Add nes-slrom platform.

mysterymath · mysterymath · commit 432ecbdd8b57 · 2022-04-13T14:24:30.000-07:00
diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
@@ -27,6 +27,6 @@ if(HOSTED)
   install_example(init-functions)
 endif()
 
-if(PLATFORM MATCHES ^nes-nrom)
-  add_subdirectory(nes-nrom)
+if(PLATFORM MATCHES ^nes-)
+  add_subdirectory(nes)
 endif()
diff --git a/examples/nes/CMakeLists.txt b/examples/nes/CMakeLists.txt
diff --git a/examples/nes/color-cycle.c b/examples/nes/color-cycle.c
diff --git a/mos-platform/CMakeLists.txt b/mos-platform/CMakeLists.txt
@@ -43,3 +43,4 @@ add_subdirectory(nes)
 add_subdirectory(nes-nrom)
 add_subdirectory(nes-nrom-128)
 add_subdirectory(nes-nrom-256)
+add_subdirectory(nes-slrom)
diff --git a/mos-platform/common/ldscripts/CMakeLists.txt b/mos-platform/common/ldscripts/CMakeLists.txt
@@ -5,9 +5,15 @@ install(
     c.ld
 
     bss.ld
+    bss-sections.ld
+    bss-symbols.ld
     data.ld
+    data-sections.ld
+    data-symbols.ld
     noinit.ld
+    noinit-sections.ld
     rodata.ld
+    rodata-sections.ld
     text.ld
-  TYPE LIB
-)
+    text-sections.ld
+  TYPE LIB)
diff --git a/mos-platform/common/ldscripts/bss-sections.ld b/mos-platform/common/ldscripts/bss-sections.ld
@@ -0,0 +1,3 @@
+__bss_start = .;
+*(.bss .bss.* COMMON)
+__bss_end = .;
diff --git a/mos-platform/common/ldscripts/bss-symbols.ld b/mos-platform/common/ldscripts/bss-symbols.ld
@@ -0,0 +1 @@
+__bss_size = SIZEOF(.bss);
diff --git a/mos-platform/common/ldscripts/bss.ld b/mos-platform/common/ldscripts/bss.ld
@@ -1,6 +1,2 @@
-.bss (NOLOAD) : {
-    __bss_start = .;
-    *(.bss .bss.* COMMON)
-    __bss_end = .;
-}
-__bss_size = SIZEOF(.bss);
+.bss (NOLOAD) : { INCLUDE bss-sections.ld }
+INCLUDE bss-symbols.ld
diff --git a/mos-platform/common/ldscripts/data-sections.ld b/mos-platform/common/ldscripts/data-sections.ld
@@ -0,0 +1,3 @@
+__data_start = .;
+*(.data .data.*)
+__data_end = .;
diff --git a/mos-platform/common/ldscripts/data-symbols.ld b/mos-platform/common/ldscripts/data-symbols.ld
@@ -0,0 +1,2 @@
+__data_load_start = LOADADDR(.data);
+__data_size = SIZEOF(.data);
diff --git a/mos-platform/common/ldscripts/data.ld b/mos-platform/common/ldscripts/data.ld
@@ -1,7 +1,2 @@
-.data : {
-    __data_start = .;
-    *(.data .data.*)
-    __data_end = .;
-}
-__data_load_start = LOADADDR(.data);
-__data_size = SIZEOF(.data);
+.data : { INCLUDE data-sections.ld }
+INCLUDE data-symbols.ld
diff --git a/mos-platform/common/ldscripts/noinit-sections.ld b/mos-platform/common/ldscripts/noinit-sections.ld
@@ -0,0 +1,2 @@
+*(.noinit .noinit.*)
+__heap_start = .;
diff --git a/mos-platform/common/ldscripts/noinit.ld b/mos-platform/common/ldscripts/noinit.ld
@@ -1,4 +1 @@
-.noinit (NOLOAD) : {
-    *(.noinit .noinit.*)
-    __heap_start = .;
-}
