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Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/lib/sstep.c | 3502 |
1 files changed, 3502 insertions, 0 deletions
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c new file mode 100644 index 000000000..2d1965532 --- /dev/null +++ b/arch/powerpc/lib/sstep.c @@ -0,0 +1,3502 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Single-step support. + * + * Copyright (C) 2004 Paul Mackerras <paulus@au.ibm.com>, IBM + */ +#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> +#include <asm/disassemble.h> + +extern char system_call_common[]; +extern char system_call_vectored_emulate[]; + +#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 +#define XER_OV32 0x00080000U +#define XER_CA32 0x00040000U + +#ifdef CONFIG_PPC_FPU +/* + * Functions in ldstfp.S + */ +extern void get_fpr(int rn, double *p); +extern void put_fpr(int rn, const double *p); +extern void get_vr(int rn, __vector128 *p); +extern void put_vr(int rn, __vector128 *p); +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; + if (access_ok((void __user *)ea, nb)) + return 1; + if (access_ok((void __user *)ea, 1)) + /* Access overlaps the end of the user region */ + regs->dar = TASK_SIZE_MAX - 1; + else + regs->dar = ea; + return 0; +} + +/* + * 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; +} + +/* + * Calculate effective address for a MLS:D-form / 8LS:D-form + * prefixed instruction + */ +static nokprobe_inline unsigned long mlsd_8lsd_ea(unsigned int instr, + unsigned int suffix, + const struct pt_regs *regs) +{ + int ra, prefix_r; + unsigned int dd; + unsigned long ea, d0, d1, d; + + prefix_r = GET_PREFIX_R(instr); + ra = GET_PREFIX_RA(suffix); + + d0 = instr & 0x3ffff; + d1 = suffix & 0xffff; + d = (d0 << 16) | d1; + + /* + * sign extend a 34 bit number + */ + dd = (unsigned int)(d >> 2); + ea = (signed int)dd; + ea = (ea << 2) | (d & 0x3); + + if (!prefix_r && ra) + ea += regs->gpr[ra]; + else if (!prefix_r && !ra) + ; /* Leave ea as is */ + else if (prefix_r) + ea += regs->nip; + + /* + * (prefix_r && ra) is an invalid form. Should already be + * checked for by caller! + */ + + 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 void do_byte_reverse(void *ptr, int nb) +{ + switch (nb) { + case 2: + *(u16 *)ptr = byterev_2(*(u16 *)ptr); + break; + case 4: + *(u32 *)ptr = byterev_4(*(u32 *)ptr); + break; +#ifdef __powerpc64__ + case 8: + *(unsigned long *)ptr = byterev_8(*(unsigned long *)ptr); + break; + case 16: { + unsigned long *up = (unsigned long *)ptr; + unsigned long tmp; + tmp = byterev_8(up[0]); + up[0] = byterev_8(up[1]); + up[1] = tmp; + break; + } +#endif + default: + WARN_ON_ONCE(1); + } +} + +static nokprobe_inline int read_mem_aligned(unsigned long *dest, + unsigned long ea, int nb, + struct pt_regs *regs) +{ + 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; + else + regs->dar = ea; + return err; +} + +/* + * Copy from userspace to a buffer, using the largest possible + * aligned accesses, up to sizeof(long). + */ +static nokprobe_inline int copy_mem_in(u8 *dest, unsigned long ea, int nb, + struct pt_regs *regs) +{ + 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) { + regs->dar = ea; + 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, regs); + 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, regs); + 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, + struct pt_regs *regs) +{ + 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 + } + if (err) + regs->dar = ea; + return err; +} + +/* + * Copy from a buffer to userspace, using the largest possible + * aligned accesses, up to sizeof(long). + */ +static nokprobe_inline int copy_mem_out(u8 *dest, unsigned long ea, int nb, + struct pt_regs *regs) +{ + 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) { + regs->dar = ea; + 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, regs); +} + +/* + * 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, regs); + return write_mem_unaligned(val, ea, nb, regs); +} +NOKPROBE_SYMBOL(write_mem); + +#ifdef CONFIG_PPC_FPU +/* + * These access either the real FP register or the image in the + * thread_struct, depending on regs->msr & MSR_FP. + */ +static int do_fp_load(struct instruction_op *op, unsigned long ea, + struct pt_regs *regs, bool cross_endian) +{ + int err, rn, nb; + union { + int i; + unsigned int u; + float f; + double d[2]; + unsigned long l[2]; + u8 b[2 * sizeof(double)]; + } u; + + nb = GETSIZE(op->type); + if (!address_ok(regs, ea, nb)) + return -EFAULT; + rn = op->reg; + err = copy_mem_in(u.b, ea, nb, regs); + if (err) + return err; + if (unlikely(cross_endian)) { + do_byte_reverse(u.b, min(nb, 8)); + if (nb == 16) + do_byte_reverse(&u.b[8], 8); + } + preempt_disable(); + if (nb == 4) { + if (op->type & FPCONV) + conv_sp_to_dp(&u.f, &u.d[0]); + else if (op->type & SIGNEXT) + u.l[0] = u.i; + else + u.l[0] = u.u; + } + if (regs->msr & MSR_FP) + put_fpr(rn, &u.d[0]); + else + current->thread.TS_FPR(rn) = u.l[0]; + if (nb == 16) { + /* lfdp */ + rn |= 1; + if (regs->msr & MSR_FP) + put_fpr(rn, &u.d[1]); + else + current->thread.TS_FPR(rn) = u.l[1]; + } + preempt_enable(); + return 0; +} +NOKPROBE_SYMBOL(do_fp_load); + +static int do_fp_store(struct instruction_op *op, unsigned long ea, + struct pt_regs *regs, bool cross_endian) +{ + int rn, nb; + union { + unsigned int u; + float f; + double