X-Git-Url: http://git.openwrt.org/?p=openwrt%2Fstaging%2Fdedeckeh.git;a=blobdiff_plain;f=target%2Flinux%2Fgeneric%2Fpending-4.9%2F304-mips_disable_fpu.patch;fp=target%2Flinux%2Fgeneric%2Fpending-4.9%2F304-mips_disable_fpu.patch;h=0000000000000000000000000000000000000000;hp=b59b9feee945f54558fb64e2da3354dbcd6a7c3a;hb=57a9633a2c6c3be56c794576157f057a70ac52df;hpb=28fd4ac512ec1c08a79ac7a434b2def3cc82f1d5

diff --git a/target/linux/generic/pending-4.9/304-mips_disable_fpu.patch b/target/linux/generic/pending-4.9/304-mips_disable_fpu.patch
deleted file mode 100644
index b59b9feee9..0000000000
--- a/target/linux/generic/pending-4.9/304-mips_disable_fpu.patch
+++ /dev/null
@@ -1,137 +0,0 @@
-From:   Manuel Lauss <manuel.lauss@gmail.com>
-Subject: [RFC PATCH v4 2/2] MIPS: make FPU emulator optional
-
-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
-@@ -2890,6 +2890,20 @@ 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 +64,16 @@ 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 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,
---- a/arch/mips/include/asm/dsemul.h
-+++ b/arch/mips/include/asm/dsemul.h
-@@ -41,6 +41,7 @@ struct task_struct;
- extern int mips_dsemul(struct pt_regs *regs, mips_instruction ir,
- 		       unsigned long branch_pc, unsigned long cont_pc);
- 
-+#ifdef CONFIG_MIPS_FPU_EMULATOR
- /**
-  * do_dsemulret() - Return from a delay slot 'emulation' frame
-  * @xcp:	User thread register context.
-@@ -88,5 +89,27 @@ extern bool dsemul_thread_rollback(struc
-  * before @mm is freed in order to avoid memory leaks.
-  */
- extern void dsemul_mm_cleanup(struct mm_struct *mm);
-+#else
-+static inline bool do_dsemulret(struct pt_regs *xcp)
-+{
-+	return false;
-+}
-+
-+static inline bool dsemul_thread_cleanup(struct task_struct *tsk)
-+{
-+	return false;
-+}
-+
-+static inline bool dsemul_thread_rollback(struct pt_regs *regs)
-+{
-+	return false;
-+}
-+
-+static inline void dsemul_mm_cleanup(struct mm_struct *mm)
-+{
-+
-+}
-+
-+#endif
- 
- #endif /* __MIPS_ASM_DSEMUL_H__ */