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ftrace/recordmcount: Add helper function get_sym_str_and_relp() 

The code to get the symbol, string, and relp pointers in the two functions
sift_rel_mcount() and nop_mcount() are identical and also non-trivial.
Moving this duplicate code into a single helper function makes the code
easier to read and more maintainable.

Cc: John Reiser <jreiser@bitwagon.com>
Link: http://lkml.kernel.org/r/20110421023739.723658553@goodmis.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2011-04-20 21:13:06 -04:00 committed by Steven Rostedt
parent 37762cb997
commit 41b402a201
1 changed files with 37 additions and 30 deletions
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67
scripts/recordmcount.h
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@ -29,6 +29,7 @@
#undef has_rel_mcount
#undef tot_relsize
#undef get_mcountsym
#undef get_sym_str_and_relp
#undef do_func
#undef Elf_Addr
#undef Elf_Ehdr
@ -56,6 +57,7 @@
# define __has_rel_mcount __has64_rel_mcount
# define has_rel_mcount has64_rel_mcount
# define tot_relsize tot64_relsize
# define get_sym_str_and_relp get_sym_str_and_relp_64
# define do_func do64
# define get_mcountsym get_mcountsym_64
# define is_fake_mcount is_fake_mcount64
@ -86,6 +88,7 @@
# define __has_rel_mcount __has32_rel_mcount
# define has_rel_mcount has32_rel_mcount
# define tot_relsize tot32_relsize
# define get_sym_str_and_relp get_sym_str_and_relp_32
# define do_func do32
# define get_mcountsym get_mcountsym_32
# define is_fake_mcount is_fake_mcount32
@ -260,6 +263,29 @@ static unsigned get_mcountsym(Elf_Sym const *const sym0,
return mcountsym;
}
static void get_sym_str_and_relp(Elf_Shdr const *const relhdr,
Elf_Ehdr const *const ehdr,
Elf_Sym const **sym0,
char const **str0,
Elf_Rel const **relp)
{
Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff)
+ (void *)ehdr);
unsigned const symsec_sh_link = w(relhdr->sh_link);
Elf_Shdr const *const symsec = &shdr0[symsec_sh_link];
Elf_Shdr const *const strsec = &shdr0[w(symsec->sh_link)];
Elf_Rel const *const rel0 = (Elf_Rel const *)(_w(relhdr->sh_offset)
+ (void *)ehdr);
*sym0 = (Elf_Sym const *)(_w(symsec->sh_offset)
+ (void *)ehdr);
*str0 = (char const *)(_w(strsec->sh_offset)
+ (void *)ehdr);
*relp = rel0;
}
/*
* Look at the relocations in order to find the calls to mcount.
* Accumulate the section offsets that are found, and their relocation info,
@ -276,26 +302,16 @@ static uint_t *sift_rel_mcount(uint_t *mlocp,
{
uint_t *const mloc0 = mlocp;
Elf_Rel *mrelp = *mrelpp;
Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff)
+ (void *)ehdr);
unsigned const symsec_sh_link = w(relhdr->sh_link);
Elf_Shdr const *const symsec = &shdr0[symsec_sh_link];
Elf_Sym const *const sym0 = (Elf_Sym const *)(_w(symsec->sh_offset)
+ (void *)ehdr);
Elf_Shdr const *const strsec = &shdr0[w(symsec->sh_link)];
char const *const str0 = (char const *)(_w(strsec->sh_offset)
+ (void *)ehdr);
Elf_Rel const *const rel0 = (Elf_Rel const *)(_w(relhdr->sh_offset)
+ (void *)ehdr);
Elf_Sym const *sym0;
char const *str0;
Elf_Rel const *relp;
unsigned rel_entsize = _w(relhdr->sh_entsize);
unsigned const nrel = _w(relhdr->sh_size) / rel_entsize;
Elf_Rel const *relp = rel0;
unsigned mcountsym = 0;
unsigned t;
get_sym_str_and_relp(relhdr, ehdr, &sym0, &str0, &relp);
for (t = nrel; t; --t) {
if (!mcountsym)
mcountsym = get_mcountsym(sym0, relp, str0);
@ -331,27 +347,18 @@ static void nop_mcount(Elf_Shdr const *const relhdr,
{
Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff)
+ (void *)ehdr);
unsigned const symsec_sh_link = w(relhdr->sh_link);
Elf_Shdr const *const symsec = &shdr0[symsec_sh_link];
Elf_Sym const *const sym0 = (Elf_Sym const *)(_w(symsec->sh_offset)
+ (void *)ehdr);
Elf_Shdr const *const strsec = &shdr0[w(symsec->sh_link)];
char const *const str0 = (char const *)(_w(strsec->sh_offset)
+ (void *)ehdr);
Elf_Rel const *const rel0 = (Elf_Rel const *)(_w(relhdr->sh_offset)
+ (void *)ehdr);
Elf_Sym const *sym0;
char const *str0;
Elf_Rel const *relp;
Elf_Shdr const *const shdr = &shdr0[w(relhdr->sh_info)];
unsigned rel_entsize = _w(relhdr->sh_entsize);
unsigned const nrel = _w(relhdr->sh_size) / rel_entsize;
Elf_Rel const *relp = rel0;
Elf_Shdr const *const shdr = &shdr0[w(relhdr->sh_info)];
unsigned mcountsym = 0;
unsigned t;
int once = 0;
get_sym_str_and_relp(relhdr, ehdr, &sym0, &str0, &relp);
for (t = nrel; t; --t) {
int ret = -1;