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[PATCH 3/3] add the clone64() and unshare64() syscalls [message #29264 is a reply to message #29261] Wed, 09 April 2008 22:34 Go to previous messageGo to previous message
Sukadev Bhattiprolu is currently offline  Sukadev Bhattiprolu
Messages: 413
Registered: August 2006
Senior Member
 
From: Cedric Le Goater <clg@fr.ibm.com>
Subject: [PATCH 3/3] add the clone64() and unshare64() syscalls

This patch adds 2 new syscalls :

     long sys_clone64(unsigned long flags_high, unsigned long flags_low,
		unsigned long newsp);

     long sys_unshare64(unsigned long flags_high, unsigned long flags_low);

The current version of clone64() does not support CLONE_PARENT_SETTID and 
CLONE_CHILD_CLEARTID because we would exceed the 6 registers limit of some 
arches. It's possible to get around this limitation but we might not
need it as we already have clone()

Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>

---
 arch/powerpc/kernel/entry_32.S     |    8 ++++++++
 arch/powerpc/kernel/entry_64.S     |    5 +++++
 arch/powerpc/kernel/process.c      |   15 +++++++++++++++
 arch/s390/kernel/compat_linux.c    |   16 ++++++++++++++++
 arch/s390/kernel/compat_wrapper.S  |    6 ++++++
 arch/s390/kernel/process.c         |   15 +++++++++++++++
 arch/s390/kernel/syscalls.S        |    2 ++
 arch/x86/ia32/ia32entry.S          |    4 ++++
 arch/x86/ia32/sys_ia32.c           |   12 ++++++++++++
 arch/x86/kernel/entry_64.S         |    1 +
 arch/x86/kernel/process_32.c       |   14 ++++++++++++++
 arch/x86/kernel/process_64.c       |   15 +++++++++++++++
 arch/x86/kernel/syscall_table_32.S |    2 ++
 include/asm-powerpc/systbl.h       |    2 ++
 include/asm-powerpc/unistd.h       |    4 +++-
 include/asm-s390/unistd.h          |    4 +++-
 include/asm-x86/unistd_32.h        |    2 ++
 include/asm-x86/unistd_64.h        |    4 ++++
 include/linux/syscalls.h           |    3 +++
 kernel/fork.c                      |    7 +++++++
 kernel/sys_ni.c                    |    3 +++
 21 files changed, 142 insertions(+), 2 deletions(-)

Index: 2.6.25-rc2-mm1/arch/s390/kernel/syscalls.S
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/s390/kernel/syscalls.S	2008-02-27 15:17:34.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/s390/kernel/syscalls.S	2008-03-06 22:08:49.000000000 -0800
@@ -330,3 +330,5 @@ SYSCALL(sys_eventfd,sys_eventfd,sys_even
 SYSCALL(sys_timerfd_create,sys_timerfd_create,sys_timerfd_create_wrapper)
 SYSCALL(sys_timerfd_settime,sys_timerfd_settime,compat_sys_timerfd_settime_wrapper) /* 320 */
 SYSCALL(sys_timerfd_gettime,sys_timerfd_gettime,compat_sys_timerfd_gettime_wrapper)
+SYSCALL(sys_clone64,sys_clone64,sys32_clone64)
+SYSCALL(sys_unshare64,sys_unshare64,sys_unshare64_wrapper)
Index: 2.6.25-rc2-mm1/arch/x86/kernel/syscall_table_32.S
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/x86/kernel/syscall_table_32.S	2008-02-27 15:17:35.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/x86/kernel/syscall_table_32.S	2008-03-06 22:08:49.000000000 -0800
@@ -326,3 +326,5 @@ ENTRY(sys_call_table)
 	.long sys_fallocate
 	.long sys_timerfd_settime	/* 325 */
 	.long sys_timerfd_gettime
+	.long sys_clone64
+	.long sys_unshare64
Index: 2.6.25-rc2-mm1/include/asm-powerpc/systbl.h
===================================================================
--- 2.6.25-rc2-mm1.orig/include/asm-powerpc/systbl.h	2008-02-27 15:18:12.000000000 -0800
+++ 2.6.25-rc2-mm1/include/asm-powerpc/systbl.h	2008-03-06 22:08:49.000000000 -0800
@@ -316,3 +316,5 @@ COMPAT_SYS(fallocate)
 SYSCALL(subpage_prot)
 COMPAT_SYS_SPU(timerfd_settime)
 COMPAT_SYS_SPU(timerfd_gettime)
+PPC_SYS(clone64)
+SYSCALL_SPU(unshare64)
Index: 2.6.25-rc2-mm1/include/asm-powerpc/unistd.h
===================================================================
--- 2.6.25-rc2-mm1.orig/include/asm-powerpc/unistd.h	2008-02-27 15:18:12.000000000 -0800
+++ 2.6.25-rc2-mm1/include/asm-powerpc/unistd.h	2008-03-06 22:08:49.000000000 -0800
@@ -335,10 +335,12 @@
 #define __NR_subpage_prot	310
 #define __NR_timerfd_settime	311
 #define __NR_timerfd_gettime	312
+#define __NR_clone64		313
+#define __NR_unshare64		314
 
