blob: f30caf89eb9de3229e6f2ef1d430e6dc43f59740 [file] [log] [blame]
/*
* Copyright 2017, Data61, CSIRO (ABN 41 687 119 230)
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <autoconf.h>
#include <sel4utils/gen_config.h>
#include <sel4/types.h>
#include <sel4utils/thread.h>
#include <sel4utils/helpers.h>
#include <utils/zf_log.h>
#include <utils/stack.h>
#include <stdbool.h>
int sel4utils_arch_init_context(void *entry_point, void *stack_top, seL4_UserContext *context)
{
context->rsp = (seL4_Word) stack_top;
/* set edx to zero in case we are setting this when spawning a process as
* edx is the atexit parameter, which we currently do not use */
context->rdx = 0;
context->rip = (seL4_Word) entry_point;
return 0;
}
int sel4utils_arch_init_context_with_args(sel4utils_thread_entry_fn entry_point,
void *arg0, void *arg1, void *arg2,
bool local_stack, void *stack_top, seL4_UserContext *context,
vka_t *vka, vspace_t *local_vspace, vspace_t *remote_vspace)
{
if (!IS_ALIGNED((uintptr_t)stack_top, STACK_CALL_ALIGNMENT_BITS)) {
ZF_LOGE("Initial stack pointer must be %d byte aligned", STACK_CALL_ALIGNMENT);
return -1;
}
/* align the stack pointer so that when we are in the function pointed to
* by entry_point, the stack pointer is aligned as if a return address had
* been pushed onto the stack, which is what the compiler assumes */
uintptr_t stack_top_after_call = (uintptr_t) stack_top - sizeof(uintptr_t);
sel4utils_arch_init_context(entry_point, (void *)stack_top_after_call, context);
context->rdi = (seL4_Word) arg0;
context->rsi = (seL4_Word) arg1;
/* if we are setting args then we must not be spawning a process, therefore
* even though rdx was set to zero by sel4utils_arch_init_context we can
* safely put the arg in here */
context->rdx = (seL4_Word) arg2;
return 0;
}