gcc/ChangeLog:
* doc/invoke.texi (Option Summary): Cover eBPF.
(eBPF Options): New section.
* doc/extend.texi (BPF Built-in Functions): Likewise.
(BPF Kernel Helpers): Likewise.
---
gcc/ChangeLog | 7 +++
gcc/doc/extend.texi | 171
gcc/doc/invoke.texi | 30 +
3 files changed, 208 insertions(+)
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 2ba9b74811a..7b75326590c 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -13603,6 +13603,8 @@ instructions, but allow the compiler to schedule those
calls.
* ARM ARMv8-M Security Extensions::
* AVR Built-in Functions::
* Blackfin Built-in Functions::
+* BPF Built-in Functions::
+* BPF Kernel Helpers::
* FR-V Built-in Functions::
* MIPS DSP Built-in Functions::
* MIPS Paired-Single Support::
@@ -14600,6 +14602,175 @@ void __builtin_bfin_csync (void)
void __builtin_bfin_ssync (void)
@end smallexample
+@node BPF Built-in Functions
+@subsection BPF Built-in Functions
+
+The following built-in functions are available for eBPF targets.
+
+@deftypefn {Built-in Function} unsigned long long __builtin_bpf_load_byte
(unsigned long long @var{offset})
+Load a byte from the @code{struct sk_buff} packet data pointed by the register
@code{%r6} and return it.
+@end deftypefn
+
+@deftypefn {Built-in Function} unsigned long long __builtin_bpf_load_half
(unsigned long long @var{offset})
+Load 16-bits from the @code{struct sk_buff} packet data pointed by the
register @code{%r6} and return it.
+@end deftypefn
+
+@deftypefn {Built-in Function} unsigned long long __builtin_bpf_load_word
(unsigned long long @var{offset})
+Load 32-bits from the @code{struct sk_buff} packet data pointed by the
register @code{%r6} and return it.
+@end deftypefn
+
+@node BPF Kernel Helpers
+@subsection BPF Kernel Helpers
+
+These built-in functions are available for calling kernel helpers, and
+they are available depending on the kernel version selected as the
+CPU.
+
+Rather than using the built-ins directly, it is preferred for programs
+to include @file{bpf-helpers.h} and use the wrappers defined there.
+
+For a full description of what the helpers do, the arguments they
+take, and the returned value, see the
+@file{linux/include/uapi/linux/bpf.h} in a Linux source tree.
+
+@smallexample
+void *__builtin_bpf_helper_map_lookup_elem (void *map, void *key)
+int __builtin_bpf_helper_map_update_elem (void *map, void *key,
+void *value,
+unsigned long long flags)
+int __builtin_bpf_helper_map_delete_elem (void *map, const void *key)
+int __builtin_bpf_helper_map_push_elem (void *map, const void *value,
+ unsigned long long flags)
+int __builtin_bpf_helper_map_pop_elem (void *map, void *value)
+int __builtin_bpf_helper_map_peek_elem (void *map, void *value)
+int __builtin_bpf_helper_clone_redirect (void *skb,
+ unsigned int ifindex,
+ unsigned long long flags)
+int __builtin_bpf_helper_skb_get_tunnel_key (void *ctx, void *key, int size,
int flags)
+int __builtin_bpf_helper_skb_set_tunnel_key (void *ctx, void *key, int size,
int flags)
+int __builtin_bpf_helper_skb_get_tunnel_opt (void *ctx, void *md, int size)
+int __builtin_bpf_helper_skb_set_tunnel_opt (void *ctx, void *md, int size)
+int __builtin_bpf_helper_skb_get_xfrm_state (void *ctx, int index, void *state,
+int size, int flags)
+static unsigned long long __builtin_bpf_helper_skb_cgroup_id (void *ctx)
+static unsigned long long __builtin_bpf_helper_skb_ancestor_cgroup_id
+ (void *ctx, int level)
+int __builtin_bpf_helper_skb_vlan_push (void *ctx, __be16 vlan_proto, __u16
vlan_tci)
+int __builtin_bpf_helper_skb_vlan_pop (void *ctx)
+int __builtin_bpf_helper_skb_ecn_set_ce (void *ctx)
+
+int __builtin_bpf_helper_skb_load_bytes (void *ctx, int off, void *to, int len)
+int __builtin_bpf_helper_skb_load_bytes_relative (void *ctx, int off, void
*to, int len, __u32 start_header)
+int __builtin_bpf_helper_skb_store_bytes (void *ctx, int off, void *from, int
len, int flags)
+int __builtin_bpf_helper_skb_under_cgroup (void *ctx, void *map, int index)
+int __builtin_bpf_helper_skb_change_head (void *, int len, int flags)
+int __builtin_bpf_helper_skb_pull_data (void *, int len)
+int __builtin_bpf_helper_skb_change_proto (void *ctx, __be16 proto, __u64
flags)
+int __builtin_bpf_helper_skb_change_type (void *ctx, __u32 type)
+int __builtin_bpf_helper_skb_change_tail (void *ctx, __u32 len, __u64 flags)
+int __builtin_bpf_helper_skb_adjust_room (void *ctx, __s32 len_diff, __u32
mode,
+ unsigned long long flags)
+@end smallexample
+
+Other helpers:
+
+@smallexample
+int __builtin_bpf_helper_probe_read
