renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-18 10:13:57 +08:00
Code
e0a0986b44
linux-next/arch/powerpc/lib/sstep.c
Paul Mackerras e0a0986b44 powerpc: Make load/store emulation use larger memory accesses 
At the moment, emulation of loads and stores of up to 8 bytes to
unaligned addresses on a little-endian system uses a sequence of
single-byte loads or stores to memory.  This is rather inefficient,
and the code is hard to follow because it has many ifdefs.
In addition, the Power ISA has requirements on how unaligned accesses
are performed, which are not met by doing all accesses as
sequences of single-byte accesses.

Emulation of VSX loads and stores uses __copy_{to,from}_user,
which means the emulation code has no control on the size of
accesses.

To simplify this, we add new copy_mem_in() and copy_mem_out()
functions for accessing memory.  These use a sequence of the largest
possible aligned accesses, up to 8 bytes (or 4 on 32-bit systems),
to copy memory between a local buffer and user memory.  We then
rewrite {read,write}_mem_unaligned and the VSX load/store
emulation using these new functions.

These new functions also simplify the code in do_fp_load() and
do_fp_store() for the unaligned cases.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-09-01 16:39:51 +10:00

2711 lines
59 KiB
C
Raw Blame History

/*
* 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 <linux/uaccess.h>
#include <asm/cpu_has_feature.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 void load_vsrn(int vsr, const void *p);
extern void store_vsrn(int vsr, void *p);
extern void conv_sp_to_dp(const float *sp, double *dp);
extern void conv_dp_to_sp(const double *dp, float *sp);
#endif
#ifdef __powerpc64__
/*
* Functions in quad.S
*/
extern int do_lq(unsigned long ea, unsigned long *regs);
extern int do_stq(unsigned long ea, unsigned long val0, unsigned long val1);
extern int do_lqarx(unsigned long ea, unsigned long *regs);
extern int do_stqcx(unsigned long ea, unsigned long val0, unsigned long val1,
unsigned int *crp);
#endif
#ifdef __LITTLE_ENDIAN__
#define IS_LE 1
#define IS_BE 0
#else
#define IS_LE 0
#define IS_BE 1
#endif
/*
* Emulate the truncation of 64 bit values in 32-bit mode.
*/
static nokprobe_inline 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 nokprobe_inline int branch_taken(unsigned int instr,
const struct pt_regs *regs,
struct instruction_op *op)
{
unsigned int bo = (instr >> 21) & 0x1f;
unsigned int bi;
if ((bo & 4) == 0) {
/* decrement counter */
op->type |= DECCTR;
if (((bo >> 1) & 1) ^ (regs->ctr == 1))
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 nokprobe_inline long 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 nokprobe_inline unsigned long dform_ea(unsigned int instr,
const 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 ea;
}
#ifdef __powerpc64__
/*
* Calculate effective address for a DS-form instruction
*/
static nokprobe_inline unsigned long dsform_ea(unsigned int instr,
const 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 ea;
}
/*
* Calculate effective address for a DQ-form instruction
*/
static nokprobe_inline unsigned long dqform_ea(unsigned int instr,
const struct pt_regs *regs)
{
int ra;
unsigned long ea;
ra = (instr >> 16) & 0x1f;
ea = (signed short) (instr & ~0xf); /* sign-extend */
if (ra)
ea += regs->gpr[ra];
return ea;
}
#endif /* __powerpc64 */
/*
* Calculate effective address for an X-form instruction
*/
static nokprobe_inline unsigned long xform_ea(unsigned int instr,
const 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 ea;
}
/*
* Return the largest power of 2, not greater than sizeof(unsigned long),
* such that x is a multiple of it.
*/
static nokprobe_inline unsigned long max_align(unsigned long x)
{
x |= sizeof(unsigned long);
return x & -x; /* isolates rightmost bit */
}
static nokprobe_inline unsigned long byterev_2(unsigned long x)
{
return ((x >> 8) & 0xff) | ((x & 0xff) << 8);
}
static nokprobe_inline unsigned long byterev_4(unsigned long x)
{
return ((x >> 24) & 0xff) | ((x >> 8) & 0xff00) |
((x & 0xff00) << 8) | ((x & 0xff) << 24);
}
#ifdef __powerpc64__
static nokprobe_inline unsigned long byterev_8(unsigned long x)
{
return (byterev_4(x) << 32) | byterev_4(x >> 32);
}
#endif
static nokprobe_inline int 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;
}
/*
* Copy from userspace to a buffer, using the largest possible
* aligned accesses, up to sizeof(long).
*/
static int nokprobe_inline copy_mem_in(u8 *dest, unsigned long ea, int nb)
{
int err = 0;
int c;
for (; nb > 0; nb -= c) {
c = max_align(ea);
if (c > nb)
c = max_align(nb);
switch (c) {
case 1:
err = __get_user(*dest, (unsigned char __user *) ea);
break;
case 2:
err = __get_user(*(u16 *)dest,
(unsigned short __user *) ea);
break;
case 4:
err = __get_user(*(u32 *)dest,
(unsigned int __user *) ea);
break;
#ifdef __powerpc64__
case 8:
err = __get_user(*(unsigned long *)dest,
(unsigned long __user *) ea);
break;
#endif
}
if (err)
return err;
dest += c;
ea += c;
}
return 0;
}
static nokprobe_inline int read_mem_unaligned(unsigned long *dest,
unsigned long ea, int nb,
struct pt_regs *regs)
{
union {
unsigned long ul;
u8 b[sizeof(unsigned long)];
} u;
int i;
int err;
u.ul = 0;
i = IS_BE ? sizeof(unsigned long) - nb : 0;
err = copy_mem_in(&u.b[i], ea, nb);
if (!err)
*dest = u.ul;
return err;
}
/*
* Read memory at address ea for nb bytes, return 0 for success
* or -EFAULT if an error occurred. N.B. nb must be 1, 2, 4 or 8.
* If nb < sizeof(long), the result is right-justified on BE systems.
*/
static int 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);
}
NOKPROBE_SYMBOL(read_mem);
static nokprobe_inline int 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;
}
/*
* Copy from a buffer to userspace, using the largest possible
* aligned accesses, up to sizeof(long).
