hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
hdr->e_machine = TO_NATIVE(hdr->e_machine);
+ hdr->e_type = TO_NATIVE(hdr->e_type);
sechdrs = (void *)hdr + hdr->e_shoff;
info->sechdrs = sechdrs;
sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
+ sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
+ sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
}
/* Find symbol table. */
for (i = 1; i < hdr->e_shnum; i++) {
/**
* Whitelist to allow certain references to pass with no warning.
+ *
+ * Pattern 0:
+ * Do not warn if funtion/data are marked with __init_refok/__initdata_refok.
+ * The pattern is identified by:
+ * fromsec = .text.init.refok | .data.init.refok
+ *
* Pattern 1:
* If a module parameter is declared __initdata and permissions=0
* then this is legal despite the warning generated.
* atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one, *_console
*
* Pattern 3:
- * Whitelist all references from .pci_fixup* section to .init.text
- * This is part of the PCI init when built-in
- *
- * Pattern 4:
* Whitelist all refereces from .text.head to .init.data
* Whitelist all refereces from .text.head to .init.text
*
- * Pattern 5:
+ * Pattern 4:
* Some symbols belong to init section but still it is ok to reference
* these from non-init sections as these symbols don't have any memory
* allocated for them and symbol address and value are same. So even
* This pattern is identified by
* refsymname = __init_begin, _sinittext, _einittext
*
- * Pattern 6:
- * During the early init phase we have references from .init.text to
- * .text we have an intended section mismatch - do not warn about it.
- * See kernel_init() in init/main.c
- * tosec = .init.text
- * fromsec = .text
- * atsym = kernel_init
- *
- * Pattern 7:
+ * Pattern 5:
* Logos used in drivers/video/logo reside in __initdata but the
* funtion that references them are EXPORT_SYMBOL() so cannot be
* marker __init. So we whitelist them here.
* tosec = .init.data
* fromsec = .text*
* refsymname = logo_
- *
- * Pattern 8:
- * Symbols contained in .paravirtprobe may safely reference .init.text.
- * The pattern is:
- * tosec = .init.text
- * fromsec = .paravirtprobe
- *
**/
static int secref_whitelist(const char *modname, const char *tosec,
const char *fromsec, const char *atsym,
NULL
};
+ /* Check for pattern 0 */
+ if ((strcmp(fromsec, ".text.init.refok") == 0) ||
+ (strcmp(fromsec, ".data.init.refok") == 0))
+ return 1;
+
/* Check for pattern 1 */
if (strcmp(tosec, ".init.data") != 0)
f1 = 0;
return 1;
/* Check for pattern 3 */
- if ((strncmp(fromsec, ".pci_fixup", strlen(".pci_fixup")) == 0) &&
- (strcmp(tosec, ".init.text") == 0))
- return 1;
-
- /* Check for pattern 4 */
if ((strcmp(fromsec, ".text.head") == 0) &&
((strcmp(tosec, ".init.data") == 0) ||
(strcmp(tosec, ".init.text") == 0)))
return 1;
- /* Check for pattern 5 */
+ /* Check for pattern 4 */
for (s = pat3refsym; *s; s++)
if (strcmp(refsymname, *s) == 0)
return 1;
- /* Check for pattern 6 */
- if ((strcmp(tosec, ".init.text") == 0) &&
- (strcmp(fromsec, ".text") == 0) &&
- (strcmp(refsymname, "kernel_init") == 0))
- return 1;
-
- /* Check for pattern 7 */
+ /* Check for pattern 5 */
if ((strcmp(tosec, ".init.data") == 0) &&
(strncmp(fromsec, ".text", strlen(".text")) == 0) &&
(strncmp(refsymname, "logo_", strlen("logo_")) == 0))
return 1;
- /* Check for pattern 8 */
- if ((strcmp(tosec, ".init.text") == 0) &&
- (strcmp(fromsec, ".paravirtprobe") == 0))
- return 1;
-
return 0;
}
for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
if (sym->st_shndx != relsym->st_shndx)
continue;
+ if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
+ continue;
if (sym->st_value == addr)
return sym;
}
return;
if (before && after) {
- warn("%s - Section mismatch: reference to %s:%s from %s "
- "between '%s' (at offset 0x%llx) and '%s'\n",
- modname, secname, refsymname, fromsec,
+ warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
+ "(between '%s' and '%s')\n",
+ modname, fromsec, (unsigned long long)r.r_offset,
+ secname, refsymname,
elf->strtab + before->st_name,
- (long long)r.r_offset,
elf->strtab + after->st_name);
} else if (before) {
- warn("%s - Section mismatch: reference to %s:%s from %s "
- "after '%s' (at offset 0x%llx)\n",
- modname, secname, refsymname, fromsec,
- elf->strtab + before->st_name,
- (long long)r.r_offset);
+ warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
+ "(after '%s')\n",
+ modname, fromsec, (unsigned long long)r.r_offset,
+ secname, refsymname,
+ elf->strtab + before->st_name);
} else if (after) {
- warn("%s - Section mismatch: reference to %s:%s from %s "
+ warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
"before '%s' (at offset -0x%llx)\n",
- modname, secname, refsymname, fromsec,
- elf->strtab + after->st_name,
- (long long)r.r_offset);
+ modname, fromsec, (unsigned long long)r.r_offset,
+ secname, refsymname,
+ elf->strtab + after->st_name);
} else {
- warn("%s - Section mismatch: reference to %s:%s from %s "
- "(offset 0x%llx)\n",
- modname, secname, fromsec, refsymname,
- (long long)r.r_offset);
+ warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s\n",
+ modname, fromsec, (unsigned long long)r.r_offset,
+ secname, refsymname);
+ }
+}
+
+static unsigned int *reloc_location(struct elf_info *elf,
+ int rsection, Elf_Rela *r)
+{
+ Elf_Shdr *sechdrs = elf->sechdrs;
+ int section = sechdrs[rsection].sh_info;
+
+ return (void *)elf->hdr + sechdrs[section].sh_offset +
+ (r->r_offset - sechdrs[section].sh_addr);
+}
+
+static int addend_386_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
+{
+ unsigned int r_typ = ELF_R_TYPE(r->r_info);
+ unsigned int *location = reloc_location(elf, rsection, r);
+
+ switch (r_typ) {
+ case R_386_32:
+ r->r_addend = TO_NATIVE(*location);
+ break;
+ case R_386_PC32:
+ r->r_addend = TO_NATIVE(*location) + 4;
+ /* For CONFIG_RELOCATABLE=y */
+ if (elf->hdr->e_type == ET_EXEC)
+ r->r_addend += r->r_offset;
+ break;
+ }
+ return 0;
+}
+
+static int addend_arm_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
+{
+ unsigned int r_typ = ELF_R_TYPE(r->r_info);
+
+ switch (r_typ) {
+ case R_ARM_ABS32:
+ /* From ARM ABI: (S + A) | T */
+ r->r_addend = (int)(long)(elf->symtab_start + ELF_R_SYM(r->r_info));
+ break;
+ case R_ARM_PC24:
+ /* From ARM ABI: ((S + A) | T) - P */
+ r->r_addend = (int)(long)(elf->hdr + elf->sechdrs[rsection].sh_offset +
+ (r->r_offset - elf->sechdrs[rsection].sh_addr));
+ break;
+ default:
+ return 1;
+ }
+ return 0;
+}
+
+static int addend_mips_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
+{
