Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
c4ec2128 | 2 | * Copyright (c) 1982, 1986, 1989 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 | * | |
9db58063 | 6 | * @(#)sys_process.c 7.14 (Berkeley) %G% |
da7c5cc6 | 7 | */ |
961945a8 | 8 | |
ff32eb64 | 9 | #define IPCREG |
94368568 | 10 | #include "param.h" |
d9c2f47f | 11 | #include "user.h" |
94368568 | 12 | #include "proc.h" |
c4ec2128 | 13 | #include "vnode.h" |
94368568 | 14 | #include "seg.h" |
94368568 | 15 | #include "buf.h" |
01b0e233 | 16 | #include "ptrace.h" |
9ce4de2d | 17 | |
d301d150 KM |
18 | #include "machine/reg.h" |
19 | #include "machine/psl.h" | |
9db58063 KM |
20 | #include "../vm/vm_page.h" |
21 | #include "../vm/vm_prot.h" | |
d301d150 | 22 | |
4147b3f6 BJ |
23 | /* |
24 | * Priority for tracing | |
25 | */ | |
26 | #define IPCPRI PZERO | |
27 | ||
28 | /* | |
29 | * Tracing variables. | |
30 | * Used to pass trace command from | |
31 | * parent to child being traced. | |
32 | * This data base cannot be | |
33 | * shared and is locked | |
34 | * per user. | |
35 | */ | |
36 | struct { | |
37 | int ip_lock; | |
38 | int ip_req; | |
39 | int *ip_addr; | |
40 | int ip_data; | |
41 | } ipc; | |
42 | ||
43 | /* | |
44 | * sys-trace system call. | |
45 | */ | |
8c7d0e2a KM |
46 | ptrace(curp, uap, retval) |
47 | struct proc *curp; | |
48 | register struct args { | |
4147b3f6 BJ |
49 | int req; |
50 | int pid; | |
51 | int *addr; | |
52 | int data; | |
53 | } *uap; | |
8c7d0e2a KM |
54 | int *retval; |
55 | { | |
56 | register struct proc *p; | |
4147b3f6 | 57 | |
4147b3f6 | 58 | if (uap->req <= 0) { |
8c7d0e2a | 59 | curp->p_flag |= STRC; |
d9c2f47f | 60 | return (0); |
4147b3f6 BJ |
61 | } |
62 | p = pfind(uap->pid); | |
8c7d0e2a KM |
63 | if (p == 0 || p->p_stat != SSTOP || p->p_ppid != curp->p_pid || |
64 | !(p->p_flag & STRC)) | |
d9c2f47f | 65 | return (ESRCH); |
4147b3f6 BJ |
66 | while (ipc.ip_lock) |
67 | sleep((caddr_t)&ipc, IPCPRI); | |
68 | ipc.ip_lock = p->p_pid; | |
69 | ipc.ip_data = uap->data; | |
70 | ipc.ip_addr = uap->addr; | |
71 | ipc.ip_req = uap->req; | |
72 | p->p_flag &= ~SWTED; | |
73 | while (ipc.ip_req > 0) { | |
74 | if (p->p_stat==SSTOP) | |
75 | setrun(p); | |
76 | sleep((caddr_t)&ipc, IPCPRI); | |
77 | } | |
8c7d0e2a | 78 | *retval = ipc.ip_data; |
4147b3f6 BJ |
79 | ipc.ip_lock = 0; |
80 | wakeup((caddr_t)&ipc); | |
8c7d0e2a | 81 | if (ipc.ip_req < 0) |
d9c2f47f MK |
82 | return (EIO); |
83 | return (0); | |
4147b3f6 BJ |
84 | } |
85 | ||
fc0890b1 | 86 | #define PHYSOFF(p, o) \ |
883d0f83 BJ |
87 | ((physadr)(p)+((o)/sizeof(((physadr)0)->r[0]))) |
88 | ||
4147b3f6 BJ |
89 | /* |
90 | * Code that the child process | |
91 | * executes to implement the command | |
92 | * of the parent process in tracing. | |
93 | */ | |
82655668 KM |
94 | procxmt(p) |
95 | register struct proc *p; | |
4147b3f6 | 96 | { |
82655668 | 97 | register int i, *poff; |
4147b3f6 | 98 | |
82655668 | 99 | if (ipc.ip_lock != p->p_pid) |
4147b3f6 | 100 | return (0); |
82655668 | 101 | p->p_slptime = 0; |
4147b3f6 BJ |
102 | i = ipc.ip_req; |
103 | ipc.ip_req = 0; | |
104 | switch (i) { | |
105 | ||
01b0e233 | 106 | case PT_READ_I: /* read the child's text space */ |
4147b3f6 BJ |
107 | if (!useracc((caddr_t)ipc.ip_addr, 4, B_READ)) |
108 | goto error; | |
109 | ipc.ip_data = fuiword((caddr_t)ipc.ip_addr); | |
110 | break; | |
111 | ||
01b0e233 | 112 | case PT_READ_D: /* read the child's data space */ |
