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Starting with version 2.24.51.20140728 MIPS binutils complain loudly
about mixing soft-float and hard-float object files, leading to this
build failure since GCC is invoked with "-msoft-float" on MIPS:
{standard input}: Warning: .gnu_attribute 4,3 requires `softfloat'
LD arch/mips/alchemy/common/built-in.o
mipsel-softfloat-linux-gnu-ld: Warning: arch/mips/alchemy/common/built-in.o
uses -msoft-float (set by arch/mips/alchemy/common/prom.o),
arch/mips/alchemy/common/sleeper.o uses -mhard-float
To fix this, we detect if GAS is new enough to support "-msoft-float" command
option, and if it does, we can let GCC pass it to GAS; but then we also need
to sprinkle the files which make use of floating point registers with the
necessary ".set hardfloat" directives.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Cc: Linux-MIPS <linux-mips@linux-mips.org>
Cc: Matthew Fortune <Matthew.Fortune@imgtec.com>
Cc: Markos Chandras <Markos.Chandras@imgtec.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8355/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/*
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* Definitions for the FPU register names
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995, 1999 Ralf Baechle
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* Copyright (C) 1985 MIPS Computer Systems, Inc.
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* Copyright (C) 1990 - 1992, 1999 Silicon Graphics, Inc.
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*/
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#ifndef _ASM_FPREGDEF_H
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#define _ASM_FPREGDEF_H
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#include <asm/sgidefs.h>
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/*
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* starting with binutils 2.24.51.20140729, MIPS binutils warn about mixing
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* hardfloat and softfloat object files. The kernel build uses soft-float by
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* default, so we also need to pass -msoft-float along to GAS if it supports it.
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* But this in turn causes assembler errors in files which access hardfloat
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* registers. We detect if GAS supports "-msoft-float" in the Makefile and
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* explicitly put ".set hardfloat" where floating point registers are touched.
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*/
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#ifdef GAS_HAS_SET_HARDFLOAT
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#define SET_HARDFLOAT .set hardfloat
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#else
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#define SET_HARDFLOAT
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#endif
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#if _MIPS_SIM == _MIPS_SIM_ABI32
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/*
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* These definitions only cover the R3000-ish 16/32 register model.
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* But we're trying to be R3000 friendly anyway ...
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*/
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#define fv0 $f0 /* return value */
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#define fv0f $f1
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#define fv1 $f2
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#define fv1f $f3
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#define fa0 $f12 /* argument registers */
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#define fa0f $f13
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#define fa1 $f14
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#define fa1f $f15
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#define ft0 $f4 /* caller saved */
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#define ft0f $f5
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#define ft1 $f6
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#define ft1f $f7
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#define ft2 $f8
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#define ft2f $f9
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#define ft3 $f10
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#define ft3f $f11
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#define ft4 $f16
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#define ft4f $f17
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#define ft5 $f18
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#define ft5f $f19
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#define fs0 $f20 /* callee saved */
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#define fs0f $f21
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#define fs1 $f22
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#define fs1f $f23
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#define fs2 $f24
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#define fs2f $f25
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#define fs3 $f26
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#define fs3f $f27
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#define fs4 $f28
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#define fs4f $f29
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#define fs5 $f30
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#define fs5f $f31
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#define fcr31 $31 /* FPU status register */
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#endif /* _MIPS_SIM == _MIPS_SIM_ABI32 */
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#if _MIPS_SIM == _MIPS_SIM_ABI64 || _MIPS_SIM == _MIPS_SIM_NABI32
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#define fv0 $f0 /* return value */
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#define fv1 $f2
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#define fa0 $f12 /* argument registers */
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#define fa1 $f13
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#define fa2 $f14
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#define fa3 $f15
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#define fa4 $f16
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#define fa5 $f17
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#define fa6 $f18
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#define fa7 $f19
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#define ft0 $f4 /* caller saved */
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#define ft1 $f5
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#define ft2 $f6
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#define ft3 $f7
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#define ft4 $f8
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#define ft5 $f9
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#define ft6 $f10
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#define ft7 $f11
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#define ft8 $f20
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#define ft9 $f21
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#define ft10 $f22
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#define ft11 $f23
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#define ft12 $f1
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#define ft13 $f3
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#define fs0 $f24 /* callee saved */
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#define fs1 $f25
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#define fs2 $f26
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#define fs3 $f27
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#define fs4 $f28
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#define fs5 $f29
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#define fs6 $f30
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#define fs7 $f31
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#define fcr31 $31
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#endif /* _MIPS_SIM == _MIPS_SIM_ABI64 || _MIPS_SIM == _MIPS_SIM_NABI32 */
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#endif /* _ASM_FPREGDEF_H */
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