summaryrefslogtreecommitdiff
path: root/src/thread
diff options
context:
space:
mode:
authorRich Felker <dalias@aerifal.cx>2012-10-15 18:51:53 -0400
committerRich Felker <dalias@aerifal.cx>2012-10-15 18:51:53 -0400
commit9ec4283b28cf676292fd5c6f681bef1e90e30c18 (patch)
tree2897be56744c39158a3e53adfc4e3569b3f8547d /src/thread
parentd5304147b983f309ed0c9050e3b8b6f2c9f87f43 (diff)
downloadmusl-9ec4283b28cf676292fd5c6f681bef1e90e30c18.tar.gz
add support for TLS variant I, presently needed for arm and mips
despite documentation that makes it sound a lot different, the only ABI-constraint difference between TLS variants II and I seems to be that variant II stores the initial TLS segment immediately below the thread pointer (i.e. the thread pointer points to the end of it) and variant I stores the initial TLS segment above the thread pointer, requiring the thread descriptor to be stored below. the actual value stored in the thread pointer register also tends to have per-arch random offsets applied to it for silly micro-optimization purposes. with these changes applied, TLS should be basically working on all supported archs except microblaze. I'm still working on getting the necessary information and a working toolchain that can build TLS binaries for microblaze, but in theory, static-linked programs with TLS and dynamic-linked programs where only the main executable uses TLS should already work on microblaze. alignment constraints have not yet been heavily tested, so it's possible that this code does not always align TLS segments correctly on archs that need TLS variant I.
Diffstat (limited to 'src/thread')
-rw-r--r--src/thread/arm/tls.s4
-rw-r--r--src/thread/pthread_create.c2
-rw-r--r--src/thread/pthread_self.c2
3 files changed, 6 insertions, 2 deletions
diff --git a/src/thread/arm/tls.s b/src/thread/arm/tls.s
new file mode 100644
index 00000000..59736ac2
--- /dev/null
+++ b/src/thread/arm/tls.s
@@ -0,0 +1,4 @@
+.global __aeabi_read_tp
+.type __aeabi_read_tp,%function
+__aeabi_read_tp:
+ ldr pc,=0xffff0fe0
diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index 627ff5fb..e67616e7 100644
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -147,7 +147,7 @@ int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attr,
new->canary = self->canary;
a_inc(&libc.threads_minus_1);
- ret = __clone(start, stack, flags, new, &new->tid, new, &new->tid);
+ ret = __clone(start, stack, flags, new, &new->tid, TP_ADJ(new), &new->tid);
__release_ptc();
diff --git a/src/thread/pthread_self.c b/src/thread/pthread_self.c
index a93d8129..23dbaa5e 100644
--- a/src/thread/pthread_self.c
+++ b/src/thread/pthread_self.c
@@ -10,7 +10,7 @@ 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;
+ if (__set_thread_area(TP_ADJ(main_thread)) < 0) return -1;
main_thread->canceldisable = libc.canceldisable;
main_thread->tsd = (void **)__pthread_tsd_main;
main_thread->errno_ptr = __errno_location();