[Xen-devel] [PATCH v2 11/29] ArmPlatformPkg/PrePi: add a relocatable version of PrePi

[Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>]

This patch introduces a relocatable PrePi, which can execute
from arbitrary offsets in RAM. This is intendend to be run
from a boot loader which passes a description of the actual
platform in a device tree, for instance.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
 ArmPlatformPkg/PrePi/AArch64/ModuleEntryPoint.S |  27 +++++++++++++++++++++++
 ArmPlatformPkg/PrePi/MainUniCoreRelocatable.c   |  38 
++++++++++++++++++++++++++++++++
 ArmPlatformPkg/PrePi/PeiUniCoreRelocatable.inf  | 111 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 ArmPlatformPkg/PrePi/Scripts/PrePi-PIE.lds      |  28 ++++++++++++++++++++++++
 4 files changed, 204 insertions(+)

diff --git a/ArmPlatformPkg/PrePi/AArch64/ModuleEntryPoint.S 
b/ArmPlatformPkg/PrePi/AArch64/ModuleEntryPoint.S
index 3fa6bf1f0322..54ac01c4b9c3 100644
--- a/ArmPlatformPkg/PrePi/AArch64/ModuleEntryPoint.S
+++ b/ArmPlatformPkg/PrePi/AArch64/ModuleEntryPoint.S
@@ -28,6 +28,33 @@ GCC_ASM_EXPORT(_ModuleEntryPoint)
 StartupAddr:        .8byte ASM_PFX(CEntryPoint)
 
 ASM_PFX(_ModuleEntryPoint):
+
+#if defined (SELF_RELOCATE)
+  //
+  // If we are built as a ET_DYN PIE executable, we need to process all
+  // relative relocations regardless of whether or not we are executing from
+  // the same offset we were linked at. This is only possible if we are
+  // running from RAM.
+  //
+  adr   x8, __reloc_base
+  adr   x9, __reloc_start
+  adr   x10, __reloc_end
+
+.Lreloc_loop:
+  cmp   x9, x10
+  bhs   .Lreloc_done
+
+  ldp   x11, x12, [x9], #24
+  cmp   x12, #0x403    // R_AARCH64_RELATIVE
+  bne   .Lreloc_loop
+
+  ldr   x12, [x9, #-8]
+  add   x12, x12, x8
+  str   x12, [x11, x8]
+  b     .Lreloc_loop
+.Lreloc_done:
+#endif
+
   // Do early platform specific actions
   bl    ASM_PFX(ArmPlatformPeiBootAction)
 
diff --git a/ArmPlatformPkg/PrePi/MainUniCoreRelocatable.c 
b/ArmPlatformPkg/PrePi/MainUniCoreRelocatable.c
new file mode 100644
index 000000000000..594579971a2d
--- /dev/null
+++ b/ArmPlatformPkg/PrePi/MainUniCoreRelocatable.c
@@ -0,0 +1,38 @@
+/** @file
+*
+*  Copyright (c) 2011, ARM Limited. All rights reserved.
+*
+*  This program and the accompanying materials
+*  are licensed and made available under the terms and conditions of the BSD 
License
+*  which accompanies this distribution.  The full text of the license may be 
found at
+*  http://opensource.org/licenses/bsd-license.php
+*
+*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR 
IMPLIED.
+*
+**/
+
+#include "PrePi.h"
+
+VOID
+PrimaryMain (
+  IN  UINTN                     UefiMemoryBase,
+  IN  UINTN                     StacksBase,
+  IN  UINTN                     GlobalVariableBase,
+  IN  UINT64                    StartTimeStamp
+  )
+{
+  PrePiMain (UefiMemoryBase, StacksBase, GlobalVariableBase, StartTimeStamp, 
FALSE);
+
+  // We must never return
+  ASSERT(FALSE);
+}
+
+VOID
+SecondaryMain (
+  IN  UINTN                     MpId
+  )
+{
+  // We must never get into this function on UniCore system
+  ASSERT(FALSE);
+}
diff --git a/ArmPlatformPkg/PrePi/PeiUniCoreRelocatable.inf 
b/ArmPlatformPkg/PrePi/PeiUniCoreRelocatable.inf
new file mode 100755
index 000000000000..155aa3288341
--- /dev/null
+++ b/ArmPlatformPkg/PrePi/PeiUniCoreRelocatable.inf
@@ -0,0 +1,111 @@
+#/** @file
+#
+#  Copyright (c) 2011-2014, ARM Ltd. All rights reserved.<BR>
+#
+#  This program and the accompanying materials
+#  are licensed and made available under the terms and conditions of the BSD 
License
+#  which accompanies this distribution.  The full text of the license may be 
found at
+#  http://opensource.org/licenses/bsd-license.php
+#
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR 
IMPLIED.
+#
+#**/
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = ArmPlatformPrePiUniCoreRelocatable
+  FILE_GUID                      = f7d9fd14-9335-4389-80c5-334d6abfcced
+  MODULE_TYPE                    = SEC
+  VALID_ARCHITECTURES            = AARCH64
+  VERSION_STRING                 = 1.0
+
+[Sources]
+  PrePi.c
+  MainUniCoreRelocatable.c
+
+[Sources.AArch64]
+  AArch64/ArchPrePi.c
+  AArch64/ModuleEntryPoint.S
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+  ArmPkg/ArmPkg.dec
+  ArmPlatformPkg/ArmPlatformPkg.dec
+  ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualizationPkg.dec
+  IntelFrameworkModulePkg/IntelFrameworkModulePkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  DebugAgentLib
+  ArmLib
+  IoLib
+  TimerLib
+  SerialPortLib
+  ExtractGuidedSectionLib
+  LzmaDecompressLib
+  PeCoffGetEntryPointLib
+  DebugAgentLib
+  PrePiLib
+  ArmPlatformLib
+  ArmPlatformStackLib
+  MemoryAllocationLib
+  HobLib
+  PrePiHobListPointerLib
+  PlatformPeiLib
+  MemoryInitPeiLib
+
+[Ppis]
+  gArmMpCoreInfoPpiGuid
+
+[Guids]
+  gArmGlobalVariableGuid
+  gArmMpCoreInfoGuid
+
+[FeaturePcd]
+  gEmbeddedTokenSpaceGuid.PcdPrePiProduceMemoryTypeInformationHob
+  gArmPlatformTokenSpaceGuid.PcdSendSgiToBringUpSecondaryCores
+
+[FixedPcd]
+  gEfiMdeModulePkgTokenSpaceGuid.PcdFirmwareVersionString
+
+  gArmTokenSpaceGuid.PcdVFPEnabled
+
+  gArmTokenSpaceGuid.PcdFdSize
+  gArmTokenSpaceGuid.PcdFvSize
+
+  gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
+  gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize
+
+  gArmPlatformTokenSpaceGuid.PcdPeiGlobalVariableSize
+
+  gArmPlatformTokenSpaceGuid.PcdSystemMemoryUefiRegionSize
+
+  gArmPlatformTokenSpaceGuid.PcdCoreCount
+
+  gEmbeddedTokenSpaceGuid.PcdPrePiCpuMemorySize
+  gEmbeddedTokenSpaceGuid.PcdPrePiCpuIoSize
+
+  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiACPIReclaimMemory
+  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiACPIMemoryNVS
+  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiReservedMemoryType
+  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiRuntimeServicesData
+  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiRuntimeServicesCode
+  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiBootServicesCode
+  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiBootServicesData
+  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderCode
+  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderData
+
+[Pcd]
+  gArmTokenSpaceGuid.PcdSystemMemoryBase
+  gArmTokenSpaceGuid.PcdSystemMemorySize
+  gArmVirtualizationTokenSpaceGuid.PcdDeviceTreeInitialBaseAddress
+  gArmTokenSpaceGuid.PcdFdBaseAddress
+  gArmTokenSpaceGuid.PcdFvBaseAddress
+
+[BuildOptions]
+  GCC:*_*_AARCH64_PP_FLAGS = -DSELF_RELOCATE
+  GCC:*_*_AARCH64_DLINK_FLAGS = -pie -T $(MODULE_DIR)/Scripts/PrePi-PIE.lds
diff --git a/ArmPlatformPkg/PrePi/Scripts/PrePi-PIE.lds 
b/ArmPlatformPkg/PrePi/Scripts/PrePi-PIE.lds
new file mode 100644
index 000000000000..880f9b114ddd
--- /dev/null
+++ b/ArmPlatformPkg/PrePi/Scripts/PrePi-PIE.lds
@@ -0,0 +1,28 @@
+SECTIONS
+{
+  .text 0x0 : {
+    PROVIDE(__reloc_base = .);
+
+    *(.text .text*)
+    *(.got .got*)
+    *(.rodata .rodata*)
+    *(.data .data*)
+
+    . = ALIGN(0x20);
+    PROVIDE(__reloc_start = .);
+    *(.rela .rela*)
+    PROVIDE(__reloc_end = .);
+  }
+  .bss ALIGN(0x20) : { *(.bss .bss*) }
+
+  /DISCARD/ : {
+    *(.note.GNU-stack)
+    *(.gnu_debuglink)
+    *(.interp)
+    *(.dynamic)
+    *(.dynsym)
+    *(.dynstr)
+    *(.hash)
+    *(.comment)
+  }
+}
-- 
1.8.3.2


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