| dnl grub_ASM_USCORE checks if C symbols get an underscore after |
| dnl compiling to assembler. |
| dnl Written by Pavel Roskin. Based on grub_ASM_EXT_C written by |
| dnl Erich Boleyn and modified by OKUJI Yoshinori |
| AC_DEFUN(grub_ASM_USCORE, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING([if C symbols get an underscore after compilation]) |
| AC_CACHE_VAL(grub_cv_asm_uscore, |
| [cat > conftest.c <<\EOF |
| int |
| func (int *list) |
| { |
| *list = 0; |
| return *list; |
| } |
| EOF |
| |
| if AC_TRY_COMMAND([${CC-cc} -S conftest.c]) && test -s conftest.s; then |
| true |
| else |
| AC_MSG_ERROR([${CC-cc} failed to produce assembly code]) |
| fi |
| |
| if grep _func conftest.s >/dev/null 2>&1; then |
| grub_cv_asm_uscore=yes |
| AC_DEFINE_UNQUOTED([HAVE_ASM_USCORE], $grub_cv_asm_uscore, |
| [Define if C symbols get an underscore after compilation]) |
| else |
| grub_cv_asm_uscore=no |
| fi |
| |
| rm -f conftest*]) |
| |
| AC_MSG_RESULT([$grub_cv_asm_uscore]) |
| ]) |
| |
| |
| dnl Some versions of `objcopy -O binary' vary their output depending |
| dnl on the link address. |
| AC_DEFUN(grub_PROG_OBJCOPY_ABSOLUTE, |
| [AC_MSG_CHECKING([whether ${OBJCOPY} works for absolute addresses]) |
| AC_CACHE_VAL(grub_cv_prog_objcopy_absolute, |
| [cat > conftest.c <<\EOF |
| void |
| blah (void) |
| { |
| *((int *) 0x1000) = 2; |
| } |
| EOF |
| |
| if AC_TRY_EVAL(ac_compile) && test -s conftest.o; then : |
| else |
| AC_MSG_ERROR([${CC-cc} cannot compile C source code]) |
| fi |
| grub_cv_prog_objcopy_absolute=yes |
| for link_addr in 2000 8000 7C00; do |
| if AC_TRY_COMMAND([${LD-ld} -N -Ttext $link_addr conftest.o -o conftest.exec]); then : |
| else |
| AC_MSG_ERROR([${LD-ld} cannot link at address $link_addr]) |
| fi |
| if AC_TRY_COMMAND([${OBJCOPY-objcopy} -O binary conftest.exec conftest]); then : |
| else |
| AC_MSG_ERROR([${OBJCOPY-objcopy} cannot create binary files]) |
| fi |
| if test ! -f conftest.old || AC_TRY_COMMAND([cmp -s conftest.old conftest]); then |
| mv -f conftest conftest.old |
| else |
| grub_cv_prog_objcopy_absolute=no |
| break |
| fi |
| done |
| rm -f conftest*]) |
| AC_MSG_RESULT([$grub_cv_prog_objcopy_absolute])]) |
| |
| dnl Mass confusion! |
| dnl Older versions of GAS interpret `.code16' to mean ``generate 32-bit |
| dnl instructions, but implicitly insert addr32 and data32 bytes so |
| dnl that the code works in real mode''. |
| dnl |
| dnl Newer versions of GAS interpret `.code16' to mean ``generate 16-bit |
| dnl instructions,'' which seems right. This requires the programmer |
| dnl to explicitly insert addr32 and data32 instructions when they want |
| dnl them. |
| dnl |
| dnl We only support the newer versions, because the old versions cause |
| dnl major pain, by requiring manual assembly to get 16-bit instructions into |
| dnl stage1/stage1.S. |
| AC_DEFUN(grub_ASM_ADDR32, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_REQUIRE([grub_ASM_PREFIX_REQUIREMENT]) |
| AC_MSG_CHECKING([for .code16 addr32 assembler support]) |
| AC_CACHE_VAL(grub_cv_asm_addr32, |
| [cat > conftest.s <<\EOF |
| .code16 |
| l1: ADDR32 movb %al, l1 |
| EOF |
| |
| if AC_TRY_COMMAND([${CC-cc} -c conftest.s]) && test -s conftest.o; then |
| grub_cv_asm_addr32=yes |
| else |
| grub_cv_asm_addr32=no |
| fi |
| rm -f conftest*]) |
| AC_MSG_RESULT([$grub_cv_asm_addr32])]) |
| |
| dnl |
| dnl Later versions of GAS requires that addr32 and data32 prefixes |
| dnl appear in the same lines as the instructions they modify, while |
| dnl earlier versions requires that they appear in separate lines. |
| AC_DEFUN(grub_ASM_PREFIX_REQUIREMENT, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING(dnl |
| [whether addr32 must be in the same line as the instruction]) |
| AC_CACHE_VAL(grub_cv_asm_prefix_requirement, |
| [cat > conftest.s <<\EOF |
| .code16 |
| l1: addr32 movb %al, l1 |
| EOF |
| |