d[2]; + unsigned long l[2]; + u8 b[2 * sizeof(double)]; + } u; + + nb = GETSIZE(op->type); + if (!address_ok(regs, ea, nb)) + return -EFAULT; + rn = op->reg; + preempt_disable(); + if (regs->msr & MSR_FP) + get_fpr(rn, &u.d[0]); + else + u.l[0] = current->thread.TS_FPR(rn); + if (nb == 4) { + if (op->type & FPCONV) + conv_dp_to_sp(&u.d[0], &u.f); + else + u.u = u.l[0]; + } + if (nb == 16) { + rn |= 1; + if (regs->msr & MSR_FP) + get_fpr(rn, &u.d[1]); + else + u.l[1] = current->thread.TS_FPR(rn); + } + preempt_enable(); + if (unlikely(cross_endian)) { + do_byte_reverse(u.b, min(nb, 8)); + if (nb == 16) + do_byte_reverse(&u.b[8], 8); + } + return copy_mem_out(u.b, ea, nb, regs); +} +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, unsigned long ea, + int size, struct pt_regs *regs, + bool cross_endian) +{ + int err; + union { + __vector128 v; + u8 b[sizeof(__vector128)]; + } u = {}; + + if (!address_ok(regs, ea & ~0xfUL, 16)) + return -EFAULT; + /* align to multiple of size */ + ea &= ~(size - 1); + err = copy_mem_in(&u.b[ea & 0xf], ea, size, regs); + if (err) + return err; + if (unlikely(cross_endian)) + do_byte_reverse(&u.b[ea & 0xf], size); + preempt_disable(); + if (regs->msr & MSR_VEC) + put_vr(rn, &u.v); + else + current->thread.vr_state.vr[rn] = u.v; + preempt_enable(); + return 0; +} + +static nokprobe_inline int do_vec_store(int rn, unsigned long ea, + int size, struct pt_regs *regs, + bool cross_endian) +{ + union { + __vector128 v; + u8 b[sizeof(__vector128)]; + } u; + + if (!address_ok(regs, ea & ~0xfUL, 16)) + return -EFAULT; + /* align to multiple of size */ + ea &= ~(size - 1); + + preempt_disable(); + if (regs->msr & MSR_VEC) + get_vr(rn, &u.v); + else + u.v = current->thread.vr_state.vr[rn]; + preempt_enable(); + if (unlikely(cross_endian)) + do_byte_reverse(&u.b[ea & 0xf], size); + return copy_mem_out(&u.b[ea & 0xf], ea, size, regs); +} +#endif /* CONFIG_ALTIVEC */ + +#ifdef __powerpc64__ +static nokprobe_inline int emulate_lq(struct pt_regs *regs, unsigned long ea, + int reg, bool cross_endian) +{ + int err; + + if (!address_ok(regs, ea, 16)) + return -EFAULT; + /* if aligned, should be atomic */ + if ((ea & 0xf) == 0) { + err = do_lq(ea, ®s->gpr[reg]); + } else { + err = read_mem(®s->gpr[reg + IS_LE], ea, 8, regs); + if (!err) + err = read_mem(®s->gpr[reg + IS_BE], ea + 8, 8, regs); + } + if (!err && unlikely(cross_endian)) + do_byte_reverse(®s->gpr[reg], 16); + return err; +} + +static nokprobe_inline int emulate_stq(struct pt_regs *regs, unsigned long ea, + int reg, bool cross_endian) +{ + int err; + unsigned long vals[2]; + + if (!address_ok(regs, ea, 16)) + return -EFAULT; + vals[0] = regs->gpr[reg]; + vals[1] = regs->gpr[reg + 1]; + if (unlikely(cross_endian)) + do_byte_reverse(vals, 16); + + /* if aligned, should be atomic */ + if ((ea & 0xf) == 0) + return do_stq(ea, vals[0], vals[1]); + + err = write_mem(vals[IS_LE], ea, 8, regs); + if (!err) + err = write_mem(vals[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, bool rev) +{ + 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)) + rev = !rev; + if (rev) + do_byte_reverse(reg, 16); + break; + case 8: + /* scalar loads, lxvd2x, lxvdsx */ + read_size = (size >= 8) ? 8 : size; + i = IS_LE ? 8 : 8 - read_size; + memcpy(®->b[i], mem, read_size); + if (rev) + do_byte_reverse(®->b[i], 8); + 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(®->fp[1 + IS_LE], + ®->dp[IS_LE]); + preempt_enable(); + } + } else { + if (size == 16) { + unsigned long v = *(unsigned long *)(mem + 8); + reg->d[IS_BE] = !rev ? v : byterev_8(v); + } 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] = !rev ? *wp++ : byterev_4(*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] = !rev ? *hp++ : byterev_2(*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, bool rev) +{ + 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)) + rev = !rev; + if (rev) { + /* 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(®->dp[IS_LE], &buf.fp[1 + IS_LE]); + preempt_enable(); + reg = &buf; + } + memcpy(mem, ®->b[i], write_size); + if (size == 16) + memcpy(mem + 8, ®->d[IS_BE], 8); + if (unlikely(rev)) { + do_byte_reverse(mem, write_size); + if (size == 16) + do_byte_reverse(mem + 8, 8); + } + break; + case 4: + /* stxvw4x */ + wp = mem; + for (j = 0; j < size / 4; ++j) { + i = IS_LE ? 3 - j : j; + *wp++ = !rev ? reg->w[i] : byterev_4(reg->w[i]); + } + break; + case 2: + /* stxvh8x */ + hp = mem; + for (j = 0; j < size / 2; ++j) { + i = IS_LE ? 7 - j : j; + *hp++ = !rev ? reg->h[i] : byterev_2(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); + +static nokprobe_inline int do_vsx_load(struct instruction_op *op, + unsigned long ea, struct pt_regs *regs, + bool cross_endian) +{ + int reg = op->reg; + u8 mem[16]; + union vsx_reg buf; + int size = GETSIZE(op->type); + + if (!address_ok(regs, ea, size) || copy_mem_in(mem, ea, size, regs)) + return -EFAULT; + + emulate_vsx_load(op, &buf, mem, cross_endian); + preempt_disable(); + if (reg < 32) { + /* FP regs + extensions */ + if (regs->msr & MSR_FP) { + load_vsrn(reg, &buf); + } else { + current->thread.fp_state.fpr[reg][0] = buf.d[0]; + current->thread.fp_state.fpr[reg][1] = buf.d[1]; + } + } else { + if (regs->msr & MSR_VEC) + load_vsrn(reg, &buf); + else + current->thread.vr_state.vr[reg - 32] = buf.v; + } + preempt_enable(); + return 0; +} + +static nokprobe_inline int