Date: Tue, 09 Feb 2010 16:11:43 -0800 From: Marcel Moolenaar <xcllnt@mac.com> To: Kostik Belousov <kostikbel@gmail.com> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r203696 - in head: lib/libc/sys sys/kern sys/sys Message-ID: <86989446-64EF-411F-8E25-173DB6AEE10B@mac.com> In-Reply-To: <896B58E6-12EA-48AB-86C2-5BA9F0C59512@mac.com> References: <201002090552.o195qZcD074581@svn.freebsd.org> <20100209095722.GQ9991@deviant.kiev.zoral.com.ua> <65DCE552-7EFD-48F2-85A4-EA0F1F0638EE@mac.com> <20100209184043.GV9991@deviant.kiev.zoral.com.ua> <896B58E6-12EA-48AB-86C2-5BA9F0C59512@mac.com>
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On Feb 9, 2010, at 11:17 AM, Marcel Moolenaar wrote:
> Action items:
>
>>>> - vmspace should be referenced by vmspace_acquire_ref()
>>>> - vm_map should be read-locked before iterating the map entries.
>
> I'll implement it and send a patch for review to avoid unnecessary
> repository churn...
Please review attached patch. I have a sample session of how
a debugger can use the information (see XXX lines):
hob% /usr/obj/nfs/bsddbg/trunk/bdb/bdb images/abort/abort
[cursor=0x2000000000000560:0]
bdb> run
process 1539 created
process 1539 stopped with signal 5
XXX: 1: 0x2000000000000000-0x2000000000001fff, 5, 0 37 `/nfs/bsddbg/trunk/images/abort/abort`
XXX: 2: 0x2000000000010000-0x2000000000011fff, 3, 0 0 ``
XXX: 3: 0x2000000040010000-0x2000000040077fff, 5, 0 21 `/libexec/ld-elf.so.1`
XXX: 4: 0x2000000040086000-0x2000000040089fff, 3, 0x66000 21 `/libexec/ld-elf.so.1`
XXX: 5: 0x200000004008a000-0x2000000040091fff, 3, 0 0 ``
XXX: 6: 0x8000000000000000-0x800000000001ffff, 3, 0 0 ``
XXX: 7: 0x9ffffffffffe0000-0x9fffffffffffffff, 3, 0 0 ``
0x200000004001c560: { // MFB;
> alloc r2 = ar.pfs, 0x0, 0x3, 0x3, 0x0
nop.f 0x0
nop.b 0x0 ;;
}
[cursor=0x200000004001c560:0]
bdb> step
process 1575 stopped with signal 5
0x200000004001c560: { // MFB;
alloc r2 = ar.pfs, 0x0, 0x3, 0x3, 0x0
> nop.f 0x0
nop.b 0x0 ;;
}
[cursor=0x200000004001c560:1]
bdb> continue
process 1539 stopped with signal 6
XXX: 1: 0x2000000000000000-0x2000000000001fff, 5, 0 37 `/nfs/bsddbg/trunk/images/abort/abort`
XXX: 2: 0x2000000000010000-0x2000000000011fff, 3, 0 0 ``
XXX: 3: 0x2000000040010000-0x2000000040077fff, 5, 0 21 `/libexec/ld-elf.so.1`
XXX: 4: 0x200000004007e000-0x2000000040085fff, 3, 0x6000 0 ``
XXX: 5: 0x2000000040086000-0x2000000040089fff, 3, 0x66000 21 `/libexec/ld-elf.so.1`
XXX: 6: 0x200000004008a000-0x2000000040099fff, 3, 0 0 ``
XXX: 7: 0x200000004009c000-0x20000000402e1fff, 5, 0 15 `/lib/libc.so.7`
XXX: 8: 0x20000000402e2000-0x20000000402effff, 0, 0x246000 0 ``
XXX: 9: 0x20000000402f0000-0x20000000402fdfff, 3, 0x244000 15 `/lib/libc.so.7`
XXX: 10: 0x20000000402fe000-0x2000000040319fff, 3, 0x262000 0 ``
XXX: 11: 0x2000000040328000-0x2000000040339fff, 3, 0xe000 0 ``
XXX: 12: 0x8000000000000000-0x800000000001ffff, 3, 0 0 ``
XXX: 13: 0x9ffffffffffe0000-0x9fffffffffffffff, 3, 0 0 ``
0x20000000402a0c40: { // MBB;
> cmp.eq p0, p6 = r0, r10
(p6) br.sptk.few 20000000400ded00
br.ret.sptk.few rp ;;
}
[cursor=0x20000000402a0c40:0]
bdb>
--
Marcel Moolenaar
xcllnt@mac.com
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Index: kern/sys_process.c
===================================================================
--- kern/sys_process.c (revision 203724)
+++ kern/sys_process.c (working copy)
@@ -75,7 +75,8 @@
};
struct ptrace_vm_entry32 {
- uint32_t pve_cookie;
+ int pve_entry;
+ int pve_timestamp;
uint32_t pve_start;
uint32_t pve_end;
uint32_t pve_offset;
@@ -363,42 +364,56 @@
vm_map_t map;
vm_map_entry_t entry;
