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-rw-r--r--src/env/__init_tls.c71
-rw-r--r--src/env/__libc_start_main.c2
-rw-r--r--src/internal/libc.h1
-rw-r--r--src/ldso/dynlink.c10
-rw-r--r--src/thread/pthread_create.c23
-rw-r--r--src/thread/pthread_self.c24
6 files changed, 117 insertions, 14 deletions
diff --git a/src/env/__init_tls.c b/src/env/__init_tls.c
new file mode 100644
index 00000000..4a840cf2
--- /dev/null
+++ b/src/env/__init_tls.c
@@ -0,0 +1,71 @@
+#include <elf.h>
+#include <limits.h>
+#include "pthread_impl.h"
+#include "libc.h"
+#include "atomic.h"
+
+#ifndef SHARED
+
+static void *image;
+static size_t len, bss, align;
+
+void *__copy_tls(unsigned char *mem, size_t cnt)
+{
+ mem += ((uintptr_t)image - (uintptr_t)mem) & (align-1);
+ memcpy(mem, image, len);
+ return mem + len + bss;
+}
+
+static void *simple(void *p)
+{
+ *(void **)p = p;
+ return __set_thread_area(p) ? 0 : p;
+}
+
+weak_alias(simple, __install_initial_tls);
+
+void *__mmap(void *, size_t, int, int, int, off_t);
+
+#if ULONG_MAX == 0xffffffff
+typedef Elf32_Phdr Phdr;
+#else
+typedef Elf64_Phdr Phdr;
+#endif
+
+#define AUX_CNT 6
+
+void __init_tls(size_t *auxv)
+{
+ size_t i, aux[AUX_CNT] = { 0 };
+ unsigned char *p, *mem;
+ size_t n, d;
+ Phdr *phdr, *tls_phdr=0;
+ size_t base = 0;
+
+ for (; auxv[0]; auxv+=2) if (auxv[0]<AUX_CNT) aux[auxv[0]] = auxv[1];
+ p = (void *)aux[AT_PHDR];
+ for (p=(void *)aux[AT_PHDR]; aux[AT_PHNUM]--; p+=aux[AT_PHENT]) {
+ phdr = (void *)p;
+ if (phdr->p_type == PT_PHDR)
+ base = aux[AT_PHDR] - phdr->p_vaddr;
+ if (phdr->p_type == PT_TLS)
+ tls_phdr = phdr;
+ }
+ if (!tls_phdr) return;
+
+ libc.tls_size = len+bss+align+4*sizeof(size_t)+sizeof(struct pthread);
+
+ image = (void *)(base + tls_phdr->p_vaddr);
+ len = tls_phdr->p_filesz;
+ bss = tls_phdr->p_memsz - len;
+ align = tls_phdr->p_align;
+ if (align < 4*sizeof(size_t)) align = 4*sizeof(size_t);
+ mem = __mmap(0, libc.tls_size, PROT_READ|PROT_WRITE,
+ MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+ if (mem == MAP_FAILED) a_crash();
+
+ if (!__install_initial_tls(__copy_tls(mem, 0))) a_crash();
+}
+#else
+void __init_tls(size_t *auxv) { }
+#endif
diff --git a/src/env/__libc_start_main.c b/src/env/__libc_start_main.c
index f31222b2..a38569d5 100644
--- a/src/env/__libc_start_main.c
+++ b/src/env/__libc_start_main.c
@@ -1,5 +1,6 @@
#include "libc.h"
+void __init_tls(size_t *);
void __init_security(size_t *);
int __libc_start_main(
@@ -15,6 +16,7 @@ int __libc_start_main(
libc.ldso_fini = ldso_fini;
libc.fini = fini;
+ __init_tls((void *)auxv);
__init_security((void *)auxv);
/* Execute constructors (static) linked into the application */
diff --git a/src/internal/libc.h b/src/internal/libc.h
index ea863d67..ca06f319 100644
--- a/src/internal/libc.h
+++ b/src/internal/libc.h
@@ -16,6 +16,7 @@ struct __libc {
int canceldisable;
FILE *ofl_head;
int ofl_lock[2];
+ volatile size_t tls_size, tls_cnt;
};
extern size_t __hwcap;
diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index 960e0898..1447e205 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -17,6 +17,9 @@
#include <pthread.h>
#include <ctype.h>
#include <dlfcn.h>
+#include "pthread_impl.h"
+#include "libc.h"
+#undef libc
static int errflag;
static char errbuf[128];
@@ -788,6 +791,8 @@ void *__dynlink(int argc, char **argv)
debug.state = 0;
_dl_debug_state();
+ /* Stand-in until real TLS support is added to dynamic linker */
+ __libc.tls_size = sizeof(struct pthread) + 4*sizeof(size_t);
if (ssp_used) __init_ssp(auxv);
do_init_fini(tail);
