[PATCH] introduce profile_pc()

The program counter calculation from pt_regs is the only portion of profile
accounting that differs across various architectures.  This is usually
instruction_pointer(regs), but to handle the few arches where it isn't,
introduce profile_pc().
Signed-off-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ia64/kernel/time.c

@@ -195,7 +195,7 @@ EXPORT_SYMBOL(do_gettimeofday);
 static inline void
 ia64_do_profile (struct pt_regs * regs)
 {
-	unsigned long ip, slot;
+	unsigned long ip;
 
 	profile_hook(regs);
 
@@ -205,12 +205,10 @@ ia64_do_profile (struct pt_regs * regs)
 	if (!prof_buffer)
 		return;
 
-	ip = instruction_pointer(regs);
 	/* Conserve space in histogram by encoding slot bits in address
 	 * bits 2 and 3 rather than bits 0 and 1.
 	 */
-	slot = ip & 3;
-	ip = (ip & ~3UL) + 4*slot;
+	ip = profile_pc(regs);
 
 	/*
 	 * Only measure the CPUs specified by /proc/irq/prof_cpu_mask.

arch/sh/kernel/time.c

@@ -262,9 +262,6 @@ static inline void sh_do_profile(unsigned long pc)
 	if (!prof_buffer || !current->pid)
 		return;
 
-	if (pc >= 0xa0000000UL && pc < 0xc0000000UL)
-		pc -= 0x20000000;
-
 	pc -= (unsigned long)&_stext;
 	pc >>= prof_shift;
 
@@ -288,7 +285,7 @@ static inline void do_timer_interrupt(int irq, void *dev_id, struct pt_regs *reg
 	do_timer(regs);
 
 	if (!user_mode(regs))
-		sh_do_profile(regs->pc);
+		sh_do_profile(profile_pc(regs));
 
 #ifdef CONFIG_HEARTBEAT
 	if (sh_mv.mv_heartbeat != NULL) 

arch/sparc/kernel/sun4d_smp.c

@@ -19,6 +19,7 @@
 #include <linux/spinlock.h>
 #include <linux/mm.h>
 #include <linux/swap.h>
+#include <linux/profile.h>
 
 #include <asm/ptrace.h>
 #include <asm/atomic.h>

arch/sparc/kernel/sun4m_smp.c

@@ -16,6 +16,7 @@
 #include <linux/spinlock.h>
 #include <linux/mm.h>
 #include <linux/swap.h>
+#include <linux/profile.h>
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 

arch/sparc/kernel/time.c

@@ -79,17 +79,13 @@ struct intersil *intersil_clock;
 
 #endif
 
-static spinlock_t ticker_lock = SPIN_LOCK_UNLOCKED;
-
-/* 32-bit Sparc specific profiling function. */
-void sparc_do_profile(unsigned long pc, unsigned long o7)
+unsigned long profile_pc(struct pt_regs *regs)
 {
-	if(prof_buffer && current->pid) {
-		extern int _stext;
 	extern int __copy_user_begin, __copy_user_end;
 	extern int __atomic_begin, __atomic_end;
 	extern int __bzero_begin, __bzero_end;
 	extern int __bitops_begin, __bitops_end;
+	unsigned long pc = regs->pc;
 
 	if ((pc >= (unsigned long) &__copy_user_begin &&
 	     pc < (unsigned long) &__copy_user_end) ||
@@ -99,7 +95,17 @@ void sparc_do_profile(unsigned long pc, unsigned long o7)
 	     pc < (unsigned long) &__bzero_end) ||
 	    (pc >= (unsigned long) &__bitops_begin &&
 	     pc < (unsigned long) &__bitops_end))
-			pc = o7;
+		pc = regs->u_regs[UREG_RETPC];
+	return pc;
+}
+
+static spinlock_t ticker_lock = SPIN_LOCK_UNLOCKED;
+
+/* 32-bit Sparc specific profiling function. */
+void sparc_do_profile(unsigned long pc, unsigned long o7)
+{
+	if(prof_buffer && current->pid) {
+		extern int _stext;
 
 		pc -= (unsigned long) &_stext;
 		pc >>= prof_shift;
@@ -130,7 +136,7 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)
 
 #ifndef CONFIG_SMP
 	if(!user_mode(regs))
-		sparc_do_profile(regs->pc, regs->u_regs[UREG_RETPC]);
+		sparc_do_profile(profile_pc(regs));
 #endif
 
 	/* Protect counter clear so that do_gettimeoffset works */

arch/sparc64/kernel/smp.c

@@ -19,6 +19,7 @@
 #include <linux/seq_file.h>
 #include <linux/cache.h>
 #include <linux/jiffies.h>
+#include <linux/profile.h>
 
