Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
0880b18e | 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
da7c5cc6 KM |
3 | * All rights reserved. The Berkeley software License Agreement |
4 | * specifies the terms and conditions for redistribution. | |
5 | * | |
ff32eb64 | 6 | * @(#)sys_process.c 7.3 (Berkeley) %G% |
da7c5cc6 | 7 | */ |
961945a8 | 8 | |
ff32eb64 | 9 | #define IPCREG |
961945a8 SL |
10 | #include "../machine/reg.h" |
11 | #include "../machine/psl.h" | |
12 | #include "../machine/pte.h" | |
9ce4de2d | 13 | |
94368568 JB |
14 | #include "param.h" |
15 | #include "systm.h" | |
16 | #include "dir.h" | |
17 | #include "user.h" | |
18 | #include "proc.h" | |
19 | #include "inode.h" | |
20 | #include "text.h" | |
21 | #include "seg.h" | |
22 | #include "vm.h" | |
23 | #include "buf.h" | |
24 | #include "acct.h" | |
01b0e233 | 25 | #include "ptrace.h" |
9ce4de2d | 26 | |
4147b3f6 BJ |
27 | /* |
28 | * Priority for tracing | |
29 | */ | |
30 | #define IPCPRI PZERO | |
31 | ||
32 | /* | |
33 | * Tracing variables. | |
34 | * Used to pass trace command from | |
35 | * parent to child being traced. | |
36 | * This data base cannot be | |
37 | * shared and is locked | |
38 | * per user. | |
39 | */ | |
40 | struct { | |
41 | int ip_lock; | |
42 | int ip_req; | |
43 | int *ip_addr; | |
44 | int ip_data; | |
45 | } ipc; | |
46 | ||
47 | /* | |
48 | * sys-trace system call. | |
49 | */ | |
50 | ptrace() | |
51 | { | |
52 | register struct proc *p; | |
53 | register struct a { | |
54 | int req; | |
55 | int pid; | |
56 | int *addr; | |
57 | int data; | |
58 | } *uap; | |
59 | ||
60 | uap = (struct a *)u.u_ap; | |
61 | if (uap->req <= 0) { | |
62 | u.u_procp->p_flag |= STRC; | |
63 | return; | |
64 | } | |
65 | p = pfind(uap->pid); | |
f05cf4fe SL |
66 | if (p == 0 || p->p_stat != SSTOP || p->p_ppid != u.u_procp->p_pid || |
67 | !(p->p_flag & STRC)) { | |
4147b3f6 BJ |
68 | u.u_error = ESRCH; |
69 | return; | |
70 | } | |
71 | while (ipc.ip_lock) | |
72 | sleep((caddr_t)&ipc, IPCPRI); | |
73 | ipc.ip_lock = p->p_pid; | |
74 | ipc.ip_data = uap->data; | |
75 | ipc.ip_addr = uap->addr; | |
76 | ipc.ip_req = uap->req; | |
77 | p->p_flag &= ~SWTED; | |
78 | while (ipc.ip_req > 0) { | |
79 | if (p->p_stat==SSTOP) | |
80 | setrun(p); | |
81 | sleep((caddr_t)&ipc, IPCPRI); | |
82 | } | |
83 | u.u_r.r_val1 = ipc.ip_data; | |
84 | if (ipc.ip_req < 0) | |
85 | u.u_error = EIO; | |
86 | ipc.ip_lock = 0; | |
87 | wakeup((caddr_t)&ipc); | |
88 | } | |
89 | ||
fc0890b1 | 90 | #define PHYSOFF(p, o) \ |
883d0f83 BJ |
91 | ((physadr)(p)+((o)/sizeof(((physadr)0)->r[0]))) |
92 | ||
4147b3f6 BJ |
93 | /* |
94 | * Code that the child process | |
95 | * executes to implement the command | |
96 | * of the parent process in tracing. | |
97 | */ | |
98 | procxmt() | |
99 | { | |
100 | register int i; | |
101 | register *p; | |
102 | register struct text *xp; | |
103 | ||
104 | if (ipc.ip_lock != u.u_procp->p_pid) | |
105 | return (0); | |
106 | u.u_procp->p_slptime = 0; | |
107 | i = ipc.ip_req; | |
108 | ipc.ip_req = 0; | |
109 | switch (i) { | |
110 | ||
01b0e233 | 111 | case PT_READ_I: /* read the child's text space */ |
4147b3f6 BJ |
112 | if (!useracc((caddr_t)ipc.ip_addr, 4, B_READ)) |
113 | goto error; | |
114 | ipc.ip_data = fuiword((caddr_t)ipc.ip_addr); | |
115 | break; | |
116 | ||
01b0e233 | 117 | case PT_READ_D: /* read the child's data space */ |
4147b3f6 BJ |
118 | if (!useracc((caddr_t)ipc.ip_addr, 4, B_READ)) |
119 | goto error; | |
120 | ipc.ip_data = fuword((caddr_t)ipc.ip_addr); | |
121 | break; | |
122 | ||
01b0e233 | 123 | case PT_READ_U: /* read the child's u. */ |
4147b3f6 BJ |
124 | i = (int)ipc.ip_addr; |
125 | if (i<0 || i >= ctob(UPAGES)) | |
126 | goto error; | |
883d0f83 | 127 | ipc.ip_data = *(int *)PHYSOFF(&u, i); |
4147b3f6 BJ |
128 | break; |
129 | ||
01b0e233 | 130 | case PT_WRITE_I: /* write the child's text space */ |
4147b3f6 BJ |
131 | /* |
132 | * If text, must assure exclusive use | |
133 | */ | |
134 | if (xp = u.u_procp->p_textp) { | |
135 | if (xp->x_count!=1 || xp->x_iptr->i_mode&ISVTX) | |
136 | goto error; | |
cdb14d96 | 137 | xp->x_flag |= XTRC; |
4147b3f6 BJ |
138 | } |
139 | i = -1; | |
883d0f83 BJ |
140 | if ((i = suiword((caddr_t)ipc.ip_addr, ipc.ip_data)) < 0) { |
141 | if (chgprot((caddr_t)ipc.ip_addr, RW) && | |
142 | chgprot((caddr_t)ipc.ip_addr+(sizeof(int)-1), RW)) | |
143 | i = suiword((caddr_t)ipc.ip_addr, ipc.ip_data); | |
144 | (void) chgprot((caddr_t)ipc.ip_addr, RO); | |
145 | (void) chgprot((caddr_t)ipc.ip_addr+(sizeof(int)-1), RO); | |
146 | } | |
4147b3f6 BJ |
147 | if (i < 0) |
148 | goto error; | |
fb1db32c MK |
149 | #if defined(tahoe) |
150 | /* make sure the old value is not in cache */ | |
151 | ckeyrelease(u.u_procp->p_ckey); | |
152 | u.u_procp->p_ckey = getcodekey(); | |
153 | #endif | |
154 | if (xp) { | |
4147b3f6 | 155 | xp->x_flag |= XWRIT; |
fb1db32c MK |
156 | #if defined(tahoe) |
157 | xp->x_ckey = u.u_procp->p_ckey; | |
158 | #endif | |
159 | } | |
4147b3f6 BJ |
160 | break; |
161 | ||
01b0e233 | 162 | case PT_WRITE_D: /* write the child's data space */ |
4147b3f6 BJ |
163 | if (suword((caddr_t)ipc.ip_addr, 0) < 0) |
164 | goto error; | |
165 | (void) suword((caddr_t)ipc.ip_addr, ipc.ip_data); | |
166 | break; | |
167 | ||
01b0e233 | 168 | case PT_WRITE_U: /* write the child's u. */ |
4147b3f6 | 169 | i = (int)ipc.ip_addr; |
883d0f83 BJ |
170 | p = (int *)PHYSOFF(&u, i); |
171 | for (i=0; i<NIPCREG; i++) | |
4147b3f6 BJ |
172 | if (p == &u.u_ar0[ipcreg[i]]) |
173 | goto ok; | |
174 | if (p == &u.u_ar0[PS]) { | |
883d0f83 | 175 | ipc.ip_data |= PSL_USERSET; |
4147b3f6 BJ |
176 | ipc.ip_data &= ~PSL_USERCLR; |
177 | goto ok; | |
178 | } | |
179 | goto error; | |
180 | ||
181 | ok: | |
182 | *p = ipc.ip_data; | |
183 | break; | |
184 | ||
01b0e233 MK |
185 | case PT_STEP: /* single step the child */ |
186 | case PT_CONTINUE: /* continue the child */ | |
4147b3f6 BJ |
187 | if ((int)ipc.ip_addr != 1) |
188 | u.u_ar0[PC] = (int)ipc.ip_addr; | |
189 | if ((unsigned)ipc.ip_data > NSIG) | |
190 | goto error; | |
191 | u.u_procp->p_cursig = ipc.ip_data; /* see issig */ | |
01b0e233 | 192 | if (i == PT_STEP) |
4147b3f6 BJ |
193 | u.u_ar0[PS] |= PSL_T; |
194 | wakeup((caddr_t)&ipc); | |
195 | return (1); | |
196 | ||
01b0e233 | 197 | case PT_KILL: /* kill the child process */ |
4147b3f6 BJ |
198 | wakeup((caddr_t)&ipc); |
199 | exit(u.u_procp->p_cursig); | |
200 | ||
201 | default: | |
202 | error: | |
203 | ipc.ip_req = -1; | |
204 | } | |
205 | wakeup((caddr_t)&ipc); | |
206 | return (0); | |
207 | } |