diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index aad8532a718eac68df1d81074557b49adbdf3323..8d12da224cb99af3b8e81eb90905fd87996c766d 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -422,6 +422,7 @@ config HUGETLB_PAGE_SIZE_VARIABLE
config MATH_EMULATION
bool "Math emulation"
depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
+ select PPC_FPU_REGS
help
Some PowerPC chips designed for embedded applications do not have
a floating-point unit and therefore do not implement the
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 333e3b6c76fb63a0025d3f74bf6b6b9a7fea3c06..0792530bedefb284c38769d2a6e5e80170c4bd19 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -164,8 +164,10 @@ struct thread_struct {
#endif
/* Debug Registers */
struct debug_reg debug;
+#ifdef CONFIG_PPC_FPU_REGS
struct thread_fp_state fp_state;
struct thread_fp_state *fp_save_area;
+#endif
int fpexc_mode; /* floating-point exception mode */
unsigned int align_ctl; /* alignment handling control */
#ifdef CONFIG_HAVE_HW_BREAKPOINT
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index a2dcb8ed79b9ec27dc3dcf51a102ab2df8d8cf44..81d68494d02683b9dd9167062804164aad0dbfd4 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -110,9 +110,11 @@ int main(void)
#ifdef CONFIG_BOOKE
OFFSET(THREAD_NORMSAVES, thread_struct, normsave[0]);
#endif
+#ifdef CONFIG_PPC_FPU
OFFSET(THREAD_FPEXC_MODE, thread_struct, fpexc_mode);
OFFSET(THREAD_FPSTATE, thread_struct, fp_state.fpr);
OFFSET(THREAD_FPSAVEAREA, thread_struct, fp_save_area);
+#endif
OFFSET(FPSTATE_FPSCR, thread_fp_state, fpscr);
OFFSET(THREAD_LOAD_FP, thread_struct, load_fp);
#ifdef CONFIG_ALTIVEC
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index d421a2c7f822469e3ff54d557fee5e6fa982e05b..ba2c987b840395c0f6a6f8083f5683996abbc64d 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1730,7 +1730,9 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
p->thread.ptrace_bps[i] = NULL;
#endif
+#ifdef CONFIG_PPC_FPU_REGS
p->thread.fp_save_area = NULL;
+#endif
#ifdef CONFIG_ALTIVEC
p->thread.vr_save_area = NULL;
#endif
@@ -1855,8 +1857,10 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
#endif
current->thread.load_slb = 0;
current->thread.load_fp = 0;
+#ifdef CONFIG_PPC_FPU_REGS
memset(¤t->thread.fp_state, 0, sizeof(current->thread.fp_state));
current->thread.fp_save_area = NULL;
+#endif
#ifdef CONFIG_ALTIVEC
memset(¤t->thread.vr_state, 0, sizeof(current->thread.vr_state));
current->thread.vr_state.vscr.u[3] = 0x00010000; /* Java mode disabled */
diff --git a/arch/powerpc/kernel/ptrace/Makefile b/arch/powerpc/kernel/ptrace/Makefile
index 77abd1a5a508d0a6c6a7a0b0cd37a867e9ce2731..8ebc11d1168d8a5b4ac95a420b4a0b1b13988290 100644
--- a/arch/powerpc/kernel/ptrace/Makefile
+++ b/arch/powerpc/kernel/ptrace/Makefile
@@ -6,11 +6,11 @@
CFLAGS_ptrace-view.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
obj-y += ptrace.o ptrace-view.o
-obj-y += ptrace-fpu.o
+obj-$(CONFIG_PPC_FPU_REGS) += ptrace-fpu.o
obj-$(CONFIG_COMPAT) += ptrace32.o
obj-$(CONFIG_VSX) += ptrace-vsx.o
ifneq ($(CONFIG_VSX),y)
-obj-y += ptrace-novsx.o
+obj-$(CONFIG_PPC_FPU_REGS) += ptrace-novsx.o
endif
obj-$(CONFIG_ALTIVEC) += ptrace-altivec.o
obj-$(CONFIG_SPE) += ptrace-spe.o
diff --git a/arch/powerpc/kernel/ptrace/ptrace-decl.h b/arch/powerpc/kernel/ptrace/ptrace-decl.h
index eafe5f0f62898cc07f0e761111b2039ed5692133..3487f2c9735c65d649738a73f7eccf1b3675b292 100644
--- a/arch/powerpc/kernel/ptrace/ptrace-decl.h
+++ b/arch/powerpc/kernel/ptrace/ptrace-decl.h
@@ -165,8 +165,22 @@ int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data);
extern const struct user_regset_view user_ppc_native_view;
/* ptrace-fpu */
+#ifdef CONFIG_PPC_FPU_REGS
int ptrace_get_fpr(struct task_struct *child, int index, unsigned long *data);
