/* ft32-specific support for 32-bit ELF.
- Copyright (C) 2013-2016 Free Software Foundation, Inc.
+ Copyright (C) 2013-2020 Free Software Foundation, Inc.
Copied from elf32-moxie.c which is..
- Copyright (C) 2009-2016 Free Software Foundation, Inc.
+ Copyright (C) 2009-2020 Free Software Foundation, Inc.
Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/ft32.h"
+#include "opcode/ft32.h"
-/* Forward declarations. */
+static bfd_boolean debug_relax = FALSE;
+
+static bfd_reloc_status_type
+bfd_elf_ft32_diff_reloc (bfd *, arelent *, asymbol *, void *,
+ asection *, bfd *, char **);
static reloc_howto_type ft32_elf_howto_table [] =
{
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
+ complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_FT32_16", /* name */
FALSE, /* partial_inplace */
10, /* bitsize */
FALSE, /* pc_relative */
4, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
+ complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_FT32_10", /* name */
FALSE, /* partial_inplace */
18, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
+ complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_FT32_18", /* name */
- FALSE, /* partial_inplace */
+ FALSE, /* partial_inplace */
0x00000000, /* src_mask */
0x0003ffff, /* dst_mask */
FALSE), /* pcrel_offset */
+ HOWTO (R_FT32_RELAX, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 10, /* bitsize */
+ FALSE, /* pc_relative */
+ 4, /* bitpos */
+ complain_overflow_signed, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_FT32_RELAX", /* name */
+ FALSE, /* partial_inplace */
+ 0x00000000, /* src_mask */
+ 0x00000000, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ HOWTO (R_FT32_SC0, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 10, /* bitsize */
+ FALSE, /* pc_relative */
+ 4, /* bitpos */
+ complain_overflow_signed, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_FT32_SC0", /* name */
+ FALSE, /* partial_inplace */
+ 0x00000000, /* src_mask */
+ 0x00000000, /* dst_mask */
+ FALSE), /* pcrel_offset */
+ HOWTO (R_FT32_SC1, /* type */
+ 2, /* rightshift */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
+ 22, /* bitsize */
+ TRUE, /* pc_relative */
+ 7, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_FT32_SC1", /* name */
+ TRUE, /* partial_inplace */
+ 0x07ffff80, /* src_mask */
+ 0x07ffff80, /* dst_mask */
+ FALSE), /* pcrel_offset */
+ HOWTO (R_FT32_15, /* type */
+ 0, /* rightshift */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
+ 15, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_FT32_15", /* name */
+ FALSE, /* partial_inplace */
+ 0x00000000, /* src_mask */
+ 0x00007fff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+ HOWTO (R_FT32_DIFF32, /* type */
+ 0, /* rightshift */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
+ 32, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ bfd_elf_ft32_diff_reloc, /* special_function */
+ "R_FT32_DIFF32", /* name */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
+ 0xffffffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
};
\f
+\f
/* Map BFD reloc types to FT32 ELF reloc types. */
struct ft32_reloc_map
static const struct ft32_reloc_map ft32_reloc_map [] =
{
- { BFD_RELOC_NONE, R_FT32_NONE },
- { BFD_RELOC_32, R_FT32_20 },
- { BFD_RELOC_16, R_FT32_16 },
- { BFD_RELOC_8, R_FT32_8 },
- { BFD_RELOC_FT32_10, R_FT32_10 },
- { BFD_RELOC_FT32_20, R_FT32_20 },
- { BFD_RELOC_FT32_17, R_FT32_17 },
- { BFD_RELOC_FT32_18, R_FT32_18 },
+ { BFD_RELOC_NONE, R_FT32_NONE },
