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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) 1999-2020 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 /* z900 */ PF_IEEE_FLOAT | PF_ZARCH,
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33 /* z990 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT,
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34 /* z9-109 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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35 | PF_EXTIMM,
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36 /* z9-ec */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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37 | PF_EXTIMM | PF_DFP,
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38 /* z10 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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39 | PF_EXTIMM | PF_DFP | PF_Z10,
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40 /* z196 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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41 | PF_EXTIMM | PF_DFP | PF_Z10 | PF_Z196,
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42 /* zEC12 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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43 | PF_EXTIMM | PF_DFP | PF_Z10 | PF_Z196 | PF_ZEC12 | PF_TX,
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44 /* z13 */ 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 | PF_Z13 | PF_VX,
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47 /* z14 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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48 | PF_EXTIMM | PF_DFP | PF_Z10 | PF_Z196 | PF_ZEC12 | PF_TX
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49 | PF_Z13 | PF_VX | PF_VXE | PF_Z14,
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50 /* z15 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
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51 | PF_EXTIMM | PF_DFP | PF_Z10 | PF_Z196 | PF_ZEC12 | PF_TX
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52 | PF_Z13 | PF_VX | PF_VXE | PF_Z14 | PF_VXE2 | PF_Z15
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53 };
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54
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55 /* Change optimizations to be performed, depending on the
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56 optimization level. */
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57
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58 static const struct default_options s390_option_optimization_table[] =
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59 {
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60 /* Enable -fsched-pressure by default when optimizing. */
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61 { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
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62
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63 /* ??? There are apparently still problems with -fcaller-saves. */
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64 { OPT_LEVELS_ALL, OPT_fcaller_saves, NULL, 0 },
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65
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66 /* Use MVCLE instructions to decrease code size if requested. */
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67 { OPT_LEVELS_SIZE, OPT_mmvcle, NULL, 1 },
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68
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69 { OPT_LEVELS_NONE, 0, NULL, 0 }
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70 };
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71
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72 /* Implement TARGET_OPTION_INIT_STRUCT. */
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73
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74 static void
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75 s390_option_init_struct (struct gcc_options *opts)
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76 {
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77 /* By default, always emit DWARF-2 unwind info. This allows debugging
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78 without maintaining a stack frame back-chain. */
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79 opts->x_flag_asynchronous_unwind_tables = 1;
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80
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81 /* Enable section anchors by default. */
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82 opts->x_flag_section_anchors = 1;
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83 }
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84
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85 /* Implement TARGET_HANDLE_OPTION. */
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86
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87 bool
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88 s390_handle_option (struct gcc_options *opts ATTRIBUTE_UNUSED,
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89 struct gcc_options *opts_set ATTRIBUTE_UNUSED,
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90 const struct cl_decoded_option *decoded,
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91 location_t loc)
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92 {
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93 size_t code = decoded->opt_index;
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94 int value = decoded->value;
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95
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96 switch (code)
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97 {
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98 case OPT_mstack_guard_:
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99 if (value != 0 && exact_log2 (value) == -1)
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100 error_at (loc, "stack guard value must be an exact power of 2");
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101 return true;
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102
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103 case OPT_mstack_size_:
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104 if (value != 0 && exact_log2 (value) == -1)
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105 error_at (loc, "stack size must be an exact power of 2");
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106 return true;
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107
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108 default:
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109 return true;
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110 }
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111 }
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112
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113 /* -fsplit-stack uses a field in the TCB, available with glibc-2.23.
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114 We don't verify it, since earlier versions just have padding at
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115 its place, which works just as well. */
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116
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117 static bool
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118 s390_supports_split_stack (bool report ATTRIBUTE_UNUSED,
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119 struct gcc_options *opts ATTRIBUTE_UNUSED)
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120 {
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121 return true;
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122 }
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123
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124 #undef TARGET_DEFAULT_TARGET_FLAGS
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125 #define TARGET_DEFAULT_TARGET_FLAGS (TARGET_DEFAULT)
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126
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127 #undef TARGET_HANDLE_OPTION
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128 #define TARGET_HANDLE_OPTION s390_handle_option
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129
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130 #undef TARGET_OPTION_OPTIMIZATION_TABLE
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131 #define TARGET_OPTION_OPTIMIZATION_TABLE s390_option_optimization_table
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132
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133 #undef TARGET_OPTION_INIT_STRUCT
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134 #define TARGET_OPTION_INIT_STRUCT s390_option_init_struct
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135
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136 #undef TARGET_SUPPORTS_SPLIT_STACK
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137 #define TARGET_SUPPORTS_SPLIT_STACK s390_supports_split_stack
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138
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139 struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
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