*/
static int nokprobe_inline copy_mem_out(u8 *dest, unsigned long ea, int nb)
{
int err = 0;
int c;
for (; nb > 0; nb -= c) {
c = max_align(ea);
if (c > nb)
c = max_align(nb);
switch (c) {
case 1:
err = __put_user(*dest, (unsigned char __user *) ea);
break;
case 2:
err = __put_user(*(u16 *)dest,
(unsigned short __user *) ea);
break;
case 4:
err = __put_user(*(u32 *)dest,
(unsigned int __user *) ea);
break;
#ifdef __powerpc64__
case 8:
err = __put_user(*(unsigned long *)dest,
(unsigned long __user *) ea);
break;
#endif
}
if (err)
return err;
dest += c;
ea += c;
}
return 0;
}
static nokprobe_inline int write_mem_unaligned(unsigned long val,
unsigned long ea, int nb,
struct pt_regs *regs)
{
union {
unsigned long ul;
u8 b[sizeof(unsigned long)];
} u;
int i;
u.ul = val;
i = IS_BE ? sizeof(unsigned long) - nb : 0;
return copy_mem_out(&u.b[i], ea, nb);
}
/*
* Write memory at address ea for nb bytes, return 0 for success
* or -EFAULT if an error occurred. N.B. nb must be 1, 2, 4 or 8.
*/
static int 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);
}
NOKPROBE_SYMBOL(write_mem);
#ifdef CONFIG_PPC_FPU
/*
* Check the address and alignment, and call func to do the actual
* load or store.
*/
static int do_fp_load(int rn, int (*func)(int, unsigned long),
unsigned long ea, int nb,
struct pt_regs *regs)
{
int err;
u8 buf[sizeof(double)] __attribute__((aligned(sizeof(double))));
if (!address_ok(regs, ea, nb))
return -EFAULT;
if (ea & 3) {
err = copy_mem_in(buf, ea, nb);
if (err)
return err;
ea = (unsigned long) buf;
}
return (*func)(rn, ea);
}
NOKPROBE_SYMBOL(do_fp_load);
static int do_fp_store(int rn, int (*func)(int, unsigned long),
unsigned long ea, int nb,
struct pt_regs *regs)
{
int err;
u8 buf[sizeof(double)] __attribute__((aligned(sizeof(double))));
if (!address_ok(regs, ea, nb))
return -EFAULT;
if ((ea & 3) == 0)
return (*func)(rn, ea);
err = (*func)(rn, (unsigned long) buf);
if (!err)
err = copy_mem_out(buf, ea, nb);
return err;
}
NOKPROBE_SYMBOL(do_fp_store);
#endif
#ifdef CONFIG_ALTIVEC
/* For Altivec/VMX, no need to worry about alignment */
static nokprobe_inline int 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 nokprobe_inline int 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 __powerpc64__
static nokprobe_inline int emulate_lq(struct pt_regs *regs, unsigned long ea,
int reg)
{
int err;
if (!address_ok(regs, ea, 16))
return -EFAULT;
/* if aligned, should be atomic */
if ((ea & 0xf) == 0)
return do_lq(ea, &regs->gpr[reg]);
err = read_mem(&regs->gpr[reg + IS_LE], ea, 8, regs);
if (!err)
err = read_mem(&regs->gpr[reg + IS_BE], ea + 8, 8, regs);
return err;
}
static nokprobe_inline int emulate_stq(struct pt_regs *regs, unsigned long ea,
int reg)
{
int err;
if (!address_ok(regs, ea, 16))
return -EFAULT;
/* if aligned, should be atomic */
if ((ea & 0xf) == 0)
return do_stq(ea, regs->gpr[reg], regs->gpr[reg + 1]);
err = write_mem(regs->gpr[reg + IS_LE], ea, 8, regs);
if (!err)
err = write_mem(regs->gpr[reg + IS_BE], ea + 8, 8, regs);
return err;
}
#endif /* __powerpc64 */
#ifdef CONFIG_VSX
void emulate_vsx_load(struct instruction_op *op, union vsx_reg *reg,
const void *mem)
{
int size, read_size;
int i, j;
const unsigned int *wp;
const unsigned short *hp;
const unsigned char *bp;
size = GETSIZE(op->type);
reg->d[0] = reg->d[1] = 0;
switch (op->element_size) {
case 16:
/* whole vector; lxv[x] or lxvl[l] */
if (size == 0)
break;
memcpy(reg, mem, size);
if (IS_LE && (op->vsx_flags & VSX_LDLEFT)) {
/* reverse 16 bytes */
unsigned long tmp;
tmp = byterev_8(reg->d[0]);
reg->d[0] = byterev_8(reg->d[1]);
reg->d[1] = tmp;
}
break;
case 8:
/* scalar loads, lxvd2x, lxvdsx */
read_size = (size >= 8) ? 8 : size;
i = IS_LE ? 8 : 8 - read_size;
memcpy(&reg->b[i], mem, read_size);
if (size < 8) {
if (op->type & SIGNEXT) {
/* size == 4 is the only case here */
reg->d[IS_LE] = (signed int) reg->d[IS_LE];
} else if (op->vsx_flags & VSX_FPCONV) {
preempt_disable();
conv_sp_to_dp(&reg->fp[1 + IS_LE],
&reg->dp[IS_LE]);
preempt_enable();
}
} else {
if (size == 16)
reg->d[IS_BE] = *(unsigned long *)(mem + 8);
else if (op->vsx_flags & VSX_SPLAT)
reg->d[IS_BE] = reg->d[IS_LE];
}
break;
case 4:
/* lxvw4x, lxvwsx */
wp = mem;
for (j = 0; j < size / 4; ++j) {
i = IS_LE ? 3 - j : j;
reg->w[i] = *wp++;
}
if (op->vsx_flags & VSX_SPLAT) {
u32 val = reg->w[IS_LE ? 3 : 0];
for (; j < 4; ++j) {
i = IS_LE ? 3 - j : j;
reg->w[i] = val;
}
}
break;
case 2:
/* lxvh8x */
hp = mem;
for (j = 0; j < size / 2; ++j) {
i = IS_LE ? 7 - j : j;
reg->h[i] = *hp++;
}
break;
case 1:
/* lxvb16x */
bp = mem;
for (j = 0; j < size; ++j) {
i = IS_LE ? 15 - j : j;
reg->b[i] = *bp++;
}
break;
}
}
EXPORT_SYMBOL_GPL(emulate_vsx_load);
NOKPROBE_SYMBOL(emulate_vsx_load);
void emulate_vsx_store(struct instruction_op *op, const union vsx_reg *reg,
void *mem)
{
int size, write_size;
int i, j;
union vsx_reg buf;
unsigned int *wp;
unsigned short *hp;
unsigned char *bp;
size = GETSIZE(op->type);
switch (op->element_size) {
case 16:
/* stxv, stxvx, stxvl, stxvll */
if (size == 0)
break;
