efi_loader: Introduce ms abi vararg helpers

Varargs differ between sysv and ms abi. On x86_64 we have to follow the ms
abi though, so we also need to make sure we use x86_64 varargs helpers.

This patch introduces generic efi vararg helpers that adhere to the
respective EFI ABI. That way we can deal with them properly from efi
loader code and properly interpret variable arguments.

This fixes the InstallMultipleProtocolInterfaces tests in the efi selftests
on x86_64 for me.

Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/include/efi.h b/include/efi.h
index 0fe15e65c06c6737d2c6b5ce1da765b25c5afc80..41530a7537d34550c4b7fc542b72934afb9ac352 100644 (file)
--- a/include/efi.h
+++ b/include/efi.h
@@ -29,8 +29,16 @@
  */
 #ifdef __x86_64__
 #define EFIAPI __attribute__((ms_abi))
+#define efi_va_list __builtin_ms_va_list
+#define efi_va_start __builtin_ms_va_start
+#define efi_va_arg __builtin_va_arg
+#define efi_va_end __builtin_ms_va_end
 #else
 #define EFIAPI asmlinkage
+#define efi_va_list va_list
+#define efi_va_start va_start
+#define efi_va_arg va_arg
+#define efi_va_end va_end
 #endif /* __x86_64__ */
 
 struct efi_device_path;

diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index eeefe0bdfe3bb1a813318a19143571748cc54bcb..46c8ecd187fe7d906eb6a442b956337020e13d1b 100644 (file)
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -2302,7 +2302,7 @@ static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces(
 {
        EFI_ENTRY("%p", handle);
 
-       va_list argptr;
+       efi_va_list argptr;
        const efi_guid_t *protocol;
        void *protocol_interface;
        efi_status_t r = EFI_SUCCESS;
@@ -2311,12 +2311,12 @@ static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces(
        if (!handle)
                return EFI_EXIT(EFI_INVALID_PARAMETER);
 
-       va_start(argptr, handle);
+       efi_va_start(argptr, handle);
        for (;;) {
-               protocol = va_arg(argptr, efi_guid_t*);
+               protocol = efi_va_arg(argptr, efi_guid_t*);
                if (!protocol)
                        break;
-               protocol_interface = va_arg(argptr, void*);
+               protocol_interface = efi_va_arg(argptr, void*);
                r = EFI_CALL(efi_install_protocol_interface(
                                                handle, protocol,
                                                EFI_NATIVE_INTERFACE,
@@ -2325,19 +2325,19 @@ static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces(
                        break;
                i++;
        }
-       va_end(argptr);
+       efi_va_end(argptr);
        if (r == EFI_SUCCESS)
                return EFI_EXIT(r);
 
        /* If an error occurred undo all changes. */
-       va_start(argptr, handle);
+       efi_va_start(argptr, handle);
        for (; i; --i) {
-               protocol = va_arg(argptr, efi_guid_t*);
-               protocol_interface = va_arg(argptr, void*);
+               protocol = efi_va_arg(argptr, efi_guid_t*);
+               protocol_interface = efi_va_arg(argptr, void*);
                EFI_CALL(efi_uninstall_protocol_interface(handle, protocol,
                                                          protocol_interface));
        }
-       va_end(argptr);
+       efi_va_end(argptr);
 
        return EFI_EXIT(r);
 }
@@ -2361,7 +2361,7 @@ static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces(
 {
        EFI_ENTRY("%p", handle);
 
-       va_list argptr;
+       efi_va_list argptr;
        const efi_guid_t *protocol;
        void *protocol_interface;
        efi_status_t r = EFI_SUCCESS;
@@ -2370,12 +2370,12 @@ static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces(
        if (!handle)
                return EFI_EXIT(EFI_INVALID_PARAMETER);
 
-       va_start(argptr, handle);
+       efi_va_start(argptr, handle);
        for (;;) {
-               protocol = va_arg(argptr, efi_guid_t*);
+               protocol = efi_va_arg(argptr, efi_guid_t*);
                if (!protocol)
                        break;
-               protocol_interface = va_arg(argptr, void*);
+               protocol_interface = efi_va_arg(argptr, void*);
                r = EFI_CALL(efi_uninstall_protocol_interface(
                                                handle, protocol,
                                                protocol_interface));
@@ -2383,20 +2383,20 @@ static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces(
                        break;
                i++;
        }
-       va_end(argptr);
+       efi_va_end(argptr);
        if (r == EFI_SUCCESS)
                return EFI_EXIT(r);
 
        /* If an error occurred undo all changes. */
-       va_start(argptr, handle);
+       efi_va_start(argptr, handle);
        for (; i; --i) {
-               protocol = va_arg(argptr, efi_guid_t*);
-               protocol_interface = va_arg(argptr, void*);
+               protocol = efi_va_arg(argptr, efi_guid_t*);
+               protocol_interface = efi_va_arg(argptr, void*);
                EFI_CALL(efi_install_protocol_interface(&handle, protocol,
                                                        EFI_NATIVE_INTERFACE,
                                                        protocol_interface));
        }
-       va_end(argptr);
+       efi_va_end(argptr);
 
        return EFI_EXIT(r);
 }