tools/gcc/files/values.c

   1 #if 0 /* $NetBSD$ */
   2 #
   3 # This is Solaris x86 specific GCC run-time environment patch, which
   4 # makes it possible to reliably deploy .init snippets. Trouble is that
   5 # Solaris linker erroneously pads .init segment with zeros [instead of
   6 # nops], which is bound to SEGV early upon program start-up. This bug
   7 # was recognized by GCC team [it is mentioned in source code], but
   8 # workaround apparently and obviously erroneously slipped away in some
   9 # newer GCC release. This patch compensates for this mishap by dropping
  10 # modified values-X*.o into GCC installation tree. Object modules in
  11 # question are normally provided by Sun and linked prior crtbegin.o.
  12 # Modified versions are additionally crafted with custom .init segment,
  13 # which does some magic:-)
  14 #                                               <appro@fy.chalmers.se>
  15 set -e
  16 gcc=gcc
  17 if [[ "x$1" = x*gcc ]]; then
  18         gcc=$1; shift
  19 fi
  20 gcc_dir=`${gcc} "$@" -print-libgcc-file-name`
  21 gcc_dir=${gcc_dir%/*}   #*/
  22 set -x
  23 ${gcc} "$@" -c -o $gcc_dir/values-Xa.o -DXa $0
  24 ${gcc} "$@" -c -o $gcc_dir/values-Xc.o -DXc $0
  25 ${gcc} "$@" -c -o $gcc_dir/values-Xt.o -DXt $0
  26 exit
  27 #endif
  28
  29 #include <math.h>
  30
  31 #if defined(Xa)
  32 const enum version _lib_version = ansi_1;
  33 #elif defined(Xc)
  34 const enum version _lib_version = strict_ansi;
  35 #elif defined(Xt)
  36 const enum version _lib_version = c_issue_4;
  37 #else
  38 #error "compile by issuing 'ksh -f values.c [gcc] [-m64]'"
  39 #endif
  40
  41 #if defined(__x86_64__)
  42 asm("\n"
  43 ".section       .init\n"
  44 ".align 1\n"
  45 "       leaq    1f(%rip),%rax\n"
  46 "1:     cmpl    $0,2f-1b(%rax)\n"
  47 "       jne     2f\n"
  48 "       jmp     2f+5\n"
  49 "       .skip   9\n"    /* pad up to 0x1b bytes */
  50 "2:\n"
  51 );
  52 #else
  53 asm("\n"
  54 ".section       .init\n"
  55 ".align 1\n"
  56 "       call    1f\n"
  57 "1:     popl    %eax\n"
  58 "       cmpl    $0,2f-1b(%eax)\n"
  59 "       jne     2f\n"
  60 "       jmp     2f+5\n"
  61 "       .skip   10\n"   /* pad up to 0x1b bytes */
  62 "2:\n"
  63 );
  64 #endif