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
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
* include/asm-alpha/processor.h
*
* Copyright (C) 1994 Linus Torvalds
*/
#ifndef __ASM_ALPHA_PROCESSOR_H
#define __ASM_ALPHA_PROCESSOR_H
/*
* We have a 42-bit user address space: 4TB user VM...
*/
#define TASK_SIZE (0x40000000000UL)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
/*
* Bus types
*/
#define EISA_bus 1
#define EISA_bus__is_a_macro /* for versions in ksyms.c */
#define MCA_bus 0
#define MCA_bus__is_a_macro /* for versions in ksyms.c */
struct thread_struct {
/* the fields below are used by PALcode and must match struct pcb: */
unsigned long ksp;
unsigned long usp;
unsigned long ptbr;
unsigned int pcc;
unsigned int asn;
unsigned long unique;
/*
* bit 0: floating point enable
* bit 62: performance monitor enable
*/
unsigned long pal_flags;
unsigned long res1, res2;
/* the fields below are Linux-specific: */
/* bit 1..5: IEEE_TRAP_ENABLE bits (see fpu.h) */
/* bit 6..8: UAC bits (see sysinfo.h) */
unsigned long flags;
/* perform syscall argument validation (get/set_fs) */
unsigned long fs;
};
#define INIT_MMAP { &init_mm, 0xfffffc0000000000, 0xfffffc0010000000, \
PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC }
#define INIT_TSS { \
0, 0, 0, \
0, 0, 0, \
0, 0, 0, \
0, \
0 \
}
#include <asm/ptrace.h>
/*
* Return saved PC of a blocked thread. This assumes the frame
* pointer is the 6th saved long on the kernel stack and that the
* saved return address is the first long in the frame. This all
* holds provided the thread blocked through a call to schedule() ($15
* is the frame pointer in schedule() and $15 is saved at offset 48 by
* entry.S:do_switch_stack).
*/
extern inline unsigned long thread_saved_pc(struct thread_struct *t)
{
unsigned long fp;
fp = ((unsigned long*)t->ksp)[6];
return *(unsigned long*)fp;
}
/*
* Do necessary setup to start up a newly executed thread.
*/
extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/* Allocation and freeing of basic task resources. */
#define alloc_task_struct() kmalloc(sizeof(struct task_struct), GFP_KERNEL)
#define alloc_kernel_stack(p) __get_free_page(GFP_KERNEL)
#define free_task_struct(p) kfree(p)
#define free_kernel_stack(page) free_page((page))
/*
* Return_address is a replacement for __builtin_return_address(count)
* which on certain architectures cannot reasonably be implemented in GCC
* (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
* Note that __builtin_return_address(x>=1) is forbidden because the GCC
* aborts compilation on some CPUs. It's simply not possible to unwind
* some CPU's stackframes.
*/
#define return_address() __builtin_return_address(0)
#endif /* __ASM_ALPHA_PROCESSOR_H */
|
