diff options
Diffstat (limited to 'target/linux/generic/patches-4.9/304-mips_disable_fpu.patch')
| -rw-r--r-- | target/linux/generic/patches-4.9/304-mips_disable_fpu.patch | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.9/304-mips_disable_fpu.patch b/target/linux/generic/patches-4.9/304-mips_disable_fpu.patch new file mode 100644 index 0000000..2ab99eb --- /dev/null +++ b/target/linux/generic/patches-4.9/304-mips_disable_fpu.patch @@ -0,0 +1,106 @@ +From: Manuel Lauss <manuel.lauss@gmail.com> +Subject: [RFC PATCH v4 2/2] MIPS: make FPU emulator optional +Date: Mon, 7 Apr 2014 12:57:04 +0200 +Message-Id: <1396868224-252888-2-git-send-email-manuel.lauss@gmail.com> + +This small patch makes the MIPS FPU emulator optional. The kernel +kills float-users on systems without a hardware FPU by sending a SIGILL. + +Disabling the emulator shrinks vmlinux by about 54kBytes (32bit, +optimizing for size). + +Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com> +--- +v4: rediffed because of patch 1/2, should now work with micromips as well +v3: updated patch description with size savings. +v2: incorporated changes suggested by Jonas Gorski + force the fpu emulator on for micromips: relocating the parts + of the mmips code in the emulator to other areas would be a + much larger change; I went the cheap route instead with this. + + arch/mips/Kbuild | 2 +- + arch/mips/Kconfig | 14 ++++++++++++++ + arch/mips/include/asm/fpu.h | 5 +++-- + arch/mips/include/asm/fpu_emulator.h | 15 +++++++++++++++ + 4 files changed, 33 insertions(+), 3 deletions(-) + +--- a/arch/mips/Kconfig ++++ b/arch/mips/Kconfig +@@ -2891,6 +2891,20 @@ config MIPS_O32_FP64_SUPPORT + + If unsure, say N. + ++config MIPS_FPU_EMULATOR ++ bool "MIPS FPU Emulator" ++ default y ++ help ++ This option lets you disable the built-in MIPS FPU (Coprocessor 1) ++ emulator, which handles floating-point instructions on processors ++ without a hardware FPU. It is generally a good idea to keep the ++ emulator built-in, unless you are perfectly sure you have a ++ complete soft-float environment. With the emulator disabled, all ++ users of float operations will be killed with an illegal instr- ++ uction exception. ++ ++ Say Y, please. ++ + config USE_OF + bool + select OF +--- a/arch/mips/Makefile ++++ b/arch/mips/Makefile +@@ -287,7 +287,7 @@ OBJCOPYFLAGS += --remove-section=.regin + head-y := arch/mips/kernel/head.o + + libs-y += arch/mips/lib/ +-libs-y += arch/mips/math-emu/ ++libs-$(CONFIG_MIPS_FPU_EMULATOR) += arch/mips/math-emu/ + + # See arch/mips/Kbuild for content of core part of the kernel + core-y += arch/mips/ +--- a/arch/mips/include/asm/fpu.h ++++ b/arch/mips/include/asm/fpu.h +@@ -227,8 +227,10 @@ static inline int init_fpu(void) + /* Restore FRE */ + write_c0_config5(config5); + enable_fpu_hazard(); +- } else ++ } else if (IS_ENABLED(CONFIG_MIPS_FPU_EMULATOR)) + fpu_emulator_init_fpu(); ++ else ++ ret = SIGILL; + + return ret; + } +--- a/arch/mips/include/asm/fpu_emulator.h ++++ b/arch/mips/include/asm/fpu_emulator.h +@@ -30,6 +30,7 @@ + #include <asm/local.h> + #include <asm/processor.h> + ++#ifdef CONFIG_MIPS_FPU_EMULATOR + #ifdef CONFIG_DEBUG_FS + + struct mips_fpu_emulator_stats { +@@ -63,6 +64,21 @@ do { \ + extern int fpu_emulator_cop1Handler(struct pt_regs *xcp, + struct mips_fpu_struct *ctx, int has_fpu, + void *__user *fault_addr); ++#else /* no CONFIG_MIPS_FPU_EMULATOR */ ++static inline int do_dsemulret(struct pt_regs *xcp) ++{ ++ return 0; /* 0 means error, should never get here anyway */ ++} ++ ++static inline int fpu_emulator_cop1Handler(struct pt_regs *xcp, ++ struct mips_fpu_struct *ctx, int has_fpu, ++ void *__user *fault_addr) ++{ ++ *fault_addr = NULL; ++ return SIGILL; /* we don't speak MIPS FPU */ ++} ++#endif /* CONFIG_MIPS_FPU_EMULATOR */ ++ + void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr, + struct task_struct *tsk); + int process_fpemu_return(int sig, void __user *fault_addr, |