if (IS_LE && (op->vsx_flags & VSX_LDLEFT)) {
/* reverse 16 bytes */
buf.d[0] = byterev_8(reg->d[1]);
buf.d[1] = byterev_8(reg->d[0]);
reg = &buf;
}
memcpy(mem, reg, size);
break;
case 8:
/* scalar stores, stxvd2x */
write_size = (size >= 8) ? 8 : size;
i = IS_LE ? 8 : 8 - write_size;
if (size < 8 && op->vsx_flags & VSX_FPCONV) {
buf.d[0] = buf.d[1] = 0;
preempt_disable();
conv_dp_to_sp(&reg->dp[IS_LE], &buf.fp[1 + IS_LE]);
preempt_enable();
reg = &buf;
}
memcpy(mem, &reg->b[i], write_size);
if (size == 16)
memcpy(mem + 8, &reg->d[IS_BE], 8);
break;
case 4:
/* stxvw4x */
wp = mem;
for (j = 0; j < size / 4; ++j) {
i = IS_LE ? 3 - j : j;
*wp++ = reg->w[i];
}
break;
case 2:
/* stxvh8x */
hp = mem;
for (j = 0; j < size / 2; ++j) {
i = IS_LE ? 7 - j : j;
*hp++ = reg->h[i];
}
break;
case 1:
/* stvxb16x */
bp = mem;
for (j = 0; j < size; ++j) {
i = IS_LE ? 15 - j : j;
*bp++ = reg->b[i];
}
break;
}
}
EXPORT_SYMBOL_GPL(emulate_vsx_store);
NOKPROBE_SYMBOL(emulate_vsx_store);
#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" \
EX_TABLE(1b, 3b) \
: "=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" \
EX_TABLE(1b, 3b) \
: "=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" \
EX_TABLE(1b, 3b) \
: "=r" (err) \
: "r" (addr), "i" (-EFAULT), "0" (err))
static nokprobe_inline void set_cr0(const struct pt_regs *regs,
struct instruction_op *op, int rd)
{
long val = regs->gpr[rd];
op->type |= SETCC;
op->ccval = (regs->ccr & 0x0fffffff) | ((regs->xer >> 3) & 0x10000000);
#ifdef __powerpc64__
if (!(regs->msr & MSR_64BIT))
val = (int) val;
#endif
if (val < 0)
op->ccval |= 0x80000000;
else if (val > 0)
op->ccval |= 0x40000000;
else
op->ccval |= 0x20000000;
}
static nokprobe_inline void add_with_carry(const struct pt_regs *regs,
struct instruction_op *op, int rd,
unsigned long val1, unsigned long val2,
unsigned long carry_in)
{
unsigned long val = val1 + val2;
if (carry_in)
++val;
op->type = COMPUTE + SETREG + SETXER;
op->reg = rd;
op->val = val;
#ifdef __powerpc64__
if (!(regs->msr & MSR_64BIT)) {
val = (unsigned int) val;
val1 = (unsigned int) val1;
}
#endif
op->xerval = regs->xer;
if (val < val1 || (carry_in && val == val1))
op->xerval |= XER_CA;
else
op->xerval &= ~XER_CA;
}
static nokprobe_inline void do_cmp_signed(const struct pt_regs *regs,
struct instruction_op *op,
long v1, long v2, int crfld)
{
unsigned int crval, shift;
op->type = COMPUTE + SETCC;
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;
op->ccval = (regs->ccr & ~(0xf << shift)) | (crval << shift);
}
static nokprobe_inline void do_cmp_unsigned(const struct pt_regs *regs,
struct instruction_op *op,
unsigned long v1,
unsigned long v2, int crfld)
{
unsigned int crval, shift;
op->type = COMPUTE + SETCC;
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;
op->ccval = (regs->ccr & ~(0xf << shift)) | (crval << shift);
}
static nokprobe_inline void do_cmpb(const struct pt_regs *regs,
struct instruction_op *op,
unsigned long v1, unsigned long v2)
{
unsigned long long out_val, mask;
int i;
out_val = 0;
for (i = 0; i < 8; i++) {
mask = 0xffUL << (i * 8);
if ((v1 & mask) == (v2 & mask))
out_val |= mask;
}
op->val = out_val;
}
/*
* The size parameter is used to adjust the equivalent popcnt instruction.
* popcntb = 8, popcntw = 32, popcntd = 64
*/
static nokprobe_inline void do_popcnt(const struct pt_regs *regs,
struct instruction_op *op,
unsigned long v1, int size)
{
unsigned long long out = v1;
out -= (out >> 1) & 0x5555555555555555;
out = (0x3333333333333333 & out) + (0x3333333333333333 & (out >> 2));
out = (out + (out >> 4)) & 0x0f0f0f0f0f0f0f0f;
if (size == 8) { /* popcntb */
op->val = out;
return;
}
out += out >> 8;
out += out >> 16;
if (size == 32) { /* popcntw */
op->val = out & 0x0000003f0000003f;
return;
}
out = (out + (out >> 32)) & 0x7f;
op->val = out; /* popcntd */
}
#ifdef CONFIG_PPC64
static nokprobe_inline void do_bpermd(const struct pt_regs *regs,
struct instruction_op *op,
unsigned long v1, unsigned long v2)
{
unsigned char perm, idx;
unsigned int i;
perm = 0;
for (i = 0; i < 8; i++) {
idx = (v1 >> (i * 8)) & 0xff;
if (idx < 64)
if (v2 & PPC_BIT(idx))
perm |= 1 << i;
}
op->val = perm;
}
#endif /* CONFIG_PPC64 */
/*
* The size parameter adjusts the equivalent prty instruction.
* prtyw = 32, prtyd = 64
*/
static nokprobe_inline void do_prty(const struct pt_regs *regs,
struct instruction_op *op,
unsigned long v, int size)
{
unsigned long long res = v ^ (v >> 8);
res ^= res >> 16;
if (size == 32) { /* prtyw */
op->val = res & 0x0000000100000001;
return;
}
res ^= res >> 32;
op->val = res & 1; /*prtyd */
}
static nokprobe_inline int 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 return information about it in *op
* without changing *regs.
* Integer arithmetic and logical instructions, branches, and barrier
* instructions can be emulated just using the information in *op.
*
* Return value is 1 if the instruction can be emulated just by
* updating *regs with the information in *op, -1 if we need the
* GPRs but *regs doesn't contain the full register set, or 0
* otherwise.
