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5d3ad3b123
Intel MCU System V ABI are incompartible with i386 System V ABI:
o Minimum instruction set is Intel Pentium ISA minus x87 instructions
o No x87 or vector registers
o First three args are passed in %eax, %edx and %ecx
o Full specification available here:
https://github.com/hjl-tools/x86-psABI/wiki/iamcu-psABI-0.7.pdf
newlib/
* configure.host: Add new ix86-*-elfiamcu target
newlib/libc/include/
* setjmp.h: Change _JBLEN for Intel MCU target
newlib/libc/machine/i386/
* memchr.S: (memchr) Target-specific size-optimized version
* memcmp.S: (memcmp) Likewise
* memcpy.S: (memcpy) Likewise
* memmove.S: (memmove) Likewise
* memset.S: (memset) Likewise
* setjmp.S: (setjmp) Likewise
* strchr.S: (strchr) Likewise
* strlen.S: (strlen) Likewise
newlib/libc/stdlib/
* srtold.c: (__flt_rounds) Disable for Intel MCU
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*
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(C) Copyright IBM Corp. 2009
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of IBM nor the names of its contributors may be
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used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdlib.h>
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#include "local.h"
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#include "mprec.h"
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#undef FLT_ROUNDS
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#ifdef _HAVE_LONG_DOUBLE
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/* Intel MCU has no x87 floating point unit */
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#if (defined (__x86_64__) || defined (__i386__)) && !defined (__iamcu__)
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static const int map[] = {
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1, /* round to nearest */
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3, /* round to zero */
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2, /* round to negative infinity */
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0 /* round to positive infinity */
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};
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int
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__flt_rounds(void)
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{
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int x;
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/* Assume that the x87 and the SSE unit agree on the rounding mode. */
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__asm("fnstcw %0" : "=m" (x));
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return (map[(x >> 10) & 0x03]);
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}
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#define FLT_ROUNDS __flt_rounds()
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#else
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#define FLT_ROUNDS 0
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#endif
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long double
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_strtold_r (struct _reent *ptr, const char *__restrict s00,
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char **__restrict se)
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{
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#ifdef _LDBL_EQ_DBL
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/* On platforms where long double is as wide as double. */
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return _strtod_r (ptr, s00, se);
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#else
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long double result;
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_strtorx_r (ptr, s00, se, FLT_ROUNDS, &result);
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return result;
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#endif
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}
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long double
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strtold (const char *__restrict s00, char **__restrict se)
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{
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return _strtold_r (_REENT, s00, se);
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}
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#endif /* _HAVE_LONG_DOUBLE */
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