diff options
| author | Nick Clifton <nickc@redhat.com> | 2007-11-21 12:06:26 +0000 |
|---|---|---|
| committer | Nick Clifton <nickc@redhat.com> | 2007-11-21 12:06:26 +0000 |
| commit | fc91707cc23bf4d1cd75cc754c28cc4ff6b8c5bd (patch) | |
| tree | 621e934241b754dc7b872c4d45b4b54df447a19a /bfd | |
| parent | 031cd65fb243f8dc3bddfa4a4862a710ff1afde7 (diff) | |
| download | gdb-fc91707cc23bf4d1cd75cc754c28cc4ff6b8c5bd.zip gdb-fc91707cc23bf4d1cd75cc754c28cc4ff6b8c5bd.tar.gz gdb-fc91707cc23bf4d1cd75cc754c28cc4ff6b8c5bd.tar.bz2 | |
* elf-m10300.c (mn10300_elf_relax_section): Allow for alignment relocs when
computing whether instructions can be relaxed.
* ld-mn10300/i135409-4.s: New test case. Check for relaxation to a 16-bit
jump instruction.
* ld-mn10300/i135409-4.t: Linker script for the new test.
* ld-mn10300/i135409-4.d: Expected disassembly of new test.
* ld-mn10300/mn10300.exp: Run the new test.
Diffstat (limited to 'bfd')
| -rw-r--r-- | bfd/ChangeLog | 5 | ||||
| -rw-r--r-- | bfd/elf-m10300.c | 33 |
2 files changed, 37 insertions, 1 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog index c02027b..8dc7003 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,8 @@ +2007-11-21 Nick Clifton <nickc@redhat.com> + + * elf-m10300.c (mn10300_elf_relax_section): Allow for alignment + relocs when computing whether instructions can be relaxed. + 2007-11-16 Tristan Gingold <gingold@adacore.com> * elflink.c (elf_link_output_extsym): Weaken assertion: if diff --git a/bfd/elf-m10300.c b/bfd/elf-m10300.c index 77c8cae..2695217 100644 --- a/bfd/elf-m10300.c +++ b/bfd/elf-m10300.c @@ -2105,6 +2105,7 @@ mn10300_elf_relax_section (bfd *abfd, Elf_Internal_Sym *isymbuf = NULL; struct elf32_mn10300_link_hash_table *hash_table; asection *section = sec; + bfd_vma align_gap_adjustment; /* Assume nothing changes. */ *again = FALSE; @@ -2718,6 +2719,33 @@ mn10300_elf_relax_section (bfd *abfd, if (internal_relocs == NULL) goto error_return; + /* Scan for worst case alignment gap changes. Note that this logic + is not ideal; what we should do is run this scan for every + opcode/address range and adjust accordingly, but that's + expensive. Worst case is that for an alignment of N bytes, we + move by 2*N-N-1 bytes, assuming we have aligns of 1, 2, 4, 8, etc + all before it. Plus, this still doesn't cover cross-section + jumps with section alignment. */ + irelend = internal_relocs + sec->reloc_count; + align_gap_adjustment = 0; + for (irel = internal_relocs; irel < irelend; irel++) + { + if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_ALIGN) + { + bfd_vma adj = 1 << irel->r_addend; + bfd_vma aend = irel->r_offset; + + aend = BFD_ALIGN (aend, 1 << irel->r_addend); + adj = 2*adj - adj - 1; + + /* Record the biggest adjustmnet. Skip any alignment at the + end of our section. */ + if (align_gap_adjustment < adj + && aend < sec->output_section->vma + sec->output_offset + sec->size) + align_gap_adjustment = adj; + } + } + /* Walk through them looking for relaxing opportunities. */ irelend = internal_relocs + sec->reloc_count; for (irel = internal_relocs; irel < irelend; irel++) @@ -2933,7 +2961,10 @@ mn10300_elf_relax_section (bfd *abfd, /* See if the value will fit in 16 bits, note the high value is 0x7fff + 2 as the target will be two bytes closer if we are able to relax. */ - if ((long) value < 0x8001 && (long) value > -0x8000) + /* Account for jumps across alignment boundaries using + align_gap_adjustment. */ + if (value < 0x8001 - align_gap_adjustment + && ((bfd_signed_vma) value > -0x8000 + (bfd_signed_vma) align_gap_adjustment)) { unsigned char code; |