359 lines
8.9 KiB
C
359 lines
8.9 KiB
C
/*
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* Copyright (c) 1994, Sean Eric Fagan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Sean Eric Fagan.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: sys_process.c,v 1.12 1995/03/16 18:12:42 bde Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/ptrace.h>
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#include <sys/errno.h>
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#include <machine/reg.h>
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#include <machine/psl.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/vm_kern.h>
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#include <sys/user.h>
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static int
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pread (struct proc *procp, unsigned int addr, unsigned int *retval) {
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int rv;
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vm_map_t map, tmap;
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vm_object_t object;
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vm_offset_t kva = 0;
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int page_offset; /* offset into page */
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vm_offset_t pageno; /* page number */
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vm_map_entry_t out_entry;
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vm_prot_t out_prot;
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boolean_t wired, single_use;
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vm_offset_t off;
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/* Map page into kernel space */
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map = &procp->p_vmspace->vm_map;
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page_offset = addr - trunc_page(addr);
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pageno = trunc_page(addr);
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tmap = map;
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rv = vm_map_lookup (&tmap, pageno, VM_PROT_READ, &out_entry,
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&object, &off, &out_prot, &wired, &single_use);
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if (rv != KERN_SUCCESS)
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return EINVAL;
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vm_map_lookup_done (tmap, out_entry);
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/* Find space in kernel_map for the page we're interested in */
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rv = vm_map_find (kernel_map, object, off, &kva, PAGE_SIZE, 1);
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if (!rv) {
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vm_object_reference (object);
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rv = vm_map_pageable (kernel_map, kva, kva + PAGE_SIZE, 0);
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if (!rv) {
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*retval = 0;
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bcopy ((caddr_t)kva + page_offset,
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retval, sizeof *retval);
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}
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vm_map_remove (kernel_map, kva, kva + PAGE_SIZE);
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}
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return rv;
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}
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static int
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pwrite (struct proc *procp, unsigned int addr, unsigned int datum) {
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int rv;
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vm_map_t map, tmap;
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vm_object_t object;
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vm_offset_t kva = 0;
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int page_offset; /* offset into page */
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vm_offset_t pageno; /* page number */
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vm_map_entry_t out_entry;
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vm_prot_t out_prot;
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boolean_t wired, single_use;
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vm_offset_t off;
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boolean_t fix_prot = 0;
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/* Map page into kernel space */
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map = &procp->p_vmspace->vm_map;
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page_offset = addr - trunc_page(addr);
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pageno = trunc_page(addr);
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/*
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* Check the permissions for the area we're interested in.
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*/
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if (vm_map_check_protection (map, pageno, pageno + PAGE_SIZE,
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VM_PROT_WRITE) == FALSE) {
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/*
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* If the page was not writable, we make it so.
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* XXX It is possible a page may *not* be read/executable,
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* if a process changes that!
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*/
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fix_prot = 1;
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/* The page isn't writable, so let's try making it so... */
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if ((rv = vm_map_protect (map, pageno, pageno + PAGE_SIZE,
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VM_PROT_ALL, 0)) != KERN_SUCCESS)
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return EFAULT; /* I guess... */
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}
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/*
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* Now we need to get the page. out_entry, out_prot, wired, and
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* single_use aren't used. One would think the vm code would be
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* a *bit* nicer... We use tmap because vm_map_lookup() can
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* change the map argument.
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*/
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tmap = map;
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rv = vm_map_lookup (&tmap, pageno, VM_PROT_WRITE, &out_entry,
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&object, &off, &out_prot, &wired, &single_use);
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if (rv != KERN_SUCCESS) {
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return EINVAL;
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}
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/*
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* Okay, we've got the page. Let's release tmap.
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*/
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vm_map_lookup_done (tmap, out_entry);
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/*
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* Fault the page in...
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*/
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vm_map_pageable(map, trunc_page(vtopte(pageno)),
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trunc_page(vtopte(pageno)) + PAGE_SIZE, FALSE);
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rv = vm_fault(map, pageno, VM_PROT_WRITE|VM_PROT_READ, FALSE);
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vm_map_pageable(map, trunc_page(vtopte(pageno)),
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trunc_page(vtopte(pageno)) + PAGE_SIZE, TRUE);
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if (rv != KERN_SUCCESS)
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return EFAULT;
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/* Find space in kernel_map for the page we're interested in */
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rv = vm_map_find (kernel_map, object, off, &kva, PAGE_SIZE, 1);
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if (!rv) {
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vm_object_reference (object);
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rv = vm_map_pageable (kernel_map, kva, kva + PAGE_SIZE, 0);
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if (!rv) {
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bcopy (&datum, (caddr_t)kva + page_offset, sizeof datum);
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}
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vm_map_remove (kernel_map, kva, kva + PAGE_SIZE);
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}
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if (fix_prot)
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vm_map_protect (map, pageno, pageno + PAGE_SIZE,
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VM_PROT_READ|VM_PROT_EXECUTE, 0);
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return rv;
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}
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/*
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* Process debugging system call.
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*/
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struct ptrace_args {
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int req;
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pid_t pid;
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caddr_t addr;
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int data;
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};
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int
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ptrace(curp, uap, retval)
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struct proc *curp;
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struct ptrace_args *uap;
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int *retval;
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{
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struct proc *p;
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int error = 0;
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*retval = 0;
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if (uap->req == PT_TRACE_ME) {
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curp->p_flag |= P_TRACED;
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return 0;
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}
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if ((p = pfind(uap->pid)) == NULL) {
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return ESRCH;
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}
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#ifdef PT_ATTACH
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if (uap->req != PT_ATTACH && (
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(p->p_flag & P_TRACED) == 0 ||
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(p->p_tptr && curp != p->p_tptr) ||
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(!p->p_tptr && curp != p->p_pptr)))
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return ESRCH;
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#endif
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#ifdef PT_ATTACH
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if (uap->req != PT_ATTACH) {
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#endif
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if ((p->p_flag & P_TRACED) == 0)
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return EPERM;
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if (p->p_stat != SSTOP || (p->p_flag & P_WAITED) == 0)
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return EBUSY;
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#ifdef PT_ATTACH
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}
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#endif
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/*
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* XXX The PT_ATTACH code is completely broken. It will
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* be obsoleted by a /proc filesystem, so is it worth it
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* to fix it? (Answer, probably. So that'll be next,
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* I guess.)
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*/
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switch (uap->req) {
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#ifdef PT_ATTACH
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case PT_ATTACH:
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if (curp->p_ucred->cr_uid != 0 && (
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curp->p_ucred->cr_uid != p->p_ucred->cr_uid ||
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curp->p_ucred->cr_uid != p->p_cred->p_svuid))
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return EACCES;
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p->p_tptr = curp;
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p->p_flag |= P_TRACED;
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psignal(p, SIGSTOP);
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return 0;
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case PT_DETACH:
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if ((unsigned)uap->data >= NSIG)
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return EINVAL;
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p->p_flag &= ~P_TRACED;
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p->p_tptr = NULL;
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psignal(p->p_pptr, SIGCHLD);
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wakeup((caddr_t)p->p_pptr);
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s = splhigh();
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if (p->p_stat == SSTOP) {
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p->p_xstat = uap->data;
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setrunnable(p);
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} else if (uap->data) {
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psignal(p, uap->data);
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}
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splx(s);
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return 0;
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# ifdef PT_INHERIT
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case PT_INHERIT:
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if ((p->p_flag & P_TRACED) == 0)
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return ESRCH;
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return 0;
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# endif /* PT_INHERIT */
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#endif /* PT_ATTACH */
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case PT_READ_I:
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case PT_READ_D:
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if ((error = pread (p, (unsigned int)uap->addr, retval)))
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return error;
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return 0;
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case PT_WRITE_I:
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case PT_WRITE_D:
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if ((error = pwrite (p, (unsigned int)uap->addr,
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(unsigned int)uap->data)))
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return error;
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return 0;
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case PT_STEP:
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if ((error = ptrace_single_step (p)))
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return error;
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/* fallthrough */
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case PT_CONTINUE:
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/*
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* Continue at addr uap->addr with signal
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* uap->data; if uap->addr is 1, then we just
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* let the chips fall where they may.
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*
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* The only check I'll make right now is for
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* uap->data to be larger than NSIG; if so, we return
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* EINVAL.
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*/
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if (uap->data >= NSIG)
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return EINVAL;
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if (uap->addr != (caddr_t)1) {
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fill_eproc (p, &p->p_addr->u_kproc.kp_eproc);
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if ((error = ptrace_set_pc (p, (u_int)uap->addr)))
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return error;
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}
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p->p_xstat = uap->data;
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/* if (p->p_stat == SSTOP) */
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setrunnable (p);
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return 0;
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case PT_READ_U:
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if ((u_int)uap->addr > (UPAGES * NBPG - sizeof(int))) {
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return EFAULT;
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}
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p->p_addr->u_kproc.kp_proc = *p;
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fill_eproc (p, &p->p_addr->u_kproc.kp_eproc);
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*retval = *(int*)((u_int)p->p_addr + (u_int)uap->addr);
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return 0;
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case PT_WRITE_U:
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p->p_addr->u_kproc.kp_proc = *p;
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fill_eproc (p, &p->p_addr->u_kproc.kp_eproc);
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return ptrace_write_u(p, (vm_offset_t)uap->addr, uap->data);
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case PT_KILL:
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p->p_xstat = SIGKILL;
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setrunnable(p);
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return 0;
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#ifdef PT_GETREGS
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case PT_GETREGS:
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/*
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* copyout the registers into addr. There's no
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* size constraint!!! *GRRR*
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*/
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return ptrace_getregs(p, uap->addr);
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case PT_SETREGS:
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/*
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* copyin the registers from addr. Again, no
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* size constraint!!! *GRRRR*
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*/
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return ptrace_setregs (p, uap->addr);
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#endif /* PT_GETREGS */
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default:
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break;
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}
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return 0;
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}
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int
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trace_req(p)
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struct proc *p;
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{
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return 1;
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}
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