SPARC: add support for the tracing subsystem

This commit implements the architecture specific parts for the
Zephyr tracing subsystem on SPARC and LEON3. It does so by calling
sys_trace_isr_enter(), sys_trace_isr_exit() and sys_trace_idle().

The logic for the ISR tracing is:
1. switch to interrupt stack
2. *call sys_trace_isr_enter()* if CONFIG_TRACING_ISR
3. call the interrupt handler
4. *call sys_trace_isr_exit()* if CONFIG_TRACING_ISR
5. switch back to thread stack

Signed-off-by: Martin Åberg <[email protected]>

Author: tbr-tt

arch/sparc/core/interrupt_trap.S

@@ -127,10 +127,20 @@ __sparc_trap_interrupt:
 	nop
 	nop
 
-	/* SPARC interrupt request level is the first agrument */
+#ifdef CONFIG_TRACING_ISR
+	call	sys_trace_isr_enter
+	 nop
+#endif
+
+	/* SPARC interrupt request level is the first argument */
 	call	z_sparc_enter_irq
 	 mov	%l3, %o0
 
+#ifdef CONFIG_TRACING_ISR
+	call	sys_trace_isr_exit
+	 nop
+#endif
+
 	/*
 	 * Switch back to interrupted task stack
 	 * %fp: %sp of interrupted task - ISF_SIZE.

soc/sparc/leon3/idle.c

@@ -5,9 +5,11 @@
  */
 
 #include <kernel.h>
+#include <tracing/tracing.h>
 
 static void leon_idle(unsigned int key)
 {
+	sys_trace_idle();
 	irq_unlock(key);
 
 	__asm__ volatile ("wr  %g0, %asr19");