#
# Submitted:
#
# Dimitry Andric <dimitry@andric.com>, 2004-05-01
#
# Description:
#
# Nicholas Pitre released this patch for gcc soft-float support here:
# http://lists.arm.linux.org.uk/pipermail/linux-arm/2003-October/006436.html
#
# This version has been adapted to work with gcc 3.4.0.
#
# The original patch doesn't distinguish between softfpa and softvfp modes
# in the way Nicholas Pitre probably meant. His description is:
#
# "Default is to use APCS-32 mode with soft-vfp. The old Linux default for
# floats can be achieved with -mhard-float or with the configure
# --with-float=hard option. If -msoft-float or --with-float=soft is used then
# software float support will be used just like the default but with the legacy
# big endian word ordering for double float representation instead."
#
# Which means the following:
#
# * If you compile without -mhard-float or -msoft-float, you should get
# software floating point, using the VFP format. The produced object file
# should have these flags in its header:
#
# private flags = 600: [APCS-32] [VFP float format] [software FP]
#
# * If you compile with -mhard-float, you should get hardware floating point,
# which always uses the FPA format. Object file header flags should be:
#
# private flags = 0: [APCS-32] [FPA float format]
#
# * If you compile with -msoft-float, you should get software floating point,
# using the FPA format. This is done for compatibility reasons with many
# existing distributions. Object file header flags should be:
#
# private flags = 200: [APCS-32] [FPA float format] [software FP]
#
# The original patch from Nicholas Pitre contained the following constructs:
#
# #define SUBTARGET_EXTRA_ASM_SPEC "%{!mcpu=*:-mcpu=xscale} \
# %{mhard-float:-mfpu=fpa} \
# %{!mhard-float: %{msoft-float:-mfpu=softfpa;:-mfpu=softvfp}}"
#
# However, gcc doesn't accept this ";:" notation, used in the 3rd line. This
# is probably the reason Robert Schwebel modified it to:
#
# #define SUBTARGET_EXTRA_ASM_SPEC "%{!mcpu=*:-mcpu=xscale} \
# %{mhard-float:-mfpu=fpa} \
# %{!mhard-float: %{msoft-float:-mfpu=softfpa -mfpu=softvfp}}"
#
# But this causes the following behaviour:
#
# * If you compile without -mhard-float or -msoft-float, the compiler generates
# software floating point instructions, but *nothing* is passed to the
# assembler, which results in an object file which has flags:
#
# private flags = 0: [APCS-32] [FPA float format]
#
# This is not correct!
#
# * If you compile with -mhard-float, the compiler generates hardware floating
# point instructions, and passes "-mfpu=fpa" to the assembler, which results
# in an object file which has the same flags as in the previous item, but now
# those *are* correct.
#
# * If you compile with -msoft-float, the compiler generates software floating
# point instructions, and passes "-mfpu=softfpa -mfpu=softvfp" (in that
# order) to the assembler, which results in an object file with flags:
#
# private flags = 600: [APCS-32] [VFP float format] [software FP]
#
# This is not correct, because the last "-mfpu=" option on the assembler
# command line determines the actual FPU convention used (which should be FPA
# in this case).
