293 lines
8.8 KiB
Plaintext
293 lines
8.8 KiB
Plaintext
dnl pupa_ASM_USCORE checks if C symbols get an underscore after
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dnl compiling to assembler.
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dnl Written by Pavel Roskin. Based on grub_ASM_EXT_C written by
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dnl Erich Boleyn and modified by Yoshinori K. Okuji.
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AC_DEFUN(pupa_ASM_USCORE,
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[AC_REQUIRE([AC_PROG_CC])
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AC_MSG_CHECKING([if C symbols get an underscore after compilation])
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AC_CACHE_VAL(pupa_cv_asm_uscore,
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[cat > conftest.c <<\EOF
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int
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func (int *list)
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{
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*list = 0;
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return *list;
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}
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EOF
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if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -S conftest.c]) && test -s conftest.s; then
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true
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else
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AC_MSG_ERROR([${CC-cc} failed to produce assembly code])
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fi
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if grep _func conftest.s >/dev/null 2>&1; then
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pupa_cv_asm_uscore=yes
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else
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pupa_cv_asm_uscore=no
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fi
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rm -f conftest*])
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if test "x$pupa_cv_asm_uscore" = xyes; then
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AC_DEFINE_UNQUOTED([HAVE_ASM_USCORE], $pupa_cv_asm_uscore,
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[Define if C symbols get an underscore after compilation])
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fi
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AC_MSG_RESULT([$pupa_cv_asm_uscore])
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])
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dnl Some versions of `objcopy -O binary' vary their output depending
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dnl on the link address.
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AC_DEFUN(pupa_PROG_OBJCOPY_ABSOLUTE,
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[AC_MSG_CHECKING([whether ${OBJCOPY} works for absolute addresses])
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AC_CACHE_VAL(pupa_cv_prog_objcopy_absolute,
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[cat > conftest.c <<\EOF
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void
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cmain (void)
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{
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*((int *) 0x1000) = 2;
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}
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EOF
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if AC_TRY_EVAL(ac_compile) && test -s conftest.o; then :
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else
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AC_MSG_ERROR([${CC-cc} cannot compile C source code])
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fi
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pupa_cv_prog_objcopy_absolute=yes
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for link_addr in 2000 8000 7C00; do
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if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -nostdlib -Wl,-N -Wl,-Ttext -Wl,$link_addr conftest.o -o conftest.exec]); then :
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else
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AC_MSG_ERROR([${CC-cc} cannot link at address $link_addr])
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fi
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if AC_TRY_COMMAND([${OBJCOPY-objcopy} -O binary conftest.exec conftest]); then :
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else
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AC_MSG_ERROR([${OBJCOPY-objcopy} cannot create binary files])
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fi
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if test ! -f conftest.old || AC_TRY_COMMAND([cmp -s conftest.old conftest]); then
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mv -f conftest conftest.old
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else
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pupa_cv_prog_objcopy_absolute=no
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break
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fi
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done
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rm -f conftest*])
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AC_MSG_RESULT([$pupa_cv_prog_objcopy_absolute])
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if test "x$pupa_cv_prog_objcopy_absolute" = xno; then
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AC_MSG_ERROR([PUPA requires a working absolute objcopy; upgrade your binutils])
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fi
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])
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dnl Mass confusion!
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dnl Older versions of GAS interpret `.code16' to mean ``generate 32-bit
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dnl instructions, but implicitly insert addr32 and data32 bytes so
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dnl that the code works in real mode''.
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dnl
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dnl Newer versions of GAS interpret `.code16' to mean ``generate 16-bit
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dnl instructions,'' which seems right. This requires the programmer
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dnl to explicitly insert addr32 and data32 instructions when they want
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dnl them.
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dnl
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dnl We only support the newer versions, because the old versions cause
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dnl major pain, by requiring manual assembly to get 16-bit instructions into
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dnl asm files.
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AC_DEFUN(pupa_I386_ASM_ADDR32,
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[AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([pupa_I386_ASM_PREFIX_REQUIREMENT])
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AC_MSG_CHECKING([for .code16 addr32 assembler support])
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AC_CACHE_VAL(pupa_cv_i386_asm_addr32,
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[cat > conftest.s.in <<\EOF
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.code16
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l1: @ADDR32@ movb %al, l1
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EOF
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if test "x$pupa_cv_i386_asm_prefix_requirement" = xyes; then
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sed -e s/@ADDR32@/addr32/ < conftest.s.in > conftest.s
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else
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sed -e s/@ADDR32@/addr32\;/ < conftest.s.in > conftest.s
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fi
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if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
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pupa_cv_i386_asm_addr32=yes
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else
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pupa_cv_i386_asm_addr32=no
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fi
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rm -f conftest*])
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AC_MSG_RESULT([$pupa_cv_i386_asm_addr32])])
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dnl Later versions of GAS requires that addr32 and data32 prefixes
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dnl appear in the same lines as the instructions they modify, while
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dnl earlier versions requires that they appear in separate lines.
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AC_DEFUN(pupa_I386_ASM_PREFIX_REQUIREMENT,
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[AC_REQUIRE([AC_PROG_CC])
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AC_MSG_CHECKING(dnl
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[whether addr32 must be in the same line as the instruction])
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AC_CACHE_VAL(pupa_cv_i386_asm_prefix_requirement,
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[cat > conftest.s <<\EOF
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.code16
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l1: addr32 movb %al, l1
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EOF
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if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
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pupa_cv_i386_asm_prefix_requirement=yes
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else
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pupa_cv_i386_asm_prefix_requirement=no
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fi
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rm -f conftest*])
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if test "x$pupa_cv_i386_asm_prefix_requirement" = xyes; then
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pupa_tmp_addr32="addr32"
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pupa_tmp_data32="data32"
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else
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pupa_tmp_addr32="addr32;"
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pupa_tmp_data32="data32;"
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fi
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AC_DEFINE_UNQUOTED([ADDR32], $pupa_tmp_addr32,
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[Define it to \"addr32\" or \"addr32;\" to make GAS happy])
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AC_DEFINE_UNQUOTED([DATA32], $pupa_tmp_data32,
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[Define it to \"data32\" or \"data32;\" to make GAS happy])
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AC_MSG_RESULT([$pupa_cv_i386_asm_prefix_requirement])])
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dnl Older versions of GAS require that absolute indirect calls/jumps are
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dnl not prefixed with `*', while later versions warn if not prefixed.
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AC_DEFUN(pupa_I386_ASM_ABSOLUTE_WITHOUT_ASTERISK,
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[AC_REQUIRE([AC_PROG_CC])
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AC_MSG_CHECKING(dnl
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[whether an absolute indirect call/jump must not be prefixed with an asterisk])
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AC_CACHE_VAL(pupa_cv_i386_asm_absolute_without_asterisk,
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[cat > conftest.s <<\EOF
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lcall *(offset)
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offset:
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.long 0
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.word 0
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EOF
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if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
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pupa_cv_i386_asm_absolute_without_asterisk=no
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else
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pupa_cv_i386_asm_absolute_without_asterisk=yes
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fi
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rm -f conftest*])
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if test "x$pupa_cv_i386_asm_absolute_without_asterisk" = xyes; then
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AC_DEFINE([ABSOLUTE_WITHOUT_ASTERISK], 1,
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[Define it if GAS requires that absolute indirect calls/jumps are not prefixed with an asterisk])
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fi
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AC_MSG_RESULT([$pupa_cv_i386_asm_absolute_without_asterisk])])
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dnl Check what symbol is defined as a start symbol.
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dnl Written by Yoshinori K. Okuji.
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AC_DEFUN(pupa_CHECK_START_SYMBOL,
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[AC_REQUIRE([AC_PROG_CC])
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AC_MSG_CHECKING([if start is defined by the compiler])
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AC_CACHE_VAL(pupa_cv_check_start_symbol,
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[AC_TRY_LINK([], [asm ("incl start")],
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pupa_cv_check_start_symbol=yes,
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pupa_cv_check_start_symbol=no)])
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AC_MSG_RESULT([$pupa_cv_check_start_symbol])
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AC_MSG_CHECKING([if _start is defined by the compiler])
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AC_CACHE_VAL(pupa_cv_check_uscore_start_symbol,
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[AC_TRY_LINK([], [asm ("incl _start")],
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pupa_cv_check_uscore_start_symbol=yes,
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pupa_cv_check_uscore_start_symbol=no)])
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AC_MSG_RESULT([$pupa_cv_check_uscore_start_symbol])
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AH_TEMPLATE([START_SYMBOL], [Define it to either start or _start])
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if test "x$pupa_cv_check_start_symbol" = xyes; then
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AC_DEFINE([START_SYMBOL], [start])
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elif test "x$pupa_cv_check_uscore_start_symbol" = xyes; then
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AC_DEFINE([START_SYMBOL], [_start])
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else
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AC_MSG_ERROR([neither start nor _start is defined])
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fi
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])
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dnl Check what symbol is defined as a bss start symbol.
