----- Original Message -----
> Notify the user if there is more than one symbol of the given target.
>
> For example, after this patch:
>
> - The 'dis' command now reports that more than one symbol of "watchdog"
> exists, to allow the user to be more specific
>
> crash> dis watchdog
> duplicate symbols found: watchdog
> ffffffff810e6100 (t) watchdog
>
> /usr/src/debug/kernel-2.6.32-431.1.2.el6/linux-2.6.32-431.1.2.el6.x86_64/kernel/hung_task.c:
> 199
> ffffffff810e6990 (t) watchdog
>
> /usr/src/debug/kernel-2.6.32-431.1.2.el6/linux-2.6.32-431.1.2.el6.x86_64/kernel/watchdog.c:
> 332
> ffffffff81eb3fc8 (b) watchdog
>
> - Choose to disassemble the watchdog() function defined in
> kernel/watchdog.c by using the address of the first function
>
> crash> dis ffffffff810e6990
> 0xffffffff810e6990 <watchdog>: push %rbp
> 0xffffffff810e6991 <watchdog+1>: mov %rsp,%rbp
> 0xffffffff810e6994 <watchdog+4>: push %r13
> 0xffffffff810e699d <watchdog+13>: nopl 0x0(%rax,%rax,1)
> ...
>
> Signed-off-by: Aaron Tomlin <[email protected]>
Hi Aaron,
Good plan.
But is there any particular reason for adding "show_flags"? Since the symbol
passed to show_symbol() will never have an offset, it doesn't make any
difference
to save and use the incoming radix, as opposed to the -x|d override, or for that
matter, nothing.
Dave
> ---
> defs.h | 1 +
> kernel.c | 28 ++++++++++++++++++++++++----
> symbols.c | 3 +--
> 3 files changed, 26 insertions(+), 6 deletions(-)
>
> diff --git a/defs.h b/defs.h
> index f21137d..26aa963 100644
> --- a/defs.h
> +++ b/defs.h
> @@ -4585,6 +4585,7 @@ void show_symbol(struct syment *, ulong, ulong);
> #define SHOW_DEC_OFFS (0x8)
> #define SHOW_RADIX() (*gdb_output_radix == 16 ? SHOW_HEX_OFFS :
> SHOW_DEC_OFFS)
> #define SHOW_MODULE (0x10)
> +int symbol_name_count(char *);
> int symbol_query(char *, char *, struct syment **);
> struct syment *next_symbol(char *, struct syment *);
> struct syment *prev_symbol(char *, struct syment *);
> diff --git a/kernel.c b/kernel.c
> index 628779c..b87d9ec 100644
> --- a/kernel.c
> +++ b/kernel.c
> @@ -1339,6 +1339,7 @@ cmd_dis(void)
> ulong revtarget;
> ulong count;
> ulong offset;
> + ulong show_flags;
> struct syment *sp;
> struct gnu_request *req;
> char *savename;
> @@ -1362,6 +1363,7 @@ cmd_dis(void)
> sp = NULL;
> unfiltered = user_mode = do_machdep_filter = do_load_module_filter = 0;
> radix = 0;
> + show_flags = SHOW_LINENUM | SHOW_RADIX();
>
> req = (struct gnu_request *)getbuf(sizeof(struct gnu_request));
> req->buf = GETBUF(BUFSIZE);
> @@ -1425,7 +1427,28 @@ cmd_dis(void)
> radix = pc->output_radix;
>
> if (args[optind]) {
> - if (can_eval(args[optind]))
> + if ((sp = symbol_search(args[optind])) &&
> + ((symbol_name_count(sp->name)) > 1)) {
> + fprintf(fp, "duplicate symbols found: %s\n",
> + args[optind]);
> +
> + do {
> + if (module_symbol(sp->value, NULL, NULL,
> + NULL, 0))
> + show_symbol(sp, 0,
> show_flags|SHOW_MODULE);
> + else
> + show_symbol(sp, 0, show_flags);
> +
> + } while ((sp = symbol_search_next(sp->name, sp)));
> +
> + FREEBUF(req->buf);
> + FREEBUF(req);
> + return;
> + }
> + if (sp) {
> + req->addr = sp->value;
> + req->flags |= GNU_FUNCTION_ONLY;
> + } else if (can_eval(args[optind]))
> req->addr = eval(args[optind], FAULT_ON_ERROR,
> NULL);
> else if (hexadecimal(args[optind], 0)) {
> req->addr = htol(args[optind], FAULT_ON_ERROR,
> NULL);
> @@ -1438,9 +1461,6 @@ cmd_dis(void)
> }
> if (!offset)
> req->flags |= GNU_FUNCTION_ONLY;
> - } else if ((sp = symbol_search(args[optind]))) {
> - req->addr = sp->value;
> - req->flags |= GNU_FUNCTION_ONLY;
> } else {
> fprintf(fp, "symbol not found: %s\n", args[optind]);
> fprintf(fp, "possible alternatives:\n");
> diff --git a/symbols.c b/symbols.c
> index 48d9f58..958181a 100644
> --- a/symbols.c
> +++ b/symbols.c
> @@ -37,7 +37,6 @@ static asection *get_kernel_section(char *);
> static char * get_section(ulong vaddr, char *buf);
> static void symbol_dump(ulong, char *);
> static void check_for_dups(struct load_module *);
> -static int symbol_name_count(char *);
> static struct syment *kallsyms_module_symbol(struct load_module *,
> symbol_info *);
> static void store_load_module_symbols \
> (bfd *, int, void *, long, uint, ulong, char *);
> @@ -4156,7 +4155,7 @@ symbol_search(char *s)
> /*
> * Count the number of instances of a symbol name.
> */
> -static int
> +int
> symbol_name_count(char *s)
> {
> int i;
> --
> 2.4.3
>
> --
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>
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