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[binutils, ARM, 8/16] BFL infrastructure with new global reloc R_ARM_THM_BF18

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This patch is part of a series of patches to add support for Armv8.1-M Mainline instructions to binutils.
This adds infrastructure for the BFL instructions which is one of the first instructions in Arm that have more than one relocations in them.

This adds a new relocation R_ARM_THM_BF18.

The inconsistency between external R_ARM_THM_BF18 and internal
BFD_RELOC_ARM_THUMB_BF19 is because internally we count the static bit-0 of the immediate and we don't externally.

ChangeLog entries are as follows :

*** bfd/ChangeLog ***

2019-04-15  Sudakshina Das  <sudi.das@arm.com>

	* reloc.c (BFD_RELOC_ARM_THUMB_BF19): New
	* libbfd.h: Regenerated.
	* bfd-in2.h: Regenerated.
	* bfd-elf32-arm.c (elf32_arm_howto_table_1): New entry for R_ARM_THM_BF18.
	(elf32_arm_reloc_map elf32_arm_reloc_map): Map BFD_RELOC_ARM_THUMB_BF19
	and R_ARM_THM_BF18 together.
	(elf32_arm_final_link_relocate): New switch case for R_ARM_THM_BF19.

*** elfcpp/ChangeLog ***

2019-04-15  Sudakshina Das  <sudi.das@arm.com>

	* arm.h (R_ARM_THM_BF18): New relocation code.

*** gas/ChangeLog ***

2019-04-15  Sudakshina Das  <sudi.das@arm.com>

	* config/tc-arm.c (md_pcrel_from_section): New switch case for
	BFD_RELOC_ARM_THUMB_BF19.
	(md_appdy_fix): Likewise.
	(tc_gen_reloc): Likewise.

*** include/ChangeLog ***

2019-04-15  Sudakshina Das  <sudi.das@arm.com>

	* elf/arm.h (START_RELOC_NUMBERS): New entry for R_ARM_THM_BF18.

*** opcodes/ChangeLog ***

2019-04-15  Sudakshina Das  <sudi.das@arm.com>

	* arm-dis.c (print_insn_thumb32): Updated to accept new %Y pattern.
This commit is contained in:
Andre Vieira
2019-04-15 11:37:51 +01:00
parent f1c7f42126
commit 1caf72a584
13 changed files with 154 additions and 1 deletions
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18
opcodes/arm-dis.c
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@@ -2715,6 +2715,7 @@ static const struct opcode16 thumb_opcodes[] =
%F print the lsb and width fields of a sbfx/ubfx instruction
%G print a fallback offset for Branch Future instructions
%W print an offset for BF instruction
%Y print an offset for BFL instruction
%b print a conditional branch offset
%B print an unconditional branch offset
%s print the shift field of an SSAT instruction
@@ -5898,6 +5899,23 @@ print_insn_thumb32 (bfd_vma pc, struct disassemble_info *info, long given)
}
break;
case 'Y':
{
unsigned int immA = (given & 0x007f0000u) >> 16;
unsigned int immB = (given & 0x000007feu) >> 1;
unsigned int immC = (given & 0x00000800u) >> 11;
bfd_vma offset = 0;
offset |= immA << 12;
offset |= immB << 2;
offset |= immC << 1;
/* Sign extend. */
offset = (offset & 0x40000) ? offset - (1 << 19) : offset;
info->print_address_func (pc + 4 + offset, info);
}
break;
case 'b':
{
unsigned int S = (given & 0x04000000u) >> 26;