Commit 6ef04707 authored by Hengqi Chen's avatar Hengqi Chen Committed by Huacai Chen
Browse files

LoongArch: BPF: Introduce emit_store_stack_imm64() helper 



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: default avatarVincent Li <vincent.mc.li@gmail.com>
Reviewed-by: default avatarMenglong Dong <menglong8.dong@gmail.com>
Signed-off-by: default avatarHengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent c9ebe201

arch/loongarch/net/bpf_jit.c

+13 −11
Original line number Diff line number Diff line
@@ -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);