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dnl Written by Michael Hohmoth and Yoshinori K. Okuji.
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AC_DEFUN(pupa_CHECK_BSS_START_SYMBOL,
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[AC_REQUIRE([AC_PROG_CC])
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AC_MSG_CHECKING([if __bss_start is defined by the compiler])
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AC_CACHE_VAL(pupa_cv_check_uscore_uscore_bss_start_symbol,
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[AC_TRY_LINK([], [asm ("incl __bss_start")],
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pupa_cv_check_uscore_uscore_bss_start_symbol=yes,
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pupa_cv_check_uscore_uscore_bss_start_symbol=no)])
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AC_MSG_RESULT([$pupa_cv_check_uscore_uscore_bss_start_symbol])
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AC_MSG_CHECKING([if edata is defined by the compiler])
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AC_CACHE_VAL(pupa_cv_check_edata_symbol,
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[AC_TRY_LINK([], [asm ("incl edata")],
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pupa_cv_check_edata_symbol=yes,
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pupa_cv_check_edata_symbol=no)])
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AC_MSG_RESULT([$pupa_cv_check_edata_symbol])
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AC_MSG_CHECKING([if _edata is defined by the compiler])
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AC_CACHE_VAL(pupa_cv_check_uscore_edata_symbol,
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[AC_TRY_LINK([], [asm ("incl _edata")],
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pupa_cv_check_uscore_edata_symbol=yes,
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pupa_cv_check_uscore_edata_symbol=no)])
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AC_MSG_RESULT([$pupa_cv_check_uscore_edata_symbol])
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AH_TEMPLATE([BSS_START_SYMBOL], [Define it to one of __bss_start, edata and _edata])
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if test "x$pupa_cv_check_uscore_uscore_bss_start_symbol" = xyes; then
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AC_DEFINE([BSS_START_SYMBOL], [__bss_start])
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elif test "x$pupa_cv_check_edata_symbol" = xyes; then
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AC_DEFINE([BSS_START_SYMBOL], [edata])
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elif test "x$pupa_cv_check_uscore_edata_symbol" = xyes; then
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AC_DEFINE([BSS_START_SYMBOL], [_edata])
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else
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AC_MSG_ERROR([none of __bss_start, edata or _edata is defined])
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fi
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])
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dnl Check what symbol is defined as an end symbol.
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dnl Written by Yoshinori K. Okuji.
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AC_DEFUN(pupa_CHECK_END_SYMBOL,
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[AC_REQUIRE([AC_PROG_CC])
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AC_MSG_CHECKING([if end is defined by the compiler])
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AC_CACHE_VAL(pupa_cv_check_end_symbol,
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[AC_TRY_LINK([], [asm ("incl end")],
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pupa_cv_check_end_symbol=yes,
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pupa_cv_check_end_symbol=no)])
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AC_MSG_RESULT([$pupa_cv_check_end_symbol])
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AC_MSG_CHECKING([if _end is defined by the compiler])
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AC_CACHE_VAL(pupa_cv_check_uscore_end_symbol,
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[AC_TRY_LINK([], [asm ("incl _end")],
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pupa_cv_check_uscore_end_symbol=yes,
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pupa_cv_check_uscore_end_symbol=no)])
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AC_MSG_RESULT([$pupa_cv_check_uscore_end_symbol])
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AH_TEMPLATE([END_SYMBOL], [Define it to either end or _end])
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if test "x$pupa_cv_check_end_symbol" = xyes; then
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AC_DEFINE([END_SYMBOL], [end])
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elif test "x$pupa_cv_check_uscore_end_symbol" = xyes; then
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AC_DEFINE([END_SYMBOL], [_end])
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else
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AC_MSG_ERROR([neither end nor _end is defined])
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fi
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])
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