old-cross-binutils/ld/testsuite/ld-powerpc/tlsld.s
Alan Modra b86ac8e3a5 Correct PowerPC64 local-dynamic TLS linker optimization
The linker hardcoded r3 into a local-dynamic to local-exec TLS
optimization sequence.  This is normally the case since r3 is required
as a parameter to (the optimized out) __tls_get_addr call.  However,
it is possible for a compiler, LLVM in this case, to set up the
parameter value in another register then copy it to r3 before the
call.

When fixing this problem, I noticed that ppc32 had another bug when
optimizing away one of the TLS insns to a nop.

The patch also tidies a mask used by global-dynamic to initial-exec
TLS optimization, to just select the fields needed.  Leaving the
offset in the instruction wasn't a bug since it will be overwritten
anyway.

bfd/
	* elf64-ppc.c (ppc64_elf_relocate_section): Correct GOT_TLSLD
	optimization.  Tidy mask for GOT_TLSGD optimization.
	* elf32-ppc.c (ppc_elf_relocate_section): Likewise.  Correct
	location of nop zapping high insn too.
ld/testsuite/
	* ld-powerpc/tlsld.d, * ld-powerpc/tlsld.s: New test.
	* ld-powerpc/tlsld32.d, * ld-powerpc/tlsld32.s: New test.
	* ld-powerpc/powerpc.exp: Run them.  Move tocvar and tocnovar.
2015-01-29 13:13:02 +10:30

48 lines
886 B
ArmAsm

.section ".opd","aw",@progbits
.p2align 3
.globl _start
_start:
.quad .L_start,.TOC.@tocbase,0
.text
.L_start:
addis 3,2,PrettyStackTraceHead@got@tlsld@ha
addi 29,3,PrettyStackTraceHead@got@tlsld@l
mr 3,29
bl __tls_get_addr(PrettyStackTraceHead@tlsld)
nop
addis 3,3,PrettyStackTraceHead@dtprel@ha
ld 3,PrettyStackTraceHead@dtprel@l(3)
nop
addi 29,2,PrettyStackTraceHead@got@tlsld
mr 3,29
bl __tls_get_addr(PrettyStackTraceHead@tlsld)
nop
ld 3,PrettyStackTraceHead@dtprel(3)
nop
nop
nop
addis 3,2,PrettyStackTraceHead@got@tlsgd@ha
addi 29,3,PrettyStackTraceHead@got@tlsgd@l
mr 3,29
bl __tls_get_addr(PrettyStackTraceHead@tlsgd)
nop
ld 3,0(3)
nop
nop
addi 29,2,PrettyStackTraceHead@got@tlsgd
mr 3,29
bl __tls_get_addr(PrettyStackTraceHead@tlsgd)
nop
ld 3,0(3)
nop
nop
nop
.section ".tbss","awT",@nobits
.align 3
PrettyStackTraceHead:
.space 8