+.noinit (NOLOAD) : { INCLUDE noinit-sections.ld }
diff --git a/mos-platform/common/ldscripts/rodata-sections.ld b/mos-platform/common/ldscripts/rodata-sections.ld
@@ -0,0 +1 @@
+*(.rodata .rodata.*)
diff --git a/mos-platform/common/ldscripts/rodata.ld b/mos-platform/common/ldscripts/rodata.ld
@@ -1,3 +1 @@
-.rodata : {
-    *(.rodata .rodata.*)
-}
+.rodata : { INCLUDE rodata-sections.ld }
diff --git a/mos-platform/common/ldscripts/text-sections.ld b/mos-platform/common/ldscripts/text-sections.ld
@@ -0,0 +1,25 @@
+/* A mechanism for dynamically building an _init script. */
+_init = .;
+_start = .;
+*(SORT_BY_INIT_PRIORITY(.init.* .init))
+*(.call_main)
+*(.after_main)
+
+/* A mechanism for dynamically building a _fini script. */
+_fini = .;
+*(SORT_BY_INIT_PRIORITY(.fini.* .fini))
+*(.fini_rts)
+
+*(.text .text.*)
+
+/* A sorted list of initialization function pointers. Used for GCC
+* constructor attribute and C++ global constructors. */
+__init_array_start = .;
+KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.* .init_array)))
+__init_array_end = .;
+
+/* A sorted list of finalization function pointers. Used for GCC destructor
+* attribute. */
+__fini_array_start = .;
+KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.* .fini_array)))
+__fini_array_end = .;
diff --git a/mos-platform/common/ldscripts/text.ld b/mos-platform/common/ldscripts/text.ld
@@ -1,27 +1 @@
-.text : {
-    /* A mechanism for dynamically building an _init script. */
-    _init = .;
-    _start = .;
-    *(SORT_BY_INIT_PRIORITY(.init.* .init))
-    *(.call_main)
-    *(.after_main)
-
-    /* A mechanism for dynamically building a _fini script. */
-    _fini = .;
-    *(SORT_BY_INIT_PRIORITY(.fini.* .fini))
-    *(.fini_rts)
-
-    *(.text .text.*)
-
-    /* A sorted list of initialization function pointers. Used for GCC
-    * constructor attribute and C++ global constructors. */
-    __init_array_start = .;
-    KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.* .init_array)))
-    __init_array_end = .;
-
-    /* A sorted list of finalization function pointers. Used for GCC destructor
-    * attribute. */
-    __fini_array_start = .;
-    KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.* .fini_array)))
-    __fini_array_end = .;
-}
+.text : { INCLUDE text-sections.ld }
diff --git a/mos-platform/nes-nrom/nes-nrom.ld b/mos-platform/nes-nrom/nes-nrom.ld
@@ -18,13 +18,8 @@ SECTIONS {
   INCLUDE text.ld
   INCLUDE rodata.ld
   /* The data segment is loaded from PRG-ROM, but used in RAM. */
-  .data : {
-      __data_start = .;
-      *(.data .data.*)
-      __data_end = .;
-  } AT>prg_rom
-  __data_load_start = LOADADDR(.data);
-  __data_size = SIZEOF(.data);
+  .data : { INCLUDE data-sections.ld } AT>prg_rom
+  INCLUDE data-symbols.ld
   INCLUDE bss.ld
   INCLUDE noinit.ld
 
