Add --fix-stm32l4xx-629360 to the ARM linker to enable a link-time workaround for a bug in the bus matrix / memory controller for some of the STM32 Cortex-M4 based products (STM32L4xx).

bfd  * bfd-in2.h: Regenerate.
     * bfd-in.h (bfd_arm_stm32l4xx_fix): New enum. Specify how
     STM32L4XX instruction scanning should be done.
     (bfd_elf32_arm_set_stm32l4xx_fix)
     (bfd_elf32_arm_stm32l4xx_erratum_scan)
     (bfd_elf32_arm_stm32l4xx_fix_veneer_locations): Add prototypes.
     (bfd_elf32_arm_set_target_relocs): Add stm32l4xx fix type argument
     to prototype.
     * elf32-arm.c (STM32L4XX_ERRATUM_VENEER_SECTION_NAME)
     (STM32L4XX_ERRATUM_VENEER_ENTRY_NAME): Define macros.
     (elf32_stm32l4xx_erratum_type): New enum.
     (elf32_stm32l4xx_erratum_list): New struct. List of veneers or
     jumps to veneers.
     (_arm_elf_section_data): Add stm32l4xx_erratumcount,
     stm32l4xx_erratumlist.
     (elf32_arm_link_hash_table): Add stm32l4xx_erratum_glue_size,
     stm32l4xx_fix and num_stm32l4xx_fixes fields.
     (ctz): New function.
     (popcount): New function.
     (elf32_arm_link_hash_table_create): Initialize stm32l4xx_fix.
     (put_thumb2_insn): New function.
     (STM32L4XX_ERRATUM_LDM_VENEER_SIZE): Define. Size of a veneer for
     LDM instructions.
     (STM32L4XX_ERRATUM_VLDM_VENEER_SIZE): Define. Size of a veneer for
     VLDM instructions.
     (bfd_elf32_arm_allocate_interworking_sections): Initialise erratum
     glue section.
     (record_stm32l4xx_erratum_veneer) : New function. Create a single
     veneer, and its associated symbols.
     (bfd_elf32_arm_add_glue_sections_to_bfd): Add STM32L4XX erratum glue.
     (bfd_elf32_arm_set_stm32l4xx_fix): New function. Set the type of
     erratum workaround required.
     (bfd_elf32_arm_stm32l4xx_fix_veneer_locations): New function. Find
     out where veneers and branches to veneers have been placed in
     virtual memory after layout.
     (is_thumb2_ldmia): New function.
     (is_thumb2_ldmdb): Likewise.
     (is_thumb2_vldm ): Likewise.
     (stm32l4xx_need_create_replacing_stub): New function. Decide if a
     veneer must be emitted.
     (bfd_elf32_arm_stm32l4xx_erratum_scan): Scan the sections of an
     input BFD for potential erratum-triggering insns. Record results.
     (bfd_elf32_arm_set_target_relocs): Set stm32l4xx_fix field in
     global hash table.
     (elf32_arm_size_dynamic_sections): Collect glue information.
     (create_instruction_branch_absolute): New function.
     (create_instruction_ldmia): Likewise.
     (create_instruction_ldmdb): Likewise.
     (create_instruction_mov): Likewise.
     (create_instruction_sub): Likewise.
     (create_instruction_vldmia): Likewise.
     (create_instruction_vldmdb): Likewise.
     (create_instruction_udf_w): Likewise.
     (create_instruction_udf): Likewise.
     (push_thumb2_insn32): Likewise.
     (push_thumb2_insn16): Likewise.
     (stm32l4xx_fill_stub_udf): Likewise.
     (stm32l4xx_create_replacing_stub_ldmia): New function. Expands the
     replacing stub for ldmia instructions.
     (stm32l4xx_create_replacing_stub_ldmdb): Likewise for ldmdb.
     (stm32l4xx_create_replacing_stub_vldm): Likewise for vldm.
     (stm32l4xx_create_replacing_stub): New function. Dispatches the
     stub emission to the appropriate functions.
     (elf32_arm_write_section): Output veneers, and branches to veneers.

ld   * ld.texinfo: Description of the STM32L4xx erratum workaround.
     * emultempl/armelf.em (stm32l4xx_fix): New.
     (arm_elf_before_allocation): Choose the type of fix, scan for
     erratum.
     (gld${EMULATION_NAME}_finish): Fix veneer locations.
     (arm_elf_create_output_section_statements): Propagate
     stm32l4xx_fix value.
     (PARSE_AND_LIST_PROLOGUE): Define OPTION_STM32L4XX_FIX.
     (PARSE_AND_LIST_LONGOPTS): Add entry for handling
     --fix-stm32l4xx-629360.
     (PARSE_AND_LIST_OPTION): Add entry for helping on
     --fix-stm32l4xx-629360.
     (PARSE_AND_LIST_ARGS_CASES): Treat OPTION_STM32L4XX_FIX.

tests * ld-arm/arm-elf.exp (armelftests_common): Add STM32L4XX
       tests.
     * ld-arm/stm32l4xx-cannot-fix-far-ldm.d: New.
     * ld-arm/stm32l4xx-cannot-fix-far-ldm.s: Likewise.
     * ld-arm/stm32l4xx-cannot-fix-it-block.d: Likewise.
     * ld-arm/stm32l4xx-cannot-fix-it-block.s: Likewise.
     * ld-arm/stm32l4xx-fix-all.d: Likewise.
     * ld-arm/stm32l4xx-fix-all.s: Likewise.
     * ld-arm/stm32l4xx-fix-it-block.d: Likewise.
     * ld-arm/stm32l4xx-fix-it-block.s: Likewise.
     * ld-arm/stm32l4xx-fix-ldm.d: Likewise.
     * ld-arm/stm32l4xx-fix-ldm.s: Likewise.
     * ld-arm/stm32l4xx-fix-vldm.d: Likewise.
     * ld-arm/stm32l4xx-fix-vldm.s: Likewise.