+ { BFD_RELOC_32, R_FT32_32 },
+ { BFD_RELOC_16, R_FT32_16 },
+ { BFD_RELOC_8, R_FT32_8 },
+ { BFD_RELOC_FT32_10, R_FT32_10 },
+ { BFD_RELOC_FT32_20, R_FT32_20 },
+ { BFD_RELOC_FT32_17, R_FT32_17 },
+ { BFD_RELOC_FT32_18, R_FT32_18 },
+ { BFD_RELOC_FT32_RELAX, R_FT32_RELAX },
+ { BFD_RELOC_FT32_SC0, R_FT32_SC0 },
+ { BFD_RELOC_FT32_SC1, R_FT32_SC1 },
+ { BFD_RELOC_FT32_15, R_FT32_15 },
+ { BFD_RELOC_FT32_DIFF32, R_FT32_DIFF32 },
};
+/* Perform a diff relocation. Nothing to do, as the difference value is
+ already written into the section's contents. */
+
+static bfd_reloc_status_type
+bfd_elf_ft32_diff_reloc (bfd *abfd ATTRIBUTE_UNUSED,
+ arelent *reloc_entry ATTRIBUTE_UNUSED,
+ asymbol *symbol ATTRIBUTE_UNUSED,
+ void *data ATTRIBUTE_UNUSED,
+ asection *input_section ATTRIBUTE_UNUSED,
+ bfd *output_bfd ATTRIBUTE_UNUSED,
+ char **error_message ATTRIBUTE_UNUSED)
+{
+ return bfd_reloc_ok;
+}
+
static reloc_howto_type *
ft32_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
/* Set the howto pointer for an FT32 ELF reloc. */
-static void
-ft32_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
+static bfd_boolean
+ft32_info_to_howto_rela (bfd *abfd,
arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned int r_type;
r_type = ELF32_R_TYPE (dst->r_info);
- BFD_ASSERT (r_type < (unsigned int) R_FT32_max);
+ if (r_type >= (unsigned int) R_FT32_max)
+ {
+ /* xgettext:c-format */
+ _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
+ abfd, r_type);
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
+
cache_ptr->howto = & ft32_elf_howto_table [r_type];
+ return cache_ptr->howto != NULL;
}
-\f
+
/* Relocate an FT32 ELF section.
The RELOCATE_SECTION function is called by the new ELF backend linker
name = bfd_elf_string_from_elf_section
(input_bfd, symtab_hdr->sh_link, sym->st_name);
- name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
+ name = name == NULL ? bfd_section_name (sec) : name;
}
else
{
if (bfd_link_relocatable (info))
continue;
- r = _bfd_final_link_relocate (howto, input_bfd, input_section,
- contents, rel->r_offset,
- relocation, rel->r_addend);
+ switch (howto->type)
+ {
+ case R_FT32_SC0:
+ {
+ unsigned int insn;
+ int offset;
+ unsigned int code15[2];
+
+ insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
+ ft32_split_shortcode (insn, code15);
+
+ offset = (int)relocation;
+ offset += (int)(rel->r_addend - rel->r_offset);
+ offset -= (input_section->output_section->vma +
+ input_section->output_offset);
+ if ((offset < -1024) || (offset >= 1024))
+ {
+ r = bfd_reloc_outofrange;
+ break;
+ }
+ code15[0] |= ((offset / 4) & 511);
+ insn = ft32_merge_shortcode (code15);
+ bfd_put_32 (input_bfd, insn, contents + rel->r_offset);
+ }
+ r = bfd_reloc_ok;
+ break;
+
+ case R_FT32_SC1:
+ {
+ unsigned int insn;
+ int offset;
+ unsigned int code15[2];
+
+ insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
+ ft32_split_shortcode (insn, code15);
+
+ offset = (int)relocation;
+ offset += (int)(rel->r_addend - rel->r_offset);
+ offset -= (input_section->output_section->vma +
+ input_section->output_offset);
+ if ((offset < -1024) || (offset >= 1024))
+ {
+ r = bfd_reloc_outofrange;
+ break;
+ }
+ code15[1] |= ((offset / 4) & 511);
+ insn = ft32_merge_shortcode (code15);
+ bfd_put_32 (input_bfd, insn, contents + rel->r_offset);
+ }
+ r = bfd_reloc_ok;
+ break;
+
+ case R_FT32_DIFF32:
+ r = bfd_reloc_ok;
+ break;
+
+ default:
+ r = _bfd_final_link_relocate (howto, input_bfd, input_section,