*/
int analyse_instr(struct instruction_op *op, const 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;
op->val = truncate_if_32bit(regs->msr, imm);
if (instr & 1)
op->type |= SETLK;
if (branch_taken(instr, regs, op))
op->type |= BRTAKEN;
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 | BRTAKEN;
imm = instr & 0x03fffffc;
if (imm & 0x02000000)
imm -= 0x04000000;
if ((instr & 2) == 0)
imm += regs->nip;
op->val = truncate_if_32bit(regs->msr, imm);
if (instr & 1)
op->type |= SETLK;
return 1;
case 19:
switch ((instr >> 1) & 0x3ff) {
case 0: /* mcrf */
op->type = COMPUTE + SETCC;
rd = 7 - ((instr >> 23) & 0x7);
ra = 7 - ((instr >> 18) & 0x7);
rd *= 4;
ra *= 4;
val = (regs->ccr >> ra) & 0xf;
op->ccval = (regs->ccr & ~(0xfUL << rd)) | (val << rd);
return 1;
case 16: /* bclr */
case 528: /* bcctr */
op->type = BRANCH;
imm = (instr & 0x400)? regs->ctr: regs->link;
op->val = truncate_if_32bit(regs->msr, imm);
if (instr & 1)
op->type |= SETLK;
if (branch_taken(instr, regs, op))
op->type |= BRTAKEN;
return 1;
case 18: /* rfid, scary */
if (regs->msr & MSR_PR)
goto priv;
op->type = RFI;
return 0;
case 150: /* isync */
op->type = BARRIER | BARRIER_ISYNC;
return 1;
case 33: /* crnor */
case 129: /* crandc */
case 193: /* crxor */
case 225: /* crnand */
case 257: /* crand */
case 289: /* creqv */
case 417: /* crorc */
case 449: /* cror */
op->type = COMPUTE + SETCC;
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;
op->ccval = (regs->ccr & ~(1UL << (31 - rd))) |
(val << (31 - rd));
return 1;
}
break;
case 31:
switch ((instr >> 1) & 0x3ff) {
case 598: /* sync */
op->type = BARRIER + BARRIER_SYNC;
#ifdef __powerpc64__
switch ((instr >> 21) & 3) {
case 1: /* lwsync */
op->type = BARRIER + BARRIER_LWSYNC;
break;
case 2: /* ptesync */
op->type = BARRIER + BARRIER_PTESYNC;
break;
}
#endif
return 1;
case 854: /* eieio */
op->type = BARRIER + BARRIER_EIEIO;
return 1;
}
break;
}
/* Following cases refer to regs->gpr[], so we need all regs */
if (!FULL_REGS(regs))
return -1;
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;
return 1;
#endif
case 3: /* twi */
if (rd & trap_compare((int)regs->gpr[ra], (short) instr))
goto trap;
return 1;
case 7: /* mulli */
op->val = regs->gpr[ra] * (short) instr;
goto compute_done;
case 8: /* subfic */
imm = (short) instr;
add_with_carry(regs, op, rd, ~regs->gpr[ra], imm, 1);
return 1;
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, op, val, imm, rd >> 2);
return 1;
case 11: /* cmpi */
imm = (short) instr;
val = regs->gpr[ra];
#ifdef __powerpc64__
if ((rd & 1) == 0)
val = (int) val;
#endif
do_cmp_signed(regs, op, val, imm, rd >> 2);
return 1;
case 12: /* addic */
imm = (short) instr;
add_with_carry(regs, op, rd, regs->gpr[ra], imm, 0);
return 1;
case 13: /* addic. */
imm = (short) instr;
add_with_carry(regs, op, rd, regs->gpr[ra], imm, 0);
set_cr0(regs, op, rd);
return 1;
case 14: /* addi */
imm = (short) instr;
if (ra)
imm += regs->gpr[ra];
op->val = imm;
goto compute_done;
case 15: /* addis */
imm = ((short) instr) << 16;
if (ra)
imm += regs->gpr[ra];
op->val = imm;
goto compute_done;
case 19:
if (((instr >> 1) & 0x1f) == 2) {
/* addpcis */
imm = (short) (instr & 0xffc1); /* d0 + d2 fields */
imm |= (instr >> 15) & 0x3e; /* d1 field */
op->val = regs->nip + (imm << 16) + 4;
goto compute_done;
}
op->type = UNKNOWN;
return 0;
case 20: /* rlwimi */
mb = (instr >> 6) & 0x1f;
me = (instr >> 1) & 0x1f;
val = DATA32(regs->gpr[rd]);
imm = MASK32(mb, me);
op->val = (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]);
op->val = 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]);
op->val = ROTATE(val, rb) & MASK32(mb, me);
goto logical_done;
case 24: /* ori */
op->val = regs->gpr[rd] | (unsigned short) instr;
goto logical_done_nocc;
case 25: /* oris */
imm = (unsigned short) instr;
op->val = regs->gpr[rd] | (imm << 16);
goto logical_done_nocc;
case 26: /* xori */
op->val = regs->gpr[rd] ^ (unsigned short) instr;
goto logical_done_nocc;
case 27: /* xoris */
imm = (unsigned short) instr;
op->val = regs->gpr[rd] ^ (imm << 16);
goto logical_done_nocc;
case 28: /* andi. */
op->val = regs->gpr[rd] & (unsigned short) instr;
set_cr0(regs, op, ra);
goto logical_done_nocc;
case 29: /* andis. */
imm = (unsigned short) instr;
op->val = regs->gpr[rd] & (imm << 16);
set_cr0(regs, op, ra);
goto logical_done_nocc;
#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 */
val &= MASK64_L(mb);
break;
case 1: /* rldicr */
val &= MASK64_R(mb);
break;
case 2: /* rldic */
val &= MASK64(mb, 63 - sh);
break;
case 3: /* rldimi */
imm = MASK64(mb, 63 - sh);
val = (regs->gpr[ra] & ~imm) |
(val & imm);
}
op->val = val;
goto logical_done;
} else {
sh = regs->gpr[rb] & 0x3f;
val = ROTATE(val, sh);
switch ((instr >> 1) & 7) {
case 0: /* rldcl */
op->val = val & MASK64_L(mb);
goto logical_done;
case 1: /* rldcr */
op->val = val & MASK64_R(mb);
goto logical_done;
}
}
#endif
op->type = UNKNOWN; /* illegal instruction */
return 0;
case 31:
/* isel occupies 32 minor opcodes */
if (((instr >> 1) & 0x1f) == 15) {
mb = (instr >> 6) & 0x1f; /* bc field */
val = (regs->ccr >> (31 - mb)) & 1;
val2 = (ra) ? regs->gpr[ra] : 0;
op->val = (val) ? val2 : regs->gpr[rb];
goto compute_done;
