2008-02-20 Paul Brook <paul@codesourcery.com>

	ld/
	* emultempl/armelf.em (OPTION_FIX_V4BX_INTERWORKING): Define.
	(PARSE_AND_LIST_LONGOPTS): Add fix-v4bx-interworking.
	(PARSE_AND_LIST_OPTIONS): Ditto.
	(PARSE_AND_LIST_ARGS_CASES): Handle OPTION_FIX_V4BX_INTERWORKING.
	* emulparams/armelf.sh (OTHER_TEXT_SECTIONS): Add .v4_bx.
	* emulparams/armelf_linux.sh (OTHER_TEXT_SECTIONS): Ditto.
	* emulparams/armnto.sh (OTHER_TEXT_SECTIONS): Ditto.
	* ld.texinfo: Document --fix-v4bx-interworking.

	ld/testsuite/
	* ld-arm/armv4-bx.d: New test.
	* ld-arm/armv4-bx.s: New test.
	* ld-arm/arm.ld: Add .v4bx.
	* ld-arm/arm-elf.exp: Add armv4-bx.

	gas/testsuite/
	* gas/arm/thumb.d: Exclude EABI targets.
	* gas/arm/arch4t.d: Exclude EABI targts.
	* gas/arm/v4bx.d: New test.
	* gas/arm/v4bx.s: New test.
	* gas/arm/thumb-eabi.d: New test.
	* gas/arm/arch4t-eabi.d: New test.

	gas/
	* config/tc-arm.c (fix_v4bx): New variable.
	(do_bx): Generate V4BX relocations.
	(md_assemble): Allow bx on v4 codes when fix_v4bx.
	(md_apply_fix): Handle BFD_RELOC_ARM_V4BX.
	(tc_gen_reloc): Ditto.
	(OPTION_FIX_V4BX): Define.
	(md_longopts): Add fix-v4bx.
	(md_parse_option): Handle OPTION_FIX_V4BX.
	(md_show_usage): Document --fix-v4bx.
	* doc/c-arm.texi: Document --fix-v4bx.

	bfd/
	* reloc.c: Add BFD_RELOC_ARM_V4BX.
	* elf32-arm.c (elf32_arm_reloc_map): Add BFD_RELOC_ARM_V4BX.
	(ARM_BX_GLUE_SECTION_NAME, ARM_BX_GLUE_SECTION_NAME): Define.
	(elf32_arm_link_hash_table): Add bx_glue_size and bx_glue_offset.
	Update comment for fix_v4bx.
	(elf32_arm_link_hash_table_create): Zero bx_glue_size and
	bx_glue_offset.
	(ARM_BX_VENEER_SIZE, armbx1_tst_insn, armbx2_moveq_insn,
	armbx3_bx_insn): New.
	(bfd_elf32_arm_allocate_interworking_sections): Allocate BX veneer
	section.
	(bfd_elf32_arm_add_glue_sections_to_bfd): Ditto.
	(bfd_elf32_arm_process_before_allocation): Record BX veneers.
	(record_arm_bx_glue, elf32_arm_bx_glue): New functions.
	(elf32_arm_final_link_relocate): Handle BX veneers.
	(elf32_arm_output_arch_local_syms): Output mapping symbol for .v4_bx.
	* bfd-in2.h: Regenerate.
	* libbfd.h: Regenerate.

4 files changed, 31 insertions, 0 deletions

diff --git a/ld/testsuite/ld-arm/arm-elf.exp b/ld/testsuite/ld-arm/arm-elf.exp
index 8897968..3f2b69c 100644
--- a/ld/testsuite/ld-arm/arm-elf.exp
+++ b/ld/testsuite/ld-arm/arm-elf.exp
@@ -173,6 +173,9 @@ set armelftests {
      {"callweak" "-static -T arm.ld" "" {callweak.s}
       {{objdump -dr callweak.d}}
       "callweak"}
+    {"ARMv4 interworking" "-static -T arm.ld --fix-v4bx-interworking" "--fix-v4bx -meabi=4" {armv4-bx.s}
+     {{objdump -d armv4-bx.d}}
+     "armv4-bx"}
 }
 
 run_ld_link_tests $armelftests
diff --git a/ld/testsuite/ld-arm/arm.ld b/ld/testsuite/ld-arm/arm.ld
index c9e01e6..cb73fb3 100644
--- a/ld/testsuite/ld-arm/arm.ld
+++ b/ld/testsuite/ld-arm/arm.ld
@@ -11,6 +11,7 @@ SECTIONS
     *(.text)
     *(.after)
     *(.glue_7)
+    *(.v4_bx)
   } =0
   . = 0x9000;
   .got            : { *(.got) *(.got.plt)}
diff --git a/ld/testsuite/ld-arm/armv4-bx.d b/ld/testsuite/ld-arm/armv4-bx.d
new file mode 100644
index 0000000..095b387
--- /dev/null
+++ b/ld/testsuite/ld-arm/armv4-bx.d
@@ -0,0 +1,19 @@
+
+.*: .*file format elf32-(big|little)arm
+
+Disassembly of section \.text:
+
+00008000 <_start>:
+    8000:	ea000001 	b	800c \<__bx_r14\>
+    8004:	ea000003 	b	8018 \<__bx_r0\>
+    8008:	0a000002 	beq	8018 \<__bx_r0\>
+
+0000800c <__bx_r14>:
+    800c:	e31e0001 	tst	lr, #1	; 0x1
+    8010:	01a0f00e 	moveq	pc, lr
+    8014:	e12fff1e 	bx	lr
+
+00008018 <__bx_r0>:
+    8018:	e3100001 	tst	r0, #1	; 0x1
+    801c:	01a0f000 	moveq	pc, r0
+    8020:	e12fff10 	bx	r0
diff --git a/ld/testsuite/ld-arm/armv4-bx.s b/ld/testsuite/ld-arm/armv4-bx.s
new file mode 100644
index 0000000..ef86357
--- /dev/null
+++ b/ld/testsuite/ld-arm/armv4-bx.s
@@ -0,0 +1,8 @@
+.text
+.arch armv4
+.global _start
+.type _start, %function
+_start:
+bx lr
+bx r0
+bxeq r0