 #ifdef __KERNEL__
 
-#define __NR_syscalls		313
+#define __NR_syscalls		315
 
 #define __NR__exit __NR_exit
 #define NR_syscalls	__NR_syscalls
Index: 2.6.25-rc2-mm1/include/asm-s390/unistd.h
===================================================================
--- 2.6.25-rc2-mm1.orig/include/asm-s390/unistd.h	2008-02-27 15:18:13.000000000 -0800
+++ 2.6.25-rc2-mm1/include/asm-s390/unistd.h	2008-03-06 22:08:49.000000000 -0800
@@ -259,7 +259,9 @@
 #define __NR_timerfd_create	319
 #define __NR_timerfd_settime	320
 #define __NR_timerfd_gettime	321
-#define NR_syscalls 322
+#define __NR_clone64		322
+#define __NR_unshare64		323
+#define NR_syscalls 324
 
 /* 
  * There are some system calls that are not present on 64 bit, some
Index: 2.6.25-rc2-mm1/include/asm-x86/unistd_32.h
===================================================================
--- 2.6.25-rc2-mm1.orig/include/asm-x86/unistd_32.h	2008-02-27 15:18:16.000000000 -0800
+++ 2.6.25-rc2-mm1/include/asm-x86/unistd_32.h	2008-03-06 22:08:49.000000000 -0800
@@ -332,6 +332,8 @@
 #define __NR_fallocate		324
 #define __NR_timerfd_settime	325
 #define __NR_timerfd_gettime	326
+#define __NR_clone64		327
+#define __NR_unshare64		328
 
 #ifdef __KERNEL__
 
Index: 2.6.25-rc2-mm1/include/asm-x86/unistd_64.h
===================================================================
--- 2.6.25-rc2-mm1.orig/include/asm-x86/unistd_64.h	2008-02-27 15:18:16.000000000 -0800
+++ 2.6.25-rc2-mm1/include/asm-x86/unistd_64.h	2008-03-06 22:08:49.000000000 -0800
@@ -639,6 +639,10 @@ __SYSCALL(__NR_fallocate, sys_fallocate)
 __SYSCALL(__NR_timerfd_settime, sys_timerfd_settime)
 #define __NR_timerfd_gettime			287
 __SYSCALL(__NR_timerfd_gettime, sys_timerfd_gettime)
+#define __NR_clone64		288
+__SYSCALL(__NR_clone64, stub_clone64)
+#define __NR_unshare64		289
+__SYSCALL(__NR_unshare64,	sys_unshare64)
 
 
 #ifndef __NO_STUBS
Index: 2.6.25-rc2-mm1/include/linux/syscalls.h
===================================================================
--- 2.6.25-rc2-mm1.orig/include/linux/syscalls.h	2008-02-27 15:18:18.000000000 -0800
+++ 2.6.25-rc2-mm1/include/linux/syscalls.h	2008-03-06 22:08:49.000000000 -0800
@@ -615,6 +615,9 @@ asmlinkage long sys_timerfd_gettime(int 
 asmlinkage long sys_eventfd(unsigned int count);
 asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len);
 
