diff options
author | des <des@FreeBSD.org> | 2001-10-07 20:08:42 +0000 |
---|---|---|
committer | des <des@FreeBSD.org> | 2001-10-07 20:08:42 +0000 |
commit | 29c5c858fce0c57b6ec8d88ecac8c437e7eb7f31 (patch) | |
tree | 619938768546b5f4413bb8dc40f32a9f6cff02e7 /sys/fs/procfs/procfs_mem.c | |
parent | 6eea6dc1d4f5db40f3dc480af266ecd685f624a2 (diff) | |
download | FreeBSD-src-29c5c858fce0c57b6ec8d88ecac8c437e7eb7f31.zip FreeBSD-src-29c5c858fce0c57b6ec8d88ecac8c437e7eb7f31.tar.gz |
Dissociate ptrace from procfs.
Until now, the ptrace syscall was implemented as a wrapper that called
various functions in procfs depending on which ptrace operation was
requested. Most of these functions were themselves wrappers around
procfs_{read,write}_{,db,fp}regs(), with only some extra error checks,
which weren't necessary in the ptrace case anyway.
This commit moves procfs_rwmem() from procfs_mem.c into sys_process.c
(renaming it to proc_rwmem() in the process), and implements ptrace()
directly in terms of procfs_{read,write}_{,db,fp}regs() instead of
having it fake up a struct uio and then call procfs_do{,db,fp}regs().
It also moves the prototypes for procfs_{read,write}_{,db,fp}regs()
and proc_rwmem() from proc.h to ptrace.h, and marks all procfs files
except procfs_machdep.c as "optional procfs" instead of "standard".
Diffstat (limited to 'sys/fs/procfs/procfs_mem.c')
-rw-r--r-- | sys/fs/procfs/procfs_mem.c | 218 |
1 files changed, 1 insertions, 217 deletions
diff --git a/sys/fs/procfs/procfs_mem.c b/sys/fs/procfs/procfs_mem.c index 29773a0..95c91f2 100644 --- a/sys/fs/procfs/procfs_mem.c +++ b/sys/fs/procfs/procfs_mem.c @@ -40,11 +40,6 @@ * $FreeBSD$ */ -/* - * This is a lightly hacked and merged version - * of sef's pread/pwrite functions - */ - #include <sys/param.h> #include <sys/systm.h> #include <sys/lock.h> @@ -56,184 +51,6 @@ #include <fs/procfs/procfs.h> -#include <vm/vm.h> -#include <vm/vm_param.h> -#include <vm/pmap.h> -#include <vm/vm_extern.h> -#include <vm/vm_map.h> -#include <vm/vm_kern.h> -#include <vm/vm_object.h> -#include <vm/vm_page.h> - -static int procfs_rwmem __P((struct proc *curp, - struct proc *p, struct uio *uio)); - -static int -procfs_rwmem(curp, p, uio) - struct proc *curp; - struct proc *p; - struct uio *uio; -{ - int error; - int writing; - struct vmspace *vm; - vm_map_t map; - vm_object_t object = NULL; - vm_offset_t pageno = 0; /* page number */ - vm_prot_t reqprot; - vm_offset_t kva; - - GIANT_REQUIRED; - - /* - * if the vmspace is in the midst of being deallocated or the - * process is exiting, don't try to grab anything. The page table - * usage in that process can be messed up. - */ - vm = p->p_vmspace; - if ((p->p_flag & P_WEXIT)) - return EFAULT; - if (vm->vm_refcnt < 1) - return EFAULT; - ++vm->vm_refcnt; - /* - * The map we want... - */ - map = &vm->vm_map; - - writing = uio->uio_rw == UIO_WRITE; - reqprot = writing ? (VM_PROT_WRITE | VM_PROT_OVERRIDE_WRITE) : VM_PROT_READ; - - kva = kmem_alloc_pageable(kernel_map, PAGE_SIZE); - - /* - * Only map in one page at a time. We don't have to, but it - * makes things easier. This way is trivial - right? - */ - do { - vm_map_t tmap; - vm_offset_t uva; - int page_offset; /* offset into page */ - vm_map_entry_t out_entry; - vm_prot_t out_prot; - boolean_t wired; - vm_pindex_t pindex; - u_int len; - vm_page_t m; - - object = NULL; - - uva = (vm_offset_t) uio->uio_offset; - - /* - * Get the page number of this