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Explain some reloc hackery

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just changes a comment; it's not specific to __dso_handle, but general
to all hidden defined symbols for shared libraries.
This commit is contained in:
Michael Matz 2020-12-31 00:46:23 +01:00
parent 60eac659d4
commit b117088a91
1 changed files with 3 additions and 1 deletions
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tccelf.c
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@ -1048,7 +1048,9 @@ static int prepare_dynamic_rel(TCCState *s1, Section *sr)
{ {
ElfW(Sym) *sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; ElfW(Sym) *sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
/* support __dso_handle in atexit() */ /* Hidden defined symbols can and must be resolved locally.
We're misusing a PLT32 reloc for this, as that's always
resolved to its address even in shared libs. */
if (sym->st_shndx != SHN_UNDEF && if (sym->st_shndx != SHN_UNDEF &&
ELFW(ST_VISIBILITY)(sym->st_other) == STV_HIDDEN) { ELFW(ST_VISIBILITY)(sym->st_other) == STV_HIDDEN) {
rel->r_info = ELFW(R_INFO)(sym_index, R_X86_64_PLT32); rel->r_info = ELFW(R_INFO)(sym_index, R_X86_64_PLT32);