turn off the Algorithmics FPU emulator by default now that we have software floating point enabled in the toolchain, please recompile your toolchains and kernels
SVN-Revision: 16605
This commit is contained in:
parent
18de35e660
commit
b09970a3d8
4 changed files with 652 additions and 0 deletions
|
@ -0,0 +1,163 @@
|
|||
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>
|
||||
--
|
||||
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
|
||||
index 65d3b19..a467ee5 100644
|
||||
--- a/arch/mips/Kconfig
|
||||
+++ b/arch/mips/Kconfig
|
||||
@@ -811,6 +811,17 @@ config I8259
|
||||
config MIPS_BONITO64
|
||||
bool
|
||||
|
||||
+config MIPS_FPU_EMU
|
||||
+ bool
|
||||
+ default n
|
||||
+ 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
|
||||
|
||||
diff --git a/arch/mips/math-emu/Makefile b/arch/mips/math-emu/Makefile
|
||||
index d547efd..7fdef24 100644
|
||||
--- a/arch/mips/math-emu/Makefile
|
||||
+++ b/arch/mips/math-emu/Makefile
|
||||
@@ -2,12 +2,14 @@
|
||||
# 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-$(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
|
||||
|
||||
EXTRA_CFLAGS += -Werror
|
||||
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
|
||||
index 890f779..9f4c767 100644
|
||||
--- a/arch/mips/math-emu/cp1emu.c
|
||||
+++ b/arch/mips/math-emu/cp1emu.c
|
||||
@@ -56,6 +56,12 @@
|
||||
#endif
|
||||
#define __mips 4
|
||||
|
||||
+/* Further private data for which no space exists in mips_fpu_struct */
|
||||
+
|
||||
+struct mips_fpu_emulator_stats fpuemustats;
|
||||
+
|
||||
+#ifdef CONFIG_MIPS_FPU_EMU
|
||||
+
|
||||
/* Function which emulates a floating point instruction. */
|
||||
|
||||
static int fpu_emu(struct pt_regs *, struct mips_fpu_struct *,
|
||||
@@ -66,10 +72,6 @@ static int fpux_emu(struct pt_regs *,
|
||||
struct mips_fpu_struct *, mips_instruction);
|
||||
#endif
|
||||
|
||||
-/* Further private data for which no space exists in mips_fpu_struct */
|
||||
-
|
||||
-struct mips_fpu_emulator_stats fpuemustats;
|
||||
-
|
||||
/* Control registers */
|
||||
|
||||
#define FPCREG_RID 0 /* $0 = revision id */
|
||||
@@ -1273,6 +1275,13 @@ int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
|
||||
|
||||
return sig;
|
||||
}
|
||||
+#else
|
||||
+int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
|
||||
+ int has_fpu)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+#endif /* CONFIG_MIPS_FPU_EMU */
|
||||
|
||||
#ifdef CONFIG_DEBUG_FS
|
||||
extern struct dentry *mips_debugfs_dir;
|
||||
diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c
|
||||
index df7b9d9..9b42bfd 100644
|
||||
--- a/arch/mips/math-emu/dsemul.c
|
||||
+++ b/arch/mips/math-emu/dsemul.c
|
||||
@@ -109,6 +109,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
|
||||
return SIGILL; /* force out of emulation loop */
|
||||
}
|
||||
|
||||
+#ifdef CONFIG_MIPS_FPU_EMU
|
||||
int do_dsemulret(struct pt_regs *xcp)
|
||||
{
|
||||
struct emuframe __user *fr;
|
||||
@@ -165,3 +166,9 @@ int do_dsemulret(struct pt_regs *xcp)
|
||||
|
||||
return 1;
|
||||
}
|
||||
+#else
|
||||
+int do_dsemulret(struct pt_regs *xcp)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+#endif /* CONFIG_MIPS_FPU_EMU */
|
||||
diff --git a/arch/mips/math-emu/kernel_linkage.c b/arch/mips/math-emu/kernel_linkage.c
|
||||
index 52e6c58..211a399 100644
|
||||
--- 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;
|
||||
@@ -112,4 +113,34 @@ int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
|
||||
|
||||
return err;
|
||||
}
|
||||
-#endif
|
||||
+#endif /* CONFIG_64BIT */
|
||||
+#else
|
||||
+
|
||||
+void fpu_emulator_init_fpu(void)
|
||||
+{
|
||||
+ return;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_save_context(struct sigcontext __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_restore_context(struct sigcontext __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_save_context32(struct sigcontext32 __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+#ifdef CONFIG_64BIT
