From nobody Tue Sep 16 05:00:11 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 795E3C61DB3 for ; Mon, 9 Jan 2023 08:09:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233305AbjAIIJq (ORCPT ); Mon, 9 Jan 2023 03:09:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33766 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229785AbjAIIJm (ORCPT ); Mon, 9 Jan 2023 03:09:42 -0500 Received: from 1wt.eu (wtarreau.pck.nerim.net [62.212.114.60]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id B62A0BA6 for ; Mon, 9 Jan 2023 00:09:40 -0800 (PST) Received: (from willy@localhost) by pcw.home.local (8.15.2/8.15.2/Submit) id 30989Pl9026641; Mon, 9 Jan 2023 09:09:25 +0100 From: Willy Tarreau To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, Sven Schnelle , Willy Tarreau Subject: [PATCH 1/4] nolibc: add support for s390 Date: Mon, 9 Jan 2023 09:09:07 +0100 Message-Id: <20230109080910.26594-2-w@1wt.eu> X-Mailer: git-send-email 2.17.5 In-Reply-To: <20230109080910.26594-1-w@1wt.eu> References: <20230109080910.26594-1-w@1wt.eu> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Sven Schnelle Use arch-x86_64 as a template. Not really different, but we have our own mmap syscall which takes a structure instead of discrete arguments. Signed-off-by: Sven Schnelle Acked-by: Heiko Carstens Signed-off-by: Willy Tarreau --- tools/include/nolibc/arch-s390.h | 222 +++++++++++++++++++++++++++++++ tools/include/nolibc/arch.h | 2 + tools/include/nolibc/sys.h | 2 + 3 files changed, 226 insertions(+) create mode 100644 tools/include/nolibc/arch-s390.h diff --git a/tools/include/nolibc/arch-s390.h b/tools/include/nolibc/arch-s= 390.h new file mode 100644 index 000000000000..76bc8fdaf922 --- /dev/null +++ b/tools/include/nolibc/arch-s390.h @@ -0,0 +1,222 @@ +/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ +/* + * s390 specific definitions for NOLIBC + */ + +#ifndef _NOLIBC_ARCH_S390_H +#define _NOLIBC_ARCH_S390_H +#include + +/* O_* macros for fcntl/open are architecture-specific */ +#define O_RDONLY 0 +#define O_WRONLY 1 +#define O_RDWR 2 +#define O_CREAT 0x40 +#define O_EXCL 0x80 +#define O_NOCTTY 0x100 +#define O_TRUNC 0x200 +#define O_APPEND 0x400 +#define O_NONBLOCK 0x800 +#define O_DIRECTORY 0x10000 + +/* The struct returned by the stat() syscall, equivalent to stat64(). The + * syscall returns 116 bytes and stops in the middle of __unused. + */ + +struct sys_stat_struct { + unsigned long st_dev; + unsigned long st_ino; + unsigned long st_nlink; + unsigned int st_mode; + unsigned int st_uid; + unsigned int st_gid; + unsigned int __pad1; + unsigned long st_rdev; + unsigned long st_size; + unsigned long st_atime; + unsigned long st_atime_nsec; + unsigned long st_mtime; + unsigned long st_mtime_nsec; + unsigned long st_ctime; + unsigned long st_ctime_nsec; + unsigned long st_blksize; + long st_blocks; + unsigned long __unused[3]; +}; + +/* Syscalls for s390: + * - registers are 64-bit + * - syscall number is passed in r1 + * - arguments are in r2-r7 + * - the system call is performed by calling the svc instruction + * - syscall return value is in r2 + * - r1 and r2 are clobbered, others are preserved. + * + * Link s390 ABI: https://github.com/IBM/s390x-abi + * + */ + +#define my_syscall0(num) \ +({ \ + register long _num __asm__ ("1") =3D (num); \ + register long _rc __asm__ ("2"); \ + \ + __asm__ volatile ( \ + "svc 0\n" \ + : "=3Dd"(_rc) \ + : "d"(_num) \ + : "memory", "cc" \ + ); \ + _rc; \ +}) + +#define my_syscall1(num, arg1) \ +({ \ + register long _num __asm__ ("1") =3D (num); \ + register long _arg1 __asm__ ("2") =3D (long)(arg1); \ + \ + __asm__ volatile ( \ + "svc 0\n" \ + : "+d"(_arg1) \ + : "d"(_num) \ + : "memory", "cc" \ + ); \ + _arg1; \ +}) + +#define my_syscall2(num, arg1, arg2) \ +({ \ + register long _num __asm__ ("1") =3D (num); \ + register long _arg1 __asm__ ("2") =3D (long)(arg1); \ + register long _arg2 __asm__ ("3") =3D (long)(arg2); \ + \ + __asm__ volatile ( \ + "svc 0\n" \ + : "+d"(_arg1) \ + : "d"(_arg2), "d"(_num) \ + : "memory", "cc" \ + ); \ + _arg1; \ +}) + +#define my_syscall3(num, arg1, arg2, arg3) \ +({ \ + register long _num __asm__ ("1") =3D (num); \ + register long _arg1 __asm__ ("2") =3D (long)(arg1); \ + register long _arg2 __asm__ ("3") =3D (long)(arg2); \ + register long _arg3 __asm__ ("4") =3D (long)(arg3); \ + \ + __asm__ volatile ( \ + "svc 0\n" \ + : "+d"(_arg1) \ + : "d"(_arg2), "d"(_arg3), "d"(_num) \ + : "memory", "cc" \ + ); \ + _arg1; \ +}) + +#define my_syscall4(num, arg1, arg2, arg3, arg4) \ +({ \ + register long _num __asm__ ("1") =3D (num); \ + register long _arg1 __asm__ ("2") =3D (long)(arg1); \ + register long _arg2 __asm__ ("3") =3D (long)(arg2); \ + register long _arg3 __asm__ ("4") =3D (long)(arg3); \ + register long _arg4 __asm__ ("5") =3D (long)(arg4); \ + \ + __asm__ volatile ( \ + "svc 0\n" \ + : "+d"(_arg1) \ + : "d"(_arg2), "d"(_arg3), "d"(_arg4), "d"(_num) \ + : "memory", "cc" \ + ); \ + _arg1; \ +}) + +#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \ +({ \ + register long _num __asm__ ("1") =3D (num); \ + register long _arg1 __asm__ ("2") =3D (long)(arg1); \ + register long _arg2 __asm__ ("3") =3D (long)(arg2); \ + register long _arg3 __asm__ ("4") =3D (long)(arg3); \ + register long _arg4 __asm__ ("5") =3D (long)(arg4); \ + register long _arg5 __asm__ ("6") =3D (long)(arg5); \ + \ + __asm__ volatile ( \ + "svc 0\n" \ + : "+d"(_arg1) \ + : "d"(_arg2), "d"(_arg3), "d"(_arg4), "d"(_arg5), \ + "d"(_num) \ + : "memory", "cc" \ + ); \ + _arg1; \ +}) + +#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \ +({ \ + register long _num __asm__ ("1") =3D (num); \ + register long _arg1 __asm__ ("2") =3D (long)(arg1); \ + register long _arg2 __asm__ ("3") =3D (long)(arg2); \ + register long _arg3 __asm__ ("4") =3D (long)(arg3); \ + register long _arg4 __asm__ ("5") =3D (long)(arg4); \ + register long _arg5 __asm__ ("6") =3D (long)(arg5); \ + register long _arg6 __asm__ ("7") =3D (long)(arg6); \ + \ + __asm__ volatile ( \ + "svc 0\n" \ + : "+d"(_arg1) \ + : "d"(_arg2), "d"(_arg3), "d"(_arg4), "d"(_arg5), \ + "d"(_arg6), "d"(_num) \ + : "memory", "cc" \ + ); \ + _arg1; \ +}) + +/* startup code */ +__asm__ (".section .text\n" + ".weak _start\n" + "_start:\n" + "lg %r2,0(%r15)\n" /* argument count */ + "la %r3,8(%r15)\n" /* argument pointers */ + + "xgr %r0,%r0\n" /* r0 will be our NULL value */ + /* search for envp */ + "lgr %r4,%r3\n" /* start at argv */ + "0:\n" + "clg %r0,0(%r4)\n" /* entry zero? */ + "la %r4,8(%r4)\n" /* advance pointer */ + "jnz 0b\n" /* no -> test next pointer */ + /* yes -> r4 now contains start of envp */ + + "aghi %r15,-160\n" /* allocate new stackframe */ + "xc 0(8,%r15),0(%r15)\n" /* clear backchain */ + "brasl %r14,main\n" /* ret value of main is arg to exit */ + "lghi %r1,1\n" /* __NR_exit */ + "svc 0\n" + ""); + +struct s390_mmap_arg_struct { + unsigned long addr; + unsigned long len; + unsigned long prot; + unsigned long flags; + unsigned long fd; + unsigned long offset; +}; + +static __attribute__((unused)) +void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd, + off_t offset) +{ + struct s390_mmap_arg_struct args =3D { + .addr =3D (unsigned long)addr, + .len =3D (unsigned long)length, + .prot =3D prot, + .flags =3D flags, + .fd =3D fd, + .offset =3D (unsigned long)offset + }; + + return (void *)my_syscall1(__NR_mmap, &args); +} +#define sys_mmap sys_mmap +#endif // _NOLIBC_ARCH_S390_H diff --git a/tools/include/nolibc/arch.h b/tools/include/nolibc/arch.h index 4c6992321b0d..78b067a4fa47 100644 --- a/tools/include/nolibc/arch.h +++ b/tools/include/nolibc/arch.h @@ -27,6 +27,8 @@ #include "arch-mips.h" #elif defined(__riscv) #include "arch-riscv.h" +#elif defined(__s390x__) +#include "arch-s390.h" #endif =20 #endif /* _NOLIBC_ARCH_H */ diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h index 78473d34e27c..a42d7c405bdc 100644 --- a/tools/include/nolibc/sys.h +++ b/tools/include/nolibc/sys.h @@ -686,6 +686,7 @@ int mknod(const char *path, mode_t mode, dev_t dev) #define MAP_FAILED ((void *)-1) #endif =20 +#ifndef sys_mmap static __attribute__((unused)) void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset) @@ -707,6 +708,7 @@ void *sys_mmap(void *addr, size_t length, int prot, int= flags, int fd, return (void *)my_syscall6(n, addr, length, prot, flags, fd, offset); #endif } +#endif =20 static __attribute__((unused)) void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t o= ffset) --=20 2.17.5