5 files changed, 19 insertions, 4 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 291c95ac4b31..0b2d05da89d7 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -706,7 +706,7 @@ config FORCE_MAX_ZONEORDER
 
 config MATH_EMULATION
         bool "Math emulation"
-        depends on 4xx || 8xx || E200 || E500
+        depends on 4xx || 8xx || E200 || PPC_83xx || E500
         ---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/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index 9d1614c3ce67..11bfbaf655b5 100644
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -833,7 +833,7 @@ static struct cpu_spec cpu_specs[] = {
                 .pvr_mask               = 0x7fff0000,
                 .pvr_value              = 0x00840000,
                 .cpu_name               = "e300c2",
-                .cpu_features           = CPU_FTRS_E300,
+                .cpu_features           = CPU_FTRS_E300C2,
                 .cpu_user_features      = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU,
                 .icache_bsize           = 32,
                 .dcache_bsize           = 32,
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index d88e182e40b3..9417cf5b4b7e 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -437,6 +437,13 @@ Alignment:
 /* Floating-point unavailable */
         . = 0x800
 FPUnavailable:
+BEGIN_FTR_SECTION
+/*
+ * Certain Freescale cores don't have a FPU and treat fp instructions
+ * as a FP Unavailable exception.  Redirect to illegal/emulation handling.
+ */
+        b       ProgramCheck
+END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
         EXCEPTION_PROLOG
         bne     load_up_fpu             /* if from user, just load it up */
         addi    r3,r1,STACK_FRAME_OVERHEAD
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 0d4e203fa7a0..fde820e52d03 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -782,6 +782,8 @@ void __kprobes program_check_exception(struct pt_regs *regs)
         unsigned int reason = get_reason(regs);
         extern int do_mathemu(struct pt_regs *regs);
 
+        /* We can now get here via a FP Unavailable exception if the core
+         * has no FPU, in that case no reason flags will be set */
 #ifdef CONFIG_MATH_EMULATION
         /* (reason & REASON_ILLEGAL) would be the obvious thing here,
          * but there seems to be a hardware bug on the 405GP (RevD)
diff --git a/include/asm-powerpc/cputable.h b/include/asm-powerpc/cputable.h
index 6fe5c9d4ca3b..aca72f90849e 100644
--- a/include/asm-powerpc/cputable.h
+++ b/include/asm-powerpc/cputable.h
@@ -126,6 +126,7 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start,
 #define CPU_FTR_NODSISRALIGN            ASM_CONST(0x0000000000100000)
 #define CPU_FTR_PPC_LE                  ASM_CONST(0x0000000000200000)
 #define CPU_FTR_REAL_LE                 ASM_CONST(0x0000000000400000)
+#define CPU_FTR_FPU_UNAVAILABLE         ASM_CONST(0x0000000000800000)
 
 /*
  * Add the 64-bit processor unique features in the top half of the word;
@@ -295,6 +296,9 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start,
 #define CPU_FTRS_E300   (CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_MAYBE_CAN_DOZE | \
             CPU_FTR_USE_TB | CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_HAS_HIGH_BATS | \
             CPU_FTR_COMMON)
+#define CPU_FTRS_E300C2 (CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_MAYBE_CAN_DOZE | \
+            CPU_FTR_USE_TB | CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_HAS_HIGH_BATS | \
+            CPU_FTR_COMMON | CPU_FTR_FPU_UNAVAILABLE)
 #define CPU_FTRS_CLASSIC32      (CPU_FTR_COMMON | CPU_FTR_SPLIT_ID_CACHE | \
             CPU_FTR_USE_TB | CPU_FTR_HPTE_TABLE)
 #define CPU_FTRS_8XX    (CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB)
@@ -364,7 +368,8 @@ enum {
             CPU_FTRS_7450_21 | CPU_FTRS_7450_23 | CPU_FTRS_7455_1 |
             CPU_FTRS_7455_20 | CPU_FTRS_7455 | CPU_FTRS_7447_10 |
             CPU_FTRS_7447 | CPU_FTRS_7447A | CPU_FTRS_82XX |
-            CPU_FTRS_G2_LE | CPU_FTRS_E300 | CPU_FTRS_CLASSIC32 |
+            CPU_FTRS_G2_LE | CPU_FTRS_E300 | CPU_FTRS_E300C2 |
+            CPU_FTRS_CLASSIC32 |
 #else
             CPU_FTRS_GENERIC_32 |
 #endif
@@ -403,7 +408,8 @@ enum {
             CPU_FTRS_7450_21 & CPU_FTRS_7450_23 & CPU_FTRS_7455_1 &
             CPU_FTRS_7455_20 & CPU_FTRS_7455 & CPU_FTRS_7447_10 &
             CPU_FTRS_7447 & CPU_FTRS_7447A & CPU_FTRS_82XX &
-            CPU_FTRS_G2_LE & CPU_FTRS_E300 & CPU_FTRS_CLASSIC32 &
+            CPU_FTRS_G2_LE & CPU_FTRS_E300 & CPU_FTRS_E300C2 &
+            CPU_FTRS_CLASSIC32 &
 #else
             CPU_FTRS_GENERIC_32 &
 #endif