|
||||
+#endif /* CONFIG_64BIT */
|
||||
+#endif /* CONFIG_MIPS_FPU_EMU */
|
|
@ -0,0 +1,163 @@
|
|||
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>
|
||||
--
|
||||
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
|
||||
index 65d3b19..a467ee5 100644
|
||||
--- a/arch/mips/Kconfig
|
||||
+++ b/arch/mips/Kconfig
|
||||
@@ -811,6 +811,17 @@ config I8259
|
||||
config MIPS_BONITO64
|
||||
bool
|
||||
|
||||
+config MIPS_FPU_EMU
|
||||
+ bool
|
||||
+ default n
|
||||
+ 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
|
||||
|
||||
diff --git a/arch/mips/math-emu/Makefile b/arch/mips/math-emu/Makefile
|
||||
index d547efd..7fdef24 100644
|
||||
--- a/arch/mips/math-emu/Makefile
|
||||
+++ b/arch/mips/math-emu/Makefile
|
||||
@@ -2,12 +2,14 @@
|
||||
# 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-$(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
|
||||
|
||||
EXTRA_CFLAGS += -Werror
|
||||
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
|
||||
index 890f779..9f4c767 100644
|
||||
--- a/arch/mips/math-emu/cp1emu.c
|
||||
+++ b/arch/mips/math-emu/cp1emu.c
|
||||
@@ -56,6 +56,12 @@
|
||||
#endif
|
||||
#define __mips 4
|
||||
|
||||
+/* Further private data for which no space exists in mips_fpu_struct */
|
||||
+
|
||||
+struct mips_fpu_emulator_stats fpuemustats;
|
||||
+
|
||||
+#ifdef CONFIG_MIPS_FPU_EMU
|
||||
+
|
||||
/* Function which emulates a floating point instruction. */
|
||||
|
||||
static int fpu_emu(struct pt_regs *, struct mips_fpu_struct *,
|
||||
@@ -66,10 +72,6 @@ static int fpux_emu(struct pt_regs *,
|
||||
struct mips_fpu_struct *, mips_instruction);
|
||||
#endif
|
||||
|
||||
-/* Further private data for which no space exists in mips_fpu_struct */
|
||||
-
|
||||
-struct mips_fpu_emulator_stats fpuemustats;
|
||||
-
|
||||
/* Control registers */
|
||||
|
||||
#define FPCREG_RID 0 /* $0 = revision id */
|
||||
@@ -1273,6 +1275,13 @@ int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
|
||||
|
||||
return sig;
|
||||
}
|
||||
+#else
|
||||
+int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
|
||||
+ int has_fpu)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+#endif /* CONFIG_MIPS_FPU_EMU */
|
||||
|
||||
#ifdef CONFIG_DEBUG_FS
|
||||
extern struct dentry *mips_debugfs_dir;
|
||||
diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c
|
||||
index df7b9d9..9b42bfd 100644
|
||||
--- a/arch/mips/math-emu/dsemul.c
|
||||
+++ b/arch/mips/math-emu/dsemul.c
|
||||
@@ -109,6 +109,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
|
||||
return SIGILL; /* force out of emulation loop */
|
||||
}
|
||||
|
||||
+#ifdef CONFIG_MIPS_FPU_EMU
|
||||
int do_dsemulret(struct pt_regs *xcp)
|
||||
{
|
||||
struct emuframe __user *fr;
|
||||
@@ -165,3 +166,9 @@ int do_dsemulret(struct pt_regs *xcp)
|
||||
|
||||
return 1;
|
||||
}
|
||||
+#else
|
||||
+int do_dsemulret(struct pt_regs *xcp)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+#endif /* CONFIG_MIPS_FPU_EMU */
|
||||
diff --git a/arch/mips/math-emu/kernel_linkage.c b/arch/mips/math-emu/kernel_linkage.c
|
||||
index 52e6c58..211a399 100644
|
||||
--- 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;
|
||||
@@ -112,4 +113,34 @@ int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
|
||||
|
||||
return err;
|
||||
}
|
||||
-#endif
|
||||
+#endif /* CONFIG_64BIT */
|
||||
+#else
|
||||
+
|
||||
+void fpu_emulator_init_fpu(void)
|
||||
+{
|
||||
+ return;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_save_context(struct sigcontext __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_restore_context(struct sigcontext __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_save_context32(struct sigcontext32 __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+#ifdef CONFIG_64BIT
