// i386.cc -- i386 target support for gold.
-// Copyright (C) 2006-2015 Free Software Foundation, Inc.
+// Copyright (C) 2006-2020 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
const unsigned char* plocal_symbols,
Relocatable_relocs*);
+ // Scan the relocs for --emit-relocs.
+ void
+ emit_relocs_scan(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<32, false>* object,
+ unsigned int data_shndx,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
+ size_t local_symbol_count,
+ const unsigned char* plocal_syms,
+ Relocatable_relocs* rr);
+
// Emit relocations for a section.
void
relocate_relocs(const Relocate_info<32, false>*,
size_t reloc_count,
Output_section* output_section,
elfcpp::Elf_types<32>::Elf_Off offset_in_output_section,
- const Relocatable_relocs*,
unsigned char* view,
elfcpp::Elf_types<32>::Elf_Addr view_address,
section_size_type view_size,
// Return whether SYM is call to a non-split function.
bool
- do_is_call_to_non_split(const Symbol* sym, unsigned int) const;
+ do_is_call_to_non_split(const Symbol* sym, const unsigned char*,
+ const unsigned char*, section_size_type) const;
// Adjust -fsplit-stack code which calls non-split-stack code.
void
do_calls_non_split(Relobj* object, unsigned int shndx,
section_offset_type fnoffset, section_size_type fnsize,
+ const unsigned char* prelocs, size_t reloc_count,
unsigned char* view, section_size_type view_size,
std::string* from, std::string* to) const;
// Do a relocation. Return false if the caller should not issue
// any warnings about this relocation.
inline bool
- relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*,
- size_t relnum, const elfcpp::Rel<32, false>&,
- unsigned int r_type, const Sized_symbol<32>*,
- const Symbol_value<32>*,
+ relocate(const Relocate_info<32, false>*, unsigned int,
+ Target_i386*, Output_section*, size_t, const unsigned char*,
+ const Sized_symbol<32>*, const Symbol_value<32>*,
unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
section_size_type);
// Do a TLS General-Dynamic to Initial-Exec transition.
inline void
tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum,
- Output_segment* tls_segment,
const elfcpp::Rel<32, false>&, unsigned int r_type,
elfcpp::Elf_types<32>::Elf_Addr value,
unsigned char* view,
// transition.
inline void
tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum,
- Output_segment* tls_segment,
const elfcpp::Rel<32, false>&, unsigned int r_type,
elfcpp::Elf_types<32>::Elf_Addr value,
unsigned char* view,
Local_dynamic_type local_dynamic_type_;
};
- // A class which returns the size required for a relocation type,
- // used while scanning relocs during a relocatable link.
- class Relocatable_size_for_reloc
+ // A class for inquiring about properties of a relocation,
+ // used while scanning relocs during a relocatable link and
+ // garbage collection.
+ class Classify_reloc :
+ public gold::Default_classify_reloc<elfcpp::SHT_REL, 32, false>
{
public:
- unsigned int
+ typedef Reloc_types<elfcpp::SHT_REL, 32, false>::Reloc Reltype;
+
+ // Return the explicit addend of the relocation (return 0 for SHT_REL).
+ static elfcpp::Elf_types<32>::Elf_Swxword
+ get_r_addend(const Reltype*)
+ { return 0; }
+
+ // Return the size of the addend of the relocation (only used for SHT_REL).
+ static unsigned int
get_size_for_reloc(unsigned int, Relobj*);
};
unsigned int shndx, Output_section* output_section,
Symbol* sym, const elfcpp::Rel<32, false>& reloc)
{
+ unsigned int r_type = elfcpp::elf_r_type<32>(reloc.get_r_info());
this->copy_relocs_.copy_reloc(symtab, layout,
symtab->get_sized_symbol<32>(sym),
- object, shndx, output_section, reloc,
+ object, shndx, output_section,
+ r_type, reloc.get_r_offset(), 0,
this->rel_dyn_section(layout));
}
0, // large_common_section_flags
NULL, // attributes_section
NULL, // attributes_vendor
- "_start" // entry_symbol_name
+ "_start", // entry_symbol_name
+ 32, // hash_entry_size
+ elfcpp::SHT_PROGBITS, // unwind_section_type
};
// Get the GOT section, creating it if necessary.
unsigned int
Target_i386::first_plt_entry_offset() const
{
+ if (this->plt_ == NULL)
+ return 0;
return this->plt_->first_plt_entry_offset();
}
unsigned int
Target_i386::plt_entry_size() const
{
+ if (this->plt_ == NULL)
+ return 0;
return this->plt_->get_plt_entry_size();
}
break;
case elfcpp::R_386_GOTOFF:
+ // A GOT-relative reference must resolve locally.
