s390: move sys_call_table and last_break from thread_info to thread_struct

Move the last two architecture specific fields from the thread_info
structure to the thread_struct. All that is left in thread_info is
the flags field.
Reviewed-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/elf.h

@@ -193,7 +193,7 @@ extern char elf_platform[];
 do {								\
 	set_personality(PER_LINUX |				\
 		(current->personality & (~PER_MASK)));		\
-	current_thread_info()->sys_call_table = 		\
+	current->thread.sys_call_table =			\
 		(unsigned long) &sys_call_table;		\
 } while (0)
 #else /* CONFIG_COMPAT */
@@ -204,11 +204,11 @@ do {								\
 			(current->personality & ~PER_MASK));	\
 	if ((ex).e_ident[EI_CLASS] == ELFCLASS32) {		\
 		set_thread_flag(TIF_31BIT);			\
-		current_thread_info()->sys_call_table =		\
+		current->thread.sys_call_table =		\
 			(unsigned long)	&sys_call_table_emu;	\
 	} else {						\
 		clear_thread_flag(TIF_31BIT);			\
-		current_thread_info()->sys_call_table =		\
+		current->thread.sys_call_table =		\
 			(unsigned long) &sys_call_table;	\
 	}							\
 } while (0)

arch/s390/include/asm/processor.h

@@ -112,6 +112,7 @@ struct thread_struct {
         unsigned long ksp;              /* kernel stack pointer             */
 	unsigned long user_timer;	/* task cputime in user space */
 	unsigned long system_timer;	/* task cputime in kernel space */
+	unsigned long sys_call_table;	/* system call table address */
 	mm_segment_t mm_segment;
 	unsigned long gmap_addr;	/* address of last gmap fault. */
 	unsigned int gmap_write_flag;	/* gmap fault write indication */
@@ -122,6 +123,7 @@ struct thread_struct {
 	struct per_event per_event;	/* Cause of the last PER trap */
 	unsigned long per_flags;	/* Flags to control debug behavior */
 	unsigned int system_call;	/* system call number in signal */
+	unsigned long last_break;	/* last breaking-event-address. */
         /* pfault_wait is used to block the process on a pfault event */
 	unsigned long pfault_wait;
 	struct list_head list;

arch/s390/include/asm/thread_info.h

@@ -31,8 +31,6 @@
  */
 struct thread_info {
 	unsigned long		flags;		/* low level flags */
-	unsigned long		sys_call_table;	/* System call table address */
-	unsigned long		last_break;	/* last breaking-event-address. */
 };
 
 /*

arch/s390/kernel/asm-offsets.c

@@ -31,6 +31,8 @@ int main(void)
 	BLANK();
 	/* thread struct offsets */
 	OFFSET(__THREAD_ksp, thread_struct, ksp);
+	OFFSET(__THREAD_sysc_table,  thread_struct, sys_call_table);
+	OFFSET(__THREAD_last_break, thread_struct, last_break);
 	OFFSET(__THREAD_FPU_fpc, thread_struct, fpu.fpc);
 	OFFSET(__THREAD_FPU_regs, thread_struct, fpu.regs);
 	OFFSET(__THREAD_per_cause, thread_struct, per_event.cause);
@@ -40,8 +42,6 @@ int main(void)
 	BLANK();
 	/* thread info offsets */
 	OFFSET(__TI_flags, task_struct, thread_info.flags);
-	OFFSET(__TI_sysc_table,  task_struct, thread_info.sys_call_table);
-	OFFSET(__TI_last_break, task_struct, thread_info.last_break);
 	BLANK();
 	/* pt_regs offsets */
 	OFFSET(__PT_ARGS, pt_regs, args);

arch/s390/kernel/compat_signal.c

@@ -446,7 +446,7 @@ static int setup_frame32(struct ksignal *ksig, sigset_t *set,
 		/* set extra registers only for synchronous signals */
 		regs->gprs[4] = regs->int_code & 127;
 		regs->gprs[5] = regs->int_parm_long;
-		regs->gprs[6] = task_thread_info(current)->last_break;
+		regs->gprs[6] = current->thread.last_break;
 	}
 
 	return 0;
@@ -523,7 +523,7 @@ static int setup_rt_frame32(struct ksignal *ksig, sigset_t *set,
 	regs->gprs[2] = ksig->sig;
 	regs->gprs[3] = (__force __u64) &frame->info;
 	regs->gprs[4] = (__force __u64) &frame->uc;
-	regs->gprs[5] = task_thread_info(current)->last_break;
+	regs->gprs[5] = current->thread.last_break;
 	return 0;
 }
 

arch/s390/kernel/entry.S

@@ -124,7 +124,12 @@ _PIF_WORK	= (_PIF_PER_TRAP)
 	.macro	LAST_BREAK scratch
 	srag	\scratch,%r10,23
 	jz	.+10
-	stg	%r10,__TI_last_break(%r12)
+#ifdef CONFIG_HAVE_MARCH_Z990_FEATURES
+	stg	%r10,__TASK_thread+__THREAD_last_break(%r12)
+#else
+	lghi	\scratch,__TASK_thread
+	stg	%r10,__THREAD_last_break(\scratch,%r12)
+#endif
 	.endm
 