+ contents, rel->r_offset,
+ relocation, rel->r_addend);
+ break;
+ }
if (r != bfd_reloc_ok)
{
return TRUE;
}
\f
+/* Relaxation. */
+
+static bfd_boolean
+ft32_reloc_shortable
+ (bfd * abfd,
+ asection * sec,
+ Elf_Internal_Sym * isymbuf ATTRIBUTE_UNUSED,
+ bfd_byte * contents,
+ bfd_vma pc ATTRIBUTE_UNUSED,
+ Elf_Internal_Rela * irel,
+ unsigned int * sc)
+{
+ Elf_Internal_Shdr *symtab_hdr ATTRIBUTE_UNUSED;
+ bfd_vma symval;
+
+ enum elf_ft32_reloc_type r_type;
+ reloc_howto_type *howto = NULL;
+ unsigned int insn;
+ int offset;
+ bfd_vma dot, value;
+
+ r_type = ELF32_R_TYPE (irel->r_info);
+ howto = &ft32_elf_howto_table [r_type];
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+
+ /* Get the value of the symbol referred to by the reloc. */
+ if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
+ {
+ /* A local symbol. */
+ Elf_Internal_Sym *isym;
+ asection *sym_sec;
+
+ isym = isymbuf + ELF32_R_SYM (irel->r_info);
+ sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
+ symval = isym->st_value;
+ /* If the reloc is absolute, it will not have
+ a symbol or section associated with it. */
+ if (sym_sec)
+ symval += sym_sec->output_section->vma
+ + sym_sec->output_offset;
+ }
+ else
+ {
+ unsigned long indx;
+ struct elf_link_hash_entry *h;
+
+ /* An external symbol. */
+ indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
+ h = elf_sym_hashes (abfd)[indx];
+ BFD_ASSERT (h != NULL);
+ if (h->root.type != bfd_link_hash_defined
+ && h->root.type != bfd_link_hash_defweak)
+ /* This appears to be a reference to an undefined
+ symbol. Just ignore it--it will be caught by the
+ regular reloc processing. */
+ return FALSE;
+
+ symval = (h->root.u.def.value
+ + h->root.u.def.section->output_section->vma
+ + h->root.u.def.section->output_offset);
+ }
+
+ switch (r_type)
+ {
+ case R_FT32_8:
+ case R_FT32_10:
+ case R_FT32_16:
+ case R_FT32_20:
+ case R_FT32_RELAX:
+ if (symval != 0)
+ return FALSE;
+ insn = bfd_get_32 (abfd, contents + irel->r_offset);
+ insn |= ((symval + irel->r_addend) << howto->bitpos) & howto->dst_mask;
+ return ft32_shortcode (insn, sc);
+
+ case R_FT32_18:
+ insn = bfd_get_32 (abfd, contents + irel->r_offset);
+ /* Get the address of this instruction. */
+ dot = (sec->output_section->vma
+ + sec->output_offset + irel->r_offset);
+ value = symval + irel->r_addend;
+ offset = (value - dot) / 4;
+
+ if ((dot > 0x8c) && (-256 <= offset) && (offset < 256))
+ {
+ switch (insn)
+ {
+ case 0x00200000: *sc = (3 << 13) | (0 << 9); return TRUE;
+ case 0x00280000: *sc = (3 << 13) | (1 << 9); return TRUE;
+ case 0x00600000: *sc = (3 << 13) | (2 << 9); return TRUE;
+ case 0x00680000: *sc = (3 << 13) | (3 << 9); return TRUE;
+ case 0x00a00000: *sc = (3 << 13) | (4 << 9); return TRUE;
+ case 0x00a80000: *sc = (3 << 13) | (5 << 9); return TRUE;
+ case 0x00e00000: *sc = (3 << 13) | (6 << 9); return TRUE;
+ case 0x00e80000: *sc = (3 << 13) | (7 << 9); return TRUE;
+ case 0x01200000: *sc = (3 << 13) | (8 << 9); return TRUE;
+ case 0x01280000: *sc = (3 << 13) | (9 << 9); return TRUE;
+ case 0x01600000: *sc = (3 << 13) | (10 << 9); return TRUE;
+ case 0x01680000: *sc = (3 << 13) | (11 << 9); return TRUE;
+ case 0x01a00000: *sc = (3 << 13) | (12 << 9); return TRUE;
+ case 0x01a80000: *sc = (3 << 13) | (13 << 9); return TRUE;
+
+ case 0x00300000: *sc = (3 << 13) | (14 << 9); return TRUE;
+ case 0x00340000: *sc = (3 << 13) | (15 << 9); return TRUE;
+
+ default:
+ break;
+ }
+ }
+ break;
+
+ default:
+ break;
+ }
+ return FALSE;
