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riscv: Address differences in the linkerscript between GNU LD and LLVM/LLD

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LLVM/LLD does not support STARTUP and ALIGN_WITH_INPUT directives that
GNU LD support. INPUT and ALIGN(8) are supported by LLVM/LLD and can
replace the unsupported STARTUP/ALIGN_WITH_INPUT directives.

The commit conditionally adds the supported directive that linkers
can understand depending on the toolchain used to compile RTEMS
i.e., clang or gcc. Clang is assumed to use LLD by default.
This commit is contained in:
Hesham Almatary
2019-10-23 12:43:17 +01:00
parent ca82ded785
commit f462bcbb0a
4 changed files with 84 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
c/src/lib/libbsp/riscv/griscv/Makefile.am
View File

@@ -23,7 +23,7 @@ start.$(OBJEXT): ../../../../../../bsps/riscv/shared/start/start.S
project_lib_DATA = start.$(OBJEXT)
project_lib_DATA += linkcmds
project_lib_DATA += ../../../../../../bsps/riscv/shared/start/linkcmds.base
project_lib_DATA += linkcmds.base
###############################################################################
# LibBSP #

19
c/src/lib/libbsp/riscv/griscv/configure.ac
View File

@@ -30,11 +30,30 @@ AC_ARG_VAR([$1],[$2])dnl
[$1]=[$]{[$1]:-[$3]}
])
case "${RTEMS_BSP}" in
*clang)
RISCV_LINKER_START_DIRECTIVE_DEFAULT="INPUT"
RISCV_LINKER_ALIGN_DIRECTIVE_DEFAULT="ALIGN(8)"
;;
*)
RISCV_LINKER_START_DIRECTIVE_DEFAULT="STARTUP"
RISCV_LINKER_ALIGN_DIRECTIVE_DEFAULT="ALIGN_WITH_INPUT"
;;
esac
AC_DEFUN([RISCV_LINKCMD],[
AC_ARG_VAR([$1],[$2])dnl
[$1]=[$]{[$1]:-[$3]}
])
RISCV_LINKCMD([RISCV_RAM_REGION_BEGIN],[begin of the RAM region for linker command file (default is 0x40000000)],[${RISCV_RAM_REGION_BEGIN_DEFAULT}])
RISCV_LINKCMD([RISCV_RAM_REGION_SIZE],[size of the RAM region for linker command file (default 16MiB)],[0x01000000])
RISCV_LINKCMD([RISCV_LINKER_START_DIRECTIVE],[GNU LD understands STARTUP directive while LLVM/LLD does not and needs INPUT instead],[${RISCV_LINKER_START_DIRECTIVE_DEFAULT}])
RISCV_LINKCMD([RISCV_LINKER_ALIGN_DIRECTIVE],[LLD does not support ALIGN_WITH_INPUT directive],[${RISCV_LINKER_ALIGN_DIRECTIVE_DEFAULT}])
AC_CONFIG_FILES([
Makefile
linkcmds:../../../../../../bsps/riscv/griscv/start/linkcmds.in
linkcmds.base:../../../../../../bsps/riscv/shared/start/linkcmds.base.in
])
AC_OUTPUT

13
c/src/lib/libbsp/riscv/riscv/configure.ac
View File

@@ -67,6 +67,17 @@ case "${RTEMS_BSP}" in
;;
esac
case "${RTEMS_BSP}" in
*clang)
RISCV_LINKER_START_DIRECTIVE_DEFAULT="INPUT"
RISCV_LINKER_ALIGN_DIRECTIVE_DEFAULT="ALIGN(8)"
;;
*)
RISCV_LINKER_START_DIRECTIVE_DEFAULT="STARTUP"
RISCV_LINKER_ALIGN_DIRECTIVE_DEFAULT="ALIGN_WITH_INPUT"
;;
esac
AC_DEFUN([RISCV_LINKCMD],[
AC_ARG_VAR([$1],[$2])dnl
[$1]=[$]{[$1]:-[$3]}
@@ -74,6 +85,8 @@ AC_ARG_VAR([$1],[$2])dnl
RISCV_LINKCMD([RISCV_RAM_REGION_BEGIN],[begin of the RAM region for linker command file (default is 0x70000000 for 64-bit with -mcmodel=medlow and 0x80000000 for all other)],[${RISCV_RAM_REGION_BEGIN_DEFAULT}])
RISCV_LINKCMD([RISCV_RAM_REGION_SIZE],[size of the RAM region for linker command file (default is 256 MiB for frdme310arty and 64 MiB for all other)],[${RISCV_RAM_REGION_SIZE_DEFAULT}])
RISCV_LINKCMD([RISCV_LINKER_START_DIRECTIVE],[GNU LD understands STARTUP directive while LLVM/LLD does not and needs INPUT instead],[${RISCV_LINKER_START_DIRECTIVE_DEFAULT}])
RISCV_LINKCMD([RISCV_LINKER_ALIGN_DIRECTIVE],[LLD does not support ALIGN_WITH_INPUT directive],[${RISCV_LINKER_ALIGN_DIRECTIVE_DEFAULT}])
AC_CONFIG_FILES([
Makefile