ArmPkg/Include/AsmMacroIoLibV8.h

   1 /** @file
   2   Macros to work around lack of Clang support for LDR register, =expr
   3
   4   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   5   Portions copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>
   6
   7   This program and the accompanying materials
   8   are licensed and made available under the terms and conditions of the BSD License
   9   which accompanies this distribution.  The full text of the license may be found at
  10   http://opensource.org/licenses/bsd-license.php
  11
  12   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14
  15 **/
  16
  17
  18 #ifndef __MACRO_IO_LIBV8_H__
  19 #define __MACRO_IO_LIBV8_H__
  20
  21 #define SetPrimaryStack(StackTop, GlobalSize, Tmp, Tmp1)  \
  22   ands    Tmp, GlobalSize, #15        ;                   \
  23   mov     Tmp1, #16                   ;                   \
  24   sub     Tmp1, Tmp1, Tmp             ;                   \
  25   csel    Tmp, Tmp1, Tmp, ne          ;                   \
  26   add     GlobalSize, GlobalSize, Tmp ;                   \
  27   sub     sp, StackTop, GlobalSize    ;                   \
  28                                       ;                   \
  29   mov     Tmp, sp                     ;                   \
  30   mov     GlobalSize, #0x0            ;                   \
  31 _SetPrimaryStackInitGlobals:          ;                   \
  32   cmp     Tmp, StackTop               ;                   \
  33   b.eq    _SetPrimaryStackEnd         ;                   \
  34   str     GlobalSize, [Tmp], #8       ;                   \
  35   b       _SetPrimaryStackInitGlobals ;                   \
  36 _SetPrimaryStackEnd:
  37
  38 // Initialize the Global Variable with '0'
  39 #define InitializePrimaryStack(GlobalSize, Tmp1, Tmp2) \
  40   and     Tmp1, GlobalSize, #15       ;             \
  41   mov     Tmp2, #16                   ;             \
  42   sub     Tmp2, Tmp2, Tmp1            ;             \
  43   add     GlobalSize, GlobalSize, Tmp2 ;            \
  44                                       ;             \
  45   mov     Tmp1, sp                    ;             \
  46   sub     sp, sp, GlobalSize          ;             \
  47   mov     GlobalSize, #0x0            ;             \
  48 _InitializePrimaryStackLoop:          ;             \
  49   mov     Tmp2, sp                    ;             \
  50   cmp     Tmp1, Tmp2                  ;             \
  51   bls     _InitializePrimaryStackEnd  ;             \
  52   str     GlobalSize, [Tmp1, #-8]!    ;             \
  53   b       _InitializePrimaryStackLoop ;             \
  54 _InitializePrimaryStackEnd:
  55
  56 // CurrentEL : 0xC = EL3; 8 = EL2; 4 = EL1
  57 // This only selects between EL1 and EL2, else we die.
  58 // Provide the Macro with a safe temp xreg to use.
  59 #define EL1_OR_EL2(SAFE_XREG)        \
  60         mrs    SAFE_XREG, CurrentEL ;\
  61         cmp    SAFE_XREG, #0x8      ;\
  62         b.eq   2f                   ;\
  63         cmp    SAFE_XREG, #0x4      ;\
  64         b.ne   .                    ;// We should never get here
  65 // EL1 code starts here
  66
  67 // CurrentEL : 0xC = EL3; 8 = EL2; 4 = EL1
  68 // This only selects between EL1 and EL2 and EL3, else we die.
  69 // Provide the Macro with a safe temp xreg to use.
  70 #define EL1_OR_EL2_OR_EL3(SAFE_XREG) \
  71         mrs    SAFE_XREG, CurrentEL ;\
  72         cmp    SAFE_XREG, #0xC      ;\
  73         b.eq   3f                   ;\
  74         cmp    SAFE_XREG, #0x8      ;\
  75         b.eq   2f                   ;\
  76         cmp    SAFE_XREG, #0x4      ;\
  77         b.ne   .                    ;// We should never get here
  78 // EL1 code starts here
  79 #if defined(__clang__)
  80
  81 // load x0 with _Data
  82 #define LoadConstant(_Data)              \
  83   ldr  x0, 1f                          ; \
  84   b    2f                              ; \
  85 .align(8)                              ; \
  86 1:                                       \
  87   .8byte (_Data)                       ; \
  88 2:
  89
  90 // load _Reg with _Data
  91 #define LoadConstantToReg(_Data, _Reg)    \
  92   ldr  _Reg, 1f                         ; \
  93   b    2f                               ; \
  94 .align(8)                               ; \
  95 1:                                        \
  96   .8byte (_Data)                        ; \
  97 2:
  98
  99 #elif defined (__GNUC__)
 100
 101 #define LoadConstant(Data) \
 102   ldr  x0, =Data
 103
 104 #define LoadConstantToReg(Data, Reg) \
 105   ldr  Reg, =Data
 106
 107 #endif // __GNUC__
 108
 109 #endif // __MACRO_IO_LIBV8_H__
 110