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authorRafał Miłecki <zajec5@gmail.com>2015-02-23 22:59:53 +0000
committerRafał Miłecki <zajec5@gmail.com>2015-02-23 22:59:53 +0000
commit1c063070cf6bc2b81674f60b6ad6ae0ee9b4152f (patch)
tree0a83cfa5ea98e519ade4fa7f4e8a859e26bd737c /target/linux/generic/patches-4.0/304-mips_disable_fpu.patch
parentad077832bfb03106a02b7be02b560c13e77d0436 (diff)
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generic: early (incomplete!) 4.0 support
Signed-off-by: Rafał Miłecki <zajec5@gmail.com> SVN-Revision: 44511
Diffstat (limited to 'target/linux/generic/patches-4.0/304-mips_disable_fpu.patch')
-rw-r--r--target/linux/generic/patches-4.0/304-mips_disable_fpu.patch105
1 files changed, 105 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.0/304-mips_disable_fpu.patch b/target/linux/generic/patches-4.0/304-mips_disable_fpu.patch
new file mode 100644
index 0000000000..268006caee
--- /dev/null
+++ b/target/linux/generic/patches-4.0/304-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
+@@ -2586,6 +2586,20 @@ 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
+@@ -286,7 +286,7 @@ 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
+@@ -211,8 +211,10 @@ 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 {
+@@ -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);