// i386.cc -- i386 target support for gold.
-// Copyright (C) 2006-2016 Free Software Foundation, Inc.
+// Copyright (C) 2006-2019 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
// Return whether SYM is call to a non-split function.
bool
- do_is_call_to_non_split(const Symbol* sym, const unsigned char*) 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
public gold::Default_classify_reloc<elfcpp::SHT_REL, 32, false>
{
public:
+ 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*);
NULL, // attributes_vendor
"_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);
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;
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;
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;
}
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;
}
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);
+
+ // FIXME: Does this test really always pass?
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x8d);
- tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
+ 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)));
- memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
+ 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.
bool
Target_i386::do_is_call_to_non_split(const Symbol* sym,
- const unsigned char*) const
+ 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()));
NULL, // attributes_vendor
"_start", // entry_symbol_name
32, // hash_entry_size
+ elfcpp::SHT_PROGBITS, // unwind_section_type
};
#define NACLMASK 0xe0 // 32-byte alignment mask
NULL, // attributes_vendor
"_start", // entry_symbol_name
32, // hash_entry_size
+ elfcpp::SHT_PROGBITS, // unwind_section_type
};
class Target_selector_iamcu : public Target_selector