>> 1 // SPDX-License-Identifier: GPL-2.0
1 /* 2 /*
2 * bpf-script-test-prologue.c 3 * bpf-script-test-prologue.c
3 * Test BPF prologue 4 * Test BPF prologue
4 */ 5 */
5 #ifndef LINUX_VERSION_CODE 6 #ifndef LINUX_VERSION_CODE
6 # error Need LINUX_VERSION_CODE 7 # error Need LINUX_VERSION_CODE
7 # error Example: for 4.2 kernel, put 'clang-op 8 # error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
8 #endif 9 #endif
9 #define SEC(NAME) __attribute__((section(NAME) 10 #define SEC(NAME) __attribute__((section(NAME), used))
10 11
11 #include <uapi/linux/fs.h> 12 #include <uapi/linux/fs.h>
12 13
>> 14 /*
>> 15 * If CONFIG_PROFILE_ALL_BRANCHES is selected,
>> 16 * 'if' is redefined after include kernel header.
>> 17 * Recover 'if' for BPF object code.
>> 18 */
>> 19 #ifdef if
>> 20 # undef if
>> 21 #endif
>> 22
13 #define FMODE_READ 0x1 23 #define FMODE_READ 0x1
14 #define FMODE_WRITE 0x2 24 #define FMODE_WRITE 0x2
15 25
16 static void (*bpf_trace_printk)(const char *fm 26 static void (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
17 (void *) 6; 27 (void *) 6;
18 28
19 SEC("func=null_lseek file->f_mode offset orig" 29 SEC("func=null_lseek file->f_mode offset orig")
20 int bpf_func__null_lseek(void *ctx, int err, u !! 30 int bpf_func__null_lseek(void *ctx, int err, unsigned long _f_mode,
21 unsigned long offset, 31 unsigned long offset, unsigned long orig)
22 { 32 {
>> 33 fmode_t f_mode = (fmode_t)_f_mode;
>> 34
23 if (err) 35 if (err)
24 return 0; 36 return 0;
25 if (f_mode & FMODE_WRITE) 37 if (f_mode & FMODE_WRITE)
26 return 0; 38 return 0;
27 if (offset & 1) 39 if (offset & 1)
28 return 0; 40 return 0;
29 if (orig == SEEK_CUR) 41 if (orig == SEEK_CUR)
30 return 0; 42 return 0;
31 return 1; 43 return 1;
32 } 44 }
33 45
34 char _license[] SEC("license") = "GPL"; 46 char _license[] SEC("license") = "GPL";
35 int _version SEC("version") = LINUX_VERSION_CO 47 int _version SEC("version") = LINUX_VERSION_CODE;
36 48
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