2 files changed, 326 insertions, 0 deletions
diff --git a/cpukit/libmisc/capture/rtems-trace-buffer-vars.c b/cpukit/libmisc/capture/rtems-trace-buffer-vars.c
new file mode 100644
index 0000000000..ef958c58f7
--- /dev/null
+++ b/cpukit/libmisc/capture/rtems-trace-buffer-vars.c
@@ -0,0 +1,178 @@
+/*
+ *  Copyright (c) 2015 Chris Johns <chrisj@rtems.org>
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+#include <rtems.h>
+
+#include <rtems/trace/rtems-trace-buffer-vars.h>
+
+/**
+ * External Trace Linker and TBG data. We provide weak versions to allow us to
+ * link and be present in an application that has not been trace linked.
+ */
+
+/*
+ * Trace linker data.
+ */
+uint32_t __rtld_trace_names_size __attribute__ ((weak));
+const char const* __rtld_trace_names[1] __attribute__ ((weak));
+uint32_t __rtld_trace_enables_size __attribute__ ((weak));
+const uint32_t __rtld_trace_enables[1] __attribute__ ((weak));
+uint32_t __rtld_trace_triggers_size __attribute__ ((weak));
+const uint32_t __rtld_trace_triggers[1] __attribute__ ((weak));
+const __rtld_trace_sig __rtld_trace_signatures[1] __attribute__ ((weak));
+
+/*
+ * Trace buffer generator data.
+ */
+const bool __rtld_tbg_present __attribute__ ((weak));
+const uint32_t __rtld_tbg_mode __attribute__ ((weak));
+const uint32_t __rtld_tbg_buffer_size __attribute__ ((weak));
+uint32_t __rtld_tbg_buffer[1] __attribute__ ((weak));
+volatile uint32_t __rtld_tbg_buffer_in __attribute__ ((weak));
+volatile bool __rtld_tbg_finished __attribute__ ((weak));
+volatile bool __rtld_tbg_triggered __attribute__ ((weak));
+
+uint32_t
+rtems_trace_names_size (void)
+{
+  return __rtld_trace_names_size;
+}
+
+const char*
+rtems_trace_names (const uint32_t index)
+{
+  return __rtld_trace_names[index];
+}
+
+uint32_t
+rtems_trace_enables_size (void)
+{
+  return __rtld_trace_enables_size;
+}
+
+uint32_t
+rtems_trace_enables (const uint32_t index)
+{
+  return __rtld_trace_enables[index];
+}
+
+uint32_t
+rtems_trace_triggers_size (void)
+{
+  return __rtld_trace_triggers_size;
+}
+
+uint32_t
+rtems_trace_triggers (const uint32_t index)
+{
+  return __rtld_trace_triggers[index];
+}
+
+const rtems_trace_sig*
+rtems_trace_signatures (const uint32_t index)
+{
+  return &__rtld_trace_signatures[index];
+}
+
+bool
+rtems_trace_enable_set(const uint32_t index)
+{
+  return (__rtld_trace_enables[index / 32] & (1 << (index & (32 - 1)))) != 0 ? true : false;
+}
+
+bool
+rtems_trace_trigger_set(const uint32_t index)
+{
+  return (__rtld_trace_triggers[index / 32] & (1 << (index & (32 - 1)))) != 0 ? true : false;
+}
+
+bool
+rtems_trace_buffering_present (void)
+{
+  return __rtld_tbg_present;
+}
+
+uint32_t
+rtems_trace_buffering_mode (void)
+{
+  return __rtld_tbg_mode;
+}
+
+uint32_t
+rtems_trace_buffering_buffer_size (void)
+{
+  return __rtld_tbg_buffer_size;
+}
+
+uint32_t*
+rtems_trace_buffering_buffer (void)
+{
+  return &__rtld_tbg_buffer[0];
+}
+
+uint32_t
+rtems_trace_buffering_buffer_in (void)
+{
+  rtems_interrupt_lock_context lcontext;
+  uint32_t                     in;
+  rtems_interrupt_lock_acquire(&__rtld_tbg_lock, &lcontext);
+  in = __rtld_tbg_buffer_in;
+  rtems_interrupt_lock_release(&__rtld_tbg_lock, &lcontext);
+  return in;
+}
+
+bool
+rtems_trace_buffering_finished (void)
+{
+  rtems_interrupt_lock_context lcontext;
+  bool                         finished;
+  rtems_interrupt_lock_acquire(&__rtld_tbg_lock, &lcontext);
+  finished = __rtld_tbg_finished;
+  rtems_interrupt_lock_release(&__rtld_tbg_lock, &lcontext);
+  return finished;
+}
+
+bool
+rtems_trace_buffering_triggered (void)
+{
+  rtems_interrupt_lock_context lcontext;
+  bool                         triggered;
+  rtems_interrupt_lock_acquire(&__rtld_tbg_lock, &lcontext);
+  triggered = __rtld_tbg_triggered;
+  rtems_interrupt_lock_release(&__rtld_tbg_lock, &lcontext);
+  return triggered;
+}
+
+void
+rtems_trace_buffering_start (void)
+{
+  rtems_interrupt_lock_context lcontext;
+  rtems_interrupt_lock_acquire(&__rtld_tbg_lock, &lcontext);
+  __rtld_tbg_triggered = false;
+  __rtld_tbg_buffer_in = 0;
+  __rtld_tbg_finished = false;
