| 1 | /* This file handles the process manager's part of debugging, using the
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| 2 | * ptrace system call. Most of the commands are passed on to the system
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| 3 | * task for completion.
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| 4 | *
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| 5 | * The debugging commands available are:
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| 6 | * T_STOP stop the process
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| 7 | * T_OK enable tracing by parent for this process
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| 8 | * T_GETINS return value from instruction space
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| 9 | * T_GETDATA return value from data space
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| 10 | * T_GETUSER return value from user process table
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| 11 | * T_SETINS set value in instruction space
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| 12 | * T_SETDATA set value in data space
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| 13 | * T_SETUSER set value in user process table
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| 14 | * T_RESUME resume execution
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| 15 | * T_EXIT exit
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| 16 | * T_STEP set trace bit
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| 17 | *
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| 18 | * The T_OK and T_EXIT commands are handled here, and the T_RESUME and
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| 19 | * T_STEP commands are partially handled here and completed by the system
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| 20 | * task. The rest are handled entirely by the system task.
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| 21 | */
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| 22 |
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| 23 | #include "pm.h"
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| 24 | #include <minix/com.h>
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| 25 | #include <sys/ptrace.h>
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| 26 | #include <signal.h>
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| 27 | #include "mproc.h"
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| 28 | #include "param.h"
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| 29 |
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| 30 | #define NIL_MPROC ((struct mproc *) 0)
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| 31 |
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| 32 | FORWARD _PROTOTYPE( struct mproc *find_proc, (pid_t lpid) );
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| 33 |
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| 34 | /*===========================================================================*
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| 35 | * do_trace *
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| 36 | *===========================================================================*/
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| 37 | PUBLIC int do_trace()
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| 38 | {
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| 39 | register struct mproc *child;
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| 40 |
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| 41 | /* the T_OK call is made by the child fork of the debugger before it execs
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| 42 | * the process to be traced
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| 43 | */
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| 44 | if (m_in.request == T_OK) { /* enable tracing by parent for this proc */
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| 45 | mp->mp_flags |= TRACED;
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| 46 | mp->mp_reply.reply_trace = 0;
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| 47 | return(OK);
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| 48 | }
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| 49 | if ((child=find_proc(m_in.pid))==NIL_MPROC || !(child->mp_flags & STOPPED)) {
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| 50 | return(ESRCH);
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| 51 | }
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| 52 | /* all the other calls are made by the parent fork of the debugger to
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| 53 | * control execution of the child
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| 54 | */
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| 55 | switch (m_in.request) {
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| 56 | case T_EXIT: /* exit */
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| 57 | pm_exit(child, (int) m_in.data);
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| 58 | mp->mp_reply.reply_trace = 0;
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| 59 | return(OK);
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| 60 | case T_RESUME:
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| 61 | case T_STEP: /* resume execution */
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| 62 | if (m_in.data < 0 || m_in.data > _NSIG) return(EIO);
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| 63 | if (m_in.data > 0) { /* issue signal */
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| 64 | child->mp_flags &= ~TRACED; /* so signal is not diverted */
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| 65 | sig_proc(child, (int) m_in.data);
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| 66 | child->mp_flags |= TRACED;
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| 67 | }
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| 68 | child->mp_flags &= ~STOPPED;
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| 69 | break;
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| 70 | }
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| 71 | if (sys_trace(m_in.request,(int)(child-mproc),m_in.taddr,&m_in.data) != OK)
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| 72 | return(-errno);
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| 73 | mp->mp_reply.reply_trace = m_in.data;
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| 74 | return(OK);
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| 75 | }
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| 76 |
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| 77 | /*===========================================================================*
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| 78 | * find_proc *
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| 79 | *===========================================================================*/
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| 80 | PRIVATE struct mproc *find_proc(lpid)
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| 81 | pid_t lpid;
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| 82 | {
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| 83 | register struct mproc *rmp;
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| 84 |
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| 85 | for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++)
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| 86 | if (rmp->mp_flags & IN_USE && rmp->mp_pid == lpid) return(rmp);
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| 87 | return(NIL_MPROC);
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| 88 | }
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| 89 |
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| 90 | /*===========================================================================*
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| 91 | * stop_proc *
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| 92 | *===========================================================================*/
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| 93 | PUBLIC void stop_proc(rmp, signo)
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| 94 | register struct mproc *rmp;
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| 95 | int signo;
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| 96 | {
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| 97 | /* A traced process got a signal so stop it. */
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| 98 |
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| 99 | register struct mproc *rpmp = mproc + rmp->mp_parent;
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| 100 |
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| 101 | if (sys_trace(-1, (int) (rmp - mproc), 0L, (long *) 0) != OK) return;
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| 102 | rmp->mp_flags |= STOPPED;
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| 103 | if (rpmp->mp_flags & WAITING) {
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| 104 | rpmp->mp_flags &= ~WAITING; /* parent is no longer waiting */
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| 105 | rpmp->mp_reply.reply_res2 = 0177 | (signo << 8);
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| 106 | setreply(rmp->mp_parent, rmp->mp_pid);
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| 107 | } else {
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| 108 | rmp->mp_sigstatus = signo;
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| 109 | }
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| 110 | return;
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| 111 | }
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