Add support arena atomics for RV64 #9329
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added 3 commits
July 26, 2025 12:33
There's a lot of redundant code related to store from register operations, let's extract emit_stx() to make code more compact. Signed-off-by: Pu Lehui <[email protected]>
There's a lot of redundant code related to store from immediate operations, let's extract emit_st() to make code more compact. Signed-off-by: Pu Lehui <[email protected]>
There's a lot of redundant code related to load into register operations, let's extract emit_ldx() to make code more compact. Signed-off-by: Pu Lehui <[email protected]>
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RV64 bpf is going to support ZACAS instructions. Let's separate toolchain support dependency from RISCV_ISA_ZACAS. Signed-off-by: Pu Lehui <[email protected]>
added 6 commits
July 26, 2025 12:33
Add rv_ext_enabled macro to check whether the runtime detection extension is enabled. Signed-off-by: Pu Lehui <[email protected]>
Add Zacas instructions introduced by [0] to reduce code size and improve performance of RV64 JIT. Link: https://github.com/riscvarchive/riscv-zacas/releases/download/v1.0/riscv-zacas.pdf [0] Signed-off-by: Pu Lehui <[email protected]>
Optimize cmpxchg instruction with amocas.w and amocas.d Zacas instructions. Signed-off-by: Pu Lehui <[email protected]>
Add ex_insn_off and ex_jmp_off fields to struct rv_jit_context so that add_exception_handler() does not need to be immediately followed by the instruction to add the exception table. ex_insn_off indicates the offset of the instruction to add the exception table, and ex_jmp_off indicates the offset to jump over the faulting instruction. This is to prepare for adding the exception table to atomic instructions later, because some atomic instructions need to perform zext or other operations. Signed-off-by: Pu Lehui <[email protected]>
Add arena atomics support for RMW atomics and load-acquire and store-release instructions. Non-Zacas cmpxchg is implemented via loop, which is not currently supported because it requires more complex extable and loop logic. Signed-off-by: Pu Lehui <[email protected]>
Enable arena atomics tests for RV64. Signed-off-by: Pu Lehui <[email protected]>
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Pull request for series with
subject: Add support arena atomics for RV64
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=983958