1# Copyright (C) 2006-2019 Free Software Foundation, Inc. 2 3# This file is part of GCC. 4 5# GCC is free software; you can redistribute it and/or modify 6# it under the terms of the GNU General Public License as published by 7# the Free Software Foundation; either version 3, or (at your option) 8# any later version. 9 10# GCC is distributed in the hope that it will be useful, 11# but WITHOUT ANY WARRANTY; without even the implied warranty of 12# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13# GNU General Public License for more details. 14 15# You should have received a copy of the GNU General Public License 16# along with GCC; see the file COPYING3. If not see 17# <http://www.gnu.org/licenses/>. 18 19# Targets using soft-fp should define the following variables: 20# 21# softfp_float_modes: a list of soft-float floating-point modes, 22# e.g. sf df 23# softfp_int_modes: a list of integer modes for which to define conversions, 24# e.g. si di 25# softfp_extensions: a list of extensions between floating-point modes, 26# e.g. sfdf 27# softfp_truncations: a list of truncations between floating-point modes, 28# e.g. dfsf 29# 30# Extensions and truncations should include those where only one mode 31# is a soft-float mode; for example, sftf where sf is hard-float and 32# tf is soft-float. 33# 34# If some additional functions should be built that are not implied by 35# the above settings, also define softfp_extras as a list of those 36# functions, e.g. unorddf2. 37# 38# If the functions should only be built as compat symbols for shared 39# libgcc, not available for new links, also define: 40# 41# softfp_compat := y 42# 43# If the libgcc2.c functions should not be replaced, also define: 44# 45# softfp_exclude_libgcc2 := y 46# 47# Avoiding replacing the libgcc2.c functions is a temporary measure 48# for targets with both hard-float and soft-float multilibs, since 49# these variables apply for all multilibs. With toplevel libgcc, 50# soft-fp can be used conditionally on the multilib instead. 51# 52# If the code should not be compiled at all for some multilibs, define: 53# 54# softfp_wrap_start: text to put at the start of wrapper source files, 55# output with echo 56# e.g. '#ifndef __powerpc64__' 57# softfp_wrap_end: text to put at the end of wrapper source files, 58# e.g. '#endif' 59# 60# This is another temporary measure, and cannot be used together with 61# softfp_compat. 62 63softfp_float_funcs = add$(m)3 div$(m)3 eq$(m)2 ge$(m)2 le$(m)2 mul$(m)3 \ 64 neg$(m)2 sub$(m)3 unord$(m)2 65softfp_floatint_funcs = fix$(m)$(i) fixuns$(m)$(i) \ 66 float$(i)$(m) floatun$(i)$(m) 67 68softfp_func_list := \ 69 $(foreach m,$(softfp_float_modes), \ 70 $(softfp_float_funcs) \ 71 $(foreach i,$(softfp_int_modes), \ 72 $(softfp_floatint_funcs))) \ 73 $(foreach e,$(softfp_extensions),extend$(e)2) \ 74 $(foreach t,$(softfp_truncations),trunc$(t)2) \ 75 $(softfp_extras) 76 77ifeq ($(softfp_exclude_libgcc2),y) 78# This list is taken from mklibgcc.in and doesn't presently allow for 79# 64-bit targets where si should become di and di should become ti. 80softfp_func_list := $(filter-out floatdidf floatdisf fixunsdfsi fixunssfsi \ 81 fixunsdfdi fixdfdi fixunssfdi fixsfdi fixxfdi fixunsxfdi \ 82 floatdixf fixunsxfsi fixtfdi fixunstfdi floatditf \ 83 floatundidf floatundisf floatundixf floatunditf,$(softfp_func_list)) 84endif 85 86ifeq ($(softfp_compat),y) 87softfp_file_list := $(addsuffix .c,$(softfp_func_list)) 88 89ifeq ($(enable_shared),yes) 90softfp_map_dep := libgcc.map.in 91else 92softfp_map_dep := 93endif 94softfp_set_symver = echo "asm (\".symver $(1),$(1)@`$(AWK) -f $(srcdir)/find-symver.awk -v symbol=$(1) libgcc.map.in`\");" >> $@ 95$(softfp_file_list): $(softfp_map_dep) 96 echo '#ifdef SHARED' > $@ 97 echo '#include "soft-fp/$@"' >> $@ 98ifeq ($(enable_shared),yes) 99 $(call softfp_set_symver,__$(*F)) 100 if grep strong_alias $(srcdir)/soft-fp/$@ > /dev/null; then \ 101 alias=`grep strong_alias $(srcdir)/soft-fp/$@ | sed -e 's/.*, *//' -e 's/).*//'`; \ 102 $(call softfp_set_symver,$$alias); \ 103 fi 104endif 105 echo '#endif' >> $@ 106else 107ifneq ($(softfp_wrap_start),) 108softfp_file_list := $(addsuffix .c,$(softfp_func_list)) 109 110$(softfp_file_list): 111 echo $(softfp_wrap_start) > $@ 112 echo '#include "soft-fp/$@"' >> $@ 113 echo $(softfp_wrap_end) >> $@ 114else 115softfp_file_list := \ 116 $(addsuffix .c,$(addprefix $(srcdir)/soft-fp/,$(softfp_func_list))) 117endif 118endif 119 120# Disable missing prototype and type limit warnings. The prototypes 121# for the functions in the soft-fp files have not been brought across 122# from glibc. 123 124soft-fp-objects-base = $(basename $(notdir $(softfp_file_list))) 125 126soft-fp-objects = $(addsuffix $(objext), $(soft-fp-objects-base)) \ 127 $(addsuffix _s$(objext), $(soft-fp-objects-base)) 128 129$(soft-fp-objects) : INTERNAL_CFLAGS += -Wno-missing-prototypes -Wno-type-limits 130 131LIB2ADD += $(softfp_file_list) 132 133ifneq ($(softfp_exclude_libgcc2),y) 134# Functions in libgcc2.c are excluded for each soft-float mode (a 135# target may have both soft-float and hard-float modes), for the fixed 136# list of integer modes (si and di) for which libgcc2.c defines any 137# such functions. Depending on the target, the si and di symbols may 138# in fact define di and ti functions. 139 140LIB2FUNCS_EXCLUDE += \ 141 $(addprefix _,$(foreach m,$(softfp_float_modes), \ 142 $(foreach i,si di, \ 143 $(softfp_floatint_funcs)))) 144endif 145