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
|
#ifndef _I386_KEXEC_H
#define _I386_KEXEC_H
#include <asm/fixmap.h>
#include <asm/ptrace.h>
#include <asm/string.h>
/*
* KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
* I.e. Maximum page that is mapped directly into kernel memory,
* and kmap is not required.
*
* Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct
* calculation for the amount of memory directly mappable into the
* kernel memory space.
*/
/* Maximum physical address we can use pages from */
#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
/* Maximum address we can reach in physical address mode */
#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
/* Maximum address we can use for the control code buffer */
#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
#define KEXEC_CONTROL_CODE_SIZE 4096
/* The native architecture */
#define KEXEC_ARCH KEXEC_ARCH_386
#define MAX_NOTE_BYTES 1024
/* CPU does not save ss and esp on stack if execution is already
* running in kernel mode at the time of NMI occurrence. This code
* fixes it.
*/
static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
struct pt_regs *oldregs)
{
memcpy(newregs, oldregs, sizeof(*newregs));
newregs->esp = (unsigned long)&(oldregs->esp);
__asm__ __volatile__(
"xorl %%eax, %%eax\n\t"
"movw %%ss, %%ax\n\t"
:"=a"(newregs->xss));
}
/*
* This function is responsible for capturing register states if coming
* via panic otherwise just fix up the ss and esp if coming via kernel
* mode exception.
*/
static inline void crash_setup_regs(struct pt_regs *newregs,
struct pt_regs *oldregs)
{
if (oldregs)
crash_fixup_ss_esp(newregs, oldregs);
else {
__asm__ __volatile__("movl %%ebx,%0" : "=m"(newregs->ebx));
__asm__ __volatile__("movl %%ecx,%0" : "=m"(newregs->ecx));
__asm__ __volatile__("movl %%edx,%0" : "=m"(newregs->edx));
__asm__ __volatile__("movl %%esi,%0" : "=m"(newregs->esi));
__asm__ __volatile__("movl %%edi,%0" : "=m"(newregs->edi));
__asm__ __volatile__("movl %%ebp,%0" : "=m"(newregs->ebp));
__asm__ __volatile__("movl %%eax,%0" : "=m"(newregs->eax));
__asm__ __volatile__("movl %%esp,%0" : "=m"(newregs->esp));
__asm__ __volatile__("movw %%ss, %%ax;" :"=a"(newregs->xss));
__asm__ __volatile__("movw %%cs, %%ax;" :"=a"(newregs->xcs));
__asm__ __volatile__("movw %%ds, %%ax;" :"=a"(newregs->xds));
__asm__ __volatile__("movw %%es, %%ax;" :"=a"(newregs->xes));
__asm__ __volatile__("pushfl; popl %0" :"=m"(newregs->eflags));
newregs->eip = (unsigned long)current_text_addr();
}
}
#endif /* _I386_KEXEC_H */
|