do_vsx_store(struct instruction_op *op, + unsigned long ea, struct pt_regs *regs, + bool cross_endian) +{ + int reg = op->reg; + u8 mem[16]; + union vsx_reg buf; + int size = GETSIZE(op->type); + + if (!address_ok(regs, ea, size)) + return -EFAULT; + + preempt_disable(); + if (reg < 32) { + /* FP regs + extensions */ + if (regs->msr & MSR_FP) { + store_vsrn(reg, &buf); + } else { + buf.d[0] = current->thread.fp_state.fpr[reg][0]; + buf.d[1] = current->thread.fp_state.fpr[reg][1]; + } + } else { + if (regs->msr & MSR_VEC) + store_vsrn(reg, &buf); + else + buf.v = current->thread.vr_state.vr[reg - 32]; + } + preempt_enable(); + emulate_vsx_store(op, &buf, mem, cross_endian); + return copy_mem_out(mem, ea, size, regs); +} +#endif /* CONFIG_VSX */ + +int emulate_dcbz(unsigned long ea, struct pt_regs *regs) +{ + int err; + unsigned long i, size; + +#ifdef __powerpc64__ + size = ppc64_caches.l1d.block_size; + if (!(regs->msr & MSR_64BIT)) + ea &= 0xffffffffUL; +#else + size = L1_CACHE_BYTES; +#endif + ea &= ~(size - 1); + if (!address_ok(regs, ea, size)) + return -EFAULT; + for (i = 0; i < size; i += sizeof(long)) { + err = __put_user(0, (unsigned long __user *) (ea + i)); + if (err) { + regs->dar = ea; + return err; + } + } + return 0; +} +NOKPROBE_SYMBOL(emulate_dcbz); + +#define __put_user_asmx(x, addr, err, op, cr) \ + __asm__ __volatile__( \ + ".machine push\n" \ + ".machine power8\n" \ + "1: " op " %2,0,%3\n" \ + ".machine pop\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__( \ + ".machine push\n" \ + ".machine power8\n" \ + "1: "op" %1,0,%2\n" \ + ".machine pop\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) +{ + long val = op->val; + + 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 set_ca32(struct instruction_op *op, bool val) +{ + if (cpu_has_feature(CPU_FTR_ARCH_300)) { + if (val) + op->xerval |= XER_CA32; + else + op->xerval &= ~XER_CA32; + } +} + +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; + + set_ca32(op, (unsigned int)val < (unsigned int)val1 || + (carry_in && (unsigned int)val == (unsigned int)val1)); +} + +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) & 0x5555555555555555ULL; + out = (0x3333333333333333ULL & out) + + (0x3333333333333333ULL & (out >> 2)); + out = (out + (out >> 4)) & 0x0f0f0f0f0f0f0f0fULL; + + if (size == 8) { /* popcntb */ + op->val = out; + return; + } + out += out >> 8; + out += out >> 16; + if (size == 32) { /* popcntw */ + op->val = out & 0x0000003f0000003fULL; + 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 & 0x0000000100000001ULL; + 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, + struct ppc_inst instr) +{ +#ifdef CONFIG_PPC64 + unsigned int suffixopcode, prefixtype, prefix_r; +#endif + unsigned int opcode, ra, rb, rc, rd, spr, u; + unsigned long int imm; + unsigned long int val, val2; + unsigned int mb, me, sh; + unsigned int word, suffix; + long ival; + + word = ppc_inst_val(instr); + suffix = ppc_inst_suffix(instr); + + op->type = COMPUTE; + + opcode = ppc_inst_primary_opcode(instr); + switch (opcode) { + case 16: /* bc */ + op->type = BRANCH; + imm = (signed short)(word & 0xfffc); + if ((word & 2) == 0) + imm += regs->nip; + op->val = truncate_if_32bit(regs->msr, imm); + if (word & 1) + op->type |= SETLK; + if (branch_taken(word, regs, op)) + op->type |= BRTAKEN; + return 1; +#ifdef CONFIG_PPC64 + case 17: /* sc */ + if ((word & 0xfe2) == 2) + op->type = SYSCALL; + else if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && + (word & 0xfe3) == 1) { /* scv */ + op->type = SYSCALL_VECTORED_0; + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + } else + op->type = UNKNOWN; + return 0; +#endif + case 18: /* b */ + op->type = BRANCH | BRTAKEN; + imm = word & 0x03fffffc; + if (imm & 0x02000000) + imm -= 0x04000000; + if ((word & 2) == 0) + imm += regs->nip; + op->val = truncate_if_32bit(regs->msr, imm); + if (word & 1) + op->type |= SETLK; + return 1; + case 19: + switch ((word >> 1) & 0x3ff) { + case 0: /* mcrf */ + op->type = COMPUTE + SETCC; + rd = 7 - ((word >> 23) & 0x7); + ra = 7 - ((word >> 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 = (word & 0x400)? regs->ctr: regs->link; + op->val = truncate_if_32bit(regs->msr, imm); + if (word & 1) + op->type |= SETLK; + if (branch_taken(word, 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 = (word >> 16) & 0x1f; + rb = (word >> 11) & 0x1f; + rd = (word >> 21) & 0x1f; + ra = (regs->ccr >> (31 - ra)) & 1; + rb = (regs->ccr >> (31 - rb)) & 1; + val = (word >> (6 + ra * 2 + rb)) & 1; + op->ccval = (regs->ccr & ~(1UL << (31 - rd))) | + (val << (31 - rd)); + return 1; + } + break; + case 31: + switch ((word >> 1) & 0x3ff) { + case 598: /* sync */ + op->type = BARRIER + BARRIER_SYNC; +#ifdef __powerpc64__ + switch ((word >> 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 = (word >> 21) & 0x1f; + ra = (word >> 16) & 0x1f; + rb = (word >> 11) & 0x1f; + rc = (word >> 6) & 0x1f; + + switch (opcode) { +#ifdef __powerpc64__ + case 1: + if (!cpu_has_feature(CPU_FTR_ARCH_31)) + goto unknown_opcode; + + prefix_r = GET_PREFIX_R(word); + ra = GET_PREFIX_RA(suffix); + rd = (suffix >> 21) & 0x1f; + op->reg = rd; + op->val = regs->gpr[rd]; + suffixopcode = get_op(suffix); + prefixtype = (word >> 24) & 0x3; + switch (prefixtype) { + case 2: + if (prefix_r && ra) + return 0; + switch (suffixopcode) { + case 14: /* paddi */ + op->type = COMPUTE | PREFIXED; + op->val = mlsd_8lsd_ea(word, suffix, regs); + goto compute_done; + } + } + break; + case 2: /* tdi */ + if (rd & trap_compare(regs->gpr[ra], (short) word)) + goto trap; + return 1; +#endif + case 3: /* twi */ + if (rd & trap_compare((int)regs->gpr[ra], (short) word)) + goto trap; + return 1; + +#ifdef __powerpc64__ + case 4: + /* + * There are very many instructions with this primary opcode + * introduced in the ISA as early as v2.03. However, the ones + * we currently emulate were all introduced with ISA 3.0 + */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + + switch (word & 0x3f) { + case 48: /* maddhd */ + asm volatile(PPC_MADDHD(%0, %1, %2, %3) : + "=r" (op->val) : "r" (regs->gpr[ra]), + "r" (regs->gpr[rb]), "r" (regs->gpr[rc])); + goto compute_done; + + case 49: /* maddhdu */ + asm volatile(PPC_MADDHDU(%0, %1, %2, %3) : + "=r" (op->val) : "r" (regs->gpr[ra]), + "r" (regs->gpr[rb]), "r" (regs->gpr[rc])); + goto compute_done; + + case 51: /* maddld */ + asm volatile(PPC_MADDLD(%0, %1, %2, %3) : + "=r" (op->val) : "r" (regs->gpr[ra]), + "r" (regs->gpr[rb]), "r" (regs->gpr[rc])); + goto compute_done; + } + + /* + * There are other instructions from ISA 3.0 with the same + * primary opcode which do not have emulation support yet. + */ + goto unknown_opcode; +#endif + + case 7: /* mulli */ + op->val = regs->gpr[ra] * (short) word; + goto compute_done; + + case 8: /* subfic */ + imm = (short) word; + add_with_carry(regs, op, rd, ~regs->gpr[ra], imm, 1); + return 1; + + case 10: /* cmpli */ + imm = (unsigned short) word; + 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) word; + 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) word; + add_with_carry(regs, op, rd, regs->gpr[ra], imm, 0); + return 1; + + case 13: /* addic. */ + imm = (short) word; + add_with_carry(regs, op, rd, regs->gpr[ra], imm, 0); + set_cr0(regs, op); + return 1; + + case 14: /* addi */ + imm = (short) word; + if (ra) + imm += regs->gpr[ra]; + op->val = imm; + goto compute_done; + + case 15: /* addis */ + imm = ((short) word) << 16; + if (ra) + imm += regs->gpr[ra]; + op->val = imm; + goto compute_done; + + case 19: + if (((word >> 1) & 0x1f) == 2) { + /* addpcis */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + imm = (short) (word & 0xffc1); /* d0 + d2 fields */ + imm |= (word >> 15) & 0x3e; /* d1 field */ + op->val = regs->nip + (imm << 16) + 4; + goto compute_done; + } + op->type = UNKNOWN; + return 0; + + case 20: /* rlwimi */ + mb = (word >> 6) & 0x1f; + me = (word >> 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 = (word >> 6) & 0x1f; + me = (word >> 1) & 0x1f; + val = DATA32(regs->gpr[rd]); + op->val = ROTATE(val, rb) & MASK32(mb, me); + goto logical_done; + + case 23: /* rlwnm */ + mb = (word >> 6) & 0x1f; + me = (word >> 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) word; + goto logical_done_nocc; + + case 25: /* oris */ + imm = (unsigned short) word; + op->val = regs->gpr[rd] | (imm << 16); + goto logical_done_nocc; + + case 26: /* xori */ + op->val = regs->gpr[rd] ^ (unsigned short) word; + goto logical_done_nocc; + + case 27: /* xoris */ + imm = (unsigned short) word; + op->val = regs->gpr[rd] ^ (imm << 16); + goto logical_done_nocc; + + case 28: /* andi. */ + op->val = regs->gpr[rd] & (unsigned short) word; + set_cr0(regs, op); + goto logical_done_nocc; + + case 29: /* andis. */ + imm = (unsigned short) word; + op->val = regs->gpr[rd] & (imm << 16); + set_cr0(regs, op); + goto logical_done_nocc; + +#ifdef __powerpc64__ + case 30: /* rld* */ + mb = ((word >> 6) & 0x1f) | (word & 0x20); + val = regs->gpr[rd]; + if ((word & 0x10) == 0) { + sh = rb | ((word & 2) << 4); + val = ROTATE(val, sh); + switch ((word >> 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 ((word >> 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 (((word >> 1) & 0x1f) == 15) { + mb = (word >> 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 ((word >> 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 = (word & 0x10000)? 0x8002: 0xefffffffffffeffeUL; + op->val = imm; + return 0; +#endif + + case 19: /* mfcr */ + imm = 0xffffffffUL; + if ((word >> 20) & 1) { + imm = 0xf0000000UL; + for (sh = 0; sh < 8; ++sh) { + if (word & (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->ccval = regs->ccr; + for (sh = 0; sh < 8; ++sh) { + if (word & (0x80000 >> sh)) + op->ccval = (op->ccval & ~imm) | + (val & imm); + imm >>= 4; + } + return 1; + + case 339: /* mfspr */ + spr = ((word >> 16) & 0x1f) | ((word >> 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 = ((word >> 16) & 0x1f) | ((word >> 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 = (long)(int) regs->gpr[ra] * + (int) regs->gpr[rb]; + + goto arith_done; +#ifdef __powerpc64__ + case 265: /* modud */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->val = regs->gpr[ra] % regs->gpr[rb]; + goto compute_done; +#endif + case 266: /* add */ + op->val = regs->gpr[ra] + regs->gpr[rb]; + goto arith_done; + + case 267: /* moduw */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->val = (unsigned int) regs->gpr[ra] % + (unsigned int) regs->gpr[rb]; + goto compute_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; +#ifdef __powerpc64__ + case 425: /* divde[.] */ + asm volatile(PPC_DIVDE(%0, %1, %2) : + "=r" (op->val) : "r" (regs->gpr[ra]), + "r" (regs->gpr[rb])); + goto arith_done; + case 393: /* divdeu[.] */ + asm