Hello,
this is my first attempt to provide support for aarch64 (ARMv8a). At the moment
the only arm patch available is for ARMv7.
Is anybody else working on this issue at the moment?
NOTE: my patch apply and linuxsampler compiles fine for aarch64, but when the
add ENGINE
command is sent the server (linuxsampler) crashes with [error
1]+ Illegal instruction
I don't know how to proper debug the issue (printf before atomic instructions?)
so I'm asking some support to finish the job.
Thanks
From 886891b69aa3690b3e6a2f83462949480611bb12 Mon Sep 17 00:00:00 2001
From: Massimo Pennazio <maxipe...@libero.it>
Date: Thu, 11 Oct 2018 10:45:26 +0200
Subject: [PATCH] Added aarch64 support
---
src/common/RTMath.cpp | 7 +++
src/common/atomic.h | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 128 insertions(+)
diff --git a/src/common/RTMath.cpp b/src/common/RTMath.cpp
index f228c08..788bab5 100644
--- a/src/common/RTMath.cpp
+++ b/src/common/RTMath.cpp
@@ -22,6 +22,9 @@
***************************************************************************/
#include "RTMath.h"
+#if defined(__aarch64__)
+#include <time.h>
+#endif
// for unsafeMicroSeconds() implementation
#if !defined(WIN32) && !defined(__APPLE__)
@@ -73,6 +76,10 @@ RTMathBase::time_stamp_t RTMathBase::CreateTimeStamp() {
return t;
#elif defined(__APPLE__)
return (time_stamp_t) mach_absolute_time();
+ #elif defined(__aarch64__)
+ timespec tp;
+ clock_gettime(CLOCK_MONOTONIC, &tp);
+ return tp.tv_nsec;
#else // we don't want to use a slow generic solution
# error "Sorry, LinuxSampler lacks time stamp code for your system."
# error "Please report this error and the CPU you are using to the LinuxSampler developers mailing list!"
diff --git a/src/common/atomic.h b/src/common/atomic.h
index b1f5c43..98c875e 100644
--- a/src/common/atomic.h
+++ b/src/common/atomic.h
@@ -1186,6 +1186,126 @@ static __inline__ int atomic_dec_and_test(volatile atomic_t *v)
#endif /* __ARCH_M68K_ATOMIC __ */
#else
+#ifdef __aarch64__
+
+/*
+ * That part of code for ARM11 was taken from ALSA's iatomic.h
+ */
+
+/*
+ * FIXME: bellow code is valid only for SA11xx
+ */
+
+/*
+ * Save the current interrupt enable state & disable IRQs
+ */
+#define local_irq_save(x)\
+ ({\
+ unsigned long temp;\
+ __asm__ __volatile__(\
+ "mrs %0, daif // local_irq_save\n"\
+ "msr daifset, #2"\
+ : "=r" (x), "=r" (temp)\
+ :\
+ : "memory");\
+ })
+
+/*
+ * restore saved IRQ & FIQ state
+ */
+#define local_irq_restore(x)\
+ __asm__ __volatile__(\
+ "msr daif, %0 // local_irq_restore\n"\
+ :\
+ : "r" (x)\
+ : "memory")
+
+#define __save_flags_cli(x) local_irq_save(x)
+#define __restore_flags(x) local_irq_restore(x)
+
+typedef struct { volatile int counter; } atomic_t;
+
+#define ATOMIC_INIT(i) { (i) }
+
+#define atomic_read(v) ((v)->counter)
+#define atomic_set(v,i) (((v)->counter) = (i))
+
+static __inline__ void atomic_add(int i, volatile atomic_t *v)
+{
+ unsigned long flags;
+
+ __save_flags_cli(flags);
+ v->counter += i;
+ __restore_flags(flags);
+}
+
+static __inline__ void atomic_sub(int i, volatile atomic_t *v)
+{
+ unsigned long flags;
+
+ __save_flags_cli(flags);
+ v->counter -= i;
+ __restore_flags(flags);
+}
+
+static __inline__ void atomic_inc(volatile atomic_t *v)
+{
+ unsigned long flags;
+
+ __save_flags_cli(flags);
+ v->counter += 1;
+ __restore_flags(flags);
+}
+
+static __inline__ void atomic_dec(volatile atomic_t *v)
+{
+ unsigned long flags;
+
+ __save_flags_cli(flags);
+ v->counter -= 1;
+ __restore_flags(flags);
+}
+
+static __inline__ int atomic_dec_and_test(volatile atomic_t *v)
+{
+ unsigned long flags;
+ int result;
+
+ __save_flags_cli(flags);
+ v->counter -= 1;
+ result = (v->counter == 0);
+ __restore_flags(flags);
+
+ return result;
+}
+
+static inline int atomic_add_negative(int i, volatile atomic_t *v)
+{
+ unsigned long flags;
+ int result;
+
+ __save_flags_cli(flags);
+ v->counter += i;
+ result = (v->counter < 0);
+ __restore_flags(flags);
+
+ return result;
+}
+
+static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *addr)
+{
+ unsigned long flags;
+
+ __save_flags_cli(flags);
+ *addr &= ~mask;
+ __restore_flags(flags);
+}
+
+#define mb() __asm__ __volatile__ ("" : : : "memory")
+#define rmb() mb()
+#define wmb() mb()
+
+#else
#warning libs/pbd has no implementation of strictly atomic operations for your hardware.
@@ -1231,6 +1351,7 @@ static __inline__ int atomic_inc_and_test(atomic_t *v)
}
# endif /* __NO_STRICT_ATOMIC */
+# endif /* aarch64 */
# endif /* m68k */
# endif /* mips */
# endif /* s390 */
--
2.13.7
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