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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
|
#include <sys/ptrace.h>
#include <sys/wait.h>
#include "xc_private.h"
#include <time.h>
#define BSD_PAGE_MASK (PAGE_SIZE-1)
#define PG_FRAME (~((unsigned long)BSD_PAGE_MASK)
#define PDRSHIFT 22
#define PSL_T 0x00000100 /* trace enable bit */
#define VCPU 0 /* XXX */
/*
* long
* ptrace(enum __ptrace_request request, pid_t pid, void *addr, void *data);
*/
struct gdb_regs {
long ebx; /* 0 */
long ecx; /* 4 */
long edx; /* 8 */
long esi; /* 12 */
long edi; /* 16 */
long ebp; /* 20 */
long eax; /* 24 */
int xds; /* 28 */
int xes; /* 32 */
int xfs; /* 36 */
int xgs; /* 40 */
long orig_eax; /* 44 */
long eip; /* 48 */
int xcs; /* 52 */
long eflags; /* 56 */
long esp; /* 60 */
int xss; /* 64 */
};
#define printval(x) printf("%s = %lx\n", #x, (long)x);
#define SET_PT_REGS(pt, xc) \
{ \
pt.ebx = xc.ebx; \
pt.ecx = xc.ecx; \
pt.edx = xc.edx; \
pt.esi = xc.esi; \
pt.edi = xc.edi; \
pt.ebp = xc.ebp; \
pt.eax = xc.eax; \
pt.eip = xc.eip; \
pt.xcs = xc.cs; \
pt.eflags = xc.eflags; \
pt.esp = xc.esp; \
pt.xss = xc.ss; \
pt.xes = xc.es; \
pt.xds = xc.ds; \
pt.xfs = xc.fs; \
pt.xgs = xc.gs; \
}
#define SET_XC_REGS(pt, xc) \
{ \
xc.ebx = pt->ebx; \
xc.ecx = pt->ecx; \
xc.edx = pt->edx; \
xc.esi = pt->esi; \
xc.edi = pt->edi; \
xc.ebp = pt->ebp; \
xc.eax = pt->eax; \
xc.eip = pt->eip; \
xc.cs = pt->xcs; \
xc.eflags = pt->eflags; \
xc.esp = pt->esp; \
xc.ss = pt->xss; \
xc.es = pt->xes; \
xc.ds = pt->xds; \
xc.fs = pt->xfs; \
xc.gs = pt->xgs; \
}
#define vtopdi(va) ((va) >> PDRSHIFT)
#define vtopti(va) (((va) >> PAGE_SHIFT) & 0x3ff)
/* XXX application state */
static long nr_pages = 0;
static unsigned long *p2m_array = NULL;
static unsigned long *m2p_array = NULL;
static unsigned long pages_offset;
static unsigned long cr3[MAX_VIRT_CPUS];
static vcpu_guest_context_t ctxt[MAX_VIRT_CPUS];
/* --------------------- */
static unsigned long
map_mtop_offset(unsigned long ma)
{
return pages_offset + (m2p_array[ma >> PAGE_SHIFT] << PAGE_SHIFT);
}
static void *
map_domain_va(unsigned long domfd, int cpu, void * guest_va)
{
unsigned long pde, page;
unsigned long va = (unsigned long)guest_va;
void *v;
static unsigned long cr3_phys[MAX_VIRT_CPUS];
static unsigned long *cr3_virt[MAX_VIRT_CPUS];
static unsigned long pde_phys[MAX_VIRT_CPUS];
static unsigned long *pde_virt[MAX_VIRT_CPUS];
static unsigned long page_phys[MAX_VIRT_CPUS];
static unsigned long *page_virt[MAX_VIRT_CPUS];
if (cr3[cpu] != cr3_phys[cpu])
{
cr3_phys[cpu] = cr3[cpu];
if (cr3_virt[cpu])
munmap(cr3_virt[cpu], PAGE_SIZE);
v = mmap(
NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, domfd,
map_mtop_offset(cr3_phys[cpu]));
if (v == MAP_FAILED)
{
perror("mmap failed");
goto error_out;
}
cr3_virt[cpu] = v;
}
if ((pde = cr3_virt[cpu][vtopdi(va)]) == 0) /* logical address */
goto error_out;
if (ctxt[cpu].flags & VGCF_VMX_GUEST)
pde = p2m_array[pde >> PAGE_SHIFT] << PAGE_SHIFT;
if (pde != pde_phys[cpu])
{
pde_phys[cpu] = pde;
if (pde_virt[cpu])
munmap(pde_virt[cpu], PAGE_SIZE);
v = mmap(
NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, domfd,
map_mtop_offset(pde_phys[cpu]));
if (v == MAP_FAILED)
goto error_out;
pde_virt[cpu] = v;
}
if ((page = pde_virt[cpu][vtopti(va)]) == 0) /* logical address */
