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glibc/sysdeps/arm/fpu_control.h

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Add ARM EABI port.
2005-10-10 15:29:32 +00:00
/* FPU control word definitions. ARM VFP version.
Update copyright dates with scripts/update-copyrights.
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Copyright (C) 2004-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
Fix GPL and GCC references in last paragraphs of license notices.
2011-03-21 15:40:37 +00:00
You should have received a copy of the GNU Lesser General Public
Replace FSF snail mail address by URL.
2012-03-09 23:56:38 +00:00
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
Add ARM EABI port.
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#ifndef _FPU_CONTROL_H
#define _FPU_CONTROL_H
Wrap test-fpucw.c for ARM.
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#if !(defined(_LIBC) && !defined(_LIBC_TEST)) && defined(__SOFTFP__)
2009-04-25 Aurelien Jarno <aurelien@aurel32.net> * sysdeps/arm/eabi/fpu_control.h: If soft-float, don't use floating-point registers.
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#define _FPU_RESERVED 0xffffffff
#define _FPU_DEFAULT 0x00000000
typedef unsigned int fpu_control_t;
Fix warnings from ARM soft-float fpu_control.h.
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#define _FPU_GETCW(cw) (cw) = 0
#define _FPU_SETCW(cw) (void) (cw)
2009-04-25 Aurelien Jarno <aurelien@aurel32.net> * sysdeps/arm/eabi/fpu_control.h: If soft-float, don't use floating-point registers.
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extern fpu_control_t __fpu_control;
#else
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/* masking of interrupts */
#define _FPU_MASK_IM 0x00000100 /* invalid operation */
#define _FPU_MASK_ZM 0x00000200 /* divide by zero */
#define _FPU_MASK_OM 0x00000400 /* overflow */
#define _FPU_MASK_UM 0x00000800 /* underflow */
#define _FPU_MASK_PM 0x00001000 /* inexact */
Add _FPU_MASK_RM and use it instead of FE_TOWARDZERO. 2014-06-24 Wilco <wdijkstr@arm.com> * sysdeps/arm/fpu_control.h (_FPU_MASK_RM): Define. * sysdeps/arm/fenv_private.h (libc_fesetround_vfp) (libc_feholdexcept_setround_vfp) (libc_feholdsetround_vfp) (libc_feresetround_vfp) (libc_feholdsetround_vfp_ctx) (libc_feresetround_vfp_ctx): Use _FPU_MASK_RM. * sysdeps/arm/fesetround.c (fesetround): Use _FPU_MASK_RM. * sysdeps/arm/get-rounding-mode.h (get_rounding_mode): Use _FPU_MASK_RM.
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#define _FPU_MASK_NZCV 0xf0000000 /* NZCV flags */
#define _FPU_MASK_RM 0x00c00000 /* rounding mode */
[ARM] Add support for fenv_private on ARM.
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#define _FPU_MASK_EXCEPT 0x00001f1f /* all exception flags */
Add ARM EABI port.
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/* Some bits in the FPSCR are not yet defined. They must be preserved when
modifying the contents. */
Update ARM _FPU_RESERVED value.
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#define _FPU_RESERVED 0x00086060
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#define _FPU_DEFAULT 0x00000000
[ARM] Add support for fenv_private on ARM.
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/* Default + exceptions enabled. */
Add ARM EABI port.
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#define _FPU_IEEE (_FPU_DEFAULT | 0x00001f00)
/* Type of the control word. */
typedef unsigned int fpu_control_t;
/* Macros for accessing the hardware control word. */
Fix ARM fpu_control.h for assemblers requiring VFP insn names (bug 21047). Bug 21047 reports that the clang assembler disallows the ARM implementations of _FPU_GETCW and _FPU_SETCW. These are deliberately written the way they are, using generic coprocessor instructions (from the days when VFP was just one possible coprocessor for ARM) that have the right encodings, to handle the case of the instructions being used runtime-conditionally inside glibc, where use of these macros is not meant to result in either the assembler requiring VFP to be enabled at assembly time or in it marking the object as using VFP. However, more recent ARM ARM versions have restricted the definitions of the coprocessor instructions and reportedly the clang assembler follows that in disallowing those names for VFP instructions. In the non-__SOFTFP__ case - which in fact is the only case where these macro definitions can be used outside the build of glibc itself - using VFP instruction names is of course fine, since we know that VFP is enabled for that compilation. Thus, this patch uses the current VFP names for these instructions in that case to improve compatibility for this header file. Tested for hard-float and soft-float builds of glibc, including that installed stripped shared libraries are unchanged by the patch. [BZ #21047] * sysdeps/arm/fpu_control.h [!__SOFTFP__] (_FPU_GETCW): Use VFP name for instruction. [!__SOFTFP__] (_FPU_SETCW): Likewise.
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#ifdef __SOFTFP__
Add ARM EABI port.
