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Subject[PATCH v18 80/80] powerpc: clone_with_pids implementation
Date
From: Nathan Lynch <ntl@pobox.com>

Mostly copy-paste from existing clone code.

(may want to hold off applying this until the ongoing clone_with_pids
discussion is resolved.)

Signed-off-by: Nathan Lynch <ntl@pobox.com>
---
arch/powerpc/include/asm/syscalls.h | 4 ++++
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 | 20 +++++++++++++++++++-
6 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/syscalls.h b/arch/powerpc/include/asm/syscalls.h
index eb8eb40..25dfe8b 100644
--- a/arch/powerpc/include/asm/syscalls.h
+++ b/arch/powerpc/include/asm/syscalls.h
@@ -24,6 +24,10 @@ 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_clone_with_pids(unsigned long clone_flags,
+ unsigned long usp, int __user *parent_tidp,
+ void __user *child_threadptr, int __user *child_tidp,
+ void __user *upid_setp, 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 3d44cf3..e3c0b96 100644
--- a/arch/powerpc/include/asm/systbl.h
+++ b/arch/powerpc/include/asm/systbl.h
@@ -328,3 +328,4 @@ COMPAT_SYS_SPU(pwritev)
COMPAT_SYS(rt_tgsigqueueinfo)
SYSCALL(checkpoint)
SYSCALL(restart)
+PPC_SYS(clone_with_pids)
diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index ef41ebb..c54db8b 100644
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -347,10 +347,11 @@
#define __NR_rt_tgsigqueueinfo 322
#define __NR_checkpoint 323
#define __NR_restart 324
+#define __NR_clone_with_pids 325

#ifdef __KERNEL__

-#define __NR_syscalls 325
+#define __NR_syscalls 326

#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 3cadba6..081dd36 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_clone_with_pids
+ppc_clone_with_pids:
+ 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_clone_with_pids
+
.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 43e0734..39fa316 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -320,6 +320,11 @@ _GLOBAL(ppc_clone)
bl .sys_clone
b syscall_exit

+_GLOBAL(ppc_clone_with_pids)
+ bl .save_nvgprs
+ bl .sys_clone_with_pids
+ 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 892a9f2..7bf21cc 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -895,7 +895,25 @@ 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_clone_with_pids(unsigned long clone_flags, unsigned long usp,
+ int __user *parent_tidp, void __user *child_threadptr,
+ int __user *child_tidp, void __user *upid_setp,
+ struct pt_regs *regs)
+{
+ CHECK_FULL_REGS(regs);
+ if (usp == 0)
+ usp = regs->gpr[1];
+#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(clone_flags, usp, regs, 0,
+ parent_tidp, child_tidp, upid_setp);
}

int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3,
--
1.6.0.4


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