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-rw-r--r--arch/powerpc/lib/sstep.c2015
1 files changed, 2015 insertions, 0 deletions
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
new file mode 100644
index 000000000..dc885b30f
--- /dev/null
+++ b/arch/powerpc/lib/sstep.c
@@ -0,0 +1,2015 @@
+/*
+ * 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/kprobes.h>
+#include <linux/ptrace.h>
+#include <linux/prefetch.h>
+#include <asm/sstep.h>
+#include <asm/processor.h>
+#include <asm/uaccess.h>
+#include <asm/cputable.h>
+
+extern char system_call_common[];
+
+#ifdef CONFIG_PPC64
+/* Bits in SRR1 that are copied from MSR */
+#define MSR_MASK 0xffffffff87c0ffffUL
+#else
+#define MSR_MASK 0x87c0ffff
+#endif
+
+/* Bits in XER */
+#define XER_SO 0x80000000U
+#define XER_OV 0x40000000U
+#define XER_CA 0x20000000U
+
+#ifdef CONFIG_PPC_FPU
+/*
+ * Functions in ldstfp.S
+ */
+extern int do_lfs(int rn, unsigned long ea);
+extern int do_lfd(int rn, unsigned long ea);
+extern int do_stfs(int rn, unsigned long ea);
+extern int do_stfd(int rn, unsigned long ea);
+extern int do_lvx(int rn, unsigned long ea);
+extern int do_stvx(int rn, unsigned long ea);
+extern int do_lxvd2x(int rn, unsigned long ea);
+extern int do_stxvd2x(int rn, unsigned long ea);
+#endif
+
+/*
+ * Emulate the truncation of 64 bit values in 32-bit mode.
+ */
+static unsigned long truncate_if_32bit(unsigned long msr, unsigned long val)
+{
+#ifdef __powerpc64__
+ if ((msr & MSR_64BIT) == 0)
+ val &= 0xffffffffUL;
+#endif
+ return val;
+}
+
+/*
+ * Determine whether a conditional branch instruction would branch.
+ */
+static int __kprobes 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;
+}
+
+
+static long __kprobes address_ok(struct pt_regs *regs, unsigned long ea, int nb)
+{
+ if (!user_mode(regs))
+ return 1;
+ return __access_ok(ea, nb, USER_DS);
+}
+
+/*
+ * Calculate effective address for a D-form instruction
+ */
+static unsigned long __kprobes dform_ea(unsigned int instr, struct pt_regs *regs)
+{
+ int ra;
+ unsigned long ea;
+
+ ra = (instr >> 16) & 0x1f;
+ ea = (signed short) instr; /* sign-extend */
+ if (ra)
+ ea += regs->gpr[ra];
+
+ return truncate_if_32bit(regs->msr, ea);
+}
+
+#ifdef __powerpc64__
+/*
+ * Calculate effective address for a DS-form instruction
+ */
+static unsigned long __kprobes dsform_ea(unsigned int instr, struct pt_regs *regs)
+{
+ int ra;
+ unsigned long ea;
+
+ ra = (instr >> 16) & 0x1f;
+ ea = (signed short) (instr & ~3); /* sign-extend */
+ if (ra)
+ ea += regs->gpr[ra];
+
+ return truncate_if_32bit(regs->msr, ea);
+}
+#endif /* __powerpc64 */
+
+/*
+ * Calculate effective address for an X-form instruction
+ */
+static unsigned long __kprobes xform_ea(unsigned int instr,
+ struct pt_regs *regs)
+{
+ int ra, rb;
+ unsigned long ea;
+
+ ra = (instr >> 16) & 0x1f;
+ rb = (instr >> 11) & 0x1f;
+ ea = regs->gpr[rb];
+ if (ra)
+ ea += regs->gpr[ra];
+
+ return truncate_if_32bit(regs->msr, ea);
+}
+
+/*
+ * Return the largest power of 2, not greater than sizeof(unsigned long),
+ * such that x is a multiple of it.
+ */
+static inline unsigned long max_align(unsigned long x)
+{
+ x |= sizeof(unsigned long);
+ return x & -x; /* isolates rightmost bit */
+}
+
+
+static inline unsigned long byterev_2(unsigned long x)
+{
+ return ((x >> 8) & 0xff) | ((x & 0xff) << 8);
+}
+
+static inline unsigned long byterev_4(unsigned long x)
+{
+ return ((x >> 24) & 0xff) | ((x >> 8) & 0xff00) |
+ ((x & 0xff00) << 8) | ((x & 0xff) << 24);
+}
+
+#ifdef __powerpc64__
+static inline unsigned long byterev_8(unsigned long x)
+{
+ return (byterev_4(x) << 32) | byterev_4(x >> 32);
+}
+#endif
+
+static int __kprobes read_mem_aligned(unsigned long *dest, unsigned long ea,
+ int nb)
+{
+ int err = 0;
+ unsigned long x = 0;
+
+ switch (nb) {
+ case 1:
+ err = __get_user(x, (unsigned char __user *) ea);
+ break;
+ case 2:
+ err = __get_user(x, (unsigned short __user *) ea);
+ break;
+ case 4:
+ err = __get_user(x, (unsigned int __user *) ea);
+ break;
+#ifdef __powerpc64__
+ case 8:
+ err = __get_user(x, (unsigned long __user *) ea);
+ break;
+#endif
+ }
+ if (!err)
+ *dest = x;
+ return err;
+}
+
+static int __kprobes read_mem_unaligned(unsigned long *dest, unsigned long ea,
+ int nb, struct pt_regs *regs)
+{
+ int err;
+ unsigned long x, b, c;
+#ifdef __LITTLE_ENDIAN__
+ int len = nb; /* save a copy of the length for byte reversal */
+#endif
+
+ /* unaligned, do this in pieces */
+ x = 0;
+ for (; nb > 0; nb -= c) {
+#ifdef __LITTLE_ENDIAN__
+ c = 1;
+#endif
+#ifdef __BIG_ENDIAN__
+ c = max_align(ea);
+#endif
+ if (c > nb)
+ c = max_align(nb);
+ err = read_mem_aligned(&b, ea, c);
+ if (err)
+ return err;
+ x = (x << (8 * c)) + b;
+ ea += c;
+ }
+#ifdef __LITTLE_ENDIAN__
+ switch (len) {
+ case 2:
+ *dest = byterev_2(x);
+ break;
+ case 4:
+ *dest = byterev_4(x);
+ break;
+#ifdef __powerpc64__
+ case 8:
+ *dest = byterev_8(x);
+ break;
+#endif
+ }
+#endif
+#ifdef __BIG_ENDIAN__
+ *dest = x;
+#endif
+ return 0;
+}
+
+/*
+ * Read memory at address ea for nb bytes, return 0 for success
+ * or -EFAULT if an error occurred.
+ */
+static int __kprobes read_mem(unsigned long *dest, unsigned long ea, int nb,
+ struct pt_regs *regs)
+{
+ if (!address_ok(regs, ea, nb))
+ return -EFAULT;
+ if ((ea & (nb - 1)) == 0)
+ return read_mem_aligned(dest, ea, nb);
+ return read_mem_unaligned(dest, ea, nb, regs);
+}
+
+static int __kprobes write_mem_aligned(unsigned long val, unsigned long ea,
+ int nb)
+{
+ int err = 0;
+
+ switch (nb) {
+ case 1:
+ err = __put_user(val, (unsigned char __user *) ea);
+ break;
+ case 2:
+ err = __put_user(val, (unsigned short __user *) ea);
+ break;
+ case 4:
+ err = __put_user(val, (unsigned int __user *) ea);
+ break;
+#ifdef __powerpc64__
+ case 8:
+ err = __put_user(val, (unsigned long __user *) ea);
+ break;
+#endif
+ }
+ return err;
+}
+
+static int __kprobes write_mem_unaligned(unsigned long val, unsigned long ea,
+ int nb, struct pt_regs *regs)
+{
+ int err;
+ unsigned long c;
+
+#ifdef __LITTLE_ENDIAN__
+ switch (nb) {
+ case 2:
+ val = byterev_2(val);
+ break;
+ case 4:
+ val = byterev_4(val);
+ break;
+#ifdef __powerpc64__
+ case 8:
+ val = byterev_8(val);
+ break;
+#endif
+ }
+#endif
+ /* unaligned or little-endian, do this in pieces */
+ for (; nb > 0; nb -= c) {
+#ifdef __LITTLE_ENDIAN__
+ c = 1;
+#endif
+#ifdef __BIG_ENDIAN__
+ c = max_align(ea);
+#endif
+ if (c > nb)
+ c = max_align(nb);
+ err = write_mem_aligned(val >> (nb - c) * 8, ea, c);
+ if (err)
+ return err;
+ ea += c;
+ }
+ return 0;
+}
+
+/*
+ * Write memory at address ea for nb bytes, return 0 for success
+ * or -EFAULT if an error occurred.
