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Diffstat (limited to 'bfd/elf32-arm.c')
-rw-r--r--bfd/elf32-arm.c100
1 files changed, 73 insertions, 27 deletions
diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c
index 7499f80..2527e5e 100644
--- a/bfd/elf32-arm.c
+++ b/bfd/elf32-arm.c
@@ -2018,13 +2018,6 @@ enum stub_insn_type
DATA_TYPE
};
-enum stub_reloc_type
- {
- STUB_RELOC_NONE = 0,
- STUB_RELOC_ABS,
- STUB_RELOC_PIC,
- };
-
#define THUMB16_INSN(X) {(X), THUMB16_TYPE, R_ARM_NONE, 0}
#define THUMB32_INSN(X) {(X), THUMB32_TYPE, R_ARM_NONE, 0}
#define ARM_INSN(X) {(X), ARM_TYPE, R_ARM_NONE, 0}
@@ -2035,7 +2028,7 @@ typedef struct
{
bfd_vma data;
enum stub_insn_type type;
- enum stub_reloc_type reloc_type;
+ unsigned int r_type;
int reloc_addend;
} insn_sequence;
@@ -2110,6 +2103,39 @@ static const insn_sequence elf32_arm_stub_long_branch_any_thumb_pic[] =
DATA_WORD(0, R_ARM_REL32, 0), /* dcd R_ARM_REL32(X) */
};
+/* V4T ARM -> ARM long branch stub, PIC. */
+static const insn_sequence elf32_arm_stub_long_branch_v4t_arm_thumb_pic[] =
+ {
+ ARM_INSN(0xe59fc004), /* ldr ip, [pc, #4] */
+ ARM_INSN(0xe08fc00c), /* add ip, pc, ip */
+ ARM_INSN(0xe12fff1c), /* bx ip */
+ DATA_WORD(0, R_ARM_REL32, 0), /* dcd R_ARM_REL32(X) */
+ };
+
+/* V4T Thumb -> ARM long branch stub, PIC. */
+static const insn_sequence elf32_arm_stub_long_branch_v4t_thumb_arm_pic[] =
+ {
+ THUMB16_INSN(0x4778), /* bx pc */
+ THUMB16_INSN(0x46c0), /* nop */
+ ARM_INSN(0xe59fc000), /* ldr ip, [pc, #0] */
+ ARM_INSN(0xe08cf00f), /* add pc, ip, pc */
+ DATA_WORD(0, R_ARM_REL32, -4), /* dcd R_ARM_REL32(X) */
+ };
+
+/* Thumb -> Thumb long branch stub, PIC. Used on architectures which
+ support only this mode, or on V4T where it is expensive to switch
+ to ARM. */
+static const insn_sequence elf32_arm_stub_long_branch_thumb_only_pic[] =
+ {
+ THUMB16_INSN(0xb401), /* push {r0} */
+ THUMB16_INSN(0x4802), /* ldr r0, [pc, #8] */
+ THUMB16_INSN(0x46fc), /* mov ip, pc */
+ THUMB16_INSN(0x4484), /* add ip, r0 */
+ THUMB16_INSN(0xbc01), /* pop {r0} */
+ THUMB16_INSN(0x4760), /* bx ip */
+ DATA_WORD(0, R_ARM_REL32, 4), /* dcd R_ARM_REL32(X) */
+ };
+
/* Section name for stubs is the associated section name plus this
string. */
#define STUB_SUFFIX ".stub"
@@ -2124,6 +2150,9 @@ enum elf32_arm_stub_type
arm_stub_short_branch_v4t_thumb_arm,
arm_stub_long_branch_any_arm_pic,
arm_stub_long_branch_any_thumb_pic,
+ arm_stub_long_branch_v4t_arm_thumb_pic,
+ arm_stub_long_branch_v4t_thumb_arm_pic,
+ arm_stub_long_branch_thumb_only_pic,
};
struct elf32_arm_stub_hash_entry
@@ -2796,6 +2825,8 @@ arm_stub_is_thumb (enum elf32_arm_stub_type stub_type)
case arm_stub_long_branch_thumb_only:
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:
+ case arm_stub_long_branch_thumb_only_pic:
return TRUE;
case arm_stub_none:
BFD_FAIL ();
@@ -2872,8 +2903,8 @@ arm_type_of_stub (struct bfd_link_info *info,
? ((globals->use_blx)
/* V5T and above. */
? arm_stub_long_branch_any_thumb_pic
- /* not yet supported on V4T. */
- : arm_stub_none)
+ /* On V4T, use Thumb code only. */
+ : arm_stub_long_branch_thumb_only_pic)
/* non-PIC stubs. */
: ((globals->use_blx)
@@ -2885,8 +2916,8 @@ arm_type_of_stub (struct bfd_link_info *info,
else
{
stub_type = (info->shared | globals->pic_veneer)
- /* PIC stub not yet supported on V4T. */
- ? arm_stub_none
+ /* PIC stub. */
+ ? arm_stub_long_branch_thumb_only_pic
/* non-PIC stub. */
: arm_stub_long_branch_thumb_only;
}
@@ -2909,8 +2940,8 @@ arm_type_of_stub (struct bfd_link_info *info,
? ((globals->use_blx)
/* V5T and above. */
? arm_stub_long_branch_any_arm_pic
- /* not yet supported on V4T. */
- : arm_stub_none)
+ /* V4T PIC stub. */
+ : arm_stub_long_branch_v4t_thumb_arm_pic)
/* non-PIC stubs. */
: ((globals->use_blx)
@@ -2951,7 +2982,12 @@ arm_type_of_stub (struct bfd_link_info *info,
{
stub_type = (info->shared | globals->pic_veneer)
/* PIC stubs. */
- ? arm_stub_long_branch_any_thumb_pic
+ ? ((globals->use_blx)