#
# Therefore, I modified this patch to get the desired behaviour. Every
# instance of the notation:
#
# %{msoft-float:-mfpu=softfpa -mfpu=softvfp}
#
# was changed to:
#
# %{msoft-float:-mfpu=softfpa} %{!msoft-float:-mfpu=softvfp}
#
# I also did the following:
#
# * Modified all TARGET_DEFAULT macros I could find to include ARM_FLAG_VFP, to
# be consistent with Nicholas' original patch.
# * Removed any "msoft-float" or "mhard-float" from all MULTILIB_DEFAULTS
# macros I could find. I think that if you compile without any options, you
# would like to get the defaults. :)
# * Removed the extra -lfloat option from LIBGCC_SPEC, since it isn't needed
# anymore. (The required functions are now in libgcc.)
diff -urNd gcc-3.4.0-orig/gcc/config/arm/coff.h gcc-3.4.0/gcc/config/arm/coff.h
--- gcc-3.4.0-orig/gcc/config/arm/coff.h 2004-02-24 15:25:22.000000000 +0100
+++ gcc-3.4.0/gcc/config/arm/coff.h 2004-05-01 19:07:06.059409600 +0200
@@ -31,11 +31,16 @@
#define TARGET_VERSION fputs (" (ARM/coff)", stderr)
#undef TARGET_DEFAULT
-#define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME | ARM_FLAG_MMU_TRAPS)
+#define TARGET_DEFAULT \
+ ( ARM_FLAG_SOFT_FLOAT \
+ | ARM_FLAG_VFP \
+ | ARM_FLAG_APCS_32 \
+ | ARM_FLAG_APCS_FRAME \
+ | ARM_FLAG_MMU_TRAPS )
#ifndef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS \
- { "marm", "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork" }
+ { "marm", "mlittle-endian", "mapcs-32", "mno-thumb-interwork" }
#endif
/* This is COFF, but prefer stabs. */
diff -urNd gcc-3.4.0-orig/gcc/config/arm/elf.h gcc-3.4.0/gcc/config/arm/elf.h
--- gcc-3.4.0-orig/gcc/config/arm/elf.h 2004-02-24 15:25:22.000000000 +0100
+++ gcc-3.4.0/gcc/config/arm/elf.h 2004-05-01 19:12:16.976486400 +0200
@@ -46,7 +46,9 @@
#ifndef SUBTARGET_ASM_FLOAT_SPEC
#define SUBTARGET_ASM_FLOAT_SPEC "\
-%{mapcs-float:-mfloat} %{msoft-float:-mfpu=softfpa}"
+%{mapcs-float:-mfloat} \
+%{mhard-float:-mfpu=fpa} \
+%{!mhard-float: %{msoft-float:-mfpu=softfpa} %{!msoft-float:-mfpu=softvfp}}"
#endif
#ifndef ASM_SPEC
@@ -106,12 +108,17 @@
#endif
#ifndef TARGET_DEFAULT
-#define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME | ARM_FLAG_MMU_TRAPS)
+#define TARGET_DEFAULT \
+ ( ARM_FLAG_SOFT_FLOAT \
+ | ARM_FLAG_VFP \
+ | ARM_FLAG_APCS_32 \
+ | ARM_FLAG_APCS_FRAME \
+ | ARM_FLAG_MMU_TRAPS )
#endif
#ifndef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS \
- { "marm", "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork", "fno-leading-underscore" }
+ { "marm", "mlittle-endian", "mapcs-32", "mno-thumb-interwork", "fno-leading-underscore" }
#endif
#define TARGET_ASM_FILE_START_APP_OFF true
diff -urNd gcc-3.4.0-orig/gcc/config/arm/linux-elf.h gcc-3.4.0/gcc/config/arm/linux-elf.h
--- gcc-3.4.0-orig/gcc/config/arm/linux-elf.h 2004-01-31 07:18:11.000000000 +0100
+++ gcc-3.4.0/gcc/config/arm/linux-elf.h 2004-05-01 19:19:06.935979200 +0200
@@ -30,9 +30,27 @@
/* Do not assume anything about header files. */
#define NO_IMPLICIT_EXTERN_C
-/* Default is to use APCS-32 mode. */
+/*
+ * Default is to use APCS-32 mode with soft-vfp.
+ * The old Linux default for floats can be achieved with -mhard-float
+ * or with the configure --with-float=hard option.
+ * If -msoft-float or --with-float=soft is used then software float
+ * support will be used just like the default but with the legacy
+ * big endian word ordering for double float representation instead.
