1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
/*
* Mach Operating System
* Copyright (c) 1993-1989 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* i386-specific routines for loading a.out files.
*/
#include <mach.h>
#include <mach/machine/vm_param.h>
#include <mach/machine/eflags.h>
#include "mach-exec.h"
#include <file_io.h>
/*
* Machine-dependent portions of execve() for the i386.
*/
#define STACK_SIZE (64*1024)
char *set_regs(
mach_port_t user_task,
mach_port_t user_thread,
struct exec_info *info,
int arg_size)
{
vm_offset_t stack_start;
vm_offset_t stack_end;
struct i386_thread_state regs;
unsigned int reg_size;
/*
* Add space for 5 ints to arguments, for
* PS program. XXX
*/
arg_size += 5 * sizeof(int);
/*
* Allocate stack.
*/
stack_end = VM_MAX_ADDRESS;
stack_start = VM_MAX_ADDRESS - STACK_SIZE;
(void)vm_allocate(user_task,
&stack_start,
(vm_size_t)(stack_end - stack_start),
FALSE);
reg_size = i386_THREAD_STATE_COUNT;
(void)thread_get_state(user_thread,
i386_THREAD_STATE,
(thread_state_t)®s,
®_size);
regs.eip = info->entry;
regs.uesp = (int)((stack_end - arg_size) & ~(sizeof(int)-1));
/* regs.efl |= EFL_TF; trace flag*/
(void)thread_set_state(user_thread,
i386_THREAD_STATE,
(thread_state_t)®s,
reg_size);
return (char *)regs.uesp;
}
|
