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bpf,s390: introduce emit_store_stack_imm64() for trampoline

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Introduce a helper to store 64-bit immediate on the trampoline stack with
a help of a register.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20260224092208.1395085-2-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Menglong Dong 2026-02-24 17:22:06 +08:00 committed by Alexei Starovoitov
parent 74fef05ef1
commit 339193c44e
1 changed files with 10 additions and 11 deletions
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21
arch/s390/net/bpf_jit_comp.c
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@ -2513,6 +2513,13 @@ static void load_imm64(struct bpf_jit *jit, int dst_reg, u64 val)
EMIT6_IMM(0xc00d0000, dst_reg, val);
}
static void emit_store_stack_imm64(struct bpf_jit *jit, int tmp_reg, int stack_off, u64 imm)
{
load_imm64(jit, tmp_reg, imm);
/* stg %tmp_reg,stack_off(%r15) */
EMIT6_DISP_LH(0xe3000000, 0x0024, tmp_reg, REG_0, REG_15, stack_off);
}
static int invoke_bpf_prog(struct bpf_tramp_jit *tjit,
const struct btf_func_model *m,
struct bpf_tramp_link *tlink, bool save_ret)
@ -2527,10 +2534,7 @@ static int invoke_bpf_prog(struct bpf_tramp_jit *tjit,
* run_ctx.cookie = tlink->cookie;
*/
/* %r0 = tlink->cookie */
load_imm64(jit, REG_W0, tlink->cookie);
/* stg %r0,cookie_off(%r15) */
EMIT6_DISP_LH(0xe3000000, 0x0024, REG_W0, REG_0, REG_15, cookie_off);
emit_store_stack_imm64(jit, REG_W0, cookie_off, tlink->cookie);
/*
* if ((start = __bpf_prog_enter(p, &run_ctx)) == 0)
@ -2750,13 +2754,8 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
* arg_cnt = m->nr_args;
*/
if (flags & BPF_TRAMP_F_IP_ARG) {
/* %r0 = func_addr */
load_imm64(jit, REG_0, (u64)func_addr);
/* stg %r0,ip_off(%r15) */
EMIT6_DISP_LH(0xe3000000, 0x0024, REG_0, REG_0, REG_15,
tjit->ip_off);
}
if (flags & BPF_TRAMP_F_IP_ARG)
emit_store_stack_imm64(jit, REG_0, tjit->ip_off, (u64)func_addr);
/* lghi %r0,nr_bpf_args */
EMIT4_IMM(0xa7090000, REG_0, nr_bpf_args);
/* stg %r0,arg_cnt_off(%r15) */