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Complete the Windows TLS fix made in e437bed00

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Justine Tunney 2024-07-01 06:42:35 -07:00
parent 72511ff0ac
commit 61370983e1
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GPG key ID: BE714B4575D6E328
1 changed files with 17 additions and 14 deletions
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31
libc/runtime/enable_tls.c
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@ -141,24 +141,23 @@ textstartup void __enable_tls(void) {
size_t siz = ROUNDUP(I(_tls_size) + sizeof(struct CosmoTib), TLS_ALIGNMENT); size_t siz = ROUNDUP(I(_tls_size) + sizeof(struct CosmoTib), TLS_ALIGNMENT);
if (siz <= sizeof(__static_tls)) { if (siz <= sizeof(__static_tls)) {
// if tls requirement is small then use the static tls block // if tls requirement is small then use the static tls block
// which helps avoid a system call for appes with little tls // which helps avoid a system call for apes with little tls.
// this is crucial to keeping life.com 16 kilobytes in size! // this is crucial to keeping life.com 16 kilobytes in size!
mem = __static_tls; mem = __static_tls;
} else { } else {
// if this binary needs a hefty tls block then we'll bank on // if a binary needs this much thread_local storage, then it
// malloc() being linked, which links _mapanon(). otherwise // surely must have linked the mmap() function at some point
// if you exceed this, you need to __static_yoink("_mapanon"). // we can't call mmap() because it's too early for sig block
// please note that it's probably too early to call calloc() mem = _weaken(__mmap)(0, siz, PROT_READ | PROT_WRITE,
mem = _weaken(_mapanon)(siz); MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
} }
struct CosmoTib *tib = (struct CosmoTib *)(mem + siz - sizeof(*tib)); struct CosmoTib *tib = (struct CosmoTib *)(mem + siz - sizeof(*tib));
char *tls = mem + siz - sizeof(*tib) - I(_tls_size); char *tls = mem + siz - sizeof(*tib) - I(_tls_size);
// copy in initialized data section // copy in initialized data section
if (I(_tdata_size)) { if (I(_tdata_size))
memcpy(tls, _tdata_start, I(_tdata_size)); memcpy(tls, _tdata_start, I(_tdata_size));
}
#elif defined(__aarch64__) #elif defined(__aarch64__)
@ -169,10 +168,16 @@ textstartup void __enable_tls(void) {
char *mem; char *mem;
if (I(_tls_align) <= TLS_ALIGNMENT && size <= sizeof(__static_tls)) { if (I(_tls_align) <= TLS_ALIGNMENT && size <= sizeof(__static_tls)) {
// if tls requirement is small then use the static tls block
// which helps avoid a system call for apes with little tls.
// this is crucial to keeping life.com 16 kilobytes in size!
mem = __static_tls; mem = __static_tls;
} else { } else {
mem = __mmap(0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, // if a binary needs this much thread_local storage, then it
-1, 0); // surely must have linked the mmap() function at some point
// we can't call mmap() because it's too early for sig block
mem = _weaken(__mmap)(0, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
} }
struct CosmoTib *tib = struct CosmoTib *tib =
@ -184,9 +189,8 @@ textstartup void __enable_tls(void) {
size_t dtv_size = sizeof(uintptr_t) * 2; size_t dtv_size = sizeof(uintptr_t) * 2;
char *tdata = (char *)dtv + ROUNDUP(dtv_size, I(_tdata_align)); char *tdata = (char *)dtv + ROUNDUP(dtv_size, I(_tdata_align));
if (I(_tdata_size)) { if (I(_tdata_size))
memmove(tdata, _tdata_start, I(_tdata_size)); memmove(tdata, _tdata_start, I(_tdata_size));
}
// Set the DTV. // Set the DTV.
// //
@ -251,9 +255,8 @@ textstartup void __enable_tls(void) {
#ifdef __x86_64__ #ifdef __x86_64__
// rewrite the executable tls opcodes in memory // rewrite the executable tls opcodes in memory
if (IsWindows() || IsOpenbsd() || IsNetbsd()) { if (IsWindows() || IsOpenbsd() || IsNetbsd())
__morph_tls(); __morph_tls();
}
#endif #endif
// we are now allowed to use tls // we are now allowed to use tls