1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2020 Facebook */ 3 4 #include <test_progs.h> 5 6 struct callback_head { 7 struct callback_head *next; 8 void (*func)(struct callback_head *head); 9 }; 10 11 /* ___shuffled flavor is just an illusion for BPF code, it doesn't really 12 * exist and user-space needs to provide data in the memory layout that 13 * matches callback_head. We just defined ___shuffled flavor to make it easier 14 * to work with the skeleton 15 */ 16 struct callback_head___shuffled { 17 struct callback_head___shuffled *next; 18 void (*func)(struct callback_head *head); 19 }; 20 21 #include "test_core_read_macros.skel.h" 22 23 void test_core_read_macros(void) 24 { 25 int duration = 0, err; 26 struct test_core_read_macros* skel; 27 struct test_core_read_macros__bss *bss; 28 struct callback_head u_probe_in; 29 struct callback_head___shuffled u_core_in; 30 31 skel = test_core_read_macros__open_and_load(); 32 if (CHECK(!skel, "skel_open", "failed to open skeleton\n")) 33 return; 34 bss = skel->bss; 35 bss->my_pid = getpid(); 36 37 /* next pointers have to be set from the kernel side */ 38 bss->k_probe_in.func = (void *)(long)0x1234; 39 bss->k_core_in.func = (void *)(long)0xabcd; 40 41 u_probe_in.next = &u_probe_in; 42 u_probe_in.func = (void *)(long)0x5678; 43 bss->u_probe_in = &u_probe_in; 44 45 u_core_in.next = &u_core_in; 46 u_core_in.func = (void *)(long)0xdbca; 47 bss->u_core_in = &u_core_in; 48 49 err = test_core_read_macros__attach(skel); 50 if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err)) 51 goto cleanup; 52 53 /* trigger tracepoint */ 54 usleep(1); 55 56 ASSERT_EQ(bss->k_probe_out, 0x1234, "k_probe_out"); 57 ASSERT_EQ(bss->k_core_out, 0xabcd, "k_core_out"); 58 59 ASSERT_EQ(bss->u_probe_out, 0x5678, "u_probe_out"); 60 ASSERT_EQ(bss->u_core_out, 0xdbca, "u_core_out"); 61 62 cleanup: 63 test_core_read_macros__destroy(skel); 64 } 65