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.
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel ard.biesheuvel@linaro.org --- ArmPlatformPkg/PrePi/AArch64/ModuleEntryPoint.S | 27 ++++++ ArmPlatformPkg/PrePi/MainUniCoreRelocatable.c | 38 +++++++++ ArmPlatformPkg/PrePi/PeiUniCoreRelocatable.inf | 108 ++++++++++++++++++++++++ ArmPlatformPkg/PrePi/Scripts/PrePi-PIE.lds | 28 ++++++ 4 files changed, 201 insertions(+) create mode 100644 ArmPlatformPkg/PrePi/MainUniCoreRelocatable.c create mode 100755 ArmPlatformPkg/PrePi/PeiUniCoreRelocatable.inf create mode 100644 ArmPlatformPkg/PrePi/Scripts/PrePi-PIE.lds
diff --git a/ArmPlatformPkg/PrePi/AArch64/ModuleEntryPoint.S b/ArmPlatformPkg/PrePi/AArch64/ModuleEntryPoint.S index 9e1477107d30..816d1298fc82 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..33b2052f7ab4 --- /dev/null +++ b/ArmPlatformPkg/PrePi/PeiUniCoreRelocatable.inf @@ -0,0 +1,108 @@ +#/** @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 + 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.PcdFdBaseAddress + gArmTokenSpaceGuid.PcdFdSize + + gArmTokenSpaceGuid.PcdFvBaseAddress + 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 + gArmTokenSpaceGuid.PcdSystemMemoryBase + gArmTokenSpaceGuid.PcdSystemMemorySize + +[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) + } +}