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Sun, 8 Feb 2026 09:57:28 +0800 (CST) dkim-signature: v=1; a=rsa-sha256; d=huawei.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=MBOss2GpWxHm5miiGmCeZ6bwZD6apFR4Ee6BnVFBvw8=; b=wdA48Tgv8faG4RMJ6I65jVfSFpjhROFKT2e3e2dQJ2uYSMo2wXWxP3jR/4M9AxjBUUeHWzNYy 2yt4+0NafEWNk0DWA2Cjt0ZUjd8059+xjdRzERfQ10AFLIMJuna16pRjeIdMR0/voYaI9kj8nly OwyYg/e70ss8zziDJG9vcEc= Received: from mail.maildlp.com (unknown [172.19.163.0]) by canpmsgout06.his.huawei.com (SkyGuard) with ESMTPS id 4f7rTB4Cr4zRhQn; Sun, 8 Feb 2026 09:53:34 +0800 (CST) Received: from kwepemf100007.china.huawei.com (unknown [7.202.181.221]) by mail.maildlp.com (Postfix) with ESMTPS id 6A2984056B; Sun, 8 Feb 2026 09:58:10 +0800 (CST) Received: from [10.67.110.198] (10.67.110.198) by kwepemf100007.china.huawei.com (7.202.181.221) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.36; Sun, 8 Feb 2026 09:58:09 +0800 Message-ID: <9830ef1c-d9cc-46ce-b292-07c8222d72ac@huawei.com> Date: Sun, 8 Feb 2026 09:58:03 +0800 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH bpf-next v3 1/3] bpf, riscv: introduce emit_store_stack_imm64() for trampoline Content-Language: en-US To: Menglong Dong , Menglong Dong CC: , , , , , , , , , , , , , , , , , , , , , References: <20260206122002.1494125-1-dongml2@chinatelecom.cn> <20260206122002.1494125-2-dongml2@chinatelecom.cn> <3042323.e9J7NaK4W3@7950hx> From: Pu Lehui In-Reply-To: <3042323.e9J7NaK4W3@7950hx> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: kwepems100002.china.huawei.com (7.221.188.206) To kwepemf100007.china.huawei.com (7.202.181.221) On 2026/2/7 18:53, Menglong Dong wrote: > On 2026/2/7 09:13, Pu Lehui wrote: >> >> On 2026/2/6 20:20, Menglong Dong wrote: >>> Introduce a helper to store 64-bit immediate on the trampoline stack with >>> a help of a register. >>> >>> Signed-off-by: Menglong Dong >>> Tested-by: Björn Töpel >>> Acked-by: Björn Töpel >>> --- >>> arch/riscv/net/bpf_jit_comp64.c | 25 ++++++++++++++----------- >>> 1 file changed, 14 insertions(+), 11 deletions(-) >>> >>> diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c >>> index 37888abee70c..e4f45e2e7e2f 100644 >>> --- a/arch/riscv/net/bpf_jit_comp64.c >>> +++ b/arch/riscv/net/bpf_jit_comp64.c >>> @@ -926,6 +926,14 @@ static void restore_stack_args(int nr_stack_args, int args_off, int stk_arg_off, >>> } >>> } >>> >>> +static void emit_store_stack_imm64(u8 reg, int stack_off, u64 imm64, >>> + struct rv_jit_context *ctx) >> >> Some nit. The first parameter can be removed by using a fixed RV_REG_T1. >> Also, placing