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Make _Thread_local more seamlessly working

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This commit is contained in:
Justine Tunney 2022-07-10 08:27:50 -07:00
parent 5f4f6b0e69
commit 5fa77f1e8f
23 changed files with 217 additions and 283 deletions
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26
libc/runtime/clone.c
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@ -64,10 +64,7 @@ struct CloneArgs {
uint32_t utid;
int64_t tid64;
};
union {
char lock;
void *oldrsp;
};
char lock;
int *ptid;
int *ctid;
int *ztid;
@ -287,6 +284,15 @@ static int CloneFreebsd(int (*func)(void *, int), char *stk, size_t stksz,
////////////////////////////////////////////////////////////////////////////////
// OPEN BESIYATA DISHMAYA
static void *oldrsp;
__attribute__((__constructor__)) static void OpenbsdGetSafeRsp(void) {
// main thread stack should never be freed during process lifetime. we
// won't actually change this stack below. we just need need a place
// where threads can park RSP for a few instructions while dying.
oldrsp = __builtin_frame_address(0);
}
static wontreturn void OpenbsdThreadMain(void *p) {
struct CloneArgs *wt = p;
*wt->ptid = wt->tid;
@ -303,7 +309,7 @@ static wontreturn void OpenbsdThreadMain(void *p) {
"movl\t$0,(%%rdi)\n\t" // *wt->ztid = 0
"syscall" // __threxit()
: "=m"(*wt->ztid)
: "a"(302), "m"(wt->oldrsp), "D"(wt->ztid)
: "a"(302), "m"(oldrsp), "D"(wt->ztid)
: "rcx", "r11", "memory");
unreachable;
}
@ -325,7 +331,6 @@ static int CloneOpenbsd(int (*func)(void *, int), char *stk, size_t stksz,
wt->ptid = flags & CLONE_PARENT_SETTID ? ptid : &wt->tid;
wt->ctid = flags & CLONE_CHILD_SETTID ? ctid : &wt->tid;
wt->ztid = flags & CLONE_CHILD_CLEARTID ? ctid : &wt->tid;
wt->oldrsp = __builtin_frame_address(0);
wt->arg = arg;
wt->func = func;
tf->tf_stack = (char *)wt - 8;
@ -591,13 +596,8 @@ int clone(void *func, void *stk, size_t stksz, int flags, void *arg, int *ptid,
int rc;
struct CloneArgs *wt;
if ((flags & CLONE_SETTLS) && !__tls_enabled) {
__enable_tls();
}
if ((flags & CLONE_THREAD) && !__threaded) {
__enable_threads();
}
if (flags & CLONE_SETTLS) __enable_tls();
if (flags & CLONE_THREAD) __enable_threads();
if (!func) {
rc = einval();