int ptrace_put_fpr(struct task_struct *child, int index, unsigned long data);
+#else
+static inline int
+ptrace_get_fpr(struct task_struct *child, int index, unsigned long *data)
+{
+ return -EIO;
+}
+
+static inline int
+ptrace_put_fpr(struct task_struct *child, int index, unsigned long data)
+{
+ return -EIO;
+}
+#endif
/* ptrace-(no)adv */
void ppc_gethwdinfo(struct ppc_debug_info *dbginfo);
diff --git a/arch/powerpc/kernel/ptrace/ptrace-view.c b/arch/powerpc/kernel/ptrace/ptrace-view.c
index 142d58337f40d8c1894752ee518da8f6e69e0fb4..00a765f00d3192e6e0a599b92edd0d6c549a2d60 100644
--- a/arch/powerpc/kernel/ptrace/ptrace-view.c
+++ b/arch/powerpc/kernel/ptrace/ptrace-view.c
@@ -521,11 +521,13 @@ static const struct user_regset native_regsets[] = {
.size = sizeof(long), .align = sizeof(long),
.regset_get = gpr_get, .set = gpr_set
},
+#ifdef CONFIG_PPC_FPU_REGS
[REGSET_FPR] = {
.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
.size = sizeof(double), .align = sizeof(double),
.regset_get = fpr_get, .set = fpr_set
},
+#endif
#ifdef CONFIG_ALTIVEC
[REGSET_VMX] = {
.core_note_type = NT_PPC_VMX, .n = 34,
diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h
index 4626d39cc0f0a9c474f54f683e91bf0b157c4d81..6c2a33ab042c22ceb0d541089903cecab05e1881 100644
--- a/arch/powerpc/kernel/signal.h
+++ b/arch/powerpc/kernel/signal.h
@@ -34,7 +34,7 @@ unsigned long copy_fpr_to_user(void __user *to, struct task_struct *task);
unsigned long copy_ckfpr_to_user(void __user *to, struct task_struct *task);
unsigned long copy_fpr_from_user(struct task_struct *task, void __user *from);
unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from);
-#else
+#elif defined(CONFIG_PPC_FPU_REGS)
static inline unsigned long
copy_fpr_to_user(void __user *to, struct task_struct *task)
{
@@ -63,6 +63,18 @@ copy_ckfpr_from_user(struct task_struct *task, void __user *from)
ELF_NFPREG * sizeof(double));
}
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
+#else
+static inline unsigned long
+copy_fpr_to_user(void __user *to, struct task_struct *task)
+{
+ return 0;
+}
+
+static inline unsigned long
+copy_fpr_from_user(struct task_struct *task, void __user *from)
+{
+ return 0;
+}
#endif
#ifdef CONFIG_PPC64
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 96950f189b5a1919385663a6de120b4549de511d..7b291707eb31033fb6ac684bf31ab390b8e66e11 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -814,7 +814,9 @@ int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
}
regs->link = tramp;
+#ifdef CONFIG_PPC_FPU_REGS
tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
+#endif
/* create a stack frame for the caller of the handler */
newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
@@ -1271,7 +1273,9 @@ int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
regs->link = tramp;
+#ifdef CONFIG_PPC_FPU_REGS
tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
+#endif
/* create a stack frame for the caller of the handler */
newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 5006dcbe1d9fdb4df84e0e6cccc0f0004fe6af48..5b39baa615901d3d3a36d31dd37a01f2e13e51ad 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -1190,7 +1190,9 @@ static void parse_fpe(struct pt_regs *regs)
flush_fp_to_thread(current);
+#ifdef CONFIG_PPC_FPU_REGS
code = __parse_fpscr(current->thread.fp_state.fpscr);
+#endif
_exception(SIGFPE, regs, code, regs->nip);
}
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index c194c4ae8bc7d0a4e5f714a5bcff93a1bda3fa32..3e36e3712deb746a1bc5d1e75a9c53187a2462dd 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -218,9 +218,13 @@ config PPC_E500MC
such as e5500/e6500), and must be disabled for running on
e500v1 or e500v2.
+config PPC_FPU_REGS
+ bool
+
config PPC_FPU
bool
default y if PPC64
+ select PPC_FPU_REGS
config FSL_EMB_PERFMON
bool "Freescale Embedded Perfmon"