Merged linker scripts and bootstrapping code

Makefile

@@ -21,7 +21,7 @@ ifeq ($(MODE),safe)
 	export TARGET	:=	SafeMode9
 endif
 BUILD		:=	build
-SOURCES		:=	source source/common source/fs source/crypto source/fatfs source/nand source/virtual source/game source/gamecart source/abstraction
+SOURCES		:=	source source/common source/fs source/crypto source/fatfs source/nand source/virtual source/game source/gamecart
 DATA		:=	data
 INCLUDES	:=	source source/common source/font source/fs source/crypto source/fatfs source/nand source/virtual source/game source/gamecart
 
@@ -30,7 +30,7 @@ INCLUDES	:=	source source/common source/font source/fs source/crypto source/fatf
 #---------------------------------------------------------------------------------
 ARCH	:=	-mthumb -mthumb-interwork -flto
 
-CFLAGS	:=	-g -Wall -Wextra -Wpedantic -Wcast-align -Wno-misleading-identation -O2\
+CFLAGS	:=	-g -Wall -Wextra -Wpedantic -Wcast-align -Wno-main -O2\
 			-march=armv5te -mtune=arm946e-s -fomit-frame-pointer -ffast-math -std=gnu99\
 			$(ARCH)
 
@@ -57,13 +57,7 @@ endif
 CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions
 
 ASFLAGS	:=	-g $(ARCH) -DEXEC_$(EXEC_METHOD)
-LDFLAGS	=	-nostartfiles -g $(ARCH) -Wl,-Map,$(TARGET).map
+LDFLAGS	=	-T../link.ld -nostartfiles -g $(ARCH) -Wl,-Map,$(TARGET).map
-
-ifeq ($(EXEC_METHOD),GATEWAY)
-	LDFLAGS += --specs=../gateway.specs
-else ifeq ($(EXEC_METHOD),A9LH)
-	LDFLAGS += --specs=../a9lh.specs
-endif
 
 LIBS	:=
 
@@ -120,7 +114,7 @@ export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)
 .PHONY: common clean all gateway a9lh cakehax cakerop brahma release
 
 #---------------------------------------------------------------------------------
-all: a9lh
+all: binary
 
 common:
 	@[ -d $(OUTPUT_D) ] || mkdir -p $(OUTPUT_D)
@@ -129,14 +123,11 @@ common:
 submodules:
 	@-git submodule update --init --recursive
 
-gateway: common
+binary: common
-	@make --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile EXEC_METHOD=GATEWAY
+	@make --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
 	@cp resources/LauncherTemplate.dat $(OUTPUT_D)/Launcher.dat
 	@dd if=$(OUTPUT).bin of=$(OUTPUT_D)/Launcher.dat bs=1497296 seek=1 conv=notrunc
 
-a9lh: common
-	@make --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile EXEC_METHOD=A9LH
-
 cakehax: submodules common
 	@make --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile EXEC_METHOD=GATEWAY
 	@make dir_out=$(OUTPUT_D) name=$(TARGET).dat -C CakeHax bigpayload

a9lh.specs

@@ -1,5 +0,0 @@
-%rename link                old_link
-
-*link:
-%(old_link) -T ../a9lh.ld%s
-

gateway.ld

@@ -1,16 +0,0 @@
-OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
-OUTPUT_ARCH(arm)
-ENTRY(_start)
-
-SECTIONS
-{
-    . = 0x08000000;
-
-    .text       : ALIGN(4) { *(.text.start) *(.text*) }
-    .rodata     : ALIGN(4) { *(.rodata*) }
-    .data       : ALIGN(4) { *(.data*) }
-    .bss        : ALIGN(4) { __bss_start = .; *(.bss* COMMON); __bss_end = .;}
-
-    . = ALIGN(4);
-    __end__ = ABSOLUTE(.);
-}

gateway.specs

@@ -1,5 +0,0 @@
-%rename link                old_link
-
-*link:
-%(old_link) -T ../gateway.ld%s
-

link.ld

@@ -6,11 +6,13 @@ SECTIONS
 {
     . = 0x23F00000;
 