+ unsigned int r_typ = ELF_R_TYPE(r->r_info);
+ unsigned int *location = reloc_location(elf, rsection, r);
+ unsigned int inst;
+
+ if (r_typ == R_MIPS_HI16)
+ return 1; /* skip this */
+ inst = TO_NATIVE(*location);
+ switch (r_typ) {
+ case R_MIPS_LO16:
+ r->r_addend = inst & 0xffff;
+ break;
+ case R_MIPS_26:
+ r->r_addend = (inst & 0x03ffffff) << 2;
+ break;
+ case R_MIPS_32:
+ r->r_addend = inst;
+ break;
}
+ return 0;
}
/**
r.r_offset = TO_NATIVE(rela->r_offset);
#if KERNEL_ELFCLASS == ELFCLASS64
if (hdr->e_machine == EM_MIPS) {
+ unsigned int r_typ;
r_sym = ELF64_MIPS_R_SYM(rela->r_info);
r_sym = TO_NATIVE(r_sym);
+ r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
+ r.r_info = ELF64_R_INFO(r_sym, r_typ);
} else {
r.r_info = TO_NATIVE(rela->r_info);
r_sym = ELF_R_SYM(r.r_info);
r.r_offset = TO_NATIVE(rel->r_offset);
#if KERNEL_ELFCLASS == ELFCLASS64
if (hdr->e_machine == EM_MIPS) {
+ unsigned int r_typ;
r_sym = ELF64_MIPS_R_SYM(rel->r_info);
r_sym = TO_NATIVE(r_sym);
+ r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
+ r.r_info = ELF64_R_INFO(r_sym, r_typ);
} else {
r.r_info = TO_NATIVE(rel->r_info);
r_sym = ELF_R_SYM(r.r_info);
r_sym = ELF_R_SYM(r.r_info);
#endif
r.r_addend = 0;
+ switch (hdr->e_machine) {
+ case EM_386:
+ if (addend_386_rel(elf, i, &r))
+ continue;
+ break;
+ case EM_ARM:
+ if(addend_arm_rel(elf, i, &r))
+ continue;
+ break;
+ case EM_MIPS:
+ if (addend_mips_rel(elf, i, &r))
+ continue;
+ break;
+ }
sym = elf->symtab_start + r_sym;
/* Skip special sections */
if (sym->st_shndx >= SHN_LORESERVE)
}
}
+/*
+ * Identify sections from which references to either a
+ * .init or a .exit section is OK.
+ *
+ * [OPD] Keith Ownes <kaos@sgi.com> commented:
+ * For our future {in}sanity, add a comment that this is the ppc .opd
+ * section, not the ia64 .opd section.
+ * ia64 .opd should not point to discarded sections.
+ * [.rodata] like for .init.text we ignore .rodata references -same reason
+ */
+static int initexit_section_ref_ok(const char *name)
+{
+ const char **s;
+ /* Absolute section names */
+ const char *namelist1[] = {
+ "__bug_table", /* used by powerpc for BUG() */
+ "__ex_table",
+ ".altinstructions",
+ ".cranges", /* used by sh64 */
+ ".fixup",
+ ".machvec", /* ia64 + powerpc uses these */
+ ".machine.desc",
+ ".opd", /* See comment [OPD] */
+ ".parainstructions",
+ ".pdr",
+ ".plt", /* seen on ARCH=um build on x86_64. Harmless */
+ ".smp_locks",
+ ".stab",
+ NULL
+ };
+ /* Start of section names */
+ const char *namelist2[] = {
+ ".debug",
+ ".eh_frame",
+ ".note", /* ignore ELF notes - may contain anything */
+ ".got", /* powerpc - global offset table */
+ ".toc", /* powerpc - table of contents */
+ NULL
+ };
+ /* part of section name */
+ const char *namelist3 [] = {
+ ".unwind", /* Sample: IA_64.unwind.exit.text */
+ NULL
+ };
+
+ for (s = namelist1; *s; s++)
+ if (strcmp(*s, name) == 0)
+ return 1;
+ for (s = namelist2; *s; s++)
+ if (strncmp(*s, name, strlen(*s)) == 0)
+ return 1;
+ for (s = namelist3; *s; s++)
+ if (strstr(name, *s) != NULL)
+ return 1;
+ return 0;
+}
+
/**
* Functions used only during module init is marked __init and is stored in
* a .init.text section. Likewise data is marked __initdata and stored in
return 0;
}
-/**
+/*
* Identify sections from which references to a .init section is OK.
*
* Unfortunately references to read only data that referenced .init
*
* where vgacon_startup is __init. If you want to wade through the false
* positives, take out the check for rodata.
- **/
+ */
static int init_section_ref_ok(const char *name)
{
const char **s;
/* Absolute section names */
const char *namelist1[] = {
- ".init",
- ".opd", /* see comment [OPD] at exit_section_ref_ok() */
- ".toc1", /* used by ppc64 */
- ".stab",
- ".data.rel.ro", /* used by parisc64 */
- ".parainstructions",
- ".text.lock",
- "__bug_table", /* used by powerpc for BUG() */
- ".pci_fixup_header",
- ".pci_fixup_final",
- ".pdr",
- "__param",
- "__ex_table",
- ".fixup",
- ".smp_locks",
- ".plt", /* seen on ARCH=um build on x86_64. Harmless */
"__ftr_fixup", /* powerpc cpu feature fixup */
"__fw_ftr_fixup", /* powerpc firmware feature fixup */
+ "__param",
+ ".data.rel.ro", /* used by parisc64 */
+ ".init",
+ ".text.lock",
NULL
};
/* Start of section names */
const char *namelist2[] = {
".init.",
- ".altinstructions",
- ".eh_frame",
- ".debug",
- ".parainstructions",
+ ".pci_fixup",
".rodata",
NULL
};
- /* part of section name */
- const char *namelist3 [] = {
- ".unwind", /* sample: IA_64.unwind.init.text */
- NULL
- };
+
+ if (initexit_section_ref_ok(name))
+ return 1;
for (s = namelist1; *s; s++)
if (strcmp(*s, name) == 0)
for (s = namelist2; *s; s++)
if (strncmp(*s, name, strlen(*s)) == 0)
return 1;
- for (s = namelist3; *s; s++)
- if (strstr(name, *s) != NULL)
- return 1;
+
+ /* If section name ends with ".init" we allow references
+ * as is the case with .initcallN.init, .early_param.init, .taglist.init etc
+ */
if (strrcmp(name, ".init") == 0)
return 1;
return 0;
/*
* Identify sections from which references to a .exit section is OK.
- *
- * [OPD] Keith Ownes <kaos@sgi.com> commented:
- * For our future {in}sanity, add a comment that this is the ppc .opd
- * section, not the ia64 .opd section.
- * ia64 .opd should not point to discarded sections.
- * [.rodata] like for .init.text we ignore .rodata references -same reason
- **/
+ */
static int exit_section_ref_ok(const char *name)
{
const char **s;
/* Absolute section names */
const char *namelist1[] = {
- ".exit.text",
".exit.data",
- ".init.text",
- ".rodata",
- ".opd", /* See comment [OPD] */
- ".toc1", /* used by ppc64 */
- ".altinstructions",
- ".pdr",
- "__bug_table", /* used by powerpc for BUG() */
+ ".exit.text",
".exitcall.exit",
- ".eh_frame",
- ".parainstructions",
- ".stab",
- "__ex_table",
- ".fixup",
- ".smp_locks",
- ".plt", /* seen on ARCH=um build on x86_64. Harmless */
- NULL
- };
- /* Start of section names */
- const char *namelist2[] = {
- ".debug",
- NULL
- };
- /* part of section name */
- const char *namelist3 [] = {
- ".unwind", /* Sample: IA_64.unwind.exit.text */
+ ".rodata",
NULL
};
+ if (initexit_section_ref_ok(name))
+ return 1;
+
for (s = namelist1; *s; s++)
if (strcmp(*s, name) == 0)
return 1;
- for (s = namelist2; *s; s++)
- if (strncmp(*s, name, strlen(*s)) == 0)
- return 1;
- for (s = namelist3; *s; s++)
- if (strstr(name, *s) != NULL)
- return 1;
return 0;
}
buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
" .exit = cleanup_module,\n"
"#endif\n");
+ buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
buf_printf(b, "};\n");
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff