2 files changed, 0 insertions, 143 deletions

diff --git a/arch/ppc64/lib/Makefile b/arch/ppc64/lib/Makefile
index 49af089c6049..e8ce831d8eae 100644
--- a/arch/ppc64/lib/Makefile
+++ b/arch/ppc64/lib/Makefile
@@ -4,5 +4,3 @@
 
 lib-y := string.o strcase.o
 lib-y += usercopy.o
-
-lib-$(CONFIG_DEBUG_KERNEL) += sstep.o
diff --git a/arch/ppc64/lib/sstep.c b/arch/ppc64/lib/sstep.c
deleted file mode 100644
index e79123d1485c..000000000000
--- a/arch/ppc64/lib/sstep.c
+++ /dev/null
@@ -1,141 +0,0 @@
-/*
- * Single-step support.
- *
- * Copyright (C) 2004 Paul Mackerras <paulus@au.ibm.com>, IBM
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-#include <linux/kernel.h>
-#include <linux/ptrace.h>
-#include <asm/sstep.h>
-#include <asm/processor.h>
-
-extern char system_call_common[];
-
-/* Bits in SRR1 that are copied from MSR */
-#define MSR_MASK        0xffffffff87c0ffff
-
-/*
- * Determine whether a conditional branch instruction would branch.
- */
-static int branch_taken(unsigned int instr, struct pt_regs *regs)
-{
-        unsigned int bo = (instr >> 21) & 0x1f;
-        unsigned int bi;
-
-        if ((bo & 4) == 0) {
-                /* decrement counter */
-                --regs->ctr;
-                if (((bo >> 1) & 1) ^ (regs->ctr == 0))
-                        return 0;
-        }
-        if ((bo & 0x10) == 0) {
-                /* check bit from CR */
-                bi = (instr >> 16) & 0x1f;
-                if (((regs->ccr >> (31 - bi)) & 1) != ((bo >> 3) & 1))
-                        return 0;
-        }
-        return 1;
-}
-
-/*
- * Emulate instructions that cause a transfer of control.
- * Returns 1 if the step was emulated, 0 if not,
- * or -1 if the instruction is one that should not be stepped,
- * such as an rfid, or a mtmsrd that would clear MSR_RI.
- */
-int emulate_step(struct pt_regs *regs, unsigned int instr)
-{
-        unsigned int opcode, rd;
-        unsigned long int imm;
-
-        opcode = instr >> 26;
-        switch (opcode) {
-        case 16:        /* bc */
-                imm = (signed short)(instr & 0xfffc);
-                if ((instr & 2) == 0)
-                        imm += regs->nip;
-                regs->nip += 4;
-                if ((regs->msr & MSR_SF) == 0)
-                        regs->nip &= 0xffffffffUL;
-                if (instr & 1)
-                        regs->link = regs->nip;
-                if (branch_taken(instr, regs))
-                        regs->nip = imm;
-                return 1;
-        case 17:        /* sc */
-                /*
-                 * N.B. this uses knowledge about how the syscall
-                 * entry code works.  If that is changed, this will
-                 * need to be changed also.
-                 */
-                regs->gpr[9] = regs->gpr[13];
-                regs->gpr[11] = regs->nip + 4;
-                regs->gpr[12] = regs->msr & MSR_MASK;
-                regs->gpr[13] = (unsigned long) get_paca();
-                regs->nip = (unsigned long) &system_call_common;
-                regs->msr = MSR_KERNEL;
-                return 1;
-        case 18:        /* b */
-                imm = instr & 0x03fffffc;
-                if (imm & 0x02000000)
-                        imm -= 0x04000000;
-                if ((instr & 2) == 0)
-                        imm += regs->nip;
-                if (instr & 1) {
-                        regs->link = regs->nip + 4;
-                        if ((regs->msr & MSR_SF) == 0)
-                                regs->link &= 0xffffffffUL;
-                }
-                if ((regs->msr & MSR_SF) == 0)
-                        imm &= 0xffffffffUL;
-                regs->nip = imm;
-                return 1;
-        case 19:
-                switch (instr & 0x7fe) {
-                case 0x20:      /* bclr */
-                case 0x420:     /* bcctr */
-                        imm = (instr & 0x400)? regs->ctr: regs->link;
-                        regs->nip += 4;
-                        if ((regs->msr & MSR_SF) == 0) {
-                                regs->nip &= 0xffffffffUL;
-                                imm &= 0xffffffffUL;
-                        }
-                        if (instr & 1)
-                                regs->link = regs->nip;
-                        if (branch_taken(instr, regs))
-                                regs->nip = imm;
-                        return 1;
-                case 0x24:      /* rfid, scary */
-                        return -1;
-                }
-        case 31:
-                rd = (instr >> 21) & 0x1f;
-                switch (instr & 0x7fe) {
-                case 0xa6:      /* mfmsr */
-                        regs->gpr[rd] = regs->msr & MSR_MASK;
-                        regs->nip += 4;
-                        if ((regs->msr & MSR_SF) == 0)
-                                regs->nip &= 0xffffffffUL;
-                        return 1;
-                case 0x164:     /* mtmsrd */
-                        /* only MSR_EE and MSR_RI get changed if bit 15 set */
-                        /* mtmsrd doesn't change MSR_HV and MSR_ME */
-                        imm = (instr & 0x10000)? 0x8002: 0xefffffffffffefffUL;
-                        imm = (regs->msr & MSR_MASK & ~imm)
-                                | (regs->gpr[rd] & imm);
-                        if ((imm & MSR_RI) == 0)
-                                /* can't step mtmsrd that would clear MSR_RI */
-                                return -1;
-                        regs->msr = imm;
-                        regs->nip += 4;
-                        if ((imm & MSR_SF) == 0)
-                                regs->nip &= 0xffffffffUL;
-                        return 1;
-                }
-        }
-        return 0;
-}