156 lines
4.4 KiB
C
156 lines
4.4 KiB
C
/* This file handles the process manager's part of debugging, using the
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* ptrace system call. Most of the commands are passed on to the system
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* task for completion.
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*
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* The debugging commands available are:
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* T_STOP stop the process
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* T_OK enable tracing by parent for this process
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* T_GETINS return value from instruction space
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* T_GETDATA return value from data space
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* T_GETUSER return value from user process table
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* T_SETINS set value in instruction space
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* T_SETDATA set value in data space
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* T_SETUSER set value in user process table
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* T_RESUME resume execution
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* T_EXIT exit
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* T_STEP set trace bit
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*
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* The T_OK and T_EXIT commands are handled here, and the T_RESUME and
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* T_STEP commands are partially handled here and completed by the system
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* task. The rest are handled entirely by the system task.
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*/
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#include "pm.h"
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#include <minix/com.h>
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#include <sys/ptrace.h>
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#include <signal.h>
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#include "mproc.h"
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#include "param.h"
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#define NIL_MPROC ((struct mproc *) 0)
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FORWARD _PROTOTYPE( struct mproc *find_proc, (pid_t lpid) );
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/*===========================================================================*
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* do_trace *
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*===========================================================================*/
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PUBLIC int do_trace()
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{
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register struct mproc *child;
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int r;
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/* the T_OK call is made by the child fork of the debugger before it execs
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* the process to be traced
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*/
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if (m_in.request == T_OK) { /* enable tracing by parent for this proc */
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mp->mp_flags |= TRACED;
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mp->mp_reply.reply_trace = 0;
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return(OK);
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}
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if (m_in.request == T_READB_INS)
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{
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/* Special hack for reading text segments */
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if (mp->mp_effuid != SUPER_USER)
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return(EPERM);
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if ((child=find_proc(m_in.pid))==NIL_MPROC)
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return(ESRCH);
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r= sys_trace(m_in.request,child->mp_endpoint,m_in.taddr,&m_in.data);
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if (r != OK) return(r);
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mp->mp_reply.reply_trace = m_in.data;
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return(OK);
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}
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if (m_in.request == T_WRITEB_INS)
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{
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/* Special hack for patching text segments */
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if (mp->mp_effuid != SUPER_USER)
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return(EPERM);
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if ((child=find_proc(m_in.pid))==NIL_MPROC)
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return(ESRCH);
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/* Should check for shared text */
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/* Make sure the text segment is not used as a source for shared
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* text.
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*/
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child->mp_ino= 0;
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child->mp_dev= 0;
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child->mp_ctime= 0;
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r= sys_trace(m_in.request,child->mp_endpoint,m_in.taddr,&m_in.data);
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if (r != OK) return(r);
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mp->mp_reply.reply_trace = m_in.data;
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return(OK);
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}
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if ((child=find_proc(m_in.pid))==NIL_MPROC || !(child->mp_flags & STOPPED)) {
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return(ESRCH);
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}
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/* all the other calls are made by the parent fork of the debugger to
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* control execution of the child
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*/
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switch (m_in.request) {
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case T_EXIT: /* exit */
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pm_exit(child, (int) m_in.data, TRUE /*for_trace*/);
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/* Do not reply to the caller until FS has processed the exit
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* request.
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*/
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return SUSPEND;
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case T_RESUME:
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case T_STEP: /* resume execution */
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if (m_in.data < 0 || m_in.data > _NSIG) return(EIO);
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if (m_in.data > 0) { /* issue signal */
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child->mp_flags &= ~TRACED; /* so signal is not diverted */
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sig_proc(child, (int) m_in.data);
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child->mp_flags |= TRACED;
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}
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child->mp_flags &= ~STOPPED;
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break;
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}
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r= sys_trace(m_in.request,child->mp_endpoint,m_in.taddr,&m_in.data);
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if (r != OK) return(r);
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mp->mp_reply.reply_trace = m_in.data;
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return(OK);
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}
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/*===========================================================================*
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* find_proc *
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*===========================================================================*/
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PRIVATE struct mproc *find_proc(lpid)
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pid_t lpid;
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{
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register struct mproc *rmp;
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for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++)
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if (rmp->mp_flags & IN_USE && rmp->mp_pid == lpid) return(rmp);
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return(NIL_MPROC);
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}
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/*===========================================================================*
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* stop_proc *
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*===========================================================================*/
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PUBLIC void stop_proc(rmp, signo)
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register struct mproc *rmp;
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int signo;
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{
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/* A traced process got a signal so stop it. */
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register struct mproc *rpmp = mproc + rmp->mp_parent;
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int r;
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r= sys_trace(-1, rmp->mp_endpoint, 0L, (long *) 0);
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if (r != OK) panic("pm", "sys_trace failed", r);
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rmp->mp_flags |= STOPPED;
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if (rpmp->mp_flags & WAITING) {
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rpmp->mp_flags &= ~WAITING; /* parent is no longer waiting */
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rpmp->mp_reply.reply_res2 = 0177 | (signo << 8);
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setreply(rmp->mp_parent, rmp->mp_pid);
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} else {
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rmp->mp_sigstatus = signo;
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}
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return;
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}
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