * Copyright (C) 2004-2006 Atmel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #ifndef __ASM_AVR32_ASM_H__
   9 #define __ASM_AVR32_ASM_H__
  10
  11 #include <asm/sysreg.h>
  12 #include <asm/asm-offsets.h>
  13 #include <asm/thread_info.h>
  14
  15 #define mask_interrupts         ssrf    SYSREG_GM_OFFSET
  16 #define mask_exceptions         ssrf    SYSREG_EM_OFFSET
  17 #define unmask_interrupts       csrf    SYSREG_GM_OFFSET
  18 #define unmask_exceptions       csrf    SYSREG_EM_OFFSET
  19
  20 #ifdef CONFIG_FRAME_POINTER
  21         .macro  save_fp
  22         st.w    --sp, r7
  23         .endm
  24         .macro  restore_fp
  25         ld.w    r7, sp++
  26         .endm
  27         .macro  zero_fp
  28         mov     r7, 0
  29         .endm
  30 #else
  31         .macro  save_fp
  32         .endm
  33         .macro  restore_fp
  34         .endm
  35         .macro  zero_fp
  36         .endm
  37 #endif
  38         .macro  get_thread_info reg
  39         mov     \reg, sp
  40         andl    \reg, ~(THREAD_SIZE - 1) & 0xffff
  41         .endm
  42
  43         /* Save and restore registers */
  44         .macro  save_min sr, tmp=lr
  45         pushm   lr
  46         mfsr    \tmp, \sr
  47         zero_fp
  48         st.w    --sp, \tmp
  49         .endm
  50
  51         .macro  restore_min sr, tmp=lr
  52         ld.w    \tmp, sp++
  53         mtsr    \sr, \tmp
  54         popm    lr
  55         .endm
  56
  57         .macro  save_half sr, tmp=lr
  58         save_fp
  59         pushm   r8-r9,r10,r11,r12,lr
  60         zero_fp
  61         mfsr    \tmp, \sr
  62         st.w    --sp, \tmp
  63         .endm
  64
  65         .macro  restore_half sr, tmp=lr
  66         ld.w    \tmp, sp++
  67         mtsr    \sr, \tmp
  68         popm    r8-r9,r10,r11,r12,lr
  69         restore_fp
  70         .endm
  71
  72         .macro  save_full_user sr, tmp=lr
  73         stmts   --sp, r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,sp,lr
  74         st.w    --sp, lr
  75         zero_fp
  76         mfsr    \tmp, \sr
  77         st.w    --sp, \tmp
  78         .endm
  79
  80         .macro  restore_full_user sr, tmp=lr
  81         ld.w    \tmp, sp++
  82         mtsr    \sr, \tmp
  83         ld.w    lr, sp++
  84         ldmts   sp++, r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,sp,lr
  85         .endm
  86
  87         /* uaccess macros */
  88         .macro branch_if_kernel scratch, label
  89         get_thread_info \scratch
  90         ld.w    \scratch, \scratch[TI_flags]
  91         bld     \scratch, TIF_USERSPACE
  92         brcc    \label
  93         .endm
  94
  95         .macro ret_if_privileged scratch, addr, size, ret
  96         sub     \scratch, \size, 1
  97         add     \scratch, \addr
  98         retcs   \ret
  99         retmi   \ret
 100         .endm
 101
 102 #endif /* __ASM_AVR32_ASM_H__ */