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Cherrypicked some updated ARM64 Code

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Updating the entire project would be a lot of work. So for the time being, I will cherrypick some of ARM64 needed to suscessfully compile this project on my Pinebook Pro.
This commit is contained in:
Thomas A 2020-05-12 20:54:01 -07:00
parent 48342f3720
commit 3530e178e2
1 changed files with 9 additions and 22 deletions
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31
runtime/objc-os.h
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@ -136,45 +136,32 @@ subc(uintptr_t lhs, uintptr_t rhs, uintptr_t carryin, uintptr_t *carryout)
#if __arm64__
static ALWAYS_INLINE
uintptr_t
uintptr_t
LoadExclusive(uintptr_t *src)
{
uintptr_t result;
asm("ldxr %x0, [%x1]"
: "=r" (result)
: "r" (src), "m" (*src));
return result;
return __builtin_arm_ldrex(src);
}
static ALWAYS_INLINE
bool
bool
StoreExclusive(uintptr_t *dst, uintptr_t oldvalue __unused, uintptr_t value)
{
uint32_t result;
asm("stxr %w0, %x2, [%x3]"
: "=r" (result), "=m" (*dst)
: "r" (value), "r" (dst));
return !result;
return !__builtin_arm_strex(value, dst);
}
static ALWAYS_INLINE
bool
bool
StoreReleaseExclusive(uintptr_t *dst, uintptr_t oldvalue __unused, uintptr_t value)
{
uint32_t result;
asm("stlxr %w0, %x2, [%x3]"
: "=r" (result), "=m" (*dst)
: "r" (value), "r" (dst));
return !result;
return !__builtin_arm_stlex(value, dst);
}
static ALWAYS_INLINE
void
ClearExclusive(uintptr_t *dst)
void
ClearExclusive(uintptr_t *dst __unused)
{
// pretend it writes to *dst for instruction ordering purposes
asm("clrex" : "=m" (*dst));
__builtin_arm_clrex();
}