+ */
+static int __kprobes write_mem(unsigned long val, unsigned long ea, int nb,
+ struct pt_regs *regs)
+{
+ if (!address_ok(regs, ea, nb))
+ return -EFAULT;
+ if ((ea & (nb - 1)) == 0)
+ return write_mem_aligned(val, ea, nb);
+ return write_mem_unaligned(val, ea, nb, regs);
+}
+
+#ifdef CONFIG_PPC_FPU
+/*
+ * Check the address and alignment, and call func to do the actual
+ * load or store.
+ */
+static int __kprobes do_fp_load(int rn, int (*func)(int, unsigned long),
+ unsigned long ea, int nb,
+ struct pt_regs *regs)
+{
+ int err;
+ union {
+ double dbl;
+ unsigned long ul[2];
+ struct {
+#ifdef __BIG_ENDIAN__
+ unsigned _pad_;
+ unsigned word;
+#endif
+#ifdef __LITTLE_ENDIAN__
+ unsigned word;
+ unsigned _pad_;
+#endif
+ } single;
+ } data;
+ unsigned long ptr;
+
+ if (!address_ok(regs, ea, nb))
+ return -EFAULT;
+ if ((ea & 3) == 0)
+ return (*func)(rn, ea);
+ ptr = (unsigned long) &data.ul;
+ if (sizeof(unsigned long) == 8 || nb == 4) {
+ err = read_mem_unaligned(&data.ul[0], ea, nb, regs);
+ if (nb == 4)
+ ptr = (unsigned long)&(data.single.word);
+ } else {
+ /* reading a double on 32-bit */
+ err = read_mem_unaligned(&data.ul[0], ea, 4, regs);
+ if (!err)
+ err = read_mem_unaligned(&data.ul[1], ea + 4, 4, regs);
+ }
+ if (err)
+ return err;
+ return (*func)(rn, ptr);
+}
+
+static int __kprobes do_fp_store(int rn, int (*func)(int, unsigned long),
+ unsigned long ea, int nb,
+ struct pt_regs *regs)
+{
+ int err;
+ union {
+ double dbl;
+ unsigned long ul[2];
+ struct {
+#ifdef __BIG_ENDIAN__
+ unsigned _pad_;
+ unsigned word;
+#endif
+#ifdef __LITTLE_ENDIAN__
+ unsigned word;
+ unsigned _pad_;
+#endif
+ } single;
+ } data;
+ unsigned long ptr;
+
+ if (!address_ok(regs, ea, nb))
+ return -EFAULT;
+ if ((ea & 3) == 0)
+ return (*func)(rn, ea);
+ ptr = (unsigned long) &data.ul[0];
+ if (sizeof(unsigned long) == 8 || nb == 4) {
+ if (nb == 4)
+ ptr = (unsigned long)&(data.single.word);
+ err = (*func)(rn, ptr);
+ if (err)
+ return err;
+ err = write_mem_unaligned(data.ul[0], ea, nb, regs);
+ } else {
+ /* writing a double on 32-bit */
+ err = (*func)(rn, ptr);
+ if (err)
+ return err;
+ err = write_mem_unaligned(data.ul[0], ea, 4, regs);
+ if (!err)
+ err = write_mem_unaligned(data.ul[1], ea + 4, 4, regs);
+ }
+ return err;
+}
+#endif
+
+#ifdef CONFIG_ALTIVEC
+/* For Altivec/VMX, no need to worry about alignment */
+static int __kprobes do_vec_load(int rn, int (*func)(int, unsigned long),
+ unsigned long ea, struct pt_regs *regs)
+{
+ if (!address_ok(regs, ea & ~0xfUL, 16))
+ return -EFAULT;
+ return (*func)(rn, ea);
+}
+
+static int __kprobes do_vec_store(int rn, int (*func)(int, unsigned long),
+ unsigned long ea, struct pt_regs *regs)
+{
+ if (!address_ok(regs, ea & ~0xfUL, 16))
+ return -EFAULT;
+ return (*func)(rn, ea);
+}
+#endif /* CONFIG_ALTIVEC */
+
+#ifdef CONFIG_VSX
+static int __kprobes do_vsx_load(int rn, int (*func)(int, unsigned long),
+ unsigned long ea, struct pt_regs *regs)
+{
+ int err;
+ unsigned long val[2];
+
+ if (!address_ok(regs, ea, 16))
+ return -EFAULT;
+ if ((ea & 3) == 0)
+ return (*func)(rn, ea);
+ err = read_mem_unaligned(&val[0], ea, 8, regs);
+ if (!err)
+ err = read_mem_unaligned(&val[1], ea + 8, 8, regs);
+ if (!err)
+ err = (*func)(rn, (unsigned long) &val[0]);
+ return err;
+}
+
+static int __kprobes do_vsx_store(int rn, int (*func)(int, unsigned long),
+ unsigned long ea, struct pt_regs *regs)
+{
+ int err;
+ unsigned long val[2];
+
+ if (!address_ok(regs, ea, 16))
+ return -EFAULT;
+ if ((ea & 3) == 0)
+ return (*func)(rn, ea);
+ err = (*func)(rn, (unsigned long) &val[0]);
+ if (err)
+ return err;
+ err = write_mem_unaligned(val[0], ea, 8, regs);
+ if (!err)
+ err = write_mem_unaligned(val[1], ea + 8, 8, regs);
+ return err;
+}
+#endif /* CONFIG_VSX */
+
+#define __put_user_asmx(x, addr, err, op, cr) \
+ __asm__ __volatile__( \
+ "1: " op " %2,0,%3\n" \
+ " mfcr %1\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: li %0,%4\n" \
+ " b 2b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ PPC_LONG_ALIGN "\n" \
+ PPC_LONG "1b,3b\n" \
+ ".previous" \
+ : "=r" (err), "=r" (cr) \
+ : "r" (x), "r" (addr), "i" (-EFAULT), "0" (err))
+
+#define __get_user_asmx(x, addr, err, op) \
+ __asm__ __volatile__( \
+ "1: "op" %1,0,%2\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: li %0,%3\n" \
+ " b 2b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ PPC_LONG_ALIGN "\n" \
+ PPC_LONG "1b,3b\n" \
+ ".previous" \
+ : "=r" (err), "=r" (x) \
+ : "r" (addr), "i" (-EFAULT), "0" (err))
+
+#define __cacheop_user_asmx(addr, err, op) \
+ __asm__ __volatile__( \
+ "1: "op" 0,%1\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: li %0,%3\n" \
+ " b 2b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ PPC_LONG_ALIGN "\n" \
+ PPC_LONG "1b,3b\n" \
+ ".previous" \
+ : "=r" (err) \
+ : "r" (addr), "i" (-EFAULT), "0" (err))
+
+static void __kprobes set_cr0(struct pt_regs *regs, int rd)
+{
+ long val = regs->gpr[rd];
+
+ regs->ccr = (regs->ccr & 0x0fffffff) | ((regs->xer >> 3) & 0x10000000);
+#ifdef __powerpc64__
+ if (!(regs->msr & MSR_64BIT))
+ val = (int) val;
+#endif
+ if (val < 0)
+ regs->ccr |= 0x80000000;
+ else if (val > 0)
+ regs->ccr |= 0x40000000;
+ else
+ regs->ccr |= 0x20000000;
+}
+
+static void __kprobes add_with_carry(struct pt_regs *regs, int rd,
+ unsigned long val1, unsigned long val2,
+ unsigned long carry_in)
+{
+ unsigned long val = val1 + val2;
+
+ if (carry_in)
+ ++val;
+ regs->gpr[rd] = val;
+#ifdef __powerpc64__
+ if (!(regs->msr & MSR_64BIT)) {
+ val = (unsigned int) val;
+ val1 = (unsigned int) val1;
+ }
+#endif
+ if (val < val1 || (carry_in && val == val1))
+ regs->xer |= XER_CA;
+ else
+ regs->xer &= ~XER_CA;
+}
+
+static void __kprobes do_cmp_signed(struct pt_regs *regs, long v1, long v2,
+ int crfld)
+{
+ unsigned int crval, shift;
+
+ crval = (regs->xer >> 31) & 1; /* get SO bit */
+ if (v1 < v2)
+ crval |= 8;
+ else if (v1 > v2)
+ crval |= 4;
+ else
+ crval |= 2;
+ shift = (7 - crfld) * 4;
+ regs->ccr = (regs->ccr & ~(0xf << shift)) | (crval << shift);
+}
+
+static void __kprobes do_cmp_unsigned(struct pt_regs *regs, unsigned long v1,
+ unsigned long v2, int crfld)
+{
+ unsigned int crval, shift;
+
+ crval = (regs->xer >> 31) & 1; /* get SO bit */
+ if (v1 < v2)
+ crval |= 8;
+ else if (v1 > v2)
+ crval |= 4;
+ else
+ crval |= 2;
+ shift = (7 - crfld) * 4;
+ regs->ccr = (regs->ccr & ~(0xf << shift)) | (crval << shift);
+}
+
+static int __kprobes trap_compare(long v1, long v2)
+{
+ int ret = 0;
+
+ if (v1 < v2)
+ ret |= 0x10;
+ else if (v1 > v2)
+ ret |= 0x08;
+ else
+ ret |= 0x04;
+ if ((unsigned long)v1 < (unsigned long)v2)
+ ret |= 0x02;
+ else if ((unsigned long)v1 > (unsigned long)v2)
+ ret |= 0x01;
+ return ret;
+}
+
+/*
+ * Elements of 32-bit rotate and mask instructions.
