+++ /dev/null
-/*
- * lttng-filter-interpreter.c
- *
- * LTTng modules filter interpreter.
- *
- * Copyright (C) 2010-2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <linux/uaccess.h>
-
-#include "lttng-filter.h"
-
-/*
- * get_char should be called with page fault handler disabled if it is expected
- * to handle user-space read.
- */
-static
-char get_char(struct estack_entry *reg, size_t offset)
-{
- if (unlikely(offset >= reg->u.s.seq_len))
- return '\0';
- if (reg->u.s.user) {
- char c;
-
- /* Handle invalid access as end of string. */
- if (unlikely(!access_ok(VERIFY_READ,
- reg->u.s.user_str + offset,
- sizeof(c))))
- return '\0';
- /* Handle fault (nonzero return value) as end of string. */
- if (unlikely(__copy_from_user_inatomic(&c,
- reg->u.s.user_str + offset,
- sizeof(c))))
- return '\0';
- return c;
- } else {
- return reg->u.s.str[offset];
- }
-}
-
-/*
- * -1: wildcard found.
- * -2: unknown escape char.
- * 0: normal char.
- */
-static
-int parse_char(struct estack_entry *reg, char *c, size_t *offset)
-{
- switch (*c) {
- case '\\':
- (*offset)++;
- *c = get_char(reg, *offset);
- switch (*c) {
- case '\\':
- case '*':
- return 0;
- default:
- return -2;
- }
- case '*':
- return -1;
- default:
- return 0;
- }
-}
-
-static
-int stack_strcmp(struct estack *stack, int top, const char *cmp_type)
-{
- size_t offset_bx = 0, offset_ax = 0;
- int diff, has_user = 0;
- mm_segment_t old_fs;
-
- if (estack_bx(stack, top)->u.s.user
- || estack_ax(stack, top)->u.s.user) {
- has_user = 1;
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- pagefault_disable();
- }
-
- for (;;) {
- int ret;
- int escaped_r0 = 0;
- char char_bx, char_ax;
-
- char_bx = get_char(estack_bx(stack, top), offset_bx);
- char_ax = get_char(estack_ax(stack, top), offset_ax);
-
- if (unlikely(char_bx == '\0')) {
- if (char_ax == '\0') {
- diff = 0;
- break;
- } else {
- if (estack_ax(stack, top)->u.s.literal) {
- ret = parse_char(estack_ax(stack, top),
- &char_ax, &offset_ax);
- if (ret == -1) {
- diff = 0;
- break;
- }
- }
- diff = -1;
- break;
- }
- }
- if (unlikely(char_ax == '\0')) {
- if (char_bx == '\0') {
- diff = 0;
- break;
- } else {
- if (estack_bx(stack, top)->u.s.literal) {
- ret = parse_char(estack_bx(stack, top),
- &char_bx, &offset_bx);
- if (ret == -1) {
- diff = 0;
- break;
- }
- }
- diff = 1;
- break;
- }
- }
- if (estack_bx(stack, top)->u.s.literal) {
- ret = parse_char(estack_bx(stack, top),
- &char_bx, &offset_bx);
- if (ret == -1) {
- diff = 0;
- break;
- } else if (ret == -2) {
- escaped_r0 = 1;
- }
- /* else compare both char */
- }
- if (estack_ax(stack, top)->u.s.literal) {
- ret = parse_char(estack_ax(stack, top),
- &char_ax, &offset_ax);
- if (ret == -1) {
- diff = 0;
- break;
- } else if (ret == -2) {
- if (!escaped_r0) {
- diff = -1;
- break;
- }
- } else {
- if (escaped_r0) {
- diff = 1;
- break;
- }
- }
- } else {
- if (escaped_r0) {
- diff = 1;
- break;
- }
- }
- diff = char_bx - char_ax;
- if (diff != 0)
- break;
- offset_bx++;
- offset_ax++;
- }
- if (has_user) {
- pagefault_enable();
- set_fs(old_fs);
- }
- return diff;
-}
-
-uint64_t lttng_filter_false(void *filter_data,
- struct lttng_probe_ctx *lttng_probe_ctx,
- const char *filter_stack_data)
-{
- return 0;
-}
-
-#ifdef INTERPRETER_USE_SWITCH
-
-/*
- * Fallback for compilers that do not support taking address of labels.