volatile(PPC_DIVDEU(%0, %1, %2) : + "=r" (op->val) : "r" (regs->gpr[ra]), + "r" (regs->gpr[rb])); + goto arith_done; +#endif + case 755: /* darn */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + switch (ra & 0x3) { + case 0: + /* 32-bit conditioned */ + asm volatile(PPC_DARN(%0, 0) : "=r" (op->val)); + goto compute_done; + + case 1: + /* 64-bit conditioned */ + asm volatile(PPC_DARN(%0, 1) : "=r" (op->val)); + goto compute_done; + + case 2: + /* 64-bit raw */ + asm volatile(PPC_DARN(%0, 2) : "=r" (op->val)); + goto compute_done; + } + + goto unknown_opcode; +#ifdef __powerpc64__ + case 777: /* modsd */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->val = (long int) regs->gpr[ra] % + (long int) regs->gpr[rb]; + goto compute_done; +#endif + case 779: /* modsw */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->val = (int) regs->gpr[ra] % + (int) regs->gpr[rb]; + goto compute_done; + + +/* + * Logical instructions + */ + case 26: /* cntlzw */ + val = (unsigned int) regs->gpr[rd]; + op->val = ( val ? __builtin_clz(val) : 32 ); + goto logical_done; +#ifdef __powerpc64__ + case 58: /* cntlzd */ + val = regs->gpr[rd]; + op->val = ( val ? __builtin_clzl(val) : 64 ); + 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 538: /* cnttzw */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + val = (unsigned int) regs->gpr[rd]; + op->val = (val ? __builtin_ctz(val) : 32); + goto logical_done; +#ifdef __powerpc64__ + case 570: /* cnttzd */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + val = regs->gpr[rd]; + op->val = (val ? __builtin_ctzl(val) : 64); + goto logical_done; +#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; + set_ca32(op, 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; + set_ca32(op, 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; + set_ca32(op, 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 | ((word & 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; + set_ca32(op, op->xerval & XER_CA); + goto logical_done; + + case 890: /* extswsli with sh_5 = 0 */ + case 891: /* extswsli with sh_5 = 1 */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->type = COMPUTE + SETREG; + sh = rb | ((word & 2) << 4); + val = (signed int) regs->gpr[rd]; + if (sh) + op->val = ROTATE(val, sh) & MASK64(0, 63 - sh); + else + op->val = val; + goto logical_done; + +#endif /* __powerpc64__ */ + +/* + * Cache instructions + */ + case 54: /* dcbst */ + op->type = MKOP(CACHEOP, DCBST, 0); + op->ea = xform_ea(word, regs); + return 0; + + case 86: /* dcbf */ + op->type = MKOP(CACHEOP, DCBF, 0); + op->ea = xform_ea(word, regs); + return 0; + + case 246: /* dcbtst */ + op->type = MKOP(CACHEOP, DCBTST, 0); + op->ea = xform_ea(word, regs); + op->reg = rd; + return 0; + + case 278: /* dcbt */ + op->type = MKOP(CACHEOP, DCBTST, 0); + op->ea = xform_ea(word, regs); + op->reg = rd; + return 0; + + case 982: /* icbi */ + op->type = MKOP(CACHEOP, ICBI, 0); + op->ea = xform_ea(word, regs); + return 0; + + case 1014: /* dcbz */ + op->type = MKOP(CACHEOP, DCBZ, 0); + op->ea = xform_ea(word, regs); + return 0; + } + break; + } + +/* + * Loads and stores. + */ + op->type = UNKNOWN; + op->update_reg = ra; + op->reg = rd; + op->val = regs->gpr[rd]; + u = (word >> 20) & UPDATE; + op->vsx_flags = 0; + + switch (opcode) { + case 31: + u = word & UPDATE; + op->ea = xform_ea(word, regs); + switch ((word >> 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 + /* + * Note: for the load/store vector element instructions, + * bits of the EA say which field of the VMX register to use. + */ + case 7: /* lvebx */ + op->type = MKOP(LOAD_VMX, 0, 1); + op->element_size = 1; + break; + + case 39: /* lvehx */ + op->type = MKOP(LOAD_VMX, 0, 2); + op->element_size = 2; + break; + + case 71: /* lvewx */ + op->type = MKOP(LOAD_VMX, 0, 4); + op->element_size = 4; + break; + + case 103: /* lvx */ + case 359: /* lvxl */ + op->type = MKOP(LOAD_VMX, 0, 16); + op->element_size = 16; + break; + + case 135: /* stvebx */ + op->type = MKOP(STORE_VMX, 0, 1); + op->element_size = 1; + break; + + case 167: /* stvehx */ + op->type = MKOP(STORE_VMX, 0, 2); + op->element_size = 2; + break; + + case 199: /* stvewx */ + op->type = MKOP(STORE_VMX, 0, 4); + op->element_size = 4; + 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 | FPCONV, 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 | FPCONV, 4); + break; + + case 727: /* stfdx */ + case 759: /* stfdux */ + op->type = MKOP(STORE_FP, u, 8); + break; + +#ifdef __powerpc64__ + case 791: /* lfdpx */ + op->type = MKOP(LOAD_FP, 0, 16); + break; + + case 855: /* lfiwax */ + op->type = MKOP(LOAD_FP, SIGNEXT, 4); + break; + + case 887: /* lfiwzx */ + op->type = MKOP(LOAD_FP, 0, 4); + break; + + case 919: /* stfdpx */ + op->type = MKOP(STORE_FP, 0, 16); + break; + + case 983: /* stfiwx */ + op->type = MKOP(STORE_FP, 0, 4); + break; +#endif /* __powerpc64 */ +#endif /* CONFIG_PPC_FPU */ + +#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: /* stswi */ + 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 | ((word & 1) << 5); + op->type = MKOP(LOAD_VSX, 0, 4); + op->element_size = 8; + break; + + case 76: /* lxsiwax */ + op->reg = rd | ((word & 1) << 5); + op->type = MKOP(LOAD_VSX, SIGNEXT, 4); + op->element_size = 8; + break; + + case 140: /* stxsiwx */ + op->reg = rd | ((word & 1) << 5); + op->type = MKOP(STORE_VSX, 0, 4); + op->element_size = 