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Linux/tools/perf/tests/bpf-script-test-prologue.c

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

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