[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v4] docs/misra: document the expected sizes of integer types
Xen makes assumptions about the size of integer types on the various architectures. Document these assumptions. Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx> --- Changes in v4: - list the architectures explicitly - add ARMv7-A --- docs/misra/C-language-toolchain.rst | 73 +++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) diff --git a/docs/misra/C-language-toolchain.rst b/docs/misra/C-language-toolchain.rst index b7c2000992..5ddfe7bdbe 100644 --- a/docs/misra/C-language-toolchain.rst +++ b/docs/misra/C-language-toolchain.rst @@ -480,4 +480,77 @@ The table columns are as follows: - See Section "4.13 Preprocessing Directives" of GCC_MANUAL and Section "11.1 Implementation-defined behavior" of CPP_MANUAL. +Sizes of Integer types +______________________ + +Xen expects System V ABI on x86_64: + https://gitlab.com/x86-psABIs/x86-64-ABI + +Xen expects AAPCS32 on ARMv8-A AArch32 and ARMv7-A: + https://github.com/ARM-software/abi-aa/blob/main/aapcs32/aapcs32.rst + +Xen expects AAPCS64 LP64 on ARMv8-A AArch64: + https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst + +A summary table of data types, sizes and alignment is below: + +.. list-table:: + :widths: 10 10 10 45 + :header-rows: 1 + + * - Type + - Size + - Alignment + - Architectures + + * - char + - 8 bits + - 8 bits + - x86_32, ARMv8-A AArch32, ARMv8-R AArch32, ARMv7-A, x86_64, + ARMv8-A AArch64, RV64, PPC64 + + * - short + - 16 bits + - 16 bits + - x86_32, ARMv8-A AArch32, ARMv8-R AArch32, ARMv7-A, x86_64, + ARMv8-A AArch64, RV64, PPC64 + + * - int + - 32 bits + - 32 bits + - x86_32, ARMv8-A AArch32, ARMv8-R AArch32, ARMv7-A, x86_64, + ARMv8-A AArch64, RV64, PPC64 + + * - long + - 32 bits + - 32 bits + - x86_32, ARMv8-A AArch32, ARMv8-R AArch32, ARMv7-A + + * - long + - 64 bits + - 64 bits + - x86_64, ARMv8-A AArch64, RV64, PPC64 + + * - long long + - 64-bit + - 32-bit + - x86_32 + + * - long long + - 64-bit + - 64-bit + - x86_64, ARMv8-A AArch64, RV64, PPC64, ARMv8-A AArch32, ARMv8-R + AArch32, ARMv7-A + + * - pointer + - 32-bit + - 32-bit + - x86_32, ARMv8-A AArch32, ARMv8-R AArch32, ARMv7-A + + * - pointer + - 64-bit + - 64-bit + - x86_64, ARMv8-A AArch64, RV64, PPC64 + + END OF DOCUMENT. -- 2.25.1
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