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insn_print.c
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insn_print.c
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#include "common.h"
static char *print_buf;
static size_t print_buflen;
static size_t print_bufidx;
#define PRINT_TAIL(buf, IDX, cnt) \
({\
if (print_bufidx + strlen(buf) > print_buflen)\
return -1;\
memcpy(print_buf + print_bufidx, buf, strlen(buf));\
print_bufidx += strlen(buf);\
*idx = IDX + cnt;\
return 0;\
})
/* BPF_MOV64_REG */
static int do_mov64_reg_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_MOV64_REG";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s),\n", i,
bpf_reg_str[_insn0.dst_reg],
bpf_reg_str[_insn0.src_reg]);
PRINT_TAIL(buf, _idx, 1);
}
static int do_mov64_imm_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_MOV64_IMM";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, 0x%x),\n", i,
bpf_reg_str[_insn0.dst_reg],
_insn0.imm);
PRINT_TAIL(buf, _idx, 1);
}
static int do_alu64_reg_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_ALU64_REG";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, %s),\n", i,
bpf_alu_op_str[BPF_OP(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
bpf_reg_str[_insn0.src_reg]);
PRINT_TAIL(buf, _idx, 1);
}
static int do_alu64_imm_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_ALU64_IMM";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, 0x%x),\n", i,
bpf_alu_op_str[BPF_OP(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
_insn0.imm);
PRINT_TAIL(buf, _idx, 1);
}
static int do_alu64_print(struct bpf_insn *insn, size_t cnt, size_t *idx)
{
u8 code = insn[*idx].code;
if (BPF_OP(code) == BPF_MOV) {
if (BPF_SRC(code) == BPF_X) {
return do_mov64_reg_print(insn, cnt, idx);
} else if (BPF_SRC(code) == BPF_K) {
return do_mov64_imm_print(insn, cnt, idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
return -1;
}
} else if (BPF_SRC(code) == BPF_X) {
return do_alu64_reg_print(insn, cnt, idx);
} else if (BPF_SRC(code) == BPF_K) {
return do_alu64_imm_print(insn, cnt, idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
return -1;
}
}
static int do_end_print(struct bpf_insn *insn, size_t cnt, size_t *idx)
{
char buf[0x100];
char *i = "BPF_ENDIAN";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, 0x%x),\n", i,
bpf_alu_op_str[BPF_SRC(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
_insn0.imm);
PRINT_TAIL(buf, _idx, 1);
}
static int do_mov32_reg_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_MOV32_REG";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s),\n", i,
bpf_reg_str[_insn0.dst_reg],
bpf_reg_str[_insn0.src_reg]);
PRINT_TAIL(buf, _idx, 1);
}
static int do_mov32_imm_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_MOV32_IMM";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, 0x%x),\n", i,
bpf_reg_str[_insn0.dst_reg],
_insn0.imm);
PRINT_TAIL(buf, _idx, 1);
}
static int do_alu32_reg_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_ALU32_REG";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, %s),\n", i,
bpf_alu_op_str[BPF_OP(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
bpf_reg_str[_insn0.src_reg]);
PRINT_TAIL(buf, _idx, 1);
}
static int do_alu32_imm_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_ALU32_IMM";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, 0x%x),\n", i,
bpf_alu_op_str[BPF_OP(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
_insn0.imm);
PRINT_TAIL(buf, _idx, 1);
}
static int do_alu32_print(struct bpf_insn *insn, size_t cnt, size_t *idx)
{
u8 code = insn[*idx].code;
if (BPF_OP(code) == BPF_END) {
return do_end_print(insn, cnt, idx);
} else if (BPF_OP(code) == BPF_MOV) {
if (BPF_SRC(code) == BPF_X) {
return do_mov32_reg_print(insn, cnt, idx);
} else if (BPF_SRC(code) == BPF_K) {
return do_mov32_imm_print(insn, cnt, idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
return -1;
}
} else if (BPF_SRC(code) == BPF_X) {
return do_alu32_reg_print(insn, cnt, idx);
} else if (BPF_SRC(code) == BPF_K) {
return do_alu32_imm_print(insn, cnt, idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
return -1;
}
}
