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ABIs, APIs, and

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other conventions

The main document for RISC-V ABI/ELF-related information is the RISC-V ELF psABI document, which can be found here: https://github.com/riscv/riscv-elf-psabi-doc/blob/master/riscv-elf.md

An overview of other RISC-V ABI/API related documents can be found here: https://github.com/riscv/riscv-elf-psabi-doc/blob/master/README.md

The following There are the following defined RISC-V ABIs are currently defined:

• 32-bit
  • ILP32, ILP32F, ILP32D, ILP32E
• 64-bit
  • LP64, LP64F, LP64D, LP64Q

Calling conventions

There are two calling conventions for GP registers in the RISC-V ecosystem:

• Standard ABI (sometime also called UABI): https://github.com/riscv/riscv-elf-psabi-doc/blob/master/riscv-elf.md#integer-register-convention-
• EABI (targeting embedded systems): https://github.com/riscv/riscv-eabi-spec/blob/master/EABI.adoc

The RISC-V ELF psABI can be found here: https://github.com/riscv/riscv-elf-psabi-doc/blob/master/riscv-elf.md

Default library path

The rich set of APIs has the consequence, that glibc's default library path includes a subdirectory for the actual ABI (e.g. "/usr/lib64/lp64d" for LP64D).
These default paths are defined An overview of other RISC-V ABI/API related documents can be found here: https://github.com/riscv/riscv-elf-psabi-doc/blob/master/README.mdsourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/riscv/configure.ac;

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Binutils

The GNU Binutils are a collection of binary tools (GNU linker, GNU assembler, many other excellent tools such as gprof).

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