+ */
+#define MASK32(mb, me) ((0xffffffffUL >> (mb)) + \
+ ((signed long)-0x80000000L >> (me)) + ((me) >= (mb)))
+#ifdef __powerpc64__
+#define MASK64_L(mb) (~0UL >> (mb))
+#define MASK64_R(me) ((signed long)-0x8000000000000000L >> (me))
+#define MASK64(mb, me) (MASK64_L(mb) + MASK64_R(me) + ((me) >= (mb)))
+#define DATA32(x) (((x) & 0xffffffffUL) | (((x) & 0xffffffffUL) << 32))
+#else
+#define DATA32(x) (x)
+#endif
+#define ROTATE(x, n) ((n) ? (((x) << (n)) | ((x) >> (8 * sizeof(long) - (n)))) : (x))
+
+/*
+ * Decode an instruction, and execute it if that can be done just by
+ * modifying *regs (i.e. integer arithmetic and logical instructions,
+ * branches, and barrier instructions).
+ * Returns 1 if the instruction has been executed, or 0 if not.
+ * Sets *op to indicate what the instruction does.
+ */
+int __kprobes analyse_instr(struct instruction_op *op, struct pt_regs *regs,
+ unsigned int instr)
+{
+ unsigned int opcode, ra, rb, rd, spr, u;
+ unsigned long int imm;
+ unsigned long int val, val2;
+ unsigned int mb, me, sh;
+ long ival;
+
+ op->type = COMPUTE;
+
+ opcode = instr >> 26;
+ switch (opcode) {
+ case 16: /* bc */
+ op->type = BRANCH;
+ imm = (signed short)(instr & 0xfffc);
+ if ((instr & 2) == 0)
+ imm += regs->nip;
+ regs->nip += 4;
+ regs->nip = truncate_if_32bit(regs->msr, regs->nip);
+ if (instr & 1)
+ regs->link = regs->nip;
+ if (branch_taken(instr, regs))
+ regs->nip = truncate_if_32bit(regs->msr, imm);
+ return 1;
+#ifdef CONFIG_PPC64
+ case 17: /* sc */
+ if ((instr & 0xfe2) == 2)
+ op->type = SYSCALL;
+ else
+ op->type = UNKNOWN;
+ return 0;
+#endif
+ case 18: /* b */
+ op->type = BRANCH;
+ imm = instr & 0x03fffffc;
+ if (imm & 0x02000000)
+ imm -= 0x04000000;
+ if ((instr & 2) == 0)
+ imm += regs->nip;
+ if (instr & 1)
+ regs->link = truncate_if_32bit(regs->msr, regs->nip + 4);
+ imm = truncate_if_32bit(regs->msr, imm);
+ regs->nip = imm;
+ return 1;
+ case 19:
+ switch ((instr >> 1) & 0x3ff) {
+ case 0: /* mcrf */
+ rd = (instr >> 21) & 0x1c;
+ ra = (instr >> 16) & 0x1c;
+ val = (regs->ccr >> ra) & 0xf;
+ regs->ccr = (regs->ccr & ~(0xfUL << rd)) | (val << rd);
+ goto instr_done;
+
+ case 16: /* bclr */
+ case 528: /* bcctr */
+ op->type = BRANCH;
+ imm = (instr & 0x400)? regs->ctr: regs->link;
+ regs->nip = truncate_if_32bit(regs->msr, regs->nip + 4);
+ imm = truncate_if_32bit(regs->msr, imm);
+ if (instr & 1)
+ regs->link = regs->nip;
+ if (branch_taken(instr, regs))
+ regs->nip = imm;
+ return 1;
+
+ case 18: /* rfid, scary */
+ if (regs->msr & MSR_PR)
+ goto priv;
+ op->type = RFI;
+ return 0;
+
+ case 150: /* isync */
+ op->type = BARRIER;
+ isync();
+ goto instr_done;
+
+ case 33: /* crnor */
+ case 129: /* crandc */
+ case 193: /* crxor */
+ case 225: /* crnand */
+ case 257: /* crand */
+ case 289: /* creqv */
+ case 417: /* crorc */
+ case 449: /* cror */
+ ra = (instr >> 16) & 0x1f;
+ rb = (instr >> 11) & 0x1f;
+ rd = (instr >> 21) & 0x1f;
+ ra = (regs->ccr >> (31 - ra)) & 1;
+ rb = (regs->ccr >> (31 - rb)) & 1;
+ val = (instr >> (6 + ra * 2 + rb)) & 1;
+ regs->ccr = (regs->ccr & ~(1UL << (31 - rd))) |
+ (val << (31 - rd));
+ goto instr_done;
+ }
+ break;
+ case 31:
+ switch ((instr >> 1) & 0x3ff) {
+ case 598: /* sync */
+ op->type = BARRIER;
+#ifdef __powerpc64__
+ switch ((instr >> 21) & 3) {
+ case 1: /* lwsync */
+ asm volatile("lwsync" : : : "memory");
+ goto instr_done;
+ case 2: /* ptesync */
+ asm volatile("ptesync" : : : "memory");
+ goto instr_done;
+ }
+#endif
+ mb();
+ goto instr_done;
+
+ case 854: /* eieio */
+ op->type = BARRIER;
+ eieio();
+ goto instr_done;
+ }
+ break;
+ }
+
+ /* Following cases refer to regs->gpr[], so we need all regs */
+ if (!FULL_REGS(regs))
+ return 0;
+
+ rd = (instr >> 21) & 0x1f;
+ ra = (instr >> 16) & 0x1f;
+ rb = (instr >> 11) & 0x1f;
+
+ switch (opcode) {
+#ifdef __powerpc64__
+ case 2: /* tdi */
+ if (rd & trap_compare(regs->gpr[ra], (short) instr))
+ goto trap;
+ goto instr_done;
+#endif
+ case 3: /* twi */
+ if (rd & trap_compare((int)regs->gpr[ra], (short) instr))
+ goto trap;
+ goto instr_done;
+
+ case 7: /* mulli */
+ regs->gpr[rd] = regs->gpr[ra] * (short) instr;
+ goto instr_done;
+
+ case 8: /* subfic */
+ imm = (short) instr;
+ add_with_carry(regs, rd, ~regs->gpr[ra], imm, 1);
+ goto instr_done;
+
+ case 10: /* cmpli */
+ imm = (unsigned short) instr;
+ val = regs->gpr[ra];
+#ifdef __powerpc64__
+ if ((rd & 1) == 0)
+ val = (unsigned int) val;
+#endif
+ do_cmp_unsigned(regs, val, imm, rd >> 2);
+ goto instr_done;
+
+ case 11: /* cmpi */
+ imm = (short) instr;
+ val = regs->gpr[ra];
+#ifdef __powerpc64__
+ if ((rd & 1) == 0)
+ val = (int) val;
+#endif
+ do_cmp_signed(regs, val, imm, rd >> 2);
+ goto instr_done;
+
+ case 12: /* addic */
+ imm = (short) instr;
+ add_with_carry(regs, rd, regs->gpr[ra], imm, 0);
+ goto instr_done;
+
+ case 13: /* addic. */
+ imm = (short) instr;
+ add_with_carry(regs, rd, regs->gpr[ra], imm, 0);
+ set_cr0(regs, rd);
+ goto instr_done;
+
+ case 14: /* addi */
+ imm = (short) instr;
+ if (ra)
+ imm += regs->gpr[ra];
+ regs->gpr[rd] = imm;
+ goto instr_done;
+
