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authorKuan-Lin Chen <rufus@andestech.com>2019-11-14 14:24:22 +0800
committerNelson Chu <nelson@rivosinc.com>2023-05-19 16:24:10 +0800
commitf1cd8b94e7c941c2a9107c1112ab2339916b8efd (patch)
tree158d8ac0400a52e839bd8fabfec6bd15a8a1bdfe /include/elf
parent26e91972538544a237897baa5c806a008d36a88c (diff)
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RISC-V: Support subtraction of .uleb128.
https://github.com/riscv-non-isa/riscv-elf-psabi-doc/commit/96d6e190e9fc04a8517f9ff7fb9aed3e9876cbd6 There are some known limitations for now, * Do not shrink the length of the uleb128 value, even if the value is reduced after relaxations. Also reports error if the length grows up. * The R_RISCV_SET_ULEB128 needs to be paired with and be placed before the R_RISCV_SUB_ULEB128. bfd/ * bfd-in2.h: Regenerated. * elfnn-riscv.c (perform_relocation): Perform R_RISCV_SUB_ULEB128 and R_RISCV_SET_ULEB128 relocations. Do not shrink the length of the uleb128 value, and report error if the length grows up. Called the generic functions, _bfd_read_unsigned_leb128 and _bfd_write_unsigned_leb128, to encode the uleb128 into the section contents. (riscv_elf_relocate_section): Make sure that the R_RISCV_SET_ULEB128 must be paired with and be placed before the R_RISCV_SUB_ULEB128. * elfxx-riscv.c (howto_table): Added R_RISCV_SUB_ULEB128 and R_RISCV_SET_ULEB128. (riscv_reloc_map): Likewise. (riscv_elf_ignore_reloc): New function. * libbfd.h: Regenerated. * reloc.c (BFD_RELOC_RISCV_SET_ULEB128, BFD_RELOC_RISCV_SUB_ULEB128): New relocations to support .uleb128 subtraction. gas/ * config/tc-riscv.c (md_apply_fix): Added BFD_RELOC_RISCV_SET_ULEB128 and BFD_RELOC_RISCV_SUB_ULEB128. (s_riscv_leb128): Updated to allow uleb128 subtraction. (riscv_insert_uleb128_fixes): New function, scan uleb128 subtraction expressions and insert fixups for them. (riscv_md_finish): Called riscv_insert_uleb128_fixes for all sections. include/ * elf/riscv.h ((R_RISCV_SET_ULEB128, (R_RISCV_SUB_ULEB128): Defined. ld/ * testsuite/ld-riscv-elf/ld-riscv-elf.exp: Updated. * testsuite/ld-riscv-elf/uleb128*: New testcase for uleb128 subtraction. binutils/ * testsuite/binutils-all/nm.exp: Updated since RISCV supports .uleb128.
Diffstat (limited to 'include/elf')
-rw-r--r--include/elf/riscv.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/elf/riscv.h b/include/elf/riscv.h
index aabc71c..0aa8b33 100644
--- a/include/elf/riscv.h
+++ b/include/elf/riscv.h
@@ -87,6 +87,9 @@ START_RELOC_NUMBERS (elf_riscv_reloc_type)
RELOC_NUMBER (R_RISCV_SET32, 56)
RELOC_NUMBER (R_RISCV_32_PCREL, 57)
RELOC_NUMBER (R_RISCV_IRELATIVE, 58)
+ /* Reserved 59 for R_RISCV_PLT32. */
+ RELOC_NUMBER (R_RISCV_SET_ULEB128, 60)
+ RELOC_NUMBER (R_RISCV_SUB_ULEB128, 61)
END_RELOC_NUMBERS (R_RISCV_max)
/* Processor specific flags for the ELF header e_flags field. */