CONFIG_MIPS_O32_FP64_SUPPORT: Support for O32 binaries using 64-bit FP

General informations

The Linux kernel configuration item CONFIG_MIPS_O32_FP64_SUPPORT has multiple definitions:

Support for O32 binaries using 64-bit FP found in arch/mips/Kconfig

The configuration item CONFIG_MIPS_O32_FP64_SUPPORT:

• prompt: Support for O32 binaries using 64-bit FP
• type: bool
• depends on: (! CONFIG_CPU_MIPSR6 ) && ( CONFIG_32BIT || CONFIG_MIPS32_O32 )
• defined in arch/mips/Kconfig
• found in Linux kernels: 4.3–4.20, 5.0–5.19, 6.0–6.12

Help text

When this is enabled, the kernel will support use of 64-bit floating point registers with binaries using the O32 ABI along with the EF_MIPS_FP64 ELF header flag (typically built with -mfp64). On 32-bit MIPS systems this support is at the cost of increasing the size and complexity of the compiled FPU emulator. Thus if you are running a MIPS32 system and know that none of your userland binaries will require 64-bit floating point, you may wish to reduce the size of your kernel & potentially improve FP emulation performance by saying N here.

Although binutils currently supports use of this flag the details concerning its effect upon the O32 ABI in userland are still being worked on. In order to avoid userland becoming dependent upon current behaviour before the details have been finalised, this option should be considered experimental and only enabled by those working upon said details.

If unsure, say N.

Support for O32 binaries using 64-bit FP (EXPERIMENTAL) found in arch/mips/Kconfig

The configuration item CONFIG_MIPS_O32_FP64_SUPPORT:

• prompt: Support for O32 binaries using 64-bit FP (EXPERIMENTAL)
• type: bool
• depends on: CONFIG_32BIT || CONFIG_MIPS32_O32
• defined in arch/mips/Kconfig
• found in Linux kernels: 3.14–3.19, 4.0–4.2

Help text

When this is enabled, the kernel will support use of 64-bit floating point registers with binaries using the O32 ABI along with the EF_MIPS_FP64 ELF header flag (typically built with -mfp64). On 32-bit MIPS systems this support is at the cost of increasing the size and complexity of the compiled FPU emulator. Thus if you are running a MIPS32 system and know that none of your userland binaries will require 64-bit floating point, you may wish to reduce the size of your kernel & potentially improve FP emulation performance by saying N here.

Although binutils currently supports use of this flag the details concerning its effect upon the O32 ABI in userland are still being worked on. In order to avoid userland becoming dependant upon current behaviour before the details have been finalised, this option should be considered experimental and only enabled by those working upon said details.

If unsure, say N.

Hardware

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