lib/Target/PowerPC/PPCFrameInfo.h

   1 //===-- PPCFrameInfo.h - Define TargetFrameInfo for PowerPC -----*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef POWERPC_FRAMEINFO_H
  14 #define POWERPC_FRAMEINFO_H
  15
  16 #include "PPC.h"
  17 #include "PPCSubtarget.h"
  18 #include "llvm/Target/TargetFrameInfo.h"
  19 #include "llvm/Target/TargetMachine.h"
  20 #include "llvm/ADT/STLExtras.h"
  21
  22 namespace llvm {
  23
  24 class PPCFrameInfo: public TargetFrameInfo {
  25   const TargetMachine &TM;
  26
  27 public:
  28   PPCFrameInfo(const TargetMachine &tm, bool LP64)
  29     : TargetFrameInfo(TargetFrameInfo::StackGrowsDown, 16, 0), TM(tm) {
  30   }
  31
  32   /// getReturnSaveOffset - Return the previous frame offset to save the
  33   /// return address.
  34   static unsigned getReturnSaveOffset(bool isPPC64, bool isDarwinABI) {
  35     if (isDarwinABI)
  36       return isPPC64 ? 16 : 8;
  37     // SVR4 ABI:
  38     return isPPC64 ? 16 : 4;
  39   }
  40
  41   /// getFramePointerSaveOffset - Return the previous frame offset to save the
  42   /// frame pointer.
  43   static unsigned getFramePointerSaveOffset(bool isPPC64, bool isDarwinABI) {
  44     // For the Darwin ABI:
  45     // Use the TOC save slot in the PowerPC linkage area for saving the frame
  46     // pointer (if needed.)  LLVM does not generate code that uses the TOC (R2
  47     // is treated as a caller saved register.)
  48     if (isDarwinABI)
  49       return isPPC64 ? 40 : 20;
  50
  51     // SVR4 ABI: First slot in the general register save area.
  52     return -4U;
  53   }
  54
  55   /// getLinkageSize - Return the size of the PowerPC ABI linkage area.
  56   ///
  57   static unsigned getLinkageSize(bool isPPC64, bool isDarwinABI) {
  58     if (isDarwinABI || isPPC64)
  59       return 6 * (isPPC64 ? 8 : 4);
  60
  61     // SVR4 ABI:
  62     return 8;
  63   }
  64
  65   /// getMinCallArgumentsSize - Return the size of the minium PowerPC ABI
  66   /// argument area.
  67   static unsigned getMinCallArgumentsSize(bool isPPC64, bool isDarwinABI) {
  68     // For the Darwin ABI / 64-bit SVR4 ABI:
  69     // The prolog code of the callee may store up to 8 GPR argument registers to
  70     // the stack, allowing va_start to index over them in memory if its varargs.
  71     // Because we cannot tell if this is needed on the caller side, we have to
  72     // conservatively assume that it is needed.  As such, make sure we have at
  73     // least enough stack space for the caller to store the 8 GPRs.
  74     if (isDarwinABI || isPPC64)
  75       return 8 * (isPPC64 ? 8 : 4);
  76
  77     // 32-bit SVR4 ABI:
  78     // There is no default stack allocated for the 8 first GPR arguments.
  79     return 0;
  80   }
  81
  82   /// getMinCallFrameSize - Return the minimum size a call frame can be using
  83   /// the PowerPC ABI.
  84   static unsigned getMinCallFrameSize(bool isPPC64, bool isDarwinABI) {
  85     // The call frame needs to be at least big enough for linkage and 8 args.
  86     return getLinkageSize(isPPC64, isDarwinABI) +
  87            getMinCallArgumentsSize(isPPC64, isDarwinABI);
  88   }
  89
  90   // With the SVR4 ABI, callee-saved registers have fixed offsets on the stack.
  91   const std::pair<unsigned, int> *
  92   getCalleeSavedSpillSlots(unsigned &NumEntries) const {
  93     // Early exit if not using the SVR4 ABI.