segment. - */ - pageno = trunc_page(uva); - page_offset = uva - pageno; - - /* - * How many bytes to copy - */ - len = min(PAGE_SIZE - page_offset, uio->uio_resid); - - /* - * Fault the page on behalf of the process - */ - error = vm_fault(map, pageno, reqprot, VM_FAULT_NORMAL); - if (error) { - error = EFAULT; - break; - } - - /* - * Now we need to get the page. out_entry, out_prot, wired, - * and single_use aren't used. One would think the vm code - * would be a *bit* nicer... We use tmap because - * vm_map_lookup() can change the map argument. - */ - tmap = map; - error = vm_map_lookup(&tmap, pageno, reqprot, - &out_entry, &object, &pindex, &out_prot, - &wired); - - if (error) { - error = EFAULT; - - /* - * Make sure that there is no residue in 'object' from - * an error return on vm_map_lookup. - */ - object = NULL; - - break; - } - - m = vm_page_lookup(object, pindex); - - /* Allow fallback to backing objects if we are reading */ - - while (m == NULL && !writing && object->backing_object) { - - pindex += OFF_TO_IDX(object->backing_object_offset); - object = object->backing_object; - - m = vm_page_lookup(object, pindex); - } - - if (m == NULL) { - error = EFAULT; - - /* - * Make sure that there is no residue in 'object' from - * an error return on vm_map_lookup. - */ - object = NULL; - - vm_map_lookup_done(tmap, out_entry); - - break; - } - - /* - * Wire the page into memory - */ - vm_page_wire(m); - - /* - * We're done with tmap now. - * But reference the object first, so that we won't loose - * it. - */ - vm_object_reference(object); - vm_map_lookup_done(tmap, out_entry); - - pmap_kenter(kva, VM_PAGE_TO_PHYS(m)); - - /* - * Now do the i/o move. - */ - error = uiomove((caddr_t)(kva + page_offset), len, uio); - - pmap_kremove(kva); - - /* - * release the page and the object - */ - vm_page_unwire(m, 1); - vm_object_deallocate(object); - - object = NULL; - - } while (error == 0 && uio->uio_resid > 0); - - if (object) - vm_object_deallocate(object); - - kmem_free(kernel_map, kva, PAGE_SIZE); - vmspace_free(vm); - return (error); -} - /* * Copy data in and out of the target process. * We do this by mapping the process's page into @@ -256,38 +73,5 @@ procfs_domem(curp, p, pfs, uio) if (error) return (error); - return (procfs_rwmem(curp, p, uio)); -} - -/* - * Given process (p), find the vnode from which - * its text segment is being executed. - * - * It would be nice to grab this information from - * the VM system, however, there is no sure-fire - * way of doing that. Instead, fork(), exec() and - * wait() all maintain the p_textvp field in the - * process proc structure which contains a held - * reference to the exec'ed vnode. - * - * XXX - Currently, this is not not used, as the - * /proc/pid/file object exposes an information leak - * that shouldn't happen. Using a mount option would - * make it configurable on a per-system (or, at least, - * per-mount) basis; however, that's not really best. - * The best way to do it, I think, would be as an - * ioctl; this would restrict it to the uid running - * program, or root, which seems a reasonable compromise. - * However, the number of applications for this is - * minimal, if it can't be seen in the filesytem space, - * and doint it as an ioctl makes it somewhat less - * useful due to the, well, inelegance. - * - */ -struct vnode * -procfs_findtextvp(p) - struct proc *p; -{ - - return (p->p_textvp); + return (proc_rwmem(p, uio)); } |