RISC-V ELF psABI
Required for writing RISC-V assembly, setting up cross-compilation toolchains, or building compilers and OSes targeting RISC-V.
What It Defines
Defines the procedure call standard and ELF object file ABI for RISC-V: register usage conventions (x0–x31 with ABI aliases a0–a7 for arguments, s0–s11 for saved, t0–t6 for temporaries, ra link register), integer and floating-point calling conventions, ELF relocation types, and linker relaxation. Covers both RV32 and RV64 with ILP32, LP64, and floating-point variants.
Canonical (Normative)
Non-profit global organization that owns and maintains the open, royalty-free RISC-V ISA. Publishes the Unprivileged ISA (base integer and extensions), Privileged Architecture, and ABI/psABI specifications. Members include Google, NVIDIA, Qualcomm, Western Digital, and hundreds of academic and commercial organizations.
Related Specs
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POSIX defines the lingua franca of Unix/Linux systems programming. Every system call pattern, signal handler, file descriptor idiom, and shell script convention in the Linux/macOS world comes from this spec.