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Diffstat (limited to 'lib/trace.c')
-rw-r--r--lib/trace.c93
1 files changed, 63 insertions, 30 deletions
diff --git a/lib/trace.c b/lib/trace.c
index b9dc6d2e4b..1091a5793a 100644
--- a/lib/trace.c
+++ b/lib/trace.c
@@ -35,9 +35,11 @@ struct trace_hdr {
ulong ftrace_count; /* Num. of ftrace records written */
ulong ftrace_too_deep_count; /* Functions that were too deep */
- int depth;
- int depth_limit;
- int max_depth;
+ int depth; /* Depth of function calls */
+ int depth_limit; /* Depth limit to trace to */
+ int max_depth; /* Maximum depth seen so far */
+ int min_depth; /* Minimum depth seen so far */
+ bool trace_locked; /* Used to detect recursive tracing */
};
/* Pointer to start of trace buffer */
@@ -118,18 +120,6 @@ static void notrace add_ftrace(void *func_ptr, void *caller, ulong flags)
hdr->ftrace_count++;
}
-static void notrace add_textbase(void)
-{
- if (hdr->ftrace_count < hdr->ftrace_size) {
- struct trace_call *rec = &hdr->ftrace[hdr->ftrace_count];
-
- rec->func = CONFIG_TEXT_BASE;
- rec->caller = 0;
- rec->flags = FUNCF_TEXTBASE;
- }
- hdr->ftrace_count++;
-}
-
/**
* __cyg_profile_func_enter() - record function entry
*
@@ -144,6 +134,14 @@ void notrace __cyg_profile_func_enter(void *func_ptr, void *caller)
if (trace_enabled) {
int func;
+ if (hdr->trace_locked) {
+ trace_enabled = 0;
+ puts("trace: recursion detected, disabling\n");
+ hdr->trace_locked = false;
+ return;
+ }
+
+ hdr->trace_locked = true;
trace_swap_gd();
add_ftrace(func_ptr, caller, FUNCF_ENTRY);
func = func_ptr_to_num(func_ptr);
@@ -154,9 +152,10 @@ void notrace __cyg_profile_func_enter(void *func_ptr, void *caller)
hdr->untracked_count++;
}
hdr->depth++;
- if (hdr->depth > hdr->depth_limit)
+ if (hdr->depth > hdr->max_depth)
hdr->max_depth = hdr->depth;
trace_swap_gd();
+ hdr->trace_locked = false;
}
}
@@ -170,8 +169,10 @@ void notrace __cyg_profile_func_exit(void *func_ptr, void *caller)
{
if (trace_enabled) {
trace_swap_gd();
- add_ftrace(func_ptr, caller, FUNCF_EXIT);
hdr->depth--;
+ add_ftrace(func_ptr, caller, FUNCF_EXIT);
+ if (hdr->depth < hdr->min_depth)
+ hdr->min_depth = hdr->depth;
trace_swap_gd();
}
}
@@ -278,8 +279,11 @@ int trace_list_calls(void *buff, size_t buff_size, size_t *needed)
/* Update the header */
if (output_hdr) {
+ memset(output_hdr, '\0', sizeof(*output_hdr));
output_hdr->rec_count = upto;
output_hdr->type = TRACE_CHUNK_CALLS;
+ output_hdr->version = TRACE_VERSION;
+ output_hdr->text_base = CONFIG_TEXT_BASE;
}
/* Work out how must of the buffer we used */
@@ -318,11 +322,17 @@ void trace_print_stats(void)
printf(" (%lu dropped due to overflow)",
hdr->ftrace_count - hdr->ftrace_size);
}
- puts("\n");
- printf("%15d maximum observed call depth\n", hdr->max_depth);
+
+ /* Add in minimum depth since the trace did not start at top level */
+ printf("\n%15d maximum observed call depth\n",
+ hdr->max_depth - hdr->min_depth);
printf("%15d call depth limit\n", hdr->depth_limit);
print_grouped_ull(hdr->ftrace_too_deep_count, 10);
puts(" calls not traced due to depth\n");
+ print_grouped_ull(hdr->ftrace_size, 10);
+ puts(" max function calls\n");
+ printf("\ntrace buffer %lx call records %lx\n",
+ (ulong)map_to_sysmem(hdr), (ulong)map_to_sysmem(hdr->ftrace));
}
void notrace trace_set_enabled(int enabled)
@@ -330,6 +340,17 @@ void notrace trace_set_enabled(int enabled)
trace_enabled = enabled != 0;
}
+static int get_func_count(void)
+{
+ /* Detect no support for mon_len since this means tracing cannot work */
+ if (IS_ENABLED(CONFIG_SANDBOX) && !gd->mon_len) {
+ puts("Tracing is not supported on this board\n");
