From nobody Tue Feb 10 18:59:11 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BEB6035962 for ; Wed, 11 Jun 2025 04:00:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749614423; cv=none; b=OJJE51OxaC1VT8Sc86fZtYd4Ny/2jwK6Ll6rh0jXMRl+2zS4+3+ONDDa6vW5tplQU4J+utUDGG1Lb9XhFAEkshNbyAwZJghfCXt1B82g+/Cl13jTh56vdJp1yq1CuVV3+qM1kSKh+DCcgGHcPCPJ0u9RsyLFI0aYwp7RpUoEUyg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749614423; c=relaxed/simple; bh=6hil3jme6RmuqIKWHKQsZ2pdj9ZHIGCX1CiT7H80zY0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=I0eZbB07pY7rHMut/rL5VItckTUqo08oj65XIOT4iczQaorO0ii4mfGue5MVE2UbX0WWqQNsPiWFbG3qJU/49X01TzxLAccaofmfFtPX2siOhSDbZLvtKZmkCs+EW9RWMJlNJGgbbC7DlnnB40NkSNNv+L7Q2Vzom5W6wu8ZxJg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 9453542c467811f0b29709d653e92f7d-20250611 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NAME, HR_CC_NO_NAME, HR_CTE_8B HR_CTT_MISS, HR_DATE_H, HR_DATE_WKD, HR_DATE_ZONE, HR_FROM_NAME HR_SJ_DIGIT_LEN, HR_SJ_LANG, HR_SJ_LEN, HR_SJ_LETTER, HR_SJ_NOR_SYM HR_SJ_PHRASE, HR_SJ_PHRASE_LEN, HR_SJ_WS, HR_TO_COUNT, HR_TO_DOMAIN_COUNT HR_TO_NO_NAME, IP_UNTRUSTED, SRC_UNTRUSTED, IP_LOWREP, SRC_LOWREP DN_TRUSTED, SRC_TRUSTED, SA_EXISTED, SN_UNTRUSTED, SN_UNFAMILIAR SPF_NOPASS, DKIM_NOPASS, DMARC_NOPASS, CIE_BAD, CIE_GOOD CIE_GOOD_SPF, GTI_FG_BS, GTI_RG_INFO, GTI_C_BU, AMN_T1 AMN_GOOD, AMN_C_TI, AMN_C_BU, ABX_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.45,REQID:fad50d13-a218-43e3-b9cf-28ee8e40ef2d,IP:10, URL:0,TC:0,Content:0,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:5 X-CID-INFO: VERSION:1.1.45,REQID:fad50d13-a218-43e3-b9cf-28ee8e40ef2d,IP:10,UR L:0,TC:0,Content:0,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:5 X-CID-META: VersionHash:6493067,CLOUDID:25766d04431907a701408f86e60b33d2,BulkI D:250610171449T7G5X9KM,BulkQuantity:3,Recheck:0,SF:17|19|25|38|45|66|78|81 |82|102,TC:nil,Content:0|50,EDM:-3,IP:-2,URL:0,File:nil,RT:nil,Bulk:40,QS: nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,AR C:0 X-CID-BVR: 0,NGT X-CID-BAS: 0,NGT,0,_ X-CID-FACTOR: TF_CID_SPAM_FAS,TF_CID_SPAM_FSD,TF_CID_SPAM_FSI,TF_CID_SPAM_SNR X-UUID: 9453542c467811f0b29709d653e92f7d-20250611 X-User: duanchenghao@kylinos.cn Received: from localhost.localdomain [(223.104.40.103)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 1030593121; Wed, 11 Jun 2025 12:00:14 +0800 From: Chenghao Duan To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, yangtiezhu@loongson.cn, hengqi.chen@gmail.com, chenhuacai@kernel.org, kernel@xen0n.name, linux-kernel@vger.kernel.org Cc: guodongtai@kylinos.cn, duanchenghao@kylinos.cn, youling.tang@linux.dev, jianghaoran@kylinos.cn, Youling Tang Subject: [PATCH v1 2/5] LoongArch: BPF: The operation commands needed to add a trampoline Date: Wed, 11 Jun 2025 11:59:49 +0800 Message-Id: <20250611035952.111182-3-duanchenghao@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250611035952.111182-1-duanchenghao@kylinos.cn> References: <20250611035952.111182-1-duanchenghao@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add instrctions: emit_NOP emit_BREAK Add branch jump function: larch_insn_gen_beq larch_insn_gen_bne Add instruction copy function: larch_insn_text_copy The implementation of larch_insn_text_copy uses the fixmap FIX_TEXT_POKE0. Signed-off-by: George Guo Signed-off-by: Youling Tang Signed-off-by: Chenghao Duan --- arch/loongarch/include/asm/inst.h | 19 +++++++ arch/loongarch/kernel/inst.c | 85 +++++++++++++++++++++++++++++++ 2 files changed, 104 insertions(+) diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm= /inst.h index 3089785ca..dd6e07781 100644 --- a/arch/loongarch/include/asm/inst.h +++ b/arch/loongarch/include/asm/inst.h @@ -497,6 +497,7 @@ void arch_simulate_insn(union loongarch_instruction ins= n, struct pt_regs *regs); int larch_insn_read(void *addr, u32 *insnp); int larch_insn_write(void *addr, u32 insn); int larch_insn_patch_text(void *addr, u32 insn); +int larch_insn_text_copy(void *dst, void *src, size_t len); =20 u32 larch_insn_gen_nop(void); u32 larch_insn_gen_b(unsigned long pc, unsigned long dest); @@ -511,6 +512,8 @@ u32 larch_insn_gen_lu12iw(enum loongarch_gpr rd, int im= m); u32 larch_insn_gen_lu32id(enum loongarch_gpr rd, int imm); u32 larch_insn_gen_lu52id(enum loongarch_gpr rd, enum loongarch_gpr rj, in= t imm); u32 larch_insn_gen_jirl(enum loongarch_gpr rd, enum loongarch_gpr rj, int = imm); +u32 larch_insn_gen_beq(enum loongarch_gpr rd, enum loongarch_gpr rj, int i= mm); +u32 larch_insn_gen_bne(enum loongarch_gpr rd, enum loongarch_gpr rj, int i= mm); =20 static inline bool signed_imm_check(long val, unsigned int bit) { @@ -778,6 +781,22 @@ static inline void emit_##NAME(union loongarch_instruc= tion *insn, \ =20 DEF_EMIT_REG3SA2_FORMAT(alsld, alsld_op) =20 +#define DEF_EMIT_NOP(NAME) \ +static inline void emit_##NAME(union loongarch_instruction *insn) \ +{ \ + insn->word =3D INSN_NOP; \ +} + +DEF_EMIT_NOP(NOP) + +#define DEF_EMIT_BREAK(NAME) \ +static inline void emit_##NAME(union loongarch_instruction *insn) \ +{ \ + insn->word =3D INSN_BREAK; \ +} + +DEF_EMIT_BREAK(BREAK) + struct pt_regs; =20 void emulate_load_store_insn(struct pt_regs *regs, void __user *addr, unsi= gned int *pc); diff --git a/arch/loongarch/kernel/inst.c b/arch/loongarch/kernel/inst.c index 14d7d700b..a47dc3575 100644 --- a/arch/loongarch/kernel/inst.c +++ b/arch/loongarch/kernel/inst.c @@ -10,6 +10,33 @@ =20 static DEFINE_RAW_SPINLOCK(patch_lock); =20 +static bool is_image_text(unsigned long addr) +{ + return core_kernel_text(addr); +} + +static void *patch_map(void *addr, int fixmap) +{ + unsigned long uintaddr =3D (uintptr_t)addr; + bool image =3D is_image_text(uintaddr); + struct page *page; + phys_addr_t phys; + + if (image) + phys =3D __pa_symbol(addr); + else { + page =3D vmalloc_to_page(addr); + phys =3D page_to_phys(page) + offset_in_page(addr); + } + + return (void *)set_fixmap_offset(fixmap, phys); +} + +static void patch_unmap(int fixmap) +{ + clear_fixmap(fixmap); +} + void simu_pc(struct pt_regs *regs, union loongarch_instruction insn) { unsigned long pc =3D regs->csr_era; @@ -218,6 +245,36 @@ int larch_insn_patch_text(void *addr, u32 insn) return ret; } =20 +int larch_insn_text_copy(void *dst, void *src, size_t len) +{ + unsigned long flags; + size_t wlen =3D 0; + size_t size; + void *waddr; + void *ptr; + int ret =3D 0; + + raw_spin_lock_irqsave(&patch_lock, flags); + while (wlen < len) { + ptr =3D dst + wlen; + size =3D min_t(size_t, PAGE_SIZE - offset_in_page(ptr), + len - wlen); + + waddr =3D patch_map(ptr, FIX_TEXT_POKE0); + ret =3D copy_to_kernel_nofault(waddr, src + wlen, size); + patch_unmap(FIX_TEXT_POKE0); + + if (ret) { + pr_err("%s: operation failed\n", __func__); + break; + } + wlen +=3D size; + } + raw_spin_unlock_irqrestore(&patch_lock, flags); + + return ret; +} + u32 larch_insn_gen_nop(void) { return INSN_NOP; @@ -336,3 +393,31 @@ u32 larch_insn_gen_jirl(enum loongarch_gpr rd, enum lo= ongarch_gpr rj, int imm) =20 return insn.word; } + +u32 larch_insn_gen_beq(enum loongarch_gpr rd, enum loongarch_gpr rj, int i= mm) +{ + union loongarch_instruction insn; + + if ((imm & 3) || imm < -SZ_128K || imm >=3D SZ_128K) { + pr_warn("The generated beq instruction is out of range.\n"); + return INSN_BREAK; + } + + emit_beq(&insn, rd, rj, imm >> 2); + + return insn.word; +} + +u32 larch_insn_gen_bne(enum loongarch_gpr rd, enum loongarch_gpr rj, int i= mm) +{ + union loongarch_instruction insn; + + if ((imm & 3) || imm < -SZ_128K || imm >=3D SZ_128K) { + pr_warn("The generated bne instruction is out of range.\n"); + return INSN_BREAK; + } + + emit_bne(&insn, rj, rd, imm >> 2); + + return insn.word; +} --=20 2.25.1