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/*
* Copyright (c) 2013-2018 The strace developers.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#ifndef STRACE_MMAP_CACHE_H
# define STRACE_MMAP_CACHE_H
/*
* Keep a sorted array of cache entries,
* so that we can binary search through it.
*/
struct mmap_cache_t {
struct mmap_cache_entry_t *entry;
void (*free_fn)(struct tcb *, const char *caller);
unsigned int size;
unsigned int generation;
};
struct mmap_cache_entry_t {
/**
* example entry:
* 7fabbb09b000-7fabbb09f000 r-xp 00179000 fc:00 1180246 /lib/libc-2.11.1.so
*
* start_addr is 0x7fabbb09b000
* end_addr is 0x7fabbb09f000
* mmap_offset is 0x179000
* protections is MMAP_CACHE_PROT_READABLE|MMAP_CACHE_PROT_EXECUTABLE
* major is 0xfc
* minor is 0x00
* binary_filename is "/lib/libc-2.11.1.so"
*/
unsigned long start_addr;
unsigned long end_addr;
unsigned long mmap_offset;
unsigned char protections;
unsigned long major, minor;
char *binary_filename;
};
enum mmap_cache_protection {
MMAP_CACHE_PROT_READABLE = 1 << 0,
MMAP_CACHE_PROT_WRITABLE = 1 << 1,
MMAP_CACHE_PROT_EXECUTABLE = 1 << 2,
MMAP_CACHE_PROT_SHARED = 1 << 3,
};
enum mmap_cache_rebuild_result {
MMAP_CACHE_REBUILD_NOCACHE,
MMAP_CACHE_REBUILD_READY,
MMAP_CACHE_REBUILD_RENEWED,
};
typedef bool (*mmap_cache_search_fn)(struct mmap_cache_entry_t *, void *);
extern void
mmap_cache_enable(void);
extern enum mmap_cache_rebuild_result
mmap_cache_rebuild_if_invalid(struct tcb *, const char *caller);
extern struct mmap_cache_entry_t *
mmap_cache_search(struct tcb *, unsigned long ip);
extern struct mmap_cache_entry_t *
mmap_cache_search_custom(struct tcb *, mmap_cache_search_fn, void *);
#endif /* !STRACE_MMAP_CACHE_H */
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