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memory: dispatch unassigned accesses based on .valid.accepts 

This provides the basics for detecting accesses to unassigned memory
as soon as they happen, and also for a simple implementation of
address_space_access_valid.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-05-24 14:48:38 +02:00
parent bf8d516639
commit b018ddf633
2 changed files with 38 additions and 26 deletions
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36
exec.c
View File

@ -1383,32 +1383,14 @@ ram_addr_t qemu_ram_addr_from_host_nofail(void *ptr)
return ram_addr;
}
static uint64_t unassigned_mem_read(void *opaque, hwaddr addr,
unsigned size)
static bool unassigned_mem_accepts(void *opaque, hwaddr addr,
unsigned size, bool is_write)
{
#ifdef DEBUG_UNASSIGNED
printf("Unassigned mem read " TARGET_FMT_plx "\n", addr);
#endif
#if defined(TARGET_ALPHA) || defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
cpu_unassigned_access(cpu_single_env, addr, 0, 0, 0, size);
#endif
return 0;
return false;
}
static void unassigned_mem_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
#ifdef DEBUG_UNASSIGNED
printf("Unassigned mem write " TARGET_FMT_plx " = 0x%"PRIx64"\n", addr, val);
#endif
#if defined(TARGET_ALPHA) || defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
cpu_unassigned_access(cpu_single_env, addr, 1, 0, 0, size);
#endif
}
static const MemoryRegionOps unassigned_mem_ops = {
.read = unassigned_mem_read,
.write = unassigned_mem_write,
const MemoryRegionOps unassigned_mem_ops = {
.valid.accepts = unassigned_mem_accepts,
.endianness = DEVICE_NATIVE_ENDIAN,
};
@ -1442,9 +1424,15 @@ static void notdirty_mem_write(void *opaque, hwaddr ram_addr,
tlb_set_dirty(cpu_single_env, cpu_single_env->mem_io_vaddr);
}
static bool notdirty_mem_accepts(void *opaque, hwaddr addr,
unsigned size, bool is_write)
{
return is_write;
}
static const MemoryRegionOps notdirty_mem_ops = {
.read = unassigned_mem_read,
.write = notdirty_mem_write,
.valid.accepts = notdirty_mem_accepts,
.endianness = DEVICE_NATIVE_ENDIAN,
};

28
memory.c
View File

@ -814,6 +814,29 @@ void memory_region_init(MemoryRegion *mr,
mr->flush_coalesced_mmio = false;
}
static uint64_t unassigned_mem_read(void *opaque, hwaddr addr,
unsigned size)
{
#ifdef DEBUG_UNASSIGNED
printf("Unassigned mem read " TARGET_FMT_plx "\n", addr);
#endif
#if defined(TARGET_ALPHA) || defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
cpu_unassigned_access(cpu_single_env, addr, 0, 0, 0, size);
#endif
return 0;
}
static void unassigned_mem_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
#ifdef DEBUG_UNASSIGNED
printf("Unassigned mem write " TARGET_FMT_plx " = 0x%"PRIx64"\n", addr, val);
#endif
#if defined(TARGET_ALPHA) || defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
cpu_unassigned_access(cpu_single_env, addr, 1, 0, 0, size);
#endif
}
static bool memory_region_access_valid(MemoryRegion *mr,
hwaddr addr,
unsigned size,
@ -847,7 +870,7 @@ static uint64_t memory_region_dispatch_read1(MemoryRegion *mr,
uint64_t data = 0;
if (!memory_region_access_valid(mr, addr, size, false)) {
return -1U; /* FIXME: better signalling */
return unassigned_mem_read(mr, addr, size);
}
if (!mr->ops->read) {
@ -898,7 +921,8 @@ static void memory_region_dispatch_write(MemoryRegion *mr,
unsigned size)
{
if (!memory_region_access_valid(mr, addr, size, true)) {
return; /* FIXME: better signalling */
unassigned_mem_write(mr, addr, data, size);
return;
}
adjust_endianness(mr, &data, size);