mirror of
https://github.com/edk2-porting/linux-next.git
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9a5c1284a3
Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
1506 lines
48 KiB
C
1506 lines
48 KiB
C
/*
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* arch/arm/kernel/kprobes-decode.c
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*
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* Copyright (C) 2006, 2007 Motorola Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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/*
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* We do not have hardware single-stepping on ARM, This
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* effort is further complicated by the ARM not having a
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* "next PC" register. Instructions that change the PC
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* can't be safely single-stepped in a MP environment, so
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* we have a lot of work to do:
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*
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* In the prepare phase:
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* *) If it is an instruction that does anything
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* with the CPU mode, we reject it for a kprobe.
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* (This is out of laziness rather than need. The
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* instructions could be simulated.)
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*
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* *) Otherwise, decode the instruction rewriting its
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* registers to take fixed, ordered registers and
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* setting a handler for it to run the instruction.
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*
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* In the execution phase by an instruction's handler:
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*
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* *) If the PC is written to by the instruction, the
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* instruction must be fully simulated in software.
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*
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* *) Otherwise, a modified form of the instruction is
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* directly executed. Its handler calls the
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* instruction in insn[0]. In insn[1] is a
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* "mov pc, lr" to return.
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*
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* Before calling, load up the reordered registers
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* from the original instruction's registers. If one
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* of the original input registers is the PC, compute
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* and adjust the appropriate input register.
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*
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* After call completes, copy the output registers to
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* the original instruction's original registers.
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*
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* We don't use a real breakpoint instruction since that
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* would have us in the kernel go from SVC mode to SVC
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* mode losing the link register. Instead we use an
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* undefined instruction. To simplify processing, the
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* undefined instruction used for kprobes must be reserved
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* exclusively for kprobes use.
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*
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* TODO: ifdef out some instruction decoding based on architecture.
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*/
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#include <linux/kernel.h>
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#include <linux/kprobes.h>
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#include "kprobes.h"
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#define sign_extend(x, signbit) ((x) | (0 - ((x) & (1 << (signbit)))))
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#define branch_displacement(insn) sign_extend(((insn) & 0xffffff) << 2, 25)
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#define is_r15(insn, bitpos) (((insn) & (0xf << bitpos)) == (0xf << bitpos))
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#define PSR_fs (PSR_f|PSR_s)
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#define KPROBE_RETURN_INSTRUCTION 0xe1a0f00e /* mov pc, lr */
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typedef long (insn_0arg_fn_t)(void);
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typedef long (insn_1arg_fn_t)(long);
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typedef long (insn_2arg_fn_t)(long, long);
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typedef long (insn_3arg_fn_t)(long, long, long);
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typedef long (insn_4arg_fn_t)(long, long, long, long);
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typedef long long (insn_llret_0arg_fn_t)(void);
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typedef long long (insn_llret_3arg_fn_t)(long, long, long);
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typedef long long (insn_llret_4arg_fn_t)(long, long, long, long);
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union reg_pair {
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long long dr;
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#ifdef __LITTLE_ENDIAN
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struct { long r0, r1; };
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#else
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struct { long r1, r0; };
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#endif
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};
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/*
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* The insnslot_?arg_r[w]flags() functions below are to keep the
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* msr -> *fn -> mrs instruction sequences indivisible so that
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* the state of the CPSR flags aren't inadvertently modified
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* just before or just after the call.
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*/
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static inline long __kprobes
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insnslot_0arg_rflags(long cpsr, insn_0arg_fn_t *fn)
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{
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register long ret asm("r0");
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret)
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: [cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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return ret;
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}
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static inline long long __kprobes
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insnslot_llret_0arg_rflags(long cpsr, insn_llret_0arg_fn_t *fn)
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{
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register long ret0 asm("r0");
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register long ret1 asm("r1");
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union reg_pair fnr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret0), "=r" (ret1)
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: [cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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fnr.r0 = ret0;
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fnr.r1 = ret1;
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return fnr.dr;
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}
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static inline long __kprobes
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insnslot_1arg_rflags(long r0, long cpsr, insn_1arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long ret asm("r0");
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret)
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: "0" (rr0), [cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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return ret;
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}