|
||||
+#endif /* CONFIG_64BIT */
|
||||
+#endif /* CONFIG_MIPS_FPU_EMU */
|
|
@ -0,0 +1,163 @@
|
|||
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>
|
||||
--
|
||||
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
|
||||
index 65d3b19..a467ee5 100644
|
||||
--- a/arch/mips/Kconfig
|
||||
+++ b/arch/mips/Kconfig
|
||||
@@ -811,6 +811,17 @@ config I8259
|
||||
config MIPS_BONITO64
|
||||
bool
|
||||
|
||||
+config MIPS_FPU_EMU
|
||||
+ bool
|
||||
+ default n
|
||||
+ 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
|
||||
|
||||
diff --git a/arch/mips/math-emu/Makefile b/arch/mips/math-emu/Makefile
|
||||
index d547efd..7fdef24 100644
|
||||
--- a/arch/mips/math-emu/Makefile
|
||||
+++ b/arch/mips/math-emu/Makefile
|
||||
@@ -2,12 +2,14 @@
|
||||
# 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-$(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
|
||||
|
||||
EXTRA_CFLAGS += -Werror
|
||||
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
|
||||
index 890f779..9f4c767 100644
|
||||
--- a/arch/mips/math-emu/cp1emu.c
|
||||
+++ b/arch/mips/math-emu/cp1emu.c
|
||||
@@ -56,6 +56,12 @@
|
||||
#endif
|
||||
#define __mips 4
|
||||
|
||||
+/* Further private data for which no space exists in mips_fpu_struct */
|
||||
+
|
||||
+struct mips_fpu_emulator_stats fpuemustats;
|
||||
+
|
||||
+#ifdef CONFIG_MIPS_FPU_EMU
|
||||
+
|
||||
/* Function which emulates a floating point instruction. */
|
||||
|
||||
static int fpu_emu(struct pt_regs *, struct mips_fpu_struct *,
|
||||
@@ -66,10 +72,6 @@ static int fpux_emu(struct pt_regs *,
|
||||
struct mips_fpu_struct *, mips_instruction);
|
||||
#endif
|
||||
|
||||
-/* Further private data for which no space exists in mips_fpu_struct */
|
||||
-
|
||||
-struct mips_fpu_emulator_stats fpuemustats;
|
||||
-
|
||||
/* Control registers */
|
||||
|
||||
#define FPCREG_RID 0 /* $0 = revision id */
|
||||
@@ -1273,6 +1275,13 @@ int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
|
||||
|
||||
return sig;
|
||||
}
|
||||
+#else
|
||||
+int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
|
||||
+ int has_fpu)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+#endif /* CONFIG_MIPS_FPU_EMU */
|
||||
|
||||
#ifdef CONFIG_DEBUG_FS
|
||||
extern struct dentry *mips_debugfs_dir;
|
||||
diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c
|
||||
index df7b9d9..9b42bfd 100644
|
||||
--- a/arch/mips/math-emu/dsemul.c
|
||||
+++ b/arch/mips/math-emu/dsemul.c
|
||||
@@ -109,6 +109,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
|
||||
return SIGILL; /* force out of emulation loop */
|
||||
}
|
||||
|
||||
+#ifdef CONFIG_MIPS_FPU_EMU
|
||||
int do_dsemulret(struct pt_regs *xcp)
|
||||
{
|
||||
struct emuframe __user *fr;
|
||||
@@ -165,3 +166,9 @@ int do_dsemulret(struct pt_regs *xcp)
|
||||
|
||||
return 1;
|
||||
}
|
||||
+#else
|
||||
+int do_dsemulret(struct pt_regs *xcp)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+#endif /* CONFIG_MIPS_FPU_EMU */
|
||||
diff --git a/arch/mips/math-emu/kernel_linkage.c b/arch/mips/math-emu/kernel_linkage.c
|
||||
index 52e6c58..211a399 100644
|
||||
--- 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;
|
||||
@@ -112,4 +113,34 @@ int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
|
||||
|
||||
return err;
|
||||
}
|
||||
-#endif
|
||||
+#endif /* CONFIG_64BIT */
|
||||
+#else
|
||||
+
|
||||
+void fpu_emulator_init_fpu(void)
|
||||
+{
|
||||
+ return;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_save_context(struct sigcontext __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_restore_context(struct sigcontext __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_save_context32(struct sigcontext32 __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+#ifdef CONFIG_64BIT
|
||||
+#endif /* CONFIG_64BIT */
|
||||
+#endif /* CONFIG_MIPS_FPU_EMU */
