allow user configurable stack

libctru/source/system/ctru_exit.c

@@ -11,7 +11,7 @@ void __appExit();
 
 void __libc_fini_array(void);
 
-void __attribute__((weak)) __attribute__((noreturn)) __ctru_exit(int rc)
+void __attribute__((weak)) __attribute__((noreturn)) __libctru_exit(int rc)
 {
 	u32 tmp=0;
 

libctru/source/system/initSystem.c

@@ -18,7 +18,7 @@ void __libc_init_array(void);
 
 void __ctru_exit(int rc);
 
-void __attribute__((weak)) initSystem(void (*retAddr)(void))
+void __attribute__((weak)) __libctru_init(void (*retAddr)(void))
 {
 
 	// Register newlib exit() syscall

libctru/source/system/stack_adjust.s

@@ -0,0 +1,49 @@
+
+	.arm
+	.align 2
+
+	.global	initSystem
+	.type	initSystem,	%function
+
+initSystem:
+	ldr	r2, =saved_stack
+	str	sp, [r2]
+	str	lr, [r2,#4]
+
+	bl	__libctru_init
+
+	ldr	r2, =fake_heap_start
+	ldr	sp, [r2]
+
+	ldr	r3, =__stacksize__
+	ldr	r3, [r3]
+	add	sp, r3, #7
+	bics	sp, sp, #7
+	str	sp, [r2]
+
+	ldr	r2, =saved_stack
+	ldr	lr, [r2,#4]
+ 	bx	lr
+
+
+	.global	__ctru_exit
+	.type	__ctru_exit,	%function
+
+__ctru_exit:
+	ldr	r2, =saved_stack
+	ldr	sp, [r2]
+	b	__libctru_exit
+
+	.data
+	.align 2
+__stacksize__:
+	.word	32 * 1024
+	.weak	__stacksize__
+
+
+	.bss
+	.align 2
+saved_stack:
+	.space 8
+
+