diff options
Diffstat (limited to 'bfd/elf32-sparc.c')
| -rw-r--r-- | bfd/elf32-sparc.c | 114 |
1 files changed, 113 insertions, 1 deletions
diff --git a/bfd/elf32-sparc.c b/bfd/elf32-sparc.c index 1c8d0ba275a..70d65a5f87b 100644 --- a/bfd/elf32-sparc.c +++ b/bfd/elf32-sparc.c @@ -24,6 +24,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "libbfd.h" #include "elf-bfd.h" #include "elf/sparc.h" +#include "opcode/sparc.h" static reloc_howto_type *elf32_sparc_reloc_type_lookup PARAMS ((bfd *, bfd_reloc_code_real_type)); @@ -36,6 +37,8 @@ static boolean elf32_sparc_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); static boolean elf32_sparc_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *)); +static boolean elf32_sparc_relax_section + PARAMS ((bfd *, asection *, struct bfd_link_info *, boolean *)); static boolean elf32_sparc_relocate_section PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); @@ -1059,6 +1062,23 @@ elf32_sparc_size_dynamic_sections (output_bfd, info) return true; } + +#define SET_SEC_DO_RELAX(section) do { elf_section_data(section)->tdata = (void *)1; } while (0) +#define SEC_DO_RELAX(section) (elf_section_data(section)->tdata == (void *)1) + +/*ARGSUSED*/ +static boolean +elf32_sparc_relax_section (abfd, section, link_info, again) + bfd *abfd ATTRIBUTE_UNUSED; + asection *section ATTRIBUTE_UNUSED; + struct bfd_link_info *link_info ATTRIBUTE_UNUSED; + boolean *again; +{ + *again = false; + SET_SEC_DO_RELAX (section); + return true; +} + /* Relocate a SPARC ELF section. */ static boolean @@ -1518,6 +1538,7 @@ elf32_sparc_relocate_section (output_bfd, info, input_bfd, input_section, break; } + r = bfd_reloc_continue; if (r_type == R_SPARC_WDISP16) { bfd_vma x; @@ -1549,7 +1570,97 @@ elf32_sparc_relocate_section (output_bfd, info, input_bfd, input_section, bfd_putl32 (/*input_bfd,*/ x, contents + rel->r_offset); r = bfd_reloc_ok; } - else + else if ((r_type == R_SPARC_WDISP30 || r_type == R_SPARC_WPLT30) + && SEC_DO_RELAX (input_section) + && rel->r_offset + 4 < input_section->_raw_size) + { +#define G0 0 +#define O7 15 +#define XCC (2 << 20) +#define COND(x) (((x)&0xf)<<25) +#define CONDA COND(0x8) +#define INSN_BPA (F2(0,1) | CONDA | BPRED | XCC) +#define INSN_BA (F2(0,2) | CONDA) +#define INSN_OR F3(2, 0x2, 0) +#define INSN_NOP F2(0,4) + + bfd_vma x, y; + + /* If the instruction is a call with either: + restore + arithmetic instruction with rd == %o7 + where rs1 != %o7 and rs2 if it is register != %o7 + then we can optimize if the call destination is near + by changing the call into a branch always. */ + x = bfd_get_32 (input_bfd, contents + rel->r_offset); + y = bfd_get_32 (input_bfd, contents + rel->r_offset + 4); + if ((x & OP(~0)) == OP(1) && (y & OP(~0)) == OP(2)) + { + if (((y & OP3(~0)) == OP3(0x3d) /* restore */ + || ((y & OP3(0x28)) == 0 /* arithmetic */ + && (y & RD(~0)) == RD(O7))) + && (y & RS1(~0)) != RS1(O7) + && ((y & F3I(~0)) + || (y & RS2(~0)) != RS2(O7))) + { + bfd_vma reloc; + + reloc = relocation + rel->r_addend - rel->r_offset; + reloc -= (input_section->output_section->vma + + input_section->output_offset); + + /* Ensure the reloc fits into simm22. */ + if ((reloc & 3) == 0 + && ((reloc & ~(bfd_vma)0x7fffff) == 0 + || ((reloc | 0x7fffff) == ~(bfd_vma)0))) + { + reloc >>= 2; + + /* Check whether it fits into simm19 on v9. */ + if (((reloc & 0x3c0000) == 0 + || (reloc & 0x3c0000) == 0x3c0000) + && (elf_elfheader (output_bfd)->e_flags & EF_SPARC_32PLUS)) + x = INSN_BPA | (reloc & 0x7ffff); /* ba,pt %xcc */ + else + x = INSN_BA | (reloc & 0x3fffff); /* ba */ + bfd_put_32 (input_bfd, x, contents + rel->r_offset); + r = bfd_reloc_ok; + if (rel->r_offset >= 4 + && (y & (0xffffffff ^ RS1(~0))) + == (INSN_OR | RD(O7) | RS2(G0))) + { + bfd_vma z; + unsigned int reg; + + z = bfd_get_32 (input_bfd, + contents + rel->r_offset - 4); + if ((z & (0xffffffff ^ RD(~0))) + != (INSN_OR | RS1(O7) | RS2(G0))) + break; + + /* The sequence was + or %o7, %g0, %rN + call foo + or %rN, %g0, %o7 + + If call foo was replaced with ba, replace + or %rN, %g0, %o7 with nop. */ + + reg = (y & RS1(~0)) >> 14; + if (reg != ((z & RD(~0)) >> 25) + || reg == G0 || reg == O7) + break; + + bfd_put_32 (input_bfd, INSN_NOP, + contents + rel->r_offset + 4); + } + + } + } + } + } + + if (r == bfd_reloc_continue) r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, rel->r_offset, relocation, rel->r_addend); @@ -1967,6 +2078,7 @@ elf32_sparc_final_write_processing (abfd, linker) #define ELF_MAXPAGESIZE 0x10000 #define bfd_elf32_bfd_reloc_type_lookup elf32_sparc_reloc_type_lookup +#define bfd_elf32_bfd_relax_section elf32_sparc_relax_section #define elf_info_to_howto elf32_sparc_info_to_howto #define elf_backend_create_dynamic_sections \ _bfd_elf_create_dynamic_sections |