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Message-Id: <1268842164-5590-11-git-send-email-orenl@cs.columbia.edu>
Date: Wed, 17 Mar 2010 12:07:58 -0400
From: Oren Laadan <orenl@...columbia.edu>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
linux-api@...r.kernel.org, Serge Hallyn <serue@...ibm.com>,
Ingo Molnar <mingo@...e.hu>,
containers@...ts.linux-foundation.org, Nathan Lynch <ntl@...ox.com>
Subject: [C/R v20][PATCH 10/96] eclone (10/11): Implement sys_eclone for powerpc
From: Nathan Lynch <ntl@...ox.com>
Wired up for both ppc32 and ppc64, but tested only with the latter.
Changelog:
- Jan 20: (ntl) fix 32-bit build
- Nov 17: (serge) remove redundant flags_high check, and
don't fold it into flags.
Signed-off-by: Nathan Lynch <ntl@...ox.com>
Signed-off-by: Serge E. Hallyn <serue@...ibm.com>
---
arch/powerpc/include/asm/syscalls.h | 6 ++++
arch/powerpc/include/asm/systbl.h | 1 +
arch/powerpc/include/asm/unistd.h | 3 +-
arch/powerpc/kernel/entry_32.S | 8 +++++
arch/powerpc/kernel/entry_64.S | 5 +++
arch/powerpc/kernel/process.c | 54 ++++++++++++++++++++++++++++++++++-
6 files changed, 75 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/include/asm/syscalls.h b/arch/powerpc/include/asm/syscalls.h
index eb8eb40..1674544 100644
--- a/arch/powerpc/include/asm/syscalls.h
+++ b/arch/powerpc/include/asm/syscalls.h
@@ -24,6 +24,12 @@ asmlinkage int sys_execve(unsigned long a0, unsigned long a1,
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long usp,
int __user *parent_tidp, void __user *child_threadptr,
int __user *child_tidp, int p6, struct pt_regs *regs);
+asmlinkage int sys_eclone(unsigned long flags_low,
+ struct clone_args __user *args,
+ size_t args_size,
+ pid_t __user *pids,
+ unsigned long p5, unsigned long p6,
+ struct pt_regs *regs);
asmlinkage int sys_fork(unsigned long p1, unsigned long p2,
unsigned long p3, unsigned long p4, unsigned long p5,
unsigned long p6, struct pt_regs *regs);
diff --git a/arch/powerpc/include/asm/systbl.h b/arch/powerpc/include/asm/systbl.h
index 07d2d19..ee41254 100644
--- a/arch/powerpc/include/asm/systbl.h
+++ b/arch/powerpc/include/asm/systbl.h
@@ -326,3 +326,4 @@ SYSCALL_SPU(perf_event_open)
COMPAT_SYS_SPU(preadv)
COMPAT_SYS_SPU(pwritev)
COMPAT_SYS(rt_tgsigqueueinfo)
+PPC_SYS(eclone)
diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index f6ca761..37357a2 100644
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -345,10 +345,11 @@
#define __NR_preadv 320
#define __NR_pwritev 321
#define __NR_rt_tgsigqueueinfo 322
+#define __NR_eclone 323
#ifdef __KERNEL__
-#define __NR_syscalls 323
+#define __NR_syscalls 324
#define __NR__exit __NR_exit
#define NR_syscalls __NR_syscalls
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 1175a85..579f1da 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -586,6 +586,14 @@ ppc_clone:
stw r0,_TRAP(r1) /* register set saved */
b sys_clone
+ .globl ppc_eclone
+ppc_eclone:
+ SAVE_NVGPRS(r1)
+ lwz r0,_TRAP(r1)
+ rlwinm r0,r0,0,0,30 /* clear LSB to indicate full */
+ stw r0,_TRAP(r1) /* register set saved */
+ b sys_eclone
+
.globl ppc_swapcontext
ppc_swapcontext:
SAVE_NVGPRS(r1)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index bdcb557..899f485 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -344,6 +344,11 @@ _GLOBAL(ppc_clone)
bl .sys_clone
b syscall_exit
+_GLOBAL(ppc_eclone)
+ bl .save_nvgprs
+ bl .sys_eclone
+ b syscall_exit
+
_GLOBAL(ppc32_swapcontext)
bl .save_nvgprs
bl .compat_sys_swapcontext
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 7b816da..4bbc21f 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -885,7 +885,59 @@ int sys_clone(unsigned long clone_flags, unsigned long usp,
child_tidp = TRUNC_PTR(child_tidp);
}
#endif
- return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
+ return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
+}
+
+int sys_eclone(unsigned long clone_flags_low,
+ struct clone_args __user *uclone_args,
+ size_t size,
+ pid_t __user *upids,
+ unsigned long p5, unsigned long p6,
+ struct pt_regs *regs)
+{
+ struct clone_args kclone_args;
+ unsigned long stack_base;
+ int __user *parent_tidp;
+ int __user *child_tidp;
+ unsigned long stack_sz;
+ unsigned int nr_pids;
+ unsigned long flags;
+ unsigned long usp;
+ int rc;
+
+ CHECK_FULL_REGS(regs);
+
+ rc = fetch_clone_args_from_user(uclone_args, size, &kclone_args);
+ if (rc)
+ return rc;
+
+ stack_sz = kclone_args.child_stack_size;
+ stack_base = kclone_args.child_stack;
+
+ /* powerpc doesn't do anything useful with the stack size */
+ if (stack_sz)
+ return -EINVAL;
+
+ /* Interpret stack_base as the child sp if it is set. */
+ usp = regs->gpr[1];
+ if (stack_base)
+ usp = stack_base;
+
+ flags = clone_flags_low;
+
+ nr_pids = kclone_args.nr_pids;
+
+ parent_tidp = (int __user *)(unsigned long)kclone_args.parent_tid_ptr;
+ child_tidp = (int __user *)(unsigned long)kclone_args.child_tid_ptr;
+
+#ifdef CONFIG_PPC64
+ if (test_thread_flag(TIF_32BIT)) {
+ parent_tidp = TRUNC_PTR(parent_tidp);
+ child_tidp = TRUNC_PTR(child_tidp);
+ }
+#endif
+ return do_fork_with_pids(flags, stack_base, regs, stack_sz,
+ parent_tidp, child_tidp, nr_pids, upids);
}
int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3,
--
1.6.3.3
--
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