Add NES UNROM mapper support. (#190)

README.md

@@ -148,6 +148,7 @@ executables and libraries for that target.
 | NES (MMC1 mapper)                | `mos-nes-mmc1-clang`     |
 | NES (MMC3 mapper)                | `mos-nes-mmc3-clang`     |
 | NES (NROM mapper)                | `mos-nes-nrom-clang`     |
+| NES (UNROM mapper)               | `mos-nes-unrom-clang`    |
 | Ohio Scientific Challenger 1P    | `mos-osi-c1p-clang`      |
 | PC Engine                        | `mos-pce-clang`          |
 | PC Engine CD                     | `mos-pce-cd-clang`       |

mos-platform/CMakeLists.txt

@@ -61,6 +61,7 @@ add_subdirectory(nes-cnrom)
 add_subdirectory(nes-nrom)
 add_subdirectory(nes-mmc1)
 add_subdirectory(nes-mmc3)
+add_subdirectory(nes-unrom)
 add_subdirectory(osi-c1p)
 add_subdirectory(dodo)
 add_subdirectory(pet)

mos-platform/nes-unrom/CMakeLists.txt

@@ -0,0 +1,18 @@
+platform(nes-unrom COMPLETE PARENT nes)
+
+if(NOT CMAKE_CROSSCOMPILING)
+  return()
+endif()
+
+install(FILES
+  _prg-rom-banked.ld
+  common.ld
+  prg-rom.ld
+TYPE LIB)
+install(FILES bank.h TYPE INCLUDE)
+
+add_platform_object_file(nes-unrom-crt0-o crt0.o ines.s)
+add_platform_object_file(nes-unrom-reset-o reset.o reset.s)
+
+add_platform_library(nes-unrom-c bank.c bank.s)
+target_link_libraries(nes-unrom-c PRIVATE common-asminc)