goto error_out;
if (ctxt[cpu].flags & VGCF_VMX_GUEST)
page = p2m_array[page >> PAGE_SHIFT] << PAGE_SHIFT;
if (page != page_phys[cpu])
{
page_phys[cpu] = page;
if (page_virt[cpu])
munmap(page_virt[cpu], PAGE_SIZE);
v = mmap(
NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, domfd,
map_mtop_offset(page_phys[cpu]));
if (v == MAP_FAILED) {
printf("cr3 %lx pde %lx page %lx pti %lx\n", cr3[cpu], pde, page, vtopti(va));
page_phys[cpu] = 0;
goto error_out;
}
page_virt[cpu] = v;
}
return (void *)(((unsigned long)page_virt[cpu]) | (va & BSD_PAGE_MASK));
error_out:
return 0;
}
int
xc_waitdomain_core(int domfd, int *status, int options)
{
int retval = -1;
int nr_vcpus;
int i;
xc_core_header_t header;
if (nr_pages == 0) {
if (read(domfd, &header, sizeof(header)) != sizeof(header))
return -1;
nr_pages = header.xch_nr_pages;
nr_vcpus = header.xch_nr_vcpus;
pages_offset = header.xch_pages_offset;
if (read(domfd, ctxt, sizeof(vcpu_guest_context_t)*nr_vcpus) !=
sizeof(vcpu_guest_context_t)*nr_vcpus)
return -1;
for (i = 0; i < nr_vcpus; i++) {
cr3[i] = ctxt[i].pt_base;
}
if ((p2m_array = malloc(nr_pages * sizeof(unsigned long))) == NULL) {
printf("Could not allocate p2m_array\n");
goto error_out;
}
if (read(domfd, p2m_array, sizeof(unsigned long)*nr_pages) !=
sizeof(unsigned long)*nr_pages)
return -1;
if ((m2p_array = malloc((1<<20) * sizeof(unsigned long))) == NULL) {
printf("Could not allocate m2p array\n");
goto error_out;
}
bzero(m2p_array, sizeof(unsigned long)* 1 << 20);
for (i = 0; i < nr_pages; i++) {
m2p_array[p2m_array[i]] = i;
}
}
retval = 0;
error_out:
return retval;
}
long
xc_ptrace_core(enum __ptrace_request request, u32 domfd, long eaddr, long edata)
{
int status = 0;
struct gdb_regs pt;
long retval = 0;
unsigned long *guest_va;
int cpu = VCPU;
void *addr = (char *)eaddr;
void *data = (char *)edata;
#if 0
printf("%20s %d, %p, %p \n", ptrace_names[request], domid, addr, data);
#endif
switch (request) {
case PTRACE_PEEKTEXT:
case PTRACE_PEEKDATA:
if ((guest_va = (unsigned long *)map_domain_va(domfd, cpu, addr)) == NULL) {
status = EFAULT;
goto error_out;
}
retval = *guest_va;
break;
case PTRACE_POKETEXT:
case PTRACE_POKEDATA:
if ((guest_va = (unsigned long *)map_domain_va(domfd, cpu, addr)) == NULL) {
status = EFAULT;
goto error_out;
}
*guest_va = (unsigned long)data;
break;
case PTRACE_GETREGS:
case PTRACE_GETFPREGS:
case PTRACE_GETFPXREGS:
if (request == PTRACE_GETREGS) {
SET_PT_REGS(pt, ctxt[cpu].user_regs);
memcpy(data, &pt, sizeof(struct gdb_regs));
} else if (request == PTRACE_GETFPREGS)
memcpy(data, &ctxt[cpu].fpu_ctxt, sizeof(ctxt[cpu].fpu_ctxt));
else /*if (request == PTRACE_GETFPXREGS)*/
memcpy(data, &ctxt[cpu].fpu_ctxt, sizeof(ctxt[cpu].fpu_ctxt));
break;
case PTRACE_ATTACH:
retval = 0;
break;
case PTRACE_SETREGS:
case PTRACE_SINGLESTEP:
case PTRACE_CONT:
case PTRACE_DETACH:
case PTRACE_SETFPREGS:
case PTRACE_SETFPXREGS:
case PTRACE_PEEKUSER:
case PTRACE_POKEUSER:
case PTRACE_SYSCALL:
case PTRACE_KILL:
#ifdef DEBUG
printf("unsupported xc_ptrace request %s\n", ptrace_names[request]);
#endif
status = ENOSYS;
break;
case PTRACE_TRACEME:
printf("PTRACE_TRACEME is an invalid request under Xen\n");
status = EINVAL;
}
if (status) {
errno = status;
retval = -1;
}
error_out:
return retval;
}
|
