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| author | Chao-ying Fu <fu@mips.com> | 2009-08-05 21:17:51 +0000 |
|---|---|---|
| committer | Chao-ying Fu <fu@mips.com> | 2009-08-05 21:17:51 +0000 |
| commit | cd8d5a82a25684b60494b5ac21e7807b985e1ca4 (patch) | |
| tree | 810d7a3958d1e0c1b9173e6a09d4bac60d14e143 /bfd/elfxx-mips.c | |
| parent | ef15dade898122c47e0f7dc0f48c1399c444afdd (diff) | |
| download | gdb-cd8d5a82a25684b60494b5ac21e7807b985e1ca4.zip gdb-cd8d5a82a25684b60494b5ac21e7807b985e1ca4.tar.gz gdb-cd8d5a82a25684b60494b5ac21e7807b985e1ca4.tar.bz2 | |
2009-08-05 Chao-ying Fu <fu@mips.com>
* elf32-mips.c (mips_reloc_map): Add BFD_RELOC_MIPS_JALR.
* elfxx-mips.c (JAL_TO_BAL_P): New define to transform JAL to BAL
for CPUs. It is true for RM9000.
(JALR_TO_BAL_P): New define to transform JALR to BAL. It is true
for all CPUs.
(mips_elf_perform_relocation): Use JAL_TO_BAL_P and JALR_TO_BAL_P
to guard the transformation.
Diffstat (limited to 'bfd/elfxx-mips.c')
| -rw-r--r-- | bfd/elfxx-mips.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/bfd/elfxx-mips.c b/bfd/elfxx-mips.c index 814ba90..ec712fa 100644 --- a/bfd/elfxx-mips.c +++ b/bfd/elfxx-mips.c @@ -668,6 +668,17 @@ static bfd *reldyn_sorting_bfd; ( ((elf_elfheader (abfd)->e_flags & EF_MIPS_ARCH) != E_MIPS_ARCH_1) \ || ((elf_elfheader (abfd)->e_flags & EF_MIPS_MACH) == E_MIPS_MACH_3900)) +/* True if ABFD is for CPUs that are faster if JAL is converted to BAL. + This should be safe for all architectures. We enable this predicate + for RM9000 for now. */ +#define JAL_TO_BAL_P(abfd) \ + ((elf_elfheader (abfd)->e_flags & EF_MIPS_MACH) == E_MIPS_MACH_9000) + +/* True if ABFD is for CPUs that are faster if JALR is converted to BAL. + This should be safe for all architectures. We enable this predicate for + all CPUs. */ +#define JALR_TO_BAL_P(abfd) 1 + /* True if ABFD is a PIC object. */ #define PIC_OBJECT_P(abfd) \ ((elf_elfheader (abfd)->e_flags & EF_MIPS_PIC) != 0) @@ -5586,15 +5597,15 @@ mips_elf_perform_relocation (struct bfd_link_info *info, x = (x & ~(0x3f << 26)) | (jalx_opcode << 26); } - /* On the RM9000, bal is faster than jal, because bal uses branch - prediction hardware. If we are linking for the RM9000, and we - see jal, and bal fits, use it instead. Note that this - transformation should be safe for all architectures. */ - if (bfd_get_mach (input_bfd) == bfd_mach_mips9000 - && !info->relocatable + /* Try converting JAL and JALR to BAL, if the target is in range. */ + if (!info->relocatable && !require_jalx - && ((r_type == R_MIPS_26 && (x >> 26) == 0x3) /* jal addr */ - || (r_type == R_MIPS_JALR && x == 0x0320f809))) /* jalr t9 */ + && ((JAL_TO_BAL_P (input_bfd) + && r_type == R_MIPS_26 + && (x >> 26) == 0x3) /* jal addr */ + || (JALR_TO_BAL_P (input_bfd) + && r_type == R_MIPS_JALR + && x == 0x0320f809))) /* jalr t9 */ { bfd_vma addr; bfd_vma dest; |