imm64 before stack_off might looks better. > > Hi, Lehui. When I implement the emit_store_stack_imm64() in x86, > Andrii suggested that we'd better use the register explicitly to indicate > the register is used. So maybe it's better to keep this part still? No problem, the impact is minimal. And in that case, just leave imm64 and stack_off as they are. :) > > I can place the imm64 before stack_off. > > Thanks! > Menglong Dong > >> >>> +{ >>> + /* Load imm64 into reg and store it at [FP + stack_off]. */ >>> + emit_imm(reg, (s64)imm64, ctx); >>> + emit_sd(RV_REG_FP, stack_off, reg, ctx); >>> +} >>> + >>> static int invoke_bpf_prog(struct bpf_tramp_link *l, int args_off, int retval_off, >>> int run_ctx_off, bool save_ret, struct rv_jit_context *ctx) >>> { >>> @@ -933,12 +941,10 @@ static int invoke_bpf_prog(struct bpf_tramp_link *l, int args_off, int retval_of >>> struct bpf_prog *p = l->link.prog; >>> int cookie_off = offsetof(struct bpf_tramp_run_ctx, bpf_cookie); >>> >>> - if (l->cookie) { >>> - emit_imm(RV_REG_T1, l->cookie, ctx); >>> - emit_sd(RV_REG_FP, -run_ctx_off + cookie_off, RV_REG_T1, ctx); >>> - } else { >>> + if (l->cookie) >>> + emit_store_stack_imm64(RV_REG_T1, -run_ctx_off + cookie_off, l->cookie, ctx); >>> + else >>> emit_sd(RV_REG_FP, -run_ctx_off + cookie_off, RV_REG_ZERO, ctx); >>> - } >>> >>> /* arg1: prog */ >>> emit_imm(RV_REG_A0, (const s64)p, ctx); >>> @@ -1123,13 +1129,10 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, >>> emit_sd(RV_REG_FP, -sreg_off, RV_REG_S1, ctx); >>> >>> /* store ip address of the traced function */ >>> - if (flags & BPF_TRAMP_F_IP_ARG) { >>> - emit_imm(RV_REG_T1, (const s64)func_addr, ctx); >>> - emit_sd(RV_REG_FP, -ip_off, RV_REG_T1, ctx); >>> - } >>> + if (flags & BPF_TRAMP_F_IP_ARG) >>> + emit_store_stack_imm64(RV_REG_T1, -ip_off, (u64)func_addr, ctx); > >>> - emit_li(RV_REG_T1, nr_arg_slots, ctx); >>> - emit_sd(RV_REG_FP, -nregs_off, RV_REG_T1, ctx); >>> + emit_store_stack_imm64(RV_REG_T1, -nregs_off, nr_arg_slots, ctx); >>> >>> store_args(nr_arg_slots, args_off, ctx); >>> >> >> > > > > > > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 87E8BEF06E3 for ; 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Sun, 8 Feb 2026 09:58:09 +0800 Message-ID: <9830ef1c-d9cc-46ce-b292-07c8222d72ac@huawei.com> Date: Sun, 8 Feb 2026 09:58:03 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH bpf-next v3 1/3] bpf, riscv: introduce emit_store_stack_imm64() for trampoline Content-Language: en-US To: Menglong Dong , Menglong Dong CC: , , , , , , , , , , , , , , , , , , , , , References: <20260206122002.1494125-1-dongml2@chinatelecom.cn> <20260206122002.1494125-2-dongml2@chinatelecom.cn> <3042323.e9J7NaK4W3@7950hx> From: Pu Lehui In-Reply-To: <3042323.e9J7NaK4W3@7950hx> X-Originating-IP: [10.67.110.198] X-ClientProxiedBy: kwepems100002.china.huawei.com (7.221.188.206) To kwepemf100007.china.huawei.com (7.202.181.221) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260207_175823_932364_EDC6FB24 X-CRM114-Status: GOOD ( 14.24 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org CgpPbiAyMDI2LzIvNyAxODo1MywgTWVuZ2xvbmcgRG9uZyB3cm90ZToKPiBPbiAyMDI2LzIvNyAw OToxMywgUHUgTGVodWkgd3JvdGU6Cj4+Cj4+IE9uIDIwMjYvMi82IDIwOjIwLCBNZW5nbG9uZyBE b25nIHdyb3RlOgo+Pj4gSW50cm9kdWNlIGEgaGVscGVyIHRvIHN0b3JlIDY0LWJpdCBpbW1lZGlh dGUgb24gdGhlIHRyYW1wb2xpbmUgc3RhY2sgd2l0aAo+Pj4gYSBoZWxwIG9mIGEgcmVnaXN0ZXIu Cj4+Pgo+Pj4gU2lnbmVkLW9mZi1ieTogTWVuZ2xvbmcgRG9uZyA8ZG9uZ21sMkBjaGluYXRlbGVj b20uY24+Cj4+PiBUZXN0ZWQtYnk6IEJqw7ZybiBUw7ZwZWwgPGJqb3JuQGtlcm5lbC5vcmc+Cj4+ PiBBY2tlZC1ieTogQmrDtnJuIFTDtnBlbCA8Ympvcm5Aa2VybmVsLm9yZz4KPj4+IC0tLQo+Pj4g ICAgYXJjaC9yaXNjdi9uZXQvYnBmX2ppdF9jb21wNjQuYyB8IDI1ICsrKysrKysrKysrKysrLS0t LS0tLS0tLS0KPj4+ICAgIDEgZmlsZSBjaGFuZ2VkLCAxNCBpbnNlcnRpb25zKCspLCAxMSBkZWxl dGlvbnMoLSkKPj4+Cj4+PiBkaWZmIC0tZ2l0IGEvYXJjaC9yaXNjdi9uZXQvYnBmX2ppdF9jb21w NjQuYyBiL2FyY2gvcmlzY3YvbmV0L2JwZl9qaXRfY29tcDY0LmMKPj4+IGluZGV4IDM3ODg4YWJl ZTcwYy4uZTRmNDVlMmU3ZTJmIDEwMDY0NAo+Pj4gLS0tIGEvYXJjaC9yaXNjdi9uZXQvYnBmX2pp dF9jb21wNjQuYwo+Pj4gKysrIGIvYXJjaC9yaXNjdi9uZXQvYnBmX2ppdF9jb21wNjQuYwo+Pj4g QEAgLTkyNiw2ICs5MjYsMTQgQEAgc3RhdGljIHZvaWQgcmVzdG9yZV9zdGFja19hcmdzKGludCBu cl9zdGFja19hcmdzLCBpbnQgYXJnc19vZmYsIGludCBzdGtfYXJnX29mZiwKPj4+ICAgIAl9Cj4+ PiAgICB9Cj4+PiAgICAKPj4+ICtzdGF0aWMgdm9pZCBlbWl0X3N0b3JlX3N0YWNrX2ltbTY0KHU4 IHJlZywgaW50IHN0YWNrX29mZiwgdTY0IGltbTY0LAo+Pj4gKwkJCQkgICBzdHJ1Y3QgcnZfaml0 X2NvbnRleHQgKmN0eCkKPj4KPj4gU29tZSBuaXQuIFRoZSBmaXJzdCBwYXJhbWV0ZXIgY2FuIGJl IHJlbW92ZWQgYnkgdXNpbmcgYSBmaXhlZCBSVl9SRUdfVDEuCj4+IEFsc28sIHBsYWNpbmcgaW1t NjQgYmVmb3JlIHN0YWNrX29mZiBtaWdodCBsb29rcyBiZXR0ZXIuCj4gCj4gSGksIExlaHVpLiBX aGVuIEkgaW1wbGVtZW50IHRoZSBlbWl0X3N0b3JlX3N0YWNrX2ltbTY0KCkgaW4geDg2LAo+IEFu ZHJpaSBzdWdnZXN0ZWQgdGhhdCB3ZSdkIGJldHRlciB1c2UgdGhlIHJlZ2lzdGVyIGV4cGxpY2l0 bHkgdG8gaW5kaWNhdGUKPiB0aGUgcmVnaXN0ZXIgaXMgdXNlZC4gU28gbWF5YmUgaXQncyBiZXR0 ZXIgdG8ga2VlcCB0aGlzIHBhcnQgc3RpbGw/CgpObyBwcm9ibGVtLCB0aGUgaW1wYWN0IGlzIG1p bmltYWwuIEFuZCBpbiB0aGF0IGNhc2UsIGp1c3QgbGVhdmUgaW1tNjQgCmFuZCBzdGFja19vZmYg YXMgdGhleSBhcmUuIDopCgo+IAo+IEkgY2FuIHBsYWNlIHRoZSBpbW02NCBiZWZvcmUgc3RhY2tf