+ case 15: /* addis */
+ imm = ((short) instr) << 16;
+ if (ra)
+ imm += regs->gpr[ra];
+ regs->gpr[rd] = imm;
+ goto instr_done;
+
+ case 20: /* rlwimi */
+ mb = (instr >> 6) & 0x1f;
+ me = (instr >> 1) & 0x1f;
+ val = DATA32(regs->gpr[rd]);
+ imm = MASK32(mb, me);
+ regs->gpr[ra] = (regs->gpr[ra] & ~imm) | (ROTATE(val, rb) & imm);
+ goto logical_done;
+
+ case 21: /* rlwinm */
+ mb = (instr >> 6) & 0x1f;
+ me = (instr >> 1) & 0x1f;
+ val = DATA32(regs->gpr[rd]);
+ regs->gpr[ra] = ROTATE(val, rb) & MASK32(mb, me);
+ goto logical_done;
+
+ case 23: /* rlwnm */
+ mb = (instr >> 6) & 0x1f;
+ me = (instr >> 1) & 0x1f;
+ rb = regs->gpr[rb] & 0x1f;
+ val = DATA32(regs->gpr[rd]);
+ regs->gpr[ra] = ROTATE(val, rb) & MASK32(mb, me);
+ goto logical_done;
+
+ case 24: /* ori */
+ imm = (unsigned short) instr;
+ regs->gpr[ra] = regs->gpr[rd] | imm;
+ goto instr_done;
+
+ case 25: /* oris */
+ imm = (unsigned short) instr;
+ regs->gpr[ra] = regs->gpr[rd] | (imm << 16);
+ goto instr_done;
+
+ case 26: /* xori */
+ imm = (unsigned short) instr;
+ regs->gpr[ra] = regs->gpr[rd] ^ imm;
+ goto instr_done;
+
+ case 27: /* xoris */
+ imm = (unsigned short) instr;
+ regs->gpr[ra] = regs->gpr[rd] ^ (imm << 16);
+ goto instr_done;
+
+ case 28: /* andi. */
+ imm = (unsigned short) instr;
+ regs->gpr[ra] = regs->gpr[rd] & imm;
+ set_cr0(regs, ra);
+ goto instr_done;
+
+ case 29: /* andis. */
+ imm = (unsigned short) instr;
+ regs->gpr[ra] = regs->gpr[rd] & (imm << 16);
+ set_cr0(regs, ra);
+ goto instr_done;
+
+#ifdef __powerpc64__
+ case 30: /* rld* */
+ mb = ((instr >> 6) & 0x1f) | (instr & 0x20);
+ val = regs->gpr[rd];
+ if ((instr & 0x10) == 0) {
+ sh = rb | ((instr & 2) << 4);
+ val = ROTATE(val, sh);
+ switch ((instr >> 2) & 3) {
+ case 0: /* rldicl */
+ regs->gpr[ra] = val & MASK64_L(mb);
+ goto logical_done;
+ case 1: /* rldicr */
+ regs->gpr[ra] = val & MASK64_R(mb);
+ goto logical_done;
+ case 2: /* rldic */
+ regs->gpr[ra] = val & MASK64(mb, 63 - sh);
+ goto logical_done;
+ case 3: /* rldimi */
+ imm = MASK64(mb, 63 - sh);
+ regs->gpr[ra] = (regs->gpr[ra] & ~imm) |
+ (val & imm);
+ goto logical_done;
+ }
+ } else {
+ sh = regs->gpr[rb] & 0x3f;
+ val = ROTATE(val, sh);
+ switch ((instr >> 1) & 7) {
+ case 0: /* rldcl */
+ regs->gpr[ra] = val & MASK64_L(mb);
+ goto logical_done;
+ case 1: /* rldcr */
+ regs->gpr[ra] = val & MASK64_R(mb);
+ goto logical_done;
+ }
+ }
+#endif
+
+ case 31:
+ switch ((instr >> 1) & 0x3ff) {
+ case 4: /* tw */
+ if (rd == 0x1f ||
+ (rd & trap_compare((int)regs->gpr[ra],
+ (int)regs->gpr[rb])))
+ goto trap;
+ goto instr_done;
+#ifdef __powerpc64__
+ case 68: /* td */
+ if (rd & trap_compare(regs->gpr[ra], regs->gpr[rb]))
+ goto trap;
+ goto instr_done;
+#endif
+ case 83: /* mfmsr */
+ if (regs->msr & MSR_PR)
+ goto priv;
+ op->type = MFMSR;
+ op->reg = rd;
+ return 0;
+ case 146: /* mtmsr */
+ if (regs->msr & MSR_PR)
+ goto priv;
+ op->type = MTMSR;
+ op->reg = rd;
+ op->val = 0xffffffff & ~(MSR_ME | MSR_LE);
+ return 0;
+#ifdef CONFIG_PPC64
+ case 178: /* mtmsrd */
+ if (regs->msr & MSR_PR)
+ goto priv;
+ op->type = MTMSR;
+ op->reg = rd;
+ /* only MSR_EE and MSR_RI get changed if bit 15 set */
+ /* mtmsrd doesn't change MSR_HV, MSR_ME or MSR_LE */
+ imm = (instr & 0x10000)? 0x8002: 0xefffffffffffeffeUL;
+ op->val = imm;
+ return 0;
+#endif
+
+ case 19: /* mfcr */
+ regs->gpr[rd] = regs->ccr;
+ regs->gpr[rd] &= 0xffffffffUL;
+ goto instr_done;
+
+ case 144: /* mtcrf */
+ imm = 0xf0000000UL;
+ val = regs->gpr[rd];
+ for (sh = 0; sh < 8; ++sh) {
+ if (instr & (0x80000 >> sh))
+ regs->ccr = (regs->ccr & ~imm) |
+ (val & imm);
+ imm >>= 4;
+ }
+ goto instr_done;
+
+ case 339: /* mfspr */
+ spr = ((instr >> 16) & 0x1f) | ((instr >> 6) & 0x3e0);
+ switch (spr) {
+ case SPRN_XER: /* mfxer */
+ regs->gpr[rd] = regs->xer;
+ regs->gpr[rd] &= 0xffffffffUL;
+ goto instr_done;
+ case SPRN_LR: /* mflr */
+ regs->gpr[rd] = regs->link;
+ goto instr_done;
+ case SPRN_CTR: /* mfctr */
+ regs->gpr[rd] = regs->ctr;
+ goto instr_done;
+ default:
+ op->type = MFSPR;
+ op->reg = rd;
+ op->spr = spr;
+ return 0;
+ }
+ break;
+
+ case 467: /* mtspr */
+ spr = ((instr >> 16) & 0x1f) | ((instr >> 6) & 0x3e0);
+ switch (spr) {
+ case SPRN_XER: /* mtxer */
+ regs->xer = (regs->gpr[rd] & 0xffffffffUL);
+ goto instr_done;
+ case SPRN_LR: /* mtlr */
+ regs->link = regs->gpr[rd];
+ goto instr_done;
+ case SPRN_CTR: /* mtctr */
+ regs->ctr = regs->gpr[rd];
+ goto instr_done;
+ default:
+ op->type = MTSPR;
+ op->val = regs->gpr[rd];
+ op->spr = spr;
+ return 0;
+ }
+ break;
+
+/*
+ * Compare instructions
+ */
+ case 0: /* cmp */
+ val = regs->gpr[ra];
+ val2 = regs->gpr[rb];
+#ifdef __powerpc64__
+ if ((rd & 1) == 0) {
+ /* word (32-bit) compare */
+ val = (int) val;
+ val2 = (int) val2;
+ }
+#endif
+ do_cmp_signed(regs, val, val2, rd >> 2);
+ goto instr_done;
+
+ case 32: /* cmpl */
+ val = regs->gpr[ra];
+ val2 = regs->gpr[rb];
+#ifdef __powerpc64__
+ if ((rd & 1) == 0) {
+ /* word (32-bit) compare */
+ val = (unsigned int) val;
+ val2 = (unsigned int) val2;
+ }
+#endif
+ do_cmp_unsigned(regs, val, val2, rd >> 2);
+ goto instr_done;
+
+/*
+ * Arithmetic instructions
+ */
+ case 8: /* subfc */
+ add_with_carry(regs, rd, ~regs->gpr[ra],
+ regs->gpr[rb], 1);
+ goto arith_done;
+#ifdef __powerpc64__
+ case 9: /* mulhdu */
+ asm("mulhdu %0,%1,%2" : "=r" (regs->gpr[rd]) :
+ "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
+ goto arith_done;
+#endif
+ case 10: /* addc */
+ add_with_carry(regs, rd, regs->gpr[ra],
+ regs->gpr[rb], 0);
+ goto arith_done;
+
+ case 11: /* mulhwu */
+ asm("mulhwu %0,%1,%2" : "=r" (regs->gpr[rd]) :
+ "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
+ goto arith_done;
+
+ case 40: /* subf */
+ regs->gpr[rd] = regs->gpr[rb] - regs->gpr[ra];
+ goto arith_done;
+#ifdef __powerpc64__
+ case 73: /* mulhd */
+ asm("mulhd %0,%1,%2" : "=r" (regs->gpr[rd]) :
+ "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
+ goto arith_done;
+#endif
+ case 75: /* mulhw */
+ asm("mulhw %0,%1,%2" : "=r" (regs->gpr[rd]) :
+ "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
+ goto arith_done;
+
+ case 104: /* neg */
+ regs->gpr[rd] = -regs->gpr[ra];
+ goto arith_done;
+
+ case 136: /* subfe */
+ add_with_carry(regs, rd, ~regs->gpr[ra], regs->gpr[rb],
+ regs->xer & XER_CA);
+ goto arith_done;
+
+ case 138: /* adde */
+ add_with_carry(regs, rd, regs->gpr[ra], regs->gpr[rb],
+ regs->xer & XER_CA);
+ goto arith_done;
+
+ case 200: /* subfze */
+ add_with_carry(regs, rd, ~regs->gpr[ra], 0L,
+ regs->xer & XER_CA);
+ goto arith_done;
+
+ case 202: /* addze */
+ add_with_carry(regs, rd, regs->gpr[ra], 0L,
+ regs->xer & XER_CA);
+ goto arith_done;
+
+ case 232: /* subfme */
+ add_with_carry(regs, rd, ~regs->gpr[ra], -1L,
+ regs->xer & XER_CA);
+ goto arith_done;
+#ifdef __powerpc64__
+ case 233: /* mulld */
+ regs->gpr[rd] = regs->gpr[ra] * regs->gpr[rb];
+ goto arith_done;
+#endif
+ case 234: /* addme */
+ add_with_carry(regs, rd, regs->gpr[ra], -1L,
+ regs->xer & XER_CA);
+ goto arith_done;
+
+ case 235: /* mullw */
+ regs->gpr[rd] = (unsigned int) regs->gpr[ra] *
+ (unsigned int) regs->gpr[rb];
+ goto arith_done;
+
+ case 266: /* add */
+ regs->gpr[rd] = regs->gpr[ra] + regs->gpr[rb];
+ goto arith_done;
+#ifdef __powerpc64__
+ case 457: /* divdu */
+ regs->gpr[rd] = regs->gpr[ra] / regs->gpr[rb];
+ goto arith_done;
+#endif
+ case 459: /* divwu */
+ regs->gpr[rd] = (unsigned int) regs->gpr[ra] /
+ (unsigned int) regs->gpr[rb];
+ goto arith_done;
+#ifdef __powerpc64__
+ case 489: /* divd */
+ regs->gpr[rd] = (long int) regs->gpr[ra] /
+ (long int) regs->gpr[rb];
+ goto arith_done;
+#endif
+ case 491: /* divw */
+ regs->gpr[rd] = (int) regs->gpr[ra] /
+ (int) regs->gpr[rb];
+ goto arith_done;
+
+
+/*
+ * Logical instructions
+ */
+ case 26: /* cntlzw */
+ asm("cntlzw %0,%1" : "=r" (regs->gpr[ra]) :
+ "r" (regs->gpr[rd]));
+ goto logical_done;
+#ifdef __powerpc64__
+ case 58: /* cntlzd */
+ asm("cntlzd %0,%1" : "=r" (regs->gpr[ra]) :
+ "r" (regs->gpr[rd]));
+ goto logical_done;
+#endif
+ case 28: /* and */
+ regs->gpr[ra] = regs->gpr[rd] & regs->gpr[rb];
+ goto logical_done;
+
+ case 60: /* andc */
+ regs->gpr[ra] = regs->gpr[rd] & ~regs->gpr[rb];
+ goto logical_done;
+
+ case 124: /* nor */
+ regs->gpr[ra] = ~(regs->gpr[rd] | regs->gpr[rb]);
+ goto logical_done;
+
+ case 284: /* xor */
+ regs->gpr[ra] = ~(regs->gpr[rd] ^ regs->gpr[rb]);
+ goto logical_done;
+
+ case 316: /* xor */
+ regs->gpr[ra] = regs->gpr[rd] ^ regs->gpr[rb];
+ goto logical_done;
+
+ case 412: /* orc */
+ regs->gpr[ra] = regs->gpr[rd] | ~regs->gpr[rb];
+ goto logical_done;
+
+ case 444: /* or */
+ regs->gpr[ra] = regs->gpr[rd] | regs->gpr[rb];
+ goto logical_done;
+
+ case 476: /* nand */
+ regs->gpr[ra] = ~(regs->gpr[rd] & regs->gpr[rb]);
+ goto logical_done;
+
+ case 922: /* extsh */
+ regs->gpr[ra] = (signed short) regs->gpr[rd];
+ goto logical_done;
+
+ case 954: /* extsb */
+ regs->gpr[ra] = (signed char) regs->gpr[rd];
+ goto logical_done;
+#ifdef __powerpc64__
+ case 986: /* extsw */
+ regs->gpr[ra] = (signed int) regs->gpr[rd];
+ goto logical_done;
+#endif
+
+/*
+ * Shift instructions
+ */
+ case 24: /* slw */
+ sh = regs->gpr[rb] & 0x3f;
+ if (sh < 32)
+ regs->gpr[ra] = (regs->gpr[rd] << sh) & 0xffffffffUL;
+ else
+ regs->gpr[ra] = 0;
+ goto logical_done;
+
+ case 536: /* srw */
+ sh = regs->gpr[rb] & 0x3f;
+ if (sh < 32)
+ regs->gpr[ra] = (regs->gpr[rd] & 0xffffffffUL) >> sh;
+ else
+ regs->gpr[ra] = 0;
+ goto logical_done;
+
+ case 792: /* sraw */
+ sh = regs->gpr[rb] & 0x3f;
+ ival = (signed int) regs->gpr[rd];
+ regs->gpr[ra] = ival >> (sh < 32 ? sh : 31);
+ if (ival < 0 && (sh >= 32 || (ival & ((1ul << sh) - 1)) != 0))
+ regs->xer |= XER_CA;
+ else
+ regs->xer &= ~XER_CA;
+ goto logical_done;
+
+ case 824: /* srawi */
+ sh = rb;
+ ival = (signed int) regs->gpr[rd];
+ regs->gpr[ra] = ival >> sh;
+ if (ival < 0 && (ival & ((1ul << sh) - 1)) != 0)
+ regs->xer |= XER_CA;
+ else
+ regs->xer &= ~XER_CA;
+ goto logical_done;
+
+#ifdef __powerpc64__
+ case 27: /* sld */
+ sh = regs->gpr[rb] & 0x7f;
+ if (sh < 64)
+ regs->gpr[ra] = regs->gpr[rd] << sh;
+ else
+ regs->gpr[ra] = 0;
+ goto logical_done;
+
