bpf-prologue.c File Reference

#include <bpf/libbpf.h>
#include "perf.h"
#include "debug.h"
#include "bpf-loader.h"
#include "bpf-prologue.h"
#include "probe-finder.h"
#include <errno.h>
#include <dwarf-regs.h>
#include <linux/filter.h>

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Classes
struct	bpf_insn_pos

Macros
#define	BPF_REG_SIZE   8
#define	JMP_TO_ERROR_CODE   -1
#define	JMP_TO_SUCCESS_CODE   -2
#define	JMP_TO_USER_CODE   -3
#define	ins(i, p)   append_insn((i), (p))

Functions
static int	pos_get_cnt (struct bpf_insn_pos *pos)
static int	append_insn (struct bpf_insn new_insn, struct bpf_insn_pos *pos)
static int	check_pos (struct bpf_insn_pos *pos)
static int	argtype_to_ldx_size (const char *type)
static const char *	insn_sz_to_str (int insn_sz)
static int	gen_ldx_reg_from_ctx (struct bpf_insn_pos *pos, int ctx_reg, const char *reg, int target_reg)
static int	gen_read_mem (struct bpf_insn_pos *pos, int src_base_addr_reg, int dst_addr_reg, long offset)
static int	gen_prologue_fastpath (struct bpf_insn_pos *pos, struct probe_trace_arg *args, int nargs)
static int	gen_prologue_slowpath (struct bpf_insn_pos *pos, struct probe_trace_arg *args, int nargs)
static int	prologue_relocate (struct bpf_insn_pos *pos, struct bpf_insn *error_code, struct bpf_insn *success_code, struct bpf_insn *user_code)
int	bpf__gen_prologue (struct probe_trace_arg *args, int nargs, struct bpf_insn *new_prog, size_t *new_cnt, size_t cnt_space)

Macro Definition Documentation

BPF_REG_SIZE

#define BPF_REG_SIZE   8

Definition at line 20 of file bpf-prologue.c.

ins

#define ins	(		i,
			p
	)		append_insn((i), (p))

Definition at line 103 of file bpf-prologue.c.

JMP_TO_ERROR_CODE

#define JMP_TO_ERROR_CODE   -1

Definition at line 22 of file bpf-prologue.c.

JMP_TO_SUCCESS_CODE

#define JMP_TO_SUCCESS_CODE   -2

Definition at line 23 of file bpf-prologue.c.

JMP_TO_USER_CODE

#define JMP_TO_USER_CODE   -3

Definition at line 24 of file bpf-prologue.c.

Function Documentation

append_insn()

static int append_insn ( struct bpf_insn  new_insn, struct bpf_insn_pos *  pos  )

static

Definition at line 39 of file bpf-prologue.c.

argtype_to_ldx_size()

static int argtype_to_ldx_size ( const char *  type )

static

Definition at line 68 of file bpf-prologue.c.

bpf__gen_prologue()

int bpf__gen_prologue	(	struct probe_trace_arg *	args,
		int	nargs,
		struct bpf_insn *	new_prog,
		size_t *	new_cnt,
		size_t	cnt_space
	)

Definition at line 358 of file bpf-prologue.c.

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check_pos()

static int check_pos ( struct bpf_insn_pos *  pos )

static

Definition at line 55 of file bpf-prologue.c.

gen_ldx_reg_from_ctx()

static int gen_ldx_reg_from_ctx ( struct bpf_insn_pos *  pos, int  ctx_reg, const char *  reg, int  target_reg  )

static

Definition at line 112 of file bpf-prologue.c.

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gen_prologue_fastpath()

static int gen_prologue_fastpath ( struct bpf_insn_pos *  pos, struct probe_trace_arg *  args, int  nargs  )

static

Definition at line 182 of file bpf-prologue.c.

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gen_prologue_slowpath()

static int gen_prologue_slowpath ( struct bpf_insn_pos *  pos, struct probe_trace_arg *  args, int  nargs  )

static

Definition at line 241 of file bpf-prologue.c.

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gen_read_mem()

static int gen_read_mem ( struct bpf_insn_pos *  pos, int  src_base_addr_reg, int  dst_addr_reg, long  offset  )

static

Definition at line 142 of file bpf-prologue.c.

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insn_sz_to_str()

static const char* insn_sz_to_str ( int  insn_sz )

static

Definition at line 86 of file bpf-prologue.c.

pos_get_cnt()

static int pos_get_cnt ( struct bpf_insn_pos *  pos )

inlinestatic

Definition at line 33 of file bpf-prologue.c.

prologue_relocate()

static int prologue_relocate ( struct bpf_insn_pos *  pos, struct bpf_insn *  error_code, struct bpf_insn *  success_code, struct bpf_insn *  user_code  )

static

Definition at line 319 of file bpf-prologue.c.

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