@@ -802,6 +807,11 @@ void *__dynlink(int argc, char **argv)
return (void *)aux[AT_ENTRY];
}
+void *__copy_tls(unsigned char *mem, size_t cnt)
+{
+ return mem;
+}
+
void *dlopen(const char *file, int mode)
{
struct dso *volatile p, *orig_tail = tail, *next;
diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index d8b8f0fc..f53fc1ba 100644
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -84,6 +84,8 @@ static void init_file_lock(FILE *f)
if (f && f->lock<0) f->lock = 0;
}
+void *__copy_tls(unsigned char *, size_t);
+
int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attr, void *(*entry)(void *), void *restrict arg)
{
int ret;
@@ -92,6 +94,8 @@ int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attr,
struct pthread *self = pthread_self(), *new;
unsigned char *map, *stack, *tsd;
unsigned flags = 0x7d8f00;
+ size_t tls_cnt = libc.tls_cnt;
+ size_t tls_size = libc.tls_size;
if (!self) return ENOSYS;
if (!libc.threaded) {
@@ -109,15 +113,24 @@ int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attr,
} else {
if (attr) {
guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE);
- size = guard + ROUND(attr->_a_stacksize + DEFAULT_STACK_SIZE);
+ size = guard + ROUND(attr->_a_stacksize
+ + DEFAULT_STACK_SIZE + tls_size);
}
size += __pthread_tsd_size;
- map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
- if (map == MAP_FAILED) return EAGAIN;
- if (guard) mprotect(map, guard, PROT_NONE);
+ if (guard) {
+ map = mmap(0, size, PROT_NONE, MAP_PRIVATE|MAP_ANON, -1, 0);
+ if (map == MAP_FAILED) return EAGAIN;
+ if (mprotect(map+guard, size-guard, PROT_READ|PROT_WRITE)) {
+ munmap(map, size);
+ return EAGAIN;
+ }
+ } else {
+ map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
+ if (map == MAP_FAILED) return EAGAIN;
+ }
tsd = map + size - __pthread_tsd_size;
}
- new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new);
+ new = __copy_tls(tsd - tls_size, tls_cnt);
new->map_base = map;
new->map_size = size;
new->pid = self->pid;
diff --git a/src/thread/pthread_self.c b/src/thread/pthread_self.c
index a8cc80b5..a93d8129 100644
--- a/src/thread/pthread_self.c
+++ b/src/thread/pthread_self.c
@@ -1,6 +1,6 @@
#include "pthread_impl.h"
-static struct pthread main_thread;
+static struct pthread *main_thread = &(struct pthread){0};
/* pthread_key_create.c overrides this */
static const void *dummy[1] = { 0 };
@@ -10,14 +10,14 @@ static int init_main_thread()
{
__syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
SIGPT_SET, 0, __SYSCALL_SSLEN);
- if (__set_thread_area(&main_thread) < 0) return -1;
- main_thread.canceldisable = libc.canceldisable;
- main_thread.tsd = (void **)__pthread_tsd_main;
- main_thread.errno_ptr = __errno_location();
- main_thread.self = &main_thread;
- main_thread.tid = main_thread.pid =
- __syscall(SYS_set_tid_address, &main_thread.tid);
- libc.main_thread = &main_thread;
+ if (__set_thread_area(main_thread) < 0) return -1;
+ main_thread->canceldisable = libc.canceldisable;
+ main_thread->tsd = (void **)__pthread_tsd_main;
+ main_thread->errno_ptr = __errno_location();
+ main_thread->self = main_thread;
+ main_thread->tid = main_thread->pid =
+ __syscall(SYS_set_tid_address, &main_thread->tid);
+ libc.main_thread = main_thread;
return 0;
}
@@ -35,3 +35,9 @@ pthread_t __pthread_self_def()
weak_alias(__pthread_self_def, pthread_self);
weak_alias(__pthread_self_def, __pthread_self_init);
+
+void *__install_initial_tls(void *p)
+{
+ main_thread = p;
+ return __pthread_self_def();
+}
generated by cgit v1.2.1 (git 2.18.0) at 2025-10-31 17:29:04 +0000