1 files changed, 83 insertions, 0 deletions

diff --git a/ld/testsuite/ld-arm/stm32l4xx-fix-all.d b/ld/testsuite/ld-arm/stm32l4xx-fix-all.d
new file mode 100644
index 0000000..59f3ed1
--- /dev/null
+++ b/ld/testsuite/ld-arm/stm32l4xx-fix-all.d
@@ -0,0 +1,83 @@
+
+.*:     file format elf32-littlearm.*
+
+
+Disassembly of section \.text:
+
+00008000 <__stm32l4xx_veneer_0>:
+    8000:	e899 01fe 	ldmia\.w	r9, {r1, r2, r3, r4, r5, r6, r7, r8}
+    8004:	f000 b84a 	b\.w	809c <__stm32l4xx_veneer_0_r>
+    8008:	f7f0 a000 	udf\.w	#0
+    800c:	f7f0 a000 	udf\.w	#0
+
+00008010 <__stm32l4xx_veneer_1>:
+    8010:	e8b9 01fe 	ldmia\.w	r9!, {r1, r2, r3, r4, r5, r6, r7, r8}
+    8014:	f000 b844 	b\.w	80a0 <__stm32l4xx_veneer_1_r>
+    8018:	f7f0 a000 	udf\.w	#0
+    801c:	f7f0 a000 	udf\.w	#0
+
+00008020 <__stm32l4xx_veneer_2>:
+    8020:	e919 01fe 	ldmdb	r9, {r1, r2, r3, r4, r5, r6, r7, r8}
+    8024:	f000 b83e 	b\.w	80a4 <__stm32l4xx_veneer_2_r>
+    8028:	f7f0 a000 	udf\.w	#0
+    802c:	f7f0 a000 	udf\.w	#0
+
+00008030 <__stm32l4xx_veneer_3>:
+    8030:	e939 01fe 	ldmdb	r9!, {r1, r2, r3, r4, r5, r6, r7, r8}
+    8034:	f000 b838 	b\.w	80a8 <__stm32l4xx_veneer_3_r>
+    8038:	f7f0 a000 	udf\.w	#0
+    803c:	f7f0 a000 	udf\.w	#0
+
+00008040 <__stm32l4xx_veneer_4>:
+    8040:	e8bd 01fe 	ldmia\.w	sp!, {r1, r2, r3, r4, r5, r6, r7, r8}
+    8044:	f000 b832 	b\.w	80ac <__stm32l4xx_veneer_4_r>
+    8048:	f7f0 a000 	udf\.w	#0
+    804c:	f7f0 a000 	udf\.w	#0
+
+00008050 <__stm32l4xx_veneer_5>:
+    8050:	ecd9 0a08 	vldmia	r9, {s1-s8}
+    8054:	f000 b82c 	b\.w	80b0 <__stm32l4xx_veneer_5_r>
+    8058:	f7f0 a000 	udf\.w	#0
+    805c:	f7f0 a000 	udf\.w	#0
+    8060:	f7f0 a000 	udf\.w	#0
+    8064:	f7f0 a000 	udf\.w	#0
+
+00008068 <__stm32l4xx_veneer_6>:
+    8068:	ecf6 4a08 	vldmia	r6!, {s9-s16}
+    806c:	f000 b822 	b\.w	80b4 <__stm32l4xx_veneer_6_r>
+    8070:	f7f0 a000 	udf\.w	#0
+    8074:	f7f0 a000 	udf\.w	#0
+    8078:	f7f0 a000 	udf\.w	#0
+    807c:	f7f0 a000 	udf\.w	#0
+
+00008080 <__stm32l4xx_veneer_7>:
+    8080:	ecfd 0a08 	vpop	{s1-s8}
+    8084:	f000 b818 	b\.w	80b8 <__stm32l4xx_veneer_7_r>
+    8088:	f7f0 a000 	udf\.w	#0
+    808c:	f7f0 a000 	udf\.w	#0
+    8090:	f7f0 a000 	udf\.w	#0
+    8094:	f7f0 a000 	udf\.w	#0
+
+00008098 <_start>:
+    8098:	f7ff bfb2 	b\.w	8000 <__stm32l4xx_veneer_0>
+
+0000809c <__stm32l4xx_veneer_0_r>:
+    809c:	f7ff bfb8 	b\.w	8010 <__stm32l4xx_veneer_1>
+
+000080a0 <__stm32l4xx_veneer_1_r>:
+    80a0:	f7ff bfbe 	b\.w	8020 <__stm32l4xx_veneer_2>
+
+000080a4 <__stm32l4xx_veneer_2_r>:
+    80a4:	f7ff bfc4 	b\.w	8030 <__stm32l4xx_veneer_3>
+
+000080a8 <__stm32l4xx_veneer_3_r>:
+    80a8:	f7ff bfca 	b\.w	8040 <__stm32l4xx_veneer_4>
+
+000080ac <__stm32l4xx_veneer_4_r>:
+    80ac:	f7ff bfd0 	b\.w	8050 <__stm32l4xx_veneer_5>
+
+000080b0 <__stm32l4xx_veneer_5_r>:
+    80b0:	f7ff bfda 	b\.w	8068 <__stm32l4xx_veneer_6>
+
+000080b4 <__stm32l4xx_veneer_6_r>:
+    80b4:	f7ff bfe4 	b\.w	8080 <__stm32l4xx_veneer_7>