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objtool: Implement stack validation 2.0

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This is a major rewrite of objtool.  Instead of only tracking frame
pointer changes, it now tracks all stack-related operations, including
all register saves/restores.

In addition to making stack validation more robust, this also paves the
way for undwarf generation.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: live-patching@vger.kernel.org
Link: http://lkml.kernel.org/r/678bd94c0566c6129bcc376cddb259c4c5633004.1498659915.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Josh Poimboeuf
2017-06-28 10:11:07 -05:00
committed by Ingo Molnar
parent c207aee480
commit baa41469a7
11 changed files with 1133 additions and 323 deletions
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64
tools/objtool/arch.h
View File

@@ -19,25 +19,63 @@
#define _ARCH_H
#include <stdbool.h>
#include <linux/list.h>
#include "elf.h"
#include "cfi.h"
#define INSN_FP_SAVE 1
#define INSN_FP_SETUP 2
#define INSN_FP_RESTORE 3
#define INSN_JUMP_CONDITIONAL 4
#define INSN_JUMP_UNCONDITIONAL 5
#define INSN_JUMP_DYNAMIC 6
#define INSN_CALL 7
#define INSN_CALL_DYNAMIC 8
#define INSN_RETURN 9
#define INSN_CONTEXT_SWITCH 10
#define INSN_NOP 11
#define INSN_OTHER 12
#define INSN_JUMP_CONDITIONAL 1
#define INSN_JUMP_UNCONDITIONAL 2
#define INSN_JUMP_DYNAMIC 3
#define INSN_CALL 4
#define INSN_CALL_DYNAMIC 5
#define INSN_RETURN 6
#define INSN_CONTEXT_SWITCH 7
#define INSN_STACK 8
#define INSN_NOP 9
#define INSN_OTHER 10
#define INSN_LAST INSN_OTHER
enum op_dest_type {
OP_DEST_REG,
OP_DEST_REG_INDIRECT,
OP_DEST_MEM,
OP_DEST_PUSH,
OP_DEST_LEAVE,
};
struct op_dest {
enum op_dest_type type;
unsigned char reg;
int offset;
};
enum op_src_type {
OP_SRC_REG,
OP_SRC_REG_INDIRECT,
OP_SRC_CONST,
OP_SRC_POP,
OP_SRC_ADD,
OP_SRC_AND,
};
struct op_src {
enum op_src_type type;
unsigned char reg;
int offset;
};
struct stack_op {
struct op_dest dest;
struct op_src src;
};
void arch_initial_func_cfi_state(struct cfi_state *state);
int arch_decode_instruction(struct elf *elf, struct section *sec,
unsigned long offset, unsigned int maxlen,
unsigned int *len, unsigned char *type,
unsigned long *displacement);
unsigned long *immediate, struct stack_op *op);
bool arch_callee_saved_reg(unsigned char reg);
#endif /* _ARCH_H */