At Tue, 12 Apr 2005 12:43:34 +0100,
Paulo Marques wrote:
>
> Yoshinori Sato wrote:
> > kallsyms does not consider SYMBOL_PREFIX of C.
> > Consequently do not work in architecture using prefix character (h8300, v850) really.
> >
> > Because I can want to use this, I made a patch.
> > Please comment.
> >
> > [...]
>
> > @@ -177,6 +184,11 @@
> > "_SDA2_BASE_", /* ppc */
> > NULL };
> > int i;
> > + int offset = 1;
> > +
> > + /* skip prefix char */
> > + if (symbol_prefix_char && *(s->sym + 1) == symbol_prefix_char)
> > + offset++;
>
> maybe something like:
>
> char *sname;
> sname = s->sym + 1;
> if (symbol_prefix_char && *(s->sym + 1) == symbol_prefix_char)
> sname++;
>
> would avoid all the "(s->sym + offset)" below, turning them to just "sname".
>
> I know that it was "(s->sym + 1)" before, so its really not your fault,
> but you could take this opportunity to clean that up, too.
This one is fine.
> >
> > /* if --all-symbols is not specified, then symbols outside the text
> > * and inittext sections are discarded */
> > @@ -190,17 +202,17 @@
> > * they may get dropped in pass 2, which breaks the kallsyms
> > * rules.
> > */
> > - if ((s->addr == _etext && strcmp(s->sym + 1, "_etext")) ||
> > - (s->addr == _einittext && strcmp(s->sym + 1, "_einittext")))
> > + if ((s->addr == _etext && strcmp(s->sym + offset, "_etext")) ||
> > + (s->addr == _einittext && strcmp(s->sym + offset, "_einittext")))
> > return 0;
> > }
> >
> > /* Exclude symbols which vary between passes. */
> > - if (strstr(s->sym + 1, "_compiled."))
> > + if (strstr(s->sym + offset, "_compiled."))
> > return 0;
> >
> > for (i = 0; special_symbols[i]; i++)
> > - if( strcmp(s->sym + 1, special_symbols[i]) == 0 )
> > + if( strcmp(s->sym + offset, special_symbols[i]) == 0 )
> > return 0;
> >
> > return 1;
> > @@ -225,9 +237,15 @@
>
> > [...]
> >
> > /* uncompress a compressed symbol. When this function is called, the best table
> > @@ -665,6 +683,13 @@
> >
> > insert_real_symbols_in_table();
> >
> > + /* When valid symbol is not registered, exit to error */
> > + if (good_head.left == good_head.right &&
> > + bad_head.left == bad_head.right) {
> > + fprintf(stderr, "No valid symbol.\n");
> > + exit(1);
> > + }
> > +
> > optimize_result();
> > }
>
> This should only trigger if there are no symbols at all, or if there are
> some symbols that are considered invalid, and do not go into the final
> result.
>
> Maybe we should just do a return here instead of exit, so that even if
> this happens, kallsyms will still produce an empty result, that will at
> least allow the kernel to compile.
>
> It should give the error output to warn the user that there is something
> fishy, nevertheless. Maybe even a bigger message, since this should not
> happen at all, and if this triggers it means that something is seriously
> wrong.
Not surely possible normally.
But raise SEGV if there is not a check. I do not think that this is good action.
> > @@ -672,9 +697,21 @@
> > int
> > main(int argc, char **argv)
> > {
> > - if (argc == 2 && strcmp(argv[1], "--all-symbols") == 0)
> > - all_symbols = 1;
> > - else if (argc != 1)
> > + if (argc >= 2) {
>
> This test is unnecessary.
>
> > + int i;
> > + for (i = 1; i < argc; i++) {
> > + if(strcmp(argv[i], "--all-symbols") == 0)
> > + all_symbols = 1;
> > + else if (strncmp(argv[i], "--symbol-prefix=", 16) == 0) {
> > + char *p = &argv[i][16];
> > + /* skip quote */
> > + if ((*p == '"' && *(p+2) == '"') || (*p == '\'' && *(p+2) == '\''))
> > + p++;
> > + symbol_prefix_char = *p;
> > + } else
> > + usage();
> > + }
> > + } else if (argc != 1)
> > usage();
>
> and so is this.
>
> >
> > read_map(stdin);
> > @@ -683,4 +720,3 @@
> >
> > return 0;
> > }
>
> At least the patch seems to not affect architectures that don't use the
> "--symbol-prefix" option, so it should be harmless for most.
I think of the same thread which are an issue with it being worked if do not appoint "--symbol-prefix".
Use CONFIG_ARCH and may judge it, but will it be good to refer to include/linux here?
> Anyway, appart from the few comments, it has my acknowledge.
>
> --
> Paulo Marques - www.grupopie.com
>
> All that is necessary for the triumph of evil is that good men do nothing.
> Edmund Burke (1729 - 1797)
--
Yoshinori Sato
<[email protected]>
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