mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-07 03:36:16 +09:00
a67ef280f4
This way we may have very limited set of functions implemented so we save some space. Also it allows us to build U-Boot for any ARC core with the same one toolchain because we don't rely on pre-built libgcc. For example: * we may use little-endian toolchain but build U-Boot for ether endianess * we may use non-multilibbed uClibc toolchain but build U-Boot for whatever ARC CPU flavour that current GCC supports Private libgcc built from generic C implementation contributes only 144 bytes to .text section so we don't see significant degradation of size: --->8--- $ arc-linux-size u-boot.libgcc-prebuilt text data bss dec hex filename 222217 24912 214820 461949 70c7d u-boot.libgcc-prebuilt $ arc-linux-size u-boot.libgcc-private text data bss dec hex filename 222361 24912 214820 462093 70d0d u-boot.libgcc-private --->8--- Also I don't notice visible performance degradation compared to pre-built libgcc (where at least "*div*" functions are had-written in assembly) on typical operations of downloading 10Mb uImage over TFTP and bootm. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/*
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* Copyright (C) 1989-2013 Free Software Foundation, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __ASM_LIBGCC_H
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#define __ASM_LIBGCC_H
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#define UNITS_PER_WORD 4 /* for ARC */
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#define BITS_PER_UNIT 8 /* for ARC */
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#define W_TYPE_SIZE (4 * BITS_PER_UNIT)
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#define MIN_UNITS_PER_WORD UNITS_PER_WORD
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/* Work out the largest "word" size that we can deal with on this target. */
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#if MIN_UNITS_PER_WORD > 4
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# define LIBGCC2_MAX_UNITS_PER_WORD 8
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#elif (MIN_UNITS_PER_WORD > 2 \
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|| (MIN_UNITS_PER_WORD > 1 && __SIZEOF_LONG_LONG__ > 4))
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# define LIBGCC2_MAX_UNITS_PER_WORD 4
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#else
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# define LIBGCC2_MAX_UNITS_PER_WORD MIN_UNITS_PER_WORD
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#endif
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/* Work out what word size we are using for this compilation.
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The value can be set on the command line. */
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#ifndef LIBGCC2_UNITS_PER_WORD
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#define LIBGCC2_UNITS_PER_WORD LIBGCC2_MAX_UNITS_PER_WORD
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#endif
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typedef int QItype __attribute__ ((mode (QI)));
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typedef unsigned int UQItype __attribute__ ((mode (QI)));
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typedef int HItype __attribute__ ((mode (HI)));
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typedef unsigned int UHItype __attribute__ ((mode (HI)));
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#if MIN_UNITS_PER_WORD > 1
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/* These typedefs are usually forbidden on dsp's with UNITS_PER_WORD 1. */
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typedef int SItype __attribute__ ((mode (SI)));
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typedef unsigned int USItype __attribute__ ((mode (SI)));
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#if __SIZEOF_LONG_LONG__ > 4
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/* These typedefs are usually forbidden on archs with UNITS_PER_WORD 2. */
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typedef int DItype __attribute__ ((mode (DI)));
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typedef unsigned int UDItype __attribute__ ((mode (DI)));
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#if MIN_UNITS_PER_WORD > 4
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/* These typedefs are usually forbidden on archs with UNITS_PER_WORD 4. */
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typedef int TItype __attribute__ ((mode (TI)));
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typedef unsigned int UTItype __attribute__ ((mode (TI)));
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#endif
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#endif
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#endif
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#if LIBGCC2_UNITS_PER_WORD == 8
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#define W_TYPE_SIZE (8 * BITS_PER_UNIT)
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#define Wtype DItype
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#define UWtype UDItype
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#define HWtype DItype
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#define UHWtype UDItype
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#define DWtype TItype
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#define UDWtype UTItype
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#ifdef LIBGCC2_GNU_PREFIX
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#define __NW(a,b) __gnu_ ## a ## di ## b
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#define __NDW(a,b) __gnu_ ## a ## ti ## b
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#else
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#define __NW(a,b) __ ## a ## di ## b
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#define __NDW(a,b) __ ## a ## ti ## b
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#endif
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#elif LIBGCC2_UNITS_PER_WORD == 4
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#define W_TYPE_SIZE (4 * BITS_PER_UNIT)
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#define Wtype SItype
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#define UWtype USItype
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#define HWtype SItype
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#define UHWtype USItype
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#define DWtype DItype
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#define UDWtype UDItype
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#ifdef LIBGCC2_GNU_PREFIX
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#define __NW(a,b) __gnu_ ## a ## si ## b
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#define __NDW(a,b) __gnu_ ## a ## di ## b
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#else
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#define __NW(a,b) __ ## a ## si ## b
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#define __NDW(a,b) __ ## a ## di ## b
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#endif
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#elif LIBGCC2_UNITS_PER_WORD == 2
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#define W_TYPE_SIZE (2 * BITS_PER_UNIT)
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#define Wtype HItype
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#define UWtype UHItype
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#define HWtype HItype
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#define UHWtype UHItype
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#define DWtype SItype
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#define UDWtype USItype
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#ifdef LIBGCC2_GNU_PREFIX
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#define __NW(a,b) __gnu_ ## a ## hi ## b
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#define __NDW(a,b) __gnu_ ## a ## si ## b
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#else
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#define __NW(a,b) __ ## a ## hi ## b
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#define __NDW(a,b) __ ## a ## si ## b
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#endif
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#else
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#define W_TYPE_SIZE BITS_PER_UNIT
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#define Wtype QItype
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#define UWtype UQItype
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#define HWtype QItype
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#define UHWtype UQItype
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#define DWtype HItype
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#define UDWtype UHItype
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#ifdef LIBGCC2_GNU_PREFIX
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#define __NW(a,b) __gnu_ ## a ## qi ## b
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#define __NDW(a,b) __gnu_ ## a ## hi ## b
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#else
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#define __NW(a,b) __ ## a ## qi ## b
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#define __NDW(a,b) __ ## a ## hi ## b
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#endif
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#endif
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typedef int shift_count_type __attribute__((mode (__libgcc_shift_count__)));
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#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
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struct DWstruct {Wtype high, low;};
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#else
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struct DWstruct {Wtype low, high;};
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#endif
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/* We need this union to unpack/pack DImode values, since we don't have
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any arithmetic yet. Incoming DImode parameters are stored into the
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`ll' field, and the unpacked result is read from the struct `s'. */
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typedef union {
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struct DWstruct s;
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DWtype ll;
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} DWunion;
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#endif /* __ASM_LIBGCC_H */
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