mkoffsets.sh 3.8 KB

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  1. # automatically compute structure offsets for gcc targets in ELF format
  2. # (C) 2018 Kai-Uwe Bloem. This work is placed in the public domain.
  3. #
  4. # usage: mkoffsets <output dir>
  5. CC=${CC:-gcc}
  6. # endianess of target (automagically determined below)
  7. ENDIAN=
  8. # compile with target C compiler and extract value from .rodata section
  9. compile_rodata ()
  10. {
  11. $CC $CFLAGS -I .. -c /tmp/getoffs.c -o /tmp/getoffs.o || exit 1
  12. # find the name of the .rodata section (in case -fdata-sections is used)
  13. rosect=$(readelf -S /tmp/getoffs.o | grep '\.rodata' |
  14. sed 's/^[^.]*././;s/ .*//')
  15. # read out .rodata section as hex string (should be only 4 or 8 bytes)
  16. objcopy --dump-section $rosect=/tmp/getoffs.ro /tmp/getoffs.o || exit 1
  17. ro=$(xxd -ps /tmp/getoffs.ro)
  18. if [ "$ENDIAN" = "le" ]; then
  19. # swap needed for le target
  20. hex=""
  21. for b in $(echo $ro | sed 's/\([0-9a-f]\{2\}\)/\1 /g'); do
  22. hex=$b$hex;
  23. done
  24. else
  25. hex=$ro
  26. fi
  27. # extract decimal value from hex string
  28. rodata=$(printf "%d" 0x$hex)
  29. }
  30. # determine member offset and create #define
  31. get_define () # prefix struct member member...
  32. {
  33. prefix=$1; shift
  34. struct=$1; shift
  35. field=$(echo $* | sed 's/ /./g')
  36. name=$(echo $* | sed 's/ /_/g')
  37. echo '#include "pico/pico_int.h"' > /tmp/getoffs.c
  38. echo "static const struct $struct p;" >> /tmp/getoffs.c
  39. echo "const int offs = (char *)&p.$field - (char*)&p;" >>/tmp/getoffs.c
  40. compile_rodata
  41. line=$(printf "#define %-20s 0x%04x" $prefix$name $rodata)
  42. }
  43. # determine endianess
  44. echo "const int one = 1;" >/tmp/getoffs.c
  45. compile_rodata
  46. ENDIAN=$(if [ "$rodata" -eq 1 ]; then echo be; else echo le; fi)
  47. # output header
  48. fn="${1:-.}/pico_int_offs.h"
  49. echo "/* autogenerated by mkoffset.sh, do not edit */" >$fn
  50. echo "/* target endianess: $ENDIAN, compiled with: $CC $CFLAGS */" >>$fn
  51. # output offsets
  52. get_define OFS_Pico_ Pico video reg ; echo "$line" >>$fn
  53. get_define OFS_Pico_ Pico m rotate ; echo "$line" >>$fn
  54. get_define OFS_Pico_ Pico m z80Run ; echo "$line" >>$fn
  55. get_define OFS_Pico_ Pico m dirtyPal ; echo "$line" >>$fn
  56. get_define OFS_Pico_ Pico m hardware ; echo "$line" >>$fn
  57. get_define OFS_Pico_ Pico m z80_reset ; echo "$line" >>$fn
  58. get_define OFS_Pico_ Pico m sram_reg ; echo "$line" >>$fn
  59. get_define OFS_Pico_ Pico sv ; echo "$line" >>$fn
  60. get_define OFS_Pico_ Pico sv data ; echo "$line" >>$fn
  61. get_define OFS_Pico_ Pico sv start ; echo "$line" >>$fn
  62. get_define OFS_Pico_ Pico sv end ; echo "$line" >>$fn
  63. get_define OFS_Pico_ Pico sv flags ; echo "$line" >>$fn
  64. get_define OFS_Pico_ Pico rom ; echo "$line" >>$fn
  65. get_define OFS_Pico_ Pico romsize ; echo "$line" >>$fn
  66. get_define OFS_Pico_ Pico est ; echo "$line" >>$fn
  67. get_define OFS_EST_ PicoEState DrawScanline ; echo "$line" >>$fn
  68. get_define OFS_EST_ PicoEState rendstatus ; echo "$line" >>$fn
  69. get_define OFS_EST_ PicoEState DrawLineDest ; echo "$line" >>$fn
  70. get_define OFS_EST_ PicoEState HighCol ; echo "$line" >>$fn
  71. get_define OFS_EST_ PicoEState HighPreSpr ; echo "$line" >>$fn
  72. get_define OFS_EST_ PicoEState Pico ; echo "$line" >>$fn
  73. get_define OFS_EST_ PicoEState PicoMem_vram ; echo "$line" >>$fn
  74. get_define OFS_EST_ PicoEState PicoMem_cram ; echo "$line" >>$fn
  75. get_define OFS_EST_ PicoEState PicoOpt ; echo "$line" >>$fn
  76. get_define OFS_EST_ PicoEState Draw2FB ; echo "$line" >>$fn
  77. get_define OFS_EST_ PicoEState HighPal ; echo "$line" >>$fn
  78. get_define OFS_PMEM_ PicoMem vram ; echo "$line" >>$fn
  79. get_define OFS_PMEM_ PicoMem vsram ; echo "$line" >>$fn
  80. get_define OFS_SH2_ SH2_ is_slave ; echo "$line" >>$fn
  81. get_define OFS_SH2_ SH2_ p_bios ; echo "$line" >>$fn
  82. get_define OFS_SH2_ SH2_ p_da ; echo "$line" >>$fn
  83. get_define OFS_SH2_ SH2_ p_sdram ; echo "$line" >>$fn
  84. get_define OFS_SH2_ SH2_ p_rom ; echo "$line" >>$fn
  85. get_define OFS_SH2_ SH2_ p_dram ; echo "$line" >>$fn
  86. get_define OFS_SH2_ SH2_ p_drcblk_da ; echo "$line" >>$fn
  87. get_define OFS_SH2_ SH2_ p_drcblk_ram ; echo "$line" >>$fn