[MIPS] Store sign-extend register values for PTRACE_GETREGS

A comment on ptrace_getregs() states "Registers are sign extended to
fill the available space." but it is not true.  Fix code to match the
comment.  Also fix casts on each caller to get rid of some warnings.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/ptrace.c

@@ -65,13 +65,13 @@ int ptrace_getregs(struct task_struct *child, __s64 __user *data)
 	regs = task_pt_regs(child);
 
 	for (i = 0; i < 32; i++)
-		__put_user(regs->regs[i], data + i);
-	__put_user(regs->lo, data + EF_LO - EF_R0);
-	__put_user(regs->hi, data + EF_HI - EF_R0);
-	__put_user(regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
-	__put_user(regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0);
-	__put_user(regs->cp0_status, data + EF_CP0_STATUS - EF_R0);
-	__put_user(regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0);
+		__put_user((long)regs->regs[i], data + i);
+	__put_user((long)regs->lo, data + EF_LO - EF_R0);
+	__put_user((long)regs->hi, data + EF_HI - EF_R0);
+	__put_user((long)regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
+	__put_user((long)regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0);
+	__put_user((long)regs->cp0_status, data + EF_CP0_STATUS - EF_R0);
+	__put_user((long)regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0);
 
 	return 0;
 }
@@ -390,11 +390,11 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 		}
 
 	case PTRACE_GETREGS:
-		ret = ptrace_getregs(child, (__u64 __user *) data);
+		ret = ptrace_getregs(child, (__s64 __user *) data);
 		break;
 
 	case PTRACE_SETREGS:
-		ret = ptrace_setregs(child, (__u64 __user *) data);
+		ret = ptrace_setregs(child, (__s64 __user *) data);
 		break;
 
 	case PTRACE_GETFPREGS:

arch/mips/kernel/ptrace32.c

@@ -346,11 +346,11 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
 		}
 
 	case PTRACE_GETREGS:
-		ret = ptrace_getregs(child, (__u64 __user *) (__u64) data);
+		ret = ptrace_getregs(child, (__s64 __user *) (__u64) data);
 		break;
 
 	case PTRACE_SETREGS:
-		ret = ptrace_setregs(child, (__u64 __user *) (__u64) data);
+		ret = ptrace_setregs(child, (__s64 __user *) (__u64) data);
 		break;
 
 	case PTRACE_GETFPREGS: