PPC32: miscellanous small fixes.

Rename print_backtrace to show_stack and improve it, remove the
#if 0 around set_fpexc mode and add get_fpexc_mode, add the
__NR_security define and reserve syscall 225 for Tux.

arch/ppc/kernel/misc.S

@@ -1297,6 +1297,8 @@ _GLOBAL(sys_call_table)
 	.long sys_sched_setaffinity
 	.long sys_sched_getaffinity
 	.long sys_security
+	.long sys_ni_syscall	/* 225 - reserved for Tux */
+
 	.rept NR_syscalls-(.-sys_call_table)/4
 		.long sys_ni_syscall
 	.endr

arch/ppc/kernel/open_pic.c

@@ -149,16 +149,15 @@ struct hw_interrupt_type open_pic_ipi = {
  * data has probably been corrupted and we're going to panic or deadlock later
  * anyway --Troy
  */
-extern unsigned long* _get_SP(void);
 #define check_arg_irq(irq) \
     if (irq < open_pic_irq_offset || irq >= NumSources+open_pic_irq_offset \
 	|| ISR[irq - open_pic_irq_offset] == 0) { \
       printk("open_pic.c:%d: illegal irq %d\n", __LINE__, irq); \
-      print_backtrace(_get_SP()); }
+      show_stack(NULL); }
 #define check_arg_cpu(cpu) \
     if (cpu < 0 || cpu >= NumProcessors){ \
 	printk("open_pic.c:%d: illegal cpu %d\n", __LINE__, cpu); \
-	print_backtrace(_get_SP()); }
+	show_stack(NULL); }
 #else
 #define check_arg_ipi(ipi)	do {} while (0)
 #define check_arg_timer(timer)	do {} while (0)

arch/ppc/kernel/process.c

@@ -44,6 +44,7 @@
 #include <asm/processor.h>
 #include <asm/mmu.h>
 #include <asm/prom.h>
+#include <asm/hardirq.h>
 #ifdef CONFIG_PPC_ISERIES
 #include <asm/iSeries/Paca.h>
 #endif
@@ -293,7 +294,7 @@ void show_regs(struct pt_regs * regs)
 			break;
 	}
 	printk("\n");
-	print_backtrace((unsigned long *)regs->gpr[1]);
+	show_stack((unsigned long *)regs->gpr[1]);
 }
 
 void exit_thread(void)
@@ -418,7 +419,6 @@ void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp)
 #endif /* CONFIG_ALTIVEC */
 }
 
-#if 0
 int set_fpexc_mode(struct task_struct *tsk, unsigned int val)
 {
 	struct pt_regs *regs = tsk->thread.regs;
@@ -431,7 +431,14 @@ int set_fpexc_mode(struct task_struct *tsk, unsigned int val)
 			| tsk->thread.fpexc_mode;
 	return 0;
 }
-#endif
+
+int get_fpexc_mode(struct task_struct *tsk, unsigned long adr)
+{
+	unsigned int val;
+
+	val = __unpack_fe01(tsk->thread.fpexc_mode);
+	return put_user(val, (unsigned int *) adr);
+}
 
 int sys_clone(int p1, int p2, int p3, int p4, int p5, int p6,
 	      struct pt_regs *regs)
@@ -486,20 +493,25 @@ int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
 }
 
 void
-print_backtrace(unsigned long *sp)
+show_stack(unsigned long *sp)
 {
 	int cnt = 0;
 	unsigned long i;
 
+	if (sp == NULL)
+		sp = (unsigned long *)_get_SP();
 	printk("Call backtrace: ");
-	while (sp) {
-		if (__get_user( i, &sp[1] ))
+	for (;;) {
+		if (__get_user(sp, (unsigned long **)sp))
+			break;
+		if (sp == NULL)
+			break;
+		if (__get_user(i, &sp[1]))
 			break;
 		if (cnt++ % 7 == 0)
 			printk("\n");
 		printk("%08lX ", i);
-		if (cnt > 32) break;
-		if (__get_user(sp, (unsigned long **)sp))
+		if (cnt > 32)
 			break;
 	}
 	printk("\n");

include/asm-ppc/processor.h

@@ -196,10 +196,11 @@
 #define	SPRN_DSISR	0x012	/* Data Storage Interrupt Status Register */
 #define	SPRN_EAR	0x11A	/* External Address Register */
 #define	SPRN_ESR	0x3D4	/* Exception Syndrome Register */
-#define	  ESR_IMCP	0x80000000	/* Instr. Machine Check - Protection */
-#define	  ESR_IMCN	0x40000000	/* Instr. Machine Check - Non-config */
-#define	  ESR_IMCB	0x20000000	/* Instr. Machine Check - Bus error */
-#define	  ESR_IMCT	0x10000000	/* Instr. Machine Check - Timeout */
+#define	  ESR_MCI	0x80000000	/* 405 Machine Check - Instruction */
+#define	  ESR_IMCP	0x80000000	/* 403 Inst. Mach. Check - Protection */
+#define	  ESR_IMCN	0x40000000	/* 403 Inst. Mach. Check - Non-config */
+#define	  ESR_IMCB	0x20000000	/* 403 Inst. Mach. Check - Bus error */
+#define	  ESR_IMCT	0x10000000	/* 403 Inst. Mach. Check - Timeout */
 #define	  ESR_PIL	0x08000000	/* Program Exception - Illegal */
 #define	  ESR_PPR	0x04000000	/* Program Exception - Priveleged */
 #define	  ESR_PTR	0x02000000	/* Program Exception - Trap */
@@ -747,9 +748,10 @@ unsigned long get_wchan(struct task_struct *p);
 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 
 /* Get/set floating-point exception mode */
-#define GET_FP_EXC_MODE(tsk)		__unpack_fe01((tsk)->thread.fpexc_mode)
-#define SET_FP_EXC_MODE(tsk, val)	set_fpexc_mode((tsk), (val))
+#define GET_FPEXC_CTL(tsk, adr)	get_fpexc_mode((tsk), (adr))
+#define SET_FPEXC_CTL(tsk, val)	set_fpexc_mode((tsk), (val))
 
+extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 
 static inline unsigned int __unpack_fe01(unsigned int msr_bits)

include/asm-ppc/unistd.h

@@ -231,6 +231,8 @@
 #define __NR_futex		221
 #define __NR_sched_setaffinity	222
 #define __NR_sched_getaffinity	223
+#define __NR_security		224
+#define __NR_tuxcall		225
 
 #define __NR(n)	#n