[AArch64] Relax TLS local dynamic traditional into local executable

The linker relaxation logic will be:

Code sequence I (tiny):

    0x00 adr  x0, :tlsldm:x
    0x04 bl   __tls_get_addr
         |
         V
    0x00 mrs  x0, tpidr_el0
    0x04 add  x0, x0, TCB_SIZE

Code sequence II (small):

    0x00 adrp a0, :tlsldm:x
    0x04 add  a0, #:tlsldm_lo12:x
    0x08 bl   __tls_get_addr
         |
         V
    0x00 mrs  x0, tpidr_el0
    0x04 add  x0, x0, TCB_SIZE
    0x08 nop

2015-09-09  Jiong Wang  <jiong.wang@arm.com>

bfd/
  * elfnn-aarch64.c (aarch64_tls_transition_without_check): Support
  three TLS local dynamic traditional relocations types.
  (elfNN_aarch64_tls_relax): Support TLS local dynamic traditional to
  local executable relaxation.

ld/testsuite/
  * ld-aarch64/tls-relax-ld-le-tiny.s: New testcase.
  * ld-aarch64/tls-relax-ld-le-small.s: Likewise.
  * ld-aarch64/tls-relax-ld-le-tiny.d: New expectation file.
  * ld-aarch64/tls-relax-ld-le-small.d: Likewise.
  * ld-aarch64/aarch64-elf.exp: Run new testcases.

6 files changed, 88 insertions, 0 deletions

diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog
index c92d1e4..ce7f8b7 100644
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2015-09-09  Jiong Wang  <jiong.wang@arm.com>
+
+	* ld-aarch64/tls-relax-ld-le-tiny.s: New testcase.
+	* ld-aarch64/tls-relax-ld-le-small.s: Likewise.
+	* ld-aarch64/tls-relax-ld-le-tiny.d: New expectation file.
+	* ld-aarch64/tls-relax-ld-le-small.d: Likewise.
+	* ld-aarch64/aarch64-elf.exp: Run new testcases.
+
 2015-09-07  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* ld-elf/orphan-7.map: Allow for other discarded sections.
diff --git a/ld/testsuite/ld-aarch64/aarch64-elf.exp b/ld/testsuite/ld-aarch64/aarch64-elf.exp
index cbbe6a9..955484e 100644
--- a/ld/testsuite/ld-aarch64/aarch64-elf.exp
+++ b/ld/testsuite/ld-aarch64/aarch64-elf.exp
@@ -178,6 +178,8 @@ run_dump_test "tls-relax-gdesc-le"
 run_dump_test "tls-relax-gd-ie"
 run_dump_test "tls-relax-gdesc-ie"
 run_dump_test "tls-relax-ie-le"
+run_dump_test "tls-relax-ld-le-small"
+run_dump_test "tls-relax-ld-le-tiny"
 run_dump_test "tls-desc-ie"
 run_dump_test "tls-relax-gdesc-ie-2"
 run_dump_test "tls-relax-gdesc-le-2"
diff --git a/ld/testsuite/ld-aarch64/tls-relax-ld-le-small.d b/ld/testsuite/ld-aarch64/tls-relax-ld-le-small.d
new file mode 100644
index 0000000..fa64829
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/tls-relax-ld-le-small.d
@@ -0,0 +1,13 @@
+#source: tls-relax-ld-le-small.s
+#ld: -T relocs.ld -e0
+#objdump: -dr
+#...
+ +10000:	910003fd 	mov	x29, sp
+ +10004:	d53bd040 	mrs	x0, tpidr_el0
+ +10008:	91004000 	add	x0, x0, #0x10
+ +1000c:	d503201f 	nop
+ +10010:	d503201f 	nop
+ +10014:	91400001 	add	x1, x0, #0x0, lsl #12
+ +10018:	91000021 	add	x1, x1, #0x0
+ +1001c:	90000000 	adrp	x0, 10000 <.*>
+ +10020:	d65f03c0 	ret
diff --git a/ld/testsuite/ld-aarch64/tls-relax-ld-le-small.s b/ld/testsuite/ld-aarch64/tls-relax-ld-le-small.s
new file mode 100644
index 0000000..ea58500
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/tls-relax-ld-le-small.s
@@ -0,0 +1,27 @@
+	.cpu generic+fp+simd
+	.section	.text.startup,"ax",%progbits
+	.align	2
+	.p2align 3,,7
+	.global	main
+	.type	main, %function
+main:
+	add	x29, sp, 0
+	adrp	x0, :tlsldm:global_a0
+	add	x0, x0, #:tlsldm_lo12_nc:global_a0
+	bl	__tls_get_addr
+	nop
+	add	x1, x0, #:dtprel_hi12:global_a0, lsl #12
+	add	x1, x1, #:dtprel_lo12_nc:global_a0
+	adrp	x0, .LC0
+	ret
+	.size	main, .-main
+	.section	.rodata.str1.8,"aMS",%progbits,1
+	.align	3
+.LC0:
+	.string	"Hello world %d\n"
+	.section	.tdata,"awT",%progbits
+	.align	2
+	.type	global_a0, %object
+	.size	global_a0, 4
+global_a0:
+	.word	16
diff --git a/ld/testsuite/ld-aarch64/tls-relax-ld-le-tiny.d b/ld/testsuite/ld-aarch64/tls-relax-ld-le-tiny.d
new file mode 100644
index 0000000..db22677
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/tls-relax-ld-le-tiny.d
@@ -0,0 +1,12 @@
+#source: tls-relax-ld-le-tiny.s
+#ld: -T relocs.ld -e0
+#objdump: -dr
+#...
+ +10000:	910003fd 	mov	x29, sp
+ +10004:	d53bd040 	mrs	x0, tpidr_el0
+ +10008:	91004000 	add	x0, x0, #0x10
+ +1000c:	d503201f 	nop
+ +10010:	91400001 	add	x1, x0, #0x0, lsl #12
+ +10014:	91000021 	add	x1, x1, #0x0
+ +10018:	90000000 	adrp	x0, 10000 <main>
+ +1001c:	d65f03c0 	ret
diff --git a/ld/testsuite/ld-aarch64/tls-relax-ld-le-tiny.s b/ld/testsuite/ld-aarch64/tls-relax-ld-le-tiny.s
new file mode 100644
index 0000000..2336f69
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/tls-relax-ld-le-tiny.s
@@ -0,0 +1,26 @@
+	.cpu generic+fp+simd
+	.section	.text.startup,"ax",%progbits
+	.align	2
+	.p2align 3,,7
+	.global	main
+	.type	main, %function
+main:
+	add	x29, sp, 0
+	adr     x0, :tlsldm:global_a0
+	bl	__tls_get_addr
+	nop
+	add	x1, x0, #:dtprel_hi12:global_a0, lsl #12
+	add	x1, x1, #:dtprel_lo12_nc:global_a0
+	adrp	x0, .LC0
+	ret
+	.size	main, .-main
+	.section	.rodata.str1.8,"aMS",%progbits,1
+	.align	3
+.LC0:
+	.string	"Hello world %d\n"
+	.section	.tdata,"awT",%progbits
+	.align	2
+	.type	global_a0, %object
+	.size	global_a0, 4
+global_a0:
+	.word	16