mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 05:50:53 +07:00
7631376b2d
[ Upstream commit 1f9a1b74942485a0a29e7c4a9a9f2fe8aea17766 ]
The JMP_NOSPEC macro branches to __x86_retpoline_*() rather than the
__x86_indirect_thunk_*() wrappers used by C code. Detect jumps to
__x86_retpoline_*() as retpoline dynamic jumps.
Presumably this doesn't trigger a user-visible bug. I only found it
when testing vmlinux.o validation.
Fixes: 39b735332c ("objtool: Detect jumps to retpoline thunks")
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/31f5833e2e4f01e3d755889ac77e3661e906c09f.1611263461.git.jpoimboe@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
|
|
*/
|
|
|
|
#ifndef _CHECK_H
|
|
#define _CHECK_H
|
|
|
|
#include <stdbool.h>
|
|
#include "cfi.h"
|
|
#include "arch.h"
|
|
|
|
struct insn_state {
|
|
struct cfi_state cfi;
|
|
unsigned int uaccess_stack;
|
|
bool uaccess;
|
|
bool df;
|
|
bool noinstr;
|
|
s8 instr;
|
|
};
|
|
|
|
struct instruction {
|
|
struct list_head list;
|
|
struct hlist_node hash;
|
|
struct list_head static_call_node;
|
|
struct section *sec;
|
|
unsigned long offset;
|
|
unsigned int len;
|
|
enum insn_type type;
|
|
unsigned long immediate;
|
|
bool dead_end, ignore, ignore_alts;
|
|
bool hint;
|
|
bool retpoline_safe;
|
|
s8 instr;
|
|
u8 visited;
|
|
u8 ret_offset;
|
|
int alt_group;
|
|
struct symbol *call_dest;
|
|
struct instruction *jump_dest;
|
|
struct instruction *first_jump_src;
|
|
struct reloc *jump_table;
|
|
struct list_head alts;
|
|
struct symbol *func;
|
|
struct list_head stack_ops;
|
|
struct cfi_state cfi;
|
|
#ifdef INSN_USE_ORC
|
|
struct orc_entry orc;
|
|
#endif
|
|
};
|
|
|
|
static inline bool is_static_jump(struct instruction *insn)
|
|
{
|
|
return insn->type == INSN_JUMP_CONDITIONAL ||
|
|
insn->type == INSN_JUMP_UNCONDITIONAL;
|
|
}
|
|
|
|
static inline bool is_dynamic_jump(struct instruction *insn)
|
|
{
|
|
return insn->type == INSN_JUMP_DYNAMIC ||
|
|
insn->type == INSN_JUMP_DYNAMIC_CONDITIONAL;
|
|
}
|
|
|
|
static inline bool is_jump(struct instruction *insn)
|
|
{
|
|
return is_static_jump(insn) || is_dynamic_jump(insn);
|
|
}
|
|
|
|
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 */
|