Commit | Line | Data |
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da7c5cc6 KM |
1 | /* |
2 | * Copyright (c) 1982 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | * | |
6 | * @(#)sys_process.c 6.4 (Berkeley) %G% | |
7 | */ | |
961945a8 SL |
8 | |
9 | #include "../machine/reg.h" | |
10 | #include "../machine/psl.h" | |
11 | #include "../machine/pte.h" | |
9ce4de2d | 12 | |
94368568 JB |
13 | #include "param.h" |
14 | #include "systm.h" | |
15 | #include "dir.h" | |
16 | #include "user.h" | |
17 | #include "proc.h" | |
18 | #include "inode.h" | |
19 | #include "text.h" | |
20 | #include "seg.h" | |
21 | #include "vm.h" | |
22 | #include "buf.h" | |
23 | #include "acct.h" | |
9ce4de2d | 24 | |
4147b3f6 BJ |
25 | /* |
26 | * Priority for tracing | |
27 | */ | |
28 | #define IPCPRI PZERO | |
29 | ||
30 | /* | |
31 | * Tracing variables. | |
32 | * Used to pass trace command from | |
33 | * parent to child being traced. | |
34 | * This data base cannot be | |
35 | * shared and is locked | |
36 | * per user. | |
37 | */ | |
38 | struct { | |
39 | int ip_lock; | |
40 | int ip_req; | |
41 | int *ip_addr; | |
42 | int ip_data; | |
43 | } ipc; | |
44 | ||
45 | /* | |
46 | * sys-trace system call. | |
47 | */ | |
48 | ptrace() | |
49 | { | |
50 | register struct proc *p; | |
51 | register struct a { | |
52 | int req; | |
53 | int pid; | |
54 | int *addr; | |
55 | int data; | |
56 | } *uap; | |
57 | ||
58 | uap = (struct a *)u.u_ap; | |
59 | if (uap->req <= 0) { | |
60 | u.u_procp->p_flag |= STRC; | |
61 | return; | |
62 | } | |
63 | p = pfind(uap->pid); | |
f05cf4fe SL |
64 | if (p == 0 || p->p_stat != SSTOP || p->p_ppid != u.u_procp->p_pid || |
65 | !(p->p_flag & STRC)) { | |
4147b3f6 BJ |
66 | u.u_error = ESRCH; |
67 | return; | |
68 | } | |
69 | while (ipc.ip_lock) | |
70 | sleep((caddr_t)&ipc, IPCPRI); | |
71 | ipc.ip_lock = p->p_pid; | |
72 | ipc.ip_data = uap->data; | |
73 | ipc.ip_addr = uap->addr; | |
74 | ipc.ip_req = uap->req; | |
75 | p->p_flag &= ~SWTED; | |
76 | while (ipc.ip_req > 0) { | |
77 | if (p->p_stat==SSTOP) | |
78 | setrun(p); | |
79 | sleep((caddr_t)&ipc, IPCPRI); | |
80 | } | |
81 | u.u_r.r_val1 = ipc.ip_data; | |
82 | if (ipc.ip_req < 0) | |
83 | u.u_error = EIO; | |
84 | ipc.ip_lock = 0; | |
85 | wakeup((caddr_t)&ipc); | |
86 | } | |
87 | ||
b4e32d36 | 88 | #ifdef vax |
883d0f83 | 89 | #define NIPCREG 16 |
883d0f83 | 90 | int ipcreg[NIPCREG] = |
883d0f83 BJ |
91 | {R0,R1,R2,R3,R4,R5,R6,R7,R8,R9,R10,R11,AP,FP,SP,PC}; |
92 | #endif | |
883d0f83 | 93 | |
fc0890b1 | 94 | #define PHYSOFF(p, o) \ |
883d0f83 BJ |
95 | ((physadr)(p)+((o)/sizeof(((physadr)0)->r[0]))) |
96 | ||
4147b3f6 BJ |
97 | /* |
98 | * Code that the child process | |
99 | * executes to implement the command | |
100 | * of the parent process in tracing. | |
101 | */ | |
102 | procxmt() | |
103 | { | |
104 | register int i; | |
105 | register *p; | |
106 | register struct text *xp; | |
107 | ||
108 | if (ipc.ip_lock != u.u_procp->p_pid) | |
109 | return (0); | |
110 | u.u_procp->p_slptime = 0; | |
