mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-10 19:39:54 +01:00
Josh Poimboeuf
258c76059c
Getting objtool to understand retpolines is going to be a bit of a challenge. For now, take advantage of the fact that retpolines are patched in with alternatives. Just read the original (sane) non-alternative instruction, and ignore the patched-in retpoline. This allows objtool to understand the control flow *around* the retpoline, even if it can't yet follow what's inside. This means the ORC unwinder will fail to unwind from inside a retpoline, but will work fine otherwise. Signed-off-by: Josh Poimboeuf <[email protected]> Signed-off-by: David Woodhouse <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Cc: [email protected] Cc: Rik van Riel <[email protected]> Cc: Andi Kleen <[email protected]> Cc: [email protected] Cc: Peter Zijlstra <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Jiri Kosina <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Kees Cook <[email protected]> Cc: Tim Chen <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Paul Turner <[email protected]> Link: https://lkml.kernel.org/r/[email protected]
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/*
|
|
* Copyright (C) 2017 Josh Poimboeuf <[email protected]>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef _CHECK_H
|
|
#define _CHECK_H
|
|
|
|
#include <stdbool.h>
|
|
#include "elf.h"
|
|
#include "cfi.h"
|
|
#include "arch.h"
|
|
#include "orc.h"
|
|
#include <linux/hashtable.h>
|
|
|
|
struct insn_state {
|
|
struct cfi_reg cfa;
|
|
struct cfi_reg regs[CFI_NUM_REGS];
|
|
int stack_size;
|
|
unsigned char type;
|
|
bool bp_scratch;
|
|
bool drap;
|
|
int drap_reg, drap_offset;
|
|
struct cfi_reg vals[CFI_NUM_REGS];
|
|
};
|
|
|
|
struct instruction {
|
|
struct list_head list;
|
|
struct hlist_node hash;
|
|
struct section *sec;
|
|
unsigned long offset;
|
|
unsigned int len;
|
|
unsigned char type;
|
|
unsigned long immediate;
|
|
bool alt_group, visited, dead_end, ignore, hint, save, restore, ignore_alts;
|
|
struct symbol *call_dest;
|
|
struct instruction *jump_dest;
|
|
struct list_head alts;
|
|
struct symbol *func;
|
|
struct stack_op stack_op;
|
|
struct insn_state state;
|
|
struct orc_entry orc;
|
|
};
|
|
|
|
struct objtool_file {
|
|
struct elf *elf;
|
|
struct list_head insn_list;
|
|
DECLARE_HASHTABLE(insn_hash, 16);
|
|
struct section *rodata, *whitelist;
|
|
bool ignore_unreachables, c_file, hints;
|
|
};
|
|
|
|
int check(const char *objname, bool no_fp, bool no_unreachable, bool orc);
|
|
|
|
struct instruction *find_insn(struct objtool_file *file,
|
|
struct section *sec, unsigned long offset);
|
|
|
|
#define for_each_insn(file, insn) \
|
|
list_for_each_entry(insn, &file->insn_list, list)
|
|
|
|
#define sec_for_each_insn(file, sec, insn) \
|
|
for (insn = find_insn(file, sec, 0); \
|
|
insn && &insn->list != &file->insn_list && \
|
|
insn->sec == sec; \
|
|
insn = list_next_entry(insn, list))
|
|
|
|
|
|
#endif /* _CHECK_H */
|