sam@sam-desktop:~$ sudo gdb Xorg
[sudo] password for sam: 
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu"...
(gdb) break RADEONMapMMIO
Function "RADEONMapMMIO" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y

Breakpoint 1 (RADEONMapMMIO) pending.
(gdb) handle SIGUSR1 nostop
Signal        Stop	Print	Pass to program	Description
SIGUSR1       No	Yes	Yes		User defined signal 1
(gdb) run
Starting program: /usr/bin/Xorg 
[Thread debugging using libthread_db enabled]

This is a pre-release version of the X server from The X.Org Foundation.
It is not supported in any way.
Bugs may be filed in the bugzilla at http://bugs.freedesktop.org/.
Select the "xorg" product for bugs you find in this release.
Before reporting bugs in pre-release versions please check the
latest version in the X.Org Foundation git repository.
See http://wiki.x.org/wiki/GitPage for git access instructions.

X.Org X Server 1.4.99.906 (1.5.0 RC 6)
Release Date: 
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-15-server x86_64 Ubuntu
Current Operating System: Linux sam-desktop 2.6.26-5-generic #1 SMP Sun Aug 3 01:26:00 UTC 2008 x86_64
Build Date: 06 August 2008  11:28:30AM
xorg-server 2:1.4.99.906-1ubuntu3 (buildd@crested.buildd) 
	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Sat Aug  9 16:41:38 2008
(==) Using config file: "/etc/X11/xorg.conf"
[New Thread 0x7fd17afd66e0 (LWP 12533)]
[tcsetpgrp failed in terminal_inferior: Operation not permitted]
[Switching to Thread 0x7fd17afd66e0 (LWP 12533)]

Breakpoint 1, RADEONMapMMIO (pScrn=0x1687580) at ../../src/radeon_driver.c:358
358	../../src/radeon_driver.c: No such file or directory.
	in ../../src/radeon_driver.c
(gdb) break pci_device_map_range
Breakpoint 2 at 0x7fd17abcebb3: file ../../src/common_interface.c, line 217.
(gdb) cont
Continuing.

Breakpoint 2, pci_device_map_range (dev=0x16728b8, base=3491758080, 
    size=65536, map_flags=1, addr=0x168a788)
    at ../../src/common_interface.c:217
217	        (struct pci_device_private *) dev;
(gdb) full bt
Undefined command: "full".  Try "help".
(gdb) bt full
#0  pci_device_map_range (dev=0x16728b8, base=3491758080, size=65536, 
    map_flags=1, addr=0x168a788) at ../../src/common_interface.c:217
	devp = (struct pci_device_private * const) 0x168a788
	mappings = (struct pci_device_mapping *) 0x16728b8
	region = 0
	i = 23618224
	err = 2130640638
#1  0x00007fd17775df2d in RADEONMapMMIO (pScrn=0x1687580)
    at ../../src/radeon_driver.c:383
	info = (RADEONInfoPtr) 0x168a730
	pRADEONEnt = (RADEONEntPtr) 0x1687d10
	err = <value optimized out>
#2  0x00007fd17775fddb in RADEONPreInit (pScrn=0x1687580, flags=0)
    at ../../src/radeon_driver.c:2739
	pInt10 = <value optimized out>
	int10_save = <value optimized out>
	s = <value optimized out>
	crtc_max_X = <value optimized out>
	crtc_max_Y = <value optimized out>
	pRADEONEnt = (RADEONEntPtr) 0x1687d10
	pPriv = <value optimized out>
#3  0x0000000000469ce9 in InitOutput (pScreenInfo=0x7e37c0, argc=1, 
    argv=0x7fff82ff1888) at ../../../../hw/xfree86/common/xf86Init.c:749
---Type <return> to continue, or q <return> to quit---
	configured_device = <value optimized out>
	i = 0
	j = <value optimized out>
	k = <value optimized out>
	scr_index = <value optimized out>
	modulelist = <value optimized out>
	optionlist = (pointer *) 0x1678830
	layout = (screenLayoutPtr) 0x1666700
	screenpix24 = <value optimized out>
	pix24 = <value optimized out>
	pix24From = <value optimized out>
	autoconfig = <value optimized out>
#4  0x0000000000433116 in main (argc=1, argv=0x7fff82ff1888, 
    envp=0x7fff82ff1898) at ../../dix/main.c:358
	i = 0
	error = 0
	xauthfile = <value optimized out>
	alwaysCheckForInput = {0, 1}
(gdb) list
212	pci_device_map_range(struct pci_device *dev, pciaddr_t base,
213	                     pciaddr_t size, unsigned map_flags,
214	                     void **addr)
215	{
216	    struct pci_device_private *const devp =
217	        (struct pci_device_private *) dev;
218	    struct pci_device_mapping *mappings;
219	    unsigned region;
220	    unsigned i;
221	    int err = 0;
(gdb) next
221	    int err = 0;
(gdb) next
224	    *addr = NULL;
(gdb) next
226	    if (dev == NULL) {
(gdb) next
231	    for (region = 0; region < 6; region++) {
(gdb) next
232	        const struct pci_mem_region const* r = &dev->regions[region];
(gdb) next
234	        if (r->size != 0) {
(gdb) next
235	            if ((r->base_addr <= base) && ((r->base_addr + r->size) > base)) {
(gdb) next
231	    for (region = 0; region < 6; region++) {
(gdb) next
232	        const struct pci_mem_region const* r = &dev->regions[region];
(gdb) info locals
r = (const struct pci_mem_region *) 0x16728d0
devp = (struct pci_device_private * const) 0x16728b8
mappings = (struct pci_device_mapping *) 0x16728b8
region = 1
i = 23618224
err = 0
(gdb) next
234	        if (r->size != 0) {
(gdb) next
231	    for (region = 0; region < 6; region++) {
(gdb) info locals
devp = (struct pci_device_private * const) 0x16728b8
mappings = (struct pci_device_mapping *) 0x16728b8
region = 1
i = 23618224
err = 0
(gdb) next
232	        const struct pci_mem_region const* r = &dev->regions[region];
(gdb) next
234	        if (r->size != 0) {
(gdb) next
235	            if ((r->base_addr <= base) && ((r->base_addr + r->size) > base)) {
(gdb) next
236	                if ((base + size) > (r->base_addr + r->size)) {
(gdb) next
245	    if (region > 5) {
(gdb) info locals
devp = (struct pci_device_private * const) 0x16728b8
mappings = (struct pci_device_mapping *) 0x16728b8
region = 2
i = 23618224
err = 0
(gdb) next
252	    for (i = 0; i < devp->num_mappings; i++) {
(gdb) display region
1: region = 2
(gdb) next
260	    mappings = realloc(devp->mappings,
1: region = 2
(gdb) next
262	    if (mappings == NULL) {
1: region = 2
(gdb) next
266	    mappings[devp->num_mappings].base = base;
1: region = 2
(gdb) next
267	    mappings[devp->num_mappings].size = size;
1: region = 2
(gdb) next
268	    mappings[devp->num_mappings].region = region;
1: region = 2
(gdb) next
269	    mappings[devp->num_mappings].flags = map_flags;
1: region = 2
(gdb) next
270	    mappings[devp->num_mappings].memory = NULL;
1: region = 2
(gdb) next
272	    if (dev->regions[region].memory == NULL) {
1: region = 2
(gdb) next
273	        err = (*pci_sys->methods->map_range)(dev,
1: region = 2
(gdb) info locals 
devp = (struct pci_device_private * const) 0x16728b8
mappings = (struct pci_device_mapping *) 0x168b300
region = 2
i = 0
err = 0
(gdb) list
268	    mappings[devp->num_mappings].region = region;
269	    mappings[devp->num_mappings].flags = map_flags;
270	    mappings[devp->num_mappings].memory = NULL;
271	
272	    if (dev->regions[region].memory == NULL) {
273	        err = (*pci_sys->methods->map_range)(dev,
274	                                             &mappings[devp->num_mappings]);
275	    }
276	
277	    if (err == 0) {
(gdb) print *mappings
$1 = {base = 3491758080, size = 65536, region = 2, flags = 1, memory = 0x0}
(gdb) print devp->num_mappings
$2 = 0
(gdb) print pci_sys->methods->map_range
$3 = (int (*)(struct pci_device *, struct pci_device_mapping
     *)) 0x7fd17abd10db <pci_device_linux_sysfs_map_range>
(gdb) step
pci_device_linux_sysfs_map_range (dev=0x16728b8, map=0x168b300)
    at ../../src/linux_sysfs.c:507
507	{
(gdb) list
502	 * \c mmap64 may need to be used.
503	 */
504	static int
505	pci_device_linux_sysfs_map_range(struct pci_device *dev,
506	                                 struct pci_device_mapping *map)
507	{
508	    char name[256];
509	    int fd;
510	    int err = 0;
511	    const int prot = ((map->flags & PCI_DEV_MAP_FLAG_WRITABLE) != 0) 
(gdb) bt full
#0  pci_device_linux_sysfs_map_range (dev=0x16728b8, map=0x168b300)
    at ../../src/linux_sysfs.c:507
	name = "P\025�\202�\177\000\000�bh\001\000\000\000\000f;sw�\177\000\000\210R�x�\177\000\000@\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000�|h\001\000\000\000\000\020\025�\202�\177\000\000b{O\000\000\000\000\000P\000\000\000\000\000\000\000�\024�\202�\177\000\000�\024�\202�\177\000\000�\024�\202�\177\000\000 ", '\0' <repeats 11 times>, "\003\000\000\000\020\025�\202�\177\000\0006`�x�\177\000\000�|h\001\000\000\000\000{�H\000\000\000\000\000\000\000\000\000\003\000\000\000\000z\ay�\177\000\000p̼z�\177\000\000�\004�z�\177\000\000\000\000\000\000\000\000\000\000�"...
	fd = 0
	err = 23619080
	prot = 0
	open_flags = 0
	offset = 4318442672
	sentry = {base = 64, size = 2027418777, type = 32721}
#1  0x00007fd17abcee1f in pci_device_map_range (dev=0x16728b8, 
    base=3491758080, size=65536, map_flags=1, addr=0x168a788)
    at ../../src/common_interface.c:273
	devp = (struct pci_device_private * const) 0x16728b8
	mappings = (struct pci_device_mapping *) 0x168b300
	region = 2
	i = 0
---Type <return> to continue, or q <return> to quit---
	err = 0
#2  0x00007fd17775df2d in RADEONMapMMIO (pScrn=0x1687580)
    at ../../src/radeon_driver.c:383
	info = (RADEONInfoPtr) 0x168a730
	pRADEONEnt = (RADEONEntPtr) 0x1687d10
	err = <value optimized out>
#3  0x00007fd17775fddb in RADEONPreInit (pScrn=0x1687580, flags=0)
    at ../../src/radeon_driver.c:2739
	pInt10 = <value optimized out>
	int10_save = <value optimized out>
	s = <value optimized out>
	crtc_max_X = <value optimized out>
	crtc_max_Y = <value optimized out>
	pRADEONEnt = (RADEONEntPtr) 0x1687d10
	pPriv = <value optimized out>
#4  0x0000000000469ce9 in InitOutput (pScreenInfo=0x7e37c0, argc=1, 
    argv=0x7fff82ff1888) at ../../../../hw/xfree86/common/xf86Init.c:749
	configured_device = <value optimized out>
	i = 0
	j = <value optimized out>
	k = <value optimized out>
	scr_index = <value optimized out>
	modulelist = <value optimized out>
---Type <return> to continue, or q <return> to quit---
	optionlist = (pointer *) 0x1678830
	layout = (screenLayoutPtr) 0x1666700
	screenpix24 = <value optimized out>
	pix24 = <value optimized out>
	pix24From = <value optimized out>
	autoconfig = <value optimized out>
#5  0x0000000000433116 in main (argc=1, argv=0x7fff82ff1888, 
    envp=0x7fff82ff1898) at ../../dix/main.c:358
	i = 0
	error = 0
	xauthfile = <value optimized out>
	alwaysCheckForInput = {0, 1}
(gdb) info locals 
name = "P\025�\202�\177\000\000�bh\001\000\000\000\000f;sw�\177\000\000\210R�x�\177\000\000@\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000�|h\001\000\000\000\000\020\025�\202�\177\000\000b{O\000\000\000\000\000P\000\000\000\000\000\000\000�\024�\202�\177\000\000�\024�\202�\177\000\000�\024�\202�\177\000\000 ", '\0' <repeats 11 times>, "\003\000\000\000\020\025�\202�\177\000\0006`�x�\177\000\000�|h\001\000\000\000\000{�H\000\000\000\000\000\000\000\000\000\003\000\000\000\000z\ay�\177\000\000p̼z�\177\000\000�\004�z�\177\000\000\000\000\000\000\000\000\000\000�"...
