mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 02:23:16 +00:00
b5bc2231b8
David requested a objtool validation pass for CONFIG_RETPOLINE=y enabled builds, where it validates no unannotated indirect jumps or calls are left. Add an additional .discard.retpoline_safe section to allow annotating the few indirect sites that are required and safe. Requested-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: David Woodhouse <dwmw@amazon.co.uk> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org>
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/*
|
|
* Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
|
|
*
|
|
* 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;
|
|
bool retpoline_safe;
|
|
struct symbol *call_dest;
|
|
struct instruction *jump_dest;
|
|
struct instruction *first_jump_src;
|
|
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 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 */
|