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don't call null pointer if DT_INIT/DT_FINI are null

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it's not clear to me why the linker even outputs these headers if they
are null, but apparently it does so. with the default startfiles, they
will never be null anyway, but this patch allows eliminating crti,
crtn, crtbegin, and crtend (leaving only crt1) if the toolchain is
using init_array/fini_array (or for a C-only, no-ctor environment).
This commit is contained in:
Rich Felker 2013-07-31 00:04:10 -04:00
parent 9a8d7bee80
commit d0c6cb05e7
1 changed files with 2 additions and 2 deletions
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4
src/ldso/dynlink.c
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@ -715,7 +715,7 @@ static void do_fini()
while (n--) ((void (*)(void))*--fn)();
}
#ifndef NO_LEGACY_INITFINI
if (dyn[0] & (1<<DT_FINI))
if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI])
((void (*)(void))(p->base + dyn[DT_FINI]))();
#endif
}
@ -738,7 +738,7 @@ static void do_init_fini(struct dso *p)
fini_head = p;
}
#ifndef NO_LEGACY_INITFINI
if (dyn[0] & (1<<DT_INIT))
if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT])
((void (*)(void))(p->base + dyn[DT_INIT]))();
#endif
if (dyn[0] & (1<<DT_INIT_ARRAY)) {