123 lines
2.5 KiB
C
123 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Library for freestanding binary
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*
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* Copyright 2019, Heinrich Schuchardt <xypron.glpk@gmx.de>
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*
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* GCC requires that freestanding programs provide memcpy(), memmove(),
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* memset(), and memcmp().
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*/
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#include <common.h>
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/**
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* memcmp() - compare memory areas
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*
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* @s1: pointer to first area
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* @s2: pointer to second area
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* @n: number of bytes to compare
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* Return: 0 if both memory areas are the same, otherwise the sign of the
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* result value is the same as the sign of the difference between
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* the first differing pair of bytes taken as u8.
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*/
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int memcmp(const void *s1, const void *s2, size_t n)
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{
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const u8 *pos1 = s1;
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const u8 *pos2 = s2;
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for (; n; --n) {
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if (*pos1 != *pos2)
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return *pos1 - *pos2;
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++pos1;
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++pos2;
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}
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return 0;
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}
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/**
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* memcpy() - copy memory area
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*
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* @dest: destination buffer
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* @src: source buffer
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* @n: number of bytes to copy
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* Return: pointer to destination buffer
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*/
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void *memmove(void *dest, const void *src, size_t n)
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{
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u8 *d = dest;
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const u8 *s = src;
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if (d <= s) {
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for (; n; --n)
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*d++ = *s++;
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} else {
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d += n;
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s += n;
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for (; n; --n)
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*--d = *--s;
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}
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return dest;
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}
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/**
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* memcpy() - copy memory area
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*
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* @dest: destination buffer
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* @src: source buffer
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* @n: number of bytes to copy
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* Return: pointer to destination buffer
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*/
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void *memcpy(void *dest, const void *src, size_t n)
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{
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return memmove(dest, src, n);
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}
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/**
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* memset() - fill memory with a constant byte
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*
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* @s: destination buffer
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* @c: byte value
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* @n: number of bytes to set
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* Return: pointer to destination buffer
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*/
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void *memset(void *s, int c, size_t n)
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{
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u8 *d = s;
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for (; n; --n)
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*d++ = c;
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return s;
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}
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/**
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* __cyg_profile_func_enter() - record function entry
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*
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* This is called on every function entry when compiling with
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* -finstrument-functions.
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*
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* We do nothing here.
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*
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* @param func_ptr Pointer to function being entered
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* @param caller Pointer to function which called this function
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*/
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void __attribute__((no_instrument_function))
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__cyg_profile_func_enter(void *func_ptr, void *caller)
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{
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}
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/**
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* __cyg_profile_func_exit() - record function exit
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*
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* This is called on every function exit when compiling with
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* -finstrument-functions.
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*
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* We do nothing here.
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*
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* @param func_ptr Pointer to function being entered
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* @param caller Pointer to function which called this function
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*/
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void __attribute__((no_instrument_function))
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__cyg_profile_func_exit(void *func_ptr, void *caller)
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{
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}
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