}
switch ((instr >> 1) & 0x3ff) {
case 4: /* tw */
if (rd == 0x1f ||
(rd & trap_compare((int)regs->gpr[ra],
(int)regs->gpr[rb])))
goto trap;
return 1;
#ifdef __powerpc64__
case 68: /* td */
if (rd & trap_compare(regs->gpr[ra], regs->gpr[rb]))
goto trap;
return 1;
#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 */
imm = 0xffffffffUL;
if ((instr >> 20) & 1) {
imm = 0xf0000000UL;
for (sh = 0; sh < 8; ++sh) {
if (instr & (0x80000 >> sh))
break;
imm >>= 4;
}
}
op->val = regs->ccr & imm;
goto compute_done;
case 144: /* mtcrf */
op->type = COMPUTE + SETCC;
imm = 0xf0000000UL;
val = regs->gpr[rd];
op->val = regs->ccr;
for (sh = 0; sh < 8; ++sh) {
if (instr & (0x80000 >> sh))
op->val = (op->val & ~imm) |
(val & imm);
imm >>= 4;
}
return 1;
case 339: /* mfspr */
spr = ((instr >> 16) & 0x1f) | ((instr >> 6) & 0x3e0);
op->type = MFSPR;
op->reg = rd;
op->spr = spr;
if (spr == SPRN_XER || spr == SPRN_LR ||
spr == SPRN_CTR)
return 1;
return 0;
case 467: /* mtspr */
spr = ((instr >> 16) & 0x1f) | ((instr >> 6) & 0x3e0);
op->type = MTSPR;
op->val = regs->gpr[rd];
op->spr = spr;
if (spr == SPRN_XER || spr == SPRN_LR ||
spr == SPRN_CTR)
return 1;
return 0;
/*
* 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, op, val, val2, rd >> 2);
return 1;
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, op, val, val2, rd >> 2);
return 1;
case 508: /* cmpb */
do_cmpb(regs, op, regs->gpr[rd], regs->gpr[rb]);
goto logical_done_nocc;
/*
* Arithmetic instructions
*/
case 8: /* subfc */
add_with_carry(regs, op, rd, ~regs->gpr[ra],
regs->gpr[rb], 1);
goto arith_done;
#ifdef __powerpc64__
case 9: /* mulhdu */
asm("mulhdu %0,%1,%2" : "=r" (op->val) :
"r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
goto arith_done;
#endif
case 10: /* addc */
add_with_carry(regs, op, rd, regs->gpr[ra],
regs->gpr[rb], 0);
goto arith_done;
case 11: /* mulhwu */
asm("mulhwu %0,%1,%2" : "=r" (op->val) :
"r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
goto arith_done;
case 40: /* subf */
op->val = regs->gpr[rb] - regs->gpr[ra];
goto arith_done;
#ifdef __powerpc64__
case 73: /* mulhd */
asm("mulhd %0,%1,%2" : "=r" (op->val) :
"r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
goto arith_done;
#endif
case 75: /* mulhw */
asm("mulhw %0,%1,%2" : "=r" (op->val) :
"r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
goto arith_done;
case 104: /* neg */
op->val = -regs->gpr[ra];
goto arith_done;
case 136: /* subfe */
add_with_carry(regs, op, rd, ~regs->gpr[ra],
regs->gpr[rb], regs->xer & XER_CA);
goto arith_done;
case 138: /* adde */
add_with_carry(regs, op, rd, regs->gpr[ra],
regs->gpr[rb], regs->xer & XER_CA);
goto arith_done;
case 200: /* subfze */
add_with_carry(regs, op, rd, ~regs->gpr[ra], 0L,
regs->xer & XER_CA);
goto arith_done;
case 202: /* addze */
add_with_carry(regs, op, rd, regs->gpr[ra], 0L,
regs->xer & XER_CA);
goto arith_done;
case 232: /* subfme */
add_with_carry(regs, op, rd, ~regs->gpr[ra], -1L,
regs->xer & XER_CA);
goto arith_done;
#ifdef __powerpc64__
case 233: /* mulld */
op->val = regs->gpr[ra] * regs->gpr[rb];
goto arith_done;
#endif
case 234: /* addme */
add_with_carry(regs, op, rd, regs->gpr[ra], -1L,
regs->xer & XER_CA);
goto arith_done;
case 235: /* mullw */
op->val = (unsigned int) regs->gpr[ra] *
(unsigned int) regs->gpr[rb];
goto arith_done;
case 266: /* add */
op->val = regs->gpr[ra] + regs->gpr[rb];
goto arith_done;
#ifdef __powerpc64__
case 457: /* divdu */
op->val = regs->gpr[ra] / regs->gpr[rb];
goto arith_done;
#endif
case 459: /* divwu */
op->val = (unsigned int) regs->gpr[ra] /
(unsigned int) regs->gpr[rb];
goto arith_done;
#ifdef __powerpc64__
case 489: /* divd */
op->val = (long int) regs->gpr[ra] /
(long int) regs->gpr[rb];
goto arith_done;
#endif
case 491: /* divw */
op->val = (int) regs->gpr[ra] /
(int) regs->gpr[rb];
goto arith_done;
/*
* Logical instructions
*/
case 26: /* cntlzw */
op->val = __builtin_clz((unsigned int) regs->gpr[rd]);
goto logical_done;
#ifdef __powerpc64__
case 58: /* cntlzd */
op->val = __builtin_clzl(regs->gpr[rd]);
goto logical_done;
#endif
case 28: /* and */
op->val = regs->gpr[rd] & regs->gpr[rb];
goto logical_done;
case 60: /* andc */
op->val = regs->gpr[rd] & ~regs->gpr[rb];
goto logical_done;
case 122: /* popcntb */
do_popcnt(regs, op, regs->gpr[rd], 8);
goto logical_done_nocc;
case 124: /* nor */
op->val = ~(regs->gpr[rd] | regs->gpr[rb]);
goto logical_done;
case 154: /* prtyw */
do_prty(regs, op, regs->gpr[rd], 32);
goto logical_done_nocc;
case 186: /* prtyd */
do_prty(regs, op, regs->gpr[rd], 64);
goto logical_done_nocc;
#ifdef CONFIG_PPC64
case 252: /* bpermd */
do_bpermd(regs, op, regs->gpr[rd], regs->gpr[rb]);
goto logical_done_nocc;
#endif
case 284: /* xor */
op->val = ~(regs->gpr[rd] ^ regs->gpr[rb]);
goto logical_done;
case 316: /* xor */
op->val = regs->gpr[rd] ^ regs->gpr[rb];
goto logical_done;
case 378: /* popcntw */
do_popcnt(regs, op, regs->gpr[rd], 32);
goto logical_done_nocc;
case 412: /* orc */
op->val = regs->gpr[rd] | ~regs->gpr[rb];
goto logical_done;
case 444: /* or */
op->val = regs->gpr[rd] | regs->gpr[rb];
goto logical_done;
case 476: /* nand */
op->val = ~(regs->gpr[rd] & regs->gpr[rb]);
goto logical_done;
#ifdef CONFIG_PPC64
case 506: /* popcntd */
do_popcnt(regs, op, regs->gpr[rd], 64);
goto logical_done_nocc;
#endif
case 922: /* extsh */
op->val = (signed short) regs->gpr[rd];
goto logical_done;
case 954: /* extsb */
op->val = (signed char) regs->gpr[rd];
goto logical_done;
#ifdef __powerpc64__
case 986: /* extsw */
op->val = (signed int) regs->gpr[rd];
goto logical_done;
#endif
/*
* Shift instructions
*/
case 24: /* slw */
sh = regs->gpr[rb] & 0x3f;
if (sh < 32)
op->val = (regs->gpr[rd] << sh) & 0xffffffffUL;
else
op->val = 0;
goto logical_done;
case 536: /* srw */
sh = regs->gpr[rb] & 0x3f;
if (sh < 32)
op->val = (regs->gpr[rd] & 0xffffffffUL) >> sh;
else
op->val = 0;
goto logical_done;
case 792: /* sraw */
op->type = COMPUTE + SETREG + SETXER;
sh = regs->gpr[rb] & 0x3f;
ival = (signed int) regs->gpr[rd];
op->val = ival >> (sh < 32 ? sh : 31);
op->xerval = regs->xer;
if (ival < 0 && (sh >= 32 || (ival & ((1ul << sh) - 1)) != 0))
op->xerval |= XER_CA;
else
op->xerval &= ~XER_CA;
goto logical_done;
case 824: /* srawi */
op->type = COMPUTE + SETREG + SETXER;
sh = rb;
ival = (signed int) regs->gpr[rd];
op->val = ival >> sh;
op->xerval = regs->xer;
if (ival < 0 && (ival & ((1ul << sh) - 1)) != 0)
op->xerval |= XER_CA;
else
op->xerval &= ~XER_CA;
goto logical_done;
#ifdef __powerpc64__
case 27: /* sld */
sh = regs->gpr[rb] & 0x7f;
if (sh < 64)
op->val = regs->gpr[rd] << sh;
else
op->val = 0;
goto logical_done;
case 539: /* srd */
sh = regs->gpr[rb] & 0x7f;
if (sh < 64)
op->val = regs->gpr[rd] >> sh;
else
op->val = 0;
goto logical_done;
case 794: /* srad */
op->type = COMPUTE + SETREG + SETXER;
sh = regs->gpr[rb] & 0x7f;
ival = (signed long int) regs->gpr[rd];
op->val = ival >> (sh < 64 ? sh : 63);
op->xerval = regs->xer;
if (ival < 0 && (sh >= 64 || (ival & ((1ul << sh) - 1)) != 0))
op->xerval |= XER_CA;
else
op->xerval &= ~XER_CA;
goto logical_done;
case 826: /* sradi with sh_5 = 0 */
case 827: /* sradi with sh_5 = 1 */
op->type = COMPUTE + SETREG + SETXER;
sh = rb | ((instr & 2) << 4);
ival = (signed long int) regs->gpr[rd];
op->val = ival >> sh;
op->xerval = regs->xer;
if (ival < 0 && (ival & ((1ul << sh) - 1)) != 0)
op->xerval |= XER_CA;
else
op->xerval &= ~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;
op->vsx_flags = 0;
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 52: /* lbarx */
op->type = MKOP(LARX, 0, 1);
break;
case 694: /* stbcx. */
op->type = MKOP(STCX, 0, 1);
break;
case 116: /* lharx */
op->type = MKOP(LARX, 0, 2);
break;
case 726: /* sthcx. */
op->type = MKOP(STCX, 0, 2);
break;
case 276: /* lqarx */
if (!((rd & 1) || rd == ra || rd == rb))
op->type = MKOP(LARX, 0, 16);
break;
case 182: /* stqcx. */
if (!(rd & 1))
op->type = MKOP(STCX, 0, 16);
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 */
op->type = MKOP(LOAD_VMX, 0, 16);
op->element_size = 16;
break;
case 231: /* stvx */
case 487: /* stvxl */
op->type = MKOP(STORE_VMX, 0, 16);
break;
#endif /* CONFIG_ALTIVEC */
#ifdef __powerpc64__
case 21: /* ldx */
case 53: /* ldux */
op->type = MKOP(LOAD, u, 8);
break;
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 = ra ? regs->gpr[ra] : 0;
break;
#ifdef CONFIG_PPC_FPU
case 535: /* lfsx */
case 567: /* lfsux */
op->type = MKOP(LOAD_FP, u, 4);
break;
case 599: /* lfdx */
case 631: /* lfdux */
op->type = MKOP(LOAD_FP, u, 8);
break;
case 663: /* stfsx */
case 695: /* stfsux */
op->type = MKOP(STORE_FP, u, 4);
break;
case 727: /* stfdx */
case 759: /* stfdux */
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 = ra ? regs->gpr[ra] : 0;
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 12: /* lxsiwzx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, 0, 4);
op->element_size = 8;
break;
case 76: /* lxsiwax */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, SIGNEXT, 4);
op->element_size = 8;
break;
case 140: /* stxsiwx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(STORE_VSX, 0, 4);
op->element_size = 8;
break;
case 268: /* lxvx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, 0, 16);
op->element_size = 16;
op->vsx_flags = VSX_CHECK_VEC;
break;
case 269: /* lxvl */
case 301: { /* lxvll */
int nb;
op->reg = rd | ((instr & 1) << 5);
op->ea = ra ? regs->gpr[ra] : 0;
nb = regs->gpr[rb] & 0xff;
if (nb > 16)
nb = 16;
op->type = MKOP(LOAD_VSX, 0, nb);
op->element_size = 16;
op->vsx_flags = ((instr & 0x20) ? VSX_LDLEFT : 0) |
VSX_CHECK_VEC;
break;
}
case 332: /* lxvdsx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, 0, 8);
op->element_size = 8;
op->vsx_flags = VSX_SPLAT;
break;
case 364: /* lxvwsx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, 0, 4);
op->element_size = 4;
op->vsx_flags = VSX_SPLAT | VSX_CHECK_VEC;
break;
case 396: /* stxvx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(STORE_VSX, 0, 16);
op->element_size = 16;
op->vsx_flags = VSX_CHECK_VEC;
break;
case 397: /* stxvl */
case 429: { /* stxvll */
int nb;
op->reg = rd | ((instr & 1) << 5);
op->ea = ra ? regs->gpr[ra] : 0;
nb = regs->gpr[rb] & 0xff;
if (nb > 16)
nb = 16;
op->type = MKOP(STORE_VSX, 0, nb);
op->element_size = 16;
op->vsx_flags = ((instr & 0x20) ? VSX_LDLEFT : 0) |
VSX_CHECK_VEC;
break;
}
case 524: /* lxsspx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, 0, 4);
op->element_size = 8;
op->vsx_flags = VSX_FPCONV;
break;
case 588: /* lxsdx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, 0, 8);
op->element_size = 8;
break;
case 652: /* stxsspx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(STORE_VSX, 0, 4);
op->element_size = 8;
op->vsx_flags = VSX_FPCONV;
break;
case 716: /* stxsdx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(STORE_VSX, 0, 8);
op->element_size = 8;
break;
case 780: /* lxvw4x */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, 0, 16);
op->element_size = 4;
break;
case 781: /* lxsibzx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, 0, 1);
op->element_size = 8;
op->vsx_flags = VSX_CHECK_VEC;
break;
case 812: /* lxvh8x */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, 0, 16);
op->element_size = 2;
op->vsx_flags = VSX_CHECK_VEC;
break;
case 813: /* lxsihzx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, 0, 2);
op->element_size = 8;
op->vsx_flags = VSX_CHECK_VEC;
break;
case 844: /* lxvd2x */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, 0, 16);
op->element_size = 8;
break;
case 876: /* lxvb16x */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(LOAD_VSX, 0, 16);
op->element_size = 1;
op->vsx_flags = VSX_CHECK_VEC;
break;
case 908: /* stxvw4x */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(STORE_VSX, 0, 16);
op->element_size = 4;
break;
case 909: /* stxsibx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(STORE_VSX, 0, 1);
op->element_size = 8;
op->vsx_flags = VSX_CHECK_VEC;
break;
case 940: /* stxvh8x */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(STORE_VSX, 0, 16);
op->element_size = 2;
op->vsx_flags = VSX_CHECK_VEC;
break;
case 941: /* stxsihx */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(STORE_VSX, 0, 2);
op->element_size = 8;
op->vsx_flags = VSX_CHECK_VEC;
break;
case 972: /* stxvd2x */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(STORE_VSX, 0, 16);
op->element_size = 8;
break;
case 1004: /* stxvb16x */
op->reg = rd | ((instr & 1) << 5);
op->type = MKOP(STORE_VSX, 0, 16);
op->element_size = 1;
op->vsx_flags = VSX_CHECK_VEC;
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 */
op->type = MKOP(LOAD_FP, u, 4);
op->ea = dform_ea(instr, regs);
break;
case 50: /* lfd */
case 51: /* lfdu */
op->type = MKOP(LOAD_FP, u, 8);
op->ea = dform_ea(instr, regs);
break;
case 52: /* stfs */
case 53: /* stfsu */
op->type = MKOP(STORE_FP, u, 4);
op->ea = dform_ea(instr, regs);
break;
case 54: /* stfd */
case 55: /* stfdu */
op->type = MKOP(STORE_FP, u, 8);
op->ea = dform_ea(instr, regs);
break;
#endif
#ifdef __powerpc64__
case 56: /* lq */
if (!((rd & 1) || (rd == ra)))
op->type = MKOP(LOAD, 0, 16);
op->ea = dqform_ea(instr, regs);
break;
#endif
#ifdef CONFIG_VSX
case 57: /* lxsd, lxssp */
op->ea = dsform_ea(instr, regs);
switch (instr & 3) {
case 2: /* lxsd */
op->reg = rd + 32;
op->type = MKOP(LOAD_VSX, 0, 8);
op->element_size = 8;
op->vsx_flags = VSX_CHECK_VEC;
break;
case 3: /* lxssp */
op->reg = rd + 32;
op->type = MKOP(LOAD_VSX, 0, 4);
op->element_size = 8;
op->vsx_flags = VSX_FPCONV | VSX_CHECK_VEC;
break;
}
break;
#endif /* CONFIG_VSX */
#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;
#endif
#ifdef CONFIG_VSX
case 61: /* lxv, stxsd, stxssp, stxv */
switch (instr & 7) {
case 1: /* lxv */
op->ea = dqform_ea(instr, regs);
if (instr & 8)
op->reg = rd + 32;
op->type = MKOP(LOAD_VSX, 0, 16);
op->element_size = 16;
op->vsx_flags = VSX_CHECK_VEC;
break;
case 2: /* stxsd with LSB of DS field = 0 */
case 6: /* stxsd with LSB of DS field = 1 */
op->ea = dsform_ea(instr, regs);
op->reg = rd + 32;
op->type = MKOP(STORE_VSX, 0, 8);
op->element_size = 8;
op->vsx_flags = VSX_CHECK_VEC;
break;
case 3: /* stxssp with LSB of DS field = 0 */
case 7: /* stxssp with LSB of DS field = 1 */
op->ea = dsform_ea(instr, regs);
op->reg = rd + 32;
op->type = MKOP(STORE_VSX, 0, 4);
op->element_size = 8;
op->vsx_flags = VSX_FPCONV | VSX_CHECK_VEC;
break;
case 5: /* stxv */
op->ea = dqform_ea(instr, regs);
if (instr & 8)
op->reg = rd + 32;
op->type = MKOP(STORE_VSX, 0, 16);
op->element_size = 16;
op->vsx_flags = VSX_CHECK_VEC;
break;
}
break;
#endif /* CONFIG_VSX */
#ifdef __powerpc64__
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;
case 2: /* stq */
if (!(rd & 1))
op->type = MKOP(STORE, 0, 16);
break;
}
break;
#endif /* __powerpc64__ */
}
return 0;
logical_done:
if (instr & 1)
set_cr0(regs, op, ra);
logical_done_nocc:
op->reg = ra;
op->type |= SETREG;
return 1;
arith_done:
if (instr & 1)
set_cr0(regs, op, rd);
compute_done:
op->reg = rd;
op->type |= SETREG;
return 1;
priv:
op->type = INTERRUPT | 0x700;
op->val = SRR1_PROGPRIV;
return 0;
trap:
op->type = INTERRUPT | 0x700;
op->val = SRR1_PROGTRAP;
return 0;
}
EXPORT_SYMBOL_GPL(analyse_instr);
NOKPROBE_SYMBOL(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 nokprobe_inline 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 nokprobe_inline 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 nokprobe_inline 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 an instruction that can be executed just by updating
* fields in *regs.
