From 8a4843859f03421855b7393a4f7dd5d1197561cb Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Sat, 2 Jan 2010 22:25:55 +0000
Subject: [PATCH] pprof: workaround for MMSP2 timer glitch, add draw2

git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@852 be3aeb3a-fb24-0410-a615-afba39da0efa
---
 linux/Makefile |  2 +-
 linux/pprof.h  | 19 ++++++++++++++++---
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/linux/Makefile b/linux/Makefile
index 3362a73..627c2e2 100644
--- a/linux/Makefile
+++ b/linux/Makefile
@@ -89,7 +89,7 @@ PicoDrive : $(OBJS)
 	$(CC) $(CFLAGS) $^ $(LDFLAGS) -Wl,-Map=PicoDrive.map -o $@
 
 pprof: pprof.c
-	$(CROSS)gcc -O2 -ggdb -DPPROF -DPPROF_TOOL -I../../ -I. $^ -o $@ -lrt
+	$(CROSS)gcc -O2 -ggdb -DPPROF -DPPROF_TOOL -I../../ -I. $^ -o $@
 
 %.o : %.asm
 	@echo ">>>" $<
diff --git a/linux/pprof.h b/linux/pprof.h
index 88a97e3..cccbcbd 100644
--- a/linux/pprof.h
+++ b/linux/pprof.h
@@ -28,11 +28,14 @@ static __attribute__((always_inline)) inline unsigned int pprof_get_one(void)
   __asm__ __volatile__ ("rdtsc" : "=A" (ret));
   return (unsigned int)ret;
 }
+#define unglitch_timer(x)
 
 #elif defined(__GP2X__)
-// XXX: MMSP2 only
+// XXX: MMSP2 only, timer sometimes seems to return lower vals?
 extern volatile unsigned long *gp2x_memregl;
 #define pprof_get_one() (unsigned int)gp2x_memregl[0x0a00 >> 2]
+#define unglitch_timer(di) \
+  if ((signed int)(di) < 0) di = 0
 
 #else
 #error no timer
@@ -40,12 +43,22 @@ extern volatile unsigned long *gp2x_memregl;
 
 #define pprof_start(point) { \
     unsigned int pp_start_##point = pprof_get_one()
+
 #define pprof_end(point) \
-    pp_counters->counter[pp_##point] += pprof_get_one() - pp_start_##point; \
+    { \
+      unsigned int di = pprof_get_one() - pp_start_##point; \
+      unglitch_timer(di); \
+      pp_counters->counter[pp_##point] += di; \
+    } \
   }
+
 // subtract for recursive stuff
 #define pprof_end_sub(point) \
-    pp_counters->counter[pp_##point] -= pprof_get_one() - pp_start_##point; \
+    { \
+      unsigned int di = pprof_get_one() - pp_start_##point; \
+      unglitch_timer(di); \
+      pp_counters->counter[pp_##point] -= di; \
+    } \
   }
 
 extern void pprof_init(void);
-- 
2.39.2