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static inline long __kprobes
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insnslot_2arg_rflags(long r0, long r1, long cpsr, insn_2arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long ret asm("r0");
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret)
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: "0" (rr0), "r" (rr1),
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[cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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return ret;
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}
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static inline long __kprobes
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insnslot_3arg_rflags(long r0, long r1, long r2, long cpsr, insn_3arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long rr2 asm("r2") = r2;
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register long ret asm("r0");
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret)
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: "0" (rr0), "r" (rr1), "r" (rr2),
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[cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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return ret;
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}
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static inline long long __kprobes
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insnslot_llret_3arg_rflags(long r0, long r1, long r2, long cpsr,
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insn_llret_3arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long rr2 asm("r2") = r2;
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register long ret0 asm("r0");
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register long ret1 asm("r1");
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union reg_pair fnr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret0), "=r" (ret1)
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: "0" (rr0), "r" (rr1), "r" (rr2),
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[cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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fnr.r0 = ret0;
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fnr.r1 = ret1;
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return fnr.dr;
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}
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static inline long __kprobes
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insnslot_4arg_rflags(long r0, long r1, long r2, long r3, long cpsr,
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insn_4arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long rr2 asm("r2") = r2;
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register long rr3 asm("r3") = r3;
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register long ret asm("r0");
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret)
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: "0" (rr0), "r" (rr1), "r" (rr2), "r" (rr3),
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[cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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return ret;
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}
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static inline long __kprobes
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insnslot_1arg_rwflags(long r0, long *cpsr, insn_1arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long ret asm("r0");
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long oldcpsr = *cpsr;
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long newcpsr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[oldcpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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"mrs %[newcpsr], cpsr \n\t"
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: "=r" (ret), [newcpsr] "=r" (newcpsr)
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: "0" (rr0), [oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
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return ret;
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}
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static inline long __kprobes
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insnslot_2arg_rwflags(long r0, long r1, long *cpsr, insn_2arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long ret asm("r0");
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long oldcpsr = *cpsr;
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long newcpsr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[oldcpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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"mrs %[newcpsr], cpsr \n\t"
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: "=r" (ret), [newcpsr] "=r" (newcpsr)
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: "0" (rr0), "r" (rr1), [oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
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return ret;
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}
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static inline long __kprobes
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insnslot_3arg_rwflags(long r0, long r1, long r2, long *cpsr,
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insn_3arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long rr2 asm("r2") = r2;
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register long ret asm("r0");
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long oldcpsr = *cpsr;
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long newcpsr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[oldcpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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"mrs %[newcpsr], cpsr \n\t"
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: "=r" (ret), [newcpsr] "=r" (newcpsr)
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: "0" (rr0), "r" (rr1), "r" (rr2),
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[oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
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return ret;
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}
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static inline long __kprobes
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insnslot_4arg_rwflags(long r0, long r1, long r2, long r3, long *cpsr,
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insn_4arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long rr2 asm("r2") = r2;
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register long rr3 asm("r3") = r3;
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register long ret asm("r0");
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long oldcpsr = *cpsr;
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long newcpsr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[oldcpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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"mrs %[newcpsr], cpsr \n\t"
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: "=r" (ret), [newcpsr] "=r" (newcpsr)
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: "0" (rr0), "r" (rr1), "r" (rr2), "r" (rr3),
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[oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
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return ret;
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}
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static inline long long __kprobes
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insnslot_llret_4arg_rwflags(long r0, long r1, long r2, long r3, long *cpsr,
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insn_llret_4arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long rr2 asm("r2") = r2;
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register long rr3 asm("r3") = r3;
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register long ret0 asm("r0");
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register long ret1 asm("r1");
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long oldcpsr = *cpsr;
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long newcpsr;
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union reg_pair fnr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[oldcpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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"mrs %[newcpsr], cpsr \n\t"
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: "=r" (ret0), "=r" (ret1), [newcpsr] "=r" (newcpsr)
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: "0" (rr0), "r" (rr1), "r" (rr2), "r" (rr3),
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[oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
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fnr.r0 = ret0;
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fnr.r1 = ret1;
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return fnr.dr;
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}
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/*
