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MdeModulePkg/EbcDxe AARCH64: simplify interpreter entry point thunks

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The prototypes of EbcInterpret() and ExecuteEbcImageEntryPoint() are
private to the AARCH64 implementation of EbcDxe, so we can shuffle
the arguments around a bit and make the assembler thunking glue a lot
simpler.

For ExecuteEbcImageEntryPoint(), this involves passing the EntryPoint
argument as the third parameter, rather than the first, which allows
us to do a tail call. For EbcInterpret(), instead of copying each
argument beyond #8 from one native stack frame to the next (before
another copy is made into the VM stack), pass a pointer to the
argument stack.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Feng Tian <feng.tian@intel.com>
This commit is contained in:
Ard Biesheuvel
2016-08-17 16:36:42 +02:00
parent 3226e315d2
commit 4a2aaff2fc
2 changed files with 35 additions and 82 deletions
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60
MdeModulePkg/Universal/EbcDxe/AArch64/EbcSupport.c
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@@ -89,7 +89,6 @@ PushU64 (
This is a thunk function.
@param EntryPoint The entrypoint of EBC code.
@param Arg1 The 1st argument.
@param Arg2 The 2nd argument.
@param Arg3 The 3rd argument.
@@ -98,14 +97,8 @@ PushU64 (
@param Arg6 The 6th argument.
@param Arg7 The 7th argument.
@param Arg8 The 8th argument.
@param Arg9 The 9th argument.
@param Arg10 The 10th argument.
@param Arg11 The 11th argument.
@param Arg12 The 12th argument.
@param Arg13 The 13th argument.
@param Arg14 The 14th argument.
@param Arg15 The 15th argument.
@param Arg16 The 16th argument.
@param EntryPoint The entrypoint of EBC code.
@param Args9_16[] Array containing arguments #9 to #16.
@return The value returned by the EBC application we're going to run.
@@ -113,23 +106,16 @@ PushU64 (
UINT64
EFIAPI
EbcInterpret (
IN UINTN EntryPoint,
IN UINTN Arg1,
IN UINTN Arg2,
IN UINTN Arg3,
IN UINTN Arg4,
IN UINTN Arg5,
IN UINTN Arg6,
IN UINTN Arg7,
IN UINTN Arg8,
IN UINTN Arg9,
IN UINTN Arg10,
IN UINTN Arg11,
IN UINTN Arg12,
IN UINTN Arg13,
IN UINTN Arg14,
IN UINTN Arg15,
IN UINTN Arg16
IN UINTN Arg1,
IN UINTN Arg2,
IN UINTN Arg3,
IN UINTN Arg4,
IN UINTN Arg5,
IN UINTN Arg6,
IN UINTN Arg7,
IN UINTN Arg8,
IN UINTN EntryPoint,
IN CONST UINTN Args9_16[]
)
{
//
@@ -193,14 +179,14 @@ EbcInterpret (
// For the worst case, assume there are 4 arguments passed in registers, store
// them to VM's stack.
//
PushU64 (&VmContext, (UINT64) Arg16);
PushU64 (&VmContext, (UINT64) Arg15);
PushU64 (&VmContext, (UINT64) Arg14);
PushU64 (&VmContext, (UINT64) Arg13);
PushU64 (&VmContext, (UINT64) Arg12);
PushU64 (&VmContext, (UINT64) Arg11);
PushU64 (&VmContext, (UINT64) Arg10);
PushU64 (&VmContext, (UINT64) Arg9);
PushU64 (&VmContext, (UINT64) Args9_16[7]);
PushU64 (&VmContext, (UINT64) Args9_16[6]);
PushU64 (&VmContext, (UINT64) Args9_16[5]);
PushU64 (&VmContext, (UINT64) Args9_16[4]);
PushU64 (&VmContext, (UINT64) Args9_16[3]);
PushU64 (&VmContext, (UINT64) Args9_16[2]);
PushU64 (&VmContext, (UINT64) Args9_16[1]);
PushU64 (&VmContext, (UINT64) Args9_16[0]);
PushU64 (&VmContext, (UINT64) Arg8);
PushU64 (&VmContext, (UINT64) Arg7);
PushU64 (&VmContext, (UINT64) Arg6);
@@ -252,10 +238,10 @@ EbcInterpret (
/**
Begin executing an EBC image.
@param EntryPoint The entrypoint of EBC code.
@param ImageHandle image handle for the EBC application we're executing
@param SystemTable standard system table passed into an driver's entry
point
@param EntryPoint The entrypoint of EBC code.
@return The value returned by the EBC application we're going to run.
@@ -263,9 +249,9 @@ EbcInterpret (
UINT64
EFIAPI
ExecuteEbcImageEntryPoint (
IN UINTN EntryPoint,
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
IN EFI_SYSTEM_TABLE *SystemTable,
IN UINTN EntryPoint
)
{
//