 #include <asm/head.h>
 #include <asm/ptrace.h>

arch/sparc64/kernel/time.c

@@ -29,6 +29,7 @@
 #include <linux/jiffies.h>
 #include <linux/cpufreq.h>
 #include <linux/percpu.h>
+#include <linux/profile.h>
 
 #include <asm/oplib.h>
 #include <asm/mostek.h>
@@ -453,14 +454,8 @@ void sparc64_do_profile(struct pt_regs *regs)
 	if (!prof_buffer)
 		return;
 
-	pc = regs->tpc;
-
-	pc -= (unsigned long) _stext;
-	pc >>= prof_shift;
-
-	if(pc >= prof_len)
-		pc = prof_len - 1;
-	atomic_inc((atomic_t *)&prof_buffer[pc]);
+	pc = (profile_pc(regs) - (unsigned long)_stext) >> prof_shift;
+	atomic_inc((atomic_t *)&prof_buffer[min(pc, prof_len-1)]);
 }
 
 static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)

include/asm-alpha/ptrace.h

@@ -69,6 +69,7 @@ struct switch_stack {
 #ifdef __KERNEL__
 #define user_mode(regs) (((regs)->ps & 8) != 0)
 #define instruction_pointer(regs) ((regs)->pc)
+#define profile_pc(regs) instruction_pointer(regs)
 extern void show_regs(struct pt_regs *);
 
 #define alpha_task_regs(task) \

include/asm-arm/ptrace.h

@@ -130,6 +130,7 @@ static inline int valid_user_regs(struct pt_regs *regs)
 
 #define instruction_pointer(regs) \
 	(pc_pointer((regs)->ARM_pc))
+#define profile_pc(regs) instruction_pointer(regs)
 
 #ifdef __KERNEL__
 extern void show_regs(struct pt_regs *);

include/asm-arm26/ptrace.h

@@ -30,6 +30,7 @@
 
 #define pc_pointer(v) ((v) & ~PCMASK)   /* convert v to pc type address */
 #define instruction_pointer(regs) (pc_pointer((regs)->ARM_pc)) /* get pc */
+#define profile_pc(regs) instruction_pointer(regs)
 
 /* this struct defines the way the registers are stored on the
    stack during a system call. */

include/asm-cris/arch-v10/ptrace.h

@@ -109,6 +109,7 @@ struct switch_stack {
 /* bit 8 is user-mode flag */
 #define user_mode(regs) (((regs)->dccr & 0x100) != 0)
 #define instruction_pointer(regs) ((regs)->irp)
+#define profile_pc(regs) instruction_pointer(regs)
 extern void show_regs(struct pt_regs *);
 
 #endif

include/asm-h8300/ptrace.h

@@ -57,6 +57,7 @@ struct pt_regs {
 
 #define user_mode(regs) (!((regs)->ccr & PS_S))
 #define instruction_pointer(regs) ((regs)->pc)
+#define profile_pc(regs) instruction_pointer(regs)
 extern void show_regs(struct pt_regs *);
 #endif /* __KERNEL__ */
 #endif /* __ASSEMBLY__ */

include/asm-i386/ptrace.h

@@ -57,6 +57,7 @@ struct pt_regs {
 #ifdef __KERNEL__
 #define user_mode(regs) ((VM_MASK & (regs)->eflags) || (3 & (regs)->xcs))
 #define instruction_pointer(regs) ((regs)->eip)
+#define profile_pc(regs) instruction_pointer(regs)
 #endif
 
 #endif

include/asm-ia64/ptrace.h

@@ -229,6 +229,15 @@ struct switch_stack {
  * the canonical representation by adding to instruction pointer.
  */
 # define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)
+/* Conserve space in histogram by encoding slot bits in address
+ * bits 2 and 3 rather than bits 0 and 1.
+ */
+#define profile_pc(regs)						\
+({									\
+	unsigned long __ip = instruction_pointer(regs);			\
+	(__ip & ~3UL) + ((__ip & 3UL) << 2);				\
+})
+
   /* given a pointer to a task_struct, return the user's pt_regs */
 # define ia64_task_regs(t)		(((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)
 # define ia64_psr(regs)			((struct ia64_psr *) &(regs)->cr_ipsr)

include/asm-m68k/ptrace.h

@@ -73,6 +73,7 @@ struct switch_stack {
 
 #define user_mode(regs) (!((regs)->sr & PS_S))
 #define instruction_pointer(regs) ((regs)->pc)
+#define profile_pc(regs) instruction_pointer(regs)
 extern void show_regs(struct pt_regs *);
 #endif /* __KERNEL__ */
 #endif /* __ASSEMBLY__ */

include/asm-m68knommu/ptrace.h

@@ -84,6 +84,7 @@ struct switch_stack {
 
 #define user_mode(regs) (!((regs)->sr & PS_S))
 #define instruction_pointer(regs) ((regs)->pc)
+#define profile_pc(regs) instruction_pointer(regs)
 extern void show_regs(struct pt_regs *);
 #endif /* __KERNEL__ */
 #endif /* __ASSEMBLY__ */

include/asm-mips/ptrace.h

@@ -66,6 +66,7 @@ struct pt_regs {
 #define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
 