8; + break; + + case 268: /* lxvx */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 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; + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 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 = ((word & 0x20) ? VSX_LDLEFT : 0) | + VSX_CHECK_VEC; + break; + } + case 332: /* lxvdsx */ + op->reg = rd | ((word & 1) << 5); + op->type = MKOP(LOAD_VSX, 0, 8); + op->element_size = 8; + op->vsx_flags = VSX_SPLAT; + break; + + case 364: /* lxvwsx */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 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 */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 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; + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 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 = ((word & 0x20) ? VSX_LDLEFT : 0) | + VSX_CHECK_VEC; + break; + } + case 524: /* lxsspx */ + op->reg = rd | ((word & 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 | ((word & 1) << 5); + op->type = MKOP(LOAD_VSX, 0, 8); + op->element_size = 8; + break; + + case 652: /* stxsspx */ + op->reg = rd | ((word & 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 | ((word & 1) << 5); + op->type = MKOP(STORE_VSX, 0, 8); + op->element_size = 8; + break; + + case 780: /* lxvw4x */ + op->reg = rd | ((word & 1) << 5); + op->type = MKOP(LOAD_VSX, 0, 16); + op->element_size = 4; + break; + + case 781: /* lxsibzx */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 1) << 5); + op->type = MKOP(LOAD_VSX, 0, 1); + op->element_size = 8; + op->vsx_flags = VSX_CHECK_VEC; + break; + + case 812: /* lxvh8x */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 1) << 5); + op->type = MKOP(LOAD_VSX, 0, 16); + op->element_size = 2; + op->vsx_flags = VSX_CHECK_VEC; + break; + + case 813: /* lxsihzx */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 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 | ((word & 1) << 5); + op->type = MKOP(LOAD_VSX, 0, 16); + op->element_size = 8; + break; + + case 876: /* lxvb16x */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 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 | ((word & 1) << 5); + op->type = MKOP(STORE_VSX, 0, 16); + op->element_size = 4; + break; + + case 909: /* stxsibx */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 1) << 5); + op->type = MKOP(STORE_VSX, 0, 1); + op->element_size = 8; + op->vsx_flags = VSX_CHECK_VEC; + break; + + case 940: /* stxvh8x */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 1) << 5); + op->type = MKOP(STORE_VSX, 0, 16); + op->element_size = 2; + op->vsx_flags = VSX_CHECK_VEC; + break; + + case 941: /* stxsihx */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 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 | ((word & 1) << 5); + op->type = MKOP(STORE_VSX, 0, 16); + op->element_size = 8; + break; + + case 1004: /* stxvb16x */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->reg = rd | ((word & 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(word, regs); + break; + + case 34: /* lbz */ + case 35: /* lbzu */ + op->type = MKOP(LOAD, u, 1); + op->ea = dform_ea(word, regs); + break; + + case 36: /* stw */ + case 37: /* stwu */ + op->type = MKOP(STORE, u, 4); + op->ea = dform_ea(word, regs); + break; + + case 38: /* stb */ + case 39: /* stbu */ + op->type = MKOP(STORE, u, 1); + op->ea = dform_ea(word, regs); + break; + + case 40: /* lhz */ + case 41: /* lhzu */ + op->type = MKOP(LOAD, u, 2); + op->ea = dform_ea(word, regs); + break; + + case 42: /* lha */ + case 43: /* lhau */ + op->type = MKOP(LOAD, SIGNEXT | u, 2); + op->ea = dform_ea(word, regs); + break; + + case 44: /* sth */ + case 45: /* sthu */ + op->type = MKOP(STORE, u, 2); + op->ea = dform_ea(word, 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(word, regs); + break; + + case 47: /* stmw */ + op->type = MKOP(STORE_MULTI, 0, 4 * (32 - rd)); + op->ea = dform_ea(word, regs); + break; + +#ifdef CONFIG_PPC_FPU + case 48: /* lfs */ + case 49: /* lfsu */ + op->type = MKOP(LOAD_FP, u | FPCONV, 4); + op->ea = dform_ea(word, regs); + break; + + case 50: /* lfd */ + case 51: /* lfdu */ + op->type = MKOP(LOAD_FP, u, 8); + op->ea = dform_ea(word, regs); + break; + + case 52: /* stfs */ + case 53: /* stfsu */ + op->type = MKOP(STORE_FP, u | FPCONV, 4); + op->ea = dform_ea(word, regs); + break; + + case 54: /* stfd */ + case 55: /* stfdu */ + op->type = MKOP(STORE_FP, u, 8); + op->ea = dform_ea(word, regs); + break; +#endif + +#ifdef __powerpc64__ + case 56: /* lq */ + if (!((rd & 1) || (rd == ra))) + op->type = MKOP(LOAD, 0, 16); + op->ea = dqform_ea(word, regs); + break; +#endif + +#ifdef CONFIG_VSX + case 57: /* lfdp, lxsd, lxssp */ + op->ea = dsform_ea(word, regs); + switch (word & 3) { + case 0: /* lfdp */ + if (rd & 1) + break; /* reg must be even */ + op->type = MKOP(LOAD_FP, 0, 16); + break; + case 2: /* lxsd */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + 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 */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + 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(word, regs); + switch (word & 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: /* stfdp, lxv, stxsd, stxssp, stxv */ + switch (word & 7) { + case 0: /* stfdp with LSB of DS field = 0 */ + case 4: /* stfdp with LSB of DS field = 1 */ + op->ea = dsform_ea(word, regs); + op->type = MKOP(STORE_FP, 0, 16); + break; + + case 1: /* lxv */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->ea = dqform_ea(word, regs); + if (word & 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 */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->ea = dsform_ea(word, 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 */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->ea = dsform_ea(word, 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 */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + op->ea = dqform_ea(word, regs); + if (word & 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(word, regs); + switch (word & 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; + case 1: /* Prefixed instructions */ + if (!cpu_has_feature(CPU_FTR_ARCH_31)) + goto unknown_opcode; + + prefix_r = GET_PREFIX_R(word); + ra = GET_PREFIX_RA(suffix); + op->update_reg = ra; + rd = (suffix >> 21) & 0x1f; + op->reg = rd; + op->val = regs->gpr[rd]; + + suffixopcode = get_op(suffix); + prefixtype = (word >> 24) & 0x3; + switch (prefixtype) { + case 0: /* Type 00 Eight-Byte Load/Store */ + if (prefix_r && ra) + break; + op->ea = mlsd_8lsd_ea(word, suffix, regs); + switch (suffixopcode) { + case 41: /* plwa */ + op->type = MKOP(LOAD, PREFIXED | SIGNEXT, 4); + break; +#ifdef CONFIG_VSX + case 42: /* plxsd */ + op->reg = rd + 32; + op->type = MKOP(LOAD_VSX, PREFIXED, 8); + op->element_size = 8; + op->vsx_flags = VSX_CHECK_VEC; + break; + case 43: /* plxssp */ + op->reg = rd + 32; + op->type = MKOP(LOAD_VSX, PREFIXED, 4); + op->element_size = 8; + op->vsx_flags = VSX_FPCONV | VSX_CHECK_VEC; + break; + case 46: /* pstxsd */ + op->reg = rd + 32; + op->type = MKOP(STORE_VSX, PREFIXED, 8); + op->element_size = 8; + op->vsx_flags = VSX_CHECK_VEC; + break; + case 47: /* pstxssp */ + op->reg = rd + 32; + op->type = MKOP(STORE_VSX, PREFIXED, 4); + op->element_size = 8; + op->vsx_flags = VSX_FPCONV | VSX_CHECK_VEC; + break; + case 51: /* plxv1 */ + op->reg += 32; + fallthrough; + case 50: /* plxv0 */ + op->type = MKOP(LOAD_VSX, PREFIXED, 16); + op->element_size = 16; + op->vsx_flags = VSX_CHECK_VEC; + break; + case 55: /* pstxv1 */ + op->reg = rd + 32; + fallthrough; + case 54: /* pstxv0 */ + op->type = MKOP(STORE_VSX, PREFIXED, 16); + op->element_size = 16; + op->vsx_flags = VSX_CHECK_VEC; + break; +#endif /* CONFIG_VSX */ + case 56: /* plq */ + op->type = MKOP(LOAD, PREFIXED, 16); + break; + case 57: /* pld */ + op->type = MKOP(LOAD, PREFIXED, 8); + break; + case 60: /* pstq */ + op->type = MKOP(STORE, PREFIXED, 16); + break; + case 61: /* pstd */ + op->type = MKOP(STORE, PREFIXED, 8); + break; + } + break; + case 1: /* Type 01 Eight-Byte Register-to-Register */ + break; + case 2: /* Type 10 Modified Load/Store */ + if (prefix_r && ra) + break; + op->ea = mlsd_8lsd_ea(word, suffix, regs); + switch (suffixopcode) { + case 32: /* plwz */ + op->type = MKOP(LOAD, PREFIXED, 4); + break; + case 34: /* plbz */ + op->type = MKOP(LOAD, PREFIXED, 1); + break; + case 36: /* pstw */ + op->type = MKOP(STORE, PREFIXED, 4); + break; + case 38: /* pstb */ + op->type = MKOP(STORE, PREFIXED, 1); + break; + case 40: /* plhz */ + op->type = MKOP(LOAD, PREFIXED, 2); + break; + case 42: /* plha */ + op->type = MKOP(LOAD, PREFIXED | SIGNEXT, 2); + break; + case 44: /* psth */ + op->type = MKOP(STORE, PREFIXED, 2); + break; + case 48: /* plfs */ + op->type = MKOP(LOAD_FP, PREFIXED | FPCONV, 4); + break; + case 50: /* plfd */ + op->type = MKOP(LOAD_FP, PREFIXED, 8); + break; + case 52: /* pstfs */ + op->type = MKOP(STORE_FP, PREFIXED | FPCONV, 4); + break; + case 54: /* pstfd */ + op->type = MKOP(STORE_FP, PREFIXED, 8); + break; + } + break; + case 3: /* Type 11 Modified Register-to-Register */ + break; + } +#endif /* __powerpc64__ */ + + } + + if (OP_IS_LOAD_STORE(op->type) && (op->type & UPDATE)) { + switch (GETTYPE(op->type)) { + case LOAD: + if (ra == rd) + goto unknown_opcode; + fallthrough; + case STORE: + case LOAD_FP: + case STORE_FP: + if (ra == 0) + goto unknown_opcode; + } + } + +#ifdef CONFIG_VSX + if ((GETTYPE(op->type) == LOAD_VSX || + GETTYPE(op->type) == STORE_VSX) && + !cpu_has_feature(CPU_FTR_VSX)) { + return -1; + } +#endif /* CONFIG_VSX */ + + return 0; + + unknown_opcode: + op->type = UNKNOWN; + return 0; + + logical_done: + if (word & 1) + set_cr0(regs, op); + logical_done_nocc: + op->reg = ra; + op->type |= SETREG; + return 1; + + arith_done: + if (word & 1) + set_cr0(regs, op); + 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 + GETLENGTH(op->type)); + switch (GETTYPE(op->type)) { + 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; +#ifdef CONFIG_PPC64 + case BARRIER_LWSYNC: + asm volatile("lwsync" : : : "memory"); + break; + case BARRIER_PTESYNC: + asm volatile("ptesync" : : : "memory"); + break; +#endif + } + 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; +} +NOKPROBE_SYMBOL(emulate_update_regs); + +/* + * Emulate a previously-analysed load or store instruction. + * Return values are: + * 0 = instruction emulated successfully + * -EFAULT = address out of range or access faulted (regs->dar + * contains the faulting address) + * -EACCES = misaligned access, instruction requires alignment + * -EINVAL = unknown operation in *op + */ +int emulate_loadstore(struct pt_regs *regs, struct instruction_op *op) +{ + int err, size, type; + int i, rd, nb; + unsigned int