| 72 | ****************************************************************************/ |
| 73 | |
| 74 | FAR void *up_stack_frame(FAR struct tcb_s *tcb, size_t frame_size) |
| 75 | { |
| 76 | FAR void *ret; |
| 77 | |
| 78 | /* Align the frame_size */ |
| 79 | |
| 80 | frame_size = STACKFRAME_ALIGN_UP(frame_size); |
| 81 | |
| 82 | /* Is there already a stack allocated? Is it big enough? */ |
| 83 | |
| 84 | if (!tcb->stack_alloc_ptr || tcb->adj_stack_size <= frame_size) |
| 85 | { |
| 86 | return NULL; |
| 87 | } |
| 88 | |
| 89 | ret = tcb->stack_base_ptr; |
| 90 | memset(ret, 0, frame_size); |
| 91 | |
| 92 | /* Save the adjusted stack values in the struct tcb_s */ |
| 93 | |
| 94 | tcb->stack_base_ptr = (FAR uint8_t *)tcb->stack_base_ptr + frame_size; |
| 95 | tcb->adj_stack_size -= frame_size; |
| 96 | |
| 97 | /* And return the pointer to the allocated region */ |
| 98 | |
| 99 | return ret; |
| 100 | } |