+}
+
+/* Returns whether the relocation type passed is a diff reloc. */
+
+static bfd_boolean
+elf32_ft32_is_diff_reloc (Elf_Internal_Rela *irel)
+{
+ return (ELF32_R_TYPE (irel->r_info) == R_FT32_DIFF32);
+}
+
+/* Reduce the diff value written in the section by count if the shrinked
+ insn address happens to fall between the two symbols for which this
+ diff reloc was emitted. */
+
+static bfd_boolean
+elf32_ft32_adjust_diff_reloc_value (bfd *abfd,
+ struct bfd_section *isec,
+ Elf_Internal_Rela *irel,
+ bfd_vma symval,
+ bfd_vma shrinked_insn_address,
+ int count)
+{
+ unsigned char * reloc_contents = NULL;
+ unsigned char * isec_contents = elf_section_data (isec)->this_hdr.contents;
+ bfd_signed_vma x = 0;
+ bfd_vma sym2_address;
+ bfd_vma sym1_address;
+ bfd_vma start_address;
+ bfd_vma end_address;
+
+
+ if (isec_contents == NULL)
+ {
+ if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents))
+ return FALSE;
+
+ elf_section_data (isec)->this_hdr.contents = isec_contents;
+ }
+
+ reloc_contents = isec_contents + irel->r_offset;
+
+ /* Read value written in object file. */
+ switch (ELF32_R_TYPE (irel->r_info))
+ {
+ case R_FT32_DIFF32:
+ x = bfd_get_signed_32 (abfd, reloc_contents);
+ break;
+
+ default:
+ return FALSE;
+ }
+
+ /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written
+ into the object file at the reloc offset. sym2's logical value is
+ symval (<start_of_section>) + reloc addend. Compute the start and end
+ addresses and check if the shrinked insn falls between sym1 and sym2. */
+ sym2_address = symval + irel->r_addend;
+ sym1_address = sym2_address - x;
+
+ /* Don't assume sym2 is bigger than sym1 - the difference
+ could be negative. Compute start and end addresses, and
+ use those to see if they span shrinked_insn_address. */
+ start_address = sym1_address < sym2_address ? sym1_address : sym2_address;
+ end_address = sym1_address > sym2_address ? sym1_address : sym2_address;
+
+ if (shrinked_insn_address >= start_address
+ && shrinked_insn_address < end_address)
+ {
+ /* Reduce the diff value by count bytes and write it back into section
+ contents. */
+ bfd_signed_vma new_diff = x < 0 ? x + count : x - count;
+
+ if (sym2_address > shrinked_insn_address)
+ irel->r_addend -= count;
+
+ switch (ELF32_R_TYPE (irel->r_info))
+ {
+ case R_FT32_DIFF32:
+ bfd_put_signed_32 (abfd, new_diff & 0xFFFFFFFF, reloc_contents);
+ break;
+
+ default:
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
+static bfd_boolean
+elf32_ft32_adjust_reloc_if_spans_insn (bfd *abfd,
+ asection *isec,
+ Elf_Internal_Rela *irel, bfd_vma symval,
+ bfd_vma shrinked_insn_address,
+ bfd_vma shrink_boundary,
+ int count)
+{
+
+ if (elf32_ft32_is_diff_reloc (irel))
+ {
+ if (!elf32_ft32_adjust_diff_reloc_value (abfd, isec, irel,
+ symval,
+ shrinked_insn_address,
+ count))
+ return FALSE;
+ }
+ else
+ {
+ bfd_vma reloc_value = symval + irel->r_addend;
+ bfd_boolean addend_within_shrink_boundary =
+ (reloc_value <= shrink_boundary);
+ bfd_boolean reloc_spans_insn =
+ (symval <= shrinked_insn_address
+ && reloc_value > shrinked_insn_address
+ && addend_within_shrink_boundary);
+
+ if (! reloc_spans_insn)
+ return TRUE;
+
+ irel->r_addend -= count;
+
+ if (debug_relax)
+ printf ("Relocation's addend needed to be fixed \n");
+ }
+ return TRUE;
+}
+
+/* Delete some bytes from a section while relaxing. */
+
+static bfd_boolean
+elf32_ft32_relax_delete_bytes (struct bfd_link_info *link_info, bfd * abfd,
+ asection * sec, bfd_vma addr, int count)
