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SharedMemory: Updated MapSharedMemory to use an enum for permissions.

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- Also added some safety checks to MapSharedMemory.
This commit is contained in:
bunnei 2014-07-05 10:22:03 -04:00
parent 882dc07929
commit 7ff92c36ed
3 changed files with 36 additions and 16 deletions
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21
src/core/hle/kernel/shared_memory.cpp
View file

@ -27,10 +27,10 @@ public:
return 0;
}
u32 base_address; ///< Address of shared memory block in RAM
u32 permissions; ///< Permissions of shared memory block (specified by SVC field)
u32 other_permissions; ///< Other permissions of shared memory block (specified by SVC field)
std::string name; ///< Name of shared memory object (optional)
u32 base_address; ///< Address of shared memory block in RAM
MemoryPermission permissions; ///< Permissions of shared memory block (SVC field)
MemoryPermission other_permissions; ///< Other permissions of shared memory block (SVC field)
std::string name; ///< Name of shared memory object (optional)
};
////////////////////////////////////////////////////////////////////////////////////////////////////
@ -67,11 +67,21 @@ Handle CreateSharedMemory(const std::string& name) {
* @param other_permissions Memory block map other permissions (specified by SVC field)
* @return Result of operation, 0 on success, otherwise error code
*/
Result MapSharedMemory(u32 handle, u32 address, u32 permissions, u32 other_permissions) {
Result MapSharedMemory(u32 handle, u32 address, MemoryPermission permissions,
MemoryPermission other_permissions) {
if (address < Memory::SHARED_MEMORY_VADDR || address >= Memory::SHARED_MEMORY_VADDR_END) {
ERROR_LOG(KERNEL, "cannot map handle=0x%08X, address=0x%08X outside of shared mem bounds!",
handle);
return -1;
}
SharedMemory* shared_memory = Kernel::g_object_pool.GetFast<SharedMemory>(handle);
_assert_msg_(KERNEL, (shared_memory != nullptr), "handle 0x%08X is not valid!", handle);
shared_memory->base_address = address;
shared_memory->permissions = permissions;
shared_memory->other_permissions = other_permissions;
return 0;
}
@ -84,6 +94,7 @@ Result MapSharedMemory(u32 handle, u32 address, u32 permissions, u32 other_permi
u8* GetSharedMemoryPointer(Handle handle, u32 offset) {
SharedMemory* shared_memory = Kernel::g_object_pool.GetFast<SharedMemory>(handle);
_assert_msg_(KERNEL, (shared_memory != nullptr), "handle 0x%08X is not valid!", handle);
if (0 != shared_memory->base_address)
return Memory::GetPointer(shared_memory->base_address + offset);

12
src/core/hle/kernel/shared_memory.h
View file

@ -10,6 +10,15 @@
namespace Kernel {
/// Permissions for mapped shared memory blocks
enum class MemoryPermission : u32 {
None = 0,
Read = (1u << 0),
Write = (1u << 1),
ReadWrite = (Read | Write),
DontCare = (1u << 28)
};
/**
* Creates a shared memory object
* @param name Optional name of shared memory object
@ -25,7 +34,8 @@ Handle CreateSharedMemory(const std::string& name="Unknown");
* @param other_permissions Memory block map other permissions (specified by SVC field)
* @return Result of operation, 0 on success, otherwise error code
*/
Result MapSharedMemory(u32 handle, u32 address, u32 permissions, u32 other_permissions);
Result MapSharedMemory(u32 handle, u32 address, MemoryPermission permissions,
MemoryPermission other_permissions);
/**
* Gets a pointer to the shared memory block