+ case 539: /* srd */
+ sh = regs->gpr[rb] & 0x7f;
+ if (sh < 64)
+ regs->gpr[ra] = regs->gpr[rd] >> sh;
+ else
+ regs->gpr[ra] = 0;
+ goto logical_done;
+
+ case 794: /* srad */
+ sh = regs->gpr[rb] & 0x7f;
+ ival = (signed long int) regs->gpr[rd];
+ regs->gpr[ra] = ival >> (sh < 64 ? sh : 63);
+ if (ival < 0 && (sh >= 64 || (ival & ((1ul << sh) - 1)) != 0))
+ regs->xer |= XER_CA;
+ else
+ regs->xer &= ~XER_CA;
+ goto logical_done;
+
+ case 826: /* sradi with sh_5 = 0 */
+ case 827: /* sradi with sh_5 = 1 */
+ sh = rb | ((instr & 2) << 4);
+ ival = (signed long int) regs->gpr[rd];
+ regs->gpr[ra] = ival >> sh;
+ if (ival < 0 && (ival & ((1ul << sh) - 1)) != 0)
+ regs->xer |= XER_CA;
+ else
+ regs->xer &= ~XER_CA;
+ goto logical_done;
+#endif /* __powerpc64__ */
+
+/*
+ * Cache instructions
+ */
+ case 54: /* dcbst */
+ op->type = MKOP(CACHEOP, DCBST, 0);
+ op->ea = xform_ea(instr, regs);
+ return 0;
+
+ case 86: /* dcbf */
+ op->type = MKOP(CACHEOP, DCBF, 0);
+ op->ea = xform_ea(instr, regs);
+ return 0;
+
+ case 246: /* dcbtst */
+ op->type = MKOP(CACHEOP, DCBTST, 0);
+ op->ea = xform_ea(instr, regs);
+ op->reg = rd;
+ return 0;
+
+ case 278: /* dcbt */
+ op->type = MKOP(CACHEOP, DCBTST, 0);
+ op->ea = xform_ea(instr, regs);
+ op->reg = rd;
+ return 0;
+
+ case 982: /* icbi */
+ op->type = MKOP(CACHEOP, ICBI, 0);
+ op->ea = xform_ea(instr, regs);
+ return 0;
+ }
+ break;
+ }
+
+ /*
+ * Loads and stores.
+ */
+ op->type = UNKNOWN;
+ op->update_reg = ra;
+ op->reg = rd;
+ op->val = regs->gpr[rd];
+ u = (instr >> 20) & UPDATE;
+
+ switch (opcode) {
+ case 31:
+ u = instr & UPDATE;
+ op->ea = xform_ea(instr, regs);
+ switch ((instr >> 1) & 0x3ff) {
+ case 20: /* lwarx */
+ op->type = MKOP(LARX, 0, 4);
+ break;
+
+ case 150: /* stwcx. */
+ op->type = MKOP(STCX, 0, 4);
+ break;
+
+#ifdef __powerpc64__
+ case 84: /* ldarx */
+ op->type = MKOP(LARX, 0, 8);
+ break;
+
+ case 214: /* stdcx. */
+ op->type = MKOP(STCX, 0, 8);
+ break;
+
+ case 21: /* ldx */
+ case 53: /* ldux */
+ op->type = MKOP(LOAD, u, 8);
+ break;
+#endif
+
+ case 23: /* lwzx */
+ case 55: /* lwzux */
+ op->type = MKOP(LOAD, u, 4);
+ break;
+
+ case 87: /* lbzx */
+ case 119: /* lbzux */
+ op->type = MKOP(LOAD, u, 1);
+ break;
+
+#ifdef CONFIG_ALTIVEC
+ case 103: /* lvx */
+ case 359: /* lvxl */
+ if (!(regs->msr & MSR_VEC))
+ goto vecunavail;
+ op->type = MKOP(LOAD_VMX, 0, 16);
+ break;
+
+ case 231: /* stvx */
+ case 487: /* stvxl */
+ if (!(regs->msr & MSR_VEC))
+ goto vecunavail;
+ op->type = MKOP(STORE_VMX, 0, 16);
+ break;
+#endif /* CONFIG_ALTIVEC */
+
+#ifdef __powerpc64__
+ case 149: /* stdx */
+ case 181: /* stdux */
+ op->type = MKOP(STORE, u, 8);
+ break;
+#endif
+
+ case 151: /* stwx */
+ case 183: /* stwux */
+ op->type = MKOP(STORE, u, 4);
+ break;
+
+ case 215: /* stbx */
+ case 247: /* stbux */
+ op->type = MKOP(STORE, u, 1);
+ break;
+
+ case 279: /* lhzx */
+ case 311: /* lhzux */
+ op->type = MKOP(LOAD, u, 2);
+ break;
+
+#ifdef __powerpc64__
+ case 341: /* lwax */
+ case 373: /* lwaux */
+ op->type = MKOP(LOAD, SIGNEXT | u, 4);
+ break;
+#endif
+
+ case 343: /* lhax */
+ case 375: /* lhaux */
+ op->type = MKOP(LOAD, SIGNEXT | u, 2);
+ break;
+
+ case 407: /* sthx */
+ case 439: /* sthux */
+ op->type = MKOP(STORE, u, 2);
+ break;
+
+#ifdef __powerpc64__
+ case 532: /* ldbrx */
+ op->type = MKOP(LOAD, BYTEREV, 8);
+ break;
+
+#endif
+ case 533: /* lswx */
+ op->type = MKOP(LOAD_MULTI, 0, regs->xer & 0x7f);
+ break;
+
+ case 534: /* lwbrx */
+ op->type = MKOP(LOAD, BYTEREV, 4);
+ break;
+
+ case 597: /* lswi */
+ if (rb == 0)
+ rb = 32; /* # bytes to load */
+ op->type = MKOP(LOAD_MULTI, 0, rb);
+ op->ea = 0;
+ if (ra)
+ op->ea = truncate_if_32bit(regs->msr,
+ regs->gpr[ra]);
+ break;
+
+#ifdef CONFIG_PPC_FPU
+ case 535: /* lfsx */
+ case 567: /* lfsux */
+ if (!(regs->msr & MSR_FP))
+ goto fpunavail;
+ op->type = MKOP(LOAD_FP, u, 4);
+ break;
+
+ case 599: /* lfdx */
+ case 631: /* lfdux */
+ if (!(regs->msr & MSR_FP))
+ goto fpunavail;
+ op->type = MKOP(LOAD_FP, u, 8);
+ break;
+
+ case 663: /* stfsx */
+ case 695: /* stfsux */
+ if (!(regs->msr & MSR_FP))
+ goto fpunavail;
+ op->type = MKOP(STORE_FP, u, 4);
+ break;
+
+ case 727: /* stfdx */
+ case 759: /* stfdux */
+ if (!(regs->msr & MSR_FP))
+ goto fpunavail;
+ op->type = MKOP(STORE_FP, u, 8);
+ break;
+#endif
+
+#ifdef __powerpc64__
+ case 660: /* stdbrx */
+ op->type = MKOP(STORE, BYTEREV, 8);
+ op->val = byterev_8(regs->gpr[rd]);
+ break;
+
+#endif
+ case 661: /* stswx */
+ op->type = MKOP(STORE_MULTI, 0, regs->xer & 0x7f);
+ break;
+
+ case 662: /* stwbrx */
+ op->type = MKOP(STORE, BYTEREV, 4);
+ op->val = byterev_4(regs->gpr[rd]);
+ break;
+
+ case 725:
+ if (rb == 0)
+ rb = 32; /* # bytes to store */
+ op->type = MKOP(STORE_MULTI, 0, rb);
+ op->ea = 0;
+ if (ra)
+ op->ea = truncate_if_32bit(regs->msr,
+ regs->gpr[ra]);
+ break;
+
+ case 790: /* lhbrx */
+ op->type = MKOP(LOAD, BYTEREV, 2);
+ break;
+
+ case 918: /* sthbrx */
+ op->type = MKOP(STORE, BYTEREV, 2);
+ op->val = byterev_2(regs->gpr[rd]);
+ break;
+
+#ifdef CONFIG_VSX
