Date: Fri, 16 Jul 2021 02:42:26 GMT From: Mark Johnston <markj@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: f238ebd14293 - main - rtld/arm64: Remove checks for undefined symbols when processing TPREL64 Message-ID: <202107160242.16G2gQwI080477@gitrepo.freebsd.org>
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The branch main has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=f238ebd1429312ac2a4cb9f764babc4b6f69721e commit f238ebd1429312ac2a4cb9f764babc4b6f69721e Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2021-07-16 02:26:25 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2021-07-16 02:41:10 +0000 rtld/arm64: Remove checks for undefined symbols when processing TPREL64 lld emits several GOT relocations referencing the null sumbol in libc.so when compiled with -ftls-model=initial-exec. This symbol is specified to be undefined. We generally do not handle dynamic TLS relocations against weak, undefined symbols, so avoid printing a warning here. This makes it possible to compile libc.so using the initial-exec TLS model on arm64. Reviewed by: jrtc27, kib MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D31069 --- libexec/rtld-elf/aarch64/reloc.c | 21 ++------------------- 1 file changed, 2 insertions(+), 19 deletions(-) diff --git a/libexec/rtld-elf/aarch64/reloc.c b/libexec/rtld-elf/aarch64/reloc.c index 8d9c23a41aa5..8cc66c87d698 100644 --- a/libexec/rtld-elf/aarch64/reloc.c +++ b/libexec/rtld-elf/aarch64/reloc.c @@ -479,25 +479,8 @@ reloc_non_plt(Obj_Entry *obj, Obj_Entry *obj_rtld, int flags, return (-1); } } - /* Test weak undefined thread variable */ - if (def->st_shndx != SHN_UNDEF) { - *where = def->st_value + rela->r_addend + - defobj->tlsoffset; - } else { - /* - * XXX We should relocate undefined thread - * weak variable address to NULL, but how? - * Can we return error in this situation? - */ - rtld_printf("%s: Unable to relocate undefined " - "weak TLS variable\n", obj->path); -#if 0 - return (-1); -#else - *where = def->st_value + rela->r_addend + - defobj->tlsoffset; -#endif - } + *where = def->st_value + rela->r_addend + + defobj->tlsoffset; break; /*
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