Linker: Preparation for more generic linker relaxation (Batch 1)#134
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Linker: Preparation for more generic linker relaxation (Batch 1)#134
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It does not only deduplicate multiple relaxation feature detection, but enable more complex features so that querying the feature availability will get too slow if we perform it per-relocation (not per-section). Even if that wouldn't happen any time soon, it will improve the maintainability around the linker relaxation code. bfd/ChangeLog: * elfnn-riscv.c (RISCV_RELAX_RVC, RISCV_RELAX_GP): New. (relax_func_t): Add new relax_features argument. (_bfd_riscv_relax_call): Likewise. Move feature detection to _bfd_riscv_relax_section. Use bool for simplicity. (_bfd_riscv_relax_lui): Likewise. Move feature detection to _bfd_riscv_relax_section. (_bfd_riscv_relax_tls_le): Likewise but features are not used. (_bfd_riscv_relax_align): Likewise but features are not used. (_bfd_riscv_relax_pc): Likewise. Move feature detection to _bfd_riscv_relax_section. (_bfd_riscv_relax_section): Detect relaxation-related features and pass the flags to each relaxation function. Use the PIC feature flag generated by itself.
There's not only Global-pointer Relaxation defined by the RISC-V psABI Specification. There is also the Zero-page relaxation, making the name "pcgp" not suitable for storage to PC-relative relocations used in the linker relaxation passes. This commit prepares for future changes including proper zero-page relaxation. bfd/ChangeLog: * elfnn-riscv.c (struct riscv_pcgp_hi_reloc): Rename to... (struct riscv_pc_relax_hi_reloc): ...here. (struct riscv_pcgp_lo_reloc): Rename to... (struct riscv_pc_relax_lo_reloc): ...here. (riscv_init_pcgp_relocs): Rename to... (riscv_init_pc_relax_relocs): ...here. (riscv_free_pcgp_relocs): Rename to... (riscv_free_pc_relax_relocs): ...here. (riscv_record_pcgp_hi_reloc): Rename to... (riscv_record_pc_relax_hi_reloc): ...here. (riscv_find_pcgp_hi_reloc): Rename to... (riscv_find_pc_relax_hi_reloc): ...here. (riscv_record_pcgp_lo_reloc): Rename to... (riscv_record_pc_relax_lo_reloc): ...here. (riscv_find_pcgp_lo_reloc): Rename to... (riscv_find_pc_relax_lo_reloc): ...here. (riscv_update_pcgp_relocs): Rename to... (riscv_update_pc_relax_relocs): ...here. (_riscv_relax_delete_bytes, _riscv_relax_delete_piecewise, _riscv_relax_delete_immediate, _bfd_riscv_relax_call, _bfd_riscv_relax_tls_le, _bfd_riscv_relax_align, _bfd_riscv_relax_section): Reflect name changes. (_bfd_riscv_relax_lui, _bfd_riscv_relax_pc): Likewise. Also change "GP-relative" to "GP/zero-relative" in the function description comment.
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Wiki Page (details): https://github.com/a4lg/binutils-gdb/wiki/riscv_linker_relax_1