diff options
Diffstat (limited to 'bfd/elf32-arm.c')
| -rw-r--r-- | bfd/elf32-arm.c | 73 |
1 files changed, 67 insertions, 6 deletions
diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c index 9331471..834d615 100644 --- a/bfd/elf32-arm.c +++ b/bfd/elf32-arm.c @@ -2360,6 +2360,8 @@ enum stub_insn_type is inserted in arm_build_one_stub(). */ #define THUMB16_BCOND_INSN(X) {(X), THUMB16_TYPE, R_ARM_NONE, 1} #define THUMB32_INSN(X) {(X), THUMB32_TYPE, R_ARM_NONE, 0} +#define THUMB32_MOVT(X) {(X), THUMB32_TYPE, R_ARM_THM_MOVT_ABS, 0} +#define THUMB32_MOVW(X) {(X), THUMB32_TYPE, R_ARM_THM_MOVW_ABS_NC, 0} #define THUMB32_B_INSN(X, Z) {(X), THUMB32_TYPE, R_ARM_THM_JUMP24, (Z)} #define ARM_INSN(X) {(X), ARM_TYPE, R_ARM_NONE, 0} #define ARM_REL_INSN(X, Z) {(X), ARM_TYPE, R_ARM_JUMP24, (Z)} @@ -2409,6 +2411,15 @@ static const insn_sequence elf32_arm_stub_long_branch_thumb2_only[] = DATA_WORD (0, R_ARM_ABS32, 0), /* dcd R_ARM_ABS32(x) */ }; +/* Thumb -> Thumb long branch stub. Used for PureCode sections on Thumb2 + M-profile architectures. */ +static const insn_sequence elf32_arm_stub_long_branch_thumb2_only_pure[] = +{ + THUMB32_MOVW (0xf2400c00), /* mov.w ip, R_ARM_MOVW_ABS_NC */ + THUMB32_MOVT (0xf2c00c00), /* movt ip, R_ARM_MOVT_ABS << 16 */ + THUMB16_INSN (0x4760), /* bx ip */ +}; + /* V4T Thumb -> Thumb long branch stub. Using the stack is not allowed. */ static const insn_sequence elf32_arm_stub_long_branch_v4t_thumb_thumb[] = @@ -2634,6 +2645,7 @@ static const insn_sequence elf32_arm_stub_a8_veneer_blx[] = DEF_STUB(a8_veneer_bl) \ DEF_STUB(a8_veneer_blx) \ DEF_STUB(long_branch_thumb2_only) \ + DEF_STUB(long_branch_thumb2_only_pure) #define DEF_STUB(x) arm_stub_##x, enum elf32_arm_stub_type @@ -3808,6 +3820,7 @@ arm_stub_is_thumb (enum elf32_arm_stub_type stub_type) { case arm_stub_long_branch_thumb_only: case arm_stub_long_branch_thumb2_only: + case arm_stub_long_branch_thumb2_only_pure: case arm_stub_long_branch_v4t_thumb_arm: case arm_stub_short_branch_v4t_thumb_arm: case arm_stub_long_branch_v4t_thumb_arm_pic: @@ -3847,6 +3860,8 @@ arm_type_of_stub (struct bfd_link_info *info, enum arm_st_branch_type branch_type = *actual_branch_type; union gotplt_union *root_plt; struct arm_plt_info *arm_plt; + int arch; + int thumb2_movw; if (branch_type == ST_BRANCH_LONG) return stub_type; @@ -3859,6 +3874,11 @@ arm_type_of_stub (struct bfd_link_info *info, thumb2 = using_thumb2 (globals); thumb2_bl = using_thumb2_bl (globals); + arch = bfd_elf_get_obj_attr_int (globals->obfd, OBJ_ATTR_PROC, Tag_CPU_arch); + + /* True for architectures that implement the thumb2 movw instruction. */ + thumb2_movw = thumb2 || (arch == TAG_CPU_ARCH_V8M_BASE); + /* Determine where the call point is. */ location = (input_sec->output_offset + input_sec->output_section->vma @@ -3945,6 +3965,15 @@ arm_type_of_stub (struct bfd_link_info *info, /* Thumb to thumb. */ if (!thumb_only) { + if (input_sec->flags & SEC_ELF_PURECODE) + (*_bfd_error_handler) (_("%B(%s): warning: long branch " + " veneers used in section with " + "SHF_ARM_PURECODE section " + "attribute is only supported" + " for M-profile targets that " + "implement the movw " + "instruction.")); + stub_type = (bfd_link_pic (info) | globals->pic_veneer) /* PIC stubs. */ ? ((globals->use_blx @@ -3967,16 +3996,39 @@ arm_type_of_stub (struct bfd_link_info *info, } else { - stub_type = (bfd_link_pic (info) | globals->pic_veneer) - /* PIC stub. */ - ? arm_stub_long_branch_thumb_only_pic - /* non-PIC stub. */ - : (thumb2 ? arm_stub_long_branch_thumb2_only - : arm_stub_long_branch_thumb_only); + if (thumb2_movw && (input_sec->flags & SEC_ELF_PURECODE)) + stub_type = arm_stub_long_branch_thumb2_only_pure; + else + { + if (input_sec->flags & SEC_ELF_PURECODE) + (*_bfd_error_handler) (_("%B(%s): warning: long branch " + " veneers used in section with " + "SHF_ARM_PURECODE section " + "attribute is only supported" + " for M-profile targets that " + "implement the movw " + "instruction.")); + + stub_type = (bfd_link_pic (info) | globals->pic_veneer) + /* PIC stub. */ + ? arm_stub_long_branch_thumb_only_pic + /* non-PIC stub. */ + : (thumb2 ? arm_stub_long_branch_thumb2_only + : arm_stub_long_branch_thumb_only); + } } } else { + if (input_sec->flags & SEC_ELF_PURECODE) + (*_bfd_error_handler) (_("%B(%s): warning: long branch " + " veneers used in section with " + "SHF_ARM_PURECODE section " + "attribute is only supported" + " for M-profile targets that " + "implement the movw " + "instruction.")); + /* Thumb to arm. */ if (sym_sec != NULL && sym_sec->owner != NULL @@ -4021,6 +4073,14 @@ arm_type_of_stub (struct bfd_link_info *info, || r_type == R_ARM_PLT32 || r_type == R_ARM_TLS_CALL) { + if (input_sec->flags & SEC_ELF_PURECODE) + (*_bfd_error_handler) (_("%B(%s): warning: long branch " + " veneers used in section with " + "SHF_ARM_PURECODE section " + "attribute is only supported" + " for M-profile targets that " + "implement the movw " + "instruction.")); if (branch_type == ST_BRANCH_TO_THUMB) { /* Arm to thumb. */ @@ -4446,6 +4506,7 @@ arm_stub_required_alignment (enum elf32_arm_stub_type stub_type) case arm_stub_long_branch_v4t_arm_thumb: case arm_stub_long_branch_thumb_only: case arm_stub_long_branch_thumb2_only: + case arm_stub_long_branch_thumb2_only_pure: case arm_stub_long_branch_v4t_thumb_thumb: case arm_stub_long_branch_v4t_thumb_arm: case arm_stub_short_branch_v4t_thumb_arm: |