+ case 844: /* lxvd2x */
+ case 876: /* lxvd2ux */
+ if (!(regs->msr & MSR_VSX))
+ goto vsxunavail;
+ op->reg = rd | ((instr & 1) << 5);
+ op->type = MKOP(LOAD_VSX, u, 16);
+ break;
+
+ case 972: /* stxvd2x */
+ case 1004: /* stxvd2ux */
+ if (!(regs->msr & MSR_VSX))
+ goto vsxunavail;
+ op->reg = rd | ((instr & 1) << 5);
+ op->type = MKOP(STORE_VSX, u, 16);
+ break;
+
+#endif /* CONFIG_VSX */
+ }
+ break;
+
+ case 32: /* lwz */
+ case 33: /* lwzu */
+ op->type = MKOP(LOAD, u, 4);
+ op->ea = dform_ea(instr, regs);
+ break;
+
+ case 34: /* lbz */
+ case 35: /* lbzu */
+ op->type = MKOP(LOAD, u, 1);
+ op->ea = dform_ea(instr, regs);
+ break;
+
+ case 36: /* stw */
+ case 37: /* stwu */
+ op->type = MKOP(STORE, u, 4);
+ op->ea = dform_ea(instr, regs);
+ break;
+
+ case 38: /* stb */
+ case 39: /* stbu */
+ op->type = MKOP(STORE, u, 1);
+ op->ea = dform_ea(instr, regs);
+ break;
+
+ case 40: /* lhz */
+ case 41: /* lhzu */
+ op->type = MKOP(LOAD, u, 2);
+ op->ea = dform_ea(instr, regs);
+ break;
+
+ case 42: /* lha */
+ case 43: /* lhau */
+ op->type = MKOP(LOAD, SIGNEXT | u, 2);
+ op->ea = dform_ea(instr, regs);
+ break;
+
+ case 44: /* sth */
+ case 45: /* sthu */
+ op->type = MKOP(STORE, u, 2);
+ op->ea = dform_ea(instr, regs);
+ break;
+
+ case 46: /* lmw */
+ if (ra >= rd)
+ break; /* invalid form, ra in range to load */
+ op->type = MKOP(LOAD_MULTI, 0, 4 * (32 - rd));
+ op->ea = dform_ea(instr, regs);
+ break;
+
+ case 47: /* stmw */
+ op->type = MKOP(STORE_MULTI, 0, 4 * (32 - rd));
+ op->ea = dform_ea(instr, regs);
+ break;
+
+#ifdef CONFIG_PPC_FPU
+ case 48: /* lfs */
+ case 49: /* lfsu */
+ if (!(regs->msr & MSR_FP))
+ goto fpunavail;
+ op->type = MKOP(LOAD_FP, u, 4);
+ op->ea = dform_ea(instr, regs);
+ break;
+
+ case 50: /* lfd */
+ case 51: /* lfdu */
+ if (!(regs->msr & MSR_FP))
+ goto fpunavail;
+ op->type = MKOP(LOAD_FP, u, 8);
+ op->ea = dform_ea(instr, regs);
+ break;
+
+ case 52: /* stfs */
+ case 53: /* stfsu */
+ if (!(regs->msr & MSR_FP))
+ goto fpunavail;
+ op->type = MKOP(STORE_FP, u, 4);
+ op->ea = dform_ea(instr, regs);
+ break;
+
+ case 54: /* stfd */
+ case 55: /* stfdu */
+ if (!(regs->msr & MSR_FP))
+ goto fpunavail;
+ op->type = MKOP(STORE_FP, u, 8);
+ op->ea = dform_ea(instr, regs);
+ break;
+#endif
+
+#ifdef __powerpc64__
+ case 58: /* ld[u], lwa */
+ op->ea = dsform_ea(instr, regs);
+ switch (instr & 3) {
+ case 0: /* ld */
+ op->type = MKOP(LOAD, 0, 8);
+ break;
+ case 1: /* ldu */
+ op->type = MKOP(LOAD, UPDATE, 8);
+ break;
+ case 2: /* lwa */
+ op->type = MKOP(LOAD, SIGNEXT, 4);
+ break;
+ }
+ break;
+
+ case 62: /* std[u] */
+ op->ea = dsform_ea(instr, regs);
+ switch (instr & 3) {
+ case 0: /* std */
+ op->type = MKOP(STORE, 0, 8);
+ break;
+ case 1: /* stdu */
+ op->type = MKOP(STORE, UPDATE, 8);
+ break;
+ }
+ break;
+#endif /* __powerpc64__ */
+
+ }
+ return 0;
+
+ logical_done:
+ if (instr & 1)
+ set_cr0(regs, ra);
+ goto instr_done;
+
+ arith_done:
+ if (instr & 1)
+ set_cr0(regs, rd);
+
+ instr_done:
+ regs->nip = truncate_if_32bit(regs->msr, regs->nip + 4);
+ return 1;
+
+ priv:
+ op->type = INTERRUPT | 0x700;
+ op->val = SRR1_PROGPRIV;
+ return 0;
+
+ trap:
+ op->type = INTERRUPT | 0x700;
+ op->val = SRR1_PROGTRAP;
+ return 0;
+
+#ifdef CONFIG_PPC_FPU
+ fpunavail:
+ op->type = INTERRUPT | 0x800;
+ return 0;
+#endif
+
+#ifdef CONFIG_ALTIVEC
+ vecunavail:
+ op->type = INTERRUPT | 0xf20;
+ return 0;
+#endif
+
+#ifdef CONFIG_VSX
+ vsxunavail:
+ op->type = INTERRUPT | 0xf40;
+ return 0;
+#endif
+}
+EXPORT_SYMBOL_GPL(analyse_instr);
+
+/*
+ * For PPC32 we always use stwu with r1 to change the stack pointer.
+ * So this emulated store may corrupt the exception frame, now we
+ * have to provide the exception frame trampoline, which is pushed
+ * below the kprobed function stack. So we only update gpr[1] but
+ * don't emulate the real store operation. We will do real store
+ * operation safely in exception return code by checking this flag.
+ */
+static __kprobes int handle_stack_update(unsigned long ea, struct pt_regs *regs)
+{
+#ifdef CONFIG_PPC32
+ /*
+ * Check if we will touch kernel stack overflow
+ */
+ if (ea - STACK_INT_FRAME_SIZE <= current->thread.ksp_limit) {
+ printk(KERN_CRIT "Can't kprobe this since kernel stack would overflow.\n");
+ return -EINVAL;
+ }
+#endif /* CONFIG_PPC32 */
+ /*
+ * Check if we already set since that means we'll
+ * lose the previous value.
+ */
+ WARN_ON(test_thread_flag(TIF_EMULATE_STACK_STORE));
+ set_thread_flag(TIF_EMULATE_STACK_STORE);
+ return 0;
+}
+
+static __kprobes void do_signext(unsigned long *valp, int size)
+{
+ switch (size) {
+ case 2:
+ *valp = (signed short) *valp;
+ break;
+ case 4:
+ *valp = (signed int) *valp;
+ break;
+ }
+}
+
+static __kprobes void do_byterev(unsigned long *valp, int size)
+{
+ switch (size) {
+ case 2:
+ *valp = byterev_2(*valp);
+ break;
+ case 4:
+ *valp = byterev_4(*valp);
+ break;
+#ifdef __powerpc64__
+ case 8:
+ *valp = byterev_8(*valp);
+ break;
+#endif
+ }
+}
+
+/*
+ * Emulate instructions that cause a transfer of control,
+ * loads and stores, and a few other instructions.
