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ArmPlatformPkg/ArmJunoPkg: use a rodata symbol for ReferenceAcpiTable

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The ACPI .aslc files contain a ReferenceAcpiTable() function whose
sole purpose is to ensure that the table itself does not get optimized
away. However, when using clang, these dummy functions result in a 4 KB
section alignment requirement, which is silly since everything except
the .data section is discarded later anyway.

So instead, make ReferenceAcpiTable a CONST pointer to VOID*. This way,
we still have a .text section, which is mandatory for the PE/COFF
conversion, but no executable code with small model relocations that
impose additional alignment requirements.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Tested-by: Leif Lindholm <leif.lindholm@linaro.org>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18194 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ard Biesheuvel 2015-08-10 07:54:55 +00:00 committed by abiesheuvel
parent baeddf2b27
commit 9bdf791f7d
4 changed files with 20 additions and 44 deletions
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16
ArmPlatformPkg/ArmJunoPkg/AcpiTables/Facs.aslc
View File

@ -55,14 +55,8 @@ EFI_ACPI_5_0_FIRMWARE_ACPI_CONTROL_STRUCTURE Facs = {
EFI_ACPI_RESERVED_BYTE }, // UINT8 Reserved1[23]
};
VOID*
ReferenceAcpiTable (
VOID
)
{
//
// Reference the table being generated to prevent the optimizer from removing the
// data structure from the executable
//
return (VOID*)&Facs;
}
//
// Reference the table being generated to prevent the optimizer from removing the
// data structure from the executable
//
VOID* CONST ReferenceAcpiTable = &Facs;

16
ArmPlatformPkg/ArmJunoPkg/AcpiTables/Fadt.aslc
View File

@ -92,14 +92,8 @@ EFI_ACPI_5_1_FIXED_ACPI_DESCRIPTION_TABLE Fadt = {
NULL_GAS // EFI_ACPI_5_0_GENERIC_ADDRESS_STRUCTURE SleepStatusReg
};
VOID*
ReferenceAcpiTable (
VOID
)
{
//
// Reference the table being generated to prevent the optimizer from removing the
// data structure from the executable
//
return (VOID*)&Fadt;
}
//
// Reference the table being generated to prevent the optimizer from removing the
// data structure from the executable
//
VOID* CONST ReferenceAcpiTable = &Fadt;

16
ArmPlatformPkg/ArmJunoPkg/AcpiTables/Gtdt.aslc
View File

@ -96,14 +96,8 @@
};
#endif
VOID*
ReferenceAcpiTable (
VOID
)
{
//
// Reference the table being generated to prevent the optimizer from removing the
// data structure from the exeutable
//
return (VOID*)&Gtdt;
}
//
// Reference the table being generated to prevent the optimizer from removing the
// data structure from the executable
//
VOID* CONST ReferenceAcpiTable = &Gtdt;

16
ArmPlatformPkg/ArmJunoPkg/AcpiTables/Madt.aslc
View File

@ -123,14 +123,8 @@
};
#endif
VOID*
ReferenceAcpiTable (
VOID
)
{
//
// Reference the table being generated to prevent the optimizer from removing the
// data structure from the executable
//
return (VOID*)&Madt;
}
//
// Reference the table being generated to prevent the optimizer from removing the
// data structure from the executable
//
VOID* CONST ReferenceAcpiTable = &Madt;