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

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

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