*/
void emulate_update_regs(struct pt_regs *regs, struct instruction_op *op)
{
unsigned long next_pc;
next_pc = truncate_if_32bit(regs->msr, regs->nip + 4);
switch (op->type & INSTR_TYPE_MASK) {
case COMPUTE:
if (op->type & SETREG)
regs->gpr[op->reg] = op->val;
if (op->type & SETCC)
regs->ccr = op->ccval;
if (op->type & SETXER)
regs->xer = op->xerval;
break;
case BRANCH:
if (op->type & SETLK)
regs->link = next_pc;
if (op->type & BRTAKEN)
next_pc = op->val;
if (op->type & DECCTR)
--regs->ctr;
break;
case BARRIER:
switch (op->type & BARRIER_MASK) {
case BARRIER_SYNC:
mb();
break;
case BARRIER_ISYNC:
isync();
break;
case BARRIER_EIEIO:
eieio();
break;
case BARRIER_LWSYNC:
asm volatile("lwsync" : : : "memory");
break;
case BARRIER_PTESYNC:
asm volatile("ptesync" : : : "memory");
break;
}
break;
case MFSPR:
switch (op->spr) {
case SPRN_XER:
regs->gpr[op->reg] = regs->xer & 0xffffffffUL;
break;
case SPRN_LR:
regs->gpr[op->reg] = regs->link;
break;
case SPRN_CTR:
regs->gpr[op->reg] = regs->ctr;
break;
default:
WARN_ON_ONCE(1);
}
break;
case MTSPR:
switch (op->spr) {
case SPRN_XER:
regs->xer = op->val & 0xffffffffUL;
break;
case SPRN_LR:
regs->link = op->val;
break;
case SPRN_CTR:
regs->ctr = op->val;
break;
default:
WARN_ON_ONCE(1);
}
break;
default:
WARN_ON_ONCE(1);
}
regs->nip = next_pc;
}
/*
* 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 emulate_step(struct pt_regs *regs, unsigned int instr)
{
struct instruction_op op;
int r, err, size, type;
unsigned long val;
unsigned int cr;
int i, rd, nb;
unsigned long ea;
r = analyse_instr(&op, regs, instr);
if (r < 0)
return r;
if (r > 0) {
emulate_update_regs(regs, &op);
return 1;
}
err = 0;
size = GETSIZE(op.type);
type = op.type & INSTR_TYPE_MASK;
ea = op.ea;
if (OP_IS_LOAD_STORE(type) || type == CACHEOP)
ea = truncate_if_32bit(regs->msr, op.ea);
switch (type) {
case CACHEOP:
if (!address_ok(regs, ea, 8))
return 0;
switch (op.type & CACHEOP_MASK) {
case DCBST:
__cacheop_user_asmx(ea, err, "dcbst");
break;
case DCBF:
__cacheop_user_asmx(ea, err, "dcbf");
break;
case DCBTST:
if (op.reg == 0)
prefetchw((void *) ea);
break;
case DCBT:
if (op.reg == 0)
prefetch((void *) ea);
break;
case ICBI:
__cacheop_user_asmx(ea, err, "icbi");
break;
}
if (err)
return 0;
goto instr_done;
case LARX:
if (ea & (size - 1))
break; /* can't handle misaligned */
if (!address_ok(regs, ea, size))
return 0;
err = 0;
switch (size) {
#ifdef __powerpc64__
case 1:
__get_user_asmx(val, ea, err, "lbarx");
break;
case 2:
__get_user_asmx(val, ea, err, "lharx");
break;
#endif
case 4:
__get_user_asmx(val, ea, err, "lwarx");
break;
#ifdef __powerpc64__
case 8:
__get_user_asmx(val, ea, err, "ldarx");
break;
case 16:
err = do_lqarx(ea, &regs->gpr[op.reg]);
goto ldst_done;
#endif
default:
return 0;
}
if (!err)
regs->gpr[op.reg] = val;
goto ldst_done;
case STCX:
if (ea & (size - 1))
break; /* can't handle misaligned */
if (!address_ok(regs, ea, size))
return 0;
err = 0;
switch (size) {
#ifdef __powerpc64__
case 1:
__put_user_asmx(op.val, ea, err, "stbcx.", cr);
break;
case 2:
__put_user_asmx(op.val, ea, err, "stbcx.", cr);
break;
#endif
case 4:
__put_user_asmx(op.val, ea, err, "stwcx.", cr);
break;
#ifdef __powerpc64__
case 8:
__put_user_asmx(op.val, ea, err, "stdcx.", cr);
break;
case 16:
err = do_stqcx(ea, regs->gpr[op.reg],
regs->gpr[op.reg + 1], &cr);
break;
#endif
default:
return 0;
}
if (!err)
regs->ccr = (regs->ccr & 0x0fffffff) |
(cr & 0xe0000000) |
((regs->xer >> 3) & 0x10000000);
goto ldst_done;
case LOAD:
#ifdef __powerpc64__
if (size == 16) {
err = emulate_lq(regs, ea, op.reg);
goto ldst_done;
}
#endif
err = read_mem(&regs->gpr[op.reg], 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_FP))
return 0;
if (size == 4)
err = do_fp_load(op.reg, do_lfs, ea, size, regs);
else
err = do_fp_load(op.reg, do_lfd, ea, size, regs);
goto ldst_done;
#endif
#ifdef CONFIG_ALTIVEC
case LOAD_VMX:
if (!(regs->msr & MSR_VEC))
return 0;
err = do_vec_load(op.reg, do_lvx, ea, regs);
goto ldst_done;
#endif
#ifdef CONFIG_VSX
case LOAD_VSX: {
u8 mem[16];
union vsx_reg buf;
unsigned long msrbit = MSR_VSX;
/*
* Some VSX instructions check the MSR_VEC bit rather than MSR_VSX
* when the target of the instruction is a vector register.
*/
if (op.reg >= 32 && (op.vsx_flags & VSX_CHECK_VEC))
msrbit = MSR_VEC;
if (!(regs->msr & msrbit))
return 0;
if (!address_ok(regs, ea, size) ||
copy_mem_in(mem, ea, size))
return 0;
emulate_vsx_load(&op, &buf, mem);
load_vsrn(op.reg, &buf);
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], ea, nb, regs);
if (err)
return 0;
if (nb < 4) /* left-justify last bytes */
regs->gpr[rd] <<= 32 - 8 * nb;
ea += 4;
++rd;
}
goto instr_done;
case STORE:
#ifdef __powerpc64__
if (size == 16) {
err = emulate_stq(regs, ea, op.reg);
goto ldst_done;
}
#endif
if ((op.type & UPDATE) && size == sizeof(long) &&
op.reg == 1 && op.update_reg == 1 &&
!(regs->msr & MSR_PR) &&
ea >= regs->gpr[1] - STACK_INT_FRAME_SIZE) {
err = handle_stack_update(ea, regs);
goto ldst_done;
}
err = write_mem(op.val, ea, size, regs);
goto ldst_done;
#ifdef CONFIG_PPC_FPU
case STORE_FP:
if (!(regs->msr & MSR_FP))
return 0;
if (size == 4)
err = do_fp_store(op.reg, do_stfs, ea, size, regs);
else
err = do_fp_store(op.reg, do_stfd, ea, size, regs);
goto ldst_done;
#endif
#ifdef CONFIG_ALTIVEC
case STORE_VMX:
if (!(regs->msr & MSR_VEC))
return 0;
err = do_vec_store(op.reg, do_stvx, ea, regs);
goto ldst_done;
#endif
#ifdef CONFIG_VSX
case STORE_VSX: {
u8 mem[16];
union vsx_reg buf;
unsigned long msrbit = MSR_VSX;
/*
* Some VSX instructions check the MSR_VEC bit rather than MSR_VSX
* when the target of the instruction is a vector register.
*/
if (op.reg >= 32 && (op.vsx_flags & VSX_CHECK_VEC))
msrbit = MSR_VEC;
if (!(regs->msr & msrbit))
return 0;
if (!address_ok(regs, ea, size))
return 0;
store_vsrn(op.reg, &buf);
emulate_vsx_store(&op, &buf, mem);
if (copy_mem_out(mem, ea, size))
return 0;
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, ea, nb, regs);
if (err)
return 0;
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;
}
NOKPROBE_SYMBOL(emulate_step);
View Git Blame Copy Permalink