[Bug ld/32131] New: Linker should always check TLS relocation

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=32131

            Bug ID: 32131
           Summary: Linker should always check TLS relocation
           Product: binutils
           Version: 2.44 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---
            Target: i386, x86-64

[hjl@gnu-cfl-3 tls-3]$ vi tls-main1.c 
[hjl@gnu-cfl-3 tls-3]$ make
gcc -B./ -m32 -O2 -g -mtls-dialect=gnu2   -c -o tls-main1.o tls-main1.c
gcc -B./ -m32 -o x tls-main1.o tls-gd1.o
tls-gd1.o: TLS transition from R_386_TLS_GD to R_386_TLS_IE_32 against `gd' at
0x12 in section `.text' failed
./ld: failed to set dynamic section sizes: bad value
collect2: error: ld returned 1 exit status
make: *** [Makefile:24: x] Error 1
[hjl@gnu-cfl-3 tls-3]$ make clean
rm -f *.o foo* *.so
[hjl@gnu-cfl-3 tls-3]$ ls
ld  Makefile  tls-def1.c  tls-gd1.S  tls-main1.c  y
[hjl@gnu-cfl-3 tls-3]$ cat tls-gd1.S
        .text
        .p2align 4,,15
        .globl  get_gd
        .type   get_gd, @function
get_gd:
        pushl   %ebx
        call    __x86.get_pc_thunk.bx
        addl    $_GLOBAL_OFFSET_TABLE_, %ebx
        subl    $8, %esp
        movl    gd@tlsgd(,%ebx,1), %eax
        call    ___tls_get_addr@PLT
        addl    $8, %esp
        popl    %ebx
        ret
        .size   get_gd, .-get_gd
        .section .text,"axG",@progbits,__x86.get_pc_thunk.bx,comdat,unique,1
        .globl  __x86.get_pc_thunk.bx
        .hidden __x86.get_pc_thunk.bx
        .type   __x86.get_pc_thunk.bx, @function
__x86.get_pc_thunk.bx:
        movl    (%esp), %ebx
        ret
        .section        .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-3 tls-3]$ cat tls-main1.c 
extern int * get_gd (void);
__thread int gd = 4;

int
main ()
{
  return get_gd () == &gd ? 0 : 1;
}
[hjl@gnu-cfl-3 tls-3]$ make y
gcc -B./ -m32 -O2 -g   -c -o tls-main1.o tls-main1.c
gcc -B./ -m32 -g -shared -o libtls-gd1.so tls-gd1.S
gcc -B./ -m32 -o y tls-main1.o libtls-gd1.so -Wl,-R,.
[hjl@gnu-cfl-3 tls-3]$ ./y
Segmentation fault (core dumped)
[hjl@gnu-cfl-3 tls-3]$ make x
gcc -B./ -m32    -c -o tls-gd1.o tls-gd1.S
gcc -B./ -m32 -o x tls-main1.o tls-gd1.o
tls-gd1.o: TLS transition from R_386_TLS_GD to R_386_TLS_IE_32 against `gd' at
0x12 in section `.text' failed
./ld: failed to set dynamic section sizes: bad value
collect2: error: ld returned 1 exit status
make: *** [Makefile:24: x] Error 1
[hjl@gnu-cfl-3 tls-3]$ 

Linker should always issue an error for

movl    gd@tlsgd(,%ebx,1), %eax

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