cr; + unsigned long val; + unsigned long ea; + bool cross_endian; + + err = 0; + size = GETSIZE(op->type); + type = GETTYPE(op->type); + cross_endian = (regs->msr & MSR_LE) != (MSR_KERNEL & MSR_LE); + ea = truncate_if_32bit(regs->msr, op->ea); + + switch (type) { + case LARX: + if (ea & (size - 1)) + return -EACCES; /* can't handle misaligned */ + if (!address_ok(regs, ea, size)) + return -EFAULT; + err = 0; + val = 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, ®s->gpr[op->reg]); + break; +#endif + default: + return -EINVAL; + } + if (err) { + regs->dar = ea; + break; + } + if (size < 16) + regs->gpr[op->reg] = val; + break; + + case STCX: + if (ea & (size - 1)) + return -EACCES; /* can't handle misaligned */ + if (!address_ok(regs, ea, size)) + return -EFAULT; + 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, "sthcx.", 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 -EINVAL; + } + if (!err) + regs->ccr = (regs->ccr & 0x0fffffff) | + (cr & 0xe0000000) | + ((regs->xer >> 3) & 0x10000000); + else + regs->dar = ea; + break; + + case LOAD: +#ifdef __powerpc64__ + if (size == 16) { + err = emulate_lq(regs, ea, op->reg, cross_endian); + break; + } +#endif + err = read_mem(®s->gpr[op->reg], ea, size, regs); + if (!err) { + if (op->type & SIGNEXT) + do_signext(®s->gpr[op->reg], size); + if ((op->type & BYTEREV) == (cross_endian ? 0 : BYTEREV)) + do_byterev(®s->gpr[op->reg], size); + } + break; + +#ifdef CONFIG_PPC_FPU + case LOAD_FP: + /* + * If the instruction is in userspace, we can emulate it even + * if the VMX state is not live, because we have the state + * stored in the thread_struct. If the instruction is in + * the kernel, we must not touch the state in the thread_struct. + */ + if (!(regs->msr & MSR_PR) && !(regs->msr & MSR_FP)) + return 0; + err = do_fp_load(op, ea, regs, cross_endian); + break; +#endif +#ifdef CONFIG_ALTIVEC + case LOAD_VMX: + if (!(regs->msr & MSR_PR) && !(regs->msr & MSR_VEC)) + return 0; + err = do_vec_load(op->reg, ea, size, regs, cross_endian); + break; +#endif +#ifdef CONFIG_VSX + case LOAD_VSX: { + 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 & MSR_PR) && !(regs->msr & msrbit)) + return 0; + err = do_vsx_load(op, ea, regs, cross_endian); + break; + } +#endif + case LOAD_MULTI: + if (!address_ok(regs, ea, size)) + return -EFAULT; + rd = op->reg; + for (i = 0; i < size; i += 4) { + unsigned int v32 = 0; + + nb = size - i; + if (nb > 4) + nb = 4; + err = copy_mem_in((u8 *) &v32, ea, nb, regs); + if (err) + break; + if (unlikely(cross_endian)) + v32 = byterev_4(v32); + regs->gpr[rd] = v32; + ea += 4; + /* reg number wraps from 31 to 0 for lsw[ix] */ + rd = (rd + 1) & 0x1f; + } + break; + + case STORE: +#ifdef __powerpc64__ + if (size == 16) { + err = emulate_stq(regs, ea, op->reg, cross_endian); + break; + } +#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); + break; + } + if (unlikely(cross_endian)) + do_byterev(&op->val, size); + err = write_mem(op->val, ea, size, regs); + break; + +#ifdef CONFIG_PPC_FPU + case STORE_FP: + if (!(regs->msr & MSR_PR) && !(regs->msr & MSR_FP)) + return 0; + err = do_fp_store(op, ea, regs, cross_endian); + break; +#endif +#ifdef CONFIG_ALTIVEC + case STORE_VMX: + if (!(regs->msr & MSR_PR) && !(regs->msr & MSR_VEC)) + return 0; + err = do_vec_store(op->reg, ea, size, regs, cross_endian); + break; +#endif +#ifdef CONFIG_VSX + case STORE_VSX: { + 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 & MSR_PR) && !(regs->msr & msrbit)) + return 0; + err = do_vsx_store(op, ea, regs, cross_endian); + break; + } +#endif + case STORE_MULTI: + if (!address_ok(regs, ea, size)) + return -EFAULT; + rd = op->reg; + for (i = 0; i < size; i += 4) { + unsigned int v32 = regs->gpr[rd]; + + nb = size - i; + if (nb > 4) + nb = 4; + if (unlikely(cross_endian)) + v32 = byterev_4(v32); + err = copy_mem_out((u8 *) &v32, ea, nb, regs); + if (err) + break; + ea += 4; + /* reg number wraps from 31 to 0 for stsw[ix] */ + rd = (rd + 1) & 0x1f; + } + break; + + default: + return -EINVAL; + } + + if (err) + return err; + + if (op->type & UPDATE) + regs->gpr[op->update_reg] = op->ea; + + return 0; +} +NOKPROBE_SYMBOL(emulate_loadstore); + +/* + * 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, struct ppc_inst instr) +{ + struct instruction_op op; + int r, err, type; + unsigned long val; + 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; + type = GETTYPE(op.type); + + if (OP_IS_LOAD_STORE(type)) { + err = emulate_loadstore(regs, &op); + if (err) + return 0; + goto instr_done; + } + + switch (type) { + case CACHEOP: + ea = truncate_if_32bit(regs->msr, op.ea); + 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; + case DCBZ: + err = emulate_dcbz(ea, regs); + break; + } + if (err) { + regs->dar = ea; + return 0; + } + 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 (IS_ENABLED(CONFIG_PPC_FAST_ENDIAN_SWITCH) && + cpu_has_feature(CPU_FTR_REAL_LE) && + regs->gpr[0] == 0x1ebe) { + 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; + +#ifdef CONFIG_PPC_BOOK3S_64 + case SYSCALL_VECTORED_0: /* scv 0 */ + 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_vectored_emulate; + regs->msr = MSR_KERNEL; + return 1; +#endif + + case RFI: + return -1; +#endif + } + return 0; + + instr_done: + regs->nip = truncate_if_32bit(regs->msr, regs->nip + GETLENGTH(op.type)); + return 1; +} +NOKPROBE_SYMBOL(emulate_step); |