  94     if (!TM.getSubtarget<PPCSubtarget>().isSVR4ABI()) {
  95       NumEntries = 0;
  96       return 0;
  97     }
  98
  99     static const std::pair<unsigned, int> Offsets[] = {
 100       // Floating-point register save area offsets.
 101       std::pair<unsigned, int>(PPC::F31, -8),
 102       std::pair<unsigned, int>(PPC::F30, -16),
 103       std::pair<unsigned, int>(PPC::F29, -24),
 104       std::pair<unsigned, int>(PPC::F28, -32),
 105       std::pair<unsigned, int>(PPC::F27, -40),
 106       std::pair<unsigned, int>(PPC::F26, -48),
 107       std::pair<unsigned, int>(PPC::F25, -56),
 108       std::pair<unsigned, int>(PPC::F24, -64),
 109       std::pair<unsigned, int>(PPC::F23, -72),
 110       std::pair<unsigned, int>(PPC::F22, -80),
 111       std::pair<unsigned, int>(PPC::F21, -88),
 112       std::pair<unsigned, int>(PPC::F20, -96),
 113       std::pair<unsigned, int>(PPC::F19, -104),
 114       std::pair<unsigned, int>(PPC::F18, -112),
 115       std::pair<unsigned, int>(PPC::F17, -120),
 116       std::pair<unsigned, int>(PPC::F16, -128),
 117       std::pair<unsigned, int>(PPC::F15, -136),
 118       std::pair<unsigned, int>(PPC::F14, -144),
 119
 120       // General register save area offsets.
 121       std::pair<unsigned, int>(PPC::R31, -4),
 122       std::pair<unsigned, int>(PPC::R30, -8),
 123       std::pair<unsigned, int>(PPC::R29, -12),
 124       std::pair<unsigned, int>(PPC::R28, -16),
 125       std::pair<unsigned, int>(PPC::R27, -20),
 126       std::pair<unsigned, int>(PPC::R26, -24),
 127       std::pair<unsigned, int>(PPC::R25, -28),
 128       std::pair<unsigned, int>(PPC::R24, -32),
 129       std::pair<unsigned, int>(PPC::R23, -36),
 130       std::pair<unsigned, int>(PPC::R22, -40),
 131       std::pair<unsigned, int>(PPC::R21, -44),
 132       std::pair<unsigned, int>(PPC::R20, -48),
 133       std::pair<unsigned, int>(PPC::R19, -52),
 134       std::pair<unsigned, int>(PPC::R18, -56),
 135       std::pair<unsigned, int>(PPC::R17, -60),
 136       std::pair<unsigned, int>(PPC::R16, -64),
 137       std::pair<unsigned, int>(PPC::R15, -68),
 138       std::pair<unsigned, int>(PPC::R14, -72),
 139
 140       // CR save area offset.
 141       // FIXME SVR4: Disable CR save area for now.
 142 //      std::pair<unsigned, int>(PPC::CR2, -4),
 143 //      std::pair<unsigned, int>(PPC::CR3, -4),
 144 //      std::pair<unsigned, int>(PPC::CR4, -4),
 145 //      std::pair<unsigned, int>(PPC::CR2LT, -4),
 146 //      std::pair<unsigned, int>(PPC::CR2GT, -4),
 147 //      std::pair<unsigned, int>(PPC::CR2EQ, -4),
 148 //      std::pair<unsigned, int>(PPC::CR2UN, -4),
 149 //      std::pair<unsigned, int>(PPC::CR3LT, -4),
 150 //      std::pair<unsigned, int>(PPC::CR3GT, -4),
 151 //      std::pair<unsigned, int>(PPC::CR3EQ, -4),
 152 //      std::pair<unsigned, int>(PPC::CR3UN, -4),
 153 //      std::pair<unsigned, int>(PPC::CR4LT, -4),
 154 //      std::pair<unsigned, int>(PPC::CR4GT, -4),
 155 //      std::pair<unsigned, int>(PPC::CR4EQ, -4),
 156 //      std::pair<unsigned, int>(PPC::CR4UN, -4),
 157
 158       // VRSAVE save area offset.
 159       std::pair<unsigned, int>(PPC::VRSAVE, -4),
 160
 161       // Vector register save area
 162       std::pair<unsigned, int>(PPC::V31, -16),
 163       std::pair<unsigned, int>(PPC::V30, -32),
 164       std::pair<unsigned, int>(PPC::V29, -48),
 165       std::pair<unsigned, int>(PPC::V28, -64),
 166       std::pair<unsigned, int>(PPC::V27, -80),
 167       std::pair<unsigned, int>(PPC::V26, -96),
 168       std::pair<unsigned, int>(PPC::V25, -112),
 169       std::pair<unsigned, int>(PPC::V24, -128),
 170       std::pair<unsigned, int>(PPC::V23, -144),
 171       std::pair<unsigned, int>(PPC::V22, -160),
 172       std::pair<unsigned, int>(PPC::V21, -176),
 173       std::pair<unsigned, int>(PPC::V20, -192)
 174     };
 175
 176     static const std::pair<unsigned, int> Offsets64[] = {
 177       // Floating-point register save area offsets.
 178       std::pair<unsigned, int>(PPC::F31, -8),
 179       std::pair<unsigned, int>(PPC::F30, -16),
 180       std::pair<unsigned, int>(PPC::F29, -24),
 181       std::pair<unsigned, int>(PPC::F28, -32),
 182       std::pair<unsigned, int>(PPC::F27, -40),
 183       std::pair<unsigned, int>(PPC::F26, -48),
 184       std::pair<unsigned, int>(PPC::F25, -56),
 185       std::pair<unsigned, int>(PPC::F24, -64),
 186       std::pair<unsigned, int>(PPC::F23, -72),
 187       std::pair<unsigned, int>(PPC::F22, -80),
 188       std::pair<unsigned, int>(PPC::F21, -88),
 189       std::pair<unsigned, int>(PPC::F20, -96),
 190       std::pair<unsigned, int>(PPC::F19, -104),
 191       std::pair<unsigned, int>(PPC::F18, -112),
 192       std::pair<unsigned, int>(PPC::F17, -120),
 193       std::pair<unsigned, int>(PPC::F16, -128),
 194       std::pair<unsigned, int>(PPC::F15, -136),
 195       std::pair<unsigned, int>(PPC::F14, -144),
 196
 197       // General register save area offsets.
 198       // FIXME 64-bit SVR4: Are 32-bit registers actually allocated in 64-bit
 199       //                    mode?
 200       std::pair<unsigned, int>(PPC::R31, -4),
 201       std::pair<unsigned, int>(PPC::R30, -12),
 202       std::pair<unsigned, int>(PPC::R29, -20),
 203       std::pair<unsigned, int>(PPC::R28, -28),
 204       std::pair<unsigned, int>(PPC::R27, -36),
 205       std::pair<unsigned, int>(PPC::R26, -44),
 206       std::pair<unsigned, int>(PPC::R25, -52),
 207       std::pair<unsigned, int>(PPC::R24, -60),
 208       std::pair<unsigned, int>(PPC::R23, -68),
 209       std::pair<unsigned, int>(PPC::R22, -76),
 210       std::pair<unsigned, int>(PPC::R21, -84),
 211       std::pair<unsigned, int>(PPC::R20, -92),
 212       std::pair<unsigned, int>(PPC::R19, -100),
 213       std::pair<unsigned, int>(PPC::R18, -108),
 214       std::pair<unsigned, int>(PPC::R17, -116),
 215       std::pair<unsigned, int>(PPC::R16, -124),
 216       std::pair<unsigned, int>(PPC::R15, -132),
 217       std::pair<unsigned, int>(PPC::R14, -140),
 218