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/* This is fmrx %0, fpscr. */
Fix ARM fpu_control.h for assemblers requiring VFP insn names (bug 21047). Bug 21047 reports that the clang assembler disallows the ARM implementations of _FPU_GETCW and _FPU_SETCW. These are deliberately written the way they are, using generic coprocessor instructions (from the days when VFP was just one possible coprocessor for ARM) that have the right encodings, to handle the case of the instructions being used runtime-conditionally inside glibc, where use of these macros is not meant to result in either the assembler requiring VFP to be enabled at assembly time or in it marking the object as using VFP. However, more recent ARM ARM versions have restricted the definitions of the coprocessor instructions and reportedly the clang assembler follows that in disallowing those names for VFP instructions. In the non-__SOFTFP__ case - which in fact is the only case where these macro definitions can be used outside the build of glibc itself - using VFP instruction names is of course fine, since we know that VFP is enabled for that compilation. Thus, this patch uses the current VFP names for these instructions in that case to improve compatibility for this header file. Tested for hard-float and soft-float builds of glibc, including that installed stripped shared libraries are unchanged by the patch. [BZ #21047] * sysdeps/arm/fpu_control.h [!__SOFTFP__] (_FPU_GETCW): Use VFP name for instruction. [!__SOFTFP__] (_FPU_SETCW): Likewise.
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# define _FPU_GETCW(cw) \
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__asm__ __volatile__ ("mrc p10, 7, %0, cr1, cr0, 0" : "=r" (cw))
/* This is fmxr fpscr, %0. */
Fix ARM fpu_control.h for assemblers requiring VFP insn names (bug 21047). Bug 21047 reports that the clang assembler disallows the ARM implementations of _FPU_GETCW and _FPU_SETCW. These are deliberately written the way they are, using generic coprocessor instructions (from the days when VFP was just one possible coprocessor for ARM) that have the right encodings, to handle the case of the instructions being used runtime-conditionally inside glibc, where use of these macros is not meant to result in either the assembler requiring VFP to be enabled at assembly time or in it marking the object as using VFP. However, more recent ARM ARM versions have restricted the definitions of the coprocessor instructions and reportedly the clang assembler follows that in disallowing those names for VFP instructions. In the non-__SOFTFP__ case - which in fact is the only case where these macro definitions can be used outside the build of glibc itself - using VFP instruction names is of course fine, since we know that VFP is enabled for that compilation. Thus, this patch uses the current VFP names for these instructions in that case to improve compatibility for this header file. Tested for hard-float and soft-float builds of glibc, including that installed stripped shared libraries are unchanged by the patch. [BZ #21047] * sysdeps/arm/fpu_control.h [!__SOFTFP__] (_FPU_GETCW): Use VFP name for instruction. [!__SOFTFP__] (_FPU_SETCW): Likewise.
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# define _FPU_SETCW(cw) \
Add ARM EABI port.
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__asm__ __volatile__ ("mcr p10, 7, %0, cr1, cr0, 0" : : "r" (cw))
Fix ARM fpu_control.h for assemblers requiring VFP insn names (bug 21047). Bug 21047 reports that the clang assembler disallows the ARM implementations of _FPU_GETCW and _FPU_SETCW. These are deliberately written the way they are, using generic coprocessor instructions (from the days when VFP was just one possible coprocessor for ARM) that have the right encodings, to handle the case of the instructions being used runtime-conditionally inside glibc, where use of these macros is not meant to result in either the assembler requiring VFP to be enabled at assembly time or in it marking the object as using VFP. However, more recent ARM ARM versions have restricted the definitions of the coprocessor instructions and reportedly the clang assembler follows that in disallowing those names for VFP instructions. In the non-__SOFTFP__ case - which in fact is the only case where these macro definitions can be used outside the build of glibc itself - using VFP instruction names is of course fine, since we know that VFP is enabled for that compilation. Thus, this patch uses the current VFP names for these instructions in that case to improve compatibility for this header file. Tested for hard-float and soft-float builds of glibc, including that installed stripped shared libraries are unchanged by the patch. [BZ #21047] * sysdeps/arm/fpu_control.h [!__SOFTFP__] (_FPU_GETCW): Use VFP name for instruction. [!__SOFTFP__] (_FPU_SETCW): Likewise.
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#else
# define _FPU_GETCW(cw) \
__asm__ __volatile__ ("vmrs %0, fpscr" : "=r" (cw))
# define _FPU_SETCW(cw) \
__asm__ __volatile__ ("vmsr fpscr, %0" : : "r" (cw))
#endif
Add ARM EABI port.
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/* Default control word set at startup. */
extern fpu_control_t __fpu_control;
2009-04-25 Aurelien Jarno <aurelien@aurel32.net> * sysdeps/arm/eabi/fpu_control.h: If soft-float, don't use floating-point registers.
2009-04-25 15:23:44 +00:00
#endif /* __SOFTFP__ */
Add ARM EABI port.
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#endif /* _FPU_CONTROL_H */
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