| if AC_TRY_COMMAND([${CC-cc} -c conftest.s]) && test -s conftest.o; then |
| grub_cv_asm_prefix_requirement=yes |
| else |
| grub_cv_asm_prefix_requirement=no |
| fi |
| |
| rm -f conftest*]) |
| |
| if test "x$grub_cv_asm_prefix_requirement" = xyes; then |
| grub_tmp_addr32="addr32" |
| grub_tmp_data32="data32" |
| else |
| grub_tmp_addr32="addr32;" |
| grub_tmp_data32="data32;" |
| fi |
| |
| AC_DEFINE_UNQUOTED([ADDR32], $grub_tmp_addr32, |
| [Define it to \"addr32\" or \"addr32;\" to make GAS happy]) |
| AC_DEFINE_UNQUOTED([DATA32], $grub_tmp_data32, |
| [Define it to \"data32\" or \"data32;\" to make GAS happy]) |
| |
| AC_MSG_RESULT([$grub_cv_asm_prefix_requirement])]) |
| |
| dnl |
| dnl grub_CHECK_START_SYMBOL checks if start is automatically defined by |
| dnl the compiler. |
| dnl Written by OKUJI Yoshinori |
| AC_DEFUN(grub_CHECK_START_SYMBOL, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING([if start is defined by the compiler]) |
| AC_CACHE_VAL(grub_cv_check_start_symbol, |
| [cat > conftest.c <<\EOF |
| int |
| main (void) |
| { |
| asm ("incl start"); |
| return 0; |
| } |
| EOF |
| |
| if AC_TRY_COMMAND([${CC-cc} conftest.c -o conftest]) && test -s conftest; then |
| grub_cv_check_start_symbol=yes |
| else |
| grub_cv_check_start_symbol=no |
| fi |
| |
| rm -f conftest*]) |
| |
| if test "x$grub_cv_check_start_symbol" = xyes; then |
| AC_DEFINE([HAVE_START_SYMBOL]) |
| fi |
| |
| AC_MSG_RESULT([$grub_cv_check_start_symbol]) |
| ]) |
| |
| dnl |
| dnl grub_CHECK_USCORE_START_SYMBOL checks if _start is automatically |
| dnl defined by the compiler. |
| dnl Written by OKUJI Yoshinori |
| AC_DEFUN(grub_CHECK_USCORE_START_SYMBOL, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING([if _start is defined by the compiler]) |
| AC_CACHE_VAL(grub_cv_check_uscore_start_symbol, |
| [cat > conftest.c <<\EOF |
| int |
| main (void) |
| { |
| asm ("incl _start"); |
| return 0; |
| } |
| EOF |
| |
| if AC_TRY_COMMAND([${CC-cc} conftest.c -o conftest]) && test -s conftest; then |
| grub_cv_check_uscore_start_symbol=yes |
| else |
| grub_cv_check_uscore_start_symbol=no |
| fi |
| |
| rm -f conftest*]) |
| |
| if test "x$grub_cv_check_uscore_start_symbol" = xyes; then |
| AC_DEFINE([HAVE_USCORE_START_SYMBOL]) |
| fi |
| |
| AC_MSG_RESULT([$grub_cv_check_uscore_start_symbol]) |
| ]) |
| |
| dnl |
| dnl grub_CHECK_END_SYMBOL checks if end is automatically defined by the |
| dnl compiler. |
| dnl Written by OKUJI Yoshinori |
| AC_DEFUN(grub_CHECK_END_SYMBOL, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING([if end is defined by the compiler]) |
| AC_CACHE_VAL(grub_cv_check_end_symbol, |
| [cat > conftest.c <<\EOF |
| int |
| main (void) |
| { |
| asm ("incl end); |
| return 0; |
| } |
| EOF |
| |
| if AC_TRY_COMMAND([${CC-cc} conftest.c -o conftest]) && test -s conftest; then |
| grub_cv_check_end_symbol=yes |
| else |
| grub_cv_check_end_symbol=no |
| fi |
| |
| rm -f conftest*]) |
| |
| if test "x$grub_cv_check_end_symbol" = xyes; then |
| AC_DEFINE([HAVE_END_SYMBOL]) |
| fi |
| |
| AC_MSG_RESULT([$grub_cv_check_end_symbol]) |
| ]) |
| |
| dnl |
| dnl grub_CHECK_USCORE_END_SYMBOL checks if _end is automatically defined |
| dnl by the compiler. |
| dnl Written by OKUJI Yoshinori |
| AC_DEFUN(grub_CHECK_USCORE_END_SYMBOL, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING([if _end is defined by the compiler]) |
| AC_CACHE_VAL(grub_cv_check_uscore_end_symbol, |
| [cat > conftest.c <<\EOF |
| int |
| main (void) |
| { |
| asm ("incl _end"); |
| return 0; |
| } |
| EOF |
| |
| if AC_TRY_COMMAND([${CC-cc} conftest.c -o conftest]) && test -s conftest; then |
| grub_cv_check_uscore_end_symbol=yes |
| else |
| grub_cv_check_uscore_end_symbol=no |
| fi |
| |
| if test "x$grub_cv_check_uscore_end_symbol" = xyes; then |
| AC_DEFINE([HAVE_USCORE_END_SYMBOL]) |
| fi |
| |
| rm -f conftest*]) |
| |
| AC_MSG_RESULT([$grub_cv_check_uscore_end_symbol]) |
| ]) |