include/asm-arm/assembler.h

   1 /*
   2  *  linux/include/asm-arm/assembler.h
   3  *
   4  *  Copyright (C) 1996-2000 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  This file contains arm architecture specific defines
  11  *  for the different processors.
  12  *
  13  *  Do not include any C declarations in this file - it is included by
  14  *  assembler source.
  15  */
  16 #ifndef __ASSEMBLY__
  17 #error "Only include this from assembly code"
  18 #endif
  19
  20 #include <asm/ptrace.h>
  21
  22 /*
  23  * Endian independent macros for shifting bytes within registers.
  24  */
  25 #ifndef __ARMEB__
  26 #define pull            lsr
  27 #define push            lsl
  28 #define get_byte_0      lsl #0
  29 #define get_byte_1      lsr #8
  30 #define get_byte_2      lsr #16
  31 #define get_byte_3      lsr #24
  32 #define put_byte_0      lsl #0
  33 #define put_byte_1      lsl #8
  34 #define put_byte_2      lsl #16
  35 #define put_byte_3      lsl #24
  36 #else
  37 #define pull            lsl
  38 #define push            lsr
  39 #define get_byte_0      lsr #24
  40 #define get_byte_1      lsr #16
  41 #define get_byte_2      lsr #8
  42 #define get_byte_3      lsl #0
  43 #define put_byte_0      lsl #24
  44 #define put_byte_1      lsl #16
  45 #define put_byte_2      lsl #8
  46 #define put_byte_3      lsl #0
  47 #endif
  48
  49 /*
  50  * Data preload for architectures that support it
  51  */
  52 #if __LINUX_ARM_ARCH__ >= 5
  53 #define PLD(code...)    code
  54 #else
  55 #define PLD(code...)
  56 #endif
  57
  58 /*
  59  * Enable and disable interrupts
  60  */
  61 #if __LINUX_ARM_ARCH__ >= 6
  62         .macro  disable_irq
  63         cpsid   i
  64         .endm
  65
  66         .macro  enable_irq
  67         cpsie   i
  68         .endm
  69 #else
  70         .macro  disable_irq
  71         msr     cpsr_c, #PSR_I_BIT | SVC_MODE
  72         .endm
  73
  74         .macro  enable_irq
  75         msr     cpsr_c, #SVC_MODE
  76         .endm
  77 #endif
  78
  79 /*
  80  * Save the current IRQ state and disable IRQs.  Note that this macro
  81  * assumes FIQs are enabled, and that the processor is in SVC mode.
  82  */
  83         .macro  save_and_disable_irqs, oldcpsr
  84         mrs     \oldcpsr, cpsr
  85         disable_irq
  86         .endm
  87
  88 /*
  89  * Restore interrupt state previously stored in a register.  We don't
  90  * guarantee that this will preserve the flags.
  91  */
  92         .macro  restore_irqs, oldcpsr
  93         msr     cpsr_c, \oldcpsr
  94         .endm
  95
  96 #define USER(x...)                              \
  97 9999:   x;                                      \
  98         .section __ex_table,"a";                \
  99         .align  3;                              \
 100         .long   9999b,9001f;                    \
 101         .previous