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Consolidate link map sorting

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Combine the four places where link maps are sorted into a single function.
This also moves the logic to skip the first map (representing the main
binary) to the callers.
This commit is contained in:
Andreas Schwab
2017-11-07 15:24:19 +01:00
parent de61465c04
commit c2c299fd24
8 changed files with 153 additions and 215 deletions
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57
elf/dl-open.c
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@ -311,7 +311,7 @@ dl_open_worker (void *a)
/* Sort the objects by dependency for the relocation process. This
allows IFUNC relocations to work and it also means copy
relocation of dependencies are if necessary overwritten. */
size_t nmaps = 0;
unsigned int nmaps = 0;
struct link_map *l = new;
do
{
@ -330,62 +330,11 @@ dl_open_worker (void *a)
l = l->l_next;
}
while (l != NULL);
if (nmaps > 1)
{
uint16_t seen[nmaps];
memset (seen, '\0', sizeof (seen));
size_t i = 0;
while (1)
{
++seen[i];
struct link_map *thisp = maps[i];
/* Find the last object in the list for which the current one is
a dependency and move the current object behind the object
with the dependency. */
size_t k = nmaps - 1;
while (k > i)
{
struct link_map **runp = maps[k]->l_initfini;
if (runp != NULL)
/* Look through the dependencies of the object. */
while (*runp != NULL)
if (__glibc_unlikely (*runp++ == thisp))
{
/* Move the current object to the back past the last
object with it as the dependency. */
memmove (&maps[i], &maps[i + 1],
(k - i) * sizeof (maps[0]));
maps[k] = thisp;
if (seen[i + 1] > nmaps - i)
{
++i;
goto next_clear;
}
uint16_t this_seen = seen[i];
memmove (&seen[i], &seen[i + 1],
(k - i) * sizeof (seen[0]));
seen[k] = this_seen;
goto next;
}
--k;
}
if (++i == nmaps)
break;
next_clear:
memset (&seen[i], 0, (nmaps - i) * sizeof (seen[0]));
next:;
}
}
_dl_sort_maps (maps, nmaps, NULL, false);
int relocation_in_progress = 0;
for (size_t i = nmaps; i-- > 0; )
for (unsigned int i = nmaps; i-- > 0; )
{
l = maps[i];