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1 # Copyright (C) 2006-2020 Free Software Foundation, Inc.
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111
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2
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3 # This file is part of GCC.
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4
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5 # GCC is free software; you can redistribute it and/or modify
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6 # it under the terms of the GNU General Public License as published by
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7 # the Free Software Foundation; either version 3, or (at your option)
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8 # any later version.
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9
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10 # GCC is distributed in the hope that it will be useful,
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11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 # GNU General Public License for more details.
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14
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15 # You should have received a copy of the GNU General Public License
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16 # along with GCC; see the file COPYING3. If not see
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17 # <http://www.gnu.org/licenses/>.
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18
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19 # Targets using soft-fp should define the following variables:
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20 #
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21 # softfp_float_modes: a list of soft-float floating-point modes,
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22 # e.g. sf df
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23 # softfp_int_modes: a list of integer modes for which to define conversions,
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24 # e.g. si di
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25 # softfp_extensions: a list of extensions between floating-point modes,
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26 # e.g. sfdf
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27 # softfp_truncations: a list of truncations between floating-point modes,
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28 # e.g. dfsf
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29 #
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30 # Extensions and truncations should include those where only one mode
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31 # is a soft-float mode; for example, sftf where sf is hard-float and
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32 # tf is soft-float.
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33 #
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34 # If some additional functions should be built that are not implied by
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35 # the above settings, also define softfp_extras as a list of those
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36 # functions, e.g. unorddf2.
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37 #
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38 # If the functions should only be built as compat symbols for shared
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39 # libgcc, not available for new links, also define:
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40 #
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41 # softfp_compat := y
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42 #
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43 # If the libgcc2.c functions should not be replaced, also define:
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44 #
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45 # softfp_exclude_libgcc2 := y
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46 #
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47 # Avoiding replacing the libgcc2.c functions is a temporary measure
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48 # for targets with both hard-float and soft-float multilibs, since
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49 # these variables apply for all multilibs. With toplevel libgcc,
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50 # soft-fp can be used conditionally on the multilib instead.
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51 #
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52 # If the code should not be compiled at all for some multilibs, define:
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53 #
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54 # softfp_wrap_start: text to put at the start of wrapper source files,
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55 # output with echo
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56 # e.g. '#ifndef __powerpc64__'
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57 # softfp_wrap_end: text to put at the end of wrapper source files,
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58 # e.g. '#endif'
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59 #
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60 # This is another temporary measure, and cannot be used together with
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61 # softfp_compat.
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62
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63 softfp_float_funcs = add$(m)3 div$(m)3 eq$(m)2 ge$(m)2 le$(m)2 mul$(m)3 \
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64 neg$(m)2 sub$(m)3 unord$(m)2
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65 softfp_floatint_funcs = fix$(m)$(i) fixuns$(m)$(i) \
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66 float$(i)$(m) floatun$(i)$(m)
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67
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68 softfp_func_list := \
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69 $(foreach m,$(softfp_float_modes), \
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70 $(softfp_float_funcs) \
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71 $(foreach i,$(softfp_int_modes), \
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72 $(softfp_floatint_funcs))) \
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73 $(foreach e,$(softfp_extensions),extend$(e)2) \
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74 $(foreach t,$(softfp_truncations),trunc$(t)2) \
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75 $(softfp_extras)
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76
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77 ifeq ($(softfp_exclude_libgcc2),y)
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78 # This list is taken from mklibgcc.in and doesn't presently allow for
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79 # 64-bit targets where si should become di and di should become ti.
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80 softfp_func_list := $(filter-out floatdidf floatdisf fixunsdfsi fixunssfsi \
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81 fixunsdfdi fixdfdi fixunssfdi fixsfdi fixxfdi fixunsxfdi \
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82 floatdixf fixunsxfsi fixtfdi fixunstfdi floatditf \
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83 floatundidf floatundisf floatundixf floatunditf,$(softfp_func_list))
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84 endif
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85
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86 ifeq ($(softfp_compat),y)
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87 softfp_file_list := $(addsuffix .c,$(softfp_func_list))
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88
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89 ifeq ($(enable_shared),yes)
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90 softfp_map_dep := libgcc.map.in
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91 else
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92 softfp_map_dep :=
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93 endif
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94 softfp_set_symver = echo "asm (\".symver $(1),$(1)@`$(AWK) -f $(srcdir)/find-symver.awk -v symbol=$(1) libgcc.map.in`\");" >> $@
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95 $(softfp_file_list): $(softfp_map_dep)
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96 echo '#ifdef SHARED' > $@
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97 echo '#include "soft-fp/$@"' >> $@
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98 ifeq ($(enable_shared),yes)
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99 $(call softfp_set_symver,__$(*F))
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100 if grep strong_alias $(srcdir)/soft-fp/$@ > /dev/null; then \
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101 alias=`grep strong_alias $(srcdir)/soft-fp/$@ | sed -e 's/.*, *//' -e 's/).*//'`; \
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102 $(call softfp_set_symver,$$alias); \
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103 fi
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104 endif
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105 echo '#endif' >> $@
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106 else
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107 ifneq ($(softfp_wrap_start),)
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108 softfp_file_list := $(addsuffix .c,$(softfp_func_list))
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109
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110 $(softfp_file_list):
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111 echo $(softfp_wrap_start) > $@
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112 echo '#include "soft-fp/$@"' >> $@
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113 echo $(softfp_wrap_end) >> $@
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114 else
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115 softfp_file_list := \
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116 $(addsuffix .c,$(addprefix $(srcdir)/soft-fp/,$(softfp_func_list)))
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117 endif
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118 endif
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119
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120 # Disable missing prototype and type limit warnings. The prototypes
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121 # for the functions in the soft-fp files have not been brought across
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122 # from glibc.
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123
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111
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124 soft-fp-objects-base = $(basename $(notdir $(softfp_file_list)))
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0
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125
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126 soft-fp-objects = $(addsuffix $(objext), $(soft-fp-objects-base)) \
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127 $(addsuffix _s$(objext), $(soft-fp-objects-base))
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128
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129 $(soft-fp-objects) : INTERNAL_CFLAGS += -Wno-missing-prototypes -Wno-type-limits
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111
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130
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131 LIB2ADD += $(softfp_file_list)
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132
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133 ifneq ($(softfp_exclude_libgcc2),y)
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134 # Functions in libgcc2.c are excluded for each soft-float mode (a
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135 # target may have both soft-float and hard-float modes), for the fixed
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136 # list of integer modes (si and di) for which libgcc2.c defines any
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137 # such functions. Depending on the target, the si and di symbols may
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138 # in fact define di and ti functions.
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139
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140 LIB2FUNCS_EXCLUDE += \
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141 $(addprefix _,$(foreach m,$(softfp_float_modes), \
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142 $(foreach i,si di, \
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143 $(softfp_floatint_funcs))))
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144 endif
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