RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-14 09:24:57 +00:00
Code Issues Activity Actions

LibC: Remove i686 support

Browse source
This commit is contained in:
Liav A 2022-10-04 02:52:43 +03:00 • committed by Andreas Kling
parent 85b453c2e4
commit 92da98822a
11 changed files with 9 additions and 169 deletions
Download patch file Download diff file Expand all files Collapse all files

30
Userland/Libraries/LibC/string.cpp
View file

@ -130,7 +130,7 @@ int timingsafe_memcmp(void const* b1, void const* b2, size_t len)
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/memcpy.html
void* memcpy(void* dest_ptr, void const* src_ptr, size_t n)
{
#if ARCH(I386) || ARCH(X86_64)
#if ARCH(X86_64)
void* original_dest = dest_ptr;
asm volatile(
"rep movsb"
@ -146,34 +146,9 @@ void* memcpy(void* dest_ptr, void const* src_ptr, size_t n)
#endif
}
#if ARCH(I386)
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/memset.html
void* memset(void* dest_ptr, int c, size_t n)
{
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);
asm volatile(
"rep stosl\n"
: "=D"(dest)
: "D"(dest), "c"(size_ts), "a"(expanded_c)
: "memory");
n -= size_ts * sizeof(size_t);
if (n == 0)
return dest_ptr;
}
asm volatile(
"rep stosb\n"
: "=D"(dest), "=c"(n)
: "0"(dest), "1"(n), "a"(c)
: "memory");
return dest_ptr;
}
#elif ARCH(X86_64)
// For x86-64, an optimized ASM implementation is found in ./arch/x86_64/memset.S
#elif ARCH(AARCH64)
#if ARCH(AARCH64)
void* memset(void* dest_ptr, int c, size_t n)
{
(void)dest_ptr;
@ -181,6 +156,7 @@ void* memset(void* dest_ptr, int c, size_t n)
(void)n;
TODO_AARCH64();
}
#elif ARCH(X86_64)
#else
# error Unknown architecture
#endif