+ /* V5T and above. */
+ ? arm_stub_long_branch_any_thumb_pic
+ /* V4T stub. */
+ : arm_stub_long_branch_v4t_arm_thumb_pic)
+
/* non-PIC stubs. */
: ((globals->use_blx)
/* V5T and above. */
@@ -3207,7 +3243,7 @@ arm_build_one_stub (struct bfd_hash_entry *gen_entry,
put_arm_insn (globals, stub_bfd, template[i].data, loc + size);
/* Handle cases where the target is encoded within the
instruction. */
- if (template[i].reloc_type == R_ARM_JUMP24)
+ if (template[i].r_type == R_ARM_JUMP24)
{
stub_reloc_idx = i;
stub_reloc_offset = size;
@@ -3241,7 +3277,7 @@ arm_build_one_stub (struct bfd_hash_entry *gen_entry,
/* Assume there is one and only one entry to relocate in each stub. */
BFD_ASSERT (stub_reloc_idx != -1);
- _bfd_final_link_relocate (elf32_arm_howto_from_type (template[stub_reloc_idx].reloc_type),
+ _bfd_final_link_relocate (elf32_arm_howto_from_type (template[stub_reloc_idx].r_type),
stub_bfd, stub_sec, stub_sec->contents,
stub_entry->stub_offset + stub_reloc_offset,
sym_value, template[stub_reloc_idx].reloc_addend);
@@ -3271,32 +3307,43 @@ arm_size_one_stub (struct bfd_hash_entry *gen_entry,
{
case arm_stub_long_branch_any_any:
template = elf32_arm_stub_long_branch_any_any;
- template_size = sizeof (elf32_arm_stub_long_branch_any_any) / sizeof (insn_sequence);
-
+ template_size = ARRAY_SIZE (elf32_arm_stub_long_branch_any_any);
break;
case arm_stub_long_branch_v4t_arm_thumb:
template = elf32_arm_stub_long_branch_v4t_arm_thumb;
- template_size = sizeof (elf32_arm_stub_long_branch_v4t_arm_thumb) / sizeof (insn_sequence);
+ template_size = ARRAY_SIZE (elf32_arm_stub_long_branch_v4t_arm_thumb);
break;
case arm_stub_long_branch_thumb_only:
template = elf32_arm_stub_long_branch_thumb_only;
- template_size = sizeof (elf32_arm_stub_long_branch_thumb_only) / sizeof (insn_sequence);
+ template_size = ARRAY_SIZE (elf32_arm_stub_long_branch_thumb_only);
break;
case arm_stub_long_branch_v4t_thumb_arm:
template = elf32_arm_stub_long_branch_v4t_thumb_arm;
- template_size = sizeof (elf32_arm_stub_long_branch_v4t_thumb_arm) / sizeof (insn_sequence);
+ template_size = ARRAY_SIZE (elf32_arm_stub_long_branch_v4t_thumb_arm);
break;
case arm_stub_short_branch_v4t_thumb_arm:
template = elf32_arm_stub_short_branch_v4t_thumb_arm;
- template_size = sizeof (elf32_arm_stub_short_branch_v4t_thumb_arm) / sizeof (insn_sequence);
+ template_size = ARRAY_SIZE (elf32_arm_stub_short_branch_v4t_thumb_arm);
break;
case arm_stub_long_branch_any_arm_pic:
template = elf32_arm_stub_long_branch_any_arm_pic;
- template_size = sizeof (elf32_arm_stub_long_branch_any_arm_pic) / sizeof (insn_sequence);
+ template_size = ARRAY_SIZE (elf32_arm_stub_long_branch_any_arm_pic);
break;
case arm_stub_long_branch_any_thumb_pic:
template = elf32_arm_stub_long_branch_any_thumb_pic;
- template_size = sizeof (elf32_arm_stub_long_branch_any_thumb_pic) / sizeof (insn_sequence);
+ template_size = ARRAY_SIZE (elf32_arm_stub_long_branch_any_thumb_pic);
+ break;
+ case arm_stub_long_branch_v4t_arm_thumb_pic:
+ template = elf32_arm_stub_long_branch_v4t_arm_thumb_pic;
+ template_size = ARRAY_SIZE (elf32_arm_stub_long_branch_v4t_arm_thumb_pic);
+ break;
+ case arm_stub_long_branch_v4t_thumb_arm_pic:
+ template = elf32_arm_stub_long_branch_v4t_thumb_arm_pic;
+ template_size = ARRAY_SIZE (elf32_arm_stub_long_branch_v4t_thumb_arm_pic);
+ break;
+ case arm_stub_long_branch_thumb_only_pic:
+ template = elf32_arm_stub_long_branch_thumb_only_pic;
+ template_size = ARRAY_SIZE (elf32_arm_stub_long_branch_thumb_only_pic);
break;
default:
BFD_FAIL ();
@@ -4647,8 +4694,7 @@ bfd_elf32_arm_process_before_allocation (bfd *abfd,
/* This one is a call from arm code. We need to look up
the target of the call. If it is a thumb target, we
insert glue. */
- if (ELF_ST_TYPE (h->type) == STT_ARM_TFUNC
- && !(r_type == R_ARM_CALL && globals->use_blx))
+ if (ELF_ST_TYPE (h->type) == STT_ARM_TFUNC)
record_arm_to_thumb_glue (link_info, h);
break;
generated by cgit v1.1 at 2024-12-13 09:01:50 +0000