static int do_ld_map_fd_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
/* XXX: no check */
char buf[0x100];
char *i = "BPF_LD_MAP_FD";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
struct bpf_insn _insn1 = insn[_idx+1];
snprintf(buf, 0x100, "%s(%s, 0x%llx),\n", i,
bpf_reg_str[_insn0.dst_reg],
(u64)_insn1.imm | (u64)_insn0.imm);
PRINT_TAIL(buf, _idx, 2);
}
static int do_ld_imm64_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_LD_IMM64";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
struct bpf_insn _insn1 = insn[_idx+1];
snprintf(buf, 0x100, "%s(%s, 0x%llx),\n", i,
bpf_reg_str[_insn0.dst_reg],
(((u64)_insn1.imm) << 32) | (u64)_insn0.imm);
PRINT_TAIL(buf, _idx, 2);
}
static int do_ld_imm64_raw_print(struct bpf_insn *insn,
size_t cnt, size_t *idx)
{
if (insn[*idx].src_reg == BPF_PSEUDO_MAP_FD) {
return do_ld_map_fd_print(insn, cnt, idx);
} else if (insn[*idx].src_reg == 0) {
return do_ld_imm64_print(insn, cnt, idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
return -1;
}
}
static int do_ld_abs_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_LD_ABS";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, 0x%x),\n", i,
bpf_size_str[BPF_SIZE(_insn0.code)],
_insn0.imm);
PRINT_TAIL(buf, _idx, 1);
}
static int do_ld_ind_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_LD_IND";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, 0x%x),\n", i,
bpf_size_str[BPF_SIZE(_insn0.code)],
bpf_reg_str[_insn0.src_reg],
_insn0.imm);
PRINT_TAIL(buf, _idx, 1);
}
static int do_ld_print(struct bpf_insn *insn, size_t cnt, size_t *idx)
{
u8 code = insn[*idx].code;
if ((BPF_SIZE(code) == BPF_DW) && (BPF_MODE(code) == BPF_IMM)) {
return do_ld_imm64_raw_print(insn, cnt, idx);
} else if (BPF_MODE(code) == BPF_ABS) {
return do_ld_abs_print(insn, cnt, idx);
} else if (BPF_MODE(code) == BPF_IND) {
return do_ld_ind_print(insn, cnt, idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
return -1;
}
}
static int do_ldx_mem_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_LDX_MEM";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, %s, %hd),\n", i,
bpf_size_str[BPF_SIZE(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
bpf_reg_str[_insn0.src_reg],
_insn0.off);
PRINT_TAIL(buf, _idx, 1);
}
static int do_ldx_print(struct bpf_insn *insn, size_t cnt, size_t *idx)
{
u8 code = insn[*idx].code;
if (BPF_MODE(code) == BPF_MEM) {
return do_ldx_mem_print(insn, cnt, idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
return -1;
}
}
static int do_stx_mem_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_STX_MEM";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, %s, %hd),\n", i,
bpf_size_str[BPF_SIZE(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
bpf_reg_str[_insn0.src_reg],
_insn0.off);
PRINT_TAIL(buf, _idx, 1);
}
static int do_stx_xadd_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_STX_XADD";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, %s, %hd),\n", i,
bpf_size_str[BPF_SIZE(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
bpf_reg_str[_insn0.src_reg],
_insn0.off);
PRINT_TAIL(buf, _idx, 1);
}
static int do_stx_print(struct bpf_insn *insn, size_t cnt, size_t *idx)
{
u8 code = insn[*idx].code;
if (BPF_MODE(code) == BPF_MEM) {
return do_stx_mem_print(insn, cnt, idx);
} else if (BPF_MODE(code) == BPF_XADD) {
return do_stx_xadd_print(insn, cnt, idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
return -1;
}
}
static int do_st_mem_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_ST_MEM";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, %hd, 0x%x),\n", i,
bpf_size_str[BPF_SIZE(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
_insn0.off,
_insn0.imm);
PRINT_TAIL(buf, _idx, 1);
}
static int do_st_print(struct bpf_insn *insn, size_t cnt, size_t *idx)
{
u8 code = insn[*idx].code;
if (BPF_MODE(code) == BPF_MEM) {
return do_st_mem_print(insn, cnt, idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
return -1;
}
}
static int do_jmp_reg_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_JMP_REG";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, %s, %hd),\n", i,
bpf_jmp_op_str[BPF_OP(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
bpf_reg_str[_insn0.src_reg],
_insn0.off);
PRINT_TAIL(buf, _idx, 1);
}
static int do_jmp_imm_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_JMP_IMM";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, 0x%x, %hd),\n", i,
bpf_jmp_op_str[BPF_OP(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
_insn0.imm,
_insn0.off);
PRINT_TAIL(buf, _idx, 1);
}
static int do_jmp_a_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_JMP_A";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%hd),\n", i,
_insn0.off);
PRINT_TAIL(buf, _idx, 1);
}
static int do_call_rel_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_CALL_REL";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(0x%x),\n", i,
_insn0.imm);
PRINT_TAIL(buf, _idx, 1);
}
static int do_emit_call_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_EMIT_CALL";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(0x%x),\n", i,
_insn0.imm);
PRINT_TAIL(buf, _idx, 1);
}
static int do_call_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
if (insn[*idx].src_reg == BPF_PSEUDO_CALL) {
return do_call_rel_print(insn, cnt, idx);
} else if (insn[*idx].src_reg == 0) {
return do_emit_call_print(insn, cnt, idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
return -1;
}
}
static int do_exit_print(struct bpf_insn *insn, size_t cnt, size_t *idx)
{
char buf[0x100];
char *i = "BPF_EXIT_INSN";
size_t _idx = *idx;
snprintf(buf, 0x100, "%s(),\n", i);
PRINT_TAIL(buf, _idx, 1);
}
static int do_jmp64_print(struct bpf_insn *insn, size_t cnt, size_t *idx)
{
u8 code = insn[*idx].code;
if (BPF_OP(code) == BPF_CALL) {
return do_call_print(insn, cnt, idx);
} else if (BPF_OP(code) == BPF_EXIT) {
return do_exit_print(insn, cnt, idx);
} else if (BPF_SRC(code) == BPF_X) {
return do_jmp_reg_print(insn, cnt, idx);
} else if (BPF_SRC(code) == BPF_K) {
return do_jmp_imm_print(insn, cnt, idx);
} else if (BPF_OP(code) == BPF_JA) {
return do_jmp_a_print(insn, cnt, idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
return -1;
}
}
static int do_jmp32_reg_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_JMP32_REG";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, %s, %hd),\n", i,
bpf_jmp_op_str[BPF_OP(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
bpf_reg_str[_insn0.src_reg],
_insn0.off);
PRINT_TAIL(buf, _idx, 1);
}
static int do_jmp32_imm_print(struct bpf_insn *insn, size_t cnt,
size_t *idx)
{
char buf[0x100];
char *i = "BPF_JMP32_IMM";
size_t _idx = *idx;
struct bpf_insn _insn0 = insn[_idx];
snprintf(buf, 0x100, "%s(%s, %s, 0x%x, %hd),\n", i,
bpf_jmp_op_str[BPF_OP(_insn0.code)],
bpf_reg_str[_insn0.dst_reg],
_insn0.imm,
_insn0.off);
PRINT_TAIL(buf, _idx, 1);
}
static int do_jmp32_print(struct bpf_insn *insn, size_t cnt, size_t *idx)
{
u8 code = insn[*idx].code;
if (BPF_SRC(code) == BPF_X) {
return do_jmp32_reg_print(insn, cnt, idx);
} else if (BPF_SRC(code) == BPF_K) {
return do_jmp32_imm_print(insn, cnt, idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
return -1;
}
}
static int do_insn_print(struct bpf_insn *insn, size_t cnt)
{
size_t idx = 0;
int err = 0;
u8 code;
while (idx < cnt) {
code = insn[idx].code;
if (BPF_CLASS(code) == BPF_ALU64) {
err = do_alu64_print(insn, cnt, &idx);
} else if (BPF_CLASS(code) == BPF_ALU) {
err = do_alu32_print(insn, cnt, &idx);
} else if (BPF_CLASS(code) == BPF_LD) {
err = do_ld_print(insn, cnt, &idx);
} else if (BPF_CLASS(code) == BPF_LDX) {
err = do_ldx_print(insn, cnt, &idx);
} else if (BPF_CLASS(code) == BPF_STX) {
err = do_stx_print(insn, cnt, &idx);
} else if (BPF_CLASS(code) == BPF_ST) {
err = do_st_print(insn, cnt, &idx);
} else if (BPF_CLASS(code) == BPF_JMP) {
err = do_jmp64_print(insn, cnt, &idx);
} else if (BPF_CLASS(code) == BPF_JMP32) {
err = do_jmp32_print(insn, cnt, &idx);
} else {
fprintf(stderr, "%d\n", __LINE__);
err = -1;
}
if (err == -1)
break;
}
return err;
}
int insn_print_common(char *buf, size_t buflen, struct bpf_insn *insn,
size_t cnt)
{
/* choose the right handler to print the insn */
print_buf = buf;
print_buflen = buflen;
print_bufidx = 0;
return do_insn_print(insn, cnt);
}