4147b3f6 BJ |
113 | if (!useracc((caddr_t)ipc.ip_addr, 4, B_READ)) |
114 | goto error; | |
115 | ipc.ip_data = fuword((caddr_t)ipc.ip_addr); | |
116 | break; | |
117 | ||
01b0e233 | 118 | case PT_READ_U: /* read the child's u. */ |
dc57440c KM |
119 | #ifdef HPUXCOMPAT |
120 | if (u.u_pcb.pcb_flags & PCB_HPUXTRACE) | |
121 | i = hpuxtobsduoff(ipc.ip_addr); | |
122 | else | |
123 | #endif | |
4147b3f6 | 124 | i = (int)ipc.ip_addr; |
dc57440c | 125 | if (i<0 || i > ctob(UPAGES)-sizeof(int)) |
4147b3f6 | 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 */ |
883d0f83 | 131 | if ((i = suiword((caddr_t)ipc.ip_addr, ipc.ip_data)) < 0) { |
9db58063 KM |
132 | vm_offset_t sa, ea; |
133 | int rv; | |
134 | ||
135 | sa = trunc_page((vm_offset_t)ipc.ip_addr); | |
136 | ea = round_page((vm_offset_t)ipc.ip_addr+sizeof(int)-1); | |
137 | rv = vm_map_protect(p->p_map, sa, ea, | |
138 | VM_PROT_DEFAULT, FALSE); | |
139 | if (rv == KERN_SUCCESS) { | |
883d0f83 | 140 | i = suiword((caddr_t)ipc.ip_addr, ipc.ip_data); |
9db58063 KM |
141 | (void) vm_map_protect(p->p_map, sa, ea, |
142 | VM_PROT_READ|VM_PROT_EXECUTE, FALSE); | |
143 | } | |
883d0f83 | 144 | } |
4147b3f6 BJ |
145 | if (i < 0) |
146 | goto error; | |
4147b3f6 BJ |
147 | break; |
148 | ||
01b0e233 | 149 | case PT_WRITE_D: /* write the child's data space */ |
4147b3f6 BJ |
150 | if (suword((caddr_t)ipc.ip_addr, 0) < 0) |
151 | goto error; | |
152 | (void) suword((caddr_t)ipc.ip_addr, ipc.ip_data); | |
153 | break; | |
154 | ||
01b0e233 | 155 | case PT_WRITE_U: /* write the child's u. */ |
dc57440c KM |
156 | #ifdef HPUXCOMPAT |
157 | if (u.u_pcb.pcb_flags & PCB_HPUXTRACE) | |
158 | i = hpuxtobsduoff(ipc.ip_addr); | |
159 | else | |
160 | #endif | |
4147b3f6 | 161 | i = (int)ipc.ip_addr; |
82655668 | 162 | poff = (int *)PHYSOFF(&u, i); |
883d0f83 | 163 | for (i=0; i<NIPCREG; i++) |
82655668 | 164 | if (poff == &u.u_ar0[ipcreg[i]]) |
4147b3f6 | 165 | goto ok; |
82655668 | 166 | if (poff == &u.u_ar0[PS]) { |
883d0f83 | 167 | ipc.ip_data |= PSL_USERSET; |
dc57440c | 168 | ipc.ip_data &= ~PSL_USERCLR; |
bf47fbca MK |
169 | #ifdef PSL_CM_CLR |
170 | if (ipc.ip_data & PSL_CM) | |
171 | ipc.ip_data &= ~PSL_CM_CLR; | |
172 | #endif | |
4147b3f6 BJ |
173 | goto ok; |
174 | } | |
dc57440c KM |
175 | #if defined(hp300) |
176 | #ifdef FPCOPROC | |
82655668 KM |
177 | if (poff >= (int *)u.u_pcb.pcb_fpregs.fpf_regs && |
178 | poff <= (int *)&u.u_pcb.pcb_fpregs.fpf_fpiar) | |
dc57440c KM |
179 | goto ok; |
180 | #endif | |
181 | #endif | |
4147b3f6 BJ |
182 | goto error; |
183 | ||
184 | ok: | |
82655668 | 185 | *poff = ipc.ip_data; |
4147b3f6 BJ |
186 | break; |
187 | ||
01b0e233 MK |
188 | case PT_STEP: /* single step the child */ |
189 | case PT_CONTINUE: /* continue the child */ | |
4147b3f6 BJ |
190 | if ((int)ipc.ip_addr != 1) |
191 | u.u_ar0[PC] = (int)ipc.ip_addr; | |
192 | if ((unsigned)ipc.ip_data > NSIG) | |
193 | goto error; | |
19dec745 | 194 | p->p_xstat = ipc.ip_data; /* see issig */ |
01b0e233 | 195 | if (i == PT_STEP) |
4147b3f6 BJ |
196 | u.u_ar0[PS] |= PSL_T; |
197 | wakeup((caddr_t)&ipc); | |
198 | return (1); | |
199 | ||
01b0e233 | 200 | case PT_KILL: /* kill the child process */ |
4147b3f6 | 201 | wakeup((caddr_t)&ipc); |
21d115dd | 202 | exit(p, (int)p->p_xstat); |
4147b3f6 BJ |
203 | |
204 | default: | |
205 | error: | |
206 | ipc.ip_req = -1; | |
207 | } | |
208 | wakeup((caddr_t)&ipc); | |
209 | return (0); | |
210 | } |