1/* 2 * Copyright 2017, Data61 3 * Commonwealth Scientific and Industrial Research Organisation (CSIRO) 4 * ABN 41 687 119 230. 5 * 6 * This software may be distributed and modified according to the terms of 7 * the BSD 2-Clause license. Note that NO WARRANTY is provided. 8 * See "LICENSE_BSD2.txt" for details. 9 * 10 * @TAG(DATA61_BSD) 11 */ 12#include <autoconf.h> 13#include <sel4utils/gen_config.h> 14#include <sel4/types.h> 15#include <sel4utils/thread.h> 16#include <sel4utils/helpers.h> 17#include <utils/zf_log.h> 18#include <utils/stack.h> 19#include <stdbool.h> 20 21int sel4utils_arch_init_context(void *entry_point, void *stack_top, seL4_UserContext *context) 22{ 23 context->rsp = (seL4_Word) stack_top; 24 /* set edx to zero in case we are setting this when spawning a process as 25 * edx is the atexit parameter, which we currently do not use */ 26 context->rdx = 0; 27 context->rip = (seL4_Word) entry_point; 28 return 0; 29} 30 31int sel4utils_arch_init_context_with_args(sel4utils_thread_entry_fn entry_point, 32 void *arg0, void *arg1, void *arg2, 33 bool local_stack, void *stack_top, seL4_UserContext *context, 34 vka_t *vka, vspace_t *local_vspace, vspace_t *remote_vspace) 35{ 36 37 if (!IS_ALIGNED((uintptr_t)stack_top, STACK_CALL_ALIGNMENT_BITS)) { 38 ZF_LOGE("Initial stack pointer must be %d byte aligned", STACK_CALL_ALIGNMENT); 39 return -1; 40 } 41 42 /* align the stack pointer so that when we are in the function pointed to 43 * by entry_point, the stack pointer is aligned as if a return address had 44 * been pushed onto the stack, which is what the compiler assumes */ 45 uintptr_t stack_top_after_call = (uintptr_t) stack_top - sizeof(uintptr_t); 46 sel4utils_arch_init_context(entry_point, (void *)stack_top_after_call, context); 47 context->rdi = (seL4_Word) arg0; 48 context->rsi = (seL4_Word) arg1; 49 /* if we are setting args then we must not be spawning a process, therefore 50 * even though rdx was set to zero by sel4utils_arch_init_context we can 51 * safely put the arg in here */ 52 context->rdx = (seL4_Word) arg2; 53 return 0; 54} 55