diff options
Diffstat (limited to 'linuxthreads/manager.c')
| -rw-r--r-- | linuxthreads/manager.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/linuxthreads/manager.c b/linuxthreads/manager.c index d436b08f16..38596ce957 100644 --- a/linuxthreads/manager.c +++ b/linuxthreads/manager.c @@ -32,6 +32,7 @@ #include "spinlock.h" #include "restart.h" #include "semaphore.h" +#include <stackinfo.h> /* Array of active threads. Entry 0 is reserved for the initial thread. */ struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX] = @@ -313,6 +314,13 @@ static int pthread_allocate_stack(const pthread_attr_t *attr, if (attr != NULL && attr->__stackaddr_set) { +#ifdef _STACK_GROWS_UP + /* The user provided a stack. */ + new_thread = (pthread_descr) attr->__stackaddr; + new_thread_bottom = (char *) (new_thread + 1); + guardaddr = attr->__stackaddr + attr->__stacksize; + guardsize = 0; +#else /* The user provided a stack. For now we interpret the supplied address as 1 + the highest addr. in the stack segment. If a separate register stack is needed, we place it at the low end @@ -328,6 +336,7 @@ static int pthread_allocate_stack(const pthread_attr_t *attr, new_thread_bottom = (char *) attr->__stackaddr - attr->__stacksize; guardaddr = new_thread_bottom; guardsize = 0; +#endif #ifndef THREAD_SELF __pthread_nonstandard_stacks = 1; #endif @@ -423,12 +432,23 @@ static int pthread_allocate_stack(const pthread_attr_t *attr, /* No more memory available. */ return -1; +# ifdef _STACK_GROWS_DOWN guardaddr = map_addr; if (guardsize > 0) mprotect (guardaddr, guardsize, PROT_NONE); new_thread_bottom = (char *) map_addr + guardsize; new_thread = ((pthread_descr) (new_thread_bottom + stacksize)) - 1; +# elif _STACK_GROWS_UP + guardaddr = map_addr + stacksize; + if (guardsize > 0) + mprotect (guardaddr, guardsize, PROT_NONE); + + new_thread = (pthread_descr) map_addr; + new_thread_bottom = (char *) (new_thread + 1); +# else +# error You must define a stack direction +# endif /* Stack direction */ # else /* !FLOATING_STACKS */ void *res_addr; @@ -445,6 +465,7 @@ static int pthread_allocate_stack(const pthread_attr_t *attr, stacksize = STACK_SIZE - granularity; } +# ifdef _STACK_GROWS_DOWN new_thread = default_new_thread; new_thread_bottom = (char *) (new_thread + 1) - stacksize; map_addr = new_thread_bottom - guardsize; @@ -464,6 +485,23 @@ static int pthread_allocate_stack(const pthread_attr_t *attr, guardaddr = map_addr; if (guardsize > 0) mprotect (guardaddr, guardsize, PROT_NONE); +# else + /* The thread description goes at the bottom of this area, and + * the stack starts directly above it. + */ + new_thread = (pthread_descr)((unsigned long)default_new_thread &~ (STACK_SIZE - 1)); + map_addr = mmap(new_thread, stacksize + guardsize, + PROT_READ | PROT_WRITE | PROT_EXEC, + MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + if (map_addr == MAP_FAILED) + return -1; + + new_thread_bottom = map_addr + sizeof(*new_thread); + guardaddr = map_addr + stacksize; + if (guardsize > 0) + mprotect (guardaddr, guardsize, PROT_NONE); + +# endif /* stack direction */ # endif #endif /* !NEED_SEPARATE_REGISTER_STACK */ } @@ -591,6 +629,10 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, (char *)new_thread - new_thread_bottom, CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | __pthread_sig_cancel, new_thread); +#elif _STACK_GROWS_UP + pid = __clone(pthread_start_thread_event, (void **) new_thread_bottom, + CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | + __pthread_sig_cancel, new_thread); #else pid = __clone(pthread_start_thread_event, (void **) new_thread, CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | @@ -627,6 +669,10 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, (char *)new_thread - new_thread_bottom, CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | __pthread_sig_cancel, new_thread); +#elif _STACK_GROWS_UP + pid = __clone(pthread_start_thread, (void **) new_thread_bottom, + CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | + __pthread_sig_cancel, new_thread); #else pid = __clone(pthread_start_thread, (void **) new_thread, CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | @@ -643,6 +689,9 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, - new_thread_bottom); munmap((caddr_t)new_thread_bottom, 2 * stacksize + new_thread->p_guardsize); +#elif _STACK_GROWS_UP + size_t stacksize = guardaddr - (char *)new_thread; + munmap(new_thread, stacksize + guardsize); #else size_t stacksize = (char *)(new_thread+1) - new_thread_bottom; munmap(new_thread_bottom - guardsize, guardsize + stacksize); @@ -708,6 +757,10 @@ static void pthread_free(pthread_descr th) size_t guardsize = th->p_guardsize; /* Free the stack and thread descriptor area */ char *guardaddr = th->p_guardaddr; +#ifdef _STACK_GROWS_UP + size_t stacksize = guardaddr - (char *)th; + guardaddr = (char *)th; +#else /* Guardaddr is always set, even if guardsize is 0. This allows us to compute everything else. */ size_t stacksize = (char *)(th+1) - guardaddr - guardsize; @@ -716,6 +769,7 @@ static void pthread_free(pthread_descr th) guardaddr -= stacksize; stacksize *= 2; #endif +#endif /* Unmap the stack. */ munmap(guardaddr, stacksize + guardsize); } |