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when option DEBUG_LOCKS is used. Trap frames are determined by checking whether the caller was one of the tl0_*() or tl1_*() asm functions via a newly added pair of dummy symbols in exception.S which mark the begin and end of these functions. The tl_trap_* pair marks those in the special .trap section and the tl_text_* in the regular .text section. Because of their performance penalty db_search_symbol()/db_symbol_values() and linker_ddb_search_symbol()/linker_ddb_symbol_values() aren't used here for determining the caller, with db_search_symbol()/db_symbol_values() additionally not being reentrant. - For consistency, change db_backtrace() to also use the new markers for determining the tl0_*() and tl1_*() asm functions instead of bcmp()'ing the symbol name. - Use FBSDID in db_trace.c. PR: 93226 Based on a patch by: Antoine Brodin <antoine.brodin@laposte.net> Ok'ed by: jhb |
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