include/asm-arm/proc-armv/assembler.h

   1 /*
   2  * linux/asm-arm/proc-armv/assembler.h
   3  *
   4  * Copyright (C) 1996-2000 Russell King
   5  *
   6  * This file contains ARM processor specifics for
   7  * the ARM6 and better processors.
   8  */
   9 #define MODE_USR        USR_MODE
  10 #define MODE_FIQ        FIQ_MODE
  11 #define MODE_IRQ        IRQ_MODE
  12 #define MODE_SVC        SVC_MODE
  13
  14 #define DEFAULT_FIQ     MODE_FIQ
  15
  16 /*
  17  * LOADREGS - ldm with PC in register list (eg, ldmfd sp!, {pc})
  18  */
  19 #ifdef __STDC__
  20 #define LOADREGS(cond, base, reglist...)\
  21         ldm##cond       base,reglist
  22 #else
  23 #define LOADREGS(cond, base, reglist...)\
  24         ldm/**/cond     base,reglist
  25 #endif
  26
  27 /*
  28  * Build a return instruction for this processor type.
  29  */
  30 #define RETINSTR(instr, regs...)\
  31         instr   regs
  32
  33 /*
  34  * Save the current IRQ state and disable IRQs.  Note that this macro
  35  * assumes FIQs are enabled, and that the processor is in SVC mode.
  36  */
  37         .macro  save_and_disable_irqs, oldcpsr, temp
  38         mrs     \oldcpsr, cpsr
  39         mov     \temp, #I_BIT | MODE_SVC
  40         msr     cpsr_c, \temp
  41         .endm
  42
  43 /*
  44  * Restore interrupt state previously stored in a register.  We don't
  45  * guarantee that this will preserve the flags.
  46  */
  47         .macro  restore_irqs, oldcpsr
  48         msr     cpsr_c, \oldcpsr
  49         .endm
  50
  51 /*
  52  * These two are used to save LR/restore PC over a user-based access.
  53  * The old 26-bit architecture requires that we do.  On 32-bit
  54  * architecture, we can safely ignore this requirement.
  55  */
  56         .macro  save_lr
  57         .endm
  58
  59         .macro  restore_pc
  60         mov     pc, lr
  61         .endm
  62
  63 #define USER(x...)                              \
  64 9999:   x;                                      \
  65         .section __ex_table,"a";                \
  66         .align  3;                              \
  67         .long   9999b,9001f;                    \
  68         .previous
  69
  70