X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=megaed-sv%2Fsega_gcc.s;h=897acdfa1f43088fdcd51e1281f2502cccd4ddaf;hb=8d788f3de66aeda55c2518b5e511111face3a82a;hp=42e3d5f6c4d4a6949c88c1963e585282bde24bc2;hpb=ab6ed3c49797791b2cfd90f4f636e7489355d02b;p=megadrive.git

diff --git a/megaed-sv/sega_gcc.s b/megaed-sv/sega_gcc.s
index 42e3d5f..897acdf 100644
--- a/megaed-sv/sega_gcc.s
+++ b/megaed-sv/sega_gcc.s
@@ -1,44 +1,60 @@
-        dc.l 0x0,0x200
-        dc.l INT,INT,INT,INT,INT,INT,INT
-        dc.l INT,INT,INT,INT,INT,INT,INT,INT
-        dc.l INT,INT,INT,INT,INT,INT,INT,INT
-        dc.l INT,INT,INT,HBL,INT,VBL,INT,INT
-        dc.l INT,INT,INT,INT,INT,INT,INT,INT
-        dc.l INT,INT,INT,INT,INT,INT,INT,INT
-        dc.l INT,INT,INT,INT,INT,INT,INT,INT
-        dc.l INT,INT,INT,INT,INT,INT,INT
-        .ascii "SEGA EVERDRIVE                  "
-        .ascii "MEGA-ED host                                    "
-        .ascii "MEGA-ED host                                    "
-        .ascii "GM 00000000-00"
-        .byte 0x00,0x00
-        .ascii "JD              "
-        .byte 0x00,0x00,0x00,0x00,0x00,0x02,0x00,0x00
-        .byte 0x00,0xff,0x00,0x00,0xff,0xff,0xff,0xff
-        .ascii "               "
-        .ascii "                        "
-        .ascii "                         "
-        .ascii "JUE             "
+exc_tab:
+    dc.l     0, 0x200, exc02, exc03, exc04, exc05, exc06, exc07
+    dc.l exc08, exc09, exc0a, exc0b, exc0c, exc0d, exc0e, exc0f
+    dc.l exc10, exc11, exc12, exc13, exc14, exc15, exc16, exc17
+    dc.l exc18, exc19, exc1a, exc1b, HBL,   exc1d, VBL,   exc1f
+    dc.l exc20, exc21, exc22, exc23, exc24, exc25, exc26, exc27
+    dc.l exc28, exc29, exc2a, exc2b, exc2c, exc2d, exc2e, exc2f
+    dc.l exc30, exc31, exc32, exc33, exc34, exc35, exc3e, exc37
+    dc.l exc38, exc39, exc3a, exc3b, exc3c, exc3d, exc3e, exc3f
+
+    .ascii "SEGA EVERDRIVE                  "
+    .ascii "MEGA-ED host                                    "
+    .ascii "MEGA-ED host                                    "
+    .ascii "GM 00000000-00"
+    .byte 0x00,0x00
+    .ascii "JD              "
+    .byte 0x00,0x00,0x00,0x00,0x00,0x02,0x00,0x00
+    .byte 0x00,0xff,0x00,0x00,0xff,0xff,0xff,0xff
+    .ascii "               "
+    .ascii "                        "
+    .ascii "                         "
+    .ascii "JUE             "
 
-/* magic ED app init */
 RST:
+	move.w      (0xc00008), start_hvc
+	move.w		#0x2700, %sr
+/* magic ED app init */
 	move.w #0x0000, (0xA13006)
 	jmp init_ed.l
 init_ed:
-	move.w #0x210f, (0xA13006)
-	move.l #HBL, (0x70)
-	move.l #VBL, (0x78)
+/* relocate to bank a, so that other ROMs can be loaded */
+	move.w #0x0a0f, (0xA13006)
+	movea.l #0x100000, %a0
+	movea.l #0x200000, %a1
+	move.l #0x100000/4/4-1, %d0
+0:
+	move.l (a0)+, (a1)+
+	move.l (a0)+, (a1)+
+	move.l (a0)+, (a1)+
+	move.l (a0)+, (a1)+
+	dbra %d0, 0b
 
-	moveq   #0,%d0
-	movea.l %d0,%a7
-	move    %a7,%usp
-	bra     main
+	move.w #0x10af, (0xA13006)
 
-INT:
-	movem.l %d0-%d1/%a0-%a1,-(%sp)
-	jsr exception
-	movem.l (%sp)+,%d0-%d1/%a0-%a1
-	rte
+	lea exc_tab, %a0
+	adda.l #4*2, %a0
+	movea.l #4*2, %a1
+	move.l #64-2-1, %d0
+0:
+	move.l (a0)+, (a1)+
+	dbra %d0, 0b
+
+	moveq   #0, %d0
+	movea.l %d0, %a7
+	move    %a7, %usp
+	move.w  #0x2000, %sr
+	bra     main
 
 HBL:
 	rte
@@ -49,6 +65,15 @@ VBL:
 	movem.l (%sp)+,%d0-%d1/%a0-%a1
 	rte
 
+pre_exception:
+	move.w  #0x2700, %sr
+	movem.l %d0-%d7/%a0-%a7,-(%sp)
+	move.l %sp, %d0
+	move.l %d0,-(%sp)
+	jsr exception
+0:
+	bra 0b
+
 
 * Standard 32X startup code for MD side at 0x3F0
 	.org 0x3F0
@@ -119,3 +144,79 @@ VBL:
         .word   0xFFC0,0x4CD6,0x7FF9,0x44FC,0x0000,0x6014,0x43F9,0x00A1
         .word   0x5100,0x3340,0x0006,0x303C,0x8000,0x6004,0x44FC,0x0001
 
+.macro exc_stub num
+exc\num:
+	move.w #0x\num, -(%sp)
+	jmp pre_exception
+.endm
+
+exc_stub 02
+exc_stub 03
+exc_stub 04
+exc_stub 05
+exc_stub 06
+exc_stub 07
+exc_stub 08
+exc_stub 09
+exc_stub 0a
+exc_stub 0b
+exc_stub 0c
+exc_stub 0d
+exc_stub 0e
+exc_stub 0f
+exc_stub 10
+exc_stub 11
+exc_stub 12
+exc_stub 13
+exc_stub 14
+exc_stub 15
+exc_stub 16
+exc_stub 17
+exc_stub 18
+exc_stub 19
+exc_stub 1a
+exc_stub 1b
+# exc_stub 1c
+exc_stub 1d
+# exc_stub 1e
+exc_stub 1f
+exc_stub 20
+exc_stub 21
+exc_stub 22
+exc_stub 23
+exc_stub 24
+exc_stub 25
+exc_stub 26
+exc_stub 27
+exc_stub 28
+exc_stub 29
+exc_stub 2a
+exc_stub 2b
+exc_stub 2c
+exc_stub 2d
+exc_stub 2e
+exc_stub 2f
+exc_stub 30
+exc_stub 31
+exc_stub 32
+exc_stub 33
+exc_stub 34
+exc_stub 35
+exc_stub 36
+exc_stub 37
+exc_stub 38
+exc_stub 39
+exc_stub 3a
+exc_stub 3b
+exc_stub 3c
+exc_stub 3d
+exc_stub 3e
+exc_stub 3f
+
+.bss
+.align 2
+.global start_hvc
+start_hvc:
+    .word 0
+
+# vim:filetype=asmM68k:ts=4:sw=4:expandtab