b2ZmLgo+IAo+IFRoYW5rcyEKPiBNZW5nbG9uZyBEb25nCj4gCj4+Cj4+PiArewo+Pj4gKwkvKiBM b2FkIGltbTY0IGludG8gcmVnIGFuZCBzdG9yZSBpdCBhdCBbRlAgKyBzdGFja19vZmZdLiAqLwo+ Pj4gKwllbWl0X2ltbShyZWcsIChzNjQpaW1tNjQsIGN0eCk7Cj4+PiArCWVtaXRfc2QoUlZfUkVH X0ZQLCBzdGFja19vZmYsIHJlZywgY3R4KTsKPj4+ICt9Cj4+PiArCj4+PiAgICBzdGF0aWMgaW50 IGludm9rZV9icGZfcHJvZyhzdHJ1Y3QgYnBmX3RyYW1wX2xpbmsgKmwsIGludCBhcmdzX29mZiwg aW50IHJldHZhbF9vZmYsCj4+PiAgICAJCQkgICBpbnQgcnVuX2N0eF9vZmYsIGJvb2wgc2F2ZV9y ZXQsIHN0cnVjdCBydl9qaXRfY29udGV4dCAqY3R4KQo+Pj4gICAgewo+Pj4gQEAgLTkzMywxMiAr OTQxLDEwIEBAIHN0YXRpYyBpbnQgaW52b2tlX2JwZl9wcm9nKHN0cnVjdCBicGZfdHJhbXBfbGlu ayAqbCwgaW50IGFyZ3Nfb2ZmLCBpbnQgcmV0dmFsX29mCj4+PiAgICAJc3RydWN0IGJwZl9wcm9n ICpwID0gbC0+bGluay5wcm9nOwo+Pj4gICAgCWludCBjb29raWVfb2ZmID0gb2Zmc2V0b2Yoc3Ry dWN0IGJwZl90cmFtcF9ydW5fY3R4LCBicGZfY29va2llKTsKPj4+ICAgIAo+Pj4gLQlpZiAobC0+ Y29va2llKSB7Cj4+PiAtCQllbWl0X2ltbShSVl9SRUdfVDEsIGwtPmNvb2tpZSwgY3R4KTsKPj4+ IC0JCWVtaXRfc2QoUlZfUkVHX0ZQLCAtcnVuX2N0eF9vZmYgKyBjb29raWVfb2ZmLCBSVl9SRUdf VDEsIGN0eCk7Cj4+PiAtCX0gZWxzZSB7Cj4+PiArCWlmIChsLT5jb29raWUpCj4+PiArCQllbWl0 X3N0b3JlX3N0YWNrX2ltbTY0KFJWX1JFR19UMSwgLXJ1bl9jdHhfb2ZmICsgY29va2llX29mZiwg bC0+Y29va2llLCBjdHgpOwo+Pj4gKwllbHNlCj4+PiAgICAJCWVtaXRfc2QoUlZfUkVHX0ZQLCAt cnVuX2N0eF9vZmYgKyBjb29raWVfb2ZmLCBSVl9SRUdfWkVSTywgY3R4KTsKPj4+IC0JfQo+Pj4g ICAgCj4+PiAgICAJLyogYXJnMTogcHJvZyAqLwo+Pj4gICAgCWVtaXRfaW1tKFJWX1JFR19BMCwg KGNvbnN0IHM2NClwLCBjdHgpOwo+Pj4gQEAgLTExMjMsMTMgKzExMjksMTAgQEAgc3RhdGljIGlu dCBfX2FyY2hfcHJlcGFyZV9icGZfdHJhbXBvbGluZShzdHJ1Y3QgYnBmX3RyYW1wX2ltYWdlICpp bSwKPj4+ICAgIAllbWl0X3NkKFJWX1JFR19GUCwgLXNyZWdfb2ZmLCBSVl9SRUdfUzEsIGN0eCk7 Cj4+PiAgICAKPj4+ICAgIAkvKiBzdG9yZSBpcCBhZGRyZXNzIG9mIHRoZSB0cmFjZWQgZnVuY3Rp b24gKi8KPj4+IC0JaWYgKGZsYWdzICYgQlBGX1RSQU1QX0ZfSVBfQVJHKSB7Cj4+PiAtCQllbWl0 X2ltbShSVl9SRUdfVDEsIChjb25zdCBzNjQpZnVuY19hZGRyLCBjdHgpOwo+Pj4gLQkJZW1pdF9z ZChSVl9SRUdfRlAsIC1pcF9vZmYsIFJWX1JFR19UMSwgY3R4KTsKPj4+IC0JfQo+Pj4gKwlpZiAo ZmxhZ3MgJiBCUEZfVFJBTVBfRl9JUF9BUkcpCj4+PiArCQllbWl0X3N0b3JlX3N0YWNrX2ltbTY0 KFJWX1JFR19UMSwgLWlwX29mZiwgKHU2NClmdW5jX2FkZHIsIGN0eCk7ID4KPj4+IC0JZW1pdF9s aShSVl9SRUdfVDEsIG5yX2FyZ19zbG90cywgY3R4KTsKPj4+IC0JZW1pdF9zZChSVl9SRUdfRlAs IC1ucmVnc19vZmYsIFJWX1JFR19UMSwgY3R4KTsKPj4+ICsJZW1pdF9zdG9yZV9zdGFja19pbW02 NChSVl9SRUdfVDEsIC1ucmVnc19vZmYsIG5yX2FyZ19zbG90cywgY3R4KTsKPj4+ICAgIAo+Pj4g ICAgCXN0b3JlX2FyZ3MobnJfYXJnX3Nsb3RzLCBhcmdzX29mZiwgY3R4KTsKPj4+ICAgIAo+Pgo+ Pgo+IAo+IAo+IAo+IAo+IAo+IAoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX18KbGludXgtcmlzY3YgbWFpbGluZyBsaXN0CmxpbnV4LXJpc2N2QGxpc3RzLmlu ZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9s aW51eC1yaXNjdgo=