From 994b25132814f4c2be93ce53a616a74139c4cf3c Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Sun, 17 Jan 2021 20:01:16 -0800 Subject: [PATCH] ld/elf: Ignore section symbols when matching linkonce with comdat When deciding if a single member comdat group section in file FOO should be discarded by a linkonce section in file BAR, we check if 2 sections define the same set of local and global symbols. When only one of the files doesn't contain the unused section symbols in the symbol table, such as object files generated by clang or GNU assembler with commit d1bcae833b32f1408485ce69f844dcd7ded093a8 Author: H.J. Lu Date: Thu Jan 7 06:42:00 2021 -0800 ELF: Don't generate unused section symbols the check will fail since one file has the extra unused section symbols. We should ignore both undefined and section symbols in the symbol table when making such a decision. bfd/ PR ld/27193 * elflink.c (elf_create_symbuf): Also ignore section symbols. ld/ PR ld/27193 * testsuite/ld-i386/i386.exp: Run PR ld/27193 test. * testsuite/ld-i386/pr27193.dd: New file. * testsuite/ld-i386/pr27193a.o.bz2: Likewise. * testsuite/ld-i386/pr27193b.s: Likewise. --- bfd/ChangeLog | 5 +++++ bfd/elflink.c | 6 +++++- ld/ChangeLog | 8 ++++++++ ld/testsuite/ld-i386/i386.exp | 5 +++++ ld/testsuite/ld-i386/pr27193.dd | 5 +++++ ld/testsuite/ld-i386/pr27193a.o.bz2 | Bin 0 -> 468 bytes ld/testsuite/ld-i386/pr27193b.s | 8 ++++++++ 7 files changed, 36 insertions(+), 1 deletion(-) create mode 100644 ld/testsuite/ld-i386/pr27193.dd create mode 100644 ld/testsuite/ld-i386/pr27193a.o.bz2 create mode 100644 ld/testsuite/ld-i386/pr27193b.s diff --git a/bfd/ChangeLog b/bfd/ChangeLog index dbb240ad612..b947c517202 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,8 @@ +2021-01-17 H.J. Lu + + PR ld/27193 + * elflink.c (elf_create_symbuf): Also ignore section symbols. + 2021-01-16 H.J. Lu PR ld/23169 diff --git a/bfd/elflink.c b/bfd/elflink.c index 8794864f54c..59a6080f37a 100644 --- a/bfd/elflink.c +++ b/bfd/elflink.c @@ -8126,8 +8126,12 @@ elf_create_symbuf (size_t symcount, Elf_Internal_Sym *isymbuf) if (indbuf == NULL) return NULL; + /* NB: When checking if 2 sections define the same set of local and + global symbols, ignore both undefined and section symbols in the + symbol table. */ for (ind = indbuf, i = 0; i < symcount; i++) - if (isymbuf[i].st_shndx != SHN_UNDEF) + if (isymbuf[i].st_shndx != SHN_UNDEF + && ELF_ST_TYPE (isymbuf[i].st_info) != STT_SECTION) *ind++ = &isymbuf[i]; indbufend = ind; diff --git a/ld/ChangeLog b/ld/ChangeLog index 6b602d60341..92fa8a4e1c3 100644 --- a/ld/ChangeLog +++ b/ld/ChangeLog @@ -1,3 +1,11 @@ +2021-01-17 H.J. Lu + + PR ld/27193 + * testsuite/ld-i386/i386.exp: Run PR ld/27193 test. + * testsuite/ld-i386/pr27193.dd: New file. + * testsuite/ld-i386/pr27193a.o.bz2: Likewise. + * testsuite/ld-i386/pr27193b.s: Likewise. + 2021-01-16 H.J. Lu PR binutils/23460 diff --git a/ld/testsuite/ld-i386/i386.exp b/ld/testsuite/ld-i386/i386.exp index f3e62a4151e..0be6b861dab 100644 --- a/ld/testsuite/ld-i386/i386.exp +++ b/ld/testsuite/ld-i386/i386.exp @@ -245,6 +245,11 @@ set i386tests { "-melf_i386 -shared -Bsymbolic -z notext" "" "--32 -mx86-used-note=yes" { pr19827a.S } {{readelf {-rW} pr19827.rd}} "pr19827.so"} + {"Build pr27193.so" + "-melf_i386 -shared" "" + "--32" + { pr27193a.o.bz2 pr27193b.s } + {{objdump {-dw} pr27193.dd}} "pr27193.so"} } proc iamcu_tests {} { diff --git a/ld/testsuite/ld-i386/pr27193.dd b/ld/testsuite/ld-i386/pr27193.dd new file mode 100644 index 00000000000..7d1e7993de0 --- /dev/null +++ b/ld/testsuite/ld-i386/pr27193.dd @@ -0,0 +1,5 @@ +#... +0+[a-f0-9]+ <__x86.get_pc_thunk.bx>: + +[a-f0-9]+: 8b 1c 24 mov \(%esp\),%ebx + +[a-f0-9]+: c3 ret +#pass diff --git a/ld/testsuite/ld-i386/pr27193a.o.bz2 b/ld/testsuite/ld-i386/pr27193a.o.bz2 new file mode 100644 index 0000000000000000000000000000000000000000..365899db9d58abcbf8e737299a223aa50407e56e GIT binary patch literal 468 zcmV;_0W1DOT4*^jL0KkKS7Ojs*Yj-(ac?00aO8NB}?p z07L);umN?0FiMDRP)(@xo=Q$~O=OpJpd0QDcL15-w$6vQW@8fm6zMw%K7 zO${1kWE&*WkPH$elx;xC>SzrO00000XaE3c271PG$qOd15}`;w09K>j+GS?(Fg#Et zDNC=zt1iM9j(#fpHutck6^9(wuN%UFEJX~>q?`!grAZvpt!xM?N04{%VPev9Rh<;7 zUKa6bTf!1SCXx%Wr9|;FB+_+a8n(uU(rqUwNFj!cI+`RoG$I&-OI8I#7FCLcx0YWy zNwjNC7QEylt>aFK1=~fNJU=;d80-kx)5neGUdINGJ6V|H(C(9{-EQ@0$wK{;p z9U?j}VfvWtt4mrVUa1iKkS+2QpgKVLQUQj7YWf^96L{9bCbVlhJBFXCd{^?n#oUoj K6eKf#s&2sVqr?CJ literal 0 HcmV?d00001 diff --git a/ld/testsuite/ld-i386/pr27193b.s b/ld/testsuite/ld-i386/pr27193b.s new file mode 100644 index 00000000000..9b27a6f7631 --- /dev/null +++ b/ld/testsuite/ld-i386/pr27193b.s @@ -0,0 +1,8 @@ + .section .text.__x86.get_pc_thunk.bx,"axG",%progbits,__x86.get_pc_thunk.bx,comdat + .globl __x86.get_pc_thunk.bx + .hidden __x86.get_pc_thunk.bx + .type __x86.get_pc_thunk.bx, %function + .p2align 4 +__x86.get_pc_thunk.bx: + mov (%esp),%ebx + ret -- 2.30.2