From 78b4e79c4f51a4cb9244ba1d59840ef8a76518cb Mon Sep 17 00:00:00 2001
Date: Tue, 20 Jun 2023 15:15:04 +0800
Subject: [PATCH] papi add support riscv64

---
 src/libpfm4/config.mk |  3 +++
 src/linux-context.h   |  2 ++
 src/linux-timer.c     | 20 ++++++++++++++++++++
 src/mb.h              |  3 +++
 4 files changed, 28 insertions(+)

diff --git a/src/libpfm4/config.mk b/src/libpfm4/config.mk
index 2b26947..c12fa45 100644
--- a/src/libpfm4/config.mk
+++ b/src/libpfm4/config.mk
@@ -177,6 +177,9 @@ ifeq ($(ARCH),cell)
 CONFIG_PFMLIB_CELL=y
 endif
 
+ifeq ($(ARCH),riscv64)
+CONFIG_PFMLIB_ARCH_RISCV64=y
+endif
 
 #
 # you shouldn't have to touch anything beyond this point
diff --git a/src/linux-context.h b/src/linux-context.h
index f46e557..394a480 100644
--- a/src/linux-context.h
+++ b/src/linux-context.h
@@ -39,6 +39,8 @@ typedef ucontext_t hwd_ucontext_t;
 #define OVERFLOW_ADDRESS(ctx) ctx.ucontext->uc_mcontext.pc
 #elif defined(__hppa__)
 #define OVERFLOW_ADDRESS(ctx) ctx.ucontext->uc_mcontext.sc_iaoq[0]
+#elif defined(__riscv)
+#define OVERFLOW_ADDRESS(ctx) ctx.ucontext->uc_mcontext.__gregs[REG_PC]
 #else
 #error "OVERFLOW_ADDRESS() undefined!"
 #endif
diff --git a/src/linux-timer.c b/src/linux-timer.c
index 0eaa79c..46bfe75 100644
--- a/src/linux-timer.c
+++ b/src/linux-timer.c
@@ -300,7 +300,27 @@ get_cycles( void )
 	return ret;
 }
 
+/************************/
+/* riscv64 get_cycles() */
+/************************/
+
+#elif defined(__riscv) && defined(__riscv_xlen) && __riscv_xlen == 64
+static inline long long
+get_cycles( void ) 
+{ 
+	register unsigned long ret;
 
+	__asm__ __volatile__ ("rdtime %0" : "=r" (ret));
+
+	return ret;
+} 
+
+/*
+ * TODO: riscv32 implementation can be done following example in: 
+ * Volume I: RISC-V User-Level ISA V2.2
+ *   2.8 Control and Status Register Instructions
+ *     Timers and Counters
+ */
 
 #elif !defined(HAVE_GETTIMEOFDAY) && !defined(HAVE_CLOCK_GETTIME)
 #error "No get_cycles support for this architecture. "
diff --git a/src/mb.h b/src/mb.h
index 81797c5..347436b 100644
--- a/src/mb.h
+++ b/src/mb.h
@@ -39,6 +39,9 @@
 #elif defined(__aarch64__)
 #define rmb()           asm volatile("dmb ld" ::: "memory")
 
+#elif defined(__riscv)
+#define rmb()           asm volatile("fence ir, ir" ::: "memory")
+
 #elif defined(__mips__)
 #define rmb()           asm volatile(                                   \
                                 ".set   mips2\n\t"                      \
-- 
2.33.0