aboutsummaryrefslogtreecommitdiff
path: root/bfd/elf32-arm.c
diff options
context:
space:
mode:
Diffstat (limited to 'bfd/elf32-arm.c')
-rw-r--r--bfd/elf32-arm.c376
1 files changed, 208 insertions, 168 deletions
diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c
index 6cf3322..919d458 100644
--- a/bfd/elf32-arm.c
+++ b/bfd/elf32-arm.c
@@ -2010,63 +2010,92 @@ static const bfd_vma elf32_arm_symbian_plt_entry [] =
#define THM2_MAX_FWD_BRANCH_OFFSET (((1 << 24) - 2) + 4)
#define THM2_MAX_BWD_BRANCH_OFFSET (-(1 << 24) + 4)
+enum stub_insn_type
+ {
+ THUMB16_TYPE = 1,
+ THUMB32_TYPE,
+ ARM_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}
+#define ARM_REL_INSN(X, Z) {(X), ARM_TYPE, R_ARM_JUMP24, (Z)}
+#define DATA_WORD(X,Y,Z) {(X), DATA_TYPE, (Y), (Z)}
+
+typedef struct
+{
+ bfd_vma data;
+ enum stub_insn_type type;
+ enum stub_reloc_type reloc_type;
+ int reloc_addend;
+} insn_sequence;
+
/* Arm/Thumb -> Arm/Thumb long branch stub. On V5T and above, use blx
to reach the stub if necessary. */
-static const bfd_vma elf32_arm_stub_long_branch_any_any[] =
+static const insn_sequence elf32_arm_stub_long_branch_any_any[] =
{
- 0xe51ff004, /* ldr pc, [pc, #-4] */
- 0x00000000, /* dcd R_ARM_ABS32(X) */
+ ARM_INSN(0xe51ff004), /* ldr pc, [pc, #-4] */
+ DATA_WORD(0, R_ARM_ABS32, 0), /* dcd R_ARM_ABS32(X) */
};
/* V4T Arm -> Thumb long branch stub. Used on V4T where blx is not
available. */
-static const bfd_vma elf32_arm_stub_long_branch_v4t_arm_thumb[] =
+static const insn_sequence elf32_arm_stub_long_branch_v4t_arm_thumb[] =
{
- 0xe59fc000, /* ldr ip, [pc, #0] */
- 0xe12fff1c, /* bx ip */
- 0x00000000, /* dcd R_ARM_ABS32(X) */
+ ARM_INSN(0xe59fc000), /* ldr ip, [pc, #0] */
+ ARM_INSN(0xe12fff1c), /* bx ip */
+ DATA_WORD(0, R_ARM_ABS32, 0), /* dcd R_ARM_ABS32(X) */
};
/* Thumb -> Thumb long branch stub. Used on architectures which
support only this mode, or on V4T where it is expensive to switch
to ARM. */
-static const bfd_vma elf32_arm_stub_long_branch_thumb_only[] =
+static const insn_sequence elf32_arm_stub_long_branch_thumb_only[] =
{
- 0x4802b401, /* push {r0} */
- /* ldr r0, [pc, #8] */
- 0xbc014684, /* mov ip, r0 */
- /* pop {r0} */
- 0xbf004760, /* bx ip */
- /* nop */
- 0x00000000, /* dcd R_ARM_ABS32(X) */
+ THUMB16_INSN(0xb401), /* push {r0} */
+ THUMB16_INSN(0x4802), /* ldr r0, [pc, #8] */
+ THUMB16_INSN(0x4684), /* mov ip, r0 */
+ THUMB16_INSN(0xbc01), /* pop {r0} */
+ THUMB16_INSN(0x4760), /* bx ip */
+ THUMB16_INSN(0xbf00), /* nop */
+ DATA_WORD(0, R_ARM_ABS32, 0), /* dcd R_ARM_ABS32(X) */
};
/* V4T Thumb -> ARM long branch stub. Used on V4T where blx is not
available. */
-static const bfd_vma elf32_arm_stub_long_branch_v4t_thumb_arm[] =
+static const insn_sequence elf32_arm_stub_long_branch_v4t_thumb_arm[] =
{
- 0x46c04778, /* bx pc */
- /* nop */
- 0xe51ff004, /* ldr pc, [pc, #-4] */
- 0x00000000, /* dcd R_ARM_ABS32(X) */
+ THUMB16_INSN(0x4778), /* bx pc */
+ THUMB16_INSN(0x46c0), /* nop */
+ ARM_INSN(0xe51ff004), /* ldr pc, [pc, #-4] */
+ DATA_WORD(0, R_ARM_ABS32, 0), /* dcd R_ARM_ABS32(X) */
};
/* V4T Thumb -> ARM short branch stub. Shorter variant of the above
one, when the destination is close enough. */
-static const bfd_vma elf32_arm_stub_short_branch_v4t_thumb_arm[] =
+static const insn_sequence elf32_arm_stub_short_branch_v4t_thumb_arm[] =
{
- 0x46c04778, /* bx pc */
- /* nop */
- 0xea000000, /* b (X) */
+ THUMB16_INSN(0x4778), /* bx pc */
+ THUMB16_INSN(0x46c0), /* nop */
+ ARM_REL_INSN(0xea000000, -8), /* b (X-8) */
};