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* To avoid the complications of mimicing single-stepping on a
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* processor without a Next-PC or a single-step mode, and to
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* avoid having to deal with the side-effects of boosting, we
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* simulate or emulate (almost) all ARM instructions.
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*
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* "Simulation" is where the instruction's behavior is duplicated in
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* C code. "Emulation" is where the original instruction is rewritten
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* and executed, often by altering its registers.
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*
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* By having all behavior of the kprobe'd instruction completed before
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* returning from the kprobe_handler(), all locks (scheduler and
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* interrupt) can safely be released. There is no need for secondary
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* breakpoints, no race with MP or preemptable kernels, nor having to
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* clean up resources counts at a later time impacting overall system
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* performance. By rewriting the instruction, only the minimum registers
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* need to be loaded and saved back optimizing performance.
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*
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* Calling the insnslot_*_rwflags version of a function doesn't hurt
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* anything even when the CPSR flags aren't updated by the
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* instruction. It's just a little slower in return for saving
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* a little space by not having a duplicate function that doesn't
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* update the flags. (The same optimization can be said for
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* instructions that do or don't perform register writeback)
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* Also, instructions can either read the flags, only write the
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* flags, or read and write the flags. To save combinations
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* rather than for sheer performance, flag functions just assume
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* read and write of flags.
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*/
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static void __kprobes simulate_bbl(struct kprobe *p, struct pt_regs *regs)
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{
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kprobe_opcode_t insn = p->opcode;
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long iaddr = (long)p->addr;
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int disp = branch_displacement(insn);
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if (insn & (1 << 24))
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regs->ARM_lr = iaddr + 4;
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regs->ARM_pc = iaddr + 8 + disp;
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}
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static void __kprobes simulate_blx1(struct kprobe *p, struct pt_regs *regs)
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{
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kprobe_opcode_t insn = p->opcode;
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long iaddr = (long)p->addr;
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int disp = branch_displacement(insn);
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regs->ARM_lr = iaddr + 4;
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regs->ARM_pc = iaddr + 8 + disp + ((insn >> 23) & 0x2);
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regs->ARM_cpsr |= PSR_T_BIT;
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}
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static void __kprobes simulate_blx2bx(struct kprobe *p, struct pt_regs *regs)
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{
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kprobe_opcode_t insn = p->opcode;
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int rm = insn & 0xf;
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long rmv = regs->uregs[rm];
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if (insn & (1 << 5))
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regs->ARM_lr = (long)p->addr + 4;
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regs->ARM_pc = rmv & ~0x1;
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regs->ARM_cpsr &= ~PSR_T_BIT;
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if (rmv & 0x1)
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regs->ARM_cpsr |= PSR_T_BIT;
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}
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static void __kprobes simulate_mrs(struct kprobe *p, struct pt_regs *regs)
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{
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kprobe_opcode_t insn = p->opcode;
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int rd = (insn >> 12) & 0xf;
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unsigned long mask = 0xf8ff03df; /* Mask out execution state */
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regs->uregs[rd] = regs->ARM_cpsr & mask;
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}
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static void __kprobes simulate_mov_ipsp(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
regs->uregs[12] = regs->uregs[13];
|
|
}
|
|
|
|
static void __kprobes emulate_ldrd(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_2arg_fn_t *i_fn = (insn_2arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long ppc = (long)p->addr + 8;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf; /* rm may be invalid, don't care. */
|
|
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
|
|
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
|
|
|
|
/* Not following the C calling convention here, so need asm(). */
|
|
__asm__ __volatile__ (
|
|
"ldr r0, %[rn] \n\t"
|
|
"ldr r1, %[rm] \n\t"
|
|
"msr cpsr_fs, %[cpsr]\n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[i_fn] \n\t"
|
|
"str r0, %[rn] \n\t" /* in case of writeback */
|
|
"str r2, %[rd0] \n\t"
|
|
"str r3, %[rd1] \n\t"
|
|
: [rn] "+m" (rnv),
|
|
[rd0] "=m" (regs->uregs[rd]),
|
|
[rd1] "=m" (regs->uregs[rd+1])
|
|
: [rm] "m" (rmv),
|
|
[cpsr] "r" (regs->ARM_cpsr),
|
|
[i_fn] "r" (i_fn)
|
|
: "r0", "r1", "r2", "r3", "lr", "cc"
|
|
);
|
|
if (is_writeback(insn))
|
|
regs->uregs[rn] = rnv;
|
|
}
|
|
|
|
static void __kprobes emulate_strd(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_4arg_fn_t *i_fn = (insn_4arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long ppc = (long)p->addr + 8;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
|
|
/* rm/rmv may be invalid, don't care. */
|
|
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
|
|
long rnv_wb;
|
|
|
|
rnv_wb = insnslot_4arg_rflags(rnv, rmv, regs->uregs[rd],
|
|
regs->uregs[rd+1],
|
|
regs->ARM_cpsr, i_fn);
|
|
if (is_writeback(insn))
|
|
regs->uregs[rn] = rnv_wb;
|
|
}
|
|
|
|
static void __kprobes emulate_ldr(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_llret_3arg_fn_t *i_fn = (insn_llret_3arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long ppc = (long)p->addr + 8;
|
|
union reg_pair fnr;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rdv;
|
|
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
|
|
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
|
|
long cpsr = regs->ARM_cpsr;
|
|
|
|
fnr.dr = insnslot_llret_3arg_rflags(rnv, 0, rmv, cpsr, i_fn);
|
|
if (rn != 15)
|
|
regs->uregs[rn] = fnr.r0; /* Save Rn in case of writeback. */
|
|
rdv = fnr.r1;
|
|
|
|
if (rd == 15) {
|
|
#if __LINUX_ARM_ARCH__ >= 5
|
|
cpsr &= ~PSR_T_BIT;
|
|
if (rdv & 0x1)
|
|
cpsr |= PSR_T_BIT;
|
|
regs->ARM_cpsr = cpsr;
|
|
rdv &= ~0x1;
|
|
#else
|
|
rdv &= ~0x2;
|
|
#endif
|
|
}
|
|
regs->uregs[rd] = rdv;
|
|
}
|
|
|
|
static void __kprobes emulate_str(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_3arg_fn_t *i_fn = (insn_3arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long iaddr = (long)p->addr;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rdv = (rd == 15) ? iaddr + str_pc_offset : regs->uregs[rd];
|
|
long rnv = (rn == 15) ? iaddr + 8 : regs->uregs[rn];
|
|
long rmv = regs->uregs[rm]; /* rm/rmv may be invalid, don't care. */
|
|
long rnv_wb;
|
|
|
|
rnv_wb = insnslot_3arg_rflags(rnv, rdv, rmv, regs->ARM_cpsr, i_fn);
|
|
if (rn != 15)
|
|
regs->uregs[rn] = rnv_wb; /* Save Rn in case of writeback. */