 219       std::pair<unsigned, int>(PPC::X31, -8),
 220       std::pair<unsigned, int>(PPC::X30, -16),
 221       std::pair<unsigned, int>(PPC::X29, -24),
 222       std::pair<unsigned, int>(PPC::X28, -32),
 223       std::pair<unsigned, int>(PPC::X27, -40),
 224       std::pair<unsigned, int>(PPC::X26, -48),
 225       std::pair<unsigned, int>(PPC::X25, -56),
 226       std::pair<unsigned, int>(PPC::X24, -64),
 227       std::pair<unsigned, int>(PPC::X23, -72),
 228       std::pair<unsigned, int>(PPC::X22, -80),
 229       std::pair<unsigned, int>(PPC::X21, -88),
 230       std::pair<unsigned, int>(PPC::X20, -96),
 231       std::pair<unsigned, int>(PPC::X19, -104),
 232       std::pair<unsigned, int>(PPC::X18, -112),
 233       std::pair<unsigned, int>(PPC::X17, -120),
 234       std::pair<unsigned, int>(PPC::X16, -128),
 235       std::pair<unsigned, int>(PPC::X15, -136),
 236       std::pair<unsigned, int>(PPC::X14, -144),
 237
 238       // CR save area offset.
 239       // FIXME SVR4: Disable CR save area for now.
 240 //      std::pair<unsigned, int>(PPC::CR2, -4),
 241 //      std::pair<unsigned, int>(PPC::CR3, -4),
 242 //      std::pair<unsigned, int>(PPC::CR4, -4),
 243 //      std::pair<unsigned, int>(PPC::CR2LT, -4),
 244 //      std::pair<unsigned, int>(PPC::CR2GT, -4),
 245 //      std::pair<unsigned, int>(PPC::CR2EQ, -4),
 246 //      std::pair<unsigned, int>(PPC::CR2UN, -4),
 247 //      std::pair<unsigned, int>(PPC::CR3LT, -4),
 248 //      std::pair<unsigned, int>(PPC::CR3GT, -4),
 249 //      std::pair<unsigned, int>(PPC::CR3EQ, -4),
 250 //      std::pair<unsigned, int>(PPC::CR3UN, -4),
 251 //      std::pair<unsigned, int>(PPC::CR4LT, -4),
 252 //      std::pair<unsigned, int>(PPC::CR4GT, -4),
 253 //      std::pair<unsigned, int>(PPC::CR4EQ, -4),
 254 //      std::pair<unsigned, int>(PPC::CR4UN, -4),
 255
 256       // VRSAVE save area offset.
 257       std::pair<unsigned, int>(PPC::VRSAVE, -4),
 258
 259       // Vector register save area
 260       std::pair<unsigned, int>(PPC::V31, -16),
 261       std::pair<unsigned, int>(PPC::V30, -32),
 262       std::pair<unsigned, int>(PPC::V29, -48),
 263       std::pair<unsigned, int>(PPC::V28, -64),
 264       std::pair<unsigned, int>(PPC::V27, -80),
 265       std::pair<unsigned, int>(PPC::V26, -96),
 266       std::pair<unsigned, int>(PPC::V25, -112),
 267       std::pair<unsigned, int>(PPC::V24, -128),
 268       std::pair<unsigned, int>(PPC::V23, -144),
 269       std::pair<unsigned, int>(PPC::V22, -160),
 270       std::pair<unsigned, int>(PPC::V21, -176),
 271       std::pair<unsigned, int>(PPC::V20, -192)
 272     };
 273
 274     if (TM.getSubtarget<PPCSubtarget>().isPPC64()) {
 275       NumEntries = array_lengthof(Offsets64);
 276
 277       return Offsets64;
 278     } else {
 279       NumEntries = array_lengthof(Offsets);
 280
 281       return Offsets;
 282     }
 283   }
 284 };
 285
 286 } // End llvm namespace
 287
 288 #endif