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ unsigned int sec_shndx;
+ bfd_byte *contents;
+ Elf_Internal_Rela *irel, *irelend;
+ bfd_vma toaddr;
+ Elf_Internal_Sym *isym;
+ Elf_Internal_Sym *isymend;
+ struct elf_link_hash_entry **sym_hashes;
+ struct elf_link_hash_entry **end_hashes;
+ struct elf_link_hash_entry **start_hashes;
+ unsigned int symcount;
+ Elf_Internal_Sym *isymbuf = NULL;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
+
+ contents = elf_section_data (sec)->this_hdr.contents;
+
+ toaddr = sec->size;
+
+ irel = elf_section_data (sec)->relocs;
+ irelend = irel + sec->reloc_count;
+
+ /* Actually delete the bytes. */
+ memmove (contents + addr, contents + addr + count,
+ (size_t) (toaddr - addr - count));
+ sec->size -= count;
+
+ /* Adjust all the relocs. */
+ for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
+ /* Get the new reloc address. */
+ if ((irel->r_offset > addr && irel->r_offset < toaddr))
+ irel->r_offset -= count;
+
+ /* The reloc's own addresses are now ok. However, we need to readjust
+ the reloc's addend, i.e. the reloc's value if two conditions are met:
+ 1.) the reloc is relative to a symbol in this section that
+ is located in front of the shrinked instruction
+ 2.) symbol plus addend end up behind the shrinked instruction.
+
+ The most common case where this happens are relocs relative to
+ the section-start symbol.
+
+ This step needs to be done for all of the sections of the bfd. */
+ {
+ struct bfd_section *isec;
+
+ for (isec = abfd->sections; isec; isec = isec->next)
+ {
+ bfd_vma symval;
+ bfd_vma shrinked_insn_address;
+
+ if (isec->reloc_count == 0)
+ continue;
+
+ shrinked_insn_address = (sec->output_section->vma
+ + sec->output_offset + addr - count);
+
+ irel = elf_section_data (isec)->relocs;
+ /* PR 12161: Read in the relocs for this section if necessary. */
+ if (irel == NULL)
+ irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
+
+ for (irelend = irel + isec->reloc_count; irel < irelend; irel++)
+ {
+ /* Read this BFD's local symbols if we haven't done
+ so already. */
+ if (isymbuf == NULL && symtab_hdr->sh_info != 0)
+ {
+ isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
+ if (isymbuf == NULL)
+ isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
+ symtab_hdr->sh_info, 0,
+ NULL, NULL, NULL);
+ if (isymbuf == NULL)
+ return FALSE;
+ }
+
+ /* Get the value of the symbol referred to by the reloc. */
+ if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
+ {
+ /* A local symbol. */
+ asection *sym_sec;
+
+ isym = isymbuf + ELF32_R_SYM (irel->r_info);
+ sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
+ symval = isym->st_value;
+ /* If the reloc is absolute, it will not have
+ a symbol or section associated with it. */
+ if (sym_sec == sec)
+ {
+ symval += sym_sec->output_section->vma
+ + sym_sec->output_offset;
+
+ if (debug_relax)
+ printf ("Checking if the relocation's "
+ "addend needs corrections.\n"
+ "Address of anchor symbol: 0x%x \n"
+ "Address of relocation target: 0x%x \n"
+ "Address of relaxed insn: 0x%x \n",
+ (unsigned int) symval,
+ (unsigned int) (symval + irel->r_addend),
+ (unsigned int) shrinked_insn_address);
+
+ if (symval <= shrinked_insn_address
+ && (symval + irel->r_addend) > shrinked_insn_address)
+ {
+ /* If there is an alignment boundary, we only need to
+ adjust addends that end up below the boundary. */
+ bfd_vma shrink_boundary = (toaddr
+ + sec->output_section->vma
+ + sec->output_offset);
