Reland "MIPS: Add support for arch. revision 6 to mips32 port."

build/toolchain.gypi

 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 40 matching lines @@
 
     # Similar to vfp but on MIPS.
     'v8_can_use_fpu_instructions%': 'true',
 
     # Similar to the ARM hard float ABI but on MIPS.
     'v8_use_mips_abi_hardfloat%': 'true',
 
     # Default arch variant for MIPS.
     'mips_arch_variant%': 'r2',
 
+    # Possible values fp32, fp64, fpxx.
+    # fp32 - 32 32-bit FPU registers are available, doubles are placed in
+    #        register pairs.
+    # fp64 - 32 64-bit FPU registers are available.
+    # fpxx - compatibility mode, it chooses fp32 or fp64 depending on runtime
+    #        detection
+    'mips_fpu_mode%': 'fp32',
+
     'v8_enable_backtrace%': 0,
 
     # Enable profiling support. Only required on Windows.
     'v8_enable_prof%': 0,
 
     # Some versions of GCC 4.5 seem to need -fno-strict-aliasing.
     'v8_no_strict_aliasing%': 0,
 
     # Chrome needs this definition unconditionally. For standalone V8 builds,
     # it's handled in build/standalone.gypi.
@@ skipping 194 matching lines @@
                 'cflags': ['-EB'],
                 'ldflags': ['-EB'],
                 'conditions': [
                   [ 'v8_use_mips_abi_hardfloat=="true"', {
                     'cflags': ['-mhard-float'],
                     'ldflags': ['-mhard-float'],
                   }, {
                     'cflags': ['-msoft-float'],
                     'ldflags': ['-msoft-float'],
                   }],
+                  ['mips_fpu_mode=="fp64"', {
+                    'cflags': ['-mfp64'],
+                  }],
+                  ['mips_fpu_mode=="fpxx"', {
+                    'cflags': ['-mfpxx'],
+                  }],
+                  ['mips_fpu_mode=="fp32"', {
+                    'cflags': ['-mfp32'],
+                  }],
+                  ['mips_arch_variant=="r6"', {
+                    'cflags!': ['-mfp32'],
+                    'cflags': ['-mips32r6', '-Wa,-mips32r6'],
+                    'ldflags': [
+                      '-mips32r6',
+                      '-Wl,--dynamic-linker=$(LDSO_PATH)',
+                      '-Wl,--rpath=$(LD_R_PATH)',
+                    ],
+                  }],
                   ['mips_arch_variant=="r2"', {
                     'cflags': ['-mips32r2', '-Wa,-mips32r2'],
                   }],
                   ['mips_arch_variant=="r1"', {
+                    'cflags!': ['-mfp64'],
+                    'cflags': ['-mips32', '-Wa,-mips32'],
+                  }],
+                  ['mips_arch_variant=="rx"', {
+                    'cflags!': ['-mfp64'],
                     'cflags': ['-mips32', '-Wa,-mips32'],
                   }],
                 ],
               }],
             ],
           }],
           [ 'v8_can_use_fpu_instructions=="true"', {
             'defines': [
               'CAN_USE_FPU_INSTRUCTIONS',
             ],
           }],
           [ 'v8_use_mips_abi_hardfloat=="true"', {
             'defines': [
               '__mips_hard_float=1',
               'CAN_USE_FPU_INSTRUCTIONS',
             ],
           }, {
             'defines': [
               '__mips_soft_float=1'
             ],
           }],
+          ['mips_arch_variant=="rx"', {
+            'defines': [
+              '_MIPS_ARCH_MIPS32RX',
+              'FPU_MODE_FPXX',
+            ],
+          }],
+          ['mips_arch_variant=="r6"', {
+            'defines': [
+              '_MIPS_ARCH_MIPS32R6',
+              'FPU_MODE_FP64',
+            ],
+          }],
           ['mips_arch_variant=="r2"', {
             'defines': ['_MIPS_ARCH_MIPS32R2',],
+            'conditions': [
+              ['mips_fpu_mode=="fp64"', {
+                'defines': ['FPU_MODE_FP64',],
+              }],
+              ['mips_fpu_mode=="fpxx"', {
+                'defines': ['FPU_MODE_FPXX',],
+              }],
+              ['mips_fpu_mode=="fp32"', {
+                'defines': ['FPU_MODE_FP32',],
+              }],
+            ],
+          }],
+          ['mips_arch_variant=="r1"', {
+            'defines': ['FPU_MODE_FP32',],
           }],
         ],
       }],  # v8_target_arch=="mips"
       ['v8_target_arch=="mipsel"', {
         'defines': [
           'V8_TARGET_ARCH_MIPS',
         ],
         'conditions': [
           ['v8_target_arch==target_arch and android_webview_build==0', {
             # Target built with a Mips CXX compiler.
             'target_conditions': [
               ['_toolset=="target"', {
                 'cflags': ['-EL'],
                 'ldflags': ['-EL'],
                 'conditions': [
                   [ 'v8_use_mips_abi_hardfloat=="true"', {
                     'cflags': ['-mhard-float'],
                     'ldflags': ['-mhard-float'],
                   }, {
                     'cflags': ['-msoft-float'],
                     'ldflags': ['-msoft-float'],
                   }],
+                  ['mips_fpu_mode=="fp64"', {
+                    'cflags': ['-mfp64'],
+                  }],
+                  ['mips_fpu_mode=="fpxx"', {
+                    'cflags': ['-mfpxx'],
+                  }],
+                  ['mips_fpu_mode=="fp32"', {
+                    'cflags': ['-mfp32'],
+                  }],
+                  ['mips_arch_variant=="r6"', {
+                    'cflags!': ['-mfp32'],
+                    'cflags': ['-mips32r6', '-Wa,-mips32r6'],
+                    'ldflags': [
+                      '-mips32r6',
+                      '-Wl,--dynamic-linker=$(LDSO_PATH)',
+                      '-Wl,--rpath=$(LD_R_PATH)',
+                    ],
+                  }],
                   ['mips_arch_variant=="r2"', {
                     'cflags': ['-mips32r2', '-Wa,-mips32r2'],
                   }],
                   ['mips_arch_variant=="r1"', {
+                    'cflags!': ['-mfp64'],
                     'cflags': ['-mips32', '-Wa,-mips32'],
-                 }],
+                  }],
+                  ['mips_arch_variant=="rx"', {
+                    'cflags!': ['-mfp64'],
+                    'cflags': ['-mips32', '-Wa,-mips32'],
+                  }],
                   ['mips_arch_variant=="loongson"', {
+                    'cflags!': ['-mfp64'],
                     'cflags': ['-mips3', '-Wa,-mips3'],
                   }],
                 ],
               }],
             ],
           }],
           [ 'v8_can_use_fpu_instructions=="true"', {
             'defines': [
               'CAN_USE_FPU_INSTRUCTIONS',
             ],
           }],
           [ 'v8_use_mips_abi_hardfloat=="true"', {
             'defines': [
               '__mips_hard_float=1',
               'CAN_USE_FPU_INSTRUCTIONS',
             ],
           }, {
             'defines': [
               '__mips_soft_float=1'
             ],
           }],
+          ['mips_arch_variant=="rx"', {
+            'defines': [
+              '_MIPS_ARCH_MIPS32RX',
+              'FPU_MODE_FPXX',
+            ],
+          }],
+          ['mips_arch_variant=="r6"', {
+            'defines': [
+              '_MIPS_ARCH_MIPS32R6',
+               'FPU_MODE_FP64',
+            ],
+          }],
           ['mips_arch_variant=="r2"', {
             'defines': ['_MIPS_ARCH_MIPS32R2',],
+            'conditions': [
+              ['mips_fpu_mode=="fp64"', {
+                'defines': ['FPU_MODE_FP64',],
+              }],
+              ['mips_fpu_mode=="fpxx"', {
+                'defines': ['FPU_MODE_FPXX',],
+              }],
+              ['mips_fpu_mode=="fp32"', {
+                'defines': ['FPU_MODE_FP32',],
+              }],
+            ],
+          }],
+          ['mips_arch_variant=="r1"', {
+            'defines': ['FPU_MODE_FP32',],
           }],
           ['mips_arch_variant=="loongson"', {
-            'defines': ['_MIPS_ARCH_LOONGSON',],
+            'defines': [
+              '_MIPS_ARCH_LOONGSON',
+              'FPU_MODE_FP32',
+            ],
           }],
         ],
       }],  # v8_target_arch=="mipsel"
       ['v8_target_arch=="mips64el"', {
         'defines': [
           'V8_TARGET_ARCH_MIPS64',
         ],
         'conditions': [
           ['v8_target_arch==target_arch and android_webview_build==0', {
             # Target built with a Mips CXX compiler.
@@ skipping 474 matching lines @@
                 'OptimizeReferences': '2',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }