#include <cstring>
#include "elfcpp.h"
+#include "dwarf.h"
#include "parameters.h"
#include "reloc.h"
#include "i386.h"
static const int plt_entry_size = 16;
// The first entry in the PLT for an executable.
- static unsigned char exec_first_plt_entry[plt_entry_size];
+ static const unsigned char exec_first_plt_entry[plt_entry_size];
// The first entry in the PLT for a shared object.
- static unsigned char dyn_first_plt_entry[plt_entry_size];
+ static const unsigned char dyn_first_plt_entry[plt_entry_size];
// Other entries in the PLT for an executable.
- static unsigned char exec_plt_entry[plt_entry_size];
+ static const unsigned char exec_plt_entry[plt_entry_size];
// Other entries in the PLT for a shared object.
- static unsigned char dyn_plt_entry[plt_entry_size];
+ static const unsigned char dyn_plt_entry[plt_entry_size];
+
+ // The .eh_frame unwind information for the PLT.
+ static const int plt_eh_frame_cie_size = 16;
+ static const int plt_eh_frame_fde_size = 32;
+ static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size];
+ static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
// Set the final size.
void
Output_data_plt_i386::Output_data_plt_i386(Symbol_table* symtab,
Layout* layout,
Output_data_space* got_plt)
- : Output_section_data(4), tls_desc_rel_(NULL), got_plt_(got_plt), count_(0),
+ : Output_section_data(16), tls_desc_rel_(NULL), got_plt_(got_plt), count_(0),
global_ifuncs_(), local_ifuncs_()
{
this->rel_ = new Reloc_section(false);
elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN,
0, true, true);
}
+
+ // Add unwind information if requested.
+ if (parameters->options().ld_generated_unwind_info())
+ layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size,
+ plt_eh_frame_fde, plt_eh_frame_fde_size);
}
void
// The first entry in the PLT for an executable.
-unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] =
+const unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] =
{
0xff, 0x35, // pushl contents of memory address
0, 0, 0, 0, // replaced with address of .got + 4
// The first entry in the PLT for a shared object.
-unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] =
+const unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] =
{
0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx)
0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx)
// Subsequent entries in the PLT for an executable.
-unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] =
+const unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] =
{
0xff, 0x25, // jmp indirect
0, 0, 0, 0, // replaced with address of symbol in .got
// Subsequent entries in the PLT for a shared object.
-unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] =
+const unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] =
{
0xff, 0xa3, // jmp *offset(%ebx)
0, 0, 0, 0, // replaced with offset of symbol in .got
0, 0, 0, 0 // replaced with offset to start of .plt
};
+// The .eh_frame unwind information for the PLT.
+
+const unsigned char
+Output_data_plt_i386::plt_eh_frame_cie[plt_eh_frame_cie_size] =
+{
+ 1, // CIE version.
+ 'z', // Augmentation: augmentation size included.
+ 'R', // Augmentation: FDE encoding included.
+ '\0', // End of augmentation string.
+ 1, // Code alignment factor.
+ 0x7c, // Data alignment factor.
+ 8, // Return address column.
+ 1, // Augmentation size.
+ (elfcpp::DW_EH_PE_pcrel // FDE encoding.
+ | elfcpp::DW_EH_PE_sdata4),
+ elfcpp::DW_CFA_def_cfa, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4.
+ elfcpp::DW_CFA_offset + 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4.
+ elfcpp::DW_CFA_nop, // Align to 16 bytes.
+ elfcpp::DW_CFA_nop
+};
+
+const unsigned char
+Output_data_plt_i386::plt_eh_frame_fde[plt_eh_frame_fde_size] =
+{
+ 0, 0, 0, 0, // Replaced with offset to .plt.
+ 0, 0, 0, 0, // Replaced with size of .plt.
+ 0, // Augmentation size.
+ elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8.
+ elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
+ elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12.
+ elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
+ elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
+ 11, // Block length.
+ elfcpp::DW_OP_breg4, 4, // Push %esp + 4.
+ elfcpp::DW_OP_breg8, 0, // Push %eip.
+ elfcpp::DW_OP_lit15, // Push 0xf.
+ elfcpp::DW_OP_and, // & (%eip & 0xf).
+ elfcpp::DW_OP_lit11, // Push 0xb.
+ elfcpp::DW_OP_ge, // >= ((%eip & 0xf) >= 0xb)
+ elfcpp::DW_OP_lit2, // Push 2.
+ elfcpp::DW_OP_shl, // << (((%eip & 0xf) >= 0xb) << 2)
+ elfcpp::DW_OP_plus, // + ((((%eip&0xf)>=0xb)<<2)+%esp+8
+ elfcpp::DW_CFA_nop, // Align to 32 bytes.
+ elfcpp::DW_CFA_nop,
+ elfcpp::DW_CFA_nop,
+ elfcpp::DW_CFA_nop
+};
+
// Write out the PLT. This uses the hand-coded instructions above,
// and adjusts them as needed. This is all specified by the i386 ELF
// Processor Supplement.
public:
Target_selector_i386()
: Target_selector_freebsd(elfcpp::EM_386, 32, false,
- "elf32-i386", "elf32-i386-freebsd")
+ "elf32-i386", "elf32-i386-freebsd",
+ "elf_i386")
{ }
Target*
projects / deliverable / binutils-gdb.git / blobdiff