[ARM] Add support for thumb1 pcrop relocations.

To support thumb1 execute-only code we need to support four new
relocations (R_ARM_THM_ALU_ABS_G0_NC, R_ARM_THM_ALU_ABS_G1_NC,
R_ARM_THM_ALU_ABS_G2_NC and  R_ARM_THM_ALU_ABS_G3_NC).
These relocations allow the static linker to finalize construction
of symbol address.
Typical sequence of code to get address of the symbol foo is then
the following :
	movs	r3, #:upper8_15:#foo
	lsls	r3, #8
	adds	r3, #:upper0_7:#foo
	lsls	r3, #8
	adds	r3, #:lower8_15:#foo
	lsls	r3, #8
	adds	r3, #:lower0_7:#foo
This will give following sequence of text and relocations after
assembly :
   4:	2300      	movs	r3, #0
			4: R_ARM_THM_ALU_ABS_G3_NC	foo
   6:	021b      	lsls	r3, r3, #8
   8:	3300      	adds	r3, #0
			8: R_ARM_THM_ALU_ABS_G2_NC	foo
   a:	021b      	lsls	r3, r3, #8
   c:	3300      	adds	r3, #0
			c: R_ARM_THM_ALU_ABS_G1_NC	foo
   e:	021b      	lsls	r3, r3, #8
  10:	3300      	adds	r3, #0
			10: R_ARM_THM_ALU_ABS_G0_NC	foo

5 files changed, 168 insertions, 0 deletions

diff --git a/ld/testsuite/ld-arm/arm-elf.exp b/ld/testsuite/ld-arm/arm-elf.exp
index 1d9b1c8..23c9e57 100644
--- a/ld/testsuite/ld-arm/arm-elf.exp
+++ b/ld/testsuite/ld-arm/arm-elf.exp
@@ -223,6 +223,12 @@ set armelftests_common {
      "" {pcrel-shared.s}
      {{readelf -dr pcrel-shared.rd}}
      "pcrel-shared.so"}
+    {"MOVS thumb1 relocations" "-static -T arm.ld" "" "" {thumb1-movs.s}
+     {{objdump -dw thumb1-movs.d}}
+     "thumb1-movs"}
+    {"ADDS thumb1 relocations" "-static -T arm.ld" "" "" {thumb1-adds.s}
+     {{objdump -dw thumb1-adds.d}}
+     "thumb1-adds"}
 }
 
