lld/test/ELF/pack-dyn-relocs-glibc.s

   1 # REQUIRES: x86
   2 ## -z pack-relative-relocs is a variant of --pack-dyn-relocs=relr: add
   3 ## GLIBC_ABI_DT_RELR verneed if there is a verneed named "GLIBC_2.*".
   4
   5 # RUN: rm -rf %t && split-file %s %t
   6 # RUN: llvm-mc -filetype=obj -triple=x86_64 %t/a.s -o %t/a.o
   7 # RUN: llvm-mc -filetype=obj -triple=x86_64 %t/libc.s -o %t/libc.o
   8 # RUN: ld.lld -shared --soname=libc.so.6 --version-script=%t/glibc.ver %t/libc.o -o %t/libc.so.6
   9
  10 # RUN: ld.lld -pie %t/a.o %t/libc.so.6 -z pack-relative-relocs -o %t/glibc 2>&1 | count 0
  11 # RUN: llvm-readelf -r -V %t/glibc | FileCheck %s --check-prefix=GLIBC
  12 ## Arbitrarily let -z pack-relative-relocs win.
  13 # RUN: ld.lld -pie %t/a.o %t/libc.so.6 -z pack-relative-relocs --pack-dyn-relocs=relr -o %t/glibc2
  14 # RUN: cmp %t/glibc %t/glibc2
  15
  16 # GLIBC:      Relocation section '.relr.dyn' at offset {{.*}} contains 1 entries:
  17 # GLIBC:      Version needs section '.gnu.version_r' contains 1 entries:
  18 # GLIBC-NEXT:  Addr: {{.*}}
  19 # GLIBC-NEXT:   0x0000: Version: 1  File: libc.so.6  Cnt: 2
  20 # GLIBC-NEXT:   0x0010:   Name: GLIBC_2.33  Flags: none  Version: 2
  21 # GLIBC-NEXT:   0x0020:   Name: GLIBC_ABI_DT_RELR  Flags: none  Version: 3
  22 # GLIBC-EMPTY:
  23
  24 # RUN: ld.lld -pie %t/a.o %t/libc.so.6 -z pack-relative-relocs -z nopack-relative-relocs -o %t/notrelr 2>&1 | count 0
  25 # RUN: llvm-readelf -r -V %t/notrelr | FileCheck %s --check-prefix=REGULAR
  26
  27 # REGULAR-NOT: Relocation section '.relr.dyn'
  28 # REGULAR-NOT: Name: GLIBC_ABI_DT_RELR
  29
  30 ## soname is not "libc.so.*". Don't synthesize GLIBC_ABI_DT_RELR. In glibc, ld.so
  31 ## doesn't define GLIBC_ABI_DT_RELR. libc.so itself should not reference GLIBC_ABI_DT_RELR.
  32 # RUN: ld.lld -shared --soname=ld-linux-x86-64.so.2 --version-script=%t/glibc.ver %t/libc.o -o %t/ld.so
  33 # RUN: ld.lld -pie %t/a.o %t/ld.so -z pack-relative-relocs -o %t/other 2>&1 | count 0
  34 # RUN: llvm-readelf -r -V %t/other | FileCheck %s --check-prefix=NOTLIBC
  35
  36 # NOTLIBC:     Relocation section '.relr.dyn' at offset {{.*}} contains 1 entries:
  37 # NOTLIBC-NOT: Name: GLIBC_ABI_DT_RELR
  38
  39 ## There is no GLIBC_2.* verneed. Don't add GLIBC_ABI_DT_RELR verneed.
  40 # RUN: ld.lld -shared --soname=libc.so.6 --version-script=%t/other.ver %t/libc.o -o %t/libc.so.6
  41 # RUN: ld.lld -pie %t/a.o %t/libc.so.6 -z pack-relative-relocs -o %t/other
  42 # RUN: llvm-readelf -r -V %t/other | FileCheck %s --check-prefix=NOTLIBC
  43
  44 #--- a.s
  45 .globl _start
  46 _start:
  47   call stat
  48
  49 .data
  50 .balign 8
  51 .dc.a .data
  52
  53 #--- libc.s
  54 .weak stat
  55 stat:
  56
  57 #--- glibc.ver
  58 GLIBC_2.33 {
  59   stat;
  60 };
  61
  62 #--- other.ver
  63 GLIBC_3 {
  64   stat;
  65 };