+  rtems_interrupt_lock_release(&__rtld_tbg_lock, &lcontext);
+}
+
+void
+rtems_trace_buffering_stop (void)
+{
+  rtems_interrupt_lock_context lcontext;
+  rtems_interrupt_lock_acquire(&__rtld_tbg_lock, &lcontext);
+  __rtld_tbg_finished = true;
+  rtems_interrupt_lock_release(&__rtld_tbg_lock, &lcontext);
+}
+
+void
+rtems_trace_buffering_resume (void)
+{
+  rtems_interrupt_lock_context lcontext;
+  rtems_interrupt_lock_acquire(&__rtld_tbg_lock, &lcontext);
+  __rtld_tbg_finished = false;
+  rtems_interrupt_lock_release(&__rtld_tbg_lock, &lcontext);
+}
diff --git a/cpukit/libmisc/capture/rtems-trace-buffer-vars.h b/cpukit/libmisc/capture/rtems-trace-buffer-vars.h
new file mode 100644
index 0000000000..8f0ff08587
--- /dev/null
+++ b/cpukit/libmisc/capture/rtems-trace-buffer-vars.h
@@ -0,0 +1,148 @@
+/**
+ * @file
+ *
+ * @ingroup Shell
+ *
+ * @brief Access to the RTEMS Trace Buffer Generator (TBG).
+ */
+/*
+ *  Copyright (c) 2015 Chris Johns <chrisj@rtems.org>
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+#if !defined (_RTEMS_TRACE_BUFFER_VARS_H_)
+#define _RTEMS_TRACE_BUFFER_VARS_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/**
+ * These functions are provided as a separated interface to the Trace Buffer
+ * Generatror (TBG) data are not really designed for any real-time performance
+ * type interface.
+ *
+ * Separating the data from the codes stops the compiler incorrectly loop
+ * optimising.
+ */
+
+typedef struct
+{
+  uint32_t          size;
+  const char* const type;
+} __rtld_trace_sig_arg;
+
+  typedef struct {
+    uint32_t                    argc;
+    const __rtld_trace_sig_arg* args;
+} __rtld_trace_sig;
+
+typedef __rtld_trace_sig_arg rtems_trace_sig_arg;
+typedef __rtld_trace_sig rtems_trace_sig;
+
+/**
+ * Returns the number of trace functions.
+ */
+uint32_t  rtems_trace_names_size (void);
+
+/**
+ * Return the name given an index. No range checking.
+ */
+const char* rtems_trace_names (const uint32_t index);
+
+/**
+ * Returns the number of words in the enables array.
+ */
+uint32_t rtems_trace_enables_size (void);
+
+/**
+ * Return the enable 32bit bitmap indexed into the enables array. No range
+ * checking.
+ */
+uint32_t rtems_trace_enables (const uint32_t index);
+
+/**
+ * Returns the number of words in the triggers array.
+ */
+uint32_t rtems_trace_triggers_size (void);
+
+/**
+ * Return the trigger 32bit bitmap indexed into the triggers array. No range
+ * checking.
+ */
+uint32_t rtems_trace_triggers (const uint32_t index);
+
+/**
+ * Return the trace function signature.
+ */
+const rtems_trace_sig* rtems_trace_signatures (const uint32_t index);
+
+/**
+ * Return true is the enable bit is set for the trace function index.
+ */
+bool rtems_trace_enable_set(const uint32_t index);
+
+/**
+ * Return true is the trigger bit is set for the trace function index.
+ */
+bool rtems_trace_trigger_set(const uint32_t index);
+
+/**
+ * The application has been linked with Trace Buffering generated code.
+ */
+bool rtems_trace_buffering_present (void);
+
+/**
+ * Return the trace buffering mode flags.
+ */
+uint32_t rtems_trace_buffering_mode (void);
+
+/**
+ * Return the size of the trace buffering buffer in words.
+ */
+uint32_t rtems_trace_buffering_buffer_size (void);
+
+/**
+ * Return the base of the trace buffering buffer.
+ */
+uint32_t* rtems_trace_buffering_buffer (void);
+
+/**
+ * Return the buffer level. This is only stable if tracing has finished.
+ */
+uint32_t rtems_trace_buffering_buffer_in (void);
+
+/**
+ * The tracing has finished.
+ */
+bool rtems_trace_buffering_finished (void);
+
+/**
+ * Trace has been triggered and enable trace functions are being recorded.
+ */
+bool rtems_trace_buffering_triggered (void);
+
+/**
+ * Start tracing by clearing the triggered flag, setting to 0 and clearing the
+ * finished flag.
+ */
+void rtems_trace_buffering_start (void);
+
+/**
+ * Stop tracing by setting the finished flag.
+ */
+void rtems_trace_buffering_stop (void);
+
+/**
+ * Resume tracing by setting the finished flag.
+ */
+void rtems_trace_buffering_resume (void);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif