mirror of
https://github.com/netdata/libbpf.git
synced 2026-03-13 21:09:07 +08:00
add a simple Makefile to build and clean up
add missing macros, static inline functions, etc. add README to illustrate the purpose of this repo. Signed-off-by: Yonghong Song <yhs@fb.com>
This commit is contained in:
Yonghong Song
21
README
Normal file
21
README
Normal file
@@ -0,0 +1,21 @@
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This is a mirror of bpf-next linux tree
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(https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next)
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bpf-next/tools/lib/bpf directory plus its supporting header files.
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The following files will by sync'ed with bpf-next repo:
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src/ <-> bpf-next/tools/lib/bpf/
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include/uapi/linux/{bpf.h,btf.h} <-> bpf-next/tools/include/uapi/linux/{bpf.h,btf.h}
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include/tools/libc_compat.h <-> bpf-next/tools/include/tools/libc_compat.h
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Other header files at this repo (include/linux/*.h) are reduced versions of
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their counterpart files at bpf-next/tools/include/linux/*.h to make compilation
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successful.
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Build
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=====
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To build,
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cd src
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make
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and it will build libbpf.a library
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@@ -3,9 +3,30 @@
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#ifndef __LINUX_ERR_H
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#define __LINUX_ERR_H
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#include <linux/types.h>
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#define MAX_ERRNO 4095
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#define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO)
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static inline void * ERR_PTR(long error_)
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{
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return (void *) error_;
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}
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static inline long PTR_ERR(const void *ptr)
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{
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return (long) ptr;
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}
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static inline bool IS_ERR(const void *ptr)
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{
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return IS_ERR_VALUE((unsigned long)ptr);
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}
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static inline bool IS_ERR_OR_NULL(const void *ptr)
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{
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return (!ptr) || IS_ERR_VALUE((unsigned long)ptr);
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}
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#endif
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@@ -3,10 +3,41 @@
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#ifndef __LINUX_KERNEL_H
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#define __LINUX_KERNEL_H
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#ifndef offsetof
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#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
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#endif
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#ifndef container_of
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#define container_of(ptr, type, member) ({ \
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const typeof(((type *)0)->member) * __mptr = (ptr); \
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(type *)((char *)__mptr - offsetof(type, member)); })
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#endif
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#ifndef max
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#define max(x, y) ({ \
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typeof(x) _max1 = (x); \
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typeof(y) _max2 = (y); \
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(void) (&_max1 == &_max2); \
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_max1 > _max2 ? _max1 : _max2; })
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#endif
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#ifndef min
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#define min(x, y) ({ \
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typeof(x) _min1 = (x); \
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typeof(y) _min2 = (y); \
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(void) (&_min1 == &_min2); \
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_min1 < _min2 ? _min1 : _min2; })
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#endif
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#ifndef roundup
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#define roundup(x, y) ( \
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{ \
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const typeof(y) __y = y; \
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(((x) + (__y - 1)) / __y) * __y; \
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} \
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)
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#endif
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
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#endif
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@@ -7,6 +7,71 @@
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#define LIST_HEAD(name) \
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struct list_head name = LIST_HEAD_INIT(name)
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#define POISON_POINTER_DELTA 0
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#define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA)
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#define LIST_POISON2 ((void *) 0x200 + POISON_POINTER_DELTA)
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static inline void INIT_LIST_HEAD(struct list_head *list)
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{
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list->next = list;
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list->prev = list;
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}
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static inline void __list_add(struct list_head *new,
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struct list_head *prev,
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struct list_head *next)
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{
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next->prev = new;
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new->next = next;
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new->prev = prev;
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prev->next = new;
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}
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/**
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* list_add - add a new entry
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* @new: new entry to be added
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* @head: list head to add it after
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*
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* Insert a new entry after the specified head.
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* This is good for implementing stacks.
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*/
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static inline void list_add(struct list_head *new, struct list_head *head)
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{
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__list_add(new, head, head->next);
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}
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/*
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* Delete a list entry by making the prev/next entries
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* point to each other.
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*
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* This is only for internal list manipulation where we know
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* the prev/next entries already!
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*/
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static inline void __list_del(struct list_head * prev, struct list_head * next)
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{
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next->prev = prev;
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prev->next = next;
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}
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/**
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* list_del - deletes entry from list.
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* @entry: the element to delete from the list.
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* Note: list_empty() on entry does not return true after this, the entry is
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* in an undefined state.
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*/
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static inline void __list_del_entry(struct list_head *entry)
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{
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__list_del(entry->prev, entry->next);
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}
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static inline void list_del(struct list_head *entry)
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{
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__list_del(entry->prev, entry->next);
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entry->next = LIST_POISON1;
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entry->prev = LIST_POISON2;
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}
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#define list_entry(ptr, type, member) \
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container_of(ptr, type, member)
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#define list_first_entry(ptr, type, member) \
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@@ -8,6 +8,10 @@
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#define type_max(T) ((T)((__type_half_max(T) - 1) + __type_half_max(T)))
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#define type_min(T) ((T)((T)-type_max(T)-(T)1))
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#ifndef unlikely
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#endif
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#ifdef __GNUC__
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#define GCC_VERSION (__GNUC__ * 10000 \
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+ __GNUC_MINOR__ * 100 \
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@@ -30,26 +34,6 @@
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#else
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/* Checking for unsigned overflow is relatively easy without causing UB. */
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#define __unsigned_add_overflow(a, b, d) ({ \
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typeof(a) __a = (a); \
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typeof(b) __b = (b); \
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typeof(d) __d = (d); \
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(void) (&__a == &__b); \
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(void) (&__a == __d); \
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*__d = __a + __b; \
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*__d < __a; \
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})
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#define __unsigned_sub_overflow(a, b, d) ({ \
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typeof(a) __a = (a); \
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typeof(b) __b = (b); \
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typeof(d) __d = (d); \
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(void) (&__a == &__b); \
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(void) (&__a == __d); \
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*__d = __a - __b; \
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__a < __b; \
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})
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/*
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* If one of a or b is a compile-time constant, this avoids a division.
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*/
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@@ -65,49 +49,6 @@
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__a > 0 && __b > type_max(typeof(__b)) / __a; \
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})
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/*
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* For signed types, detecting overflow is much harder, especially if
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* we want to avoid UB. But the interface of these macros is such that
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* we must provide a result in *d, and in fact we must produce the
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* result promised by gcc's builtins, which is simply the possibly
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* wrapped-around value. Fortunately, we can just formally do the
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* operations in the widest relevant unsigned type (u64) and then
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* truncate the result - gcc is smart enough to generate the same code
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* with and without the (u64) casts.
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*/
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/*
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* Adding two signed integers can overflow only if they have the same
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* sign, and overflow has happened iff the result has the opposite
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* sign.
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*/
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#define __signed_add_overflow(a, b, d) ({ \
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typeof(a) __a = (a); \
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typeof(b) __b = (b); \
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typeof(d) __d = (d); \
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(void) (&__a == &__b); \
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(void) (&__a == __d); \
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*__d = (u64)__a + (u64)__b; \
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(((~(__a ^ __b)) & (*__d ^ __a)) \
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& type_min(typeof(__a))) != 0; \
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})
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/*
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* Subtraction is similar, except that overflow can now happen only
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* when the signs are opposite. In this case, overflow has happened if
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* the result has the opposite sign of a.
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*/
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#define __signed_sub_overflow(a, b, d) ({ \
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typeof(a) __a = (a); \
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typeof(b) __b = (b); \
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typeof(d) __d = (d); \
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(void) (&__a == &__b); \
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(void) (&__a == __d); \
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*__d = (u64)__a - (u64)__b; \
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((((__a ^ __b)) & (*__d ^ __a)) \
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& type_min(typeof(__a))) != 0; \
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})
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/*
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* Signed multiplication is rather hard. gcc always follows C99, so
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* division is truncated towards 0. This means that we can write the
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@@ -132,23 +73,12 @@
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typeof(a) __tmin = type_min(typeof(a)); \
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(void) (&__a == &__b); \
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(void) (&__a == __d); \
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*__d = (u64)__a * (u64)__b; \
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*__d = (__u64)__a * (__u64)__b; \
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(__b > 0 && (__a > __tmax/__b || __a < __tmin/__b)) || \
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(__b < (typeof(__b))-1 && (__a > __tmin/__b || __a < __tmax/__b)) || \
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(__b == (typeof(__b))-1 && __a == __tmin); \
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})
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#define check_add_overflow(a, b, d) \
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__builtin_choose_expr(is_signed_type(typeof(a)), \
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__signed_add_overflow(a, b, d), \
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__unsigned_add_overflow(a, b, d))
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#define check_sub_overflow(a, b, d) \
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__builtin_choose_expr(is_signed_type(typeof(a)), \
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__signed_sub_overflow(a, b, d), \
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__unsigned_sub_overflow(a, b, d))
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#define check_mul_overflow(a, b, d) \
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__builtin_choose_expr(is_signed_type(typeof(a)), \
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__signed_mul_overflow(a, b, d), \
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@@ -157,61 +87,4 @@
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#endif /* COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW */
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/**
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* array_size() - Calculate size of 2-dimensional array.
