RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 12:28:12 +00:00
Code Issues Activity Actions

Kernel: Build MiniStdLib.cpp in aarch64 builds

Browse source
This commit is contained in:
Nico Weber 2021-09-06 20:49:38 -04:00 • committed by Linus Groh
parent 208aa05cf3
commit a8d96df8e0
2 changed files with 20 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

25
Kernel/MiniStdLib.cpp
View file

@ -10,24 +10,25 @@ extern "C" {
void* memcpy(void* dest_ptr, const void* src_ptr, size_t n)
{
#if ARCH(I386) || ARCH(X86_64)
size_t dest = (size_t)dest_ptr;
size_t src = (size_t)src_ptr;
// FIXME: Support starting at an unaligned address.
if (!(dest & 0x3) && !(src & 0x3) && n >= 12) {
size_t size_ts = n / sizeof(size_t);
#if ARCH(I386)
# if ARCH(I386)
asm volatile(
"rep movsl\n"
: "=S"(src), "=D"(dest)
: "S"(src), "D"(dest), "c"(size_ts)
: "memory");
#else
# else
asm volatile(
"rep movsq\n"
: "=S"(src), "=D"(dest)
: "S"(src), "D"(dest), "c"(size_ts)
: "memory");
#endif
# endif
n -= size_ts * sizeof(size_t);
if (n == 0)
return dest_ptr;
@ -35,6 +36,12 @@ void* memcpy(void* dest_ptr, const void* src_ptr, size_t n)
asm volatile(
"rep movsb\n" ::"S"(src), "D"(dest), "c"(n)
: "memory");
#else
u8* pd = (u8*)dest_ptr;
u8 const* ps = (u8 const*)src_ptr;
for (; n--;)
*pd++ = *ps++;
#endif
return dest_ptr;
}
@ -52,24 +59,25 @@ void* memmove(void* dest, const void* src, size_t n)
void* memset(void* dest_ptr, int c, size_t n)
{
#if ARCH(I386) || ARCH(X86_64)
size_t dest = (size_t)dest_ptr;
// FIXME: Support starting at an unaligned address.
if (!(dest & 0x3) && n >= 12) {
size_t size_ts = n / sizeof(size_t);
size_t expanded_c = explode_byte((u8)c);
#if ARCH(I386)
# if ARCH(I386)
asm volatile(
"rep stosl\n"
: "=D"(dest)
: "D"(dest), "c"(size_ts), "a"(expanded_c)
: "memory");
#else
# else
asm volatile(
"rep stosq\n"
: "=D"(dest)
: "D"(dest), "c"(size_ts), "a"(expanded_c)
: "memory");
#endif
# endif
n -= size_ts * sizeof(size_t);
if (n == 0)
return dest_ptr;
@ -79,6 +87,11 @@ void* memset(void* dest_ptr, int c, size_t n)
: "=D"(dest), "=c"(n)
: "0"(dest), "1"(n), "a"(c)
: "memory");
#else
u8* pd = (u8*)dest_ptr;
for (; n--;)
*pd++ = c;
#endif
return dest_ptr;
}