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>

diff --git a/hw/dma/sparc32_dma.c b/hw/dma/sparc32_dma.c
index 582b7cc976b1f262723552d85346f58f46835750..f64787e904cb6eaea664a388c84e3b9318ba39f2 100644 (file)
--- 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)

diff --git a/include/hw/sparc/sparc32_dma.h b/include/hw/sparc/sparc32_dma.h
index 5deeca6c127531450dfe9ea7377f849716991778..ab42c5421bc3ebed76c866522d552158695208f2 100644 (file)
--- a/include/hw/sparc/sparc32_dma.h
+++ b/include/hw/sparc/sparc32_dma.h
@@ -21,7 +21,6 @@ struct DMADeviceState {
     qemu_irq irq;
     void *iommu;
     qemu_irq gpio[2];
-    uint32_t is_ledma;
 };
 
 #define TYPE_SPARC32_ESPDMA_DEVICE "sparc32-espdma"
@@ -52,6 +51,7 @@ typedef struct SPARC32DMAState {
     SysBusDevice parent_obj;
 
     MemoryRegion dmamem;
+    MemoryRegion ledma_alias;
     ESPDMADeviceState *espdma;
     LEDMADeviceState *ledma;
 } SPARC32DMAState;