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23bb276fcd
Cooperate with the compiler to generate and execute the _init_array list of constructor functions on userspace program statup. This took two days to get working, my goodness. :^)
151 lines
3.5 KiB
C++
151 lines
3.5 KiB
C++
#include <AK/StdLibExtras.h>
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#include <AK/Assertions.h>
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#include <AK/Types.h>
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#include <AK/kstdio.h>
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extern "C" {
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void* mmx_memcpy(void* dest, const void* src, size_t len)
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{
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ASSERT(len >= 1024);
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auto* dest_ptr = (byte*)dest;
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auto* src_ptr = (const byte*)src;
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if ((dword)dest_ptr & 7) {
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dword prologue = 8 - ((dword)dest_ptr & 7);
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len -= prologue;
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asm volatile(
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"rep movsb\n"
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: "=S"(src_ptr), "=D"(dest_ptr), "=c"(prologue)
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: "0"(src_ptr), "1"(dest_ptr), "2"(prologue)
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: "memory"
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);
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}
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for (dword i = len / 64; i; --i) {
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asm volatile(
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"movq (%0), %%mm0\n"
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"movq 8(%0), %%mm1\n"
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"movq 16(%0), %%mm2\n"
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"movq 24(%0), %%mm3\n"
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"movq 32(%0), %%mm4\n"
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"movq 40(%0), %%mm5\n"
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"movq 48(%0), %%mm6\n"
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"movq 56(%0), %%mm7\n"
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"movq %%mm0, (%1)\n"
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"movq %%mm1, 8(%1)\n"
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"movq %%mm2, 16(%1)\n"
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"movq %%mm3, 24(%1)\n"
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"movq %%mm4, 32(%1)\n"
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"movq %%mm5, 40(%1)\n"
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"movq %%mm6, 48(%1)\n"
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"movq %%mm7, 56(%1)\n"
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:: "r" (src_ptr), "r" (dest_ptr) : "memory");
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src_ptr += 64;
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dest_ptr += 64;
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}
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asm volatile("emms":::"memory");
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// Whatever remains we'll have to memcpy.
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len %= 64;
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if (len)
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memcpy(dest_ptr, src_ptr, len);
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return dest;
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}
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#ifdef KERNEL
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static inline uint32_t divq(uint64_t n, uint32_t d)
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{
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uint32_t n1 = n >> 32;
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uint32_t n0 = n;
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uint32_t q;
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uint32_t r;
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asm volatile("divl %4" : "=d"(r), "=a"(q) : "0"(n1), "1"(n0), "rm"(d));
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return q;
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}
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static uint64_t unsigned_divide64(uint64_t n, uint64_t d)
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{
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if ((d >> 32) == 0) {
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uint64_t b = 1ULL << 32;
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uint32_t n1 = n >> 32;
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uint32_t n0 = n;
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uint32_t d0 = d;
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return divq(b * (n1 % d0) + n0, d0) + b * (n1 / d0);
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}
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if (n < d)
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return 0;
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uint32_t d1 = d >> 32u;
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int s = __builtin_clz(d1);
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uint64_t q = divq(n >> 1, (d << s) >> 32) >> (31 - s);
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return n - (q - 1) * d < d ? q - 1 : q;
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}
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static uint32_t unsigned_modulo64(uint64_t n, uint64_t d)
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{
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return n - d * unsigned_divide64(n, d);
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}
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static int64_t signed_divide64(int64_t n, int64_t d)
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{
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uint64_t n_abs = n >= 0 ? (uint64_t)n : -(uint64_t)n;
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uint64_t d_abs = d >= 0 ? (uint64_t)d : -(uint64_t)d;
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uint64_t q_abs = unsigned_divide64(n_abs, d_abs);
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return (n < 0) == (d < 0) ? (int64_t)q_abs : -(int64_t)q_abs;
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}
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static int32_t signed_modulo64(int64_t n, int64_t d)
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{
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return n - d * signed_divide64(n, d);
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}
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int64_t __divdi3(int64_t n, int64_t d)
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{
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return signed_divide64(n, d);
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}
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int64_t __moddi3(int64_t n, int64_t d)
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{
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return signed_modulo64(n, d);
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}
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uint64_t __udivdi3(uint64_t n, uint64_t d)
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{
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return unsigned_divide64(n, d);
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}
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uint64_t __umoddi3(uint64_t n, uint64_t d)
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{
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return unsigned_modulo64(n, d);
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}
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uint64_t __udivmoddi4(uint64_t n, uint64_t d, uint64_t* r)
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{
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uint64_t q = 0;
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uint64_t qbit = 1;
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if (!d)
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return 1 / ((unsigned)d);
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while ((int64_t)d >= 0) {
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d <<= 1;
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qbit <<= 1;
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}
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while (qbit) {
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if (d <= n) {
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n -= d;
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q += qbit;
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}
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d >>= 1;
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qbit >>= 1;
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}
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if (r)
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*r = n;
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return q;
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}
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#endif
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}
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