| /* |
| * 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; |
| } |
