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passing argc, argv and envp to main()

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This commit is contained in:
Balazs Gerofi
2012-05-10 22:07:23 +09:00
parent 97d4c85195
commit 7c85ac93e8
8 changed files with 228 additions and 15 deletions
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28
kernel/process.c
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@ -17,7 +17,7 @@
#define USER_STACK_NR_PAGES 4
#define KERNEL_STACK_NR_PAGES 4
#define KERNEL_STACK_NR_PAGES 8
extern long do_arch_prctl(unsigned long code, unsigned long address);
@ -137,8 +137,11 @@ int add_process_memory_range(struct process *process,
void init_process_stack(struct process *process)
void init_process_stack(struct process *process, int argc, char **argv,
int envc, char **env)
{
int s_ind = 0;
int arg_ind;
char *stack = aal_mc_alloc_pages(USER_STACK_NR_PAGES, 0);
unsigned long *p = (unsigned long *)(stack +
(USER_STACK_NR_PAGES * PAGE_SIZE));
@ -150,19 +153,24 @@ void init_process_stack(struct process *process)
USER_END,
virt_to_phys(stack), VR_STACK);
/* TODO: fill with actual value of argc, argv, envp */
p[-1] = 0; /* AT_NULL */
p[-2] = 0;
p[-3] = USER_END - sizeof(unsigned long) * 2;
p[-4] = 0; /* env: "" */
p[-5] = 0x41; /* argv(0): "a" */
p[-6] = 0; /* envp: NULL */
p[-7] = 0; /* argv[1] = NULL */
p[-8] = USER_END - sizeof(unsigned long) * 5; /* argv[0] = END - 16 */
p[-9] = 1; /* argc */
p[-4] = 0; /* envp terminating NULL */
s_ind = -5;
for (arg_ind = envc - 1; arg_ind > -1; --arg_ind) {
p[s_ind--] = (unsigned long)env[arg_ind];
}
p[s_ind--] = 0; /* argv terminating NULL */
for (arg_ind = argc - 1; arg_ind > -1; --arg_ind) {
p[s_ind--] = (unsigned long)argv[arg_ind];
}
/* argc */
p[s_ind] = argc;
aal_mc_modify_user_context(process->uctx, AAL_UCR_STACK_POINTER,
USER_END - sizeof(unsigned long) * 9);
USER_END + sizeof(unsigned long) * s_ind);
process->vm->region.stack_end = USER_END;
process->vm->region.stack_start = USER_END -
(USER_STACK_NR_PAGES * PAGE_SIZE);