diff options
Diffstat (limited to 'nuttx/arch/sh/src/common/up_usestack.c')
| -rw-r--r-- | nuttx/arch/sh/src/common/up_usestack.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/nuttx/arch/sh/src/common/up_usestack.c b/nuttx/arch/sh/src/common/up_usestack.c index bcce3261c..e0f348045 100644 --- a/nuttx/arch/sh/src/common/up_usestack.c +++ b/nuttx/arch/sh/src/common/up_usestack.c @@ -107,18 +107,16 @@ int up_use_stack(struct tcb_s *tcb, void *stack, size_t stack_size) tcb->stack_alloc_ptr = stack; - /* The Arm7Tdmi uses a push-down stack: the stack grows - * toward loweraddresses in memory. The stack pointer - * register, points to the lowest, valid work address - * (the "top" of the stack). Items on the stack are - * referenced as positive word offsets from sp. + /* The SH family uses a push-down stack: the stack grows toward lower + * addresses in memory. The stack pointer register, points to the + * lowest, valid work address (the "top" of the stack). Items on the + * stack are referenced as positive word offsets from sp. */ top_of_stack = (uint32_t)tcb->stack_alloc_ptr + stack_size - 4; - /* The Arm7Tdmi stack must be aligned at word (4 byte) - * boundaries. If necessary top_of_stack must be rounded - * down to the next boundary + /* The SH stack must be aligned at word (4 byte) boundaries. If necessary + * top_of_stack must be rounded down to the next boundary */ top_of_stack &= ~3; |