From d4279640e3739ee58fade392f9c442cae0dfc71f Mon Sep 17 00:00:00 2001 From: notaz Date: Tue, 7 Apr 2009 22:43:37 +0000 Subject: [PATCH] finish safety stuff --- hexed/hexed.s | 209 ++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 179 insertions(+), 30 deletions(-) diff --git a/hexed/hexed.s b/hexed/hexed.s index ba9de49..6ecbab2 100644 --- a/hexed/hexed.s +++ b/hexed/hexed.s @@ -7,6 +7,7 @@ .text .globl main +.globl INT .globl VBL ################################################## @@ -168,6 +169,8 @@ colors: dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 dc.w 0x0000,0x0e44,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 + dc.w 0x0000,0x044e,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 + dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 colors_end: @@ -178,14 +181,16 @@ sprite_data_end: predef_addrs: dc.l 0x000000, 0x200000, 0x400000, 0xa00000, 0xa10000 - dc.l 0xa11100, 0xa12000, 0xa13000, 0xc00000 + dc.l 0xa11100, 0xa12000, 0xa13000, 0xa14000, 0xc00000 predef_addrs_end: safe_addrs: dc.l 0x000000, 0x7fffff dc.l 0xe00000, 0xffffff - dc.l 0xa00000, 0xa163ff /* FIXME */ - /* TODO: VDP */ + dc.l 0xa00000, 0xa100ff + dc.l 0xa11000, 0xa113ff + dc.l 0xa12000, 0xa120ff + dc.l 0xa13000, 0xa130ff safe_addrs_end: txt_edit: @@ -200,6 +205,10 @@ txt_goto_predef: .ascii "Go to (predef)\0" txt_dtack: .ascii "DTACK safety\0" +txt_dtack_err: + .ascii "DTACK err?\0" +txt_exc: + .ascii "Exception \0" ################################################## # # @@ -294,6 +303,15 @@ lmaploop0: 0: move.l (a1)+,(a0) dbra d3,0b + /* wait for vsync before unmask */ + move.l #GFXCNTL,a3 +0: + move.w (a3),d0 + and.b #8,d0 + nop + nop + beq 0b + move.w #0x2000,sr ################################################## @@ -303,6 +321,17 @@ forever: bra forever +INT: + /* let's hope VRAM is already set up.. */ + lea txt_exc,a0 + move.l #9,d0 + move.l #27,d1 + move.l #0xe000,d2 + jsr print + bra forever + +################################################## + VBL: addq.b #1,d7 movem.l d0-d4/a0-a5,-(a7) @@ -326,7 +355,14 @@ jumptab: ##################### main ####################### mode_main: - clr.l d1 + /* assume we will hang */ + lea txt_dtack_err,a0 + move.l #9,d0 + move.l #27,d1 + move.l #0xe000,d2 + jsr print + + moveq.l #0,d1 move.l a6,d0 move.b d0,d1 lsr.l #8,d0 @@ -356,20 +392,41 @@ draw_row: btst.l #4,d6 bne draw_row_safe - bsr is_addr_safe - bne draw_row_safe + bsr get_safety_mask + cmp.b #0xf,d0 + beq draw_row_safe -# draw unreadable areas +# unsafe or partially safe +draw_row_hsafe: + move.l d0,d4 + swap d4 /* mask in upper word */ btst.l #15,d7 - bne draw_row_unsafe_words + bne draw_row_hsafe_words_pre -draw_row_unsafe_bytes: +draw_row_hsafe_bytes_pre: /* 8 bytes */ - moveq.l #8-1,d4 -0: + moveq.l #2,d3 + move.w #3,d4 + +draw_row_hsafe_bytes: move.w #' ',(a0) + move.b d4,d0 + add.b #16,d0 + btst.l d0,d4 + bne 0f move.l #'?'|('?'<<16),(a0) - dbra d4,0b + move.w #' ',(a0) + move.l #'?'|('?'<<16),(a0) + bra 1f +0: + move.b (0,a1),d2 + jsr print_hex_preped + move.w #' ',(a0) + move.b (1,a1),d2 + jsr print_hex_preped +1: + addq.l #2,a1 + dbra d4,draw_row_hsafe_bytes move.w #' ',(a0) @@ -377,16 +434,28 @@ draw_row_unsafe_bytes: swap d0 cmp.w d5,d0 beq draw_cursor_unsafe_byte - bra draw_chars_unsafe + bra draw_chars_hsafe_pre -draw_row_unsafe_words: +draw_row_hsafe_words_pre: /* 4 shorts */ - moveq.l #4-1,d4 -0: + moveq.l #4,d3 + move.w #3,d4 + +draw_row_hsafe_words: move.w #' ',(a0) + move.b d4,d0 + add.b #16,d0 + btst.l d0,d4 + bne 0f move.l #'?'|('?'<<16),(a0) move.l #'?'|('?'<<16),(a0) - dbra d4,0b + bra 1f +0: + move.w (a1),d2 + jsr print_hex_preped +1: + addq.l #2,a1 + dbra d4,draw_row_hsafe_words move.l #(' '<<16)|' ',(a0) @@ -395,14 +464,52 @@ draw_row_unsafe_words: cmp.w d5,d0 beq draw_cursor_unsafe_word -draw_chars_unsafe: - move.l #'?'|('?'<<16),(a0) - move.l #'?'|('?'<<16),(a0) - move.l #'?'|('?'<<16),(a0) +draw_chars_hsafe_pre: + subq.l #8,a1 + move.w #3,d4 + moveq.l #0,d0 + +draw_chars_hsafe: + move.b d4,d0 + add.b #16,d0 + btst.l d0,d4 + bne 0f move.l #'?'|('?'<<16),(a0) + bra draw_chars_hsafe_next +0: + btst.l #15,d7 /* must perform correct read type */ + bne 0f /* doing byte reads on security reg hangs */ + move.b (0,a1),d0 + lsl.l #8,d0 + move.b (1,a1),d0 + bra 1f +0: + move.w (a1),d0 +1: + ror.l #8,d0 + move.b d0,d1 + sub.b #0x20,d1 + cmp.b #0x60,d1 + blo 0f + move.b #'.',d0 +0: + move.w d0,(a0) + + move.b #0,d0 + rol.l #8,d0 + move.b d0,d1 + sub.b #0x20,d1 + cmp.b #0x60,d1 + blo 0f + move.b #'.',d0 +0: + move.w d0,(a0) + +draw_chars_hsafe_next: + addq.l #2,a1 + dbra d4,draw_chars_hsafe move.l #(' '<<16)|' ',(a0) - addq.l #8,a1 add.w #0x80,a2 dbra d5,draw_row bra draw_status_bar @@ -468,6 +575,7 @@ draw_chars: add.w #0x80,a2 dbra d5,draw_row + draw_status_bar: /* status bar */ move.l a2,a0 @@ -480,7 +588,14 @@ draw_status_bar: mk_a6_addr d2 move.l #0x4006,d3 jsr print_hex_preped - move.w #' ',(a0) + + /* clear error */ + moveq.l #5-1,d0 +0: + move.l #' '|(' '<<16),(a0) + move.l #' '|(' '<<16),(a0) + dbra d0,0b + /* handle input */ jsr get_input /* x0cbrldu x1sa00du */ @@ -563,7 +678,7 @@ draw_cursor_unsafe_byte: move.l a2,a0 add.w #31*2,a0 jsr load_prepare /* restore a0 */ - jmp draw_chars_unsafe + jmp draw_chars_hsafe_pre draw_cursor_unsafe_word: move.l a6,d0 @@ -584,7 +699,7 @@ draw_cursor_unsafe_word: move.l a2,a0 add.w #29*2,a0 jsr load_prepare /* restore a0 */ - jmp draw_chars_unsafe + jmp draw_chars_hsafe_pre draw_cursor_byte: @@ -1080,10 +1195,10 @@ init_gfx: rts -# determine if address packed in a6 is safe +# get mask of bits representing safe words # a1 - address to check # destroys d0-d2, strips upper bits from a1 -is_addr_safe: +get_safety_mask: move.l a1,d1 lsl.l #8,d1 lsr.l #8,d1 @@ -1100,14 +1215,48 @@ is_addr_safe: addq.l #4,a1 dbra d2,0b -addr_unsafe: move.l d1,a1 - moveq.l #0,d0 + + moveq.l #0x0c,d0 + cmp.l #0xa14000,d1 + beq gsm_rts + + moveq.l #0x08,d0 + cmp.l #0xa14100,d1 + beq gsm_rts + + /* check for VDP address */ + move.l d1,d0 + swap d0 + and.b #0xe0,d0 + cmp.b #0xc0,d0 + bne addr_unsafe /* not vdp */ + + move.l d1,d0 + and.l #0x0700e0,d0 + bne addr_unsafe + + move.l d1,d0 + and.b #0x1f,d0 + cmp.b #0x04,d0 + blt addr_hsafe_3 /* data port */ + cmp.b #0x10,d0 + blt addr_safe /* below PSG */ + cmp.b #0x18,d0 + bge addr_safe /* above PSG */ + +addr_unsafe: + moveq.l #0,d0 /* skip line */ + rts + +addr_hsafe_3: + moveq.l #3,d0 /* skip 2 words */ rts addr_safe: move.l d1,a1 - moveq.l #1,d0 + moveq.l #0xf,d0 +gsm_rts: rts -- 2.39.5