|
|
}
|
|
|
|
static void __kprobes emulate_sat(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rmv = regs->uregs[rm];
|
|
|
|
/* Writes Q flag */
|
|
regs->uregs[rd] = insnslot_1arg_rwflags(rmv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes emulate_sel(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_2arg_fn_t *i_fn = (insn_2arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rnv = regs->uregs[rn];
|
|
long rmv = regs->uregs[rm];
|
|
|
|
/* Reads GE bits */
|
|
regs->uregs[rd] = insnslot_2arg_rflags(rnv, rmv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes emulate_none(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_0arg_fn_t *i_fn = (insn_0arg_fn_t *)&p->ainsn.insn[0];
|
|
|
|
insnslot_0arg_rflags(regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes emulate_nop(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rd12_modify(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
long rdv = regs->uregs[rd];
|
|
|
|
regs->uregs[rd] = insnslot_1arg_rflags(rdv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rd12rn0_modify(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_2arg_fn_t *i_fn = (insn_2arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = insn & 0xf;
|
|
long rdv = regs->uregs[rd];
|
|
long rnv = regs->uregs[rn];
|
|
|
|
regs->uregs[rd] = insnslot_2arg_rflags(rdv, rnv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes emulate_rd12rm0(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rmv = regs->uregs[rm];
|
|
|
|
regs->uregs[rd] = insnslot_1arg_rflags(rmv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rd12rn16rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_2arg_fn_t *i_fn = (insn_2arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rnv = regs->uregs[rn];
|
|
long rmv = regs->uregs[rm];
|
|
|
|
regs->uregs[rd] =
|
|
insnslot_2arg_rwflags(rnv, rmv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rd16rn12rs8rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_3arg_fn_t *i_fn = (insn_3arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 16) & 0xf;
|
|
int rn = (insn >> 12) & 0xf;
|
|
int rs = (insn >> 8) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rnv = regs->uregs[rn];
|
|
long rsv = regs->uregs[rs];
|
|
long rmv = regs->uregs[rm];
|
|
|
|
regs->uregs[rd] =
|
|
insnslot_3arg_rwflags(rnv, rsv, rmv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rd16rs8rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_2arg_fn_t *i_fn = (insn_2arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 16) & 0xf;
|
|
int rs = (insn >> 8) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rsv = regs->uregs[rs];
|
|
long rmv = regs->uregs[rm];
|
|
|
|
regs->uregs[rd] =
|
|
insnslot_2arg_rwflags(rsv, rmv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rdhi16rdlo12rs8rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_llret_4arg_fn_t *i_fn = (insn_llret_4arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
union reg_pair fnr;
|
|
int rdhi = (insn >> 16) & 0xf;
|
|
int rdlo = (insn >> 12) & 0xf;
|
|
int rs = (insn >> 8) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rsv = regs->uregs[rs];
|
|
long rmv = regs->uregs[rm];
|
|
|
|
fnr.dr = insnslot_llret_4arg_rwflags(regs->uregs[rdhi],
|
|
regs->uregs[rdlo], rsv, rmv,
|
|
®s->ARM_cpsr, i_fn);
|
|
regs->uregs[rdhi] = fnr.r0;
|
|
regs->uregs[rdlo] = fnr.r1;
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_alu_imm_rflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
long rnv = (rn == 15) ? (long)p->addr + 8 : regs->uregs[rn];
|
|
|
|
regs->uregs[rd] = insnslot_1arg_rflags(rnv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_alu_imm_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
long rnv = (rn == 15) ? (long)p->addr + 8 : regs->uregs[rn];
|
|
|
|
regs->uregs[rd] = insnslot_1arg_rwflags(rnv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_alu_tests_imm(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rn = (insn >> 16) & 0xf;
|
|
long rnv = (rn == 15) ? (long)p->addr + 8 : regs->uregs[rn];
|
|
|
|
insnslot_1arg_rwflags(rnv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_alu_rflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_3arg_fn_t *i_fn = (insn_3arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long ppc = (long)p->addr + 8;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf; /* rn/rnv/rs/rsv may be */
|
|
int rs = (insn >> 8) & 0xf; /* invalid, don't care. */
|
|
int rm = insn & 0xf;
|
|
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
|
|
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
|
|
long rsv = regs->uregs[rs];
|
|
|
|
regs->uregs[rd] =
|
|
insnslot_3arg_rflags(rnv, rmv, rsv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_alu_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_3arg_fn_t *i_fn = (insn_3arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long ppc = (long)p->addr + 8;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf; /* rn/rnv/rs/rsv may be */
|
|
int rs = (insn >> 8) & 0xf; /* invalid, don't care. */
|
|
int rm = insn & 0xf;
|
|
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
|
|
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
|
|
long rsv = regs->uregs[rs];
|
|
|
|
regs->uregs[rd] =
|
|
insnslot_3arg_rwflags(rnv, rmv, rsv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_alu_tests(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_3arg_fn_t *i_fn = (insn_3arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long ppc = (long)p->addr + 8;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rs = (insn >> 8) & 0xf; /* rs/rsv may be invalid, don't care. */
|
|
int rm = insn & 0xf;
|
|
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
|
|
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
|
|
long rsv = regs->uregs[rs];
|
|
|
|
insnslot_3arg_rwflags(rnv, rmv, rsv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_ldr_str(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
int not_imm = (insn & (1 << 26)) ? (insn & (1 << 25))
|
|
: (~insn & (1 << 22));
|
|
|
|
if (is_writeback(insn) && is_r15(insn, 16))
|
|
return INSN_REJECTED; /* Writeback to PC */
|
|
|
|
insn &= 0xfff00fff;
|
|
insn |= 0x00001000; /* Rn = r0, Rd = r1 */
|
|
if (not_imm) {
|
|
insn &= ~0xf;
|
|
insn |= 2; /* Rm = r2 */
|
|
}
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = (insn & (1 << 20)) ? emulate_ldr : emulate_str;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd12_modify(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 12))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
|
|
insn &= 0xffff0fff; /* Rd = r0 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd12_modify;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd12rn0_modify(kprobe_opcode_t insn,
|
|
struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 12))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
|
|
insn &= 0xffff0ff0; /* Rd = r0 */
|
|
insn |= 0x00000001; /* Rn = r1 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd12rn0_modify;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd12rm0(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 12))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
|
|
insn &= 0xffff0ff0; /* Rd = r0, Rm = r0 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd12rm0;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd12rn16rm0_wflags(kprobe_opcode_t insn,
|
|
struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 12))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
|
|
insn &= 0xfff00ff0; /* Rd = r0, Rn = r0 */
|
|
insn |= 0x00000001; /* Rm = r1 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd12rn16rm0_rwflags;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd16rs8rm0_wflags(kprobe_opcode_t insn,
|
|
struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 16))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
|
|
insn &= 0xfff0f0f0; /* Rd = r0, Rs = r0 */
|
|
insn |= 0x00000001; /* Rm = r1 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd16rs8rm0_rwflags;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd16rn12rs8rm0_wflags(kprobe_opcode_t insn,
|
|
struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 16))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
|
|
insn &= 0xfff000f0; /* Rd = r0, Rn = r0 */
|
|
insn |= 0x00000102; /* Rs = r1, Rm = r2 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd16rn12rs8rm0_rwflags;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rdhi16rdlo12rs8rm0_wflags(kprobe_opcode_t insn,
|
|
struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 16) || is_r15(insn, 12))
|
|
return INSN_REJECTED; /* RdHi or RdLo is PC */
|
|
|
|
insn &= 0xfff000f0; /* RdHi = r0, RdLo = r1 */
|
|
insn |= 0x00001203; /* Rs = r2, Rm = r3 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rdhi16rdlo12rs8rm0_rwflags;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
/*
|
|
* For the instruction masking and comparisons in all the "space_*"
|
|
* functions below, Do _not_ rearrange the order of tests unless
|
|
* you're very, very sure of what you are doing. For the sake of
|
|
* efficiency, the masks for some tests sometimes assume other test
|
|
* have been done prior to them so the number of patterns to test
|
|
* for an instruction set can be as broad as possible to reduce the
|
|
* number of tests needed.
|
|
*/
|
|
|
|
static const union decode_item arm_1111_table[] = {
|
|
/* Unconditional instructions */
|
|
|
|
/* memory hint 1111 0100 x001 xxxx xxxx xxxx xxxx xxxx */
|
|
/* PLDI (immediate) 1111 0100 x101 xxxx xxxx xxxx xxxx xxxx */
|
|
/* PLDW (immediate) 1111 0101 x001 xxxx xxxx xxxx xxxx xxxx */
|
|
/* PLD (immediate) 1111 0101 x101 xxxx xxxx xxxx xxxx xxxx */
|
|
DECODE_SIMULATE (0xfe300000, 0xf4100000, kprobe_simulate_nop),
|
|
|
|
/* BLX (immediate) 1111 101x xxxx xxxx xxxx xxxx xxxx xxxx */
|
|
DECODE_SIMULATE (0xfe000000, 0xfa000000, simulate_blx1),
|
|
|
|
/* CPS 1111 0001 0000 xxx0 xxxx xxxx xx0x xxxx */
|
|
/* SETEND 1111 0001 0000 0001 xxxx xxxx 0000 xxxx */
|
|
/* SRS 1111 100x x1x0 xxxx xxxx xxxx xxxx xxxx */
|
|
/* RFE 1111 100x x0x1 xxxx xxxx xxxx xxxx xxxx */
|
|
|
|
/* Coprocessor instructions... */
|
|
/* MCRR2 1111 1100 0100 xxxx xxxx xxxx xxxx xxxx */
|
|
/* MRRC2 1111 1100 0101 xxxx xxxx xxxx xxxx xxxx */
|
|
/* LDC2 1111 110x xxx1 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STC2 1111 110x xxx0 xxxx xxxx xxxx xxxx xxxx */
|
|
/* CDP2 1111 1110 xxxx xxxx xxxx xxxx xxx0 xxxx */
|
|
/* MCR2 1111 1110 xxx0 xxxx xxxx xxxx xxx1 xxxx */
|
|
/* MRC2 1111 1110 xxx1 xxxx xxxx xxxx xxx1 xxxx */
|
|
|
|
/* Other unallocated instructions... */
|
|
DECODE_END
|
|
};
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_000x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* cccc 0001 0xx0 xxxx xxxx xxxx xxxx xxx0 xxxx */
|
|
if ((insn & 0x0f900010) == 0x01000000) {
|
|
|
|
/* MRS cpsr : cccc 0001 0000 xxxx xxxx xxxx 0000 xxxx */
|
|
if ((insn & 0x0ff000f0) == 0x01000000) {
|
|
if (is_r15(insn, 12))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
asi->insn_handler = simulate_mrs;
|
|
return INSN_GOOD_NO_SLOT;
|
|
}
|
|
|
|
/* SMLALxy : cccc 0001 0100 xxxx xxxx xxxx 1xx0 xxxx */
|
|
if ((insn & 0x0ff00090) == 0x01400080)
|
|
return prep_emulate_rdhi16rdlo12rs8rm0_wflags(insn,
|
|
asi);
|
|
|
|
/* SMULWy : cccc 0001 0010 xxxx xxxx xxxx 1x10 xxxx */
|
|
/* SMULxy : cccc 0001 0110 xxxx xxxx xxxx 1xx0 xxxx */
|
|
if ((insn & 0x0ff000b0) == 0x012000a0 ||
|
|
(insn & 0x0ff00090) == 0x01600080)
|
|
return prep_emulate_rd16rs8rm0_wflags(insn, asi);
|
|
|
|
/* SMLAxy : cccc 0001 0000 xxxx xxxx xxxx 1xx0 xxxx : Q */
|
|
/* SMLAWy : cccc 0001 0010 xxxx xxxx xxxx 1x00 xxxx : Q */
|
|
if ((insn & 0x0ff00090) == 0x01000080 ||
|
|
(insn & 0x0ff000b0) == 0x01200080)
|
|
return prep_emulate_rd16rn12rs8rm0_wflags(insn, asi);
|
|
|
|
/* BXJ : cccc 0001 0010 xxxx xxxx xxxx 0010 xxxx */
|
|
/* MSR : cccc 0001 0x10 xxxx xxxx xxxx 0000 xxxx */
|
|
/* MRS spsr : cccc 0001 0100 xxxx xxxx xxxx 0000 xxxx */
|
|
|
|
/* Other instruction encodings aren't yet defined */
|
|
return INSN_REJECTED;
|
|
}
|
|
|
|
/* cccc 0001 0xx0 xxxx xxxx xxxx xxxx 0xx1 xxxx */
|
|
else if ((insn & 0x0f900090) == 0x01000010) {
|
|
|
|
/* BLX(2) : cccc 0001 0010 xxxx xxxx xxxx 0011 xxxx */
|
|
/* BX : cccc 0001 0010 xxxx xxxx xxxx 0001 xxxx */
|
|
if ((insn & 0x0ff000d0) == 0x01200010) {
|
|
if ((insn & 0x0ff000ff) == 0x0120003f)
|
|
return INSN_REJECTED; /* BLX pc */
|
|
asi->insn_handler = simulate_blx2bx;
|
|
return INSN_GOOD_NO_SLOT;
|
|
}
|
|
|
|
/* CLZ : cccc 0001 0110 xxxx xxxx xxxx 0001 xxxx */
|
|
if ((insn & 0x0ff000f0) == 0x01600010)
|
|
return prep_emulate_rd12rm0(insn, asi);
|
|
|
|
/* QADD : cccc 0001 0000 xxxx xxxx xxxx 0101 xxxx :Q */
|
|
/* QSUB : cccc 0001 0010 xxxx xxxx xxxx 0101 xxxx :Q */
|
|
/* QDADD : cccc 0001 0100 xxxx xxxx xxxx 0101 xxxx :Q */
|
|
/* QDSUB : cccc 0001 0110 xxxx xxxx xxxx 0101 xxxx :Q */
|
|
if ((insn & 0x0f9000f0) == 0x01000050)
|
|
return prep_emulate_rd12rn16rm0_wflags(insn, asi);
|
|
|
|
/* BKPT : 1110 0001 0010 xxxx xxxx xxxx 0111 xxxx */
|
|
/* SMC : cccc 0001 0110 xxxx xxxx xxxx 0111 xxxx */
|
|
|
|
/* Other instruction encodings aren't yet defined */
|
|
return INSN_REJECTED;
|
|
}
|
|
|
|
/* cccc 0000 xxxx xxxx xxxx xxxx xxxx 1001 xxxx */
|
|
else if ((insn & 0x0f0000f0) == 0x00000090) {
|
|
|
|
