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ati-vga: Fix indexed access to video memory

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Coverity (CID 1399700) found that this was wrong so instead of trying
to do it by hand use existing access functions that should work better.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-id: 20190318223842.427CB7456B2@zero.eik.bme.hu
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
BALATON Zoltan 2019-03-18 23:34:46 +01:00 • committed by Gerd Hoffmann
parent ab8789987f
commit 339534d402
1 changed files with 6 additions and 12 deletions
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18
hw/display/ati.c
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@ -235,12 +235,9 @@ static uint64_t ati_mm_read(void *opaque, hwaddr addr, unsigned int size)
case MM_DATA ... MM_DATA + 3:
/* indexed access to regs or memory */
if (s->regs.mm_index & BIT(31)) {
if (s->regs.mm_index <= s->vga.vram_size - size) {
int i = size - 1;
while (i >= 0) {
val <<= 8;
val |= s->vga.vram_ptr[s->regs.mm_index + i--];
}
uint32_t idx = s->regs.mm_index & ~BIT(31);
if (idx <= s->vga.vram_size - size) {
val = ldn_le_p(s->vga.vram_ptr + idx, size);
}
} else {
val = ati_mm_read(s, s->regs.mm_index + addr - MM_DATA, size);
@ -434,12 +431,9 @@ static void ati_mm_write(void *opaque, hwaddr addr,
case MM_DATA ... MM_DATA + 3:
/* indexed access to regs or memory */
if (s->regs.mm_index & BIT(31)) {
if (s->regs.mm_index <= s->vga.vram_size - size) {
int i = 0;
while (i < size) {
s->vga.vram_ptr[s->regs.mm_index + i] = data & 0xff;
data >>= 8;
}
uint32_t idx = s->regs.mm_index & ~BIT(31);
if (idx <= s->vga.vram_size - size) {
stn_le_p(s->vga.vram_ptr + idx, size, data);
}
} else {
ati_mm_write(s, s->regs.mm_index + addr - MM_DATA, data, size);