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guarantee that the stack is aligned to 16 byte

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This commit is contained in:
Stefan Lankes 2015-07-24 11:45:25 +02:00
parent 7757511e62
commit 42c1c06632
1 changed files with 4 additions and 3 deletions
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7
hermit/arch/x86/kernel/tasks.c
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@ -44,9 +44,10 @@ size_t* get_current_stack(void)
{
uint32_t core_id = CORE_ID;
task_t* curr_task = per_core(current_task);
size_t stptr = ((size_t) curr_task->stack + KERNEL_STACK_SIZE - 0x10) & ~0xF;
set_per_core(kernel_stack, curr_task->stack + KERNEL_STACK_SIZE - 0x10);
task_state_segments[core_id].rsp0 = (size_t) curr_task->stack + KERNEL_STACK_SIZE - 0x10;
set_per_core(kernel_stack, stptr);
task_state_segments[core_id].rsp0 = stptr;
// use new page table
write_cr3(curr_task->page_map);
@ -72,7 +73,7 @@ int create_default_frame(task_t* task, entry_point_t ep, void* arg)
* and not for HW-task-switching is setting up a stack and not a TSS.
* This is the stack which will be activated and popped off for iret later.
*/
stack = (size_t*) (task->stack + KERNEL_STACK_SIZE - 16); // => stack is 16byte aligned
stack = (size_t*) (((size_t) task->stack + KERNEL_STACK_SIZE - 0x10) & ~0xF); // => stack is 16byte aligned
/* Only marker for debugging purposes, ... */
*stack-- = 0xDEADBEEF;