 set armelftests_nonacl {
diff --git a/ld/testsuite/ld-arm/thumb1-adds.d b/ld/testsuite/ld-arm/thumb1-adds.d
new file mode 100644
index 0000000..68ef68e
--- /dev/null
+++ b/ld/testsuite/ld-arm/thumb1-adds.d
@@ -0,0 +1,38 @@
+
+.*:     file format.*
+
+Disassembly of section .text:
+
+00008000 <[^>]*>:
+    8000:	3012      	adds	r0, #18
+    8002:	3134      	adds	r1, #52	; 0x34
+    8004:	3280      	adds	r2, #128	; 0x80
+    8006:	3301      	adds	r3, #1
+    8008:	3401      	adds	r4, #1
+    800a:	3500      	adds	r5, #0
+    800c:	3600      	adds	r6, #0
+    800e:	3700      	adds	r7, #0
+
+00008010 <[^>]*>:
+    8010:	3012      	adds	r0, #18
+    8012:	3100      	adds	r1, #0
+    8014:	3200      	adds	r2, #0
+    8016:	33ca      	adds	r3, #202	; 0xca
+    8018:	3700      	adds	r7, #0
+    801a:	3634      	adds	r6, #52	; 0x34
+    801c:	3581      	adds	r5, #129	; 0x81
+    801e:	3423      	adds	r4, #35	; 0x23
+
+00008020 <[^>]*>:
+    8020:	01          	.byte	0x01
+
+00008021 <[^>]*>:
+    8021:	02          	.byte	0x02
+
+Disassembly of section .far:
+
+12340000 <[^>]*>:
+12340000:	3000      	adds	r0, #0
+12340002:	3100      	adds	r1, #0
+12340004:	3200      	adds	r2, #0
+12340006:	3301      	adds	r3, #1
diff --git a/ld/testsuite/ld-arm/thumb1-adds.s b/ld/testsuite/ld-arm/thumb1-adds.s
new file mode 100644
index 0000000..3dde045
--- /dev/null
+++ b/ld/testsuite/ld-arm/thumb1-adds.s
@@ -0,0 +1,43 @@
+	.text
+	.arch armv6s-m
+	.syntax unified
+	.global	_start
+	.thumb_func
+	.type	_start, %function
+_start:
+	.thumb_func
+	.type	thumb1, %function
+thumb1:
+	adds r0, #:upper8_15:#thumb3
+	adds r1, #:upper0_7:#thumb3
+	adds r2, #:lower8_15:#thumb1
+	adds r3, #:lower0_7:#thumb1
+	adds r4, #:lower0_7:#thumb3
+	adds r5, #:lower8_15:#thumb3
+	adds r6, #:upper0_7:#thumb1
+	adds r7, #:upper8_15:#thumb1
+	.thumb_func
+	.type	thumb2, %function
+thumb2:
+	adds r0, #:upper8_15:#thumb3
+	adds r1, #:upper0_7:#(var2 + 1)
+	adds r2, #:lower8_15:#(thumb3 + 255)
+	adds r3, #:lower0_7:#(var1 + 0xaa)
+	adds r7, #:upper8_15:#var1 + 4
+	adds r6, #:upper0_7:#thumb3
+	adds r5, #:lower8_15:#var2 + 0xff
+	adds r4, #:lower0_7:#var2 - (-2)
+var1:
+	.byte 1
+var2:
+	.byte 2
+
+	.section .far, "ax", %progbits
+	.thumb_func
+	.type	thumb3, %function
+thumb3:
+	adds r0, #:upper8_15:#thumb1
+	adds r1, #:upper0_7:#thumb2
+	adds r2, #:lower8_15:#thumb3
+	adds r3, #:lower0_7:#thumb1
+
diff --git a/ld/testsuite/ld-arm/thumb1-movs.d b/ld/testsuite/ld-arm/thumb1-movs.d
new file mode 100644
index 0000000..6a72bc1
--- /dev/null
+++ b/ld/testsuite/ld-arm/thumb1-movs.d
@@ -0,0 +1,38 @@
+
+.*:     file format.*
+
+Disassembly of section .text:
+
+00008000 <[^>]*>:
+    8000:	2012      	movs	r0, #18
+    8002:	2134      	movs	r1, #52	; 0x34
+    8004:	2280      	movs	r2, #128	; 0x80
+    8006:	2301      	movs	r3, #1
+    8008:	2401      	movs	r4, #1
+    800a:	2500      	movs	r5, #0
+    800c:	2600      	movs	r6, #0
+    800e:	2700      	movs	r7, #0
+
+00008010 <[^>]*>:
+    8010:	2012      	movs	r0, #18
+    8012:	2100      	movs	r1, #0
+    8014:	2281      	movs	r2, #129	; 0x81
+    8016:	2320      	movs	r3, #32
+    8018:	2700      	movs	r7, #0
+    801a:	2600      	movs	r6, #0
+    801c:	2581      	movs	r5, #129	; 0x81
+    801e:	2422      	movs	r4, #34	; 0x22
+
+00008020 <[^>]*>:
+    8020:	01          	.byte	0x01
+
+00008021 <[^>]*>:
+    8021:	02          	.byte	0x02
+
+Disassembly of section .far:
+
+12340000 <[^>]*>:
+12340000:	2000      	movs	r0, #0
+12340002:	2100      	movs	r1, #0
+12340004:	2200      	movs	r2, #0
+12340006:	2301      	movs	r3, #1
diff --git a/ld/testsuite/ld-arm/thumb1-movs.s b/ld/testsuite/ld-arm/thumb1-movs.s
new file mode 100644
index 0000000..80acfd5
--- /dev/null
+++ b/ld/testsuite/ld-arm/thumb1-movs.s
@@ -0,0 +1,43 @@
+	.text
+	.arch armv6s-m
+	.syntax unified
+	.global	_start
+	.thumb_func
+	.type	_start, %function
+_start:
+	.thumb_func
+	.type	thumb1, %function
+thumb1:
+	movs r0, #:upper8_15:#thumb3
+	movs r1, #:upper0_7:#thumb3
+	movs r2, #:lower8_15:#thumb1
+	movs r3, #:lower0_7:#thumb1
+	movs r4, #:lower0_7:#thumb3
+	movs r5, #:lower8_15:#thumb3
+	movs r6, #:upper0_7:#thumb1
+	movs r7, #:upper8_15:#thumb1
+	.thumb_func
+	.type	thumb2, %function
+thumb2:
+	movs r0, #:upper8_15:#(thumb3 + 0)
+	movs r1, #:upper0_7:#(thumb2 + 1)
+	movs r2, #:lower8_15:#(var1 + 255)
+	movs r3, #:lower0_7:#var1
+	movs r7, #:upper8_15:#var1 + 4
+	movs r6, #:upper0_7:#var2
+	movs r5, #:lower8_15:#var2 + 0xff
+	movs r4, #:lower0_7:#var2 - (-1)
+var1:
+	.byte 1
+var2:
+	.byte 2
+
+	.section .far, "ax", %progbits
+	.thumb_func
+	.type	thumb3, %function
+thumb3:
+	movs r0, #:upper8_15:#thumb1
+	movs r1, #:upper0_7:#thumb2
+	movs r2, #:lower8_15:#thumb3
+	movs r3, #:lower0_7:#thumb1
+