+ * 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 __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
+{
+ struct instruction_op op;
+ int r, err, size;
+ unsigned long val;
+ unsigned int cr;
+ int i, rd, nb;
+
+ r = analyse_instr(&op, regs, instr);
+ if (r != 0)
+ return r;
+
+ err = 0;
+ size = GETSIZE(op.type);
+ switch (op.type & INSTR_TYPE_MASK) {
+ case CACHEOP:
+ if (!address_ok(regs, op.ea, 8))
+ return 0;
+ switch (op.type & CACHEOP_MASK) {
+ case DCBST:
+ __cacheop_user_asmx(op.ea, err, "dcbst");
+ break;
+ case DCBF:
+ __cacheop_user_asmx(op.ea, err, "dcbf");
+ break;
+ case DCBTST:
+ if (op.reg == 0)
+ prefetchw((void *) op.ea);
+ break;
+ case DCBT:
+ if (op.reg == 0)
+ prefetch((void *) op.ea);
+ break;
+ case ICBI:
+ __cacheop_user_asmx(op.ea, err, "icbi");
+ break;
+ }
+ if (err)
+ return 0;
+ goto instr_done;
+
+ case LARX:
+ if (regs->msr & MSR_LE)
+ return 0;
+ if (op.ea & (size - 1))
+ break; /* can't handle misaligned */
+ err = -EFAULT;
+ if (!address_ok(regs, op.ea, size))
+ goto ldst_done;
+ err = 0;
+ switch (size) {
+ case 4:
+ __get_user_asmx(val, op.ea, err, "lwarx");
+ break;
+ case 8:
+ __get_user_asmx(val, op.ea, err, "ldarx");
+ break;
+ default:
+ return 0;
+ }
+ if (!err)
+ regs->gpr[op.reg] = val;
+ goto ldst_done;
+
+ case STCX:
+ if (regs->msr & MSR_LE)
+ return 0;
+ if (op.ea & (size - 1))
+ break; /* can't handle misaligned */
+ err = -EFAULT;
+ if (!address_ok(regs, op.ea, size))
+ goto ldst_done;
+ err = 0;
+ switch (size) {
+ case 4:
+ __put_user_asmx(op.val, op.ea, err, "stwcx.", cr);
+ break;
+ case 8:
+ __put_user_asmx(op.val, op.ea, err, "stdcx.", cr);
+ break;
+ default:
+ return 0;
+ }
+ if (!err)
+ regs->ccr = (regs->ccr & 0x0fffffff) |
+ (cr & 0xe0000000) |
+ ((regs->xer >> 3) & 0x10000000);
+ goto ldst_done;
+
+ case LOAD:
+ if (regs->msr & MSR_LE)
+ return 0;
+ err = read_mem(&regs->gpr[op.reg], op.ea, size, regs);
+ if (!err) {
+ if (op.type & SIGNEXT)
+ do_signext(&regs->gpr[op.reg], size);
+ if (op.type & BYTEREV)
+ do_byterev(&regs->gpr[op.reg], size);
+ }
+ goto ldst_done;
+
+#ifdef CONFIG_PPC_FPU
+ case LOAD_FP:
+ if (regs->msr & MSR_LE)
+ return 0;
+ if (size == 4)
+ err = do_fp_load(op.reg, do_lfs, op.ea, size, regs);
+ else
+ err = do_fp_load(op.reg, do_lfd, op.ea, size, regs);
+ goto ldst_done;
+#endif
+#ifdef CONFIG_ALTIVEC
+ case LOAD_VMX:
+ if (regs->msr & MSR_LE)
+ return 0;
+ err = do_vec_load(op.reg, do_lvx, op.ea & ~0xfUL, regs);
+ goto ldst_done;
+#endif
+#ifdef CONFIG_VSX
+ case LOAD_VSX:
+ if (regs->msr & MSR_LE)
+ return 0;
+ err = do_vsx_load(op.reg, do_lxvd2x, op.ea, regs);
+ goto ldst_done;
+#endif
+ case LOAD_MULTI:
+ if (regs->msr & MSR_LE)
+ return 0;
+ rd = op.reg;
+ for (i = 0; i < size; i += 4) {
+ nb = size - i;
+ if (nb > 4)
+ nb = 4;
+ err = read_mem(&regs->gpr[rd], op.ea, nb, regs);
+ if (err)
+ return 0;
+ if (nb < 4) /* left-justify last bytes */
+ regs->gpr[rd] <<= 32 - 8 * nb;
+ op.ea += 4;
+ ++rd;
+ }
+ goto instr_done;
+
+ case STORE:
+ if (regs->msr & MSR_LE)
+ return 0;
+ if ((op.type & UPDATE) && size == sizeof(long) &&
+ op.reg == 1 && op.update_reg == 1 &&
+ !(regs->msr & MSR_PR) &&
+ op.ea >= regs->gpr[1] - STACK_INT_FRAME_SIZE) {
+ err = handle_stack_update(op.ea, regs);
+ goto ldst_done;
+ }
+ err = write_mem(op.val, op.ea, size, regs);
+ goto ldst_done;
+
+#ifdef CONFIG_PPC_FPU
+ case STORE_FP:
+ if (regs->msr & MSR_LE)
+ return 0;
+ if (size == 4)
+ err = do_fp_store(op.reg, do_stfs, op.ea, size, regs);
+ else
+ err = do_fp_store(op.reg, do_stfd, op.ea, size, regs);
+ goto ldst_done;
+#endif
+#ifdef CONFIG_ALTIVEC
+ case STORE_VMX:
+ if (regs->msr & MSR_LE)
+ return 0;
+ err = do_vec_store(op.reg, do_stvx, op.ea & ~0xfUL, regs);
+ goto ldst_done;
+#endif
+#ifdef CONFIG_VSX
+ case STORE_VSX:
+ if (regs->msr & MSR_LE)
+ return 0;
+ err = do_vsx_store(op.reg, do_stxvd2x, op.ea, regs);
+ goto ldst_done;
+#endif
+ case STORE_MULTI:
+ if (regs->msr & MSR_LE)
+ return 0;
+ rd = op.reg;
+ for (i = 0; i < size; i += 4) {
+ val = regs->gpr[rd];
+ nb = size - i;
+ if (nb > 4)
+ nb = 4;
+ else
+ val >>= 32 - 8 * nb;
+ err = write_mem(val, op.ea, nb, regs);
+ if (err)
+ return 0;
+ op.ea += 4;
+ ++rd;
+ }
+ goto instr_done;
+
+ case MFMSR:
+ regs->gpr[op.reg] = regs->msr & MSR_MASK;
+ goto instr_done;
+
+ case MTMSR:
+ val = regs->gpr[op.reg];
+ if ((val & MSR_RI) == 0)
+ /* can't step mtmsr[d] that would clear MSR_RI */
+ return -1;
+ /* here op.val is the mask of bits to change */
+ regs->msr = (regs->msr & ~op.val) | (val & op.val);
+ goto instr_done;
+
+#ifdef CONFIG_PPC64
+ case SYSCALL: /* sc */
+ /*
+ * N.B. this uses knowledge about how the syscall
+ * entry code works. If that is changed, this will
+ * need to be changed also.
+ */
+ if (regs->gpr[0] == 0x1ebe &&
+ cpu_has_feature(CPU_FTR_REAL_LE)) {
+ regs->msr ^= MSR_LE;
+ goto instr_done;
+ }
+ regs->gpr[9] = regs->gpr[13];
+ regs->gpr[10] = MSR_KERNEL;
+ 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 RFI:
+ return -1;
+#endif
+ }
+ return 0;
+
+ ldst_done:
+ if (err)
+ return 0;
+ if (op.type & UPDATE)
+ regs->gpr[op.update_reg] = op.ea;
+
+ instr_done:
+ regs->nip = truncate_if_32bit(regs->msr, regs->nip + 4);
+ return 1;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-16 09:21:24 +0000