/* ARM/Thumb -> ARM/Thumb long branch stub, PIC. On V5T and above, use
blx to reach the stub if necessary. */
-static const bfd_vma elf32_arm_stub_long_branch_any_any_pic[] =
+static const insn_sequence elf32_arm_stub_long_branch_any_any_pic[] =
{
- 0xe59fc000, /* ldr r12, [pc] */
- 0xe08ff00c, /* add pc, pc, ip */
- 0x00000000, /* dcd R_ARM_REL32(X-4) */
+ ARM_INSN(0xe59fc000), /* ldr r12, [pc] */
+ ARM_INSN(0xe08ff00c), /* add pc, pc, ip */
+ DATA_WORD(0, R_ARM_REL32, -4), /* dcd R_ARM_REL32(X-4) */
};
/* Section name for stubs is the associated section name plus this
@@ -2100,7 +2129,14 @@ struct elf32_arm_stub_hash_entry
bfd_vma target_value;
asection *target_section;
+ /* The stub type. */
enum elf32_arm_stub_type stub_type;
+ /* Its encoding size in bytes. */
+ int stub_size;
+ /* Its template. */
+ const insn_sequence *stub_template;
+ /* The size of the template (number of entries). */
+ int stub_template_size;
/* The symbol table entry, if any, that this was derived from. */
struct elf32_arm_link_hash_entry *h;
@@ -2469,6 +2505,9 @@ stub_hash_newfunc (struct bfd_hash_entry *entry,
eh->target_value = 0;
eh->target_section = NULL;
eh->stub_type = arm_stub_none;
+ eh->stub_size = 0;
+ eh->stub_template = NULL;
+ eh->stub_template_size = 0;
eh->h = NULL;
eh->id_sec = NULL;
}
@@ -3108,9 +3147,11 @@ arm_build_one_stub (struct bfd_hash_entry *gen_entry,
bfd_vma sym_value;
int template_size;
int size;
- const bfd_vma *template;
+ const insn_sequence *template;
int i;
struct elf32_arm_link_hash_table * globals;
+ int stub_reloc_idx = -1;
+ int stub_reloc_offset;
/* Massage our args to the form they really have. */
stub_entry = (struct elf32_arm_stub_hash_entry *) gen_entry;
@@ -3136,101 +3177,61 @@ arm_build_one_stub (struct bfd_hash_entry *gen_entry,
+ stub_entry->target_section->output_offset
+ stub_entry->target_section->output_section->vma);
- switch (stub_entry->stub_type)
- {
- 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 (bfd_vma)) * 4;
- 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 (bfd_vma)) * 4;
- 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 (bfd_vma)) * 4;
- 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 (bfd_vma)) * 4;
- 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 (bfd_vma)) * 4;
- break;
- case arm_stub_long_branch_any_any_pic:
- template = elf32_arm_stub_long_branch_any_any_pic;
- template_size = (sizeof (elf32_arm_stub_long_branch_any_any_pic) / sizeof (bfd_vma)) * 4;
- break;
- default:
- BFD_FAIL ();
- return FALSE;
- }
+ template = stub_entry->stub_template;
+ template_size = stub_entry->stub_template_size;
size = 0;
- for (i = 0; i < (template_size / 4); i++)
+ for (i = 0; i < template_size; i++)
{
- /* A 0 pattern is a placeholder, every other pattern is an
- instruction. */
- if (template[i] != 0)
- put_arm_insn (globals, stub_bfd, template[i], loc + size);
- else
- bfd_put_32 (stub_bfd, template[i], loc + size);
+ switch(template[i].type)
+ {
+ case THUMB16_TYPE:
+ put_thumb_insn (globals, stub_bfd, template[i].data, loc + size);
+ size += 2;
+ break;
- size += 4;
+ case ARM_TYPE:
+ 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)
+ {
+ stub_reloc_idx = i;
+ stub_reloc_offset = size;
+ }
+ size += 4;
+ break;
+
+ case DATA_TYPE:
+ bfd_put_32 (stub_bfd, template[i].data, loc + size);
+ stub_reloc_idx = i;
+ stub_reloc_offset = size;
+ size += 4;
+ break;
+
+ default:
+ BFD_FAIL ();
+ return FALSE;
+ }
}
+
stub_sec->size += size;
+ /* Stub size has already been computed in arm_size_one_stub. Check
+ consistency. */
