From ee880802c8fad0e05767f5470cd4d3697331d77f Mon Sep 17 00:00:00 2001
From: TuxSH <tuxsh@sfr.fr>
Date: Fri, 19 May 2017 21:56:20 +0200
Subject: [PATCH] Fix crt0 & include missing files

---
 loader/source/firm.c | 44 ++++++++++++++++++++++++++++++++++++++++++
 loader/source/firm.h | 46 ++++++++++++++++++++++++++++++++++++++++++++
 source/start.s       |  8 +++++---
 3 files changed, 95 insertions(+), 3 deletions(-)
 create mode 100644 loader/source/firm.c
 create mode 100644 loader/source/firm.h

diff --git a/loader/source/firm.c b/loader/source/firm.c
new file mode 100644
index 0000000..c336876
--- /dev/null
+++ b/loader/source/firm.c
@@ -0,0 +1,44 @@
+/*
+*   This file is part of Luma3DS
+*   Copyright (C) 2017 Aurora Wright, TuxSH
+*
+*   This program is free software: you can redistribute it and/or modify
+*   it under the terms of the GNU General Public License as published by
+*   the Free Software Foundation, either version 3 of the License, or
+*   (at your option) any later version.
+*
+*   This program is distributed in the hope that it will be useful,
+*   but WITHOUT ANY WARRANTY; without even the implied warranty of
+*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*   GNU General Public License for more details.
+*
+*   You should have received a copy of the GNU General Public License
+*   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+*   Additional Terms 7.b of GPLv3 applies to this file: Requiring preservation of specified
+*   reasonable legal notices or author attributions in that material or in the Appropriate Legal
+*   Notices displayed by works containing it.
+*/
+
+#include "firm.h"
+#include "memory.h"
+#include "cache.h"
+
+void launchFirm(Firm *firm, int argc, char **argv)
+{
+
+    //Copy FIRM sections to respective memory locations
+    for(u32 sectionNum = 0; sectionNum < 4 && firm->section[sectionNum].size != 0; sectionNum++)
+        memcpy(firm->section[sectionNum].address, (u8 *)firm + firm->section[sectionNum].offset, firm->section[sectionNum].size);
+
+    //Set ARM11 entrypoint
+    *(vu32 *)0x1FFFFFFC = (u32)firm->arm11Entry;
+
+    //Ensure that all memory transfers have completed and that the caches have been flushed
+    flushCaches();
+
+    //Jump to ARM9 entrypoint. Also give it additional arguments it can dismiss
+    ((void (*)(int, char**, u32))firm->arm9Entry)(argc, argv, 0x0000BEEF);
+
+    __builtin_unreachable();
+}
diff --git a/loader/source/firm.h b/loader/source/firm.h
new file mode 100644
index 0000000..47dc7ba
--- /dev/null
+++ b/loader/source/firm.h
@@ -0,0 +1,46 @@
+/*
+*   This file is part of Luma3DS
+*   Copyright (C) 2017 Aurora Wright, TuxSH
+*
+*   This program is free software: you can redistribute it and/or modify
+*   it under the terms of the GNU General Public License as published by
+*   the Free Software Foundation, either version 3 of the License, or
+*   (at your option) any later version.
+*
+*   This program is distributed in the hope that it will be useful,
+*   but WITHOUT ANY WARRANTY; without even the implied warranty of
+*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*   GNU General Public License for more details.
+*
+*   You should have received a copy of the GNU General Public License
+*   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+*   Additional Terms 7.b of GPLv3 applies to this file: Requiring preservation of specified
+*   reasonable legal notices or author attributions in that material or in the Appropriate Legal
+*   Notices displayed by works containing it.
+*/
+
+#pragma once
+
+#include "types.h"
+
+typedef struct __attribute__((packed))
+{
+    u32 offset;
+    u8 *address;
+    u32 size;
+    u32 procType;
+    u8 hash[0x20];
+} FirmSection;
+
+typedef struct __attribute__((packed))
+{
+    char magic[4];
+    u32 reserved1;
+    u8 *arm11Entry;
+    u8 *arm9Entry;
+    u8 reserved2[0x30];
+    FirmSection section[4];
+} Firm;
+
+void launchFirm(Firm *firm, int argc, char **argv);
diff --git a/source/start.s b/source/start.s
index 2a05828..39dea1c 100644
--- a/source/start.s
+++ b/source/start.s
@@ -33,6 +33,9 @@ _start:
     cmp r2, r4
     movne r0, #0    @ check magic word
 
+    mov r9, r0
+    mov r10, r1
+
     @ Change the stack pointer
     mov sp, #0x27000000
 
@@ -47,8 +50,6 @@ _start:
     bl flushEntireDCache
     bl flushEntireICache
 
-    push {r0-r3}
-
     @ Give read/write access to all the memory regions
     ldr r0, =0x3333333
     mcr p15, 0, r0, c5, c0, 2 @ write data access
@@ -97,5 +98,6 @@ _start:
     sub r2, r0
     bl memset32
 
-    pop {r0-r3}
+    mov r0, r9
+    mov r1, r10
     b main