sparc64: Fix perf_arch_get_caller_regs().

After b0f82b81fe ("perf: Drop the skip
argument from perf_arch_fetch_regs_caller") the build broke on sparc64
due to the lack of a module symbol export of __perf_arch_fetch_caller_regs.

But that assembler helper can actually be complete eliminated now that
the semantics of this interface have been greatly simplified.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/include/asm/perf_event.h

@@ -10,11 +10,26 @@ extern void set_perf_event_pending(void);
 
 extern void init_hw_perf_events(void);
 
-extern void
-__perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip);
-
-#define perf_arch_fetch_caller_regs(pt_regs, ip)	\
-	__perf_arch_fetch_caller_regs(pt_regs, ip, 1);
+#define perf_arch_fetch_caller_regs(regs, ip)		\
+do {							\
+	unsigned long _pstate, _asi, _pil, _i7, _fp;	\
+	__asm__ __volatile__("rdpr %%pstate, %0\n\t"	\
+			     "rd %%asi, %1\n\t"		\
+			     "rdpr %%pil, %2\n\t"	\
+			     "mov %%i7, %3\n\t"		\
+			     "mov %%i6, %4\n\t"		\
+			     : "=r" (_pstate),		\
+			       "=r" (_asi),		\
+			       "=r" (_pil),		\
+			       "=r" (_i7),		\
+			       "=r" (_fp));		\
+	(regs)->tstate = (_pstate << 8) |		\
+		(_asi << 24) | (_pil << 20);		\
+	(regs)->tpc = (ip);				\
+	(regs)->tnpc = (regs)->tpc + 4;			\
+	(regs)->u_regs[UREG_I6] = _fp;			\
+	(regs)->u_regs[UREG_I7] = _i7;			\
+} while (0)
 #else
 static inline void init_hw_perf_events(void)	{ }
 #endif