Mirror of strace – the linux syscall tracer
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

gen_bpf_attr_check.sh 2.9KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677
  1. #!/bin/sh -efu
  2. # Copyright (c) 2018 Dmitry V. Levin <ldv@altlinux.org>
  3. # All rights reserved.
  4. #
  5. # Redistribution and use in source and binary forms, with or without
  6. # modification, are permitted provided that the following conditions
  7. # are met:
  8. # 1. Redistributions of source code must retain the above copyright
  9. # notice, this list of conditions and the following disclaimer.
  10. # 2. Redistributions in binary form must reproduce the above copyright
  11. # notice, this list of conditions and the following disclaimer in the
  12. # documentation and/or other materials provided with the distribution.
  13. # 3. The name of the author may not be used to endorse or promote products
  14. # derived from this software without specific prior written permission.
  15. #
  16. # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17. # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18. # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19. # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20. # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21. # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22. # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23. # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24. # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25. # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26. input="$1"
  27. shift
  28. cat <<EOF
  29. /* Generated by $0 from $input; do not edit. */
  30. #include "defs.h"
  31. #ifdef HAVE_LINUX_BPF_H
  32. # include <linux/bpf.h>
  33. # include "bpf_attr.h"
  34. # include "static_assert.h"
  35. # define SoM(type_, member_) (sizeof(((type_ *)0)->member_))
  36. EOF
  37. for struct in $(sed -n 's/^struct \([^[:space:]]\+_struct\) .*/\1/p' < "$input"); do
  38. case "$struct" in
  39. BPF_*) type_name='union bpf_attr' ;;
  40. *) type_name="struct ${struct%_struct}" ;;
  41. esac
  42. TYPE_NAME="$(printf %s "$type_name" |tr '[:lower:] ' '[:upper:]_')"
  43. enum="$(sed -n 's/^struct '"$struct"' \/\* \([^[:space:]]\+\) \*\/ {.*/\1/p' < "$input")"
  44. ENUM="$(printf %s "$enum" |tr '[:lower:]' '[:upper:]')"
  45. enum="$enum${enum:+.}"
  46. ENUM="$ENUM${ENUM:+_}"
  47. sed -n '/^struct '"$struct"' [^{]*{/,/^};$/p' < "$input" |
  48. sed -n 's/^[[:space:]]\+[^][;]*[[:space:]]\([^][[:space:];]\+\)\(\[[^;]*\]\)\?;$/\1/p' |
  49. while read field; do
  50. FIELD="$(printf %s "$field" |tr '[:lower:]' '[:upper:]')"
  51. cat <<EOF
  52. # ifdef HAVE_${TYPE_NAME}_$ENUM$FIELD
  53. static_assert(SoM(struct $struct, $field) == SoM($type_name, $enum$field),
  54. "$struct.$field size mismatch");
  55. static_assert(offsetof(struct $struct, $field) == offsetof($type_name, $enum$field),
  56. "$struct.$field offset mismatch");
  57. # endif /* HAVE_${TYPE_NAME}_$ENUM$FIELD */
  58. EOF
  59. done
  60. cat <<EOF
  61. static_assert(${struct}_size == expected_${struct}_size,
  62. "${struct}_size mismatch");
  63. EOF
  64. done
  65. cat <<'EOF'
  66. #endif /* HAVE_LINUX_BPF_H */
  67. EOF