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authorMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>2017-10-14 13:22:22 +0100
committerMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>2017-10-31 17:25:36 +0000
commit4ca3d368d2a66e6e0739fd1cb4552e68d060d337 (patch)
tree329774e9b810fd31a28f1c6e8c9c187f911aa280 /hw
parent6aa62ed6b8cef3623083b1a90cecfb854f7c4a79 (diff)
sparc32_dma: remove is_ledma hack and replace with memory region alias
This hack originated from before the memory region API was introduced, and increased the size of the ledma DMA device to capture incorrect accesses beyond the end of the ledma device. A full analysis can be found on Artyom's blog at http://tyom.blogspot.co.uk/2010/10/bug-in-all-solaris-versions-after-57.html. With the memory API we can now simply alias the incorrect access onto its intended destination allowing us to remove the hack. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Artyom Tarasenko <atar4qemu@gmail.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Diffstat (limited to 'hw')
-rw-r--r--hw/dma/sparc32_dma.c20
1 files changed, 6 insertions, 14 deletions
diff --git a/hw/dma/sparc32_dma.c b/hw/dma/sparc32_dma.c
index 582b7cc976..f64787e904 100644
--- a/hw/dma/sparc32_dma.c
+++ b/hw/dma/sparc32_dma.c
@@ -160,12 +160,6 @@ static uint64_t dma_mem_read(void *opaque, hwaddr addr,
DMADeviceState *s = opaque;
uint32_t saddr;
- if (s->is_ledma && (addr > DMA_MAX_REG_OFFSET)) {
- /* aliased to espdma, but we can't get there from here */
- /* buggy driver if using undocumented behavior, just return 0 */
- trace_sparc32_dma_mem_readl(addr, 0);
- return 0;
- }
saddr = (addr & DMA_MASK) >> 2;
trace_sparc32_dma_mem_readl(addr, s->dmaregs[saddr]);
return s->dmaregs[saddr];
@@ -177,11 +171,6 @@ static void dma_mem_write(void *opaque, hwaddr addr,
DMADeviceState *s = opaque;
uint32_t saddr;
- if (s->is_ledma && (addr > DMA_MAX_REG_OFFSET)) {
- /* aliased to espdma, but we can't get there from here */
- trace_sparc32_dma_mem_writel(addr, 0, val);
- return;
- }
saddr = (addr & DMA_MASK) >> 2;
trace_sparc32_dma_mem_writel(addr, s->dmaregs[saddr], val);
switch (saddr) {
@@ -296,7 +285,6 @@ static void sparc32_espdma_device_init(Object *obj)
memory_region_init_io(&s->iomem, OBJECT(s), &dma_mem_ops, s,
"espdma-mmio", DMA_SIZE);
- s->is_ledma = 0;
}
static void sparc32_espdma_device_realize(DeviceState *dev, Error **errp)
@@ -337,8 +325,7 @@ static void sparc32_ledma_device_init(Object *obj)
DMADeviceState *s = SPARC32_DMA_DEVICE(obj);
memory_region_init_io(&s->iomem, OBJECT(s), &dma_mem_ops, s,
- "ledma-mmio", DMA_ETH_SIZE);
- s->is_ledma = 1;
+ "ledma-mmio", DMA_SIZE);
}
static void sparc32_ledma_device_realize(DeviceState *dev, Error **errp)
@@ -411,6 +398,11 @@ static void sparc32_dma_realize(DeviceState *dev, Error **errp)
sbd = SYS_BUS_DEVICE(ledma);
memory_region_add_subregion(&s->dmamem, 0x10,
sysbus_mmio_get_region(sbd, 0));
+
+ /* Add ledma alias to handle SunOS 5.7 - Solaris 9 invalid access bug */
+ memory_region_init_alias(&s->ledma_alias, OBJECT(dev), "ledma-alias",
+ sysbus_mmio_get_region(sbd, 0), 0x4, 0x4);
+ memory_region_add_subregion(&s->dmamem, 0x20, &s->ledma_alias);
}
static void sparc32_dma_init(Object *obj)