+ if (!gsym->is_defined())
+ gold_error(_("%s: relocation R_386_GOTOFF against undefined symbol %s"
+ " cannot be used when making a shared object"),
+ object->name().c_str(), gsym->name());
+ else if (gsym->is_from_dynobj())
+ gold_error(_("%s: relocation R_386_GOTOFF against external symbol %s"
+ " cannot be used when making a shared object"),
+ object->name().c_str(), gsym->name());
+ else if (gsym->is_preemptible())
+ gold_error(_("%s: relocation R_386_GOTOFF against preemptible symbol %s"
+ " cannot be used when making a shared object"),
+ object->name().c_str(), gsym->name());
+ // We need a GOT section.
+ target->got_section(symtab, layout);
+ break;
+
case elfcpp::R_386_GOTPC:
// We need a GOT section.
target->got_section(symtab, layout);
size_t local_symbol_count,
const unsigned char* plocal_symbols)
{
- gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL,
- Target_i386::Scan,
- Target_i386::Relocatable_size_for_reloc>(
+ gold::gc_process_relocs<32, false, Target_i386, Scan, Classify_reloc>(
symtab,
layout,
this,
return;
}
- gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL,
- Target_i386::Scan>(
+ gold::scan_relocs<32, false, Target_i386, Scan, Classify_reloc>(
symtab,
layout,
this,
inline bool
Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo,
- Target_i386* target,
- Output_section* output_section,
- size_t relnum,
- const elfcpp::Rel<32, false>& rel,
- unsigned int r_type,
- const Sized_symbol<32>* gsym,
- const Symbol_value<32>* psymval,
- unsigned char* view,
- elfcpp::Elf_types<32>::Elf_Addr address,
- section_size_type view_size)
+ unsigned int,
+ Target_i386* target,
+ Output_section* output_section,
+ size_t relnum,
+ const unsigned char* preloc,
+ const Sized_symbol<32>* gsym,
+ const Symbol_value<32>* psymval,
+ unsigned char* view,
+ elfcpp::Elf_types<32>::Elf_Addr address,
+ section_size_type view_size)
{
+ const elfcpp::Rel<32, false> rel(preloc);
+ unsigned int r_type = elfcpp::elf_r_type<32>(rel.get_r_info());
+
if (this->skip_call_tls_get_addr_)
{
if ((r_type != elfcpp::R_386_PLT32
+ && r_type != elfcpp::R_386_GOT32X
&& r_type != elfcpp::R_386_PC32)
|| gsym == NULL
|| strcmp(gsym->name(), "___tls_get_addr") != 0)
- gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
- _("missing expected TLS relocation"));
+ {
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("missing expected TLS relocation"));
+ this->skip_call_tls_get_addr_ = false;
+ }
else
{
this->skip_call_tls_get_addr_ = false;
}
}
+ bool baseless;
+
switch (r_type)
{
case elfcpp::R_386_NONE:
case elfcpp::R_386_GOT32:
case elfcpp::R_386_GOT32X:
+ baseless = (view[-1] & 0xc7) == 0x5;
+ // R_386_GOT32 and R_386_GOT32X don't work without base register
+ // when generating a position-independent output file.
+ if (baseless
+ && parameters->options().output_is_position_independent())
+ {
+ if(gsym)
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("unexpected reloc %u against global symbol %s without base register in object file when generating a position-independent output file"),
+ r_type, gsym->demangled_name().c_str());
+ else
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("unexpected reloc %u against local symbol without base register in object file when generating a position-independent output file"),
+ r_type);
+ }
+
// Convert
// mov foo@GOT(%reg), %reg
// to
{
view[-2] = 0x8d;
elfcpp::Elf_types<32>::Elf_Addr value;
- value = (psymval->value(object, 0)
- - target->got_plt_section()->address());
+ value = psymval->value(object, 0);
+ // Don't subtract the .got.plt section address for baseless
+ // addressing.
+ if (!baseless)
+ value -= target->got_plt_section()->address();
Relocate_functions<32, false>::rel32(view, value);
}
else
got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
- target->got_size());
}
+ // Add the .got.plt section address for baseless addressing.