+asmlinkage long sys_unshare64(unsigned long clone_flags_high,
+			      unsigned long clone_flags_low);
+
 int kernel_execve(const char *filename, char *const argv[], char *const envp[]);
 
 #endif
Index: 2.6.25-rc2-mm1/kernel/sys_ni.c
===================================================================
--- 2.6.25-rc2-mm1.orig/kernel/sys_ni.c	2008-02-27 15:18:23.000000000 -0800
+++ 2.6.25-rc2-mm1/kernel/sys_ni.c	2008-03-06 22:08:49.000000000 -0800
@@ -161,3 +161,6 @@ cond_syscall(sys_timerfd_gettime);
 cond_syscall(compat_sys_timerfd_settime);
 cond_syscall(compat_sys_timerfd_gettime);
 cond_syscall(sys_eventfd);
+
+cond_syscall(sys_clone64);
+cond_syscall(sys_unshare64);
Index: 2.6.25-rc2-mm1/arch/x86/kernel/process_32.c
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/x86/kernel/process_32.c	2008-03-06 22:08:49.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/x86/kernel/process_32.c	2008-03-06 22:08:49.000000000 -0800
@@ -771,6 +771,20 @@ asmlinkage int sys_clone(struct pt_regs 
 	return do_fork(clone_flags, newsp, &regs, 0, parent_tidptr, child_tidptr);
 }
 
+asmlinkage int sys_clone64(struct pt_regs regs)
+{
+	u64 clone_flags;
+	unsigned long newsp;
+
+	clone_flags = ((u64) regs.bx << 32 | regs.cx);
+	clone_flags &= ~(CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID);
+
+	newsp = regs.dx;
+	if (!newsp)
+		newsp = regs.sp;
+	return do_fork(clone_flags, newsp, &regs, 0, NULL, NULL);
+}
+
 /*
  * This is trivial, and on the face of it looks like it
  * could equally well be done in user mode.
Index: 2.6.25-rc2-mm1/arch/x86/kernel/process_64.c
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/x86/kernel/process_64.c	2008-03-06 22:08:49.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/x86/kernel/process_64.c	2008-03-06 22:08:49.000000000 -0800
@@ -775,6 +775,21 @@ sys_clone(unsigned long clone_flags, uns
 	return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
 }
 
+asmlinkage long
+sys_clone64(unsigned long clone_flags_high, unsigned long clone_flags_low,
+	  unsigned long newsp, struct pt_regs *regs)
+{
+	u64 clone_flags;
+
+	clone_flags = ((u64) clone_flags_high << 32 | clone_flags_low);
+	clone_flags &= ~(CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID);
+
+	if (!newsp)
+		newsp = regs->sp;
+	return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
+}
+
+
 /*
  * This is trivial, and on the face of it looks like it
  * could equally well be done in user mode.
Index: 2.6.25-rc2-mm1/arch/s390/kernel/compat_linux.c
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/s390/kernel/compat_linux.c	2008-01-26 09:48:58.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/s390/kernel/compat_linux.c	2008-03-06 22:08:49.000000000 -0800
@@ -940,6 +940,22 @@ asmlinkage long sys32_clone(void)
 		       parent_tidptr, child_tidptr);
 }
 
+asmlinkage long sys32_clone64(void)
+{
+	struct pt_regs *regs = task_pt_regs(current);
+	u64 clone_flags;
+	unsigned long newsp;
+
+	clone_flags = ((u64) (regs->orig_gpr2  & 0xffffffffUL) << 32 |
+		       (regs->gprs[3]  & 0xffffffffUL));
+	clone_flags &= ~(CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID);
+
+	newsp = regs->gprs[4] & 0x7fffffffUL;
+	if (!newsp)
+		newsp = regs->gprs[15];
+	return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
+}
+
 /*
  * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
  * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
Index: 2.6.25-rc2-mm1/arch/s390/kernel/process.c
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/s390/kernel/p
 ...

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