binutils-gdb/gold/testsuite/pr20216_ld.S

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gold: Support x86-64 TLS code sequences without PLT There are extensions to x86-64 psABI: https://groups.google.com/forum/#!topic/x86-64-abi/de5_KnLHxtI to call tls_get_addr via GOT: call *__tls_get_addr@GOTPCREL(%rip) Since direct call is 4-byte long and indirect call, is 5-byte long, the extra one byte must be handled properly. For general dynamic model, one 0x66 prefix before call instruction is removed to make room for indirect call. For local dynamic model, we simply use 5-byte indirect call. TLS linker optimization is updated to recognize new instruction patterns. For local dynamic model to local exec model transition, we generate 4 0x66 prefixes, instead of 3, before mov instruction in 64-bit and generate a 5-byte nop, instead of 4-byte, before mov instruction in 32-bit. PR gold/20216 * configure.ac (DEFAULT_TARGET_X86_64_OR_X32): New AM_CONDITIONAL. * configure: Regenerated. * x86_64.cc (Target_x86_64<size>::Relocate::relocate): Allow R_X86_64_GOTPCRELX relocation against __tls_get_addr. (Target_x86_64<size>::Relocate::tls_gd_to_ie): Support indirect call to __tls_get_addr. (Target_x86_64<size>::Relocate::tls_gd_to_le): Likewise. (Target_x86_64<size>::Relocate::tls_ld_to_le): Likewise. * testsuite/Makefile.am (check_PROGRAMS): Add pr20216a_test, pr20216b_test, pr20216c_test, pr20216d_test, pr20216e_test. (pr20216a_test_SOURCES): New. (pr20216a_test_DEPENDENCIES): Likewise. (pr20216a_test_CFLAGS): Likewise. (pr20216a_test_LDFLAGS): Likewise. (pr20216a_test_LDADD): Likewise. (pr20216b_test_SOURCES): Likewise. (pr20216b_test_DEPENDENCIES): Likewise. (pr20216b_test_CFLAGS): Likewise. (pr20216b_test_LDFLAGS): Likewise. (pr20216b_test_LDADD): Likewise. (pr20216c_test_SOURCES): Likewise. (pr20216c_test_DEPENDENCIES): Likewise. (pr20216c_test_CFLAGS): Likewise. (pr20216c_test_LDFLAGS): Likewise. (pr20216c_test_LDADD): Likewise. (pr20216d_test_SOURCES): Likewise. (pr20216d_test_DEPENDENCIES): Likewise. (pr20216d_test_CFLAGS): Likewise. (pr20216d_test_LDFLAGS): Likewise. (pr20216d_test_LDADD): Likewise. (pr20216e_test_SOURCES): Likewise. (pr20216e_test_DEPENDENCIES): Likewise. (pr20216e_test_CFLAGS): Likewise. (pr20216e_test_LDFLAGS): Likewise. (pr20216e_test_LDADD): Likewise. (pr20216a.so): Likewise. (pr20216b.so): Likewise. (pr20216_gd.o): Likewise. (pr20216_ld.o): Likewise. (MOSTLYCLEANFILES): Add pr20216a.so pr20216b.so. * testsuite/Makefile.in: Regenerated. * testsuite/pr20216_def.c: New file. * testsuite/pr20216_gd.S: Likewise. * testsuite/pr20216_ld.S: Likewise. * testsuite/pr20216_main.c: Likewise.
2016-06-29 23:37:30 +08:00
.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