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trace: Detect an infinite loop

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If something is wrong with a board's timer function such that it calls
functions not marked with notrace, U-Boot will hang.

Detect this, print a message and disable the trace.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2023-01-15 14:15:51 -07:00 • committed by Tom Rini
parent 80f91558a1
commit 852d4dbd70
1 changed files with 10 additions and 0 deletions
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10
lib/trace.c
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@ -39,6 +39,7 @@ struct trace_hdr {
int depth_limit; /* Depth limit to trace to */ int depth_limit; /* Depth limit to trace to */
int max_depth; /* Maximum depth seen so far */ int max_depth; /* Maximum depth seen so far */
int min_depth; /* Minimum 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 */ /* Pointer to start of trace buffer */
@ -133,6 +134,14 @@ void notrace __cyg_profile_func_enter(void *func_ptr, void *caller)
if (trace_enabled) { if (trace_enabled) {
int func; 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(); trace_swap_gd();
add_ftrace(func_ptr, caller, FUNCF_ENTRY); add_ftrace(func_ptr, caller, FUNCF_ENTRY);
func = func_ptr_to_num(func_ptr); func = func_ptr_to_num(func_ptr);
@ -146,6 +155,7 @@ void notrace __cyg_profile_func_enter(void *func_ptr, void *caller)
if (hdr->depth > hdr->max_depth) if (hdr->depth > hdr->max_depth)
hdr->max_depth = hdr->depth; hdr->max_depth = hdr->depth;
trace_swap_gd(); trace_swap_gd();
hdr->trace_locked = false;
} }
} }