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| author | Palmer Dabbelt <palmer@dabbelt.com> | 2017-05-18 18:08:25 -0700 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@dabbelt.com> | 2017-10-19 09:19:32 -0700 |
| commit | ff6f4d9b2d6c25ac144bab869df6e3d6123a6f8f (patch) | |
| tree | 59e6a3f173dd8987b985d830a745f06e6b881f9d /bfd/ChangeLog | |
| parent | 95e42ad4425f0ab0ebfb90035a891be576f9fca4 (diff) | |
| download | gdb-ff6f4d9b2d6c25ac144bab869df6e3d6123a6f8f.zip gdb-ff6f4d9b2d6c25ac144bab869df6e3d6123a6f8f.tar.gz gdb-ff6f4d9b2d6c25ac144bab869df6e3d6123a6f8f.tar.bz2 | |
RISC-V: Add R_RISCV_DELETE, which marks bytes for deletion
We currently delete bytes by shifting an entire BFD backwards to
overwrite the bytes we no longer need. The result is that relaxing a
BFD is quadratic time.
This patch adds an additional relocation that specifies a byte range
that will be deleted from the final object file, and adds a relaxation
pass (between the existing passes that delete bytes and the alignment
pass) that actually deletes the bytes. Note that deletion is still
quadratic time, and nothing uses R_RISCV_DELETE yet.
I've been meaning to go convert all the other relaxations to use
R_RISCV_DELETE and then make it faster, but this patch has been sitting
around for months so it looks like that won't happen for a bit. The
PCREL->GPREL relaxation that comes next uses this, and since we've been
using these two patches out of tree since I wrote them months ago I
figure it's better to just get them in now. I (or someone else :)) can
convert all the relocations later...
R_RISCV_DELETE will never be emitted into ELF objects, so therefor isn't
exposed to the rest of binutils. As such, we're not considering this as
part of the ABI.
bfd/ChangeLog
2017-10-19 Palmer Dabbelt <palmer@dabbelt.com>
* elfnn-riscv (R_RISCV_DELETE): New define.
(_bfd_riscv_relax_delete): New function.
(perform_relocation): Handle R_RISCV_DELETE.
(_bfd_riscv_relax_section): Likewise.
ld/ChangeLog
2017-10-19 Palmer Dabbelt <palmer@dabbelt.com>
* emultempl/riscvelf.em (riscv_elf_before_allocation): Add a
third relaxation pass.
Diffstat (limited to 'bfd/ChangeLog')
| -rw-r--r-- | bfd/ChangeLog | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog index 959cf06..772f526 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,10 @@ +2017-10-19 Palmer Dabbelt <palmer@dabbelt.com> + + * elfnn-riscv.c (R_RISCV_DELETE): New define. + (_bfd_riscv_relax_delete): New function. + (perform_relocation): Handle R_RISCV_DELETE. + (_bfd_riscv_relax_section): Likewise. + 2017-10-19 H.J. Lu <hongjiu.lu@intel.com> PR ld/22263 |