1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */ 3 #include <vmlinux.h> 4 #include <bpf/bpf_helpers.h> 5 #include <bpf/bpf_tracing.h> 6 #include <bpf/bpf_core_read.h> 7 #include "bpf_experimental.h" 8 9 struct { 10 __uint(type, BPF_MAP_TYPE_ARENA); 11 __uint(map_flags, BPF_F_MMAPABLE); 12 __uint(max_entries, 100); /* number of pages */ 13 } arena SEC(".maps"); 14 15 #include "bpf_arena_htab.h" 16 17 void __arena *htab_for_user; 18 bool skip = false; 19 20 int zero = 0; 21 22 SEC("syscall") 23 int arena_htab_llvm(void *ctx) 24 { 25 #if defined(__BPF_FEATURE_ADDR_SPACE_CAST) || defined(BPF_ARENA_FORCE_ASM) 26 struct htab __arena *htab; 27 __u64 i; 28 29 htab = bpf_alloc(sizeof(*htab)); 30 cast_kern(htab); 31 htab_init(htab); 32 33 /* first run. No old elems in the table */ 34 for (i = zero; i < 1000; i++) 35 htab_update_elem(htab, i, i); 36 37 /* should replace all elems with new ones */ 38 for (i = zero; i < 1000; i++) 39 htab_update_elem(htab, i, i); 40 cast_user(htab); 41 htab_for_user = htab; 42 #else 43 skip = true; 44 #endif 45 return 0; 46 } 47 48 char _license[] SEC("license") = "GPL"; 49