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Fri, 23 Jan 2026 22:21:14 -0800 (PST) From: Menglong Dong X-Google-Original-From: Menglong Dong To: andrii@kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, 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, davem@davemloft.net, dsahern@kernel.org, tglx@linutronix.de, mingo@redhat.com, jiang.biao@linux.dev, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next v13 06/13] bpf,x86: introduce emit_store_stack_imm64() for trampoline Date: Sat, 24 Jan 2026 14:20:01 +0800 Message-ID: <20260124062008.8657-7-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260124062008.8657-1-dongml2@chinatelecom.cn> References: <20260124062008.8657-1-dongml2@chinatelecom.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" Introduce the helper emit_store_stack_imm64(), which is used to store a imm64 to the stack with the help of a register. Signed-off-by: Menglong Dong --- v10: - add the "reg" to the function arguments of emit_store_stack_imm64() - use the positive offset in emit_store_stack_imm64() - remove some unnecessary comment, as we already have proper comment in emit_store_stack_imm64() v9: - rename emit_st_r0_imm64() to emit_store_stack_imm64() --- arch/x86/net/bpf_jit_comp.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index e3b1c4b1d550..2f31331955b5 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -1300,6 +1300,16 @@ static void emit_st_r12(u8 **pprog, u32 size, u32 ds= t_reg, int off, int imm) emit_st_index(pprog, size, dst_reg, X86_REG_R12, off, imm); } =20 +static void emit_store_stack_imm64(u8 **pprog, int reg, int stack_off, u64= imm64) +{ + /* + * mov reg, imm64 + * mov QWORD PTR [rbp + stack_off], reg + */ + emit_mov_imm64(pprog, reg, imm64 >> 32, (u32) imm64); + emit_stx(pprog, BPF_DW, BPF_REG_FP, reg, stack_off); +} + static int emit_atomic_rmw(u8 **pprog, u32 atomic_op, u32 dst_reg, u32 src_reg, s16 off, u8 bpf_size) { @@ -3348,20 +3358,12 @@ static int __arch_prepare_bpf_trampoline(struct bpf= _tramp_image *im, void *rw_im /* mov QWORD PTR [rbp - rbx_off], rbx */ emit_stx(&prog, BPF_DW, BPF_REG_FP, BPF_REG_6, -rbx_off); =20 - /* Store number of argument registers of the traced function: - * mov rax, nr_regs - * mov QWORD PTR [rbp - nregs_off], rax - */ - emit_mov_imm64(&prog, BPF_REG_0, 0, (u32) nr_regs); - emit_stx(&prog, BPF_DW, BPF_REG_FP, BPF_REG_0, -nregs_off); + /* Store number of argument registers of the traced function */ + emit_store_stack_imm64(&prog, BPF_REG_0, -nregs_off, nr_regs); =20 if (flags & BPF_TRAMP_F_IP_ARG) { - /* Store IP address of the traced function: - * movabsq rax, func_addr - * mov QWORD PTR [rbp - ip_off], rax - */ - emit_mov_imm64(&prog, BPF_REG_0, (long) func_addr >> 32, (u32) (long) fu= nc_addr); - emit_stx(&prog, BPF_DW, BPF_REG_FP, BPF_REG_0, -ip_off); + /* Store IP address of the traced function */ + emit_store_stack_imm64(&prog, BPF_REG_0, -ip_off, (long)func_addr); } =20 save_args(m, &prog, regs_off, false, flags); --=20 2.52.0