Module Name: src Committed By: matt Date: Mon Aug 6 01:49:27 UTC 2012
Added Files: src/lib/libc/arch/arm: aeabi.h Log Message: Mostly for reference, this header defines the "C" portion of the ARM run time API for AAPCS (EABI). To generate a diff of this commit: cvs rdiff -u -r0 -r1.1 src/lib/libc/arch/arm/aeabi.h Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.
Added files: Index: src/lib/libc/arch/arm/aeabi.h diff -u /dev/null src/lib/libc/arch/arm/aeabi.h:1.1 --- /dev/null Mon Aug 6 01:49:27 2012 +++ src/lib/libc/arch/arm/aeabi.h Mon Aug 6 01:49:27 2012 @@ -0,0 +1,198 @@ +/* $NetBSD: aeabi.h,v 1.1 2012/08/06 01:49:27 matt Exp $ */ + +/*- + * Copyright (c) 2012 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Matt Thomas of 3am Software Foundry. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ +#ifndef _ARM_AEABI_H_ +#define _ARM_AEABI_H_ + +#define __value_in_regs /* nothing */ + +/* + * Standard double precision floating-point arithmetic helper functions + */ +double __aeabi_dadd(double, double); // double-precision addition +double __aeabi_ddiv(double n, double d); // double-precision division, n / d +double __aeabi_dmul(double, double); // double-precision multiplication +double __aeabi_drsub(double x, double y); // double-precision reverse subtraction, y - x +double __aeabi_dsub(double x, double y); // double-precision subtraction, x - y +double __aeabi_dneg(double); // double-precision negation (obsolete, to be removed in r2.09) + +/* + * Double precision floating-point comparison helper functions + */ +void __aeabi_cdcmpeq(double, double); // non-excepting equality comparison [1], result in PSR ZC flags +void __aeabi_cdcmple(double, double); // 3-way (<, =, >) compare [1], result in PSR ZC flags +void __aeabi_cdrcmple(double, double); // reversed 3-way (<, =, >) compare [1], result in PSR ZC flags +int __aeabi_dcmpeq(double, double); // result (1, 0) denotes (=, <>) [2], use for C == and != +int __aeabi_dcmplt(double, double); // result (1, 0) denotes (<, >=) [2], use for C < +int __aeabi_dcmple(double, double); // result (1, 0) denotes (<=, >) [2], use for C <= +int __aeabi_dcmpge(double, double); // result (1, 0) denotes (>=, <) [2], use for C >= +int __aeabi_dcmpgt(double, double); // result (1, 0) denotes (>, <=) [2], use for C > +int __aeabi_dcmpun(double, double); // result (1, 0) denotes (?, <=>) [2], use for C99 isunordered() + +/* + * Standard single precision floating-point arithmetic helper functions + */ +float __aeabi_fadd(float, float); // single-precision addition +float __aeabi_fdiv(float n, float d); // single-precision division, n / d +float __aeabi_fmul(float, float); // single-precision multiplication +float __aeabi_frsub(float x, float y); // single-precision reverse subtraction, y - x +float __aeabi_fsub(float x, float y); // single-precision subtraction, x - y +float __aeabi_fneg(float); // single-precision negation (obsolete, to be removed in r2.09) + +/* + * Standard single precision floating-point comparison helper functions + */ +void __aeabi_cfcmpeq(float, float); // non-excepting equality comparison [1], result in PSR ZC flags +void __aeabi_cfcmple(float, float); // 3-way (<, =, ?>) compare [1], result in PSR ZC flags +void __aeabi_cfrcmple(float, float); // reversed 3-way (<, =, ?>) compare [1], result in PSR ZC flags +int __aeabi_fcmpeq(float, float); // result (1, 0) denotes (=, <>) [2], use for C == and != +int __aeabi_fcmplt(float, float); // result (1, 0) denotes (<, >=) [2], use for C < +int __aeabi_fcmple(float, float); // result (1, 0) denotes (<=, >) [2], use for C <= +int __aeabi_fcmpge(float, float); // result (1, 0) denotes (>=, <) [2], use for C >= +int __aeabi_fcmpgt(float, float); // result (1, 0) denotes (>, <=) [2], use for C > +int __aeabi_fcmpun(float, float); // result (1, 0) denotes (?, <=>) [2], use for C99 isunordered() + +/* + * Standard conversions between floating types + */ +float __aeabi_d2f(double); // double to float (single precision) conversion +double __aeabi_f2d(float); // float (single precision) to double conversion +float __aeabi_h2f(short hf); // IEEE 754 binary16 storage format (VFP half precision) to binary32 (float) conversion [4, 5] +short __aeabi_f2h(float f); // IEEE 754 binary32 (float) to binary16 storage format (VFP half precision) conversion [4, 6] +float __aeabi_h2f_alt(short hf); // __aeabi_h2f_alt converts from VFP alternative format [7]. +short __aeabi_f2h_alt(float f); // __aeabi_f2h_alt converts to VFP alternative format [8]. + +/* + * Standard floating-point to integer conversions + */ +int __aeabi_d2iz(double); // double