+
+ if (debug_relax)
+ printf
+ ("Relocation's addend needed to be fixed \n");
+
+ if (!elf32_ft32_adjust_reloc_if_spans_insn (abfd, isec,
+ irel, symval,
+ shrinked_insn_address,
+ shrink_boundary,
+ count))
+ return FALSE;
+ }
+ }
+ /* else reference symbol is absolute. No adjustment needed. */
+ }
+ /* else...Reference symbol is extern. No need for adjusting
+ the addend. */
+ }
+ }
+ }
+
+ /* Adjust the local symbols defined in this section. */
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ isym = (Elf_Internal_Sym *) symtab_hdr->contents;
+ if (isym)
+ {
+ for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
+ {
+ if (isym->st_shndx == sec_shndx
+ && isym->st_value > addr && isym->st_value < toaddr)
+ isym->st_value -= count;
+ }
+ }
+
+ /* Now adjust the global symbols defined in this section. */
+ symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
+ - symtab_hdr->sh_info);
+ sym_hashes = start_hashes = elf_sym_hashes (abfd);
+ end_hashes = sym_hashes + symcount;
+
+ for (; sym_hashes < end_hashes; sym_hashes++)
+ {
+ struct elf_link_hash_entry *sym_hash = *sym_hashes;
+
+ /* The '--wrap SYMBOL' option is causing a pain when the object file,
+ containing the definition of __wrap_SYMBOL, includes a direct
+ call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
+ the same symbol (which is __wrap_SYMBOL), but still exist as two
+ different symbols in 'sym_hashes', we don't want to adjust
+ the global symbol __wrap_SYMBOL twice.
+ This check is only relevant when symbols are being wrapped. */
+ if (link_info->wrap_hash != NULL)
+ {
+ struct elf_link_hash_entry **cur_sym_hashes;
+
+ /* Loop only over the symbols whom been already checked. */
+ for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes;
+ cur_sym_hashes++)
+ /* If the current symbol is identical to 'sym_hash', that means
+ the symbol was already adjusted (or at least checked). */
+ if (*cur_sym_hashes == sym_hash)
+ break;
+
+ /* Don't adjust the symbol again. */
+ if (cur_sym_hashes < sym_hashes)
+ continue;
+ }
+
+ if ((sym_hash->root.type == bfd_link_hash_defined
+ || sym_hash->root.type == bfd_link_hash_defweak)
+ && sym_hash->root.u.def.section == sec
+ && sym_hash->root.u.def.value > addr
+ && sym_hash->root.u.def.value < toaddr)
+ sym_hash->root.u.def.value -= count;
+ }
+
+ return TRUE;
+}
+
+/* Return TRUE if LOC can be a target of a branch, jump or call. */
+
+static bfd_boolean
+elf32_ft32_relax_is_branch_target (struct bfd_link_info *link_info,
+ bfd * abfd, asection * sec,
+ bfd_vma loc)
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf_Internal_Rela *irel, *irelend;
+ Elf_Internal_Sym *isym;
+ Elf_Internal_Sym *isymbuf = NULL;
+ bfd_vma symval;
+ struct bfd_section *isec;
+
+ struct elf_link_hash_entry **sym_hashes;
+ struct elf_link_hash_entry **end_hashes;
+ struct elf_link_hash_entry **start_hashes;
+ unsigned int symcount;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+
+ /* Now we check for relocations pointing to ret. */
+ for (isec = abfd->sections; isec; isec = isec->next)
+ {
+ irel = elf_section_data (isec)->relocs;
+ if (irel == NULL)
+ irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
+
+ irelend = irel + isec->reloc_count;
+
+ for (; irel < irelend; irel++)
+ {
+ /* Read this BFD's local symbols if we haven't done
+ so already. */
+ if (isymbuf == NULL && symtab_hdr->sh_info != 0)
+ {
+ isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
+ if (isymbuf == NULL)
+ isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
+ symtab_hdr->sh_info, 0,
+ NULL, NULL, NULL);
+ if (isymbuf == NULL)
+ return FALSE;
+ }
+
+ /* Get the value of the symbol referred to by the reloc. */
+ if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
+ {
+ /* A local symbol. */
+ asection *sym_sec;
+
+ isym = isymbuf + ELF32_R_SYM (irel->r_info);
+ sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
+ symval = isym->st_value;
+ /* If the reloc is absolute, it will not have
+ a symbol or section associated with it. */
+ if (sym_sec == sec)
+ {
+ symval += sym_sec->output_section->vma
+ + sym_sec->output_offset;
+
+ if (debug_relax)
+ printf ("0x%x: Address of anchor symbol: 0x%x "
+ "Address of relocation target: 0x%x \n",
+ (unsigned int) irel->r_offset,
+ (unsigned int) symval,
+ (unsigned int) (symval + irel->r_addend));
+ if ((irel->r_addend) == loc)
+ return TRUE;
+ }
+ }
+ }
+ }
+
+ symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
+ - symtab_hdr->sh_info);
+ sym_hashes = start_hashes = elf_sym_hashes (abfd);
+ end_hashes = sym_hashes + symcount;
+
+ for (; sym_hashes < end_hashes; sym_hashes++)
+ {
+ struct elf_link_hash_entry *sym_hash = *sym_hashes;
+
+ /* The '--wrap SYMBOL' option is causing a pain when the object file,
+ containing the definition of __wrap_SYMBOL, includes a direct
+ call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
+ the same symbol (which is __wrap_SYMBOL), but still exist as two
+ different symbols in 'sym_hashes', we don't want to adjust
+ the global symbol __wrap_SYMBOL twice.
+ This check is only relevant when symbols are being wrapped. */
+ if (link_info->wrap_hash != NULL)
+ {
+ struct elf_link_hash_entry **cur_sym_hashes;
+
+ /* Loop only over the symbols whom been already checked. */
+ for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes;
+ cur_sym_hashes++)
+ /* If the current symbol is identical to 'sym_hash', that means
+ the symbol was already adjusted (or at least checked). */
+ if (*cur_sym_hashes == sym_hash)
+ break;
+
+ /* Don't adjust the symbol again. */
+ if (cur_sym_hashes < sym_hashes)
+ continue;
+ }
+
+ if ((sym_hash->root.type == bfd_link_hash_defined
+ || sym_hash->root.type == bfd_link_hash_defweak)
+ && sym_hash->root.u.def.section == sec
+ && sym_hash->root.u.def.value == loc)
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+static bfd_boolean
+ft32_elf_relax_section
+ (bfd * abfd,
+ asection * sec,
+ struct bfd_link_info * link_info,
+ bfd_boolean * again)
+{
+ Elf_Internal_Rela * free_relocs = NULL;
+ Elf_Internal_Rela * internal_relocs;
+ Elf_Internal_Rela * irelend;
+ Elf_Internal_Rela * irel;
+ bfd_byte * contents = NULL;
+ Elf_Internal_Shdr * symtab_hdr;
+ Elf_Internal_Sym * isymbuf = NULL;
+
+ /* Assume nothing changes. */
+ *again = FALSE;
+
+ /* We don't have to do anything for a relocatable link, if
+ this section does not have relocs, or if this is not a
+ code section. */
+ if (bfd_link_relocatable (link_info)
+ || (sec->flags & SEC_RELOC) == 0
+ || sec->reloc_count == 0
+ || (sec->flags & SEC_CODE) == 0)
+ return TRUE;
+
+ /* Get the section contents. */
+ if (elf_section_data (sec)->this_hdr.contents != NULL)
+ contents = elf_section_data (sec)->this_hdr.contents;
+ /* Go get them off disk. */
+ else
+ {
+ if (! bfd_malloc_and_get_section (abfd, sec, &contents))
+ goto error_return;
+ elf_section_data (sec)->this_hdr.contents = contents;
+ }
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+
+ /* Read this BFD's local symbols if we haven't done so already. */
