4 files changed, 65 insertions, 58 deletions

diff --git a/arch/ppc64/kernel/kprobes.c b/arch/ppc64/kernel/kprobes.c
index 103daaf7357..e950a2058a1 100644
--- a/arch/ppc64/kernel/kprobes.c
+++ b/arch/ppc64/kernel/kprobes.c
@@ -45,12 +45,17 @@ static struct pt_regs jprobe_saved_regs;
 
 int arch_prepare_kprobe(struct kprobe *p)
 {
+	int ret = 0;
 	kprobe_opcode_t insn = *p->addr;
 
-	if (IS_MTMSRD(insn) || IS_RFID(insn))
-		/* cannot put bp on RFID/MTMSRD */
-		return 1;
-	return 0;
+	if ((unsigned long)p->addr & 0x03) {
+		printk("Attempt to register kprobe at an unaligned address\n");
+		ret = -EINVAL;
+	} else if (IS_MTMSRD(insn) || IS_RFID(insn)) {
+		printk("Cannot register a kprobe on rfid or mtmsrd\n");
+		ret = -EINVAL;
+	}
+	return ret;
 }
 
 void arch_copy_kprobe(struct kprobe *p)
@@ -172,8 +177,6 @@ static void resume_execution(struct kprobe *p, struct pt_regs *regs)
 	ret = emulate_step(regs, p->ainsn.insn[0]);
 	if (ret == 0)
 		regs->nip = (unsigned long)p->addr + 4;
-
-	regs->msr &= ~MSR_SE;
 }
 
 static inline int post_kprobe_handler(struct pt_regs *regs)
@@ -210,6 +213,7 @@ static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
 
 	if (kprobe_status & KPROBE_HIT_SS) {
 		resume_execution(current_kprobe, regs);
+		regs->msr &= ~MSR_SE;
 		regs->msr |= kprobe_saved_msr;
 
 		unlock_kprobes();
@@ -233,8 +237,6 @@ int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val,
 	 */
 	preempt_disable();
 	switch (val) {
-	case DIE_IABR_MATCH:
-	case DIE_DABR_MATCH:
 	case DIE_BPT:
 		if (kprobe_handler(args->regs))
 			ret = NOTIFY_STOP;
diff --git a/arch/ppc64/kernel/misc.S b/arch/ppc64/kernel/misc.S
index b944717c1db..e3c73b3425d 100644
--- a/arch/ppc64/kernel/misc.S
+++ b/arch/ppc64/kernel/misc.S
@@ -792,7 +792,7 @@ _GLOBAL(sys_call_table32)
 	.llong .compat_sys_newstat
 	.llong .compat_sys_newlstat
 	.llong .compat_sys_newfstat
-	.llong .sys_uname
+	.llong .sys32_uname
 	.llong .sys_ni_syscall		/* 110 old iopl syscall */
 	.llong .sys_vhangup
 	.llong .sys_ni_syscall		/* old idle syscall */
diff --git a/arch/ppc64/kernel/sys_ppc32.c b/arch/ppc64/kernel/sys_ppc32.c
index 7cf7a960002..9c8e317c598 100644
--- a/arch/ppc64/kernel/sys_ppc32.c
+++ b/arch/ppc64/kernel/sys_ppc32.c
@@ -791,31 +791,6 @@ asmlinkage int sys32_pciconfig_iobase(u32 which, u32 in_bus, u32 in_devfn)
 }
 
 
-asmlinkage int ppc64_newuname(struct new_utsname __user * name)
-{
-	int errno = sys_newuname(name);
-
-	if (current->personality == PER_LINUX32 && !errno) {
-		if(copy_to_user(name->machine, "ppc\0\0", 8)) {
-			errno = -EFAULT;
-		}
-	}
-	return errno;
-}
-
-asmlinkage int ppc64_personality(unsigned long personality)
-{
-	int ret;
-	if (current->personality == PER_LINUX32 && personality == PER_LINUX)
-		personality = PER_LINUX32;
-	ret = sys_personality(personality);
-	if (ret == PER_LINUX32)
-		ret = PER_LINUX;
-	return ret;
-}
-
-
-
 /* Note: it is necessary to treat mode as an unsigned int,
  * with the corresponding cast to a signed int to insure that the 
  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
@@ -1158,26 +1133,47 @@ asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
 }
 #endif
 