-    .text       : ALIGN(4) { *(.text.start) *(.text*) }
+    .text.start : ALIGN(4) { *(.text.start) }
+    .text       : ALIGN(4) { *(.text*) }
     .rodata     : ALIGN(4) { *(.rodata*) }
     .data       : ALIGN(4) { *(.data*) }
     .bss        : ALIGN(4) { __bss_start = .; *(.bss* COMMON); __bss_end = .;}
 
     . = ALIGN(4);
+
     __end__ = ABSOLUTE(.);
 }

source/abstraction/a9-start.s

@@ -1,85 +0,0 @@
-#ifdef EXEC_A9LH
-
-.section .text.start
-.align 4
-.global _start
-_start:
-    @ Change the stack pointer
-    mov sp, #0x27000000
-
-    @ Disable caches / mpu
-    mrc p15, 0, r4, c1, c0, 0  @ read control register
-    bic r4, #(1<<12)           @ - instruction cache disable
-    bic r4, #(1<<2)            @ - data cache disable
-    bic r4, #(1<<0)            @ - mpu disable
-    mcr p15, 0, r4, c1, c0, 0  @ write control register
-    
-    @ Clear bss
-    ldr r0, =__bss_start
-    ldr r1, =__bss_end
-    mov r2, #0
-
-    .bss_clr:
-    cmp r0, r1
-    beq .bss_clr_done
-    str r2, [r0], #4
-    b .bss_clr
-    .bss_clr_done:
-    
-    @ Give read/write access to all the memory regions
-    ldr r5, =0x33333333
-    mcr p15, 0, r5, c5, c0, 2 @ write data access
-    mcr p15, 0, r5, c5, c0, 3 @ write instruction access
-
-    @ Sets MPU permissions and cache settings
-    ldr r0, =0xFFFF001F	@ ffff0000 64k  | bootrom (unprotected / protected)
-    ldr r1, =0x3000801B	@ 30000000 16k  | dtcm
-    ldr r2, =0x01FF801D	@ 01ff8000 32k  | itcm
-    ldr r3, =0x08000029	@ 08000000 2M   | arm9 mem (O3DS / N3DS) 
-    ldr r4, =0x10000029	@ 10000000 2M   | io mem (ARM9 / first 2MB)
-    ldr r5, =0x20000037	@ 20000000 256M | fcram (O3DS / N3DS)
-    ldr r6, =0x1FF00027	@ 1FF00000 1M   | dsp / axi wram
-    ldr r7, =0x1800002D	@ 18000000 8M   | vram (+ 2MB)
-    mov r8, #0x2D
-    mcr p15, 0, r0, c6, c0, 0
-    mcr p15, 0, r1, c6, c1, 0
-    mcr p15, 0, r2, c6, c2, 0
-    mcr p15, 0, r3, c6, c3, 0
-    mcr p15, 0, r4, c6, c4, 0
-    mcr p15, 0, r5, c6, c5, 0
-    mcr p15, 0, r6, c6, c6, 0
-    mcr p15, 0, r7, c6, c7, 0
-    mcr p15, 0, r8, c3, c0, 0	@ Write bufferable 0, 2, 5
-    mcr p15, 0, r8, c2, c0, 0	@ Data cacheable 0, 2, 5
-    mcr p15, 0, r8, c2, c0, 1	@ Inst cacheable 0, 2, 5
-
-    @ Enable dctm
-    ldr r1, =0x3000800A        @ set dtcm
-    mcr p15, 0, r1, c9, c1, 0  @ set the dtcm Region Register
-    
-    @ Enable caches
-    mrc p15, 0, r4, c1, c0, 0  @ read control register
-    orr r4, r4, #(1<<18)       @ - itcm enable
-    orr r4, r4, #(1<<16)       @ - dtcm enable
-    orr r4, r4, #(1<<12)       @ - instruction cache enable
-    orr r4, r4, #(1<<2)        @ - data cache enable
-    orr r4, r4, #(1<<0)        @ - mpu enable
-    mcr p15, 0, r4, c1, c0, 0  @ write control register
-
-    @ Flush caches
-    mov r5, #0
-    mcr p15, 0, r5, c7, c5, 0  @ flush I-cache
-    mcr p15, 0, r5, c7, c6, 0  @ flush D-cache
-    mcr p15, 0, r5, c7, c10, 4 @ drain write buffer
-
-    @ Fixes mounting of SDMC
-    ldr r0, =0x10000020
-    mov r1, #0x340
-    str r1, [r0]
-
-    bl main
-
-.die:
-    b .die
-
-#endif // EXEC_A9LH