fd = 0
err = 23619080
prot = 0
open_flags = 0
offset = 4318442672
sentry = {base = 64, size = 2027418777, type = 32721}
(gdb) next
510	    int err = 0;
(gdb) next
512	        ? (PROT_READ | PROT_WRITE) : PROT_READ;
(gdb) next
514	        ? O_RDWR : O_RDONLY;
(gdb) next
515	    const off_t offset = map->base - dev->regions[map->region].base_addr;
(gdb) next
521	    };
(gdb) next
524	    snprintf(name, 255, "%s/%04x:%02x:%02x.%1u/resource%u",
(gdb) 
532	    fd = open(name, open_flags);
(gdb) list
527	             dev->bus,
528	             dev->dev,
529	             dev->func,
530	             map->region);
531	
532	    fd = open(name, open_flags);
533	    if (fd == -1) {
534	        return errno;
535	    }
536	
(gdb) print name
$4 = "/sys/bus/pci/devices/0000:08:00.0/resource2\000\000\000\000\000\001\000\000\000\000\000\000\000�|h\001\000\000\000\000\020\025�\202�\177\000\000b{O\000\000\000\000\000P\000\000\000\000\000\000\000�\024�\202�\177\000\000�\024�\202�\177\000\000�\024�\202�\177\000\000 ", '\0' <repeats 11 times>, "\003\000\000\000\020\025�\202�\177\000\0006`�x�\177\000\000�|h\001\000\000\000\000{�H\000\000\000\000\000\000\000\000\000\003\000\000\000\000z\ay�\177\000\000p̼z�\177\000\000�\004�z�\177\000\000\000\000\000\000\000\000\000\000�"...
(gdb) next
533	    if (fd == -1) {
(gdb) next
538	    map->memory = mmap(NULL, map->size, prot, MAP_SHARED, fd, offset);
(gdb) list
533	    if (fd == -1) {
534	        return errno;
535	    }
536	
537	
538	    map->memory = mmap(NULL, map->size, prot, MAP_SHARED, fd, offset);
539	    if (map->memory == MAP_FAILED) {
540	        map->memory = NULL;
541		close(fd);
542		return errno;
(gdb) print *map
$5 = {base = 3491758080, size = 65536, region = 2, flags = 1, memory = 0x0}
(gdb) info locals
name = "/sys/bus/pci/devices/0000:08:00.0/resource2\000\000\000\000\000\001\000\000\000\000\000\000\000�|h\001\000\000\000\000\020\025�\202�\177\000\000b{O\000\000\000\000\000P\000\000\000\000\000\000\000�\024�\202�\177\000\000�\024�\202�\177\000\000�\024�\202�\177\000\000 ", '\0' <repeats 11 times>, "\003\000\000\000\020\025�\202�\177\000\0006`�x�\177\000\000�|h\001\000\000\000\000{�H\000\000\000\000\000\000\000\000\000\003\000\000\000\000z\ay�\177\000\000p̼z�\177\000\000�\004�z�\177\000\000\000\000\000\000\000\000\000\000�"...
fd = 11
err = 0
prot = 3
open_flags = 2
offset = 0
sentry = {base = 3491758080, size = 65536, type = 0}
(gdb) next