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authorChris Demetriou <cgd@google.com>2002-01-30 02:19:21 +0000
committerChris Demetriou <cgd@google.com>2002-01-30 02:19:21 +0000
commit030d18fb6f4dac6bdf00486d835550b26709ba25 (patch)
treea8b560c2066bd5df7a40842da13748f57ccf9f09
parent4514d474edfcad976dc870d8e68c406f2a7b5e62 (diff)
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2002-01-29 Chris Demetriou <cgd@broadcom.com>
Mitch Lichtenberg <mpl@broadcom.com> * bfd-in.h (bfd_mips_elf32_create_embedded_relocs): New prototype. * elf32-mips.c (bfd_mips_elf32_create_embedded_relocs): New function to handle 32-bit ELF embedded reloc (ld --embedded-relocs) generation. * bfd-in2.h: Regenerate.
-rw-r--r--bfd/ChangeLog9
-rw-r--r--bfd/bfd-in.h3
-rw-r--r--bfd/bfd-in2.h3
-rw-r--r--bfd/elf32-mips.c175
4 files changed, 190 insertions, 0 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 7f6ee72..c9f4121 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,4 +1,13 @@
2002-01-29 Chris Demetriou <cgd@broadcom.com>
+ Mitch Lichtenberg <mpl@broadcom.com>
+
+ * bfd-in.h (bfd_mips_elf32_create_embedded_relocs): New prototype.
+ * elf32-mips.c (bfd_mips_elf32_create_embedded_relocs): New function
+ to handle 32-bit ELF embedded reloc (ld --embedded-relocs)
+ generation.
+ * bfd-in2.h: Regenerate.
+
+2002-01-29 Chris Demetriou <cgd@broadcom.com>
* elf32-mips.c: Add additional comments about HI16 relocation
processing.
diff --git a/bfd/bfd-in.h b/bfd/bfd-in.h
index c6f2b41..77a4abc 100644
--- a/bfd/bfd-in.h
+++ b/bfd/bfd-in.h
@@ -663,6 +663,9 @@ extern int bfd_get_sign_extend_vma PARAMS ((bfd *));
extern boolean bfd_m68k_elf32_create_embedded_relocs
PARAMS ((bfd *, struct bfd_link_info *, struct sec *, struct sec *,
char **));
+extern boolean bfd_mips_elf32_create_embedded_relocs
+ PARAMS ((bfd *, struct bfd_link_info *, struct sec *, struct sec *,
+ char **));
/* SunOS shared library support routines for the linker. */
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index e48a20d..990034e 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -669,6 +669,9 @@ extern int bfd_get_sign_extend_vma PARAMS ((bfd *));
extern boolean bfd_m68k_elf32_create_embedded_relocs
PARAMS ((bfd *, struct bfd_link_info *, struct sec *, struct sec *,
char **));
+extern boolean bfd_mips_elf32_create_embedded_relocs
+ PARAMS ((bfd *, struct bfd_link_info *, struct sec *, struct sec *,
+ char **));
/* SunOS shared library support routines for the linker. */
diff --git a/bfd/elf32-mips.c b/bfd/elf32-mips.c
index 5e5a96d..162ff41 100644
--- a/bfd/elf32-mips.c
+++ b/bfd/elf32-mips.c
@@ -9849,6 +9849,181 @@ _bfd_elf32_mips_write_section (output_bfd, sec, contents)
return true;
}
+/* Given a data section and an in-memory embedded reloc section, store
+ relocation information into the embedded reloc section which can be
+ used at runtime to relocate the data section. This is called by the
+ linker when the --embedded-relocs switch is used. This is called
+ after the add_symbols entry point has been called for all the
+ objects, and before the final_link entry point is called. */
+
+boolean
+bfd_mips_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
+ bfd *abfd;
+ struct bfd_link_info *info;
+ asection *datasec;
+ asection *relsec;
+ char **errmsg;
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf_Internal_Shdr *shndx_hdr;
+ Elf32_External_Sym *extsyms;
+ Elf32_External_Sym *free_extsyms = NULL;
+ Elf_External_Sym_Shndx *shndx_buf = NULL;
+ Elf_Internal_Rela *internal_relocs;
+ Elf_Internal_Rela *free_relocs = NULL;
+ Elf_Internal_Rela *irel, *irelend;
+ bfd_byte *p;
+ bfd_size_type amt;
+
+ BFD_ASSERT (! info->relocateable);
+
+ *errmsg = NULL;
+
+ if (datasec->reloc_count == 0)
+ return true;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ /* Read this BFD's symbols if we haven't done so already, or get the cached
+ copy if it exists. */
+ if (symtab_hdr->contents != NULL)
+ extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
+ else
+ {
+ /* Go get them off disk. */
