diff options
Diffstat (limited to 'kernel/trace/trace_kprobe.c')
| -rw-r--r-- | kernel/trace/trace_kprobe.c | 60 |
1 files changed, 37 insertions, 23 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 97309d4714f..f63ead0cc5c 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -220,24 +220,24 @@ static int probe_arg_string(char *buf, size_t n, struct fetch_func *ff) int ret = -EINVAL; if (ff->func == fetch_argument) - ret = snprintf(buf, n, "a%lu", (unsigned long)ff->data); + ret = snprintf(buf, n, "$a%lu", (unsigned long)ff->data); else if (ff->func == fetch_register) { const char *name; name = regs_query_register_name((unsigned int)((long)ff->data)); ret = snprintf(buf, n, "%%%s", name); } else if (ff->func == fetch_stack) - ret = snprintf(buf, n, "s%lu", (unsigned long)ff->data); + ret = snprintf(buf, n, "$s%lu", (unsigned long)ff->data); else if (ff->func == fetch_memory) ret = snprintf(buf, n, "@0x%p", ff->data); else if (ff->func == fetch_symbol) { struct symbol_cache *sc = ff->data; ret = snprintf(buf, n, "@%s%+ld", sc->symbol, sc->offset); } else if (ff->func == fetch_retvalue) - ret = snprintf(buf, n, "rv"); + ret = snprintf(buf, n, "$rv"); else if (ff->func == fetch_ip) - ret = snprintf(buf, n, "ra"); + ret = snprintf(buf, n, "$ra"); else if (ff->func == fetch_stack_address) - ret = snprintf(buf, n, "sa"); + ret = snprintf(buf, n, "$sa"); else if (ff->func == fetch_indirect) { struct indirect_fetch_data *id = ff->data; size_t l = 0; @@ -429,12 +429,10 @@ static int split_symbol_offset(char *symbol, unsigned long *offset) #define PARAM_MAX_ARGS 16 #define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long)) -static int parse_probe_arg(char *arg, struct fetch_func *ff, int is_return) +static int parse_probe_vars(char *arg, struct fetch_func *ff, int is_return) { int ret = 0; unsigned long param; - long offset; - char *tmp; switch (arg[0]) { case 'a': /* argument */ @@ -456,14 +454,6 @@ static int parse_probe_arg(char *arg, struct fetch_func *ff, int is_return) } else ret = -EINVAL; break; - case '%': /* named register */ - ret = regs_query_register_offset(arg + 1); - if (ret >= 0) { - ff->func = fetch_register; - ff->data = (void *)(unsigned long)ret; - ret = 0; - } - break; case 's': /* stack */ if (arg[1] == 'a') { ff->func = fetch_stack_address; @@ -478,6 +468,31 @@ static int parse_probe_arg(char *arg, struct fetch_func *ff, int is_return) } } break; + default: + ret = -EINVAL; + } + return ret; +} + +static int parse_probe_arg(char *arg, struct fetch_func *ff, int is_return) +{ + int ret = 0; + unsigned long param; + long offset; + char *tmp; + + switch (arg[0]) { + case '$': + ret = parse_probe_vars(arg + 1, ff, is_return); + break; + case '%': /* named register */ + ret = regs_query_register_offset(arg + 1); + if (ret >= 0) { + ff->func = fetch_register; + ff->data = (void *)(unsigned long)ret; + ret = 0; + } + break; case '@': /* memory or symbol */ if (isdigit(arg[1])) { ret = strict_strtoul(arg + 1, 0, ¶m); @@ -489,8 +504,7 @@ static int parse_probe_arg(char *arg, struct fetch_func *ff, int is_return) ret = split_symbol_offset(arg + 1, &offset); if (ret) break; - ff->data = alloc_symbol_cache(arg + 1, - offset); + ff->data = alloc_symbol_cache(arg + 1, offset); if (ff->data) ff->func = fetch_symbol; else @@ -544,11 +558,11 @@ static int create_trace_probe(int argc, char **argv) * - Add kprobe: p[:[GRP/]EVENT] KSYM[+OFFS]|KADDR [FETCHARGS] * - Add kretprobe: r[:[GRP/]EVENT] KSYM[+0] [FETCHARGS] * Fetch args: - * aN : fetch Nth of function argument. (N:0-) - * rv : fetch return value - * ra : fetch return address - * sa : fetch stack address - * sN : fetch Nth of stack (N:0-) + * $aN : fetch Nth of function argument. (N:0-) + * $rv : fetch return value + * $ra : fetch return address + * $sa : fetch stack address + * $sN : fetch Nth of stack (N:0-) * @ADDR : fetch memory at ADDR (ADDR should be in kernel) * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) * %REG : fetch register REG |