https://sourceware.org/bugzilla/show_bug.cgi?id=20216
Bug ID: 20216
Summary: Gold should support x86-64 TLS code sequences without
PLT
Product: binutils
Version: 2.27 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: hjl.tools at gmail dot com
CC: ian at airs dot com
Target Milestone: ---
Target: x86-64
ld supports x86-64 TLS code sequences without PLT:
commit e2cbcd9156d1606a9f2153aecd93a89fe6e29180
Author: H.J. Lu <hjl.to...@gmail.com>
Date: Mon Jun 6 11:06:55 2016 -0700
Support x86-64 TLS code sequences without PLT
Gold should also support it:
[hjl@gnu-6 tls-10a]$ cat main.c
#include <stdio.h>
#include <stdlib.h>
extern int * get_gd (void);
extern void set_gd (int);
extern int test_gd (int);
extern int * get_ld (void);
extern void set_ld (int);
extern int test_ld (int);
int
main ()
{
int *p;
p = get_gd ();
set_gd (3);
if (*p != 3 || !test_gd (3))
abort ();
p = get_ld ();
set_ld (4);
if (*p != 4 || !test_ld (4))
abort ();
printf ("PASS\n");
return 0;
}
[hjl@gnu-6 tls-10a]$ cat def.c
__thread int gd = 1;
[hjl@gnu-6 tls-10a]$ cat gd.S
.text
.p2align 4,,15
.globl get_gd
.type get_gd, @function
get_gd:
subq $8, %rsp
.byte 0x66
leaq gd@tlsgd(%rip), %rdi
.byte 0x66
rex64
call *__tls_get_addr@GOTPCREL(%rip)
addq $8, %rsp
ret
.size get_gd, .-get_gd
.text
.p2align 4,,15
.globl set_gd
.type set_gd, @function
set_gd:
pushq %rbx
movl %edi, %ebx
.byte 0x66
leaq gd@tlsgd(%rip), %rdi
.value 0x6666
rex64
call __tls_get_addr@PLT
movl %ebx, (%rax)
popq %rbx
ret
.size set_gd, .-set_gd
.text
.p2align 4,,15
.globl test_gd
.type test_gd, @function
test_gd:
pushq %rbx
movl %edi, %ebx
.byte 0x66
leaq gd@tlsgd(%rip), %rdi
.byte 0x66
rex64
call *__tls_get_addr@GOTPCREL(%rip)
cmpl %ebx, (%rax)
popq %rbx
sete %al
movzbl %al, %eax
ret
.size test_gd, .-test_gd
.section .note.GNU-stack,"",@progbits
[hjl@gnu-6 tls-10a]$ cat ld.S
.text
.p2align 4,,15
.globl get_ld
.type get_ld, @function
get_ld:
subq $8, %rsp
leaq ld@tlsld(%rip), %rdi
call __tls_get_addr@PLT
addq $8, %rsp
addq $ld@dtpoff, %rax
ret
.size get_ld, .-get_ld
.text
.p2align 4,,15
.globl set_ld
.type set_ld, @function
set_ld:
pushq %rbx
movl %edi, %ebx
leaq ld@tlsld(%rip), %rdi
call *__tls_get_addr@GOTPCREL(%rip)
movl %ebx, ld@dtpoff(%rax)
popq %rbx
ret
.size set_ld, .-set_ld
.text
.p2align 4,,15
.globl test_ld
.type test_ld, @function
test_ld:
pushq %rbx
movl %edi, %ebx
leaq ld@tlsld(%rip), %rdi
call *__tls_get_addr@GOTPCREL(%rip)
cmpl %ebx, ld@dtpoff(%rax)
popq %rbx
sete %al
movzbl %al, %eax
ret
.size test_ld, .-test_ld
.section .tbss,"awT",@nobits
.align 4
.type ld, @object
.size ld, 4
ld:
.zero 4
.section .note.GNU-stack,"",@progbits
[hjl@gnu-6 tls-10a]$ make
gcc -fuse-ld=gold -fPIE -O3 -fno-asynchronous-unwind-tables -c -o main.o
main.c
gcc -fuse-ld=gold -fPIE -O3 -fno-asynchronous-unwind-tables -c -o def.o def.c
gcc -fuse-ld=gold -fPIE -O3 -fno-asynchronous-unwind-tables -fPIC -c gd.S
gcc -fuse-ld=gold -fPIE -O3 -fno-asynchronous-unwind-tables -fPIC -c ld.S
ld.gold -shared -o libtls.so gd.o ld.o
gcc -fuse-ld=gold -o x main.o def.o libtls.so -Wl,-R,.
gcc -fuse-ld=gold -static -o y main.o def.o gd.o ld.o -Wl,-R,.
gd.o:function get_gd: error: TLS relocation against invalid instruction
gd.o:function get_gd: error: missing expected TLS relocation
gd.o:function set_gd: error: missing expected TLS relocation
gd.o:function test_gd: error: TLS relocation against invalid instruction
gd.o:function test_gd: error: missing expected TLS relocation
/usr/local/bin/ld.gold: error: missing expected TLS relocation
ld.o:function set_ld: error: TLS relocation against invalid instruction
ld.o:function set_ld: error: missing expected TLS relocation
ld.o:function set_ld: error: missing expected TLS relocation
ld.o:function test_ld: error: missing expected TLS relocation
ld.o:function test_ld: error: TLS relocation against invalid instruction
ld.o:function test_ld: error: missing expected TLS relocation
ld.o:function test_ld: error: missing expected TLS relocation
/usr/local/bin/ld.gold: error: missing expected TLS relocation
collect2: error: ld returned 1 exit status
Makefile:28: recipe for target 'y' failed
make: *** [y] Error 1
[hjl@gnu-6 tls-10a]$
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