github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-09-22 12:44:03 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

riscv, bpf: Add RV_TAILCALL_OFFSET macro to format tailcall offset

Browse Source 
Add RV_TAILCALL_OFFSET macro to format tailcall offset, and correct the
relevant comments.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
Reviewed-by: Björn Töpel <bjorn@kernel.org>
Acked-by: Björn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/bpf/20260708064436.2971933-6-pulehui@huaweicloud.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
This commit is contained in:
Pu Lehui 2026-07-08 06:44:34 +00:00 committed by Kumar Kartikeya Dwivedi
parent 52fb1756ea
commit a21731f54c
No known key found for this signature in database
GPG Key ID: 472D377B63542F83
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/riscv/net/bpf_jit_comp64.c
View File

@ -20,6 +20,8 @@
#define RV_FENTRY_NBYTES (RV_FENTRY_NINSNS * 4)
/* imm that allows emit_imm to emit max count insns */
#define RV_MAX_COUNT_IMM 0x7FFF7FF7FF7FF7FF
/* fentry and TCC init insns will be skipped on tailcall */
#define RV_TAILCALL_OFFSET ((RV_FENTRY_NINSNS + 1) * 4)
#define RV_REG_TCC RV_REG_A6
#define RV_REG_TCC_SAVED RV_REG_S6 /* Store A6 in S6 if program do calls */
@ -271,9 +273,7 @@ static void __build_epilogue(bool is_tail_call, struct rv_jit_context *ctx)
if (!is_tail_call)
emit_addiw(RV_REG_A0, RV_REG_A5, 0, ctx);
emit_jalr(RV_REG_ZERO, is_tail_call ? RV_REG_T3 : RV_REG_RA,
/* fentry and TCC init insns will be skipped on tailcall */
is_tail_call ? (RV_FENTRY_NINSNS + 1) * 4 : 0,
ctx);
is_tail_call ? RV_TAILCALL_OFFSET : 0, ctx);
}
static void emit_bcc(u8 cond, u8 rd, u8 rs, int rvoff,
@ -393,7 +393,7 @@ static int emit_bpf_tail_call(int insn, struct rv_jit_context *ctx)
off = ninsns_rvoff(tc_ninsn - (ctx->ninsns - start_insn));
emit_branch(BPF_JEQ, RV_REG_T2, RV_REG_ZERO, off, ctx);
/* goto *(prog->bpf_func + 4); */
/* goto *(prog->bpf_func + RV_TAILCALL_OFFSET); */
off = offsetof(struct bpf_prog, bpf_func);
if (is_12b_check(off, insn))
return -1;