- */
-
-#define START_OP \
- start_pc = &bytecode->data[0]; \
- for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; \
- pc = next_pc) { \
- dbg_printk("Executing op %s (%u)\n", \
- lttng_filter_print_op((unsigned int) *(filter_opcode_t *) pc), \
- (unsigned int) *(filter_opcode_t *) pc); \
- switch (*(filter_opcode_t *) pc) {
-
-#define OP(name) case name
-
-#define PO break
-
-#define END_OP } \
- }
-
-#else
-
-/*
- * Dispatch-table based interpreter.
- */
-
-#define START_OP \
- start_pc = &bytecode->data[0]; \
- pc = next_pc = start_pc; \
- if (unlikely(pc - start_pc >= bytecode->len)) \
- goto end; \
- goto *dispatch[*(filter_opcode_t *) pc];
-
-#define OP(name) \
-LABEL_##name
-
-#define PO \
- pc = next_pc; \
- goto *dispatch[*(filter_opcode_t *) pc];
-
-#define END_OP
-
-#endif
-
-/*
- * Return 0 (discard), or raise the 0x1 flag (log event).
- * Currently, other flags are kept for future extensions and have no
- * effect.
- */
-uint64_t lttng_filter_interpret_bytecode(void *filter_data,
- struct lttng_probe_ctx *lttng_probe_ctx,
- const char *filter_stack_data)
-{
- struct bytecode_runtime *bytecode = filter_data;
- void *pc, *next_pc, *start_pc;
- int ret = -EINVAL;
- uint64_t retval = 0;
- struct estack _stack;
- struct estack *stack = &_stack;
- register int64_t ax = 0, bx = 0;
- register int top = FILTER_STACK_EMPTY;
-#ifndef INTERPRETER_USE_SWITCH
- static void *dispatch[NR_FILTER_OPS] = {
- [ FILTER_OP_UNKNOWN ] = &&LABEL_FILTER_OP_UNKNOWN,
-
- [ FILTER_OP_RETURN ] = &&LABEL_FILTER_OP_RETURN,
-
- /* binary */
- [ FILTER_OP_MUL ] = &&LABEL_FILTER_OP_MUL,
- [ FILTER_OP_DIV ] = &&LABEL_FILTER_OP_DIV,
- [ FILTER_OP_MOD ] = &&LABEL_FILTER_OP_MOD,
- [ FILTER_OP_PLUS ] = &&LABEL_FILTER_OP_PLUS,
- [ FILTER_OP_MINUS ] = &&LABEL_FILTER_OP_MINUS,
- [ FILTER_OP_RSHIFT ] = &&LABEL_FILTER_OP_RSHIFT,
- [ FILTER_OP_LSHIFT ] = &&LABEL_FILTER_OP_LSHIFT,
- [ FILTER_OP_BIN_AND ] = &&LABEL_FILTER_OP_BIN_AND,
- [ FILTER_OP_BIN_OR ] = &&LABEL_FILTER_OP_BIN_OR,
- [ FILTER_OP_BIN_XOR ] = &&LABEL_FILTER_OP_BIN_XOR,
-
- /* binary comparators */
- [ FILTER_OP_EQ ] = &&LABEL_FILTER_OP_EQ,
- [ FILTER_OP_NE ] = &&LABEL_FILTER_OP_NE,
- [ FILTER_OP_GT ] = &&LABEL_FILTER_OP_GT,
- [ FILTER_OP_LT ] = &&LABEL_FILTER_OP_LT,
- [ FILTER_OP_GE ] = &&LABEL_FILTER_OP_GE,
- [ FILTER_OP_LE ] = &&LABEL_FILTER_OP_LE,
-
- /* string binary comparator */
- [ FILTER_OP_EQ_STRING ] = &&LABEL_FILTER_OP_EQ_STRING,
- [ FILTER_OP_NE_STRING ] = &&LABEL_FILTER_OP_NE_STRING,
- [ FILTER_OP_GT_STRING ] = &&LABEL_FILTER_OP_GT_STRING,
- [ FILTER_OP_LT_STRING ] = &&LABEL_FILTER_OP_LT_STRING,
- [ FILTER_OP_GE_STRING ] = &&LABEL_FILTER_OP_GE_STRING,
- [ FILTER_OP_LE_STRING ] = &&LABEL_FILTER_OP_LE_STRING,
-
- /* s64 binary comparator */
- [ FILTER_OP_EQ_S64 ] = &&LABEL_FILTER_OP_EQ_S64,
- [ FILTER_OP_NE_S64 ] = &&LABEL_FILTER_OP_NE_S64,
- [ FILTER_OP_GT_S64 ] = &&LABEL_FILTER_OP_GT_S64,
- [ FILTER_OP_LT_S64 ] = &&LABEL_FILTER_OP_LT_S64,
- [ FILTER_OP_GE_S64 ] = &&LABEL_FILTER_OP_GE_S64,
- [ FILTER_OP_LE_S64 ] = &&LABEL_FILTER_OP_LE_S64,
-
- /* double binary comparator */
- [ FILTER_OP_EQ_DOUBLE ] = &&LABEL_FILTER_OP_EQ_DOUBLE,
- [ FILTER_OP_NE_DOUBLE ] = &&LABEL_FILTER_OP_NE_DOUBLE,
- [ FILTER_OP_GT_DOUBLE ] = &&LABEL_FILTER_OP_GT_DOUBLE,
- [ FILTER_OP_LT_DOUBLE ] = &&LABEL_FILTER_OP_LT_DOUBLE,
- [ FILTER_OP_GE_DOUBLE ] = &&LABEL_FILTER_OP_GE_DOUBLE,
- [ FILTER_OP_LE_DOUBLE ] = &&LABEL_FILTER_OP_LE_DOUBLE,
-
- /* Mixed S64-double binary comparators */
- [ FILTER_OP_EQ_DOUBLE_S64 ] = &&LABEL_FILTER_OP_EQ_DOUBLE_S64,
- [ FILTER_OP_NE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_NE_DOUBLE_S64,
- [ FILTER_OP_GT_DOUBLE_S64 ] = &&LABEL_FILTER_OP_GT_DOUBLE_S64,
- [ FILTER_OP_LT_DOUBLE_S64 ] = &&LABEL_FILTER_OP_LT_DOUBLE_S64,
- [ FILTER_OP_GE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_GE_DOUBLE_S64,
- [ FILTER_OP_LE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_LE_DOUBLE_S64,
-
- [ FILTER_OP_EQ_S64_DOUBLE ] = &&LABEL_FILTER_OP_EQ_S64_DOUBLE,
- [ FILTER_OP_NE_S64_DOUBLE ] = &&LABEL_FILTER_OP_NE_S64_DOUBLE,
- [ FILTER_OP_GT_S64_DOUBLE ] = &&LABEL_FILTER_OP_GT_S64_DOUBLE,
- [ FILTER_OP_LT_S64_DOUBLE ] = &&LABEL_FILTER_OP_LT_S64_DOUBLE,
- [ FILTER_OP_GE_S64_DOUBLE ] = &&LABEL_FILTER_OP_GE_S64_DOUBLE,
- [ FILTER_OP_LE_S64_DOUBLE ] = &&LABEL_FILTER_OP_LE_S64_DOUBLE,
-
- /* unary */
- [ FILTER_OP_UNARY_PLUS ] = &&LABEL_FILTER_OP_UNARY_PLUS,
- [ FILTER_OP_UNARY_MINUS ] = &&LABEL_FILTER_OP_UNARY_MINUS,
- [ FILTER_OP_UNARY_NOT ] = &&LABEL_FILTER_OP_UNARY_NOT,
- [ FILTER_OP_UNARY_PLUS_S64 ] = &&LABEL_FILTER_OP_UNARY_PLUS_S64,
- [ FILTER_OP_UNARY_MINUS_S64 ] = &&LABEL_FILTER_OP_UNARY_MINUS_S64,
- [ FILTER_OP_UNARY_NOT_S64 ] = &&LABEL_FILTER_OP_UNARY_NOT_S64,
- [ FILTER_OP_UNARY_PLUS_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_PLUS_DOUBLE,
- [ FILTER_OP_UNARY_MINUS_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_MINUS_DOUBLE,
- [ FILTER_OP_UNARY_NOT_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_NOT_DOUBLE,
-
- /* logical */
- [ FILTER_OP_AND ] = &&LABEL_FILTER_OP_AND,
- [ FILTER_OP_OR ] = &&LABEL_FILTER_OP_OR,
-
- /* load field ref */
- [ FILTER_OP_LOAD_FIELD_REF ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF,
- [ FILTER_OP_LOAD_FIELD_REF_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_STRING,
- [ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_SEQUENCE,
- [ FILTER_OP_LOAD_FIELD_REF_S64 ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_S64,
- [ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_DOUBLE,
-
- /* load from immediate operand */
- [ FILTER_OP_LOAD_STRING ] = &&LABEL_FILTER_OP_LOAD_STRING,
- [ FILTER_OP_LOAD_S64 ] = &&LABEL_FILTER_OP_LOAD_S64,
- [ FILTER_OP_LOAD_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_DOUBLE,
-
- /* cast */
- [ FILTER_OP_CAST_TO_S64 ] = &&LABEL_FILTER_OP_CAST_TO_S64,
- [ FILTER_OP_CAST_DOUBLE_TO_S64 ] = &&LABEL_FILTER_OP_CAST_DOUBLE_TO_S64,
- [ FILTER_OP_CAST_NOP ] = &&LABEL_FILTER_OP_CAST_NOP,
-
- /* get context ref */
- [ FILTER_OP_GET_CONTEXT_REF ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF,
- [ FILTER_OP_GET_CONTEXT_REF_STRING ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_STRING,
- [ FILTER_OP_GET_CONTEXT_REF_S64 ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_S64,
- [ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_DOUBLE,
-
- /* load userspace field ref */
- [ FILTER_OP_LOAD_FIELD_REF_USER_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_USER_STRING,
- [ FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE,
- };
-#endif /* #ifndef INTERPRETER_USE_SWITCH */
-
- START_OP
-
- OP(FILTER_OP_UNKNOWN):
- OP(FILTER_OP_LOAD_FIELD_REF):
- OP(FILTER_OP_GET_CONTEXT_REF):
-#ifdef INTERPRETER_USE_SWITCH
- default:
-#endif /* INTERPRETER_USE_SWITCH */
- printk(KERN_WARNING "unknown bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- OP(FILTER_OP_RETURN):
- /* LTTNG_FILTER_DISCARD or LTTNG_FILTER_RECORD_FLAG */
- retval = !!estack_ax_v;
- ret = 0;
- goto end;
-
- /* binary */
- OP(FILTER_OP_MUL):
- OP(FILTER_OP_DIV):
- OP(FILTER_OP_MOD):
- OP(FILTER_OP_PLUS):
- OP(FILTER_OP_MINUS):
- OP(FILTER_OP_RSHIFT):
- OP(FILTER_OP_LSHIFT):
- OP(FILTER_OP_BIN_AND):
- OP(FILTER_OP_BIN_OR):
- OP(FILTER_OP_BIN_XOR):
- printk(KERN_WARNING "unsupported bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- OP(FILTER_OP_EQ):
- OP(FILTER_OP_NE):
- OP(FILTER_OP_GT):
- OP(FILTER_OP_LT):
- OP(FILTER_OP_GE):
- OP(FILTER_OP_LE):
- printk(KERN_WARNING "unsupported non-specialized bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- OP(FILTER_OP_EQ_STRING):
- {
- int res;
-
- res = (stack_strcmp(stack, top, "==") == 0);
- estack_pop(stack, top, ax, bx);
- estack_ax_v = res;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_NE_STRING):
- {
- int res;
-
- res = (stack_strcmp(stack, top, "!=") != 0);
- estack_pop(stack, top, ax, bx);
- estack_ax_v = res;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_GT_STRING):
- {
- int res;
-
- res = (stack_strcmp(stack, top, ">") > 0);
- estack_pop(stack, top, ax, bx);
- estack_ax_v = res;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_LT_STRING):
- {
- int res;
-
- res = (stack_strcmp(stack, top, "<") < 0);
- estack_pop(stack, top, ax, bx);
- estack_ax_v = res;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_GE_STRING):
- {
- int res;
-
- res = (stack_strcmp(stack, top, ">=") >= 0);
- estack_pop(stack, top, ax, bx);
- estack_ax_v = res;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_LE_STRING):
- {
- int res;
-
- res = (stack_strcmp(stack, top, "<=") <= 0);
- estack_pop(stack, top, ax, bx);
- estack_ax_v = res;
- next_pc += sizeof(struct binary_op);
- PO;
- }
-
- OP(FILTER_OP_EQ_S64):
- {
- int res;
-
- res = (estack_bx_v == estack_ax_v);
- estack_pop(stack, top, ax, bx);
- estack_ax_v = res;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_NE_S64):
- {
- int res;
-
- res = (estack_bx_v != estack_ax_v);
- estack_pop(stack, top, ax, bx);
- estack_ax_v = res;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_GT_S64):
- {
- int res;
-
- res = (estack_bx_v > estack_ax_v);
- estack_pop(stack, top, ax, bx);
- estack_ax_v = res;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_LT_S64):
- {
- int res;
-
- res = (estack_bx_v < estack_ax_v);
- estack_pop(stack, top, ax, bx);
- estack_ax_v = res;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_GE_S64):
- {
- int res;
-
- res = (estack_bx_v >= estack_ax_v);
- estack_pop(stack, top, ax, bx);
- estack_ax_v = res;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_LE_S64):
- {
- int res;
-
- res = (estack_bx_v <= estack_ax_v);
- estack_pop(stack, top, ax, bx);
- estack_ax_v = res;
- next_pc += sizeof(struct binary_op);
- PO;
- }
-
- OP(FILTER_OP_EQ_DOUBLE):
- OP(FILTER_OP_NE_DOUBLE):
- OP(FILTER_OP_GT_DOUBLE):
- OP(FILTER_OP_LT_DOUBLE):
- OP(FILTER_OP_GE_DOUBLE):
- OP(FILTER_OP_LE_DOUBLE):
- {
- BUG_ON(1);
- PO;
- }
-
- /* Mixed S64-double binary comparators */
- OP(FILTER_OP_EQ_DOUBLE_S64):
- OP(FILTER_OP_NE_DOUBLE_S64):
- OP(FILTER_OP_GT_DOUBLE_S64):
- OP(FILTER_OP_LT_DOUBLE_S64):
- OP(FILTER_OP_GE_DOUBLE_S64):
- OP(FILTER_OP_LE_DOUBLE_S64):
- OP(FILTER_OP_EQ_S64_DOUBLE):
- OP(FILTER_OP_NE_S64_DOUBLE):
- OP(FILTER_OP_GT_S64_DOUBLE):
- OP(FILTER_OP_LT_S64_DOUBLE):
- OP(FILTER_OP_GE_S64_DOUBLE):
- OP(FILTER_OP_LE_S64_DOUBLE):
- {
- BUG_ON(1);
- PO;
- }
-
- /* unary */
- OP(FILTER_OP_UNARY_PLUS):
- OP(FILTER_OP_UNARY_MINUS):
- OP(FILTER_OP_UNARY_NOT):
- printk(KERN_WARNING "unsupported non-specialized bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
-
- OP(FILTER_OP_UNARY_PLUS_S64):
- {
- next_pc += sizeof(struct unary_op);
- PO;
- }
- OP(FILTER_OP_UNARY_MINUS_S64):
- {
- estack_ax_v = -estack_ax_v;
- next_pc += sizeof(struct unary_op);
- PO;
- }
- OP(FILTER_OP_UNARY_PLUS_DOUBLE):
- OP(FILTER_OP_UNARY_MINUS_DOUBLE):
- {
- BUG_ON(1);
- PO;
- }
- OP(FILTER_OP_UNARY_NOT_S64):
- {
- estack_ax_v = !estack_ax_v;
- next_pc += sizeof(struct unary_op);
- PO;
- }
- OP(FILTER_OP_UNARY_NOT_DOUBLE):
- {
- BUG_ON(1);
- PO;
- }
-
- /* logical */
- OP(FILTER_OP_AND):
- {
- struct logical_op *insn = (struct logical_op *) pc;
-
- /* If AX is 0, skip and evaluate to 0 */
- if (unlikely(estack_ax_v == 0)) {
- dbg_printk("Jumping to bytecode offset %u\n",
- (unsigned int) insn->skip_offset);
- next_pc = start_pc + insn->skip_offset;
- } else {
- /* Pop 1 when jump not taken */
- estack_pop(stack, top, ax, bx);
- next_pc += sizeof(struct logical_op);
- }
- PO;
- }
- OP(FILTER_OP_OR):
- {
- struct logical_op *insn = (struct logical_op *) pc;
-
- /* If AX is nonzero, skip and evaluate to 1 */
-
- if (unlikely(estack_ax_v != 0)) {
- estack_ax_v = 1;
- dbg_printk("Jumping to bytecode offset %u\n",
- (unsigned int) insn->skip_offset);
- next_pc = start_pc + insn->skip_offset;
- } else {
- /* Pop 1 when jump not taken */
- estack_pop(stack, top, ax, bx);
- next_pc += sizeof(struct logical_op);
- }
- PO;
- }
-
-
- /* load field ref */
- OP(FILTER_OP_LOAD_FIELD_REF_STRING):
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- dbg_printk("load field ref offset %u type string\n",
- ref->offset);
- estack_push(stack, top, ax, bx);
- estack_ax(stack, top)->u.s.str =
- *(const char * const *) &filter_stack_data[ref->offset];
- if (unlikely(!estack_ax(stack, top)->u.s.str)) {
- dbg_printk("Filter warning: loading a NULL string.\n");
- ret = -EINVAL;
- goto end;
- }
- estack_ax(stack, top)->u.s.seq_len = UINT_MAX;
- estack_ax(stack, top)->u.s.literal = 0;
- estack_ax(stack, top)->u.s.user = 0;
- dbg_printk("ref load string %s\n", estack_ax(stack, top)->u.s.str);
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- PO;
- }
-
- OP(FILTER_OP_LOAD_FIELD_REF_SEQUENCE):
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- dbg_printk("load field ref offset %u type sequence\n",
- ref->offset);
- estack_push(stack, top, ax, bx);
- estack_ax(stack, top)->u.s.seq_len =
- *(unsigned long *) &filter_stack_data[ref->offset];
- estack_ax(stack, top)->u.s.str =
- *(const char **) (&filter_stack_data[ref->offset
- + sizeof(unsigned long)]);
- if (unlikely(!estack_ax(stack, top)->u.s.str)) {
- dbg_printk("Filter warning: loading a NULL sequence.\n");
- ret = -EINVAL;
- goto end;
- }
- estack_ax(stack, top)->u.s.literal = 0;
- estack_ax(stack, top)->u.s.user = 0;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- PO;
- }
-
- OP(FILTER_OP_LOAD_FIELD_REF_S64):
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- dbg_printk("load field ref offset %u type s64\n",
- ref->offset);
- estack_push(stack, top, ax, bx);
- estack_ax_v =
- ((struct literal_numeric *) &filter_stack_data[ref->offset])->v;
- dbg_printk("ref load s64 %lld\n",
- (long long) estack_ax_v);
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- PO;
- }
-
- OP(FILTER_OP_LOAD_FIELD_REF_DOUBLE):
- {
- BUG_ON(1);
- PO;
- }
-
- /* load from immediate operand */
- OP(FILTER_OP_LOAD_STRING):
- {
- struct load_op *insn = (struct load_op *) pc;
-
- dbg_printk("load string %s\n", insn->data);
- estack_push(stack, top, ax, bx);
- estack_ax(stack, top)->u.s.str = insn->data;
- estack_ax(stack, top)->u.s.seq_len = UINT_MAX;
- estack_ax(stack, top)->u.s.literal = 1;
- estack_ax(stack, top)->u.s.user = 0;
- next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
- PO;
- }
-
- OP(FILTER_OP_LOAD_S64):
- {
- struct load_op *insn = (struct load_op *) pc;
-
- estack_push(stack, top, ax, bx);
- estack_ax_v = ((struct literal_numeric *) insn->data)->v;
- dbg_printk("load s64 %lld\n",
- (long long) estack_ax_v);
- next_pc += sizeof(struct load_op)
- + sizeof(struct literal_numeric);
- PO;
- }
-
- OP(FILTER_OP_LOAD_DOUBLE):
- {
- BUG_ON(1);
- PO;
- }
-
- /* cast */
- OP(FILTER_OP_CAST_TO_S64):
- printk(KERN_WARNING "unsupported non-specialized bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- OP(FILTER_OP_CAST_DOUBLE_TO_S64):
- {
- BUG_ON(1);
- PO;
- }
-
- OP(FILTER_OP_CAST_NOP):
- {
- next_pc += sizeof(struct cast_op);
- PO;
- }
-
- /* get context ref */
- OP(FILTER_OP_GET_CONTEXT_REF_STRING):
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
- struct lttng_ctx_field *ctx_field;
- union lttng_ctx_value v;
-
- dbg_printk("get context ref offset %u type string\n",
- ref->offset);
- ctx_field = <tng_static_ctx->fields[ref->offset];
- ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
- estack_push(stack, top, ax, bx);
- estack_ax(stack, top)->u.s.str = v.str;
- if (unlikely(!estack_ax(stack, top)->u.s.str)) {
- dbg_printk("Filter warning: loading a NULL string.\n");
- ret = -EINVAL;
- goto end;
- }
- estack_ax(stack, top)->u.s.seq_len = UINT_MAX;
- estack_ax(stack, top)->u.s.literal = 0;
- estack_ax(stack, top)->u.s.user = 0;
- dbg_printk("ref get context string %s\n", estack_ax(stack, top)->u.s.str);
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- PO;
- }
-
- OP(FILTER_OP_GET_CONTEXT_REF_S64):
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
- struct lttng_ctx_field *ctx_field;
- union lttng_ctx_value v;
-
- dbg_printk("get context ref offset %u type s64\n",
- ref->offset);
- ctx_field = <tng_static_ctx->fields[ref->offset];
- ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
- estack_push(stack, top, ax, bx);
- estack_ax_v = v.s64;
- dbg_printk("ref get context s64 %lld\n",
- (long long) estack_ax_v);
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- PO;
- }
-
- OP(FILTER_OP_GET_CONTEXT_REF_DOUBLE):
- {
- BUG_ON(1);
- PO;
- }
-
- /* load userspace field ref */
- OP(FILTER_OP_LOAD_FIELD_REF_USER_STRING):
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- dbg_printk("load field ref offset %u type user string\n",
- ref->offset);
- estack_push(stack, top, ax, bx);
- estack_ax(stack, top)->u.s.str =
- *(const char * const *) &filter_stack_data[ref->offset];
- if (unlikely(!estack_ax(stack, top)->u.s.str)) {
- dbg_printk("Filter warning: loading a NULL string.\n");
- ret = -EINVAL;
- goto end;
- }
- estack_ax(stack, top)->u.s.seq_len = UINT_MAX;
- estack_ax(stack, top)->u.s.literal = 0;
- estack_ax(stack, top)->u.s.user = 1;
- dbg_printk("ref load string %s\n", estack_ax(stack, top)->u.s.str);
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- PO;
- }
-
- OP(FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE):
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- dbg_printk("load field ref offset %u type user sequence\n",
- ref->offset);
- estack_push(stack, top, ax, bx);
- estack_ax(stack, top)->u.s.seq_len =
- *(unsigned long *) &filter_stack_data[ref->offset];
- estack_ax(stack, top)->u.s.str =
- *(const char **) (&filter_stack_data[ref->offset
- + sizeof(unsigned long)]);
- if (unlikely(!estack_ax(stack, top)->u.s.str)) {
- dbg_printk("Filter warning: loading a NULL sequence.\n");
- ret = -EINVAL;
- goto end;
- }
- estack_ax(stack, top)->u.s.literal = 0;
- estack_ax(stack, top)->u.s.user = 1;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- PO;
- }
-
- END_OP
-end:
- /* return 0 (discard) on error */
- if (ret)
- return 0;
- return retval;
-}
-
-#undef START_OP
-#undef OP
-#undef PO
-#undef END_OP
projects / lttng-modules.git / blobdiff