From nobody Sat Feb 7 05:01:25 2026 Received: from sipsolutions.net (s3.sipsolutions.net [168.119.38.16]) (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 385DE2D7DD0; Mon, 15 Sep 2025 07:22:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=168.119.38.16 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757920935; cv=none; b=LFcskZmFkPspvAYqzs6zGzzL8D4fXYVvzJaCU1B2CMVJ5n8i2mxdi8TqeUKEx0/bVP2SGYYd+67i0kw8Qy8tO2hVXKTOD8vipmZnDBA8Wj+GE2Zm7pCtJSXdXiueGFpWwXNBnqkTGmZY+V2WpncXSW+q/VyHoHzwk1CosXpTD3o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757920935; c=relaxed/simple; bh=D1njsi3Dc3pm+FEmPaeoan3fmVED/gaa/845805VSmQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BeAlElPuBC0l7eV0c50WVTjep0MzeJW+yl81rdYiM26HZzJxq+d5zapy08VVHKLfTJJLuvL/zLldhoWEJ9mmkUILvGUedEg6Hq/oPNbiaj7J2gRgiNLgZ4jMDPxxfFdEkhzH/smYGSrRYeg+Ckomt5McgfjCxtVm0G3tx3KcJHY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sipsolutions.net; spf=pass smtp.mailfrom=sipsolutions.net; dkim=pass (2048-bit key) header.d=sipsolutions.net header.i=@sipsolutions.net header.b=OjpYR4o0; arc=none smtp.client-ip=168.119.38.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sipsolutions.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sipsolutions.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sipsolutions.net header.i=@sipsolutions.net header.b="OjpYR4o0" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sipsolutions.net; s=mail; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Content-Type:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-To: Resent-Cc:Resent-Message-ID; bh=EzGYOyHyBK8XRCpIi1QlHK5VKphrWANC8ROrsS0E19Q=; t=1757920933; x=1759130533; b=OjpYR4o0tQBaelHAEQh4eaJY/Y0hlVFkY+foOTsAQpfQWbC r9QZWxa0Jz3zVpSM1mYawHZ1B8JwKIPFxyPVpvokiOcH44kkyru9QXYRSbKgyu41TZrz/3aqtWI/d 3+5YuIg5b4Pbe5OfMiwHDmZc0wwQRdHX7q0T1VxB+5IRHZaEPv6z7hr4GxLn9vYvupczLTItgh55d e4qfwHyqKbtol5U/Gz6vn0+ElwgJgNFPkb57js4WGCWPXe4KcYxPvVldl/+pfE8yK2T2dh5kqph0d gvl8niGNcQfjcg9KfDd7yAxNVkKg+orl6FZF0VCYILu9t+r9F95eB5jYbPt2/SRg==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.98.2) (envelope-from ) id 1uy3XO-00000005w6o-0YuW; Mon, 15 Sep 2025 09:22:10 +0200 From: Benjamin Berg To: linux-um@lists.infradead.org, Willy Tarreau , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , linux-kselftest@vger.kernel.org, Arnaldo Carvalho de Melo Cc: linux-kernel@vger.kernel.org, Tiwei Bie , Benjamin Berg Subject: [PATCH 9/9] um: switch ptrace FP register access to nolibc Date: Mon, 15 Sep 2025 09:11:15 +0200 Message-ID: <20250915071115.1429196-10-benjamin@sipsolutions.net> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250915071115.1429196-1-benjamin@sipsolutions.net> References: <20250915071115.1429196-1-benjamin@sipsolutions.net> 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" From: Benjamin Berg The registers.c file only contain the routines for floating point register access in ptrace mode and initial size detection. The file can be moved over to nolibc by replacing the ptrace libc call with a simple wrapper that does a direct syscall. Signed-off-by: Benjamin Berg --- arch/x86/um/os-Linux/Makefile | 5 ++++- arch/x86/um/os-Linux/registers.c | 22 ++++++++-------------- 2 files changed, 12 insertions(+), 15 deletions(-) diff --git a/arch/x86/um/os-Linux/Makefile b/arch/x86/um/os-Linux/Makefile index 77a308aaa5ec..d37320430822 100644 --- a/arch/x86/um/os-Linux/Makefile +++ b/arch/x86/um/os-Linux/Makefile @@ -3,10 +3,13 @@ # Licensed under the GPL # =20 -obj-y =3D registers.o mcontext.o +obj-y =3D mcontext.o =20 obj-$(CONFIG_X86_32) +=3D tls.o =20 USER_OBJS :=3D $(obj-y) =20 +obj-y +=3D registers.o +NOLIBC_OBJS :=3D registers.o + include $(srctree)/arch/um/scripts/Makefile.rules diff --git a/arch/x86/um/os-Linux/registers.c b/arch/x86/um/os-Linux/regist= ers.c index eb1cdadc8a61..55bce0d3f5d2 100644 --- a/arch/x86/um/os-Linux/registers.c +++ b/arch/x86/um/os-Linux/registers.c @@ -6,18 +6,20 @@ =20 #include #include -#include +#include #ifdef __i386__ #include #endif #include #include -#include +#include #include #include #include #include =20 +#define my_ptrace(...) my_syscall4(__NR_ptrace, __VA_ARGS__) + static unsigned long ptrace_regset; unsigned long host_fp_size; =20 @@ -28,9 +30,7 @@ int get_fp_registers(int pid, unsigned long *regs) .iov_len =3D host_fp_size, }; =20 - if (ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov) < 0) - return -errno; - return 0; + return my_ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov); } =20 int put_fp_registers(int pid, unsigned long *regs) @@ -40,9 +40,7 @@ int put_fp_registers(int pid, unsigned long *regs) .iov_len =3D host_fp_size, }; =20 - if (ptrace(PTRACE_SETREGSET, pid, ptrace_regset, &iov) < 0) - return -errno; - return 0; + return my_ptrace(PTRACE_SETREGSET, pid, ptrace_regset, &iov); } =20 int arch_init_registers(int pid) @@ -60,9 +58,7 @@ int arch_init_registers(int pid) =20 /* GDB has x86_xsave_length, which uses x86_cpuid_count */ ptrace_regset =3D NT_X86_XSTATE; - ret =3D ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov); - if (ret) - ret =3D -errno; + ret =3D my_ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov); =20 if (ret =3D=3D -ENODEV) { #ifdef CONFIG_X86_32 @@ -71,9 +67,7 @@ int arch_init_registers(int pid) ptrace_regset =3D NT_PRFPREG; #endif iov.iov_len =3D 2 * 1024 * 1024; - ret =3D ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov); - if (ret) - ret =3D -errno; + ret =3D my_ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov); } =20 munmap(iov.iov_base, 2 * 1024 * 1024); --=20 2.51.0