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Since the decoding of the length and offset is performed in multiple locations is the code, we define a static helper function to replace/cleanup the existing open coded conversions. Suggested-by: Steven Rostedt Signed-off-by: Yordan Karadzhov (VMware) --- src/event-parse.c | 134 ++++++++++++++++++++++------------------------ 1 file changed, 63 insertions(+), 71 deletions(-) diff --git a/src/event-parse.c b/src/event-parse.c index f42ae38..fd6d916 100644 --- a/src/event-parse.c +++ b/src/event-parse.c @@ -3858,6 +3858,36 @@ static unsigned long long test_for_symbol(struct tep_handle *tep, return val; } +#define TEP_OFFSET_LEN_MASK 0xffff +#define TEP_LEN_SHIFT 16 + +static void dynamic_offset(struct tep_handle *tep, int size, void *data, + unsigned int *offset, unsigned int *len) +{ + unsigned long long val; + + /* + * The total allocated length of the dynamic array is + * stored in the top half of the field and the offset + * is in the bottom half of the 32 bit field. + */ + val = tep_read_number(tep, data, size); + + if (offset) + *offset = (unsigned int)(val & TEP_OFFSET_LEN_MASK); + if (len) + *len = (unsigned int)((val >> TEP_LEN_SHIFT) & TEP_OFFSET_LEN_MASK); +} + +static inline void dynamic_offset_field(struct tep_handle *tep, + struct tep_format_field *field, + void *data, + unsigned int *offset, + unsigned int *len) +{ + dynamic_offset(tep, field->size, data + field->offset, offset, len); +} + static unsigned long long eval_num_arg(void *data, int size, struct tep_event *event, struct tep_print_arg *arg) { @@ -3866,7 +3896,7 @@ eval_num_arg(void *data, int size, struct tep_event *event, struct tep_print_arg unsigned long long left, right; struct tep_print_arg *typearg = NULL; struct tep_print_arg *larg; - unsigned long offset; + unsigned int offset; unsigned int field_size; switch (arg->type) { @@ -3930,18 +3960,11 @@ eval_num_arg(void *data, int size, struct tep_event *event, struct tep_print_arg switch (larg->type) { case TEP_PRINT_DYNAMIC_ARRAY: - offset = tep_read_number(tep, - data + larg->dynarray.field->offset, - larg->dynarray.field->size); + dynamic_offset_field(tep, larg->dynarray.field, data, + &offset, NULL); + offset += right; if (larg->dynarray.field->elementsize) field_size = larg->dynarray.field->elementsize; - /* - * The actual length of the dynamic array is stored - * in the top half of the field, and the offset - * is in the bottom half of the 32 bit field. - */ - offset &= 0xffff; - offset += right; break; case TEP_PRINT_FIELD: if (!larg->field.field) { @@ -4060,27 +4083,14 @@ eval_num_arg(void *data, int size, struct tep_event *event, struct tep_print_arg } break; case TEP_PRINT_DYNAMIC_ARRAY_LEN: - offset = tep_read_number(tep, - data + arg->dynarray.field->offset, - arg->dynarray.field->size); - /* - * The total allocated length of the dynamic array is - * stored in the top half of the field, and the offset - * is in the bottom half of the 32 bit field. - */ - val = (unsigned long long)(offset >> 16); + dynamic_offset_field(tep, arg->dynarray.field, data, + NULL, &field_size); + val = (unsigned long long) field_size; break; case TEP_PRINT_DYNAMIC_ARRAY: /* Without [], we pass the address to the dynamic data */ - offset = tep_read_number(tep, - data + arg->dynarray.field->offset, - arg->dynarray.field->size); - /* - * The total allocated length of the dynamic array is - * stored in the top half of the field, and the offset - * is in the bottom half of the 32 bit field. - */ - offset &= 0xffff; + dynamic_offset_field(tep, arg->dynarray.field, data, + &offset, NULL); val = (unsigned long long)((unsigned long)data + offset); break; default: /* not sure what to do there */ @@ -4209,12 +4219,13 @@ static void print_str_arg(struct trace_seq *s, void *data, int size, struct tep_print_flag_sym *flag; struct tep_format_field *field; struct printk_map *printk; + unsigned int offset, len; long long val, fval; unsigned long long addr; char *str; unsigned char *hex; int print; - int i, len; + int i; switch (arg->type) { case TEP_PRINT_NULL: @@ -4318,11 +4329,9 @@ static