[PATCH bpf-next v2 0/9] riscv: BPF JIT fix, optimizations and far jumps support · Björn Töpel <hidden> · 2019-12-16
[PATCH bpf-next v2 1/9] riscv, bpf: fix broken BPF tail calls · Björn Töpel <hidden> · 2019-12-16
[PATCH bpf-next v2 3/9] riscv, bpf: add support for far branching when emitting tail call · Björn Töpel <hidden> · 2019-12-16
Re: [PATCH bpf-next v2 3/9] riscv, bpf: add support for far branching when emitting tail call · Palmer Dabbelt <hidden> · 2019-12-23
[PATCH bpf-next v2 2/9] riscv, bpf: add support for far branching · Björn Töpel <hidden> · 2019-12-16
Re: [PATCH bpf-next v2 2/9] riscv, bpf: add support for far branching · Palmer Dabbelt <hidden> · 2019-12-23
Re: [PATCH bpf-next v2 2/9] riscv, bpf: add support for far branching · Björn Töpel <hidden> · 2020-01-07
Re: [PATCH bpf-next v2 2/9] riscv, bpf: add support for far branching · Palmer Dabbelt <hidden> · 2020-01-23
[PATCH bpf-next v2 4/9] riscv, bpf: add support for far jumps and exits · Björn Töpel <hidden> · 2019-12-16
Re: [PATCH bpf-next v2 4/9] riscv, bpf: add support for far jumps and exits · Palmer Dabbelt <hidden> · 2019-12-23
[PATCH bpf-next v2 5/9] riscv, bpf: optimize BPF tail calls · Björn Töpel <hidden> · 2019-12-16
Re: [PATCH bpf-next v2 5/9] riscv, bpf: optimize BPF tail calls · Palmer Dabbelt <hidden> · 2019-12-23
[PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free · Björn Töpel <hidden> · 2019-12-16
Re: [PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free · Daniel Borkmann <daniel@iogearbox.net> · 2019-12-16
Re: [PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free · Björn Töpel <hidden> · 2019-12-18
Re: [PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free · Paul Walmsley <hidden> · 2020-01-04
Re: [PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free · Björn Töpel <hidden> · 2020-01-07
Re: [PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free · Paul Walmsley <hidden> · 2020-01-07
Re: [PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free · Palmer Dabbelt <hidden> · 2019-12-23
Re: [PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free · Alex Ghiti <alex@ghiti.fr> · 2020-02-02
Re: [PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free · Björn Töpel <hidden> · 2020-02-03
Re: [PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free · Alex Ghiti <alex@ghiti.fr> · 2020-02-03
[PATCH bpf-next v2 7/9] riscv, bpf: optimize calls · Björn Töpel <hidden> · 2019-12-16
Re: [PATCH bpf-next v2 7/9] riscv, bpf: optimize calls · Palmer Dabbelt <hidden> · 2019-12-23
Re: [PATCH bpf-next v2 7/9] riscv, bpf: optimize calls · Björn Töpel <hidden> · 2020-01-07
Re: [PATCH bpf-next v2 7/9] riscv, bpf: optimize calls · Palmer Dabbelt <hidden> · 2020-01-28
Re: [PATCH bpf-next v2 7/9] riscv, bpf: optimize calls · Björn Töpel <hidden> · 2020-02-03
[PATCH bpf-next v2 8/9] riscv, bpf: add missing uapi header for BPF_PROG_TYPE_PERF_EVENT programs · Björn Töpel <hidden> · 2019-12-16
Re: [PATCH bpf-next v2 8/9] riscv, bpf: add missing uapi header for BPF_PROG_TYPE_PERF_EVENT programs · Palmer Dabbelt <hidden> · 2019-12-23
[PATCH bpf-next v2 9/9] riscv, perf: add arch specific perf_arch_bpf_user_pt_regs · Björn Töpel <hidden> · 2019-12-16
Re: [PATCH bpf-next v2 9/9] riscv, perf: add arch specific perf_arch_bpf_user_pt_regs · Palmer Dabbelt <hidden> · 2019-12-23
Re: [PATCH bpf-next v2 0/9] riscv: BPF JIT fix, optimizations and far jumps support · Daniel Borkmann <daniel@iogearbox.net> · 2019-12-19

Re: [PATCH bpf-next v2 7/9] riscv, bpf: optimize calls

From: Björn Töpel <hidden>
Date: 2020-02-03 12:11:45
Also in: bpf, linux-riscv

On Tue, 28 Jan 2020 at 03:15, Palmer Dabbelt [off-list ref] wrote:

[...]

quoted

BPF passes arguments in R1, R2, ..., and return value in R0. Given
that a0 plays the role of R1 and R0, how can we avoid the register
juggling (without complicating the JIT too much)? It would be nice
though... and ARM64 has the same concern AFAIK.

Oh, why did you say that?  This kind of stuff is why I'm twenty days behind on
email...

https://lore.kernel.org/bpf/20200128021145.36774-1-palmerdabbelt@google.com/T/#t (local)

:)

(back from vacation)

:-D Very nice, I'll take a look!


Björn

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