source/common/common.h

@@ -37,6 +37,9 @@
 #define align(v,a) \
     (((v) % (a)) ? ((v) + (a) - ((v) % (a))) : (v))
 
+#define ENTRY_BRAHMA        (1)
+#define ENTRY_GATEWAY       (2)
+    
 // GodMode9 version
 #define VERSION "0.9.9.4"
 

source/common/ui.h

@@ -21,7 +21,7 @@
 #define FONT_HEIGHT_EXT 8
 #endif
 
-#define RGB(r,g,b) (r<<24|b<<16|g<<8|r)
+#define RGB(r,g,b) ((r)<<24|(b)<<16|(g)<<8|(r))
 
 #define COLOR_BLACK         RGB(0x00, 0x00, 0x00)
 #define COLOR_WHITE         RGB(0xFF, 0xFF, 0xFF)
@@ -52,15 +52,8 @@
 #define COLOR_STD_BG        COLOR_BLACK
 #define COLOR_STD_FONT      COLOR_WHITE
 
-#ifdef EXEC_GATEWAY
+#define TOP_SCREEN          (u8*)(*(u32*)0x23FFFE00)
-	#define TOP_SCREEN (u8*)(*(u32*)((uint32_t)0x080FFFC0 + 4 * (*(u32*)0x080FFFD8 & 1)))
+#define BOT_SCREEN          (u8*)(*(u32*)0x23FFFE08)
-	#define BOT_SCREEN (u8*)(*(u32*)((uint32_t)0x080FFFD0 + 4 * (*(u32*)0x080FFFDC & 1)))
-#elif defined(EXEC_A9LH)
-	#define TOP_SCREEN (u8*)(*(u32*)0x23FFFE00)
-	#define BOT_SCREEN (u8*)(*(u32*)0x23FFFE08)
-#else
-	#error "Unknown execution method"
-#endif
 
 void ClearScreen(unsigned char *screen, int color);
 void ClearScreenF(bool clear_top, bool clear_bottom, int color);

source/fatfs/ff.c

@@ -4941,7 +4941,7 @@ FRESULT f_setlabel (
 	dj.obj.fs = fs;
 
 	/* Get length of given volume label */
-	for (slen = 0; (UINT)label[slen] >= ' '; slen++) ;	/* Get name length */
+	for (slen = 0; (UINT)label[slen] >= ' '; slen++) {}	/* Get name length */
 
 #if _FS_EXFAT
 	if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */

source/godmode.c

@@ -102,7 +102,7 @@ void DrawUserInterface(const char* curr_path, DirEntry* curr_entry, DirStruct* c
             (drvtype & DRV_CART) ? "Gamecart" : (drvtype & DRV_SEARCH) ? "Search" : ""),
             ((drvtype & DRV_FAT) ? " FAT" : (drvtype & DRV_VIRTUAL) ? " Virtual" : ""));
         ResizeString(tempstr, drvstr, 160 / FONT_WIDTH_EXT, 8, false);
-    }else {
+    } else {
         char numstr[32];
         char bytestr[32];
         FormatNumber(numstr, curr_entry->size);

source/main.c

@@ -17,10 +17,10 @@ void PowerOff()
 }
 
 
-int main()
+void main()
 {
     u32 godmode_exit = GodMode();
     ClearScreenF(true, true, COLOR_STD_BG);
     (godmode_exit == GODMODE_EXIT_REBOOT) ? Reboot() : PowerOff();
-    return 0;
+    return;
 }

source/start.s

@@ -1,42 +1,79 @@
-#ifdef EXEC_GATEWAY
-
 .section .text.start
 .global _start
 .align 4
 .arm
 
-_vectors:
+@ if the binary is booted from Brahma/CakeHax/k9lh
-    ldr pc, =InfiniteLoop
+@ the entrypoint is <start + 0x0>
-    .pool
+@ framebuffers are already set
-    ldr pc, =InfiniteLoop
-    .pool
-    ldr pc, =InfiniteLoop
-    .pool
-    ldr pc, =InfiniteLoop
-    .pool
-    ldr pc, =InfiniteLoop
-    .pool
-    ldr pc, =InfiniteLoop
-    .pool
-
 _start:
-    ldr sp,=0x22140000
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop @ dummy
+    b _skip_gw
+
+@ if the binary is booted from the GW exploit
+@ the entrypoint is <start + 0x30>
+_start_gw:
 
     @@wait for the arm11 kernel threads to be ready
-    ldr r1, =0x10000
+    mov r1, #0x10000
     waitLoop9:
         sub r1, #1
-
         cmp r1, #0
         bgt waitLoop9
 
-    ldr r1, =0x10000
+    mov r1, #0x10000
     waitLoop92:
         sub r1, #1
-
         cmp r1, #0
         bgt waitLoop92
 
+
+    @ copy the payload to the standard entrypoint (0x23F00000)
+    adr r0, _start
+    add r1, r0, #0x100000
+    ldr r2, .entry
+    .copy_binary_fcram:
+        cmp r0, r1
+        ldrlt r3, [r0], #4
+        strlt r3, [r2], #4
+        blt .copy_binary_fcram
+
+    @ setup framebuffers to look like Brahma/etc
+
+    ldr r0, .gw_fba
+    ldr r1, [r0, #0x18]
+    and r1, #1
+    ldr r1, [r0, r1, lsl #2] @ r1 := top framebuffer loc
+    mov r2, r1               @ r2 := top framebuffer loc
+
+    ldr r0, .gw_fbb
+    ldr r3, [r0, #0xC]
+    and r3, #1
+    ldr r3, [r0, r3, lsl #2] @ r3 := bottom framebuffer loc
+
+    ldr r0, .cakehax
+    stmia r0, {r1,r2,r3}
+    @ framebuffers properly set
+
+    ldr r3, .entry
+    bx r3
+
+.gw_fba:  .word 0x080FFFC0
+.gw_fbb:  .word 0x080FFFD0
+.cakehax: .word 0x23FFFE00
+.entry:   .word 0x23F00000
+
+_skip_gw:
     @ Disable caches / mpu
     mrc p15, 0, r4, c1, c0, 0  @ read control register
     bic r4, #(1<<12)           @ - instruction cache disable
@@ -46,15 +83,13 @@ _start:
 
     @ Clear bss
     ldr r0, =__bss_start
-    ldr r1, =__bss_end
+    ldr r1, =__end__
     mov r2, #0
 
     .bss_clr:
         cmp r0, r1
-    beq .bss_clr_done
+        strlt r2, [r0], #4
-    str r2, [r0], #4
+        blt .bss_clr
-    b .bss_clr
-    .bss_clr_done:
 
     @ Give read/write access to all the memory regions
     ldr r5, =0x33333333
@@ -107,12 +142,9 @@ _start:
     mov r1, #0x340
     str r1, [r0]
 
-    ldr sp, =0x22160000
+    mov sp, #0x27000000
-    ldr r3, =main
+
-    blx r3
+    blx main
+    b _start
+
 .pool
-
-InfiniteLoop:
-    b InfiniteLoop
-
-#endif // EXEC_GATEWAY