+ BFD_ASSERT (size == stub_entry->stub_size);
+
/* Destination is Thumb. Force bit 0 to 1 to reflect this. */
if (stub_entry->st_type == STT_ARM_TFUNC)
sym_value |= 1;
- switch (stub_entry->stub_type)
- {
- case arm_stub_long_branch_any_any:
- _bfd_final_link_relocate (elf32_arm_howto_from_type (R_ARM_ABS32),
- stub_bfd, stub_sec, stub_sec->contents,
- stub_entry->stub_offset + 4, sym_value, 0);
- break;
- case arm_stub_long_branch_v4t_arm_thumb:
- _bfd_final_link_relocate (elf32_arm_howto_from_type (R_ARM_ABS32),
- stub_bfd, stub_sec, stub_sec->contents,
- stub_entry->stub_offset + 8, sym_value, 0);
- break;
- case arm_stub_long_branch_thumb_only:
- _bfd_final_link_relocate (elf32_arm_howto_from_type (R_ARM_ABS32),
- stub_bfd, stub_sec, stub_sec->contents,
- stub_entry->stub_offset + 12, sym_value, 0);
- break;
- case arm_stub_long_branch_v4t_thumb_arm:
- _bfd_final_link_relocate (elf32_arm_howto_from_type (R_ARM_ABS32),
- stub_bfd, stub_sec, stub_sec->contents,
- stub_entry->stub_offset + 8, sym_value, 0);
- break;
- case arm_stub_short_branch_v4t_thumb_arm:
- {
- long int rel_offset;
- static const insn32 t2a3_b_insn = 0xea000000;
-
- rel_offset = sym_value - (stub_addr + 8 + 4);
+ /* Assume there is one and only one entry to relocate in each stub. */
+ BFD_ASSERT (stub_reloc_idx != -1);
- put_arm_insn (globals, stub_bfd,
- (bfd_vma) t2a3_b_insn | ((rel_offset >> 2) & 0x00FFFFFF),
- loc + 4);
- }
- break;
-
- case arm_stub_long_branch_any_any_pic:
- /* We want the value relative to the address 8 bytes from the
- start of the stub. */
- _bfd_final_link_relocate (elf32_arm_howto_from_type (R_ARM_REL32),
- stub_bfd, stub_sec, stub_sec->contents,
- stub_entry->stub_offset + 8, sym_value, -4);
- break;
- default:
- BFD_FAIL();
- break;
- }
+ _bfd_final_link_relocate (elf32_arm_howto_from_type (template[stub_reloc_idx].reloc_type),
+ stub_bfd, stub_sec, stub_sec->contents,
+ stub_entry->stub_offset + stub_reloc_offset,
+ sym_value, template[stub_reloc_idx].reloc_addend);
return TRUE;
}
@@ -3244,7 +3245,7 @@ arm_size_one_stub (struct bfd_hash_entry *gen_entry,
{
struct elf32_arm_stub_hash_entry *stub_entry;
struct elf32_arm_link_hash_table *htab;
- const bfd_vma *template;
+ const insn_sequence *template;
int template_size;
int size;
int i;
@@ -3257,27 +3258,28 @@ 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 (bfd_vma)) * 4;
+ template_size = sizeof (elf32_arm_stub_long_branch_any_any) / sizeof (insn_sequence);
+
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 (bfd_vma)) * 4;
+ template_size = sizeof (elf32_arm_stub_long_branch_v4t_arm_thumb) / sizeof (insn_sequence);
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 (bfd_vma)) * 4;
+ template_size = sizeof (elf32_arm_stub_long_branch_thumb_only) / sizeof (insn_sequence);
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 (bfd_vma)) * 4;
+ template_size = sizeof (elf32_arm_stub_long_branch_v4t_thumb_arm) / sizeof (insn_sequence);
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 (bfd_vma)) * 4;
+ template_size = sizeof (elf32_arm_stub_short_branch_v4t_thumb_arm) / sizeof (insn_sequence);
break;
case arm_stub_long_branch_any_any_pic:
template = elf32_arm_stub_long_branch_any_any_pic;
- template_size = (sizeof (elf32_arm_stub_long_branch_any_any_pic) / sizeof (bfd_vma)) * 4;
+ template_size = sizeof (elf32_arm_stub_long_branch_any_any_pic) / sizeof (insn_sequence);
break;
default:
BFD_FAIL ();
@@ -3286,10 +3288,35 @@ arm_size_one_stub (struct bfd_hash_entry *gen_entry,
}
size = 0;
- for (i = 0; i < (template_size / 4); i++)
