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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.
This commit is contained in:
Adhemerval Zanella
parent
6cf4ebe10c
commit
721f30116c
3 changed files with 157 additions and 0 deletions
78
sysdeps/unix/sysv/linux/s390/s390-32/clone3.S
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78
sysdeps/unix/sysv/linux/s390/s390-32/clone3.S
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@ -0,0 +1,78 @@
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/* The clone3 syscall wrapper. Linux/s390x version.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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/* The userland implementation is:
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int clone3 (struct clone_args *cl_args, size_t size,
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int (*func)(void *arg), void *arg);
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the kernel entry is:
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int clone3 (struct clone_args *cl_args, size_t size);
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The parameters are passed in registers from userland:
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r2: cl_args
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r3: size
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r4: func
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r5: arg */
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.text
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ENTRY(__clone3)
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/* Sanity check args. */
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ltr %r2, %r2
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je error
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ltr %r4, %r4
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je error
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/* Do the system call, the kernel expects:
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r1: system call number
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r2: cl_args
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r3: size */
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lhi %r1, SYS_ify(clone3)
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svc 0
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ltr %r2,%r2 /* check return code */
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jz thread_start
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jm SYSCALL_ERROR_LABEL
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br %r14
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error:
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lhi %r2,-EINVAL
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j SYSCALL_ERROR_LABEL
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PSEUDO_END (__clone3)
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.align 16
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.type thread_start, %function
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thread_start:
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cfi_startproc
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/* Mark r14 as undefined in order to stop unwinding here. */
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cfi_undefined (r14)
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/* func is in gpr 4, arg in gpr 5. */
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lr %r2, %r5
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ahi %r15, -96
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xc 0(4,%r15),0(%r15)
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basr %r14, %r4
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DO_CALL (exit, 1)
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cfi_endproc
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ASM_SIZE_DIRECTIVE (thread_start)
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libc_hidden_def (__clone3)
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weak_alias (__clone3, clone3)
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78
sysdeps/unix/sysv/linux/s390/s390-64/clone3.S
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78
sysdeps/unix/sysv/linux/s390/s390-64/clone3.S
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@ -0,0 +1,78 @@
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/* The clone3 syscall wrapper. Linux/s390x version.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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/* The userland implementation is:
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int clone3 (struct clone_args *cl_args, size_t size,
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int (*func)(void *arg), void *arg);
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the kernel entry is:
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int clone3 (struct clone_args *cl_args, size_t size);
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The parameters are passed in registers from userland:
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r2: cl_args
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r3: size
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r4: func
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r5: arg */
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.text
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ENTRY(__clone3)
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/* Sanity check args. */
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ltgr %r2, %r2
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je error
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ltgr %r4, %r4
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je error
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/* Do the system call, the kernel expects:
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r1: system call number
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r2: cl_args
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r3: size */
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lghi %r1, SYS_ify(clone3)
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svc 0
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ltgr %r2,%r2 /* check return code */
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jz thread_start
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jgm SYSCALL_ERROR_LABEL
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br %r14
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error:
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lghi %r2,-EINVAL
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jg SYSCALL_ERROR_LABEL
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PSEUDO_END (__clone3)
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.align 16
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.type thread_start, %function
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thread_start:
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cfi_startproc
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/* Mark r14 as undefined in order to stop unwinding here. */
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cfi_undefined (r14)
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/* func is in gpr 4, arg in gpr 5. */
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lgr %r2, %r5
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aghi %r15, -160
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xc 0(8,%r15),0(%r15)
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basr %r14, %r4
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DO_CALL (exit, 1)
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cfi_endproc
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ASM_SIZE_DIRECTIVE (thread_start)
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libc_hidden_def (__clone3)
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weak_alias (__clone3, clone3)
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@ -79,4 +79,5 @@
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#define HAVE_GETTIMEOFDAY_VSYSCALL "__kernel_gettimeofday"
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#define HAVE_GETCPU_VSYSCALL "__kernel_getcpu"
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#define HAVE_CLONE3_WRAPPER 1
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#endif
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