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authorNelson Chu <nelson.chu@sifive.com>2021-08-11 01:26:39 -0700
committerNelson Chu <nelson.chu@sifive.com>2021-11-19 09:32:19 +0800
commit8155b8539b55bca87378129e02009cd8907d8c8c (patch)
tree30524e98925e912c02387ae7b2bd0c58b9bb6ff4 /include
parentfccf4ba5adaf69cac1875a194d8ee99dabf50c70 (diff)
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RISC-V: Support STO_RISCV_VARIANT_CC and DT_RISCV_VARIANT_CC.
This is the original discussion, https://github.com/riscv/riscv-elf-psabi-doc/pull/190 And here is the glibc part, https://sourceware.org/pipermail/libc-alpha/2021-August/129931.html For binutils part, we need to support a new direcitve: .variant_cc. The function symbol marked by .variant_cc means it need to be resolved directly without resolver for dynamic linker. We also add a new dynamic entry, STO_RISCV_VARIANT_CC, to indicate there are symbols with the special attribute in the dynamic symbol table of the object. I heard that llvm already have supported this in their mainline, so I think it's time to commit this. bfd/ * elfnn-riscv.c (riscv_elf_link_hash_table): Added variant_cc flag. It is used to check if relocations for variant CC symbols may be present. (allocate_dynrelocs): If the symbol has STO_RISCV_VARIANT_CC flag, then raise the variant_cc flag of riscv_elf_link_hash_table. (riscv_elf_size_dynamic_sections): Added dynamic entry for variant_cc. (riscv_elf_merge_symbol_attribute): New function, used to merge non-visibility st_other attributes, including STO_RISCV_VARIANT_CC. binutils/ * readelf.c (get_riscv_dynamic_type): New function. (get_dynamic_type): Called get_riscv_dynamic_type for riscv targets. (get_riscv_symbol_other): New function. (get_symbol_other): Called get_riscv_symbol_other for riscv targets. gas/ * config/tc-riscv.c (s_variant_cc): Marked symbol that it follows a variant CC convention. (riscv_elf_copy_symbol_attributes): Same as elf_copy_symbol_attributes, but without copying st_other. If a function symbol has special st_other value set via directives, then attaching an IFUNC resolver to that symbol should not override the st_other setting. (riscv_pseudo_table): Support variant_cc diretive. * config/tc-riscv.h (OBJ_COPY_SYMBOL_ATTRIBUTES): Defined. * testsuite/gas/riscv/variant_cc-set.d: New testcase. * testsuite/gas/riscv/variant_cc-set.s: Likewise. * testsuite/gas/riscv/variant_cc.d: Likewise. * testsuite/gas/riscv/variant_cc.s: Likewise. include/ * elf/riscv.h (DT_RISCV_VARIANT_CC): Defined to (DT_LOPROC + 1). (STO_RISCV_VARIANT_CC): Defined to 0x80. ld/ * testsuite/ld-riscv-elf/variant_cc-1.s: New testcase. * testsuite/ld-riscv-elf/variant_cc-2.s: Likewise. * testsuite/ld-riscv-elf/variant_cc-now.d: Likewise. * testsuite/ld-riscv-elf/variant_cc-r.d: Likewise. * testsuite/ld-riscv-elf/variant_cc-shared.d: Likewise. * testsuite/ld-riscv-elf/ld-riscv-elf.exp: Updated.
Diffstat (limited to 'include')
-rw-r--r--include/elf/riscv.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/elf/riscv.h b/include/elf/riscv.h
index 8082283..6edcf8a 100644
--- a/include/elf/riscv.h
+++ b/include/elf/riscv.h
@@ -117,6 +117,12 @@ END_RELOC_NUMBERS (R_RISCV_max)
/* The name of the global pointer symbol. */
#define RISCV_GP_SYMBOL "__global_pointer$"
+/* Processor specific dynamic array tags. */
+#define DT_RISCV_VARIANT_CC (DT_LOPROC + 1)
+
+/* RISC-V specific values for st_other. */
+#define STO_RISCV_VARIANT_CC 0x80
+
/* Additional section types. */
#define SHT_RISCV_ATTRIBUTES 0x70000003 /* Section holds attributes. */