add syscalls

CMakeLists.txt

@@ -3,7 +3,7 @@
 
 cmake_minimum_required(VERSION 3.18)
 # replace this with your project's name
-project(unshell C)
+project(unshell C ASM)
 
 include(GenerateG1A)
 include(GenerateG3A)
@@ -18,6 +18,7 @@ set(SOURCES
 	src/main.c
   src/term.c
   src/ui.c
+  src/syscalls.S
 	# ...
 )
 # shared assets
@@ -66,6 +67,9 @@ set(FLAGS
 	-Os
 )
 
+set(ASM_OPTIONS "-x assembler-with-cpp")
+set(CMAKE_ASM_FLAGS "${ASM_OPTIONS}")
+
 fxconv_declare_assets(${ASSETS} ${ASSETS_fx} ${ASSETS_cg} WITH_METADATA)
 
 add_executable(Main ${SOURCES} ${ASSETS} ${ASSETS_${FXSDK_PLATFORM}})

src/syscalls.S

@@ -0,0 +1,36 @@
+.global __poweroff
+.global __battery
+.global __battery_type
+
+.section ".text"
+
+#define syscall(id)              \
+	mov.l syscall_table, r2	    ;\
+	mov.l 1f,            r0     ;\
+	jmp	  @r2                   ;\
+	nop                         ;\
+.align 4                        ;\
+1: .long id
+
+#ifdef FX9860G
+
+syscall_table:
+	.long	0x80010070
+
+#endif /* FX9860G */
+
+#ifdef FXCG50
+
+__poweroff:
+	syscall(0x1839)
+
+__battery:
+	syscall(0x1186)
+
+__battery_type:
+	syscall(0x12d5)
+
+syscall_table:
+	.long	0x80020070
+
+#endif /* FXCG50 */