/*
* Allocate the stack, and build the argument list.
*/
static void
build_args_and_stack(struct exec_info *boot_exec_info,
char **argv, char **envp)
{
vm_offset_t stack_base;
vm_size_t stack_size;
char * arg_ptr;
int arg_count, envc;
int arg_len;
char * arg_pos;
int arg_item_len;
char * string_pos;
char * zero = (char *)0;
int i;
#define STACK_SIZE (64*1024)
/*
* Calculate the size of the argument list.
*/
arg_len = 0;
arg_count = 0;
while (argv[arg_count] != 0) {
arg_ptr = argv[arg_count++];
arg_len += strlen(arg_ptr) + 1;
}
envc = 0;
if (envp != 0)
while (envp[envc] != 0)
arg_len += strlen (envp[envc++]) + 1;
/*
* Add space for:
* arg count
* pointers to arguments
* trailing 0 pointer
* pointers to environment variables
* trailing 0 pointer
* and align to integer boundary
*/
arg_len += (sizeof(integer_t)
+ (arg_count + 1 + envc + 1) * sizeof(char *));
arg_len = (arg_len + sizeof(integer_t) - 1) & ~(sizeof(integer_t)-1);
/*
* Allocate the stack.
*/
stack_size = round_page(STACK_SIZE);
stack_base = user_stack_low(stack_size);
(void) vm_allocate(current_task()->map,
&stack_base,
stack_size,
FALSE);
arg_pos = (char *)
set_user_regs(stack_base, stack_size, boot_exec_info, arg_len);
/*
* Start the strings after the arg-count and pointers
*/
string_pos = (arg_pos
+ sizeof(integer_t)
+ (arg_count + 1 + envc + 1) * sizeof(char *));
/*
* first the argument count
*/
(void) copyout(&arg_count,
arg_pos,
sizeof(integer_t));
arg_pos += sizeof(integer_t);
/*
* Then the strings and string pointers for each argument
*/
for (i = 0; i < arg_count; ++i) {
arg_ptr = argv[i];
arg_item_len = strlen(arg_ptr) + 1; /* include trailing 0 */
/* set string pointer */
(void) copyout(&string_pos,
arg_pos,
sizeof (char *));
arg_pos += sizeof(char *);
/* copy string */
(void) copyout(arg_ptr, string_pos, arg_item_len);
string_pos += arg_item_len;
}
/*
* Null terminator for argv.
*/
(void) copyout(&zero, arg_pos, sizeof(char *));
arg_pos += sizeof(char *);
/*
* Then the strings and string pointers for each environment variable
*/
for (i = 0; i < envc; ++i) {
arg_ptr = envp[i];
arg_item_len = strlen(arg_ptr) + 1; /* include trailing 0 */
/* set string pointer */
(void) copyout(&string_pos,
arg_pos,
sizeof (char *));
arg_pos += sizeof(char *);
/* copy string */
(void) copyout(arg_ptr, string_pos, arg_item_len);
string_pos += arg_item_len;
}
/*
* Null terminator for envp.
*/
(void) copyout(&zero, arg_pos, sizeof(char *));
}
void
static build_args_and_stack(struct exec_info *boot_exec_info, ...)
{
vm_offset_t stack_base;
vm_size_t stack_size;
va_list argv_ptr;
register
char * arg_ptr;
int arg_len;
int arg_count;
register
char * arg_pos;
int arg_item_len;
char * string_pos;
char * zero = (char *)0;
#define STACK_SIZE (64*1024)
/*
* Calculate the size of the argument list.
*/
va_start(argv_ptr, boot_exec_info);
arg_len = 0;
arg_count = 0;
for (;;) {
arg_ptr = va_arg(argv_ptr, char *);
if (arg_ptr == 0)
break;
arg_count++;
arg_len += strlen(arg_ptr) + 1;
}
va_end(argv_ptr);
/*
* Add space for:
* arg count
* pointers to arguments
* trailing 0 pointer
* dummy 0 pointer to environment variables
* and align to integer boundary
*/
arg_len += sizeof(integer_t)
+ (2 + arg_count) * sizeof(char *);
arg_len = (arg_len + sizeof(integer_t) - 1) & ~(sizeof(integer_t)-1);
/*
* Allocate the stack.
*/
stack_size = round_page(STACK_SIZE);
stack_base = user_stack_low(stack_size);
(void) vm_allocate(current_task()->map,
&stack_base,
stack_size,
FALSE);
arg_pos = (char *)
set_user_regs(stack_base, stack_size, boot_exec_info, arg_len);
/*
* Start the strings after the arg-count and pointers
*/
string_pos = arg_pos
+ sizeof(integer_t)
+ arg_count * sizeof(char *)
+ 2 * sizeof(char *);
/*
* first the argument count
*/
(void) copyout((char *)&arg_count,
arg_pos,
sizeof(integer_t));
arg_pos += sizeof(integer_t);
/*
* Then the strings and string pointers for each argument
*/
va_start(argv_ptr, boot_exec_info);
while (--arg_count >= 0) {
arg_ptr = va_arg(argv_ptr, char *);
arg_item_len = strlen(arg_ptr) + 1; /* include trailing 0 */
/* set string pointer */
(void) copyout((char *)&string_pos,
arg_pos,
sizeof (char *));
arg_pos += sizeof(char *);
/* copy string */
(void) copyout(arg_ptr, string_pos, arg_item_len);
string_pos += arg_item_len;
}
va_end(argv_ptr);
/*
* last, the trailing 0 argument and a null environment pointer.
*/
(void) copyout((char *)&zero, arg_pos, sizeof(char *));
arg_pos += sizeof(char *);
(void) copyout((char *)&zero, arg_pos, sizeof(char *));
}
