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