+ */
+
#undef TARGET_DEFAULT
-#define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_MMU_TRAPS)
+#define TARGET_DEFAULT \
+ ( ARM_FLAG_APCS_32 \
+ | ARM_FLAG_SOFT_FLOAT \
+ | ARM_FLAG_VFP \
+ | ARM_FLAG_MMU_TRAPS )
+
+#undef SUBTARGET_EXTRA_ASM_SPEC
+#define SUBTARGET_EXTRA_ASM_SPEC "\
+%{!mcpu=*:-mcpu=xscale} \
+%{mhard-float:-mfpu=fpa} \
+%{!mhard-float: %{msoft-float:-mfpu=softfpa} %{!msoft-float:-mfpu=softvfp}}"
#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
@@ -40,7 +58,7 @@
#undef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS \
- { "marm", "mlittle-endian", "mhard-float", "mapcs-32", "mno-thumb-interwork" }
+ { "marm", "mlittle-endian", "mapcs-32", "mno-thumb-interwork" }
#define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
@@ -55,7 +73,7 @@
%{shared:-lc} \
%{!shared:%{profile:-lc_p}%{!profile:-lc}}"
-#define LIBGCC_SPEC "%{msoft-float:-lfloat} -lgcc"
+#define LIBGCC_SPEC "-lgcc"
/* Provide a STARTFILE_SPEC appropriate for GNU/Linux. Here we add
the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
diff -urNd gcc-3.4.0-orig/gcc/config/arm/t-linux gcc-3.4.0/gcc/config/arm/t-linux
--- gcc-3.4.0-orig/gcc/config/arm/t-linux 2003-09-20 23:09:07.000000000 +0200
+++ gcc-3.4.0/gcc/config/arm/t-linux 2004-05-01 20:31:59.102846400 +0200
@@ -4,7 +4,10 @@
LIBGCC2_DEBUG_CFLAGS = -g0
LIB1ASMSRC = arm/lib1funcs.asm
-LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_lnx
+LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_lnx \
+ _negdf2 _addsubdf3 _muldivdf3 _cmpdf2 _unorddf2 _fixdfsi _fixunsdfsi \
+ _truncdfsf2 _negsf2 _addsubsf3 _muldivsf3 _cmpsf2 _unordsf2 \
+ _fixsfsi _fixunssfsi
# MULTILIB_OPTIONS = mhard-float/msoft-float
# MULTILIB_DIRNAMES = hard-float soft-float
diff -urNd gcc-3.4.0-orig/gcc/config/arm/unknown-elf.h gcc-3.4.0/gcc/config/arm/unknown-elf.h
--- gcc-3.4.0-orig/gcc/config/arm/unknown-elf.h 2004-02-24 15:25:22.000000000 +0100
+++ gcc-3.4.0/gcc/config/arm/unknown-elf.h 2004-05-01 19:09:09.016212800 +0200
@@ -30,7 +30,12 @@
/* Default to using APCS-32 and software floating point. */
#ifndef TARGET_DEFAULT
-#define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME | ARM_FLAG_MMU_TRAPS)
+#define TARGET_DEFAULT \
+ ( ARM_FLAG_SOFT_FLOAT \
+ | ARM_FLAG_VFP \
+ | ARM_FLAG_APCS_32 \
+ | ARM_FLAG_APCS_FRAME \
+ | ARM_FLAG_MMU_TRAPS )
#endif
/* Now we define the strings used to build the spec file. */
diff -urNd gcc-3.4.0-orig/gcc/config/arm/xscale-elf.h gcc-3.4.0/gcc/config/arm/xscale-elf.h
--- gcc-3.4.0-orig/gcc/config/arm/xscale-elf.h 2003-07-02 01:26:43.000000000 +0200
+++ gcc-3.4.0/gcc/config/arm/xscale-elf.h 2004-05-01 20:15:36.620105600 +0200
@@ -49,11 +49,12 @@
endian, regardless of the endian-ness of the memory
system. */
-#define SUBTARGET_EXTRA_ASM_SPEC "%{!mcpu=*:-mcpu=xscale} \
- %{mhard-float:-mfpu=fpa} \
- %{!mhard-float: %{msoft-float:-mfpu=softfpa;:-mfpu=softvfp}}"
+#define SUBTARGET_EXTRA_ASM_SPEC "\
+%{!mcpu=*:-mcpu=xscale} \
+%{mhard-float:-mfpu=fpa} \
+%{!mhard-float: %{msoft-float:-mfpu=softfpa} %{!msoft-float:-mfpu=softvfp}}"
#ifndef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS \
- { "mlittle-endian", "mno-thumb-interwork", "marm", "msoft-float" }
+ { "mlittle-endian", "mno-thumb-interwork", "marm" }
#endif
