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Diffstat (limited to 'Documentation/trace/kprobetrace.rst')
| -rw-r--r-- | Documentation/trace/kprobetrace.rst | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/trace/kprobetrace.rst b/Documentation/trace/kprobetrace.rst index fbb314bfa112..cc4c5fc313df 100644 --- a/Documentation/trace/kprobetrace.rst +++ b/Documentation/trace/kprobetrace.rst @@ -52,6 +52,7 @@ Synopsis of kprobe_events $retval : Fetch return value.(\*2) $comm : Fetch current task comm. +|-[u]OFFS(FETCHARG) : Fetch memory at FETCHARG +|- OFFS address.(\*3)(\*4) + \IMM : Store an immediate value to the argument. NAME=FETCHARG : Set NAME as the argument name of FETCHARG. FETCHARG:TYPE : Set TYPE as the type of FETCHARG. Currently, basic types (u8/u16/u32/u64/s8/s16/s32/s64), hexadecimal types @@ -96,6 +97,7 @@ which shows given pointer in "symbol+offset" style. For $comm, the default type is "string"; any other type is invalid. .. _user_mem_access: + User Memory Access ------------------ Kprobe events supports user-space memory access. For that purpose, you can use @@ -251,4 +253,3 @@ And you can see the traced information via /sys/kernel/debug/tracing/trace. Each line shows when the kernel hits an event, and <- SYMBOL means kernel returns from SYMBOL(e.g. "sys_open+0x1b/0x1d <- do_sys_open" means kernel returns from do_sys_open to sys_open+0x1b). - |