vm_object_t obj, tobj, lobj;
+ struct vmspace *vm;
struct vnode *vp;
char *freepath, *fullpath;
u_int pathlen;
- int error, vfslocked;
+ int error, index, vfslocked;
- map = &p->p_vmspace->vm_map;
+ vm = vmspace_acquire_ref(p);
+ map = &vm->vm_map;
+ vm_map_lock_read(map);
+
entry = map->header.next;
- if (pve->pve_cookie != NULL) {
- while (entry != &map->header && entry != pve->pve_cookie)
- entry = entry->next;
- if (entry != pve->pve_cookie)
- return (EINVAL);
+ index = 0;
+ while (index < pve->pve_entry && entry != &map->header) {
entry = entry->next;
+ index++;
}
- while (entry != &map->header && (entry->eflags & MAP_ENTRY_IS_SUB_MAP))
+ if (index != pve->pve_entry) {
+ error = EINVAL;
+ goto out;
+ }
+ while (entry != &map->header &&
+ (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
entry = entry->next;
- if (entry == &map->header)
- return (ENOENT);
+ index++;
+ }
+ if (entry == &map->header) {
+ error = ENOENT;
+ goto out;
+ }
/* We got an entry. */
- pve->pve_cookie = entry;
+ pve->pve_entry = index + 1;
+ pve->pve_timestamp = map->timestamp;
pve->pve_start = entry->start;
pve->pve_end = entry->end - 1;
pve->pve_offset = entry->offset;
pve->pve_prot = entry->protection;
+ error = 0;
+
/* Backing object's path needed? */
if (pve->pve_pathlen == 0)
- return (0);
+ goto out;
pathlen = pve->pve_pathlen;
pve->pve_pathlen = 0;
obj = entry->object.vm_object;
if (obj == NULL)
- return (0);
+ goto out;
VM_OBJECT_LOCK(obj);
for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) {
@@ -420,7 +435,7 @@
vp = NULL;
if (vp == NULL)
- return (0);
+ goto out;
freepath = NULL;
fullpath = NULL;
@@ -429,7 +444,6 @@
vrele(vp);
VFS_UNLOCK_GIANT(vfslocked);
- error = 0;
if (fullpath != NULL) {
pve->pve_pathlen = strlen(fullpath) + 1;
if (pve->pve_pathlen <= pathlen) {
@@ -440,9 +454,40 @@
}
if (freepath != NULL)
free(freepath, M_TEMP);
+
+ out:
+ vm_map_unlock_read(map);
+ vmspace_free(vm);
return (error);
}
+#ifdef COMPAT_IA32
+static int
+ptrace_vm_entry32(struct thread *td, struct proc *p,
+ struct ptrace_vm_entry32 *pve32)
+{
+ struct ptrace_vm_entry pve;
+ int error;
+
+ pve.pve_entry = pve32->pve_entry;
+ pve.pve_pathlen = pve32->pve_pathlen;
+ pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
+
+ error = ptrace_vm_entry(td, p, &pve);
+ if (error == 0) {
+ pve32->pve_entry = pve.pve_entry;
+ pve32->pve_timestamp = pve.pve_timestamp;
+ pve32->pve_start = pve.pve_start;
+ pve32->pve_end = pve.pve_end;
+ pve32->pve_offset = pve.pve_offset;
+ pve32->pve_prot = pve.pve_prot;
+ }
+
+ pve32->pve_pathlen = pve.pve_pathlen;
+ return (error);
+}
+#endif /* COMPAT_IA32 */
+
/*
* Process debugging system call.
*/
@@ -1087,14 +1132,12 @@
break;
case PT_VM_ENTRY:
+ PROC_UNLOCK(p);
#ifdef COMPAT_IA32
- /* XXX to be implemented. */
- if (wrap32) {
- error = EDOOFUS;
- break;
- }
+ if (wrap32)
+ error = ptrace_vm_entry32(td, p, addr);
+ else
#endif
- PROC_UNLOCK(p);
error = ptrace_vm_entry(td, p, addr);
PROC_LOCK(p);
break;
Index: sys/ptrace.h
===================================================================
--- sys/ptrace.h (revision 203724)
+++ sys/ptrace.h (working copy)
@@ -104,7 +104,8 @@
/* Argument structure for PT_VM_ENTRY. */
struct ptrace_vm_entry {
- void *pve_cookie; /* Token used to iterate. */
+ int pve_entry; /* Entry number used for iteration. */
+ int pve_timestamp; /* Generation number of VM map. */
u_long pve_start; /* Start VA of range. */
u_long pve_end; /* End VA of range (incl). */
u_long pve_offset; /* Offset in backing object. */
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