+ if (isymbuf == NULL && symtab_hdr->sh_info != 0)
+ {
+ isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
+ if (isymbuf == NULL)
+ isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
+ symtab_hdr->sh_info, 0,
+ NULL, NULL, NULL);
+ if (isymbuf == NULL)
+ goto error_return;
+ symtab_hdr->contents = (unsigned char *) isymbuf;
+ }
+
+ internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
+ link_info->keep_memory);
+ if (internal_relocs == NULL)
+ goto error_return;
+ if (! link_info->keep_memory)
+ free_relocs = internal_relocs;
+
+ /* Walk through them looking for relaxing opportunities. */
+ irelend = internal_relocs + sec->reloc_count;
+
+ /* Test every adjacent pair of relocs. If both have shortcodes,
+ fuse them and delete the relocs. */
+ irel = internal_relocs;
+ while (irel < irelend - 1)
+ {
+ Elf_Internal_Rela * irel_next = irel + 1;
+ unsigned int sc0, sc1;
+ bfd_vma pc;
+
+ pc = irel->r_offset;
+
+ if (((pc + 4) == (irel_next->r_offset))
+ && ft32_reloc_shortable (abfd, sec, isymbuf, contents, pc, irel,
+ &sc0)
+ && ft32_reloc_shortable (abfd, sec, isymbuf, contents, pc,
+ irel_next, &sc1)
+ && !elf32_ft32_relax_is_branch_target (link_info, abfd, sec,
+ irel_next->r_offset))
+ {
+ unsigned int code30 = (sc1 << 15) | sc0;
+ unsigned int code27 = code30 >> 3;
+ unsigned int code3 = code30 & 7;
+ static const unsigned char pat3[] = {2, 3, 4, 5, 6, 9, 10, 14};
+ unsigned int pattern = pat3[code3];
+ unsigned int fused = (pattern << 27) | code27;
+
+ /* Move second reloc to same place as first. */
+ irel_next->r_offset = irel->r_offset;
+
+ /* Change both relocs to R_FT32_NONE. */
+
+ if (ELF32_R_TYPE (irel->r_info) == R_FT32_18)
+ {
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_FT32_SC0);
+ }
+ else
+ {
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_FT32_NONE);
+ }
+
+ if (ELF32_R_TYPE (irel_next->r_info) == R_FT32_18)
+ {
+ irel_next->r_info = ELF32_R_INFO (ELF32_R_SYM (irel_next->r_info),
+ R_FT32_SC1);
+ }
+ else
+ {
+ irel_next->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_FT32_NONE);
+ }
+
+ /* Replace the first insn with the fused version. */
+ bfd_put_32 (abfd, fused, contents + irel->r_offset);
+
+ /* Delete the second insn. */
+ if (!elf32_ft32_relax_delete_bytes (link_info, abfd, sec,
+ irel->r_offset + 4, 4))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = TRUE;
+
+ irel += 2;
+ }
+ else
+ {
+ irel += 1;
+ }
+ }
+
+ if (isymbuf != NULL
+ && symtab_hdr->contents != (unsigned char *) isymbuf)
+ {
+ if (! link_info->keep_memory)
+ free (isymbuf);
+ else
+ /* Cache the symbols for elf_link_input_bfd. */
+ symtab_hdr->contents = (unsigned char *) isymbuf;
+ }
+
+ if (contents != NULL
+ && elf_section_data (sec)->this_hdr.contents != contents)
+ {
+ if (! link_info->keep_memory)
+ free (contents);
+ else
+ /* Cache the section contents for elf_link_input_bfd. */
+ elf_section_data (sec)->this_hdr.contents = contents;
+
+ }
+
+ if (elf_section_data (sec)->relocs != internal_relocs)
+ free (internal_relocs);
+
+ return TRUE;
+
+ error_return:
+ free (free_relocs);
+
+ return TRUE;
+}
+\f
#define ELF_ARCH bfd_arch_ft32
#define ELF_MACHINE_CODE EM_FT32
#define ELF_MAXPAGESIZE 0x1
#define bfd_elf32_bfd_reloc_type_lookup ft32_reloc_type_lookup
#define bfd_elf32_bfd_reloc_name_lookup ft32_reloc_name_lookup
+#define bfd_elf32_bfd_relax_section ft32_elf_relax_section
+
#include "elf32-target.h"
projects / deliverable / binutils-gdb.git / blobdiff