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 | * | |
0880b18e | 6 | * @(#)sys_process.c 7.1 (Berkeley) %G% |
da7c5cc6 | 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" | |
01b0e233 | 24 | #include "ptrace.h" |
9ce4de2d | 25 | |
4147b3f6 BJ |
26 | /* |
27 | * Priority for tracing | |
28 | */ | |
29 | #define IPCPRI PZERO | |
30 | ||
31 | /* | |
32 | * Tracing variables. | |
33 | * Used to pass trace command from | |
34 | * parent to child being traced. | |
35 | * This data base cannot be | |
36 | * shared and is locked | |
37 | * per user. | |
38 | */ | |
39 | struct { | |
40 | int ip_lock; | |
41 | int ip_req; | |
42 | int *ip_addr; | |
43 | int ip_data; | |
44 | } ipc; | |
45 | ||
46 | /* | |
47 | * sys-trace system call. | |
48 | */ | |
49 | ptrace() | |
50 | { | |
51 | register struct proc *p; | |
52 | register struct a { | |
53 | int req; | |
54 | int pid; | |
55 | int *addr; | |
56 | int data; | |
57 | } *uap; | |
58 | ||
59 | uap = (struct a *)u.u_ap; | |
60 | if (uap->req <= 0) { | |
61 | u.u_procp->p_flag |= STRC; | |
62 | return; | |
63 | } | |
64 | p = pfind(uap->pid); | |
f05cf4fe SL |
65 | if (p == 0 || p->p_stat != SSTOP || p->p_ppid != u.u_procp->p_pid || |
66 | !(p->p_flag & STRC)) { | |
4147b3f6 BJ |
67 | u.u_error = ESRCH; |
68 | return; | |
69 | } | |
70 | while (ipc.ip_lock) | |
71 | sleep((caddr_t)&ipc, IPCPRI); | |
72 | ipc.ip_lock = p->p_pid; | |
73 | ipc.ip_data = uap->data; | |
74 | ipc.ip_addr = uap->addr; | |
75 | ipc.ip_req = uap->req; | |
76 | p->p_flag &= ~SWTED; | |
77 | while (ipc.ip_req > 0) { | |
78 | if (p->p_stat==SSTOP) | |
79 | setrun(p); | |
80 | sleep((caddr_t)&ipc, IPCPRI); | |
81 | } | |
82 | u.u_r.r_val1 = ipc.ip_data; | |
83 | if (ipc.ip_req < 0) | |
84 | u.u_error = EIO; | |
85 | ipc.ip_lock = 0; | |
86 | wakeup((caddr_t)&ipc); | |
87 | } | |
88 | ||
01b0e233 | 89 | #if defined(vax) |
883d0f83 | 90 | #define NIPCREG 16 |
883d0f83 | 91 | int ipcreg[NIPCREG] = |
883d0f83 BJ |
92 | {R0,R1,R2,R3,R4,R5,R6,R7,R8,R9,R10,R11,AP,FP,SP,PC}; |
93 | #endif | |
883d0f83 | 94 | |
fc0890b1 | 95 | #define PHYSOFF(p, o) \ |
883d0f83 BJ |
96 | ((physadr)(p)+((o)/sizeof(((physadr)0)->r[0]))) |
97 | ||
4147b3f6 BJ |
98 | /* |
99 | * Code that the child process | |
100 | * executes to implement the command | |
101 | * of the parent process in tracing. | |
102 | */ | |
103 | procxmt() | |
104 | { | |
105 | register int i; | |
106 | register *p; | |
107 | register struct text *xp; | |
108 | ||
109 | if (ipc.ip_lock != u.u_procp->p_pid) | |
110 | return (0); | |
111 | u.u_procp->p_slptime = 0; | |
112 | i = ipc.ip_req; | |
113 | ipc.ip_req = 0; | |
114 | switch (i) { | |
115 | ||
01b0e233 | 116 | case PT_READ_I: /* read the child's text space */ |
4147b3f6 BJ |
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 | ||
01b0e233 | 122 | case PT_READ_D: /* read the child's data space */ |
