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From: Adhemerval Zanella <azanella@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] s390: Add the clone3 wrapper Date: Thu, 13 Jul 2023 13:50:38 +0000 (GMT) [thread overview] Message-ID: <20230713135038.E0F0A3858D32@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=721f30116ce653fffb0156e1298c8063833396e3 commit 721f30116ce653fffb0156e1298c8063833396e3 Author: Adhemerval Zanella <adhemerval.zanella@linaro.org> Date: Thu Jul 13 10:26:34 2023 -0300 s390: Add the clone3 wrapper It follows the internal signature: extern int clone3 (struct clone_args *__cl_args, size_t __size, int (*__func) (void *__arg), void *__arg); Checked on s390x-linux-gnu and s390-linux-gnu. Diff: --- sysdeps/unix/sysv/linux/s390/s390-32/clone3.S | 78 +++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/s390/s390-64/clone3.S | 78 +++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/s390/sysdep.h | 1 + 3 files changed, 157 insertions(+) diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/clone3.S b/sysdeps/unix/sysv/linux/s390/s390-32/clone3.S new file mode 100644 index 0000000000..bbe75ce893 --- /dev/null +++ b/sysdeps/unix/sysv/linux/s390/s390-32/clone3.S @@ -0,0 +1,78 @@ +/* The clone3 syscall wrapper. Linux/s390x version. + Copyright (C) 2023 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#define _ERRNO_H 1 +#include <bits/errno.h> + +/* The userland implementation is: + int clone3 (struct clone_args *cl_args, size_t size, + int (*func)(void *arg), void *arg); + + the kernel entry is: + int clone3 (struct clone_args *cl_args, size_t size); + + The parameters are passed in registers from userland: + r2: cl_args + r3: size + r4: func + r5: arg */ + + .text +ENTRY(__clone3) + /* Sanity check args. */ + ltr %r2, %r2 + je error + ltr %r4, %r4 + je error + + /* Do the system call, the kernel expects: + r1: system call number + r2: cl_args + r3: size */ + lhi %r1, SYS_ify(clone3) + svc 0 + ltr %r2,%r2 /* check return code */ + jz thread_start + jm SYSCALL_ERROR_LABEL + br %r14 +error: + lhi %r2,-EINVAL + j SYSCALL_ERROR_LABEL +PSEUDO_END (__clone3) + + .align 16 + .type thread_start, %function +thread_start: + cfi_startproc + /* Mark r14 as undefined in order to stop unwinding here. */ + cfi_undefined (r14) + + /* func is in gpr 4, arg in gpr 5. */ + lr %r2, %r5 + ahi %r15, -96 + xc 0(4,%r15),0(%r15) + basr %r14, %r4 + + DO_CALL (exit, 1) + cfi_endproc + ASM_SIZE_DIRECTIVE (thread_start) + +libc_hidden_def (__clone3) +weak_alias (__clone3, clone3) diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/clone3.S b/sysdeps/unix/sysv/linux/s390/s390-64/clone3.S new file mode 100644 index 0000000000..62800f8ef3 --- /dev/null +++ b/sysdeps/unix/sysv/linux/s390/s390-64/clone3.S @@ -0,0 +1,78 @@ +/* The clone3 syscall wrapper. Linux/s390x version. + Copyright (C) 2023 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#define _ERRNO_H 1 +#include <bits/errno.h> + +/* The userland implementation is: + int clone3 (struct clone_args *cl_args, size_t size, + int (*func)(void *arg), void *arg); + + the kernel entry is: + int clone3 (struct clone_args *cl_args, size_t size); + + The parameters are passed in registers from userland: + r2: cl_args + r3: size + r4: func + r5: arg */ + + .text +ENTRY(__clone3) + /* Sanity check args. */ + ltgr %r2, %r2 + je error + ltgr %r4, %r4 + je error + + /* Do the system call, the kernel expects: + r1: system call number + r2: cl_args + r3: size */ + lghi %r1, SYS_ify(clone3) + svc 0 + ltgr %r2,%r2 /* check return code */ + jz thread_start + jgm SYSCALL_ERROR_LABEL + br %r14 +error: + lghi %r2,-EINVAL + jg SYSCALL_ERROR_LABEL +PSEUDO_END (__clone3) + + .align 16 + .type thread_start, %function +thread_start: + cfi_startproc + /* Mark r14 as undefined in order to stop unwinding here. */ + cfi_undefined (r14) + + /* func is in gpr 4, arg in gpr 5. */ + lgr %r2, %r5 + aghi %r15, -160 + xc 0(8,%r15),0(%r15) + basr %r14, %r4 + + DO_CALL (exit, 1) + cfi_endproc + ASM_SIZE_DIRECTIVE (thread_start) + +libc_hidden_def (__clone3) +weak_alias (__clone3, clone3) diff --git a/sysdeps/unix/sysv/linux/s390/sysdep.h b/sysdeps/unix/sysv/linux/s390/sysdep.h index 3bde8ba19c..b2621630f0 100644 --- a/sysdeps/unix/sysv/linux/s390/sysdep.h +++ b/sysdeps/unix/sysv/linux/s390/sysdep.h @@ -79,4 +79,5 @@ #define HAVE_GETTIMEOFDAY_VSYSCALL "__kernel_gettimeofday" #define HAVE_GETCPU_VSYSCALL "__kernel_getcpu" +#define HAVE_CLONE3_WRAPPER 1 #endif
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