 	.macro REENABLE_IRQS
@@ -287,7 +292,13 @@ ENTRY(system_call)
 	mvc	__PT_INT_CODE(4,%r11),__LC_SVC_ILC
 	stg	%r14,__PT_FLAGS(%r11)
 .Lsysc_do_svc:
-	lg	%r10,__TI_sysc_table(%r12)	# address of system call table
+	# load address of system call table
+#ifdef CONFIG_HAVE_MARCH_Z990_FEATURES
+	lg	%r10,__TASK_thread+__THREAD_sysc_table(%r12)
+#else
+	lghi	%r13,__TASK_thread
+	lg	%r10,__THREAD_sysc_table(%r13,%r12)
+#endif
 	llgh	%r8,__PT_INT_CODE+2(%r11)
 	slag	%r8,%r8,2			# shift and test for svc 0
 	jnz	.Lsysc_nr_ok
@@ -388,7 +399,6 @@ ENTRY(system_call)
 	TSTMSK	__PT_FLAGS(%r11),_PIF_SYSCALL
 	jno	.Lsysc_return
 	lmg	%r2,%r7,__PT_R2(%r11)	# load svc arguments
-	lg	%r10,__TI_sysc_table(%r12)	# address of system call table
 	lghi	%r8,0			# svc 0 returns -ENOSYS
 	llgh	%r1,__PT_INT_CODE+2(%r11)	# load new svc number
 	cghi	%r1,NR_syscalls
@@ -1084,7 +1094,7 @@ cleanup_critical:
 	jhe	0f
 	# set up saved registers r10 and r12
 	stg	%r10,16(%r11)		# r10 last break
-	stg	%r12,32(%r11)		# r12 thread-info pointer
+	stg	%r12,32(%r11)		# r12 task struct pointer
 0:	# check if the user time update has been done
 	clg	%r9,BASED(.Lcleanup_system_call_insn+24)
 	jh	0f
@@ -1105,7 +1115,9 @@ cleanup_critical:
 	lg	%r9,16(%r11)
 	srag	%r9,%r9,23
 	jz	0f
-	mvc	__TI_last_break(8,%r12),16(%r11)
+	lgr	%r9,%r12
+	aghi	%r9,__TASK_thread
+	mvc	__THREAD_last_break(8,%r9),16(%r11)
 0:	# set up saved register r11
 	lg	%r15,__LC_KERNEL_STACK
 	la	%r9,STACK_FRAME_OVERHEAD(%r15)

arch/s390/kernel/ptrace.c

@@ -461,7 +461,7 @@ long arch_ptrace(struct task_struct *child, long request,
 		}
 		return 0;
 	case PTRACE_GET_LAST_BREAK:
-		put_user(task_thread_info(child)->last_break,
+		put_user(child->thread.last_break,
 			 (unsigned long __user *) data);
 		return 0;
 	case PTRACE_ENABLE_TE:
@@ -811,7 +811,7 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 		}
 		return 0;
 	case PTRACE_GET_LAST_BREAK:
-		put_user(task_thread_info(child)->last_break,
+		put_user(child->thread.last_break,
 			 (unsigned int __user *) data);
 		return 0;
 	}
@@ -997,10 +997,10 @@ static int s390_last_break_get(struct task_struct *target,
 	if (count > 0) {
 		if (kbuf) {
 			unsigned long *k = kbuf;
-			*k = task_thread_info(target)->last_break;
+			*k = target->thread.last_break;
 		} else {
 			unsigned long  __user *u = ubuf;
-			if (__put_user(task_thread_info(target)->last_break, u))
+			if (__put_user(target->thread.last_break, u))
 				return -EFAULT;
 		}
 	}
@@ -1327,7 +1327,7 @@ static int s390_compat_last_break_get(struct task_struct *target,
 	compat_ulong_t last_break;
 
 	if (count > 0) {
-		last_break = task_thread_info(target)->last_break;
+		last_break = target->thread.last_break;
 		if (kbuf) {
 			unsigned long *k = kbuf;
 			*k = last_break;

arch/s390/kernel/signal.c

@@ -359,7 +359,7 @@ static int setup_frame(int sig, struct k_sigaction *ka,
 		/* set extra registers only for synchronous signals */
 		regs->gprs[4] = regs->int_code & 127;
 		regs->gprs[5] = regs->int_parm_long;
-		regs->gprs[6] = task_thread_info(current)->last_break;
+		regs->gprs[6] = current->thread.last_break;
 	}
 	return 0;
 }
@@ -430,7 +430,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
 	regs->gprs[2] = ksig->sig;
 	regs->gprs[3] = (unsigned long) &frame->info;
 	regs->gprs[4] = (unsigned long) &frame->uc;
-	regs->gprs[5] = task_thread_info(current)->last_break;
+	regs->gprs[5] = current->thread.last_break;
 	return 0;
 }