process.c (77bf4400319db9d2a8af6b00c2be6faa0f3d07cb) process.c (ba180fd437156f7fd8cfb2fdd021d949eeef08d6)
1/*
2 * Copyright (C) 2002 Jeff Dike (jdike@addtoit.com)
1/*
2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
3 * Licensed under the GPL
4 */
5
6#include <unistd.h>
7#include <stdio.h>
6#include <stdio.h>
7#include <unistd.h>
8#include <errno.h>
9#include <signal.h>
10#include <sys/mman.h>
8#include <errno.h>
9#include <signal.h>
10#include <sys/mman.h>
11#include <sys/ptrace.h>
11#include <sys/wait.h>
12#include <sys/wait.h>
12#include <sys/mman.h>
13#include <sys/syscall.h>
14#include "ptrace_user.h"
13#include <asm/unistd.h>
14#include "init.h"
15#include "kern_constants.h"
16#include "longjmp.h"
15#include "os.h"
17#include "os.h"
16#include "user.h"
17#include "process.h"
18#include "process.h"
18#include "irq_user.h"
19#include "kern_util.h"
20#include "longjmp.h"
21#include "skas_ptrace.h"
19#include "skas_ptrace.h"
22#include "kern_constants.h"
23#include "uml-config.h"
24#include "init.h"
20#include "user.h"
25
26#define ARBITRARY_ADDR -1
27#define FAILURE_PID -1
28
29#define STAT_PATH_LEN sizeof("/proc/#######/stat\0")
30#define COMM_SCANF "%*[^)])"
31
32unsigned long os_process_pc(int pid)
33{
34 char proc_stat[STAT_PATH_LEN], buf[256];
35 unsigned long pc;
36 int fd, err;
37
38 sprintf(proc_stat, "/proc/%d/stat", pid);
39 fd = os_open_file(proc_stat, of_read(OPENFLAGS()), 0);
21
22#define ARBITRARY_ADDR -1
23#define FAILURE_PID -1
24
25#define STAT_PATH_LEN sizeof("/proc/#######/stat\0")
26#define COMM_SCANF "%*[^)])"
27
28unsigned long os_process_pc(int pid)
29{
30 char proc_stat[STAT_PATH_LEN], buf[256];
31 unsigned long pc;
32 int fd, err;
33
34 sprintf(proc_stat, "/proc/%d/stat", pid);
35 fd = os_open_file(proc_stat, of_read(OPENFLAGS()), 0);
40 if(fd < 0){
41 printk("os_process_pc - couldn't open '%s', err = %d\n",
42 proc_stat, -fd);
36 if (fd < 0) {
37 printk(UM_KERN_ERR "os_process_pc - couldn't open '%s', "
38 "err = %d\n", proc_stat, -fd);
43 return ARBITRARY_ADDR;
44 }
45 CATCH_EINTR(err = read(fd, buf, sizeof(buf)));
39 return ARBITRARY_ADDR;
40 }
41 CATCH_EINTR(err = read(fd, buf, sizeof(buf)));
46 if(err < 0){
47 printk("os_process_pc - couldn't read '%s', err = %d\n",
48 proc_stat, errno);
42 if (err < 0) {
43 printk(UM_KERN_ERR "os_process_pc - couldn't read '%s', "
44 "err = %d\n", proc_stat, errno);
49 os_close_file(fd);
50 return ARBITRARY_ADDR;
51 }
52 os_close_file(fd);
53 pc = ARBITRARY_ADDR;
45 os_close_file(fd);
46 return ARBITRARY_ADDR;
47 }
48 os_close_file(fd);
49 pc = ARBITRARY_ADDR;
54 if(sscanf(buf, "%*d " COMM_SCANF " %*c %*d %*d %*d %*d %*d %*d %*d "
50 if (sscanf(buf, "%*d " COMM_SCANF " %*c %*d %*d %*d %*d %*d %*d %*d "
55 "%*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d "
51 "%*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d "
56 "%*d %*d %*d %*d %*d %lu", &pc) != 1){
57 printk("os_process_pc - couldn't find pc in '%s'\n", buf);
52 "%*d %*d %*d %*d %*d %lu", &pc) != 1) {
53 printk(UM_KERN_ERR "os_process_pc - couldn't find pc in '%s'\n",
54 buf);
58 }
59 return pc;
60}
61
62int os_process_parent(int pid)
63{
64 char stat[STAT_PATH_LEN];
65 char data[256];
66 int parent, n, fd;
67
55 }
56 return pc;
57}
58
59int os_process_parent(int pid)
60{
61 char stat[STAT_PATH_LEN];
62 char data[256];
63 int parent, n, fd;
64
68 if(pid == -1)
65 if (pid == -1)
69 return -1;
70
71 snprintf(stat, sizeof(stat), "/proc/%d/stat", pid);
72 fd = os_open_file(stat, of_read(OPENFLAGS()), 0);
66 return -1;
67
68 snprintf(stat, sizeof(stat), "/proc/%d/stat", pid);
69 fd = os_open_file(stat, of_read(OPENFLAGS()), 0);
73 if(fd < 0){
74 printk("Couldn't open '%s', err = %d\n", stat, -fd);
70 if (fd < 0) {
71 printk(UM_KERN_ERR "Couldn't open '%s', err = %d\n", stat, -fd);
75 return FAILURE_PID;
76 }
77
78 CATCH_EINTR(n = read(fd, data, sizeof(data)));
79 os_close_file(fd);
80
72 return FAILURE_PID;
73 }
74
75 CATCH_EINTR(n = read(fd, data, sizeof(data)));
76 os_close_file(fd);
77
81 if(n < 0){
82 printk("Couldn't read '%s', err = %d\n", stat, errno);
78 if (n < 0) {
79 printk(UM_KERN_ERR "Couldn't read '%s', err = %d\n", stat,
80 errno);
83 return FAILURE_PID;
84 }
85
86 parent = FAILURE_PID;
87 n = sscanf(data, "%*d " COMM_SCANF " %*c %d", &parent);
81 return FAILURE_PID;
82 }
83
84 parent = FAILURE_PID;
85 n = sscanf(data, "%*d " COMM_SCANF " %*c %d", &parent);
88 if(n != 1)
89 printk("Failed to scan '%s'\n", data);
86 if (n != 1)
87 printk(UM_KERN_ERR "Failed to scan '%s'\n", data);
90
91 return parent;
92}
93
94void os_stop_process(int pid)
95{
96 kill(pid, SIGSTOP);
97}
98
99void os_kill_process(int pid, int reap_child)
100{
101 kill(pid, SIGKILL);
88
89 return parent;
90}
91
92void os_stop_process(int pid)
93{
94 kill(pid, SIGSTOP);
95}
96
97void os_kill_process(int pid, int reap_child)
98{
99 kill(pid, SIGKILL);
102 if(reap_child)
100 if (reap_child)
103 CATCH_EINTR(waitpid(pid, NULL, 0));
101 CATCH_EINTR(waitpid(pid, NULL, 0));
104
105}
106
107/* This is here uniquely to have access to the userspace errno, i.e. the one
108 * used by ptrace in case of error.
109 */
110
111long os_ptrace_ldt(long pid, long addr, long data)
112{

--- 11 unchanged lines hidden (view full) ---

124 * which it can't exit directly.
125 */
126
127void os_kill_ptraced_process(int pid, int reap_child)
128{
129 kill(pid, SIGKILL);
130 ptrace(PTRACE_KILL, pid);
131 ptrace(PTRACE_CONT, pid);
102}
103
104/* This is here uniquely to have access to the userspace errno, i.e. the one
105 * used by ptrace in case of error.
106 */
107
108long os_ptrace_ldt(long pid, long addr, long data)
109{

--- 11 unchanged lines hidden (view full) ---

121 * which it can't exit directly.
122 */
123
124void os_kill_ptraced_process(int pid, int reap_child)
125{
126 kill(pid, SIGKILL);
127 ptrace(PTRACE_KILL, pid);
128 ptrace(PTRACE_CONT, pid);
132 if(reap_child)
129 if (reap_child)
133 CATCH_EINTR(waitpid(pid, NULL, 0));
134}
135
136/* Don't use the glibc version, which caches the result in TLS. It misses some
137 * syscalls, and also breaks with clone(), which does not unshare the TLS.
138 */
139
140int os_getpid(void)

--- 7 unchanged lines hidden (view full) ---

148}
149
150int os_map_memory(void *virt, int fd, unsigned long long off, unsigned long len,
151 int r, int w, int x)
152{
153 void *loc;
154 int prot;
155
130 CATCH_EINTR(waitpid(pid, NULL, 0));
131}
132
133/* Don't use the glibc version, which caches the result in TLS. It misses some
134 * syscalls, and also breaks with clone(), which does not unshare the TLS.
135 */
136
137int os_getpid(void)

--- 7 unchanged lines hidden (view full) ---

145}
146
147int os_map_memory(void *virt, int fd, unsigned long long off, unsigned long len,
148 int r, int w, int x)
149{
150 void *loc;
151 int prot;
152
156 prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
153 prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
157 (x ? PROT_EXEC : 0);
158
159 loc = mmap64((void *) virt, len, prot, MAP_SHARED | MAP_FIXED,
160 fd, off);
154 (x ? PROT_EXEC : 0);
155
156 loc = mmap64((void *) virt, len, prot, MAP_SHARED | MAP_FIXED,
157 fd, off);
161 if(loc == MAP_FAILED)
158 if (loc == MAP_FAILED)
162 return -errno;
163 return 0;
164}
165
166int os_protect_memory(void *addr, unsigned long len, int r, int w, int x)
167{
159 return -errno;
160 return 0;
161}
162
163int os_protect_memory(void *addr, unsigned long len, int r, int w, int x)
164{
168 int prot = ((r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
165 int prot = ((r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
169 (x ? PROT_EXEC : 0));
170
166 (x ? PROT_EXEC : 0));
167
171 if(mprotect(addr, len, prot) < 0)
168 if (mprotect(addr, len, prot) < 0)
172 return -errno;
169 return -errno;
173 return 0;
170
171 return 0;
174}
175
176int os_unmap_memory(void *addr, int len)
177{
172}
173
174int os_unmap_memory(void *addr, int len)
175{
178 int err;
176 int err;
179
177
180 err = munmap(addr, len);
181 if(err < 0)
178 err = munmap(addr, len);
179 if (err < 0)
182 return -errno;
180 return -errno;
183 return 0;
181 return 0;
184}
185
186#ifndef MADV_REMOVE
187#define MADV_REMOVE KERNEL_MADV_REMOVE
188#endif
189
190int os_drop_memory(void *addr, int length)
191{
192 int err;
193
194 err = madvise(addr, length, MADV_REMOVE);
182}
183
184#ifndef MADV_REMOVE
185#define MADV_REMOVE KERNEL_MADV_REMOVE
186#endif
187
188int os_drop_memory(void *addr, int length)
189{
190 int err;
191
192 err = madvise(addr, length, MADV_REMOVE);
195 if(err < 0)
193 if (err < 0)
196 err = -errno;
197 return err;
198}
199
200int __init can_drop_memory(void)
201{
202 void *addr;
203 int fd, ok = 0;
204
194 err = -errno;
195 return err;
196}
197
198int __init can_drop_memory(void)
199{
200 void *addr;
201 int fd, ok = 0;
202
205 printk("Checking host MADV_REMOVE support...");
203 printk(UM_KERN_INFO "Checking host MADV_REMOVE support...");
206 fd = create_mem_file(UM_KERN_PAGE_SIZE);
204 fd = create_mem_file(UM_KERN_PAGE_SIZE);
207 if(fd < 0){
208 printk("Creating test memory file failed, err = %d\n", -fd);
205 if (fd < 0) {
206 printk(UM_KERN_ERR "Creating test memory file failed, "
207 "err = %d\n", -fd);
209 goto out;
210 }
211
212 addr = mmap64(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
213 MAP_SHARED, fd, 0);
208 goto out;
209 }
210
211 addr = mmap64(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
212 MAP_SHARED, fd, 0);
214 if(addr == MAP_FAILED){
215 printk("Mapping test memory file failed, err = %d\n", -errno);
213 if (addr == MAP_FAILED) {
214 printk(UM_KERN_ERR "Mapping test memory file failed, "
215 "err = %d\n", -errno);
216 goto out_close;
217 }
218
216 goto out_close;
217 }
218
219 if(madvise(addr, UM_KERN_PAGE_SIZE, MADV_REMOVE) != 0){
220 printk("MADV_REMOVE failed, err = %d\n", -errno);
219 if (madvise(addr, UM_KERN_PAGE_SIZE, MADV_REMOVE) != 0) {
220 printk(UM_KERN_ERR "MADV_REMOVE failed, err = %d\n", -errno);
221 goto out_unmap;
222 }
223
224 printk("OK\n");
225 ok = 1;
226
227out_unmap:
228 munmap(addr, UM_KERN_PAGE_SIZE);

--- 22 unchanged lines hidden (view full) ---

251
252int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr)
253{
254 jmp_buf buf;
255 int n;
256
257 *jmp_ptr = &buf;
258 n = UML_SETJMP(&buf);
221 goto out_unmap;
222 }
223
224 printk("OK\n");
225 ok = 1;
226
227out_unmap:
228 munmap(addr, UM_KERN_PAGE_SIZE);

--- 22 unchanged lines hidden (view full) ---

251
252int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr)
253{
254 jmp_buf buf;
255 int n;
256
257 *jmp_ptr = &buf;
258 n = UML_SETJMP(&buf);
259 if(n != 0)
259 if (n != 0)
260 return n;
261 (*fn)(arg);
262 return 0;
263}
260 return n;
261 (*fn)(arg);
262 return 0;
263}