 #define instruction_pointer(regs) ((regs)->cp0_epc)
+#define profile_pc(regs) instruction_pointer(regs)
 
 extern void show_regs(struct pt_regs *);
 

include/asm-parisc/ptrace.h

@@ -48,6 +48,7 @@ struct pt_regs {
 /* XXX should we use iaoq[1] or iaoq[0] ? */
 #define user_mode(regs)			(((regs)->iaoq[0] &  3) ? 1 : 0)
 #define instruction_pointer(regs)	((regs)->iaoq[0] & ~3)
+#define profile_pc(regs) instruction_pointer(regs)
 extern void show_regs(struct pt_regs *);
 #endif
 

include/asm-ppc/ptrace.h

@@ -47,6 +47,7 @@ struct pt_regs {
 
 #ifndef __ASSEMBLY__
 #define instruction_pointer(regs) ((regs)->nip)
+#define profile_pc(regs) instruction_pointer(regs)
 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
 
 #define force_successful_syscall_return()   \

include/asm-ppc64/ptrace.h

@@ -69,6 +69,7 @@ struct pt_regs32 {
 #define __SIGNAL_FRAMESIZE32	64
 
 #define instruction_pointer(regs) ((regs)->nip)
+#define profile_pc(regs) instruction_pointer(regs)
 #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
 
 #define force_successful_syscall_return()   \

include/asm-s390/ptrace.h

@@ -466,6 +466,7 @@ struct user_regs_struct
 #ifdef __KERNEL__
 #define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
 #define instruction_pointer(regs) ((regs)->psw.addr & PSW_ADDR_INSN)
+#define profile_pc(regs) instruction_pointer(regs)
 extern void show_regs(struct pt_regs * regs);
 #endif
 

include/asm-sh/ptrace.h

@@ -90,6 +90,15 @@ struct pt_dspregs {
 #define user_mode(regs) (((regs)->sr & 0x40000000)==0)
 #define instruction_pointer(regs) ((regs)->pc)
 extern void show_regs(struct pt_regs *);
+
+static inline unsigned long profile_pc(struct pt_regs *regs)
+{
+	unsigned long pc = instruction_pointer(regs);
+
+	if (pc >= 0xa0000000UL && pc < 0xc0000000UL)
+		pc -= 0x20000000;
+	return pc;
+}
 #endif
 
 #endif /* __ASM_SH_PTRACE_H */

include/asm-sh64/ptrace.h

@@ -28,6 +28,7 @@ struct pt_regs {
 #ifdef __KERNEL__
 #define user_mode(regs) (((regs)->sr & 0x40000000)==0)
 #define instruction_pointer(regs) ((regs)->pc)
+#define profile_pc(regs) instruction_pointer(regs)
 extern void show_regs(struct pt_regs *);
 #endif
 

include/asm-sparc/ptrace.h

@@ -62,6 +62,7 @@ struct sparc_stackf {
 #ifdef __KERNEL__
 #define user_mode(regs) (!((regs)->psr & PSR_PS))
 #define instruction_pointer(regs) ((regs)->pc)
+unsigned long profile_pc(struct pt_regs *);
 extern void show_regs(struct pt_regs *);
 #endif
 

include/asm-sparc64/ptrace.h

@@ -98,6 +98,7 @@ struct sparc_trapf {
 	set_thread_flag(TIF_SYSCALL_SUCCESS)
 #define user_mode(regs) (!((regs)->tstate & TSTATE_PRIV))
 #define instruction_pointer(regs) ((regs)->tpc)
+#define profile_pc(regs) instruction_pointer(regs)
 extern void show_regs(struct pt_regs *);
 #endif
 

include/asm-v850/ptrace.h

@@ -76,6 +76,7 @@ struct pt_regs
 
 
 #define instruction_pointer(regs)	((regs)->pc)
+#define profile_pc(regs) instruction_pointer(regs)
 #define user_mode(regs)			(!(regs)->kernel_mode)
 
 /* When a struct pt_regs is used to save user state for a system call in

include/asm-x86_64/ptrace.h

@@ -83,6 +83,7 @@ struct pt_regs {
 #if defined(__KERNEL__) && !defined(__ASSEMBLY__) 
 #define user_mode(regs) (!!((regs)->cs & 3))
 #define instruction_pointer(regs) ((regs)->rip)
+#define profile_pc(regs) instruction_pointer(regs)
 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
 
 enum {