Hi Damjan,
I tried to rewrite the function reading CPU info from /proc/cpuinfo, using VPP
style functions, for multi-arch dynamic function selection.
But function unformat_check_input failed and crashed.
I pasted the /proc/cpuinfo reading function and gdb process as below.
Could you suggest on this issue?
static inline int
clib_cpu_supports_implements (const u32 implid, const u32 partid)
{
u32 implementer = -1, part = -1;
int fd;
unformat_input_t input;
fd = open ("/proc/cpuinfo", 0);
if (fd < 0)
return 0;
unformat_init_clib_file (&input, fd);
while (unformat_check_input (&input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (&input, "CPU implementer : %x", &implementer))
;
else if (unformat (&input, "CPU part : %x", &part))
;
else
unformat_skip_line (&input);
if ((-1 != implementer) && (-1 != part))
break;
}
unformat_free (&input);
close (fd);
printf("++++++++++ %x %x\n", implementer, part);
if ((implid == implementer) && (partid == part))
return 1;
else
return 0;
}
lijian@net-arm-thunderx2:~/tasks/vpp.upstream/vpp$ sudo gdb
./build-root/build-vpp_debug-native/vpp/bin/vpp -c /home/lijian/startup.conf
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Reading symbols from ./build-root/build-vpp_debug-native/vpp/bin/vpp...done.
"/home/lijian/startup.conf" is not a core dump: File format not recognized
(gdb) b clib_cpu_supports_implements
Function "clib_cpu_supports_implements" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (clib_cpu_supports_implements) pending.
(gdb) run -c /home/lijian/startup.conf
Starting program:
/home/lijian/tasks/vpp.upstream/vpp/build-root/build-vpp_debug-native/vpp/bin/vpp
-c /home/lijian/startup.conf
warning: Unable to determine the number of hardware watchpoints available.
warning: Unable to determine the number of hardware breakpoints available.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
Breakpoint 1, clib_cpu_supports_implements (implid=81, partid=3072) at
/home/lijian/tasks/vpp.upstream/vpp/src/vppinfra/cpu.h:28
28 {
(gdb) bt
#0 clib_cpu_supports_implements (implid=81, partid=3072) at
/home/lijian/tasks/vpp.upstream/vpp/src/vppinfra/cpu.h:28
#1 0x0000ffffbeac4294 in clib_cpu_march_priority_qdf24xx () at
/home/lijian/tasks/vpp.upstream/vpp/src/vppinfra/cpu.h:248
#2 0x0000ffffbeac5c04 in svm_fifo_enqueue_nowait_march_constructor_qdf24xx ()
at /home/lijian/tasks/vpp.upstream/vpp/src/svm/svm_fifo.c:457
#3 0x0000ffffbf6dfb60 in call_init (l=<optimized out>, argc=argc@entry=3,
argv=argv@entry=0xfffffffff5f8, env=env@entry=0xfffffffff618) at dl-init.c:72
#4 0x0000ffffbf6dfca8 in call_init (env=0xfffffffff618, argv=0xfffffffff5f8,
argc=3, l=<optimized out>) at dl-init.c:30
#5 _dl_init (main_map=0xffffbf700190, argc=3, argv=0xfffffffff5f8,
env=0xfffffffff618) at dl-init.c:120
#6 0x0000ffffbf6d2d44 in _dl_start_user () from /lib/ld-linux-aarch64.so.1
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) n
29 u32 implementer = -1, part = -1;
(gdb)
33 fd = open ("/proc/cpuinfo", 0);
(gdb)
34 if (fd < 0)
(gdb)
37 unformat_init_clib_file (&input, fd);
(gdb)
39 while (unformat_check_input (&input) != UNFORMAT_END_OF_INPUT)
(gdb) p input
$1 = {buffer = 0x0, index = 0, buffer_marks = 0x0, fill_buffer = 0xffffbea41188
<clib_file_fill_buffer>, fill_buffer_arg = 0x3}
(gdb) s
unformat_check_input (i=0xfffffffff4f0) at
/home/lijian/tasks/vpp.upstream/vpp/src/vppinfra/format.h:171
171 {
(gdb) n
175 if (i->index >= vec_len (i->buffer) && i->index !=
UNFORMAT_END_OF_INPUT)
(gdb)
179 _unformat_fill_input (i);
(gdb) s
_unformat_fill_input (i=0xfffffffff4f0) at
/home/lijian/tasks/vpp.upstream/vpp/src/vppinfra/unformat.c:43
43 {
(gdb) n
46 if (i->index == UNFORMAT_END_OF_INPUT)
(gdb)
49 first_mark = l = vec_len (i->buffer);
(gdb)
50 if (vec_len (i->buffer_marks) > 0)
(gdb)
54 if (first_mark > 0)
(gdb)
57 i->index = vec_len (i->buffer);
(gdb)
58 for (l = 0; l < vec_len (i->buffer_marks); l++)
(gdb)
62 if (i->fill_buffer)
(gdb)
63 i->index = i->fill_buffer (i);
(gdb) s
clib_file_fill_buffer (input=0xfffffffff4f0) at
/home/lijian/tasks/vpp.upstream/vpp/src/vppinfra/unformat.c:1041
1041 {
(gdb) n
1042 int fd = pointer_to_uword (input->fill_buffer_arg);
(gdb)
1045 l = vec_len (input->buffer);
(gdb)
1046 vec_resize (input->buffer, 4096);
(gdb) p input->buffer
$2 = (u8 *) 0x0
(gdb) s
_vec_resize_inline (v=0x0, length_increment=4096, data_bytes=4096,
header_bytes=0, data_align=1) at
/home/lijian/tasks/vpp.upstream/vpp/src/vppinfra/vec.h:121
121 {
(gdb) n
122 vec_header_t *vh = _vec_find (v);
(gdb)
125 aligned_header_bytes = vec_header_bytes (header_bytes);
(gdb)
127 new_data_bytes = data_bytes + aligned_header_bytes;
(gdb) p aligned_header_bytes
$3 = 8
(gdb) n
129 if (PREDICT_TRUE (v != 0))
(gdb)
147 clib_max (sizeof (vec_header_t),
(gdb)
145 return vec_resize_allocate_memory (v, length_increment, data_bytes,
(gdb) s
vec_resize_allocate_memory (v=0x0, length_increment=4096, data_bytes=4096,
header_bytes=0, data_align=8) at
/home/lijian/tasks/vpp.upstream/vpp/src/vppinfra/vec.c:48
48 {
(gdb) n
49 vec_header_t *vh = _vec_find (v);
(gdb)
53 header_bytes = vec_header_bytes (header_bytes);
(gdb)
55 data_bytes += header_bytes;
(gdb)
57 if (!v)
(gdb)
59 new = clib_mem_alloc_aligned_at_offset (data_bytes, data_align,
header_bytes, 1 /* yes, call os_out_of_memory */
(gdb)
Program received signal SIGSEGV, Segmentation fault.
0x0000ffffbea52f24 in ok_magic (m=0x0) at
/home/lijian/tasks/vpp.upstream/vpp/src/vppinfra/dlmalloc.c:1618
1618 return (m->magic == mparams.magic);
(gdb)
Thanks.
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