|
|
@ -0,0 +1,163 @@
|
|||
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>
|
||||
--
|
||||
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
|
||||
index 65d3b19..a467ee5 100644
|
||||
--- a/arch/mips/Kconfig
|
||||
+++ b/arch/mips/Kconfig
|
||||
@@ -811,6 +811,17 @@ config I8259
|
||||
config MIPS_BONITO64
|
||||
bool
|
||||
|
||||
+config MIPS_FPU_EMU
|
||||
+ bool
|
||||
+ default n
|
||||
+ 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
|
||||
|
||||
diff --git a/arch/mips/math-emu/Makefile b/arch/mips/math-emu/Makefile
|
||||
index d547efd..7fdef24 100644
|
||||
--- a/arch/mips/math-emu/Makefile
|
||||
+++ b/arch/mips/math-emu/Makefile
|
||||
@@ -2,12 +2,14 @@
|
||||
# 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-$(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
|
||||
|
||||
EXTRA_CFLAGS += -Werror
|
||||
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
|
||||
index 890f779..9f4c767 100644
|
||||
--- a/arch/mips/math-emu/cp1emu.c
|
||||
+++ b/arch/mips/math-emu/cp1emu.c
|
||||
@@ -56,6 +56,12 @@
|
||||
#endif
|
||||
#define __mips 4
|
||||
|
||||
+/* Further private data for which no space exists in mips_fpu_struct */
|
||||
+
|
||||
+struct mips_fpu_emulator_stats fpuemustats;
|
||||
+
|
||||
+#ifdef CONFIG_MIPS_FPU_EMU
|
||||
+
|
||||
/* Function which emulates a floating point instruction. */
|
||||
|
||||
static int fpu_emu(struct pt_regs *, struct mips_fpu_struct *,
|
||||
@@ -66,10 +72,6 @@ static int fpux_emu(struct pt_regs *,
|
||||
struct mips_fpu_struct *, mips_instruction);
|
||||
#endif
|
||||
|
||||
-/* Further private data for which no space exists in mips_fpu_struct */
|
||||
-
|
||||
-struct mips_fpu_emulator_stats fpuemustats;
|
||||
-
|
||||
/* Control registers */
|
||||
|
||||
#define FPCREG_RID 0 /* $0 = revision id */
|
||||
@@ -1273,6 +1275,13 @@ int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
|
||||
|
||||
return sig;
|
||||
}
|
||||
+#else
|
||||
+int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
|
||||
+ int has_fpu)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+#endif /* CONFIG_MIPS_FPU_EMU */
|
||||
|
||||
#ifdef CONFIG_DEBUG_FS
|
||||
extern struct dentry *mips_debugfs_dir;
|
||||
diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c
|
||||
index df7b9d9..9b42bfd 100644
|
||||
--- a/arch/mips/math-emu/dsemul.c
|
||||
+++ b/arch/mips/math-emu/dsemul.c
|
||||
@@ -109,6 +109,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
|
||||
return SIGILL; /* force out of emulation loop */
|
||||
}
|
||||
|
||||
+#ifdef CONFIG_MIPS_FPU_EMU
|
||||
int do_dsemulret(struct pt_regs *xcp)
|
||||
{
|
||||
struct emuframe __user *fr;
|
||||
@@ -165,3 +166,9 @@ int do_dsemulret(struct pt_regs *xcp)
|
||||
|
||||
return 1;
|
||||
}
|
||||
+#else
|
||||
+int do_dsemulret(struct pt_regs *xcp)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+#endif /* CONFIG_MIPS_FPU_EMU */
|
||||
diff --git a/arch/mips/math-emu/kernel_linkage.c b/arch/mips/math-emu/kernel_linkage.c
|
||||
index 52e6c58..211a399 100644
|
||||
--- 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;
|
||||
@@ -112,4 +113,34 @@ int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
|
||||
|
||||
return err;
|
||||
}
|
||||
-#endif
|
||||
+#endif /* CONFIG_64BIT */
|
||||
+#else
|
||||
+
|
||||
+void fpu_emulator_init_fpu(void)
|
||||
+{
|
||||
+ return;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_save_context(struct sigcontext __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_restore_context(struct sigcontext __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_save_context32(struct sigcontext32 __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
|
||||
+{
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+#ifdef CONFIG_64BIT
|
||||
+#endif /* CONFIG_64BIT */
|
||||
+#endif /* CONFIG_MIPS_FPU_EMU */
|
Loading…
Reference in a new issue