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svga_dm: prevent writing past the end of VRAM, should fix XF86_SVGA crashing. (no whatsnew)

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This commit is contained in:
mahlemiut 2014-05-03 10:08:37 +00:00
parent 89fea7921b
commit e4e63ad75d
1 changed files with 4 additions and 4 deletions
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8
src/emu/video/pc_vga.c
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@ -6038,9 +6038,9 @@ READ8_MEMBER(cirrus_vga_device::mem_r)
{
offset &= 0xffff;
if(gc_mode_ext & 0x20)
return vga.memory[(offset+gc_bank_0*0x4000)];
return vga.memory[(offset+gc_bank_0*0x4000) % vga.svga_intf.vram_size];
else
return vga.memory[(offset+gc_bank_0*0x1000)];
return vga.memory[(offset+gc_bank_0*0x1000) % vga.svga_intf.vram_size];
}
return vga_device::mem_r(space,offset,mem_mask);
@ -6052,9 +6052,9 @@ WRITE8_MEMBER(cirrus_vga_device::mem_w)
{
offset &= 0xffff;
if(gc_mode_ext & 0x20)
vga.memory[(offset+gc_bank_0*0x4000)] = data;
vga.memory[(offset+gc_bank_0*0x4000) % vga.svga_intf.vram_size] = data;
else
vga.memory[(offset+gc_bank_0*0x1000)] = data;
vga.memory[(offset+gc_bank_0*0x1000) % vga.svga_intf.vram_size] = data;
}
else
vga_device::mem_w(space,offset,data,mem_mask);