+ if (baseless)
+ got_offset += target->got_plt_section()->address();
Relocate_functions<32, false>::rel32(view, got_offset);
}
break;
case elfcpp::R_386_GOTOFF:
{
- elfcpp::Elf_types<32>::Elf_Addr value;
- value = (psymval->value(object, 0)
- - target->got_plt_section()->address());
- Relocate_functions<32, false>::rel32(view, value);
+ elfcpp::Elf_types<32>::Elf_Addr reladdr;
+ reladdr = target->got_plt_section()->address();
+ Relocate_functions<32, false>::pcrel32(view, object, psymval, reladdr);
}
break;
}
if (optimized_type == tls::TLSOPT_TO_IE)
{
- this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type,
+ this->tls_gd_to_ie(relinfo, relnum, rel, r_type,
got_offset, view, view_size);
break;
}
}
if (optimized_type == tls::TLSOPT_TO_IE)
{
- if (tls_segment == NULL)
- {
- gold_assert(parameters->errors()->error_count() > 0
- || issue_undefined_symbol_error(gsym));
- return;
- }
- this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type,
+ this->tls_desc_gd_to_ie(relinfo, relnum, rel, r_type,
got_offset, view, view_size);
break;
}
unsigned char* view,
section_size_type view_size)
{
- // leal foo(,%reg,1),%eax; call ___tls_get_addr
+ // leal foo(,%ebx,1),%eax; call ___tls_get_addr@PLT
+ // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
+ // leal foo(%ebx),%eax; call ___tls_get_addr@PLT
// ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
- // leal foo(%reg),%eax; call ___tls_get_addr
+ // leal foo(%reg),%eax; call *___tls_get_addr@GOT(%reg)
// ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
unsigned char op1 = view[-1];
unsigned char op2 = view[-2];
+ unsigned char op3 = view[4];
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
op2 == 0x8d || op2 == 0x04);
- tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ op3 == 0xe8 || op3 == 0xff);
int roff = 5;
}
else
{
+ unsigned char reg = op1 & 7;
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- (op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
- if (rel.get_r_offset() + 9 < view_size
- && view[9] == 0x90)
+ ((op1 & 0xf8) == 0x80
+ && reg != 4
+ && reg != 0
+ && (op3 == 0xe8 || (view[5] & 0x7) == reg)));
+ if (op3 == 0xff
+ || (rel.get_r_offset() + 9 < view_size
+ && view[9] == 0x90))
{
- // There is a trailing nop. Use the size byte subl.
+ // There is an indirect call or a trailing nop. Use the size
+ // byte subl.
memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
roff = 6;
}
inline void
Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo,
size_t relnum,
- Output_segment*,
const elfcpp::Rel<32, false>& rel,
unsigned int,
elfcpp::Elf_types<32>::Elf_Addr value,
unsigned char* view,
section_size_type view_size)
{
- // leal foo(,%ebx,1),%eax; call ___tls_get_addr
+ // leal foo(,%ebx,1),%eax; call ___tls_get_addr@PLT
// ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax
- // leal foo(%ebx),%eax; call ___tls_get_addr; nop
+ // leal foo(%ebx),%eax; call ___tls_get_addr@PLT; nop
// ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax
+ // leal foo(%reg),%eax; call *___tls_get_addr@GOT(%reg)
+ // ==> movl %gs:0,%eax; addl foo@gotntpoff(%reg),%eax
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9);
unsigned char op1 = view[-1];
unsigned char op2 = view[-2];
+ unsigned char op3 = view[4];
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
op2 == 0x8d || op2 == 0x04);
- tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ op3 == 0xe8 || op3 == 0xff);
int roff;
}
else
{
+ unsigned char reg = op1 & 7;
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 10);
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- (op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
- tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[9] == 0x90);
+ ((op1 & 0xf8) == 0x80
+ && reg != 4
+ && reg != 0
+ && ((op3 == 0xe8 && view[9] == 0x90)
+ || (view[5] & 0x7) == reg)));
roff = 6;
}
Target_i386::Relocate::tls_desc_gd_to_ie(
const Relocate_info<32, false>* relinfo,
size_t relnum,
- Output_segment*,
const elfcpp::Rel<32, false>& rel,
unsigned int r_type,
elfcpp::Elf_types<32>::Elf_Addr value,
unsigned char* view,
section_size_type view_size)
{
- // leal foo(%reg), %eax; call ___tls_get_addr
+ // leal foo(%ebx), %eax; call ___tls_get_addr@PLT
// ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi
+ // leal foo(%reg), %eax; call call *___tls_get_addr@GOT(%reg)
+ // ==> movl %gs:0,%eax; leal (%esi),%esi
tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
- tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9);
- // FIXME: Does this test really always pass?
+ unsigned char op1 = view[-1];
+ unsigned char op2 = view[-2];
+ unsigned char op3 = view[4];
+
tls::check_tls(relinfo, relnum, rel.get_r_offset(),
- view[-2] == 0x8d && view[-1] == 0x83);
+ op3 == 0xe8 || op3 == 0xff);
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size,
+ op3 == 0xe8 ? 9 : 10);
- tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
+ // FIXME: Does this test really always pass?
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x8d);
- memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
+ unsigned char reg = op1 & 7;
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ ((op1 & 0xf8) == 0x80
+ && reg != 4
+ && reg != 0
+ && (op3 == 0xe8 || (view[5] & 0x7) == reg)));
+
+ if (op3 == 0xe8)
+ memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
+ else
+ memcpy(view - 2, "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0\0", 12);
// The next reloc should be a PLT32 reloc against __tls_get_addr.
// We can skip it.
{
gold_assert(sh_type == elfcpp::SHT_REL);
- gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL,
- Target_i386::Relocate, gold::Default_comdat_behavior>(
+ gold::relocate_section<32, false, Target_i386, Relocate,
+ gold::Default_comdat_behavior, Classify_reloc>(
relinfo,
this,
prelocs,
// link.
unsigned int
-Target_i386::Relocatable_size_for_reloc::get_size_for_reloc(
+Target_i386::Classify_reloc::get_size_for_reloc(
unsigned int r_type,
Relobj* object)
{
const unsigned char* plocal_symbols,
Relocatable_relocs* rr)
{
- gold_assert(sh_type == elfcpp::SHT_REL);
+ typedef gold::Default_scan_relocatable_relocs<Classify_reloc>
+ Scan_relocatable_relocs;
- typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL,
- Relocatable_size_for_reloc> Scan_relocatable_relocs;
+ gold_assert(sh_type == elfcpp::SHT_REL);
- gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL,
- Scan_relocatable_relocs>(
+ gold::scan_relocatable_relocs<32, false, Scan_relocatable_relocs>(
symtab,
layout,
object,
rr);
}
+// Scan the relocs for --emit-relocs.
+
+void
+Target_i386::emit_relocs_scan(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<32, false>* object,
+ unsigned int data_shndx,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
+ size_t local_symbol_count,
+ const unsigned char* plocal_syms,
+ Relocatable_relocs* rr)
+{
+ typedef gold::Default_classify_reloc<elfcpp::SHT_REL, 32, false>
+ Classify_reloc;
+ typedef gold::Default_emit_relocs_strategy<Classify_reloc>
+ Emit_relocs_strategy;
+
+ gold_assert(sh_type == elfcpp::SHT_REL);
+
+ gold::scan_relocatable_relocs<32, false, Emit_relocs_strategy>(
+ symtab,
+ layout,
+ object,
+ data_shndx,
+ prelocs,
+ reloc_count,
+ output_section,
+ needs_special_offset_handling,
+ local_symbol_count,
+ plocal_syms,
+ rr);
+}
+
// Emit relocations for a section.
void
size_t reloc_count,
Output_section* output_section,
elfcpp::Elf_types<32>::Elf_Off offset_in_output_section,
- const Relocatable_relocs* rr,
unsigned char* view,
elfcpp::Elf_types<32>::Elf_Addr view_address,
section_size_type view_size,
{
gold_assert(sh_type == elfcpp::SHT_REL);
- gold::relocate_relocs<32, false, elfcpp::SHT_REL>(
+ gold::relocate_relocs<32, false, Classify_reloc>(
relinfo,
prelocs,
reloc_count,
output_section,
offset_in_output_section,
- rr,
view,
view_address,
view_size,
// get_pc_thunk function.
bool
-Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const
+Target_i386::do_is_call_to_non_split(const Symbol* sym,
+ const unsigned char*,
+ const unsigned char*,
+ section_size_type) const
{
return (sym->type() == elfcpp::STT_FUNC
&& !is_prefix_of("__i686.get_pc_thunk.", sym->name()));
Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx,
section_offset_type fnoffset,
section_size_type fnsize,
+ const unsigned char*,
+ size_t,
unsigned char* view,
section_size_type view_size,
std::string* from,
0, // large_common_section_flags
NULL, // attributes_section
NULL, // attributes_vendor
- "_start" // entry_symbol_name
+ "_start", // entry_symbol_name
+ 32, // hash_entry_size
+ elfcpp::SHT_PROGBITS, // unwind_section_type
};
#define NACLMASK 0xe0 // 32-byte alignment mask
0, // large_common_section_flags
NULL, // attributes_section
NULL, // attributes_vendor
- "_start" // entry_symbol_name
+ "_start", // entry_symbol_name
+ 32, // hash_entry_size
+ elfcpp::SHT_PROGBITS, // unwind_section_type
};
class Target_selector_iamcu : public Target_selector
projects / deliverable / binutils-gdb.git / blobdiff