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111
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1 /* Common hooks for IBM S/390 and zSeries.
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2 Copyright (C) 1999-2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "diagnostic-core.h"
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24 #include "tm.h"
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25 #include "common/common-target.h"
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26 #include "common/common-target-def.h"
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27 #include "opts.h"
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28 #include "flags.h"
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29
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30 EXPORTED_CONST int processor_flags_table[] =
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31 {
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32 /* g5 */ PF_IEEE_FLOAT,
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33 /* g6 */ PF_IEEE_FLOAT,
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34 /* z900 */ PF_IEEE_FLOAT | PF_ZARCH,
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35 /* z990 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT,
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36 /* z9-109 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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37 | PF_EXTIMM,
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38 /* z9-ec */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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39 | PF_EXTIMM | PF_DFP,
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40 /* z10 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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41 | PF_EXTIMM | PF_DFP | PF_Z10,
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42 /* z196 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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43 | PF_EXTIMM | PF_DFP | PF_Z10 | PF_Z196,
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44 /* zEC12 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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45 | PF_EXTIMM | PF_DFP | PF_Z10 | PF_Z196 | PF_ZEC12 | PF_TX,
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46 /* z13 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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47 | PF_EXTIMM | PF_DFP | PF_Z10 | PF_Z196 | PF_ZEC12 | PF_TX
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48 | PF_Z13 | PF_VX,
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49 /* arch12 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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50 | PF_EXTIMM | PF_DFP | PF_Z10 | PF_Z196 | PF_ZEC12 | PF_TX
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51 | PF_Z13 | PF_VX | PF_VXE | PF_ARCH12
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52 };
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53
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54 /* Change optimizations to be performed, depending on the
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55 optimization level. */
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56
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57 static const struct default_options s390_option_optimization_table[] =
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58 {
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59 { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
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60
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61 /* Enable -fsched-pressure by default when optimizing. */
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62 { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
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63
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64 /* ??? There are apparently still problems with -fcaller-saves. */
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65 { OPT_LEVELS_ALL, OPT_fcaller_saves, NULL, 0 },
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66
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67 /* Use MVCLE instructions to decrease code size if requested. */
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68 { OPT_LEVELS_SIZE, OPT_mmvcle, NULL, 1 },
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69
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70 { OPT_LEVELS_NONE, 0, NULL, 0 }
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71 };
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72
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73 /* Implement TARGET_OPTION_INIT_STRUCT. */
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74
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75 static void
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76 s390_option_init_struct (struct gcc_options *opts)
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77 {
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78 /* By default, always emit DWARF-2 unwind info. This allows debugging
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79 without maintaining a stack frame back-chain. */
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80 opts->x_flag_asynchronous_unwind_tables = 1;
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81 }
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82
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83 /* Implement TARGET_HANDLE_OPTION. */
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84
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85 bool
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86 s390_handle_option (struct gcc_options *opts ATTRIBUTE_UNUSED,
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87 struct gcc_options *opts_set ATTRIBUTE_UNUSED,
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88 const struct cl_decoded_option *decoded,
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89 location_t loc)
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90 {
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91 size_t code = decoded->opt_index;
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92 int value = decoded->value;
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93
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94 switch (code)
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95 {
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96 case OPT_mstack_guard_:
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97 if (value != 0 && exact_log2 (value) == -1)
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98 error_at (loc, "stack guard value must be an exact power of 2");
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99 return true;
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100
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101 case OPT_mstack_size_:
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102 if (value != 0 && exact_log2 (value) == -1)
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103 error_at (loc, "stack size must be an exact power of 2");
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104 return true;
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105
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106 default:
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107 return true;
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108 }
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109 }
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110
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111 /* -fsplit-stack uses a field in the TCB, available with glibc-2.23.
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112 We don't verify it, since earlier versions just have padding at
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113 its place, which works just as well. */
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114
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115 static bool
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116 s390_supports_split_stack (bool report ATTRIBUTE_UNUSED,
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117 struct gcc_options *opts ATTRIBUTE_UNUSED)
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118 {
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119 return true;
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120 }
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121
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122 #undef TARGET_DEFAULT_TARGET_FLAGS
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123 #define TARGET_DEFAULT_TARGET_FLAGS (TARGET_DEFAULT)
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124
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125 #undef TARGET_HANDLE_OPTION
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126 #define TARGET_HANDLE_OPTION s390_handle_option
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127
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128 #undef TARGET_OPTION_OPTIMIZATION_TABLE
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129 #define TARGET_OPTION_OPTIMIZATION_TABLE s390_option_optimization_table
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130
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131 #undef TARGET_OPTION_INIT_STRUCT
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132 #define TARGET_OPTION_INIT_STRUCT s390_option_init_struct
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133
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134 #undef TARGET_SUPPORTS_SPLIT_STACK
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135 #define TARGET_SUPPORTS_SPLIT_STACK s390_supports_split_stack
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136
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137 struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
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