[git commit prelink 1/1] nptl: fix start_thread() for _STACK_GROWS_UP

Will Newton will.newton at imgtec.com
Thu Jan 27 15:11:14 UTC 2011


commit: http://git.uclibc.org/uClibc/commit/?id=5c02df4f734011cccc65441e5dae2f5c18447f39
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/prelink

This patch adds a working implementation of pthread_create for architectures
where STACK_GROWS_UP.

Signed-off-by: Matt Fleming <matthew.fleming at imgtec.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso at st.com>
---
 libpthread/nptl/pthread_create.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libpthread/nptl/pthread_create.c b/libpthread/nptl/pthread_create.c
index 63e5588..86ff148 100644
--- a/libpthread/nptl/pthread_create.c
+++ b/libpthread/nptl/pthread_create.c
@@ -379,11 +379,11 @@ start_thread (void *arg)
   /* Mark the memory of the stack as usable to the kernel.  We free
      everything except for the space used for the TCB itself.  */
   size_t pagesize_m1 = __getpagesize () - 1;
-#ifdef _STACK_GROWS_DOWN
   char *sp = CURRENT_STACK_FRAME;
+#ifdef _STACK_GROWS_DOWN
   size_t freesize = (sp - (char *) pd->stackblock) & ~pagesize_m1;
 #else
-# error "to do"
+  size_t freesize = ((char *) pd->stackblock - sp) & ~pagesize_m1;
 #endif
   assert (freesize < pd->stackblock_size);
   if (freesize > PTHREAD_STACK_MIN)
-- 
1.7.3.4



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