- size += 4;
+ for (i = 0; i < template_size; i++)
+ {
+ switch(template[i].type)
+ {
+ case THUMB16_TYPE:
+ size += 2;
+ break;
+
+ case ARM_TYPE:
+ size += 4;
+ break;
+
+ case DATA_TYPE:
+ size += 4;
+ break;
+
+ default:
+ BFD_FAIL ();
+ return FALSE;
+ }
+ }
+
+ stub_entry->stub_size = size;
+ stub_entry->stub_template = template;
+ stub_entry->stub_template_size = template_size;
+
size = (size + 7) & ~7;
stub_entry->stub_sec->size += size;
+
return TRUE;
}
@@ -11665,6 +11692,11 @@ arm_map_one_stub (struct bfd_hash_entry * gen_entry,
bfd_vma addr;
char *stub_name;
output_arch_syminfo *osi;
+ const insn_sequence *template;
+ enum stub_insn_type prev_type;
+ int size;
+ int i;
+ enum map_symbol_type sym_type;
/* Massage our args to the form they really have. */
stub_entry = (struct elf32_arm_stub_hash_entry *) gen_entry;
@@ -11683,62 +11715,70 @@ arm_map_one_stub (struct bfd_hash_entry * gen_entry,
addr = (bfd_vma) stub_entry->stub_offset;
stub_name = stub_entry->output_name;
- switch (stub_entry->stub_type)
+ template = stub_entry->stub_template;
+ switch(template[0].type)
{
- case arm_stub_long_branch_any_any:
- if (!elf32_arm_output_stub_sym (osi, stub_name, addr, 8))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 4))
- return FALSE;
- break;
- case arm_stub_long_branch_v4t_arm_thumb:
- if (!elf32_arm_output_stub_sym (osi, stub_name, addr, 12))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 8))
+ case ARM_TYPE:
+ if (!elf32_arm_output_stub_sym (osi, stub_name, addr, stub_entry->stub_size))
return FALSE;
break;
- case arm_stub_long_branch_thumb_only:
- if (!elf32_arm_output_stub_sym (osi, stub_name, addr | 1, 16))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_THUMB, addr))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 12))
- return FALSE;
- break;
- case arm_stub_long_branch_v4t_thumb_arm:
- if (!elf32_arm_output_stub_sym (osi, stub_name, addr | 1, 20))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_THUMB, addr))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr + 4))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 8))
- return FALSE;
- break;
- case arm_stub_short_branch_v4t_thumb_arm:
- if (!elf32_arm_output_stub_sym (osi, stub_name, addr | 1, 8))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_THUMB, addr))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr + 4))
- return FALSE;
- break;
- case arm_stub_long_branch_any_any_pic:
- if (!elf32_arm_output_stub_sym (osi, stub_name, addr, 12))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr))
- return FALSE;
- if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 8))
+ case THUMB16_TYPE:
+ if (!elf32_arm_output_stub_sym (osi, stub_name, addr | 1,
+ stub_entry->stub_size))
return FALSE;
break;
default:
BFD_FAIL ();
}
+ prev_type = DATA_TYPE;
+ size = 0;
+ for (i = 0; i < stub_entry->stub_template_size; i++)
+ {
+ switch(template[i].type)
+ {
+ case ARM_TYPE:
+ sym_type = ARM_MAP_ARM;
+ break;
+
+ case THUMB16_TYPE:
+ sym_type = ARM_MAP_THUMB;
+ break;
+
+ case DATA_TYPE:
+ sym_type = ARM_MAP_DATA;
+ break;
+
+ default:
+ BFD_FAIL ();
+ }
+
+ if (template[i].type != prev_type)
+ {
+ prev_type = template[i].type;
+ if (!elf32_arm_output_map_sym (osi, sym_type, addr + size))
+ return FALSE;
+ }
+
+ switch(template[i].type)
+ {
+ case ARM_TYPE:
+ size += 4;
+ break;
+
+ case THUMB16_TYPE:
+ size += 2;
+ break;
+
+ case DATA_TYPE:
+ size += 4;
+ break;
+
+ default:
+ BFD_FAIL ();
+ }
+ }
+
return TRUE;
}
generated by cgit v1.1 at 2024-12-26 10:10:38 +0000