/* MUL : cccc 0000 0000 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* MULS : cccc 0000 0001 xxxx xxxx xxxx 1001 xxxx :cc */
|
|
/* MLA : cccc 0000 0010 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* MLAS : cccc 0000 0011 xxxx xxxx xxxx 1001 xxxx :cc */
|
|
/* UMAAL : cccc 0000 0100 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* undef : cccc 0000 0101 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* MLS : cccc 0000 0110 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* undef : cccc 0000 0111 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* UMULL : cccc 0000 1000 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* UMULLS : cccc 0000 1001 xxxx xxxx xxxx 1001 xxxx :cc */
|
|
/* UMLAL : cccc 0000 1010 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* UMLALS : cccc 0000 1011 xxxx xxxx xxxx 1001 xxxx :cc */
|
|
/* SMULL : cccc 0000 1100 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* SMULLS : cccc 0000 1101 xxxx xxxx xxxx 1001 xxxx :cc */
|
|
/* SMLAL : cccc 0000 1110 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* SMLALS : cccc 0000 1111 xxxx xxxx xxxx 1001 xxxx :cc */
|
|
if ((insn & 0x00d00000) == 0x00500000)
|
|
return INSN_REJECTED;
|
|
else if ((insn & 0x00e00000) == 0x00000000)
|
|
return prep_emulate_rd16rs8rm0_wflags(insn, asi);
|
|
else if ((insn & 0x00a00000) == 0x00200000)
|
|
return prep_emulate_rd16rn12rs8rm0_wflags(insn, asi);
|
|
else
|
|
return prep_emulate_rdhi16rdlo12rs8rm0_wflags(insn,
|
|
asi);
|
|
}
|
|
|
|
/* cccc 000x xxxx xxxx xxxx xxxx xxxx 1xx1 xxxx */
|
|
else if ((insn & 0x0e000090) == 0x00000090) {
|
|
|
|
/* SWP : cccc 0001 0000 xxxx xxxx xxxx 1001 xxxx */
|
|
/* SWPB : cccc 0001 0100 xxxx xxxx xxxx 1001 xxxx */
|
|
/* ??? : cccc 0001 0x01 xxxx xxxx xxxx 1001 xxxx */
|
|
/* ??? : cccc 0001 0x10 xxxx xxxx xxxx 1001 xxxx */
|
|
/* ??? : cccc 0001 0x11 xxxx xxxx xxxx 1001 xxxx */
|
|
/* STREX : cccc 0001 1000 xxxx xxxx xxxx 1001 xxxx */
|
|
/* LDREX : cccc 0001 1001 xxxx xxxx xxxx 1001 xxxx */
|
|
/* STREXD: cccc 0001 1010 xxxx xxxx xxxx 1001 xxxx */
|
|
/* LDREXD: cccc 0001 1011 xxxx xxxx xxxx 1001 xxxx */
|
|
/* STREXB: cccc 0001 1100 xxxx xxxx xxxx 1001 xxxx */
|
|
/* LDREXB: cccc 0001 1101 xxxx xxxx xxxx 1001 xxxx */
|
|
/* STREXH: cccc 0001 1110 xxxx xxxx xxxx 1001 xxxx */
|
|
/* LDREXH: cccc 0001 1111 xxxx xxxx xxxx 1001 xxxx */
|
|
|
|
/* LDRD : cccc 000x xxx0 xxxx xxxx xxxx 1101 xxxx */
|
|
/* STRD : cccc 000x xxx0 xxxx xxxx xxxx 1111 xxxx */
|
|
/* LDRH : cccc 000x xxx1 xxxx xxxx xxxx 1011 xxxx */
|
|
/* STRH : cccc 000x xxx0 xxxx xxxx xxxx 1011 xxxx */
|
|
/* LDRSB : cccc 000x xxx1 xxxx xxxx xxxx 1101 xxxx */
|
|
/* LDRSH : cccc 000x xxx1 xxxx xxxx xxxx 1111 xxxx */
|
|
if ((insn & 0x0f0000f0) == 0x01000090) {
|
|
if ((insn & 0x0fb000f0) == 0x01000090) {
|
|
/* SWP/SWPB */
|
|
return prep_emulate_rd12rn16rm0_wflags(insn,
|
|
asi);
|
|
} else {
|
|
/* STREX/LDREX variants and unallocaed space */
|
|
return INSN_REJECTED;
|
|
}
|
|
|
|
} else if ((insn & 0x0e1000d0) == 0x00000d0) {
|
|
/* STRD/LDRD */
|
|
if ((insn & 0x0000e000) == 0x0000e000)
|
|
return INSN_REJECTED; /* Rd is LR or PC */
|
|
if (is_writeback(insn) && is_r15(insn, 16))
|
|
return INSN_REJECTED; /* Writeback to PC */
|
|
|
|
insn &= 0xfff00fff;
|
|
insn |= 0x00002000; /* Rn = r0, Rd = r2 */
|
|
if (!(insn & (1 << 22))) {
|
|
/* Register index */
|
|
insn &= ~0xf;
|
|
insn |= 1; /* Rm = r1 */
|
|
}
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler =
|
|
(insn & (1 << 5)) ? emulate_strd : emulate_ldrd;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
/* LDRH/STRH/LDRSB/LDRSH */
|
|
if (is_r15(insn, 12))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
return prep_emulate_ldr_str(insn, asi);
|
|
}
|
|
|
|
/* cccc 000x xxxx xxxx xxxx xxxx xxxx xxxx xxxx */
|
|
|
|
/*
|
|
* ALU op with S bit and Rd == 15 :
|
|
* cccc 000x xxx1 xxxx 1111 xxxx xxxx xxxx
|
|
*/
|
|
if ((insn & 0x0e10f000) == 0x0010f000)
|
|
return INSN_REJECTED;
|
|
|
|
/*
|
|
* "mov ip, sp" is the most common kprobe'd instruction by far.
|
|
* Check and optimize for it explicitly.