4147b3f6 BJ |
123 | if (!useracc((caddr_t)ipc.ip_addr, 4, B_READ)) |
124 | goto error; | |
125 | ipc.ip_data = fuword((caddr_t)ipc.ip_addr); | |
126 | break; | |
127 | ||
01b0e233 | 128 | case PT_READ_U: /* read the child's u. */ |
4147b3f6 BJ |
129 | i = (int)ipc.ip_addr; |
130 | if (i<0 || i >= ctob(UPAGES)) | |
131 | goto error; | |
883d0f83 | 132 | ipc.ip_data = *(int *)PHYSOFF(&u, i); |
4147b3f6 BJ |
133 | break; |
134 | ||
01b0e233 | 135 | case PT_WRITE_I: /* write the child's text space */ |
4147b3f6 BJ |
136 | /* |
137 | * If text, must assure exclusive use | |
138 | */ | |
139 | if (xp = u.u_procp->p_textp) { | |
140 | if (xp->x_count!=1 || xp->x_iptr->i_mode&ISVTX) | |
141 | goto error; | |
cdb14d96 | 142 | xp->x_flag |= XTRC; |
4147b3f6 BJ |
143 | } |
144 | i = -1; | |
883d0f83 BJ |
145 | if ((i = suiword((caddr_t)ipc.ip_addr, ipc.ip_data)) < 0) { |
146 | if (chgprot((caddr_t)ipc.ip_addr, RW) && | |
147 | chgprot((caddr_t)ipc.ip_addr+(sizeof(int)-1), RW)) | |
148 | i = suiword((caddr_t)ipc.ip_addr, ipc.ip_data); | |
149 | (void) chgprot((caddr_t)ipc.ip_addr, RO); | |
150 | (void) chgprot((caddr_t)ipc.ip_addr+(sizeof(int)-1), RO); | |
151 | } | |
4147b3f6 BJ |
152 | if (i < 0) |
153 | goto error; | |
154 | if (xp) | |
155 | xp->x_flag |= XWRIT; | |
156 | break; | |
157 | ||
01b0e233 | 158 | case PT_WRITE_D: /* write the child's data space */ |
4147b3f6 BJ |
159 | if (suword((caddr_t)ipc.ip_addr, 0) < 0) |
160 | goto error; | |
161 | (void) suword((caddr_t)ipc.ip_addr, ipc.ip_data); | |
162 | break; | |
163 | ||
01b0e233 | 164 | case PT_WRITE_U: /* write the child's u. */ |
4147b3f6 | 165 | i = (int)ipc.ip_addr; |
883d0f83 BJ |
166 | p = (int *)PHYSOFF(&u, i); |
167 | for (i=0; i<NIPCREG; i++) | |
4147b3f6 BJ |
168 | if (p == &u.u_ar0[ipcreg[i]]) |
169 | goto ok; | |
170 | if (p == &u.u_ar0[PS]) { | |
883d0f83 | 171 | ipc.ip_data |= PSL_USERSET; |
4147b3f6 BJ |
172 | ipc.ip_data &= ~PSL_USERCLR; |
173 | goto ok; | |
174 | } | |
175 | goto error; | |
176 | ||
177 | ok: | |
178 | *p = ipc.ip_data; | |
179 | break; | |
180 | ||
01b0e233 MK |
181 | case PT_STEP: /* single step the child */ |
182 | case PT_CONTINUE: /* continue the child */ | |
4147b3f6 BJ |
183 | if ((int)ipc.ip_addr != 1) |
184 | u.u_ar0[PC] = (int)ipc.ip_addr; | |
185 | if ((unsigned)ipc.ip_data > NSIG) | |
186 | goto error; | |
187 | u.u_procp->p_cursig = ipc.ip_data; /* see issig */ | |
01b0e233 | 188 | if (i == PT_STEP) |
4147b3f6 BJ |
189 | u.u_ar0[PS] |= PSL_T; |
190 | wakeup((caddr_t)&ipc); | |
191 | return (1); | |
192 | ||
01b0e233 | 193 | case PT_KILL: /* kill the child process */ |
4147b3f6 BJ |
194 | wakeup((caddr_t)&ipc); |
195 | exit(u.u_procp->p_cursig); | |
196 | ||
197 | default: | |
198 | error: | |
199 | ipc.ip_req = -1; | |
200 | } | |
201 | wakeup((caddr_t)&ipc); | |
202 | return (0); | |
203 | } |