generic: add preliminary 3.19 support

Signed-off-by: Imre Kaloz <kaloz@openwrt.org> SVN-Revision: 44126
2015-01-25 15:20:39 +00:00
parent a46bb6ec6a
commit d26694243a
177 changed files with 31700 additions and 0 deletions
--- a/target/linux/generic/patches-3.19/304-mips_disable_fpu.patch
+++ b/target/linux/generic/patches-3.19/304-mips_disable_fpu.patch
@@ -0,0 +1,105 @@
+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
+@@ -2521,6 +2521,20 @@ 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
+@@ -275,7 +275,7 @@ 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
+@@ -201,8 +201,10 @@ static inline int init_fpu(void)
+ 			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 {
+@@ -65,6 +66,20 @@ extern int do_dsemulret(struct pt_regs *
+ 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)
+{
+	return SIGILL;	/* we don't speak MIPS FPU */
+}
+#endif	/* CONFIG_MIPS_FPU_EMULATOR */
+
+ 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);