From: Masami Hiramatsu (Google) <[email protected]> Add new module_text_offsets event which records the offset of module text and init_text section address and size.
This information is required for decoding the relative stacktrace entries for modules. Signed-off-by: Masami Hiramatsu (Google) <[email protected]> --- include/trace/events/module.h | 40 ++++++++++++++++++++++++++++++++++++++++ kernel/module/main.c | 1 + 2 files changed, 41 insertions(+) diff --git a/include/trace/events/module.h b/include/trace/events/module.h index e5a006be9dc6..1e5c84cc8d15 100644 --- a/include/trace/events/module.h +++ b/include/trace/events/module.h @@ -47,6 +47,46 @@ TRACE_EVENT(module_load, TP_printk("%s %s", __get_str(name), show_module_flags(__entry->taints)) ); +/* Module address offset from _stext */ +TRACE_EVENT(module_text_offsets, + + TP_PROTO(struct module *mod), + + TP_ARGS(mod), + + TP_STRUCT__entry( + __string( name, mod->name ) + __field( unsigned long, text_offset ) + __field( unsigned int, text_size ) + __field( unsigned long, init_offset ) + __field( unsigned int, init_size ) + ), + + TP_fast_assign( + if (mod->mem[MOD_TEXT].size) { + __entry->text_offset = (unsigned long)mod->mem[MOD_TEXT].base + - (unsigned long)_stext; + __entry->text_size = mod->mem[MOD_TEXT].size; + } else { + __entry->text_offset = 0; + __entry->text_size = 0; + } + if (mod->mem[MOD_INIT_TEXT].size) { + __entry->init_offset = (unsigned long)mod->mem[MOD_INIT_TEXT].base + - (unsigned long)_stext; + __entry->init_size = mod->mem[MOD_INIT_TEXT].size; + } else { + __entry->init_offset = 0; + __entry->init_size = 0; + } + __assign_str(name); + ), + + TP_printk("%s text_offset=0x%lx text_size=%d init_offset=0x%lx init_size=%d", + __get_str(name), __entry->text_offset, __entry->text_size, + __entry->init_offset, __entry->init_size) +); + TRACE_EVENT(module_free, TP_PROTO(struct module *mod), diff --git a/kernel/module/main.c b/kernel/module/main.c index 5399c182b3cb..9f1ca8730a71 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -3372,6 +3372,7 @@ static int load_module(struct load_info *info, const char __user *uargs, /* Done! */ trace_module_load(mod); + trace_module_text_offsets(mod); return do_init_module(mod);