|
|
*/
|
|
if (insn == 0xe1a0c00d) {
|
|
asi->insn_handler = simulate_mov_ipsp;
|
|
return INSN_GOOD_NO_SLOT;
|
|
}
|
|
|
|
/*
|
|
* Data processing: Immediate-shift / Register-shift
|
|
* ALU op : cccc 000x xxxx xxxx xxxx xxxx xxxx xxxx
|
|
* CPY : cccc 0001 1010 xxxx xxxx 0000 0000 xxxx
|
|
* MOV : cccc 0001 101x xxxx xxxx xxxx xxxx xxxx
|
|
* *S (bit 20) updates condition codes
|
|
* ADC/SBC/RSC reads the C flag
|
|
*/
|
|
insn &= 0xfff00ff0; /* Rn = r0, Rd = r0 */
|
|
insn |= 0x00000001; /* Rm = r1 */
|
|
if (insn & 0x010) {
|
|
insn &= 0xfffff0ff; /* register shift */
|
|
insn |= 0x00000200; /* Rs = r2 */
|
|
}
|
|
asi->insn[0] = insn;
|
|
|
|
if ((insn & 0x0f900000) == 0x01100000) {
|
|
/*
|
|
* TST : cccc 0001 0001 xxxx xxxx xxxx xxxx xxxx
|
|
* TEQ : cccc 0001 0011 xxxx xxxx xxxx xxxx xxxx
|
|
* CMP : cccc 0001 0101 xxxx xxxx xxxx xxxx xxxx
|
|
* CMN : cccc 0001 0111 xxxx xxxx xxxx xxxx xxxx
|
|
*/
|
|
asi->insn_handler = emulate_alu_tests;
|
|
} else {
|
|
/* ALU ops which write to Rd */
|
|
asi->insn_handler = (insn & (1 << 20)) ? /* S-bit */
|
|
emulate_alu_rwflags : emulate_alu_rflags;
|
|
}
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_001x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* MOVW : cccc 0011 0000 xxxx xxxx xxxx xxxx xxxx */
|
|
/* MOVT : cccc 0011 0100 xxxx xxxx xxxx xxxx xxxx */
|
|
if ((insn & 0x0fb00000) == 0x03000000)
|
|
return prep_emulate_rd12_modify(insn, asi);
|
|
|
|
/* hints : cccc 0011 0010 0000 xxxx xxxx xxxx xxxx */
|
|
if ((insn & 0x0fff0000) == 0x03200000) {
|
|
unsigned op2 = insn & 0x000000ff;
|
|
if (op2 == 0x01 || op2 == 0x04) {
|
|
/* YIELD : cccc 0011 0010 0000 xxxx xxxx 0000 0001 */
|
|
/* SEV : cccc 0011 0010 0000 xxxx xxxx 0000 0100 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_none;
|
|
return INSN_GOOD;
|
|
} else if (op2 <= 0x03) {
|
|
/* NOP : cccc 0011 0010 0000 xxxx xxxx 0000 0000 */
|
|
/* WFE : cccc 0011 0010 0000 xxxx xxxx 0000 0010 */
|
|
/* WFI : cccc 0011 0010 0000 xxxx xxxx 0000 0011 */
|
|
/*
|
|
* We make WFE and WFI true NOPs to avoid stalls due
|
|
* to missing events whilst processing the probe.
|
|
*/
|
|
asi->insn_handler = emulate_nop;
|
|
return INSN_GOOD_NO_SLOT;
|
|
}
|
|
/* For DBG and unallocated hints it's safest to reject them */
|
|
return INSN_REJECTED;
|
|
}
|
|
|
|
/*
|
|
* MSR : cccc 0011 0x10 xxxx xxxx xxxx xxxx xxxx
|
|
* ALU op with S bit and Rd == 15 :
|
|
* cccc 001x xxx1 xxxx 1111 xxxx xxxx xxxx
|
|
*/
|
|
if ((insn & 0x0fb00000) == 0x03200000 || /* MSR */
|
|
(insn & 0x0e10f000) == 0x0210f000) /* ALU s-bit, R15 */
|
|
return INSN_REJECTED;
|
|
|
|
/*
|
|
* Data processing: 32-bit Immediate
|
|
* ALU op : cccc 001x xxxx xxxx xxxx xxxx xxxx xxxx
|
|
* MOV : cccc 0011 101x xxxx xxxx xxxx xxxx xxxx
|
|
* *S (bit 20) updates condition codes
|
|
* ADC/SBC/RSC reads the C flag
|
|
*/
|
|
insn &= 0xfff00fff; /* Rn = r0 and Rd = r0 */
|
|
asi->insn[0] = insn;
|
|
|
|
if ((insn & 0x0f900000) == 0x03100000) {
|
|
/*
|
|
* TST : cccc 0011 0001 xxxx xxxx xxxx xxxx xxxx
|
|
* TEQ : cccc 0011 0011 xxxx xxxx xxxx xxxx xxxx
|
|
* CMP : cccc 0011 0101 xxxx xxxx xxxx xxxx xxxx
|
|
* CMN : cccc 0011 0111 xxxx xxxx xxxx xxxx xxxx
|
|
*/
|
|
asi->insn_handler = emulate_alu_tests_imm;
|
|
} else {
|
|
/* ALU ops which write to Rd */
|
|
asi->insn_handler = (insn & (1 << 20)) ? /* S-bit */
|
|
emulate_alu_imm_rwflags : emulate_alu_imm_rflags;
|
|
}
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_0110__1(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* SEL : cccc 0110 1000 xxxx xxxx xxxx 1011 xxxx GE: !!! */
|
|
if ((insn & 0x0ff000f0) == 0x068000b0) {
|
|
if (is_r15(insn, 12))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
insn &= 0xfff00ff0; /* Rd = r0, Rn = r0 */
|
|
insn |= 0x00000001; /* Rm = r1 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_sel;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
/* SSAT : cccc 0110 101x xxxx xxxx xxxx xx01 xxxx :Q */
|
|
/* USAT : cccc 0110 111x xxxx xxxx xxxx xx01 xxxx :Q */
|
|
/* SSAT16 : cccc 0110 1010 xxxx xxxx xxxx 0011 xxxx :Q */
|
|
/* USAT16 : cccc 0110 1110 xxxx xxxx xxxx 0011 xxxx :Q */
|
|
if ((insn & 0x0fa00030) == 0x06a00010 ||