void print_str_arg(struct trace_seq *s, void *data, int size, case TEP_PRINT_HEX: case TEP_PRINT_HEX_STR: if (arg->hex.field->type == TEP_PRINT_DYNAMIC_ARRAY) { - unsigned long offset; - offset = tep_read_number(tep, - data + arg->hex.field->dynarray.field->offset, - arg->hex.field->dynarray.field->size); - hex = data + (offset & 0xffff); + dynamic_offset_field(tep, arg->hex.field->dynarray.field, data, + &offset, NULL); + hex = data + offset; } else { field = arg->hex.field->field.field; if (!field) { @@ -4347,13 +4356,9 @@ static void print_str_arg(struct trace_seq *s, void *data, int size, int el_size; if (arg->int_array.field->type == TEP_PRINT_DYNAMIC_ARRAY) { - unsigned long offset; - struct tep_format_field *field = - arg->int_array.field->dynarray.field; - offset = tep_read_number(tep, - data + field->offset, - field->size); - num = data + (offset & 0xffff); + dynamic_offset_field(tep, arg->int_array.field->dynarray.field, data, + &offset, NULL); + num = data + offset; } else { field = arg->int_array.field->field.field; if (!field) { @@ -4393,42 +4398,33 @@ static void print_str_arg(struct trace_seq *s, void *data, int size, case TEP_PRINT_TYPE: break; case TEP_PRINT_STRING: { - int str_offset; - int len; - if (arg->string.offset == -1) { struct tep_format_field *f; f = tep_find_any_field(event, arg->string.string); arg->string.offset = f->offset; } - str_offset = data2host4(tep, *(unsigned int *)(data + arg->string.offset)); - len = (str_offset >> 16) & 0xffff; + dynamic_offset(tep, 4, data + arg->string.offset, &offset, &len); /* Do not attempt to save zero length dynamic strings */ if (!len) break; - str_offset &= 0xffff; - print_str_to_seq(s, format, len_arg, ((char *)data) + str_offset); + offset &= TEP_OFFSET_LEN_MASK; + print_str_to_seq(s, format, len_arg, ((char *)data) + offset); break; } case TEP_PRINT_BSTRING: print_str_to_seq(s, format, len_arg, arg->string.string); break; case TEP_PRINT_BITMASK: { - int bitmask_offset; - int bitmask_size; - if (arg->bitmask.offset == -1) { struct tep_format_field *f; f = tep_find_any_field(event, arg->bitmask.bitmask); arg->bitmask.offset = f->offset; } - bitmask_offset = data2host4(tep, *(unsigned int *)(data + arg->bitmask.offset)); - bitmask_size = bitmask_offset >> 16; - bitmask_offset &= 0xffff; + dynamic_offset(tep, 4, data + arg->bitmask.offset, &offset, &len); print_bitmask_to_seq(tep, s, format, len_arg, - data + bitmask_offset, bitmask_size); + data + offset, len); break; } case TEP_PRINT_OP: @@ -5271,13 +5267,12 @@ static int print_raw_buff_arg(struct trace_seq *s, const char *ptr, void *data, int size, struct tep_event *event, struct tep_print_arg *arg, int print_len) { + unsigned int offset, arr_len; int plen = print_len; char *delim = " "; int ret = 0; char *buf; int i; - unsigned long offset; - int arr_len; switch (*(ptr + 1)) { case 'C': @@ -5304,11 +5299,9 @@ static int print_raw_buff_arg(struct trace_seq *s, const char *ptr, return ret; } - offset = tep_read_number(event->tep, - data + arg->dynarray.field->offset, - arg->dynarray.field->size); - arr_len = (unsigned long long)(offset >> 16); - buf = data + (offset & 0xffff); + dynamic_offset_field(event->tep, arg->dynarray.field, data, + &offset, &arr_len); + buf = data + offset; if (arr_len < plen) plen = arr_len; @@ -5336,19 +5329,18 @@ static int is_printable_array(char *p, unsigned int len) void tep_print_field(struct trace_seq *s, void *data, struct tep_format_field *field) { - unsigned long long val; - unsigned int offset, len, i; struct tep_handle *tep = field->event->tep; + unsigned int offset, len, i; + unsigned long long val; if (field->flags & TEP_FIELD_IS_ARRAY) { - offset = field->offset; - len = field->size; if (field->flags & TEP_FIELD_IS_DYNAMIC) { - val = tep_read_number(tep, data + offset, len); - offset = val; - len = offset >> 16; - offset &= 0xffff; + dynamic_offset_field(tep, field, data, &offset, &len); + } else { + offset = field->offset; + len = field->size; } + if (field->flags & TEP_FIELD_IS_STRING && is_printable_array(data + offset, len)) { trace_seq_printf(s, "%s", (char *)data + offset);