spec: bits for loongarch64 cross-toolchain

Note: toolchains in sisyphus are too old and don't support
loongarch yet

cross-toolchain.spec

@@ -41,6 +41,13 @@
 %define target_libdir lib64
 %endif
 
+%if "%target_arch" == "loongarch64"
+%define target_kernel loongarch
+%define target_qemu_arch loongarch64
+%define target_ld_linux /lib64/ld-linux-loongarch-lp64d.so.1
+%define target_libdir lib64
+%endif
+
 %if "%target_arch" != "arm"
 %define target %target_arch-linux-gnu
 %else
@@ -64,7 +71,11 @@ ExclusiveArch: x86_64
 %define gcc_branch %(v=%gcc_version; v=${v%%%%.*}; echo $v)
 %define binutils_version %{get_version binutils-source}
 %define glibc_version %{get_version glibc-source}
+%if "%target_arch" == "loongarch64"
+%define kernel_version 6.0
+%else
 %define kernel_version 5.10
+%endif
 
 
 BuildPreReq: gcc-c++
@@ -540,6 +551,29 @@ _start:
 EOF
 %endif
 
+%if "%target_arch" == "loongarch64"
+cat > bye.S <<EOF
+#include <sys/syscall.h>
+
+.data
+message: .asciz "bye-bye ...\n"
+
+.text
+.global _start
+_start:
+	li.w \$a7, __NR_write
+	li.w \$a0, 1 # stdout file descriptor
+	la \$a1, message
+	li.w \$a2, 12 # message length
+	syscall 0x0
+
+	li.w \$a7, __NR_exit
+	li.w \$a0, 0
+	syscall 0x0
+
+.section	.note.GNU-stack,"",@progbits
+EOF
+
 env PATH=%buildroot%prefix/bin:$PATH \
 %buildroot%prefix/bin/%target-gcc -static -nostdlib -o bye_asm bye.S || exit 11
 qemu-%target_qemu_arch-static ./bye_asm || exit 13