On Wed, Jun 13, 2018 at 10:39 AM, Sebastian Huber
<sebastian.hu...@embedded-brains.de> wrote:
> Add multilib variants for -march=rv64imafd, e.g. to support the BOOMv2 core.
>
> Add -mcmodel=medany as a variant of the 64-bit multilibs for RTEMS. The
> ratinale for this change is that several existing RISC-V chips map the
> RAM at 0x80000000. In RTEMS, we do not use virtual memory, so
> applications will run at this location which is outside the +-2GiB range
> in a 64-bit configuration.
>
> gcc/
> * config.gcc (riscv*-*-elf* | riscv*-*-rtems*): Use custom
> multilibs for *-*-rtems*.
> * config/riscv/t-rtems: New file.
> ---
> gcc/config.gcc | 20 +++++++++++---------
> gcc/config/riscv/t-rtems | 25 +++++++++++++++++++++++++
> 2 files changed, 36 insertions(+), 9 deletions(-)
> create mode 100644 gcc/config/riscv/t-rtems
>
> diff --git a/gcc/config.gcc b/gcc/config.gcc
> index c3aecbfe764..25383423721 100644
> --- a/gcc/config.gcc
> +++ b/gcc/config.gcc
> @@ -2085,10 +2085,17 @@ riscv*-*-linux*)
> ;;
> riscv*-*-elf* | riscv*-*-rtems*)
> tm_file="elfos.h newlib-stdint.h ${tm_file} riscv/elf.h"
> - case "x${enable_multilib}" in
> - xno) ;;
> - xyes) tmake_file="${tmake_file} riscv/t-elf-multilib" ;;
> - *) echo "Unknown value for enable_multilib"; exit 1
> + case ${target} in
> + *-*-rtems*)
> + tm_file="${tm_file} rtems.h riscv/rtems.h"
> + tmake_file="${tmake_file} riscv/t-rtems"
> + ;;
> + *)
> + case "x${enable_multilib}" in
> + xno) ;;
> + xyes) tmake_file="${tmake_file} riscv/t-elf-multilib" ;;
> + *) echo "Unknown value for enable_multilib"; exit 1
> + esac
> esac
> tmake_file="${tmake_file} riscv/t-riscv"
> gnu_ld=yes
> @@ -2096,11 +2103,6 @@ riscv*-*-elf* | riscv*-*-rtems*)
> # Force .init_array support. The configure script cannot always
> # automatically detect that GAS supports it, yet we require it.
> gcc_cv_initfini_array=yes
> - case ${target} in
> - riscv*-*-rtems*)
> - tm_file="${tm_file} rtems.h riscv/rtems.h"
> - ;;
> - esac
> ;;
> riscv*-*-freebsd*)
> tm_file="${tm_file} elfos.h ${fbsd_tm_file} riscv/freebsd.h"
> diff --git a/gcc/config/riscv/t-rtems b/gcc/config/riscv/t-rtems
> new file mode 100644
> index 00000000000..41f5927fc87
> --- /dev/null
> +++ b/gcc/config/riscv/t-rtems
> @@ -0,0 +1,25 @@
> +MULTILIB_OPTIONS =
> +MULTILIB_DIRNAMES =
> +
> +MULTILIB_OPTIONS +=
> march=rv32i/march=rv32im/march=rv32imafd/march=rv32iac/march=rv32imac/march=rv32imafc/march=rv64imafd/march=rv64imac/march=rv64imafdc
> +MULTILIB_DIRNAMES += rv32i rv32im rv32imafd rv32iac
> rv32imac rv32imafc rv64imafd rv64imac rv64imafdc
> +
Is there a specific reason why there is no rv32ima?
> +MULTILIB_OPTIONS +=
> mabi=ilp32/mabi=ilp32f/mabi=ilp32d/mabi=lp64/mabi=lp64d
> +MULTILIB_DIRNAMES += ilp32 ilp32f ilp32d lp64 lp64d
> +
> +MULTILIB_OPTIONS += mcmodel=medany
> +MULTILIB_DIRNAMES += medany
> +
> +MULTILIB_REQUIRED =
> +MULTILIB_REQUIRED += march=rv32i/mabi=ilp32
> +MULTILIB_REQUIRED += march=rv32im/mabi=ilp32
> +MULTILIB_REQUIRED += march=rv32imafd/mabi=ilp32d
> +MULTILIB_REQUIRED += march=rv32iac/mabi=ilp32
> +MULTILIB_REQUIRED += march=rv32imac/mabi=ilp32
> +MULTILIB_REQUIRED += march=rv32imafc/mabi=ilp32f
> +MULTILIB_REQUIRED += march=rv64imafd/mabi=lp64d
> +MULTILIB_REQUIRED += march=rv64imafd/mabi=lp64d/mcmodel=medany
> +MULTILIB_REQUIRED += march=rv64imac/mabi=lp64
> +MULTILIB_REQUIRED += march=rv64imac/mabi=lp64/mcmodel=medany
> +MULTILIB_REQUIRED += march=rv64imafdc/mabi=lp64d
> +MULTILIB_REQUIRED += march=rv64imafdc/mabi=lp64d/mcmodel=medany
> --
> 2.13.7
>
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> http://lists.rtems.org/mailman/listinfo/devel
--
Hesham
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