kernel/3.10: rework MIPS FPU emulation disable patch

Get rid of some ifdefs, and make sure that the microMIPS
specific code is disabled as well.

Signed-off-by: Gabor Juhos <[email protected]>

SVN-Revision: 37506

target/linux/generic/patches-3.10/304-mips_disable_fpu.patch

@@ -20,7 +20,7 @@ Signed-off-by: Florian Fainelli <[email protected]>
 +	   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
@@ -28,12 +28,13 @@ Signed-off-by: Florian Fainelli <[email protected]>
  
 --- a/arch/mips/math-emu/Makefile
 +++ b/arch/mips/math-emu/Makefile
-@@ -2,10 +2,11 @@
+@@ -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 dsemul.o cp1emu.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 \
@@ -41,121 +42,7 @@ Signed-off-by: Florian Fainelli <[email protected]>
  	   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
---- a/arch/mips/math-emu/cp1emu.c
-+++ b/arch/mips/math-emu/cp1emu.c
-@@ -59,7 +59,11 @@
- #define __mips 4
- 
- /* Function which emulates a floating point instruction. */
-+#ifdef CONFIG_DEBUG_FS
-+DEFINE_PER_CPU(struct mips_fpu_emulator_stats, fpuemustats);
-+#endif
- 
-+#ifdef CONFIG_MIPS_FPU_EMU
- static int fpu_emu(struct pt_regs *, struct mips_fpu_struct *,
- 	mips_instruction);
- 
-@@ -70,10 +74,6 @@ static int fpux_emu(struct pt_regs *,
- 
- /* Further private data for which no space exists in mips_fpu_struct */
- 
--#ifdef CONFIG_DEBUG_FS
--DEFINE_PER_CPU(struct mips_fpu_emulator_stats, fpuemustats);
--#endif
--
- /* Control registers */
- 
- #define FPCREG_RID	0	/* $0  = revision id */
-@@ -82,11 +82,15 @@ DEFINE_PER_CPU(struct mips_fpu_emulator_
- /* Determine rounding mode from the RM bits of the FCSR */
- #define modeindex(v) ((v) & FPU_CSR_RM)
- 
-+#endif /* CONFIG_MIPS_FPU_EMU */
-+
- /* microMIPS bitfields */
- #define MM_POOL32A_MINOR_MASK	0x3f
- #define MM_POOL32A_MINOR_SHIFT	0x6
- #define MM_MIPS32_COND_FC	0x30
- 
-+#ifdef CONFIG_MIPS_FPU_EMU
-+
- /* Convert Mips rounding mode (0..3) to IEEE library modes. */
- static const unsigned char ieee_rm[4] = {
- 	[FPU_CSR_RN] = IEEE754_RN,
-@@ -116,9 +120,13 @@ static const unsigned int fpucondbit[8]
- };
- #endif
- 
-+#endif /* CONFIG_MIPS_FPU_EMU */
-+
- /* (microMIPS) Convert 16-bit register encoding to 32-bit register encoding. */
- static const unsigned int reg16to32map[8] = {16, 17, 2, 3, 4, 5, 6, 7};
- 
-+#ifdef CONFIG_MIPS_FPU_EMU
-+
- /* (microMIPS) Convert certain microMIPS instructions to MIPS32 format. */
- static const int sd_format[] = {16, 17, 0, 0, 0, 0, 0, 0};
- static const int sdps_format[] = {16, 17, 22, 0, 0, 0, 0, 0};
-@@ -463,6 +471,8 @@ static int microMIPS32_to_MIPS32(union m
- 	return 0;
- }
- 
-+#endif /* CONFIG_MIPS_FPU_EMU */
-+
- int mm_isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn,
- 		     unsigned long *contpc)
- {
-@@ -667,6 +677,8 @@ int mm_isBranchInstr(struct pt_regs *reg
- 	return 0;
- }
- 
-+#ifdef CONFIG_MIPS_FPU_EMU
-+
- /*
-  * Redundant with logic already in kernel/branch.c,
-  * embedded in compute_return_epc.  At some point,
-@@ -2102,7 +2114,6 @@ int fpu_emulator_cop1Handler(struct pt_r
- 
- 	return sig;
- }
--
- #ifdef CONFIG_DEBUG_FS
- 
- static int fpuemu_stat_get(void *data, u64 *val)
-@@ -2151,4 +2162,11 @@ static int __init debugfs_fpuemu(void)
- 	return 0;
- }
- __initcall(debugfs_fpuemu);
--#endif
-+#endif /* CONFIG_DEBUGFS */
-+#else
-+int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
-+        int has_fpu, void *__user *fault_addr)
-+{
-+	return 0;
-+}
-+#endif /* CONFIG_MIPS_FPU_EMU */
---- a/arch/mips/math-emu/dsemul.c
-+++ b/arch/mips/math-emu/dsemul.c
-@@ -119,6 +119,7 @@ int mips_dsemul(struct pt_regs *regs, mi
- 	return SIGILL;		/* force out of emulation loop */
- }
- 
-+#ifdef CONFIG_MIPS_FPU_EMU
- int do_dsemulret(struct pt_regs *xcp)
- {
- 	struct emuframe __user *fr;
-@@ -182,3 +183,9 @@ int do_dsemulret(struct pt_regs *xcp)
- 
- 	return 1;
- }
-+#else
-+int do_dsemulret(struct pt_regs *xcp)
-+{
-+	return 0;
-+}
-+#endif /* CONFIG_MIPS_FPU_EMU */
++	   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 @@
@@ -166,12 +53,11 @@ Signed-off-by: Florian Fainelli <[email protected]>
  void fpu_emulator_init_fpu(void)
  {
  	static int first = 1;
-@@ -112,4 +113,36 @@ int fpu_emulator_restore_context32(struc
- 
+@@ -113,3 +114,36 @@ int fpu_emulator_restore_context32(struc
  	return err;
  }
--#endif
-+#endif	/* CONFIG_64BIT */
+ #endif
++
 +#else
 +
 +void fpu_emulator_init_fpu(void)
@@ -191,6 +77,7 @@ Signed-off-by: Florian Fainelli <[email protected]>
 +	return 0;
 +}
 +
++#ifdef CONFIG_64BIT
 +int fpu_emulator_save_context32(struct sigcontext32 __user *sc)
 +{
 +	return 0;
@@ -200,7 +87,74 @@ Signed-off-by: Florian Fainelli <[email protected]>
 +{
 +	return 0;
 +}
++#endif /* CONFIG_64BIT */
 +
-+#ifdef CONFIG_64BIT
-+#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
+@@ -684,6 +684,7 @@ asmlinkage void do_ov(struct pt_regs *re
+ 	force_sig_info(SIGFPE, &info, current);
+ }
+ 
++#ifdef CONFIG_MIPS_FPU_EMU
+ int process_fpemu_return(int sig, void __user *fault_addr)
+ {
+ 	if (sig == SIGSEGV || sig == SIGBUS) {
+@@ -707,6 +708,7 @@ 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