+asmlinkage int sys32_uname(struct old_utsname __user * name)
+{
+	int err = 0;
+	
+	down_read(&uts_sem);
+	if (copy_to_user(name, &system_utsname, sizeof(*name)))
+		err = -EFAULT;
+	up_read(&uts_sem);
+	if (!err && personality(current->personality) == PER_LINUX32) {
+		/* change "ppc64" to "ppc" */
+		if (__put_user(0, name->machine + 3)
+		    || __put_user(0, name->machine + 4))
+			err = -EFAULT;
+	}
+	return err;
+}
+
 asmlinkage int sys32_olduname(struct oldold_utsname __user * name)
 {
 	int error;
-	
-	if (!name)
-		return -EFAULT;
+
 	if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
 		return -EFAULT;
   
 	down_read(&uts_sem);
 	error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
-	error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
-	error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
-	error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
-	error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
-	error -= __put_user(0,name->release+__OLD_UTS_LEN);
-	error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
-	error -= __put_user(0,name->version+__OLD_UTS_LEN);
-	error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
-	error = __put_user(0,name->machine+__OLD_UTS_LEN);
+	error |= __put_user(0,name->sysname+__OLD_UTS_LEN);
+	error |= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
+	error |= __put_user(0,name->nodename+__OLD_UTS_LEN);
+	error |= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
+	error |= __put_user(0,name->release+__OLD_UTS_LEN);
+	error |= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
+	error |= __put_user(0,name->version+__OLD_UTS_LEN);
+	error |= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
+	error |= __put_user(0,name->machine+__OLD_UTS_LEN);
+	if (personality(current->personality) == PER_LINUX32) {
+		/* change "ppc64" to "ppc" */
+		error |= __put_user(0, name->machine + 3);
+		error |= __put_user(0, name->machine + 4);
+	}
+	
 	up_read(&uts_sem);
 
 	error = error ? -EFAULT : 0;
diff --git a/arch/ppc64/kernel/syscalls.c b/arch/ppc64/kernel/syscalls.c
index f2865ff8d2f..a8cbb202b8c 100644
--- a/arch/ppc64/kernel/syscalls.c
+++ b/arch/ppc64/kernel/syscalls.c
@@ -199,24 +199,33 @@ out:
 	return ret;
 }
 
-static int __init set_fakeppc(char *str)
+long ppc64_personality(unsigned long personality)
 {
-	if (*str)
-		return 0;
-	init_task.personality = PER_LINUX32;
-	return 1;
+	long ret;
+
+	if (personality(current->personality) == PER_LINUX32
+	    && personality == PER_LINUX)
+		personality = PER_LINUX32;
+	ret = sys_personality(personality);
+	if (ret == PER_LINUX32)
+		ret = PER_LINUX;
+	return ret;
 }
-__setup("fakeppc", set_fakeppc);
 
-asmlinkage int sys_uname(struct old_utsname __user * name)
+long ppc64_newuname(struct new_utsname __user * name)
 {
-	int err = -EFAULT;
-	
+	int err = 0;
+
 	down_read(&uts_sem);
-	if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
-		err = 0;
+	if (copy_to_user(name, &system_utsname, sizeof(*name)))
+		err = -EFAULT;
 	up_read(&uts_sem);
-	
+	if (!err && personality(current->personality) == PER_LINUX32) {
+		/* change ppc64 to ppc */
+		if (__put_user(0, name->machine + 3)
+		    || __put_user(0, name->machine + 4))
+			err = -EFAULT;
+	}
 	return err;
 }