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LoongArch: BPF: Introduce emit_store_stack_imm64() helper

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Introduce a helper to store 64-bit immediate on the trampoline stack.
The helper will be used in the next patch. Also refactor the existing
code to use this helper.

Tested-by: Vincent Li <vincent.mc.li@gmail.com>
Reviewed-by: Menglong Dong <menglong8.dong@gmail.com>
Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Hengqi Chen 2026-04-23 12:49:36 +08:00 committed by Huacai Chen
parent c9ebe2016d
commit 6ef04707e8
1 changed files with 13 additions and 11 deletions
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24
arch/loongarch/net/bpf_jit.c
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@ -344,6 +344,12 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx, int insn)
#undef jmp_offset
}
static void emit_store_stack_imm64(struct jit_ctx *ctx, int reg, int stack_off, u64 imm64)
{
move_imm(ctx, reg, imm64, false);
emit_insn(ctx, std, reg, LOONGARCH_GPR_FP, stack_off);
}
static int emit_atomic_rmw(const struct bpf_insn *insn, struct jit_ctx *ctx)
{
const u8 t1 = LOONGARCH_GPR_T1;
@ -1676,12 +1682,11 @@ static int invoke_bpf_prog(struct jit_ctx *ctx, struct bpf_tramp_link *l,
struct bpf_prog *p = l->link.prog;
int cookie_off = offsetof(struct bpf_tramp_run_ctx, bpf_cookie);
if (l->cookie) {
move_imm(ctx, LOONGARCH_GPR_T1, l->cookie, false);
emit_insn(ctx, std, LOONGARCH_GPR_T1, LOONGARCH_GPR_FP, -run_ctx_off + cookie_off);
} else {
if (l->cookie)
emit_store_stack_imm64(ctx, LOONGARCH_GPR_T1,
-run_ctx_off + cookie_off, l->cookie);
else
emit_insn(ctx, std, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_FP, -run_ctx_off + cookie_off);
}
/* arg1: prog */
move_imm(ctx, LOONGARCH_GPR_A0, (const s64)p, false);
@ -1920,14 +1925,11 @@ static int __arch_prepare_bpf_trampoline(struct jit_ctx *ctx, struct bpf_tramp_i
emit_insn(ctx, std, LOONGARCH_GPR_S1, LOONGARCH_GPR_FP, -sreg_off);
/* store ip address of the traced function */
if (flags & BPF_TRAMP_F_IP_ARG) {
move_imm(ctx, LOONGARCH_GPR_T1, (const s64)func_addr, false);
emit_insn(ctx, std, LOONGARCH_GPR_T1, LOONGARCH_GPR_FP, -ip_off);
}
if (flags & BPF_TRAMP_F_IP_ARG)
emit_store_stack_imm64(ctx, LOONGARCH_GPR_T1, -ip_off, (u64)func_addr);
/* store arg regs count */
move_imm(ctx, LOONGARCH_GPR_T1, nr_arg_slots, false);
emit_insn(ctx, std, LOONGARCH_GPR_T1, LOONGARCH_GPR_FP, -nregs_off);
emit_store_stack_imm64(ctx, LOONGARCH_GPR_T1, -nregs_off, nr_arg_slots);
store_args(ctx, nr_arg_slots, args_off);