assemble: add powershell script

This script allows Windows users to rebuild the assembly files.

Signed-off-by: Sean Cross <sean@xobs.io>

assemble.ps1

@@ -0,0 +1,19 @@
+New-Item -Force -Name bin -Type Directory
+
+# remove existing blobs because otherwise this will append object files to the old blobs
+Remove-Item -Force bin/*.a
+
+$crate = "riscv"
+
+riscv64-unknown-elf-gcc -c -mabi=ilp32 -march=rv32i asm.S -o bin/$crate.o
+riscv64-unknown-elf-ar crs bin/riscv32i-unknown-none-elf.a bin/$crate.o
+
+riscv64-unknown-elf-gcc -c -mabi=ilp32 -march=rv32imc asm.S -o bin/$crate.o
+riscv64-unknown-elf-ar crs bin/riscv32imac-unknown-none-elf.a bin/$crate.o
+riscv64-unknown-elf-ar crs bin/riscv32imc-unknown-none-elf.a bin/$crate.o
+
+riscv64-unknown-elf-gcc -c -mabi=lp64 -march=rv64imac asm.S -o bin/$crate.o
+riscv64-unknown-elf-ar crs bin/riscv64imac-unknown-none-elf.a bin/$crate.o
+riscv64-unknown-elf-ar crs bin/riscv64gc-unknown-none-elf.a bin/$crate.o
+
+Remove-Item bin/$crate.o