+ if (info->keep_memory)
+ extsyms = ((Elf32_External_Sym *)
+ bfd_alloc (abfd, symtab_hdr->sh_size));
+ else
+ extsyms = ((Elf32_External_Sym *)
+ bfd_malloc (symtab_hdr->sh_size));
+ if (extsyms == NULL)
+ goto error_return;
+ if (! info->keep_memory)
+ free_extsyms = extsyms;
+ if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
+ || (bfd_bread (extsyms, symtab_hdr->sh_size, abfd)
+ != symtab_hdr->sh_size))
+ goto error_return;
+ if (info->keep_memory)
+ symtab_hdr->contents = (unsigned char *) extsyms;
+ }
+
+ shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
+ if (shndx_hdr->sh_size != 0)
+ {
+ amt = symtab_hdr->sh_info * sizeof (Elf_External_Sym_Shndx);
+ shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
+ if (shndx_buf == NULL)
+ goto error_return;
+ if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0
+ || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
+ goto error_return;
+ }
+
+ /* Get a copy of the native relocations. */
+ internal_relocs = (_bfd_elf32_link_read_relocs
+ (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
+ info->keep_memory));
+ if (internal_relocs == NULL)
+ goto error_return;
+ if (! info->keep_memory)
+ free_relocs = internal_relocs;
+
+ relsec->contents = (bfd_byte *) bfd_alloc (abfd, datasec->reloc_count * 12);
+ if (relsec->contents == NULL)
+ goto error_return;
+
+ p = relsec->contents;
+
+ irelend = internal_relocs + datasec->reloc_count;
+
+ for (irel = internal_relocs; irel < irelend; irel++, p += 12)
+ {
+ asection *targetsec;
+
+ /* We are going to write a four byte longword into the runtime
+ reloc section. The longword will be the address in the data
+ section which must be relocated. It is followed by the name
+ of the target section NUL-padded or truncated to 8
+ characters. */
+
+ /* We can only relocate absolute longword relocs at run time. */
+ if ((ELF32_R_TYPE (irel->r_info) != (int) R_MIPS_32) &&
+ (ELF32_R_TYPE (irel->r_info) != (int) R_MIPS_64))
+ {
+ *errmsg = _("unsupported reloc type");
+ bfd_set_error (bfd_error_bad_value);
+ goto error_return;
+ }
+ /* Get the target section referred to by the reloc. */
+ if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
+ {
+ Elf32_External_Sym *esym;
+ Elf_External_Sym_Shndx *shndx;
+ Elf_Internal_Sym isym;
+
+ /* A local symbol. */
+ esym = extsyms + ELF32_R_SYM (irel->r_info);
+ shndx = shndx_buf + (shndx_buf ? ELF32_R_SYM (irel->r_info) : 0);
+ bfd_elf32_swap_symbol_in (abfd, esym, shndx, &isym);
+
+ targetsec = bfd_section_from_elf_index (abfd, isym.st_shndx);
+ }
+ else
+ {
+ unsigned long indx;
+ struct elf_link_hash_entry *h;
+
+ /* An external symbol. */
+ indx = ELF32_R_SYM (irel->r_info);
+ h = elf_sym_hashes (abfd)[indx];
+ targetsec = NULL;
+ /*
+ * For some reason, in certain programs, the symbol will
+ * not be in the hash table. It seems to happen when you
+ * declare a static table of pointers to const external structures.
+ * In this case, the relocs are relative to data, not
+ * text, so just treating it like an undefined link
+ * should be sufficient.
+ */
+ BFD_ASSERT(h != NULL);
+ if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ targetsec = h->root.u.def.section;
+ }
+
+
+ /*
+ * Set the low bit of the relocation offset if it's a MIPS64 reloc.
+ * Relocations will always be on (at least) 32-bit boundaries.
+ */
+
+ bfd_put_32 (abfd, ((irel->r_offset + datasec->output_offset) +
+ ((ELF32_R_TYPE (irel->r_info) == (int) R_MIPS_64) ? 1 : 0)),
+ p);
+ memset (p + 4, 0, 8);
+ if (targetsec != NULL)
+ strncpy (p + 4, targetsec->output_section->name, 8);
+ }
+
+ if (shndx_buf != NULL)
+ free (shndx_buf);
+ if (free_extsyms != NULL)
+ free (free_extsyms);
+ if (free_relocs != NULL)
+ free (free_relocs);
+ return true;
+
+ error_return:
+ if (shndx_buf != NULL)
+ free (shndx_buf);
+ if (free_extsyms != NULL)
+ free (free_extsyms);
+ if (free_relocs != NULL)
+ free (free_relocs);
+ return false;
+}
+
/* This is almost identical to bfd_generic_get_... except that some
MIPS relocations need to be handled specially. Sigh. */