111 | i = ipc.ip_req; | |
112 | ipc.ip_req = 0; | |
113 | switch (i) { | |
114 | ||
115 | /* read user I */ | |
116 | case 1: | |
117 | if (!useracc((caddr_t)ipc.ip_addr, 4, B_READ)) | |
118 | goto error; | |
119 | ipc.ip_data = fuiword((caddr_t)ipc.ip_addr); | |
120 | break; | |
121 | ||
122 | /* read user D */ | |
123 | case 2: | |
124 | if (!useracc((caddr_t)ipc.ip_addr, 4, B_READ)) | |
125 | goto error; | |
126 | ipc.ip_data = fuword((caddr_t)ipc.ip_addr); | |
127 | break; | |
128 | ||
129 | /* read u */ | |
130 | case 3: | |
131 | i = (int)ipc.ip_addr; | |
132 | if (i<0 || i >= ctob(UPAGES)) | |
133 | goto error; | |
883d0f83 | 134 | ipc.ip_data = *(int *)PHYSOFF(&u, i); |
4147b3f6 BJ |
135 | break; |
136 | ||
137 | /* write user I */ | |
138 | /* Must set up to allow writing */ | |
139 | case 4: | |
140 | /* | |
141 | * If text, must assure exclusive use | |
142 | */ | |
143 | if (xp = u.u_procp->p_textp) { | |
144 | if (xp->x_count!=1 || xp->x_iptr->i_mode&ISVTX) | |
145 | goto error; | |
ce08d752 | 146 | xp->x_iptr->i_flag |= IXMOD; /* XXX */ |
4147b3f6 BJ |
147 | } |
148 | i = -1; | |
883d0f83 BJ |
149 | if ((i = suiword((caddr_t)ipc.ip_addr, ipc.ip_data)) < 0) { |
150 | if (chgprot((caddr_t)ipc.ip_addr, RW) && | |
151 | chgprot((caddr_t)ipc.ip_addr+(sizeof(int)-1), RW)) | |
152 | i = suiword((caddr_t)ipc.ip_addr, ipc.ip_data); | |
153 | (void) chgprot((caddr_t)ipc.ip_addr, RO); | |
154 | (void) chgprot((caddr_t)ipc.ip_addr+(sizeof(int)-1), RO); | |
155 | } | |
4147b3f6 BJ |
156 | if (i < 0) |
157 | goto error; | |
158 | if (xp) | |
159 | xp->x_flag |= XWRIT; | |
160 | break; | |
161 | ||
162 | /* write user D */ | |
163 | case 5: | |
164 | if (suword((caddr_t)ipc.ip_addr, 0) < 0) | |
165 | goto error; | |
166 | (void) suword((caddr_t)ipc.ip_addr, ipc.ip_data); | |
167 | break; | |
168 | ||
169 | /* write u */ | |
170 | case 6: | |
171 | i = (int)ipc.ip_addr; | |
883d0f83 BJ |
172 | p = (int *)PHYSOFF(&u, i); |
173 | for (i=0; i<NIPCREG; i++) | |
4147b3f6 BJ |
174 | if (p == &u.u_ar0[ipcreg[i]]) |
175 | goto ok; | |
176 | if (p == &u.u_ar0[PS]) { | |
883d0f83 | 177 | ipc.ip_data |= PSL_USERSET; |
4147b3f6 BJ |
178 | ipc.ip_data &= ~PSL_USERCLR; |
179 | goto ok; | |
180 | } | |
181 | goto error; | |
182 | ||
183 | ok: | |
184 | *p = ipc.ip_data; | |
185 | break; | |
186 | ||
187 | /* set signal and continue */ | |
188 | /* one version causes a trace-trap */ | |
189 | case 9: | |
190 | case 7: | |
191 | if ((int)ipc.ip_addr != 1) | |
192 | u.u_ar0[PC] = (int)ipc.ip_addr; | |
193 | if ((unsigned)ipc.ip_data > NSIG) | |
194 | goto error; | |
195 | u.u_procp->p_cursig = ipc.ip_data; /* see issig */ | |
961945a8 | 196 | if (i == 9) |
4147b3f6 BJ |
197 | u.u_ar0[PS] |= PSL_T; |
198 | wakeup((caddr_t)&ipc); | |
199 | return (1); | |
200 | ||
201 | /* force exit */ | |
202 | case 8: | |
203 | wakeup((caddr_t)&ipc); | |
204 | exit(u.u_procp->p_cursig); | |
205 | ||
206 | default: | |
207 | error: | |
208 | ipc.ip_req = -1; | |
209 | } | |
210 | wakeup((caddr_t)&ipc); | |
211 | return (0); | |
212 | } |