1 /* (c) 2007,2008 Andrei Nigmatulin */
2
3 #include "fpm_config.h"
4
5 #include <mach/mach.h>
6 #include <mach/mach_vm.h>
7
8 #include <unistd.h>
9
10 #include "fpm_trace.h"
11 #include "fpm_process_ctl.h"
12 #include "fpm_unix.h"
13 #include "zlog.h"
14
15
16 static mach_port_name_t target;
17 static vm_offset_t target_page_base;
18 static vm_offset_t local_page;
19 static mach_msg_type_number_t local_size;
20
fpm_mach_vm_deallocate(void)21 static void fpm_mach_vm_deallocate(void)
22 {
23 if (local_page) {
24 mach_vm_deallocate(mach_task_self(), local_page, local_size);
25 target_page_base = 0;
26 local_page = 0;
27 local_size = 0;
28 }
29 }
30
fpm_mach_vm_read_page(vm_offset_t page)31 static int fpm_mach_vm_read_page(vm_offset_t page) /* {{{ */
32 {
33 kern_return_t kr;
34
35 kr = mach_vm_read(target, page, fpm_pagesize, &local_page, &local_size);
36 if (kr != KERN_SUCCESS) {
37 zlog(ZLOG_ERROR, "failed to read vm page: mach_vm_read(): %s (%d)", mach_error_string(kr), kr);
38 return -1;
39 }
40 return 0;
41 }
42 /* }}} */
43
fpm_trace_signal(pid_t pid)44 int fpm_trace_signal(pid_t pid) /* {{{ */
45 {
46 if (0 > fpm_pctl_kill(pid, FPM_PCTL_STOP)) {
47 zlog(ZLOG_SYSERROR, "failed to send SIGSTOP to %d", pid);
48 return -1;
49 }
50 return 0;
51 }
52 /* }}} */
53
fpm_trace_ready(pid_t pid)54 int fpm_trace_ready(pid_t pid) /* {{{ */
55 {
56 kern_return_t kr;
57
58 kr = task_for_pid(mach_task_self(), pid, &target);
59 if (kr != KERN_SUCCESS) {
60 char *msg = "";
61
62 if (kr == KERN_FAILURE) {
63 msg = " It seems that master process does not have enough privileges to trace processes.";
64 }
65 zlog(ZLOG_ERROR, "task_for_pid() failed: %s (%d)%s", mach_error_string(kr), kr, msg);
66 return -1;
67 }
68 return 0;
69 }
70 /* }}} */
71
fpm_trace_close(pid_t pid)72 int fpm_trace_close(pid_t pid) /* {{{ */
73 {
74 fpm_mach_vm_deallocate();
75 target = 0;
76 return 0;
77 }
78 /* }}} */
79
fpm_trace_get_long(long addr,long * data)80 int fpm_trace_get_long(long addr, long *data) /* {{{ */
81 {
82 size_t offset = ((uintptr_t) (addr) % fpm_pagesize);
83 vm_offset_t base = (uintptr_t) (addr) - offset;
84
85 if (base != target_page_base) {
86 fpm_mach_vm_deallocate();
87 if (0 > fpm_mach_vm_read_page(base)) {
88 return -1;
89 }
90 }
91 *data = * (long *) (local_page + offset);
92 return 0;
93 }
94 /* }}} */
95
