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HLE: Revamp error handling throrough the HLE code

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All service calls in the CTR OS return result codes indicating the
success or failure of the call. Previous to this commit, Citra's HLE
emulation of services and the kernel universally either ignored errors
or returned dummy -1 error codes.

This commit makes an initial effort to provide an infrastructure for
error reporting and propagation which can be use going forward to make
HLE calls accurately return errors as the original system. A few parts
of the code have been updated to use the new system where applicable.

One part of this effort is the definition of the `ResultCode` type,
which provides facilities for constructing and parsing error codes in
the structured format used by the CTR.

The `ResultVal` type builds on `ResultCode` by providing a container for
values returned by function that can report errors. It enforces that
correct error checking will be done on function returns by preventing
the use of the return value if the function returned an error code.

Currently this change is mostly internal since errors are still
suppressed on the ARM<->HLE border, as a temporary compatibility hack.
As functionality is implemented and tested this hack can be eventually
removed.
This commit is contained in:
Yuri Kunde Schlesner
2014-10-23 01:20:01 -02:00
parent 924bbde89b
commit c2588403c0
23 changed files with 689 additions and 310 deletions
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66
src/core/hle/service/fs_user.cpp
View File

@ -4,26 +4,24 @@
#include "common/common.h"
#include "fs_user.h"
#include "common/string_util.h"
#include "core/settings.h"
#include "core/hle/kernel/archive.h"
#include "core/hle/kernel/archive.h"
#include "core/hle/result.h"
#include "core/hle/service/fs_user.h"
#include "core/settings.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
// Namespace FS_User
namespace FS_User {
// We currently return 0 for success and -1 for failure in cmd_buff[1]. -1 was chosen because it
// puts all the sections of the http://3dbrew.org/wiki/Error_codes to something non-zero, to make
// sure we don't mislead the application into thinking something worked.
static void Initialize(Service::Interface* self) {
u32* cmd_buff = Service::GetCommandBuffer();
// TODO(Link Mauve): check the behavior when cmd_buff[1] isn't 32, as per
// http://3dbrew.org/wiki/FS:Initialize#Request
cmd_buff[1] = 0;
cmd_buff[1] = RESULT_SUCCESS.raw;
DEBUG_LOG(KERNEL, "called");
}
@ -59,14 +57,12 @@ static void OpenFile(Service::Interface* self) {
DEBUG_LOG(KERNEL, "path=%s, mode=%d attrs=%d", file_path.DebugStr().c_str(), mode, attributes);
Handle handle = Kernel::OpenFileFromArchive(archive_handle, file_path, mode);
if (handle) {
cmd_buff[1] = 0;
cmd_buff[3] = handle;
ResultVal<Handle> handle = Kernel::OpenFileFromArchive(archive_handle, file_path, mode);
cmd_buff[1] = handle.Code().raw;
if (handle.Succeeded()) {
cmd_buff[3] = *handle;
} else {
ERROR_LOG(KERNEL, "failed to get a handle for file %s", file_path.DebugStr().c_str());
// TODO(Link Mauve): check for the actual error values, this one was just chosen arbitrarily.
cmd_buff[1] = -1;
}
DEBUG_LOG(KERNEL, "called");
@ -111,27 +107,27 @@ static void OpenFileDirectly(Service::Interface* self) {
if (archive_path.GetType() != FileSys::Empty) {
ERROR_LOG(KERNEL, "archive LowPath type other than empty is currently unsupported");
cmd_buff[1] = -1;
cmd_buff[1] = UnimplementedFunction(ErrorModule::FS).raw;
return;
}
// TODO(Link Mauve): Check if we should even get a handle for the archive, and don't leak it
Handle archive_handle = Kernel::OpenArchive(archive_id);
if (!archive_handle) {
// TODO(yuriks): Why is there all this duplicate (and seemingly useless) code up here?
ResultVal<Handle> archive_handle = Kernel::OpenArchive(archive_id);
cmd_buff[1] = archive_handle.Code().raw;
if (archive_handle.Failed()) {
ERROR_LOG(KERNEL, "failed to get a handle for archive");
// TODO(Link Mauve): Check for the actual error values, this one was just chosen arbitrarily
cmd_buff[1] = -1;
return;
}
// cmd_buff[2] isn't used according to 3dmoo's implementation.
cmd_buff[3] = *archive_handle;
Handle handle = Kernel::OpenFileFromArchive(archive_handle, file_path, mode);
if (handle) {
cmd_buff[1] = 0;
cmd_buff[3] = handle;
ResultVal<Handle> handle = Kernel::OpenFileFromArchive(*archive_handle, file_path, mode);
cmd_buff[1] = handle.Code().raw;
if (handle.Succeeded()) {
cmd_buff[3] = *handle;
} else {
ERROR_LOG(KERNEL, "failed to get a handle for file %s", file_path.DebugStr().c_str());
// TODO(Link Mauve): check for the actual error values, this one was just chosen arbitrarily.
cmd_buff[1] = -1;
}
DEBUG_LOG(KERNEL, "called");
@ -243,14 +239,12 @@ static void OpenDirectory(Service::Interface* self) {
DEBUG_LOG(KERNEL, "type=%d size=%d data=%s", dirname_type, dirname_size, dir_path.DebugStr().c_str());
Handle handle = Kernel::OpenDirectoryFromArchive(archive_handle, dir_path);
if (handle) {
cmd_buff[1] = 0;
cmd_buff[3] = handle;
ResultVal<Handle> handle = Kernel::OpenDirectoryFromArchive(archive_handle, dir_path);
cmd_buff[1] = handle.Code().raw;
if (handle.Succeeded()) {
cmd_buff[3] = *handle;
} else {
ERROR_LOG(KERNEL, "failed to get a handle for directory");
// TODO(Link Mauve): check for the actual error values, this one was just chosen arbitrarily.
cmd_buff[1] = -1;
}
DEBUG_LOG(KERNEL, "called");
@ -282,19 +276,17 @@ static void OpenArchive(Service::Interface* self) {
if (archive_path.GetType() != FileSys::Empty) {
ERROR_LOG(KERNEL, "archive LowPath type other than empty is currently unsupported");
cmd_buff[1] = -1;
cmd_buff[1] = UnimplementedFunction(ErrorModule::FS).raw;
return;
}
Handle handle = Kernel::OpenArchive(archive_id);
if (handle) {
cmd_buff[1] = 0;
ResultVal<Handle> handle = Kernel::OpenArchive(archive_id);
cmd_buff[1] = handle.Code().raw;
if (handle.Succeeded()) {
// cmd_buff[2] isn't used according to 3dmoo's implementation.
cmd_buff[3] = handle;
cmd_buff[3] = *handle;
} else {
ERROR_LOG(KERNEL, "failed to get a handle for archive");
// TODO(Link Mauve): check for the actual error values, this one was just chosen arbitrarily.
cmd_buff[1] = -1;
}
DEBUG_LOG(KERNEL, "called");