glibc_compat.cpp

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// Copyright (c) 2009-2017 The Bitcoin Core developers
// Copyright (c) 2017-2019 The PIVX developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#if defined(HAVE_CONFIG_H)
#include "config/prcycoin-config.h"
#endif
 
#include <cstddef>
#include <cstdint>
 
// Prior to GLIBC_2.14, memcpy was aliased to memmove.
extern "C" void* memmove(void* a, const void* b, size_t c);
extern "C" void* memcpy(void* a, const void* b, size_t c)
{
    return memmove(a, b, c);
}
 
extern "C" void __chk_fail(void) __attribute__((__noreturn__));
 
#if defined(__i386__) || defined(__arm__)
 
extern "C" int64_t __udivmoddi4(uint64_t u, uint64_t v, uint64_t* rp);
 
extern "C" int64_t __wrap___divmoddi4(int64_t u, int64_t v, int64_t* rp)
{
    int32_t c1 = 0, c2 = 0;
    int64_t uu = u, vv = v;
    int64_t w;
    int64_t r;
 
    if (uu < 0) {
        c1 = ~c1, c2 = ~c2, uu = -uu;
    }
    if (vv < 0) {
        c1 = ~c1, vv = -vv;
    }
 
    w = __udivmoddi4(uu, vv, (uint64_t*)&r);
    if (c1)
        w = -w;
    if (c2)
        r = -r;
 
    *rp = r;
    return w;
}
#endif
 
extern "C" float log2f_old(float x);
#ifdef __i386__
__asm(".symver log2f_old,log2f@GLIBC_2.1");
#elif defined(__amd64__)
__asm(".symver log2f_old,log2f@GLIBC_2.2.5");
#elif defined(__arm__)
__asm(".symver log2f_old,log2f@GLIBC_2.4");
#elif defined(__aarch64__)
__asm(".symver log2f_old,log2f@GLIBC_2.17");
#elif defined(__riscv)
__asm(".symver log2f_old,log2f@GLIBC_2.27");
#endif
extern "C" float __wrap_log2f(float x)
{
    return log2f_old(x);
}