include/asm-arm26/assembler.h

   1 /*
   2  * linux/asm/assembler.h
   3  *
   4  * This file contains arm architecture specific defines
   5  * for the different processors.
   6  *
   7  * Do not include any C declarations in this file - it is included by
   8  * assembler source.
   9  */
  10 #ifndef __ASSEMBLY__
  11 #error "Only include this from assembly code"
  12 #endif
  13
  14 /*
  15  * Endian independent macros for shifting bytes within registers.
  16  */
  17 #define pull            lsr
  18 #define push            lsl
  19 #define byte(x)         (x*8)
  20
  21 #ifdef __STDC__
  22 #define LOADREGS(cond, base, reglist...)\
  23         ldm##cond       base,reglist^
  24
  25 #define RETINSTR(instr, regs...)\
  26         instr##s        regs
  27 #else
  28 #define LOADREGS(cond, base, reglist...)\
  29         ldm/**/cond     base,reglist^
  30
  31 #define RETINSTR(instr, regs...)\
  32         instr/**/s      regs
  33 #endif
  34
  35 #define MODENOP\
  36         mov     r0, r0
  37
  38 #define MODE(savereg,tmpreg,mode) \
  39         mov     savereg, pc; \
  40         bic     tmpreg, savereg, $0x0c000003; \
  41         orr     tmpreg, tmpreg, $mode; \
  42         teqp    tmpreg, $0
  43
  44 #define RESTOREMODE(savereg) \
  45         teqp    savereg, $0
  46
  47 #define SAVEIRQS(tmpreg)
  48
  49 #define RESTOREIRQS(tmpreg)
  50
  51 #define DISABLEIRQS(tmpreg)\
  52         teqp    pc, $0x08000003
  53
  54 #define ENABLEIRQS(tmpreg)\
  55         teqp    pc, $0x00000003
  56
  57 #define USERMODE(tmpreg)\
  58         teqp    pc, $0x00000000;\
  59         mov     r0, r0
  60
  61 #define SVCMODE(tmpreg)\
  62         teqp    pc, $0x00000003;\
  63         mov     r0, r0
  64
  65
  66 /*
  67  * Save the current IRQ state and disable IRQs
  68  * Note that this macro assumes FIQs are enabled, and
  69  * that the processor is in SVC mode.
  70  */
  71         .macro  save_and_disable_irqs, oldcpsr, temp
  72   mov \oldcpsr, pc
  73   orr \temp, \oldcpsr, #0x08000000
  74   teqp \temp, #0
  75   .endm
  76
  77 /*
  78  * Restore interrupt state previously stored in
  79  * a register
  80  * ** Actually do nothing on Arc - hope that the caller uses a MOVS PC soon
  81  * after!
  82  */
  83         .macro  restore_irqs, oldcpsr
  84   @ This be restore_irqs
  85   .endm
  86
  87 /*
  88  * These two are used to save LR/restore PC over a user-based access.
  89  * The old 26-bit architecture requires that we save lr (R14)
  90  */
  91         .macro  save_lr
  92         str     lr, [sp, #-4]!
  93         .endm
  94
  95         .macro  restore_pc
  96         ldmfd   sp!, {pc}^
  97         .endm
  98
  99 #define USER(x...)                              \
 100 9999:   x;                                      \
 101         .section __ex_table,"a";                \
 102         .align  3;                              \
 103         .long   9999b,9001f;                    \
 104         .previous
 105
 106