ppc64: use sstep.c from powerpc/lib
Stephen Rothwell [Thu, 27 Oct 2005 07:05:27 +0000 (17:05 +1000)]
since it is identical to sstep.c from ppc64/lib.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

arch/powerpc/lib/Makefile
arch/ppc64/lib/Makefile
arch/ppc64/lib/sstep.c [deleted file]

index 9cf35ed..a7af96c 100644 (file)
@@ -5,7 +5,7 @@
 ifeq ($(CONFIG_PPC_MERGE),y)
 obj-y                  := strcase.o string.o
 obj-$(CONFIG_PPC32)    += div64.o copy_32.o checksum_32.o
-obj-$(CONFIG_PPC64)    += usercopy_64.o sstep.o mem_64.o
+obj-$(CONFIG_PPC64)    += usercopy_64.o mem_64.o
 endif
 
 obj-$(CONFIG_PPC64)    += checksum_64.o copypage_64.o copyuser_64.o \
@@ -13,4 +13,5 @@ obj-$(CONFIG_PPC64)   += checksum_64.o copypage_64.o copyuser_64.o \
 obj-$(CONFIG_PPC_ISERIES) += e2a.o
 ifeq ($(CONFIG_PPC64),y)
 obj-$(CONFIG_SMP)      += locks.o
+obj-$(CONFIG_DEBUG_KERNEL) += sstep.o
 endif
index 49af089..e8ce831 100644 (file)
@@ -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 (file)
index e79123d..0000000
+++ /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;
-}