+ return -ENOTSUPP;
+ }
+
+ return gd->mon_len / FUNC_SITE_SIZE;
+}
+
/**
* trace_init() - initialize the tracing system and enable it
*
@@ -339,16 +360,18 @@ void notrace trace_set_enabled(int enabled)
*/
int notrace trace_init(void *buff, size_t buff_size)
{
- ulong func_count = gd->mon_len / FUNC_SITE_SIZE;
+ int func_count = get_func_count();
size_t needed;
int was_disabled = !trace_enabled;
+ if (func_count < 0)
+ return func_count;
trace_save_gd();
if (!was_disabled) {
#ifdef CONFIG_TRACE_EARLY
+ ulong used, count;
char *end;
- ulong used;
/*
* Copy over the early trace data if we have it. Disable
@@ -357,12 +380,19 @@ int notrace trace_init(void *buff, size_t buff_size)
trace_enabled = 0;
hdr = map_sysmem(CONFIG_TRACE_EARLY_ADDR,
CONFIG_TRACE_EARLY_SIZE);
- end = (char *)&hdr->ftrace[min(hdr->ftrace_count,
- hdr->ftrace_size)];
+ count = min(hdr->ftrace_count, hdr->ftrace_size);
+ end = (char *)&hdr->ftrace[count];
used = end - (char *)hdr;
printf("trace: copying %08lx bytes of early data from %x to %08lx\n",
used, CONFIG_TRACE_EARLY_ADDR,
(ulong)map_to_sysmem(buff));
+ printf("%lu traced function calls", count);
+ if (hdr->ftrace_count > hdr->ftrace_size) {
+ printf(" (%lu dropped due to overflow)",
+ hdr->ftrace_count - hdr->ftrace_size);
+ hdr->ftrace_count = hdr->ftrace_size;
+ }
+ puts("\n");
memcpy(buff, hdr, used);
#else
puts("trace: already enabled\n");
@@ -372,23 +402,24 @@ int notrace trace_init(void *buff, size_t buff_size)
hdr = (struct trace_hdr *)buff;
needed = sizeof(*hdr) + func_count * sizeof(uintptr_t);
if (needed > buff_size) {
- printf("trace: buffer size %zd bytes: at least %zd needed\n",
+ printf("trace: buffer size %zx bytes: at least %zx needed\n",
buff_size, needed);
return -ENOSPC;
}
- if (was_disabled)
+ if (was_disabled) {
memset(hdr, '\0', needed);
+ hdr->min_depth = INT_MAX;
+ }
hdr->func_count = func_count;
hdr->call_accum = (uintptr_t *)(hdr + 1);
/* Use any remaining space for the timed function trace */
hdr->ftrace = (struct trace_call *)(buff + needed);
hdr->ftrace_size = (buff_size - needed) / sizeof(*hdr->ftrace);
- add_textbase();
+ hdr->depth_limit = CONFIG_TRACE_CALL_DEPTH_LIMIT;
puts("trace: enabled\n");
- hdr->depth_limit = CONFIG_TRACE_CALL_DEPTH_LIMIT;
trace_enabled = 1;
trace_inited = 1;
@@ -403,10 +434,12 @@ int notrace trace_init(void *buff, size_t buff_size)
*/
int notrace trace_early_init(void)
{
- ulong func_count = gd->mon_len / FUNC_SITE_SIZE;
+ int func_count = get_func_count();
size_t buff_size = CONFIG_TRACE_EARLY_SIZE;
size_t needed;
+ if (func_count < 0)
+ return func_count;
/* We can ignore additional calls to this function */
if (trace_enabled)
return 0;
@@ -414,7 +447,7 @@ int notrace trace_early_init(void)
hdr = map_sysmem(CONFIG_TRACE_EARLY_ADDR, CONFIG_TRACE_EARLY_SIZE);
needed = sizeof(*hdr) + func_count * sizeof(uintptr_t);
if (needed > buff_size) {
- printf("trace: buffer size is %zd bytes, at least %zd needed\n",
+ printf("trace: buffer size is %zx bytes, at least %zx needed\n",
buff_size, needed);
return -ENOSPC;
}
@@ -422,11 +455,11 @@ int notrace trace_early_init(void)
memset(hdr, '\0', needed);
hdr->call_accum = (uintptr_t *)(hdr + 1);
hdr->func_count = func_count;
+ hdr->min_depth = INT_MAX;
/* Use any remaining space for the timed function trace */
hdr->ftrace = (struct trace_call *)((char *)hdr + needed);
hdr->ftrace_size = (buff_size - needed) / sizeof(*hdr->ftrace);
- add_textbase();
hdr->depth_limit = CONFIG_TRACE_EARLY_CALL_DEPTH_LIMIT;
printf("trace: early enable at %08x\n", CONFIG_TRACE_EARLY_ADDR);
generated by cgit v1.2.3 (git 2.39.1) at 2025-05-29 15:46:26 +0000