Eric napsal(a):
On Tue, Sep 19, 2006 at 10:31:38PM +0200, Daniel Smolik wrote:
Package: sparc-utils
Version: 1.9-2.5
Severity: important
In newer kernel > 2.6.18-rc1 is changed /dev/openprom interface (may be)
and eeprom tool dies with SIGBUS. On 2.6.17 works. There is a backtrace.
NU gdb 6.4.90-debian
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This GDB was configured as "sparc-linux-gnu"...Using host libthread_db
library "/lib/libthread_db.so.1".
(gdb) run
Starting program: /home/marvin/sparc-utils-1.9.orig/prtconf-1.3/eeprom
Program received signal SIGBUS, Bus error.
0x00012160 in main (argc=0, argv=<value optimized out>) at eeprom.c:661
661 *(int *)op->oprom_array = 0;
(gdb) bt
#0 0x00012160 in main (argc=0, argv=<value optimized out>) at eeprom.c:661
(gdb)
Hello Daniel,
I don't have access to a sparc workstation anymore. All those from
debian network are currently down, therefore it is hard for me to
investigate.
SIGBUS is raised on non aligned access. But I don't know why it fails
here. Code just above this line to set up 'op' pointer seems to be ok:
char buf2[4096];
struct openpromio *op = (struct openpromio *)buf2;
op is an alias to buf2. I guess buf2 is aligned on a 32-bits boundary
since it is allocated on stack and is a multiple of 4 bytes. Therefore I
cannot figure out what fails.
Did you recompile sparc-utils package?
Yes. I recompile eeprom.c with -ggdb.
What your asm/openpromio.h
header contains about openpromio struct definition?
The last I can find is from 2.6.17 kernel:
struct openpromio
{
u_int oprom_size; /* Actual size of the oprom_array. */
char oprom_array[1]; /* Holds property names and values. */
};
In my /usr/include/asm-sparc64 and /usr/src/linux-2.6.18-rc6 are tha same as you
have.
Could you print out addresses of 'op' pointer and op->oprom_array field
under gdb to see whether they are 32-bits aligned or not?
I am not very familiar with gdb but I test this:Starting program:
/home/marvin/sparc-utils-1.9.orig/prtconf-1.3/eeprom
main (argc=0, argv=0x0) at eeprom.c:775
775 if (argc && *argv)
(gdb) step
776 program_name = *argv;
(gdb) step
777 while ((c = getopt_long (argc, argv, "d:f:h", long_options, 0))
!= EOF)
(gdb) step
613 promfd = open(promdev, O_RDWR);
(gdb) step
614 if (promfd == -1) {
(gdb) step
622 prom_root_node = prom_getsibling(0);
(gdb) step
prom_getsibling (node=0) at eeprom.c:65
65 DECL_OP(sizeof(int));
(gdb) step
64 {
(gdb) step
67 if (node == -1) return 0;
(gdb) step
65 DECL_OP(sizeof(int));
(gdb) step
67 if (node == -1) return 0;
(gdb) step
69 if (ioctl (promfd, OPROMNEXT, op) < 0)
(gdb) step
68 *(int *)op->oprom_array = node;
(gdb) display op
1: op = (struct openpromio *) 0x0
(gdb) step
69 if (ioctl (promfd, OPROMNEXT, op) < 0)
1: op = (struct openpromio *) 0x0
(gdb) step
71 prom_current_node = *(int *)op->oprom_array;
1: op = (struct openpromio *) 0x0
(gdb) step
main (argc=-268262256, argv=0x2) at eeprom.c:623
623 if (!prom_root_node) {
(gdb) step
628 if (!uname (&u) && !strcmp (u.machine, "sparc64"))
(gdb) step
629 p1275 = 1;
(gdb) step
795 } else if (optind >= argc)
(gdb) step
657 struct openpromio *op = (struct openpromio *)buf2;
(gdb) display op
No symbol "op" in current context.
(gdb) display buf2
No symbol "buf2" in current context.
(gdb)
Best regards,
Eric.
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