diff options
Diffstat (limited to 'target/linux/generic/patches-3.14/304-mips_disable_fpu.patch')
| -rw-r--r-- | target/linux/generic/patches-3.14/304-mips_disable_fpu.patch | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/target/linux/generic/patches-3.14/304-mips_disable_fpu.patch b/target/linux/generic/patches-3.14/304-mips_disable_fpu.patch deleted file mode 100644 index 4536ce6..0000000 --- a/target/linux/generic/patches-3.14/304-mips_disable_fpu.patch +++ /dev/null @@ -1,160 +0,0 @@ -MIPS: allow disabling the kernel FPU emulator - -This patch allows turning off the in-kernel Algorithmics -FPU emulator support, which allows one to save a couple of -precious blocks on an embedded system. - -Signed-off-by: Florian Fainelli <florian@openwrt.org> --- ---- a/arch/mips/Kconfig -+++ b/arch/mips/Kconfig -@@ -934,6 +934,17 @@ config I8259 - config MIPS_BONITO64 - bool - -+config MIPS_FPU_EMU -+ bool "Enable FPU emulation" -+ default y -+ help -+ This option allows building a kernel with or without the Algorithmics -+ FPU emulator enabled. Turning off this option results in a kernel which -+ does not catch floating operations exceptions. Make sure that your toolchain -+ is configured to enable software floating point emulation in that case. -+ -+ If unsure say Y here. -+ - config MIPS_MSC - bool - ---- a/arch/mips/math-emu/Makefile -+++ b/arch/mips/math-emu/Makefile -@@ -2,10 +2,12 @@ - # Makefile for the Linux/MIPS kernel FPU emulation. - # - --obj-y := cp1emu.o ieee754m.o ieee754d.o ieee754dp.o ieee754sp.o ieee754.o \ -+obj-y := kernel_linkage.o -+ -+obj-$(CONFIG_MIPS_FPU_EMU) += ieee754m.o ieee754d.o ieee754dp.o ieee754sp.o ieee754.o \ - ieee754xcpt.o dp_frexp.o dp_modf.o dp_div.o dp_mul.o dp_sub.o \ - dp_add.o dp_fsp.o dp_cmp.o dp_logb.o dp_scalb.o dp_simple.o \ - dp_tint.o dp_fint.o dp_tlong.o dp_flong.o sp_frexp.o sp_modf.o \ - sp_div.o sp_mul.o sp_sub.o sp_add.o sp_fdp.o sp_cmp.o sp_logb.o \ - sp_scalb.o sp_simple.o sp_tint.o sp_fint.o sp_tlong.o sp_flong.o \ -- dp_sqrt.o sp_sqrt.o kernel_linkage.o dsemul.o -+ dp_sqrt.o sp_sqrt.o dsemul.o cp1emu.o ---- a/arch/mips/math-emu/kernel_linkage.c -+++ b/arch/mips/math-emu/kernel_linkage.c -@@ -29,6 +29,7 @@ - - #define SIGNALLING_NAN 0x7ff800007ff80000LL - -+#ifdef CONFIG_MIPS_FPU_EMU - void fpu_emulator_init_fpu(void) - { - static int first = 1; -@@ -115,3 +116,36 @@ int fpu_emulator_restore_context32(struc - return err; - } - #endif -+ -+#else -+ -+void fpu_emulator_init_fpu(void) -+{ -+ printk(KERN_INFO "FPU emulator disabled, make sure your toolchain" -+ "was compiled with software floating point support (soft-float)\n"); -+ return; -+} -+ -+int fpu_emulator_save_context(struct sigcontext __user *sc) -+{ -+ return 0; -+} -+ -+int fpu_emulator_restore_context(struct sigcontext __user *sc) -+{ -+ return 0; -+} -+ -+#ifdef CONFIG_64BIT -+int fpu_emulator_save_context32(struct sigcontext32 __user *sc) -+{ -+ return 0; -+} -+ -+int fpu_emulator_restore_context32(struct sigcontext32 __user *sc) -+{ -+ return 0; -+} -+#endif /* CONFIG_64BIT */ -+ -+#endif /* CONFIG_MIPS_FPU_EMU */ ---- a/arch/mips/include/asm/fpu_emulator.h -+++ b/arch/mips/include/asm/fpu_emulator.h -@@ -27,6 +27,8 @@ - #include <asm/inst.h> - #include <asm/local.h> - -+#ifdef CONFIG_MIPS_FPU_EMU -+ - #ifdef CONFIG_DEBUG_FS - - struct mips_fpu_emulator_stats { -@@ -60,6 +62,38 @@ extern int fpu_emulator_cop1Handler(stru - int process_fpemu_return(int sig, void __user *fault_addr); - int mm_isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn, - unsigned long *contpc); -+#else -+static inline int mips_dsemul(struct pt_regs *regs, mips_instruction ir, -+ unsigned long cpc) -+{ -+ return 0; -+} -+ -+static inline int do_dsemulret(struct pt_regs *xcp) -+{ -+ return 0; -+} -+ -+static inline int fpu_emulator_cop1Handler(struct pt_regs *xcp, -+ struct mips_fpu_struct *ctx, -+ int has_fpu, -+ void *__user *fault_addr) -+{ -+ return 0; -+} -+ -+static inline int process_fpemu_return(int sig, void __user *fault_addr) -+{ -+ return -EINVAL; -+} -+ -+static inline int mm_isBranchInstr(struct pt_regs *regs, -+ struct mm_decoded_insn dec_insn, -+ unsigned long *contpc) -+{ -+ return 0; -+} -+#endif /* CONFIG_MIPS_FPU_EMU */ - - /* - * Instruction inserted following the badinst to further tag the sequence ---- a/arch/mips/kernel/traps.c -+++ b/arch/mips/kernel/traps.c -@@ -701,6 +701,7 @@ asmlinkage void do_ov(struct pt_regs *re - exception_exit(prev_state); - } - -+#ifdef CONFIG_MIPS_FPU_EMU - int process_fpemu_return(int sig, void __user *fault_addr) - { - if (sig == SIGSEGV || sig == SIGBUS) { -@@ -724,6 +725,7 @@ int process_fpemu_return(int sig, void _ - return 0; - } - } -+#endif /* CONFIG_MIPS_FPU_EMU */ - - /* - * XXX Delayed fp exceptions when doing a lazy ctx switch XXX |