NAME
sym - translate a symbol to its virtual address, or vice-versa
SYNOPSIS
sym [-l] | [-M] | [-m module] | [-p|-n] | [-q string] | [symbol | vaddr]
DESCRIPTION
This command translates a symbol to its virtual address, or a static
kernel virtual address to its symbol -- or to a symbol-plus-offset value,
if appropriate. Additionally, the symbol type is shown in parentheses,
and if the symbol is a known text value, the file and line number are shown.
-l dumps all symbols and their values.
-M dumps the current set of module symbols.
-m module dumps the current set of symbols for a specified module.
-p display the target symbol and the previous symbol.
-n display the target symbol and the next symbol.
-q string searches for all symbols containing "string".
symbol a kernel text or data symbol.
vaddr a kernel virtual address.
If the "symbol", "vaddr" or "string" argument resolves to a module
symbol, then the module name will be displayed in brackets following the
symbol value.
EXAMPLES
Translate data symbol jiffies to its value, and vice-versa:
crash> sym jiffies
c0213ae0 (D) jiffies
crash> sym c0213ae0
c0213ae0 (D) jiffies
Translate a text address to its symbolic value and source file:
crash> sym c0109944
c0109944 (T) system_call+0x34 ../linux-2.2.5/arch/i386/kernel/signal.c: 723
Dump the whole symbol table:
crash> sym -l
c0100000 (T) _stext
c0100000 (A) _text
c0100000 (t) startup_32
c0100000 (T) stext
c01000a4 (t) checkCPUtype
c0100139 (t) is486
c0100148 (t) is386
c01001b1 (t) L6
c01001b3 (t) ready
c01001b4 (t) check_x87
c01001da (t) setup_idt
c01001f7 (t) rp_sidt
c0100204 (T) stack_start
c010020c (t) int_msg
c0100220 (t) ignore_int
c0100242 (t) idt_descr
c0100244 (T) idt
c010024a (t) gdt_descr
c010024c (T) gdt
c0101000 (T) swapper_pg_dir
c0102000 (T) pg0
c0103000 (T) empty_bad_page
c0104000 (T) empty_bad_page_table
c0105000 (T) empty_zero_page
...
Find all symbols containing the string "pipe":
crash> sym -q pipe
c010ec60 (T) sys_pipe
c012f660 (t) pipe_read
c012f7b8 (t) pipe_write
c012f9c0 (t) pipe_lseek
c012f9d0 (t) bad_pipe_r
c012f9dc (t) bad_pipe_w
c012f9e8 (t) pipe_ioctl
c012fa18 (t) pipe_poll
c012fb00 (t) pipe_release
c012fb48 (t) pipe_read_release
c012fb5c (t) pipe_write_release
c012fb70 (t) pipe_rdwr_release
c012fba0 (t) pipe_read_open
c012fbb0 (t) pipe_write_open
c012fbc0 (t) pipe_rdwr_open
c012fbec (t) get_pipe_inode
c012fcc4 (T) do_pipe
c023a920 (D) read_pipe_fops
c023a960 (D) write_pipe_fops
c023a9a0 (D) rdwr_pipe_fops
c023a9e0 (D) pipe_inode_operations
Dump the symbols of the uart401 module, both before, and then after,
the complete set of symbols are loaded with the "mod -s" command:
crash> sym -m uart401
c8032000 MODULE START: uart401
c8032138 (?) uart401intr
c803235c (?) attach_uart401
c8032638 (?) probe_uart401
c80326d4 (?) unload_uart401
c8033770 MODULE END: uart401
crash> mod -s uart401
MODULE NAME SIZE OBJECT FILE
c8032000 uart401 6000 /lib/modules/2.2.14/misc/uart401.o
crash> sym -m uart401
c8032000 MODULE START: uart401
c8032050 (t) my_notifier_call
c8032084 (t) uart401_status
c8032098 (t) uart401_cmd
c80320a8 (t) uart401_read
c80320bc (t) uart401_write
c80320cc (t) uart401_input_loop
c8032138 (T) uart401intr
c8032168 (t) uart401_open
c80321c8 (t) uart401_close
c80321f4 (t) uart401_out
c80322ac (t) uart401_start_read
c80322b4 (t) uart401_end_read
c80322bc (t) uart401_kick
c80322c4 (t) uart401_buffer_status
c80322cc (t) enter_uart_mode
c803235c (T) attach_uart401
c803259c (t) reset_uart401
c8032638 (T) probe_uart401
c80326d4 (T) unload_uart401
c8032760 (T) init_module
c80327cc (T) cleanup_module
c8032b00 (d) sound_notifier
c8032b0c (d) detected_devc
c8032b20 (d) std_synth_info
c8032bc0 (d) std_midi_synth
c8033600 (d) uart401_operations
c80336c4 (D) io
c80336c8 (D) irq
c80336e0 (b) hw_info.508
c8033770 MODULE END: uart401
Display the value of jiffies, along with the next and previous symbols:
crash> sym -np jiffies
c023027c (D) prof_shift
c0230280 (D) jiffies
c02302a0 (D) task
Translate a symbol value to its name and module:
crash> sym f88878d1
f88878d1 (t) ext3_readdir [ext3]
crash>
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