[PATCH] D112582: [ELF] Implement General Dynamic style TLSDESC for x86-32

[Fangrui Song via Phabricator via llvm-commits]

MaskRay created this revision.
MaskRay added reviewers: arichardson, zatrazz.
Herald added a subscriber: emaste.
MaskRay requested review of this revision.
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Tested with:

  cat > ./a.c <<eof
  #include <stdio.h>
  
  int foo();
  
  int main() {
    printf("%d\n", foo());
    printf("%d\n", foo());
    printf("%d\n", foo());
  }
  eof
  cat > ./b.c <<eof
  #include <stdio.h>
  
  __thread int tls0;
  extern __thread int tls1;
  int foo() { return ++tls0 + ++tls1; }
  eof
  echo '__thread int tls1;' > ./c.c
  sed 's/        /\t/' > ./Makefile <<'eof'
  .MAKE.MODE = meta curDirOk=true
  
  CC := gcc -m32 -g -fpic -mtls-dialect=gnu2
  LDFLAGS := -m32 -Wl,-rpath=.
  
  all: a0 a1 a2
  
  run: all
          ./a0 && ./a1 && ./a2
  
  c.so: c.o; ${LINK.c} -shared $> -o $@
  bc.so: b.o c.o; ${LINK.c} -shared $> -o $@
  b.so: b.o c.so; ${LINK.c} -shared $> -o $@
  
  a0: a.o b.o c.o; ${LINK.c} $> -o $@
  a1: a.o b.so; ${LINK.c} $> -o $@
  a2: a.o bc.so; ${LINK.c} $> -o $@
  eof

`/usr/local/bin/ld` points to the freshly built `lld`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D112582

Files:
  lld/ELF/Arch/X86.cpp
  lld/ELF/InputSection.cpp
  lld/ELF/Relocations.cpp
  lld/ELF/Relocations.h
  lld/test/ELF/i386-tlsdesc-gd.s

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