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