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 | * | |
d7db4999 | 6 | * @(#)sys_process.c 7.16 (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" | |
d7db4999 MK |
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); | |
d7db4999 | 63 | if (p == 0 || p->p_stat != SSTOP || p->p_pptr != curp || |
8c7d0e2a | 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 | 87 | ((physadr)(p)+((o)/sizeof(((physadr)0)->r[0]))) |
6ce8aff2 WN |
88 | #if defined(i386) |
89 | #undef PC | |
90 | #undef SP | |
91 | #undef PS | |
92 | #undef R0 | |
93 | #undef R1 | |
94 | ||
95 | #define PC tEIP | |
96 | #define SP tESP | |
97 | #define PS tEFLAGS | |
98 | #define R0 tEDX | |
99 | #define R1 tECX | |
100 | #endif | |
883d0f83 | 101 | |
4147b3f6 BJ |
102 | /* |
103 | * Code that the child process | |
104 | * executes to implement the command | |
105 | * of the parent process in tracing. | |
106 | */ | |
82655668 KM |
107 | procxmt(p) |
108 | register struct proc *p; | |
4147b3f6 | 109 | { |
82655668 | 110 | register int i, *poff; |
4147b3f6 | 111 | |
82655668 | 112 | if (ipc.ip_lock != p->p_pid) |
4147b3f6 | 113 | return (0); |
82655668 | 114 | p->p_slptime = 0; |
4147b3f6 BJ |
115 | i = ipc.ip_req; |
116 | ipc.ip_req = 0; | |
117 | switch (i) { | |
118 | ||
01b0e233 | 119 | case PT_READ_I: /* read the child's text space */ |
4147b3f6 BJ |
120 | if (!useracc((caddr_t)ipc.ip_addr, 4, B_READ)) |
121 | goto error; | |
122 | ipc.ip_data = fuiword((caddr_t)ipc.ip_addr); | |
123 | break; | |
124 | ||
01b0e233 | 125 | case PT_READ_D: /* read the child's data space */ |
4147b3f6 BJ |
126 | if (!useracc((caddr_t)ipc.ip_addr, 4, B_READ)) |
127 | goto error; | |
128 | ipc.ip_data = fuword((caddr_t)ipc.ip_addr); | |
129 | break; | |
130 | ||
01b0e233 | 131 | case PT_READ_U: /* read the child's u. */ |
dc57440c KM |
132 | #ifdef HPUXCOMPAT |
133 | if (u.u_pcb.pcb_flags & PCB_HPUXTRACE) | |
134 | i = hpuxtobsduoff(ipc.ip_addr); | |
135 | else | |
136 | #endif | |
4147b3f6 | 137 | i = (int)ipc.ip_addr; |
dc57440c | 138 | if (i<0 || i > ctob(UPAGES)-sizeof(int)) |
4147b3f6 | 139 | goto error; |
883d0f83 | 140 | ipc.ip_data = *(int *)PHYSOFF(&u, i); |
4147b3f6 BJ |
141 | break; |
142 | ||
01b0e233 | 143 | case PT_WRITE_I: /* write the child's text space */ |
883d0f83 | 144 | if ((i = suiword((caddr_t)ipc.ip_addr, ipc.ip_data)) < 0) { |
9db58063 KM |
145 | vm_offset_t sa, ea; |
146 | int rv; | |
147 | ||
148 | sa = trunc_page((vm_offset_t)ipc.ip_addr); | |
149 | ea = round_page((vm_offset_t)ipc.ip_addr+sizeof(int)-1); | |
d7db4999 | 150 | rv = vm_map_protect(&p->p_vmspace->vm_map, sa, ea, |
9db58063 KM |
151 | VM_PROT_DEFAULT, FALSE); |
152 | if (rv == KERN_SUCCESS) { | |
883d0f83 | 153 | i = suiword((caddr_t)ipc.ip_addr, ipc.ip_data); |
d7db4999 MK |
154 | (void) vm_map_protect(&p->p_vmspace->vm_map, |
155 | sa, ea, VM_PROT_READ|VM_PROT_EXECUTE, | |
156 | FALSE); | |
9db58063 | 157 | } |
883d0f83 | 158 | } |
4147b3f6 BJ |
159 | if (i < 0) |
160 | goto error; | |
4147b3f6 BJ |
161 | break; |
162 | ||
01b0e233 | 163 | case PT_WRITE_D: /* write the child's data space */ |
4147b3f6 BJ |
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 | ||
01b0e233 | 169 | case PT_WRITE_U: /* write the child's u. */ |
dc57440c KM |
170 | #ifdef HPUXCOMPAT |
171 | if (u.u_pcb.pcb_flags & PCB_HPUXTRACE) | |
172 | i = hpuxtobsduoff(ipc.ip_addr); | |
173 | else | |
174 | #endif | |
4147b3f6 | 175 | i = (int)ipc.ip_addr; |
82655668 | 176 | poff = (int *)PHYSOFF(&u, i); |
883d0f83 | 177 | for (i=0; i<NIPCREG; i++) |
d7db4999 | 178 | if (poff == &p->p_regs[ipcreg[i]]) |
4147b3f6 | 179 | goto ok; |
d7db4999 | 180 | if (poff == &p->p_regs[PS]) { |
883d0f83 | 181 | ipc.ip_data |= PSL_USERSET; |
dc57440c | 182 | ipc.ip_data &= ~PSL_USERCLR; |
bf47fbca MK |
183 | #ifdef PSL_CM_CLR |
184 | if (ipc.ip_data & PSL_CM) | |
185 | ipc.ip_data &= ~PSL_CM_CLR; | |
186 | #endif | |
4147b3f6 BJ |
187 | goto ok; |
188 | } | |
dc57440c KM |
189 | #if defined(hp300) |
190 | #ifdef FPCOPROC | |
82655668 KM |
191 | if (poff >= (int *)u.u_pcb.pcb_fpregs.fpf_regs && |
192 | poff <= (int *)&u.u_pcb.pcb_fpregs.fpf_fpiar) | |
dc57440c KM |
193 | goto ok; |
194 | #endif | |
195 | #endif | |
4147b3f6 BJ |
196 | goto error; |
197 | ||
198 | ok: | |
82655668 | 199 | *poff = ipc.ip_data; |
4147b3f6 BJ |
200 | break; |
201 | ||
01b0e233 MK |
202 | case PT_STEP: /* single step the child */ |
203 | case PT_CONTINUE: /* continue the child */ | |
4147b3f6 | 204 | if ((int)ipc.ip_addr != 1) |
d7db4999 | 205 | p->p_regs[PC] = (int)ipc.ip_addr; |
4147b3f6 BJ |
206 | if ((unsigned)ipc.ip_data > NSIG) |
207 | goto error; | |
19dec745 | 208 | p->p_xstat = ipc.ip_data; /* see issig */ |
01b0e233 | 209 | if (i == PT_STEP) |
d7db4999 | 210 | p->p_regs[PS] |= PSL_T; |
4147b3f6 BJ |
211 | wakeup((caddr_t)&ipc); |
212 | return (1); | |
213 | ||
01b0e233 | 214 | case PT_KILL: /* kill the child process */ |
4147b3f6 | 215 | wakeup((caddr_t)&ipc); |
21d115dd | 216 | exit(p, (int)p->p_xstat); |
4147b3f6 BJ |
217 | |
218 | default: | |
219 | error: | |
220 | ipc.ip_req = -1; | |
221 | } | |
222 | wakeup((caddr_t)&ipc); | |
223 | return (0); | |
224 | } |