track all live threads in an AS-safe, fully-consistent linked list

[musl] / src / env / __init_tls.c

diff --git a/src/env/__init_tls.c b/src/env/__init_tls.c
index b4df2ba..f1874f2 100644 (file)
--- a/src/env/__init_tls.c
+++ b/src/env/__init_tls.c
@@ -8,9 +8,8 @@
 #include "atomic.h"
 #include "syscall.h"
 
-#ifndef SHARED
-static
-#endif
+volatile int __thread_list_lock;
+
 int __init_tp(void *p)
 {
        pthread_t td = p;
@@ -18,14 +17,14 @@ int __init_tp(void *p)
        int r = __set_thread_area(TP_ADJ(p));
        if (r < 0) return -1;
        if (!r) libc.can_do_threads = 1;
-       td->tid = __syscall(SYS_set_tid_address, &td->tid);
+       td->detach_state = DT_JOINABLE;
+       td->tid = __syscall(SYS_set_tid_address, &__thread_list_lock);
        td->locale = &libc.global_locale;
        td->robust_list.head = &td->robust_list.head;
+       td->next = td->prev = td;
        return 0;
 }
 
-#ifndef SHARED
-
 static struct builtin_tls {
        char c;
        struct pthread pt;
@@ -33,33 +32,40 @@ static struct builtin_tls {
 } builtin_tls[1];
 #define MIN_TLS_ALIGN offsetof(struct builtin_tls, pt)
 
-struct tls_image {
-       void *image;
-       size_t len, size, align;
-} __static_tls;
-
-#define T __static_tls
+static struct tls_module main_tls;
 
 void *__copy_tls(unsigned char *mem)
 {
        pthread_t td;
-       if (!T.image) return mem;
-       void **dtv = (void *)mem;
-       dtv[0] = (void *)1;
+       struct tls_module *p;
+       size_t i;
+       uintptr_t *dtv;
+
 #ifdef TLS_ABOVE_TP
-       mem += sizeof(void *) * 2;
-       mem += -((uintptr_t)mem + sizeof(struct pthread)) & (T.align-1);
+       dtv = (uintptr_t*)(mem + libc.tls_size) - (libc.tls_cnt + 1);
+
+       mem += -((uintptr_t)mem + sizeof(struct pthread)) & (libc.tls_align-1);
        td = (pthread_t)mem;
        mem += sizeof(struct pthread);
+
+       for (i=1, p=libc.tls_head; p; i++, p=p->next) {
+               dtv[i] = (uintptr_t)(mem + p->offset) + DTP_OFFSET;
+               memcpy(mem + p->offset, p->image, p->len);
+       }
 #else
+       dtv = (uintptr_t *)mem;
+
        mem += libc.tls_size - sizeof(struct pthread);
-       mem -= (uintptr_t)mem & (T.align-1);
+       mem -= (uintptr_t)mem & (libc.tls_align-1);
        td = (pthread_t)mem;
-       mem -= T.size;
+
+       for (i=1, p=libc.tls_head; p; i++, p=p->next) {
+               dtv[i] = (uintptr_t)(mem - p->offset) + DTP_OFFSET;
+               memcpy(mem - p->offset, p->image, p->len);
+       }
 #endif
+       dtv[0] = libc.tls_cnt;
        td->dtv = td->dtv_copy = dtv;
-       dtv[1] = mem;
-       memcpy(mem, T.image, T.len);
        return td;
 }
 
@@ -69,7 +75,9 @@ typedef Elf32_Phdr Phdr;
 typedef Elf64_Phdr Phdr;
 #endif
 
-void __init_tls(size_t *aux)
+extern weak hidden const size_t _DYNAMIC[];
+
+static void static_init_tls(size_t *aux)
 {
        unsigned char *p;
        size_t n;
@@ -81,21 +89,43 @@ void __init_tls(size_t *aux)
                phdr = (void *)p;
                if (phdr->p_type == PT_PHDR)
                        base = aux[AT_PHDR] - phdr->p_vaddr;
+               if (phdr->p_type == PT_DYNAMIC && _DYNAMIC)
+                       base = (size_t)_DYNAMIC - phdr->p_vaddr;
                if (phdr->p_type == PT_TLS)
                        tls_phdr = phdr;
+               if (phdr->p_type == PT_GNU_STACK &&
+                   phdr->p_memsz > __default_stacksize)
+                       __default_stacksize =
+                               phdr->p_memsz < DEFAULT_STACK_MAX ?
+                               phdr->p_memsz : DEFAULT_STACK_MAX;
        }
 
        if (tls_phdr) {
-               T.image = (void *)(base + tls_phdr->p_vaddr);
-               T.len = tls_phdr->p_filesz;
-               T.size = tls_phdr->p_memsz;
-               T.align = tls_phdr->p_align;
+               main_tls.image = (void *)(base + tls_phdr->p_vaddr);
+               main_tls.len = tls_phdr->p_filesz;
+               main_tls.size = tls_phdr->p_memsz;
+               main_tls.align = tls_phdr->p_align;
+               libc.tls_cnt = 1;
+               libc.tls_head = &main_tls;
        }
 
-       T.size += (-T.size - (uintptr_t)T.image) & (T.align-1);
-       if (T.align < MIN_TLS_ALIGN) T.align = MIN_TLS_ALIGN;
+       main_tls.size += (-main_tls.size - (uintptr_t)main_tls.image)
+               & (main_tls.align-1);
+#ifdef TLS_ABOVE_TP
+       main_tls.offset = GAP_ABOVE_TP;
+       main_tls.offset += -GAP_ABOVE_TP & (main_tls.align-1);
+#else
+       main_tls.offset = main_tls.size;
+#endif
+       if (main_tls.align < MIN_TLS_ALIGN) main_tls.align = MIN_TLS_ALIGN;
 
-       libc.tls_size = 2*sizeof(void *)+T.size+T.align+sizeof(struct pthread);
+       libc.tls_align = main_tls.align;
+       libc.tls_size = 2*sizeof(void *) + sizeof(struct pthread)
+#ifdef TLS_ABOVE_TP
+               + main_tls.offset
+#endif
+               + main_tls.size + main_tls.align
+               + MIN_TLS_ALIGN-1 & -MIN_TLS_ALIGN;
 
        if (libc.tls_size > sizeof builtin_tls) {
 #ifndef SYS_mmap2
@@ -116,6 +146,5 @@ void __init_tls(size_t *aux)
        if (__init_tp(__copy_tls(mem)) < 0)
                a_crash();
 }
-#else
-void __init_tls(size_t *auxv) { }
-#endif
+
+weak_alias(static_init_tls, __init_tls);