to integer C-style conversion [3] +unsigned __aeabi_d2uiz(double); // double to unsigned C-style conversion [3] +long long __aeabi_d2lz(double); // double to long long C-style conversion [3] +unsigned long long __aeabi_d2ulz(double); // double to unsigned long long C-style conversion [3] +int __aeabi_f2iz(float); // float (single precision) to integer C-style conversion [3] +unsigned __aeabi_f2uiz(float); // float (single precision) to unsigned C-style conversion [3] +long long __aeabi_f2lz(float); // float (single precision) to long long C-style conversion [3] +unsigned long long __aeabi_f2ulz(float); // float to unsigned long long C-style conversion [3] + +/* + * Standard integer to floating-point conversions + */ +double __aeabi_i2d(int); // integer to double conversion +double __aeabi_ui2d(unsigned); // unsigned to double conversion +double __aeabi_l2d(long long); // long long to double conversion +double __aeabi_ul2d(unsigned long long); // unsigned long long to double conversion +float __aeabi_i2f(int); // integer to float (single precision) conversion +float __aeabi_ui2f(unsigned); // unsigned to float (single precision) conversion +float __aeabi_l2f(long long); // long long to float (single precision) conversion +float __aeabi_ul2f(unsigned long long); // unsigned long long to float (single precision) conversion + +/* + * Long long functions + */ +long long __aeabi_lmul(long long, long long); // multiplication + +/* + * A pair of (unsigned) long longs is returned in {{r0, r1}, {r2, r3}}, + * the quotient in {r0, r1}, and the remainder in {r2, r3}. + */ +typedef struct { long long quot; long long rem; } lldiv_t; +__value_in_regs lldiv_t __aeabi_ldivmod(long long n, long long d); // signed long long division and remainder, {q, r} = n / d [2] + +typedef struct { unsigned long long quot; unsigned long long rem; } ulldiv_t; +__value_in_regs ulldiv_t __aeabi_uldivmod(unsigned long long n, unsigned long long d); // unsigned signed ll division, remainder, {q, r} = n / d [2] + +/* + * Because of 2's complement number representation, these functions work + * identically with long long replaced uniformly by unsigned long long. + * Each returns its result in {r0, r1}, as specified by the [AAPCS]. + */ +long long __aeabi_llsl(long long, int); // logical shift left [1] +long long __aeabi_llsr(long long, int); // logical shift right [1] +long long __aeabi_lasr(long long, int); // arithmetic shift right [1] + +/* + * The comparison functions return negative, zero, or a positive integer + * according to whether the comparison result is <, ==, or >, respectively + * (like strcmp). + */ +int __aeabi_lcmp(long long, long long); // signed long long comparison +int __aeabi_ulcmp(unsigned long long, unsigned long long); // unsigned long long comparison + +int __aeabi_idiv(int numerator, int denominator); +unsigned __aeabi_uidiv(unsigned numerator, unsigned denominator); +typedef struct { int quot, rem; } idiv_return; +typedef struct { unsigned int quot, rem; } uidiv_return; +__value_in_regs idiv_return __aeabi_idivmod(int, int); +__value_in_regs uidiv_return __aeabi_uidivmod(unsigned int, unsigned int); + +/* + * Division by zero + * + * If an integer or long long division helper function is called upon to + * divide by 0, it should return as quotient the value returned by a call + * to __aeabi_idiv0 or __aeabi_ldiv0, respectively. A *divmod helper should + * return as remainder either 0 or the original numerator. + */ +int __aeabi_idiv0(int); +long long __aeabi_ldiv0(long long); + +/* + * These functions read and write 4-byte and 8-byte values at arbitrarily + * aligned addresses. Write functions return the value written, + * read functions the value read. + */ +int __aeabi_uread4(void *); +int __aeabi_uwrite4(int, void *); +long long __aeabi_uread8(void *); +long long __aeabi_uwrite8(long long, void *); + +/* + * Memory copying, clearing, and setting + */ +void __aeabi_memcpy8(void *, const void *, size_t); +void __aeabi_memcpy4(void *, const void *, size_t); +void __aeabi_memcpy(void *, const void *, size_t); +void __aeabi_memmove8(void *, const void *, size_t); +void __aeabi_memmove4(void *, const void *, size_t); +void __aeabi_memmove(void *, const void *, size_t); + +/* + * Memory clearing and setting + */ +void __aeabi_memset8(void *, size_t, int); +void __aeabi_memset4(void *, size_t, int); +void __aeabi_memset(void *, size_t, int); +void __aeabi_memclr8(void *, size_t); +void __aeabi_memclr4(void *, size_t); +void __aeabi_memclr(void *, size_t); + +void *__aeabi_read_tp(void); // return the value of $tp + +#endif /* _ARM_AEABI_H_ */