sandbox: Support trace feature

Support tracing on sandbox by adding suitable CONFIG options. To enable it,
compile U-Boot with FTRACE=1.

The timer functions are marked to skip tracing, since these are called from
the tracing code itself, and we want to avoid an infinite loop.

Signed-off-by: Simon Glass <sjg@chromium.org>

2 files changed, 2 insertions, 2 deletions

diff --git a/arch/sandbox/cpu/cpu.c b/arch/sandbox/cpu/cpu.c
index dd8d495..e9385de 100644
--- a/arch/sandbox/cpu/cpu.c
+++ b/arch/sandbox/cpu/cpu.c
@@ -37,7 +37,7 @@ void __udelay(unsigned long usec)
 	os_usleep(usec);
 }
 
-unsigned long timer_get_us(void)
+unsigned long __attribute__((no_instrument_function)) timer_get_us(void)
 {
 	return os_get_nsec() / 1000;
 }
diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c
index d075407..541e450 100644
--- a/arch/sandbox/cpu/os.c
+++ b/arch/sandbox/cpu/os.c
@@ -152,7 +152,7 @@ void os_usleep(unsigned long usec)
 	usleep(usec);
 }
 
-u64 os_get_nsec(void)
+u64 __attribute__((no_instrument_function)) os_get_nsec(void)
 {
 #if defined(CLOCK_MONOTONIC) && defined(_POSIX_MONOTONIC_CLOCK)
 	struct timespec tp;