diff options
| -rw-r--r-- | arch/mips/Kconfig.debug | 13 | ||||
| -rw-r--r-- | arch/mips/kernel/elf.c | 18 |
2 files changed, 31 insertions, 0 deletions
diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug index 3a2b775e8458..88a9f433f6fc 100644 --- a/arch/mips/Kconfig.debug +++ b/arch/mips/Kconfig.debug @@ -122,4 +122,17 @@ config SPINLOCK_TEST help Add several files to the debugfs to test spinlock speed. +config FP32XX_HYBRID_FPRS + bool "Run FP32 & FPXX code with hybrid FPRs" + depends on MIPS_O32_FP64_SUPPORT + help + The hybrid FPR scheme is normally used only when a program needs to + execute a mix of FP32 & FP64A code, since the trapping & emulation + that it entails is expensive. When enabled, this option will lead + to the kernel running programs which use the FP32 & FPXX FP ABIs + using the hybrid FPR scheme, which can be useful for debugging + purposes. + + If unsure, say N. + endmenu diff --git a/arch/mips/kernel/elf.c b/arch/mips/kernel/elf.c index 0933e0726f64..c92b15df6893 100644 --- a/arch/mips/kernel/elf.c +++ b/arch/mips/kernel/elf.c @@ -134,6 +134,24 @@ int arch_check_elf(void *_ehdr, bool has_interpreter, void mips_set_personality_fp(struct arch_elf_state *state) { + if (config_enabled(CONFIG_FP32XX_HYBRID_FPRS)) { + /* + * Use hybrid FPRs for all code which can correctly execute + * with that mode. + */ + switch (state->overall_abi) { + case MIPS_ABI_FP_DOUBLE: + case MIPS_ABI_FP_SINGLE: + case MIPS_ABI_FP_SOFT: + case MIPS_ABI_FP_XX: + case MIPS_ABI_FP_ANY: + /* FR=1, FRE=1 */ + clear_thread_flag(TIF_32BIT_FPREGS); + set_thread_flag(TIF_HYBRID_FPREGS); + return; + } + } + switch (state->overall_abi) { case MIPS_ABI_FP_DOUBLE: case MIPS_ABI_FP_SINGLE: |