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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2023-07-13 10:26:34 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2023-07-13 10:26:34 -0300
commit721f30116ce653fffb0156e1298c8063833396e3 (patch)
treea4503cd3b23efa11ac63a5d6b5bc4342aa476679
parent6cf4ebe10c6f0f60cdfce98f5a0ec7c5ceb987df (diff)
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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.
-rw-r--r--sysdeps/unix/sysv/linux/s390/s390-32/clone3.S78
-rw-r--r--sysdeps/unix/sysv/linux/s390/s390-64/clone3.S78
-rw-r--r--sysdeps/unix/sysv/linux/s390/sysdep.h1
3 files changed, 157 insertions, 0 deletions
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 0000000..bbe75ce
--- /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 0000000..62800f8
--- /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 3bde8ba..b262163 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