7 files changed, 37 insertions, 37 deletions

diff --git a/arch/mips/include/asm/break.h b/arch/mips/include/asm/break.h
index 25b980c91e7e..44437ed765e8 100644
--- a/arch/mips/include/asm/break.h
+++ b/arch/mips/include/asm/break.h
@@ -29,6 +29,7 @@
 #define _BRK_THREADBP   11      /* For threads, user bp (used by debuggers) */
 #define BRK_BUG         512     /* Used by BUG() */
 #define BRK_KDB         513     /* Used in KDB_ENTER() */
+#define BRK_MEMU        514     /* Used by FPU emulator */
 #define BRK_MULOVF      1023    /* Multiply overflow */
 
 #endif /* __ASM_BREAK_H */
diff --git a/arch/mips/include/asm/fpu_emulator.h b/arch/mips/include/asm/fpu_emulator.h
index 2731c38bd7ae..e5189572956c 100644
--- a/arch/mips/include/asm/fpu_emulator.h
+++ b/arch/mips/include/asm/fpu_emulator.h
@@ -23,6 +23,9 @@
 #ifndef _ASM_FPU_EMULATOR_H
 #define _ASM_FPU_EMULATOR_H
 
+#include <asm/break.h>
+#include <asm/inst.h>
+
 struct mips_fpu_emulator_stats {
         unsigned int emulated;
         unsigned int loads;
@@ -34,4 +37,18 @@ struct mips_fpu_emulator_stats {
 
 extern struct mips_fpu_emulator_stats fpuemustats;
 
+extern int mips_dsemul(struct pt_regs *regs, mips_instruction ir,
+        unsigned long cpc);
+extern int do_dsemulret(struct pt_regs *xcp);
+
+/*
+ * Instruction inserted following the badinst to further tag the sequence
+ */
+#define BD_COOKIE 0x0000bd36    /* tne $0, $0 with baggage */
+
+/*
+ * Break instruction with special math emu break code set
+ */
+#define BREAK_MATH (0x0000000d | (BRK_MEMU << 16))
+
 #endif /* _ASM_FPU_EMULATOR_H */
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 3f6de76d485d..353056110f2b 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -32,6 +32,7 @@
 #include <asm/cpu.h>
 #include <asm/dsp.h>
 #include <asm/fpu.h>
+#include <asm/fpu_emulator.h>
 #include <asm/mipsregs.h>
 #include <asm/mipsmtregs.h>
 #include <asm/module.h>
@@ -722,6 +723,21 @@ static void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
                 die_if_kernel("Kernel bug detected", regs);
                 force_sig(SIGTRAP, current);
                 break;
+        case BRK_MEMU:
+                /*
+                 * Address errors may be deliberately induced by the FPU
+                 * emulator to retake control of the CPU after executing the
+                 * instruction in the delay slot of an emulated branch.
+                 *
+                 * Terminate if exception was recognized as a delay slot return
+                 * otherwise handle as normal.
+                 */
+                if (do_dsemulret(regs))
+                        return;
+
+                die_if_kernel("Math emu break/trap", regs);
+                force_sig(SIGTRAP, current);
+                break;
         default:
                 scnprintf(b, sizeof(b), "%s instruction in kernel code", str);
                 die_if_kernel(b, regs);
diff --git a/arch/mips/kernel/unaligned.c b/arch/mips/kernel/unaligned.c
index 20709669e592..bf4c4a979abb 100644
--- a/arch/mips/kernel/unaligned.c
+++ b/arch/mips/kernel/unaligned.c
@@ -499,22 +499,10 @@ sigill:
 
 asmlinkage void do_ade(struct pt_regs *regs)
 {
-        extern int do_dsemulret(struct pt_regs *);
         unsigned int __user *pc;
         mm_segment_t seg;
 
         /*
-         * Address errors may be deliberately induced by the FPU emulator to
-         * retake control of the CPU after executing the instruction in the
-         * delay slot of an emulated branch.
-         */
-        /* Terminate if exception was recognized as a delay slot return */
-        if (do_dsemulret(regs))
-                return;
-
-        /* Otherwise handle as normal */
-
-        /*
          * Did we catch a fault trying to load an instruction?
          * Or are we running in MIPS16 mode?
          */
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 7ec0b217dfd3..890f77927d62 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -48,7 +48,6 @@
 #include <asm/branch.h>
 
 #include "ieee754.h"
-#include "dsemul.h"
 
 /* Strap kernel emulator for full MIPS IV emulation */
 
@@ -346,9 +345,6 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx)
                         /* cop control register rd -> gpr[rt] */
                         u32 value;
 
-                        if (ir == CP1UNDEF) {
-                                return do_dsemulret(xcp);
-                        }
                         if (MIPSInst_RD(ir) == FPCREG_CSR) {
                                 value = ctx->fcr31;
                                 value = (value & ~0x3) | mips_rm[value & 0x3];
diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c
index 653e325849e4..df7b9d928efc 100644
--- a/arch/mips/math-emu/dsemul.c
+++ b/arch/mips/math-emu/dsemul.c
@@ -18,7 +18,6 @@
 #include <asm/fpu_emulator.h>
 
 #include "ieee754.h"
-#include "dsemul.h"
 
 /* Strap kernel emulator for full MIPS IV emulation */
 
@@ -94,7 +93,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
                 return SIGBUS;
 
         err = __put_user(ir, &fr->emul);
-        err |= __put_user((mips_instruction)BADINST, &fr->badinst);
+        err |= __put_user((mips_instruction)BREAK_MATH, &fr->badinst);
         err |= __put_user((mips_instruction)BD_COOKIE, &fr->cookie);
         err |= __put_user(cpc, &fr->epc);
 
@@ -130,13 +129,13 @@ int do_dsemulret(struct pt_regs *xcp)
         /*
          * Do some sanity checking on the stackframe:
          *
-         *  - Is the instruction pointed to by the EPC an BADINST?
+         *  - Is the instruction pointed to by the EPC an BREAK_MATH?
          *  - Is the following memory word the BD_COOKIE?
          */
         err = __get_user(insn, &fr->badinst);
         err |= __get_user(cookie, &fr->cookie);
 
-        if (unlikely(err || (insn != BADINST) || (cookie != BD_COOKIE))) {
+        if (unlikely(err || (insn != BREAK_MATH) || (cookie != BD_COOKIE))) {
                 fpuemustats.errors++;
                 return 0;
         }
diff --git a/arch/mips/math-emu/dsemul.h b/arch/mips/math-emu/dsemul.h
deleted file mode 100644
index 091f0e76730f..000000000000
--- a/arch/mips/math-emu/dsemul.h
+++ /dev/null
@@ -1,17 +0,0 @@
-extern int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc);
-extern int do_dsemulret(struct pt_regs *xcp);
-
-/* Instruction which will always cause an address error */
-#define AdELOAD 0x8c000001      /* lw $0,1($0) */
-/* Instruction which will plainly cause a CP1 exception when FPU is disabled */
-#define CP1UNDEF 0x44400001    /* cfc1 $0,$0 undef  */
-
-/* Instruction inserted following the badinst to further tag the sequence */
-#define BD_COOKIE 0x0000bd36 /* tne $0,$0 with baggage */
-
-/* Setup which instruction to use for trampoline */
-#ifdef STANDALONE_EMULATOR
-#define BADINST CP1UNDEF
-#else
-#define BADINST AdELOAD
-#endif