On Mon, Dec 12, 2022 at 1:11 AM Hengqi Chen <hengqi.chen@xxxxxxxxx> wrote:
>
> Add PT_REGS macros for LoongArch64.
>
> Signed-off-by: Hengqi Chen <hengqi.chen@xxxxxxxxx>
> ---
> tools/lib/bpf/bpf_tracing.h | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h
> index 2972dc25ff72..2d7da1caa961 100644
> --- a/tools/lib/bpf/bpf_tracing.h
> +++ b/tools/lib/bpf/bpf_tracing.h
> @@ -32,6 +32,9 @@
> #elif defined(__TARGET_ARCH_arc)
> #define bpf_target_arc
> #define bpf_target_defined
> +#elif defined(__TARGET_ARCH_loongarch)
> + #define bpf_target_loongarch
> + #define bpf_target_defined
> #else
>
> /* Fall back to what the compiler says */
> @@ -62,6 +65,9 @@
> #elif defined(__arc__)
> #define bpf_target_arc
> #define bpf_target_defined
> +#elif defined(__loongarch__) && __loongarch_grlen == 64
> + #define bpf_target_loongarch
> + #define bpf_target_defined
> #endif /* no compiler target */
>
> #endif
> @@ -258,6 +264,21 @@ struct pt_regs___arm64 {
> /* arc does not select ARCH_HAS_SYSCALL_WRAPPER. */
> #define PT_REGS_SYSCALL_REGS(ctx) ctx
>
> +#elif defined(bpf_target_loongarch)
> +
> +#define __PT_PARM1_REG regs[5]
> +#define __PT_PARM2_REG regs[6]
> +#define __PT_PARM3_REG regs[7]
> +#define __PT_PARM4_REG regs[8]
> +#define __PT_PARM5_REG regs[9]
> +#define __PT_RET_REG regs[1]
> +#define __PT_FP_REG regs[22]
> +#define __PT_RC_REG regs[4]
> +#define __PT_SP_REG regs[3]
> +#define __PT_IP_REG csr_era
> +/* loongarch does not select ARCH_HAS_SYSCALL_WRAPPER. */
> +#define PT_REGS_SYSCALL_REGS(ctx) ctx
Is there some online documentation explaining this architecture's
calling conventions? It would be useful to include that as a comment
to be able to refer back to it. On a related note, are there any
syscall specific calling convention differences, similar to
PT_REGS_PARM1_SYSCALL for arm64 or PT_REGS_PARM4_SYSCALL for x86-64?
> +
> #endif
>
> #if defined(bpf_target_defined)
> --
> 2.31.1