diff --git a/mos-platform/nes-slrom/CMakeLists.txt b/mos-platform/nes-slrom/CMakeLists.txt
@@ -0,0 +1 @@
+platform(nes-slrom COMPLETE PARENT nes-nrom)
diff --git a/mos-platform/nes-slrom/link.ld b/mos-platform/nes-slrom/link.ld
@@ -0,0 +1,103 @@
+/* NES SLROM iNES file linker script. */
+
+MEMORY {
+  /* CPU address space. */
+  ram (w)      : ORIGIN = 0x0200, LENGTH = 0x0600
+
+  /* PRG-ROM VMAs. */
+  prg_rom_lo : ORIGIN = 0x8000, LENGTH = 0x4000
+  prg_rom_hi : ORIGIN = 0xc000, LENGTH = 0x4000
+
+  /* CHR-ROM VMAs. */
+  chr_rom_lo : ORIGIN = 0x0000, LENGTH = 0x1000
+  chr_rom_hi : ORIGIN = 0x1000, LENGTH = 0x1000
+
+  /* PRG-ROM LMA. 256 Kib. */
+  prg_rom : ORIGIN = 0x10000, LENGTH = 0x40000
+
+  /* PRG-ROM Bank 15 LMA; accessible at startup. */
+  prg_rom_15 (rx) : ORIGIN = 0x4c000, LENGTH = 0x4000
+
+  /* CHR-ROM LMA. 128 Kib. */
+  chr_rom : ORIGIN = 0x50000, LENGTH = 0x20000
+}
+
+SECTIONS {
+  /* Code must be loadable at startup, which means PRG-ROM page 15. Code may be
+   * placed in other pages, but this must be done manually. */
+  .text : { INCLUDE text-sections.ld } >prg_rom_hi AT>prg_rom_15
+  .rodata : { INCLUDE rodata-sections.ld } >prg_rom_hi AT>prg_rom_15
+  /* The data segment is loaded from PRG-ROM page 15, but used in RAM. */
+  .data : { INCLUDE data-sections.ld } AT>prg_rom_15
+  INCLUDE data-symbols.ld
+  INCLUDE bss.ld
+  INCLUDE noinit.ld
+
+  .vector 0xfffa - ORIGIN(prg_rom_hi) + ORIGIN(prg_rom_15) : {
+    SHORT(nmi) SHORT(_start) SHORT(irq)
+  } >prg_rom_15
+}
+
+INCLUDE nes-imag-regs.ld
+
+OUTPUT_FORMAT {
+  INCLUDE ines-header.ld
+
+  /* PRG-ROM size LSB. */
+  BYTE(16)
+
+  /* CHR-ROM size LSB. */
+  BYTE(16)
+
+  /* Flags 6:
+  *   Mapper 0
+  *   No hard-wired four-screen mode.
+  *   No trainer.
+  *   No battery.
+  *   No hard-wired mirroring.
+  */
+  BYTE(0)
+
+  /* Flags 7:
+  *   Mapper 1.
+  *   NES 2.0 identifier.
+  *   NES/Family Computer console type.
+  */
+  BYTE(1 << 4 | 2 << 2 | 0)
+
+  /* Mapper MSB/Submapper:
+  *   Submapper 0.
+  *   Mapper MSB 0.
+  */
+  BYTE(0)
+
+  /* PRG-ROM/CHR-ROM size MSB (counting by 8K) */
+  BYTE(0)
+
+  /* PRG-RAM/EEPROM size
+  *   No PRG-RAM.
+  *   No PRG-EEPROM.
+  */
+  BYTE(0)
+
+  /* CHR-RAM/NVRAM size
+  *   No CHR-RAM.
+  *   No CHR-NVRAM.
+  */
+  BYTE(0)
+
+  /* CPU/PPU Timing */
+  BYTE(__timing)
+
+  /* VS system type/Extended Console Type: N/A */
+  BYTE(0)
+
+  /* Miscellaneous ROMs: 0 */
+  BYTE(0)
+
+  /* Default Expansion Device: N/A */
+  BYTE(0)
+
+  FULL(prg_rom)
+  FULL(chr_rom)
+}

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+__bss_start = .;`
	`2`	`+(.bss .bss. COMMON)`
	`3`	`+__bss_end = .;`
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+__data_start = .;`
	`2`	`+(.data .data.)`
	`3`	`+__data_end = .;`
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+__data_load_start = LOADADDR(.data);`
	`2`	`+__data_size = SIZEOF(.data);`