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*
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* @a: dimension one
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* @b: dimension two
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*
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* Calculates size of 2-dimensional array: @a * @b.
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*
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* Returns: number of bytes needed to represent the array or SIZE_MAX on
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* overflow.
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*/
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static inline size_t array_size(size_t a, size_t b)
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{
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size_t bytes;
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if (check_mul_overflow(a, b, &bytes))
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return SIZE_MAX;
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return bytes;
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}
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/**
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* array3_size() - Calculate size of 3-dimensional array.
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*
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* @a: dimension one
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* @b: dimension two
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* @c: dimension three
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*
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* Calculates size of 3-dimensional array: @a * @b * @c.
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*
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* Returns: number of bytes needed to represent the array or SIZE_MAX on
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* overflow.
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*/
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static inline size_t array3_size(size_t a, size_t b, size_t c)
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{
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size_t bytes;
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if (check_mul_overflow(a, b, &bytes))
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return SIZE_MAX;
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if (check_mul_overflow(bytes, c, &bytes))
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return SIZE_MAX;
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return bytes;
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}
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static inline size_t __ab_c_size(size_t n, size_t size, size_t c)
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{
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size_t bytes;
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if (check_mul_overflow(n, size, &bytes))
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return SIZE_MAX;
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if (check_add_overflow(bytes, c, &bytes))
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return SIZE_MAX;
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return bytes;
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}
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#endif
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@@ -7,22 +7,9 @@
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#include <stddef.h>
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#include <stdint.h>
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#define __SANE_USERSPACE_TYPES__ /* For PPC64, to get LL64 types */
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#include <asm/types.h>
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#include <asm/posix_types.h>
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typedef uint64_t u64;
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typedef int64_t s64;
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typedef __u32 u32;
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typedef __s32 s32;
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typedef __u16 u16;
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typedef __s16 s16;
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typedef __u8 u8;
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typedef __s8 s8;
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#define __bitwise__
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#define __bitwise __bitwise__
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18
scripts/check-reallocarray.sh
Executable file
18
scripts/check-reallocarray.sh
Executable file
@@ -0,0 +1,18 @@
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#/bin/sh
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tfile=$(mktemp /tmp/test_reallocarray_XXXXXXXX.c)
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ofile=${tfile%.c}.o
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cat > $tfile <<EOL
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#define _GNU_SOURCE
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#include <stdlib.h>
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int main(void)
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{
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return !!reallocarray(NULL, 1, 1);
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}
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EOL
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gcc $tfile -o $ofile >& /dev/null
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if [ $? -ne 0 ]; then echo "FAIL"; fi
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/bin/rm -f $tfile $ofile
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23
src/Makefile
Normal file
23
src/Makefile
Normal file
@@ -0,0 +1,23 @@
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# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
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TOPDIR = ..
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INCLUDES = -I. -I$(TOPDIR)/include -I$(TOPDIR)/include/uapi
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CFLAGS = $(INCLUDES) -O2 -Werror -Wall
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FEATURE_REALLOCARRAY := $(shell $(TOPDIR)/scripts/check-reallocarray.sh)
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ifneq ($(FEATURE_REALLOCARRAY),)
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CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
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endif
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OBJFILES = bpf.o btf.o libbpf.o libbpf_errno.o netlink.o nlattr.o str_error.o
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all: libbpf.a
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libbpf.a: $(OBJFILES)
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/bin/rm -f $@; /bin/ar rcs $@ $^
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%.o: %.c
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gcc $(CFLAGS) -c $< -o $@
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clean:
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/bin/rm -f libbpf.a $(OBJFILES)
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