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Remove libgcc dependency.

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libgcc for boot environment isn't always present and compatible.
libgcc is often absent if endianness or bit-size at boot is different
from running OS.
libgcc may use optimised opcodes that aren't available on boot time.
So instead of relying on libgcc shipped with the compiler, supply
the functions in GRUB directly.
Tests are present to ensure that those replacement functions behave the
way compiler expects them to.
This commit is contained in:
Vladimir Serbinenko 2015-03-03 20:23:42 +01:00
parent 77697d14e5
commit 064360e667
21 changed files with 1441 additions and 479 deletions
Download patch file Download diff file Expand all files Collapse all files

25
configure.ac
View file

@ -1131,22 +1131,17 @@ fi
# Set them to their new values for the tests below.
CC="$TARGET_CC"
if test "x$TARGET_APPLE_LINKER" = x1 ; then
if test x"$platform" = xemu ; then
CFLAGS="$TARGET_CFLAGS -Wno-error"
elif test "x$TARGET_APPLE_LINKER" = x1 ; then
CFLAGS="$TARGET_CFLAGS -nostdlib -static -Wno-error"
else
CFLAGS="$TARGET_CFLAGS -nostdlib -Wno-error"
fi
CPPFLAGS="$TARGET_CPPFLAGS"
if test x$target_cpu = xi386 || test x$target_cpu = xx86_64 || test "x$grub_cv_cc_target_clang" = xyes ; then
TARGET_LIBGCC=
else
TARGET_LIBGCC=-lgcc
fi
LIBS="$TARGET_LIBGCC"
grub_ASM_USCORE
if test "x$TARGET_APPLE_LINKER" = x0 ; then
if test "x$TARGET_APPLE_LINKER" = x0 && test x"$platform" != xemu; then
if test x$grub_cv_asm_uscore = xyes; then
DEFSYM="-Wl,--defsym,_abort=_main -Wl,--defsym,__main=_main"
else
@ -1156,7 +1151,9 @@ CFLAGS="$TARGET_CFLAGS -nostdlib $DEFSYM"
fi
# Check for libgcc symbols
AC_CHECK_FUNCS(__bswapsi2 __bswapdi2 __ashldi3 __ashrdi3 __lshrdi3 __ucmpdi2 _restgpr_14_x)
if test x"$platform" = xemu; then
AC_CHECK_FUNCS(__udivsi3 __umodsi3 __divsi3 __modsi3 __divdi3 __moddi3 __udivdi3 __umoddi3 __ctzdi2 __ctzsi2 __aeabi_uidiv __aeabi_uidivmod __aeabi_idiv __aeabi_idivmod __aeabi_ulcmp __muldi3 __aeabi_lmul __aeabi_memcpy __aeabi_memset __aeabi_lasr __aeabi_llsl __aeabi_llsr _restgpr_14_x __ucmpdi2 __ashldi3 __ashrdi3 __lshrdi3 __bswapsi2 __bswapdi2 __bzero __register_frame_info __deregister_frame_info ___chkstk_ms __chkstk_ms)
fi
if test "x$TARGET_APPLE_LINKER" = x1 ; then
CFLAGS="$TARGET_CFLAGS -nostdlib -static"
@ -1717,12 +1714,6 @@ if test x"$enable_werror" != xno ; then
HOST_CFLAGS="$HOST_CFLAGS -Werror"
fi
if test "x$grub_cv_cc_target_clang" = xno; then
TARGET_LDFLAGS_STATIC_LIBGCC="-static-libgcc"
else
TARGET_LDFLAGS_STATIC_LIBGCC=
fi
TARGET_CPP="$TARGET_CC -E"
TARGET_CCAS=$TARGET_CC
@ -1739,8 +1730,6 @@ AC_SUBST(GRUB_TARGET_CPU)
AC_SUBST(GRUB_PLATFORM)
AC_SUBST(TARGET_OBJCONV)
AC_SUBST(TARGET_LIBGCC)
AC_SUBST(TARGET_LDFLAGS_STATIC_LIBGCC)
AC_SUBST(TARGET_CPP)
AC_SUBST(TARGET_CCAS)
AC_SUBST(TARGET_OBJ2ELF)