|
|
(insn & 0x0fb000f0) == 0x06a00030) {
|
|
if (is_r15(insn, 12))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
insn &= 0xffff0ff0; /* Rd = r0, Rm = r0 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_sat;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
/* REV : cccc 0110 1011 xxxx xxxx xxxx 0011 xxxx */
|
|
/* REV16 : cccc 0110 1011 xxxx xxxx xxxx 1011 xxxx */
|
|
/* RBIT : cccc 0110 1111 xxxx xxxx xxxx 0011 xxxx */
|
|
/* REVSH : cccc 0110 1111 xxxx xxxx xxxx 1011 xxxx */
|
|
if ((insn & 0x0ff00070) == 0x06b00030 ||
|
|
(insn & 0x0ff00070) == 0x06f00030)
|
|
return prep_emulate_rd12rm0(insn, asi);
|
|
|
|
/* ??? : cccc 0110 0000 xxxx xxxx xxxx xxx1 xxxx : */
|
|
/* SADD16 : cccc 0110 0001 xxxx xxxx xxxx 0001 xxxx :GE */
|
|
/* SADDSUBX : cccc 0110 0001 xxxx xxxx xxxx 0011 xxxx :GE */
|
|
/* SSUBADDX : cccc 0110 0001 xxxx xxxx xxxx 0101 xxxx :GE */
|
|
/* SSUB16 : cccc 0110 0001 xxxx xxxx xxxx 0111 xxxx :GE */
|
|
/* SADD8 : cccc 0110 0001 xxxx xxxx xxxx 1001 xxxx :GE */
|
|
/* ??? : cccc 0110 0001 xxxx xxxx xxxx 1011 xxxx : */
|
|
/* ??? : cccc 0110 0001 xxxx xxxx xxxx 1101 xxxx : */
|
|
/* SSUB8 : cccc 0110 0001 xxxx xxxx xxxx 1111 xxxx :GE */
|
|
/* QADD16 : cccc 0110 0010 xxxx xxxx xxxx 0001 xxxx : */
|
|
/* QADDSUBX : cccc 0110 0010 xxxx xxxx xxxx 0011 xxxx : */
|
|
/* QSUBADDX : cccc 0110 0010 xxxx xxxx xxxx 0101 xxxx : */
|
|
/* QSUB16 : cccc 0110 0010 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* QADD8 : cccc 0110 0010 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* ??? : cccc 0110 0010 xxxx xxxx xxxx 1011 xxxx : */
|
|
/* ??? : cccc 0110 0010 xxxx xxxx xxxx 1101 xxxx : */
|
|
/* QSUB8 : cccc 0110 0010 xxxx xxxx xxxx 1111 xxxx : */
|
|
/* SHADD16 : cccc 0110 0011 xxxx xxxx xxxx 0001 xxxx : */
|
|
/* SHADDSUBX : cccc 0110 0011 xxxx xxxx xxxx 0011 xxxx : */
|
|
/* SHSUBADDX : cccc 0110 0011 xxxx xxxx xxxx 0101 xxxx : */
|
|
/* SHSUB16 : cccc 0110 0011 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* SHADD8 : cccc 0110 0011 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* ??? : cccc 0110 0011 xxxx xxxx xxxx 1011 xxxx : */
|
|
/* ??? : cccc 0110 0011 xxxx xxxx xxxx 1101 xxxx : */
|
|
/* SHSUB8 : cccc 0110 0011 xxxx xxxx xxxx 1111 xxxx : */
|
|
/* ??? : cccc 0110 0100 xxxx xxxx xxxx xxx1 xxxx : */
|
|
/* UADD16 : cccc 0110 0101 xxxx xxxx xxxx 0001 xxxx :GE */
|
|
/* UADDSUBX : cccc 0110 0101 xxxx xxxx xxxx 0011 xxxx :GE */
|
|
/* USUBADDX : cccc 0110 0101 xxxx xxxx xxxx 0101 xxxx :GE */
|
|
/* USUB16 : cccc 0110 0101 xxxx xxxx xxxx 0111 xxxx :GE */
|
|
/* UADD8 : cccc 0110 0101 xxxx xxxx xxxx 1001 xxxx :GE */
|
|
/* ??? : cccc 0110 0101 xxxx xxxx xxxx 1011 xxxx : */
|
|
/* ??? : cccc 0110 0101 xxxx xxxx xxxx 1101 xxxx : */
|
|
/* USUB8 : cccc 0110 0101 xxxx xxxx xxxx 1111 xxxx :GE */
|
|
/* UQADD16 : cccc 0110 0110 xxxx xxxx xxxx 0001 xxxx : */
|
|
/* UQADDSUBX : cccc 0110 0110 xxxx xxxx xxxx 0011 xxxx : */
|
|
/* UQSUBADDX : cccc 0110 0110 xxxx xxxx xxxx 0101 xxxx : */
|
|
/* UQSUB16 : cccc 0110 0110 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* UQADD8 : cccc 0110 0110 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* ??? : cccc 0110 0110 xxxx xxxx xxxx 1011 xxxx : */
|
|
/* ??? : cccc 0110 0110 xxxx xxxx xxxx 1101 xxxx : */
|
|
/* UQSUB8 : cccc 0110 0110 xxxx xxxx xxxx 1111 xxxx : */
|
|
/* UHADD16 : cccc 0110 0111 xxxx xxxx xxxx 0001 xxxx : */
|
|
/* UHADDSUBX : cccc 0110 0111 xxxx xxxx xxxx 0011 xxxx : */
|
|
/* UHSUBADDX : cccc 0110 0111 xxxx xxxx xxxx 0101 xxxx : */
|
|
/* UHSUB16 : cccc 0110 0111 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* UHADD8 : cccc 0110 0111 xxxx xxxx xxxx 1001 xxxx : */
|
|
/* ??? : cccc 0110 0111 xxxx xxxx xxxx 1011 xxxx : */
|
|
/* ??? : cccc 0110 0111 xxxx xxxx xxxx 1101 xxxx : */
|
|
/* UHSUB8 : cccc 0110 0111 xxxx xxxx xxxx 1111 xxxx : */
|
|
if ((insn & 0x0f800010) == 0x06000010) {
|
|
if ((insn & 0x00300000) == 0x00000000 ||
|
|
(insn & 0x000000e0) == 0x000000a0 ||
|
|
(insn & 0x000000e0) == 0x000000c0)
|
|
return INSN_REJECTED; /* Unallocated space */
|
|
return prep_emulate_rd12rn16rm0_wflags(insn, asi);
|
|
}
|
|
|
|
/* PKHBT : cccc 0110 1000 xxxx xxxx xxxx x001 xxxx : */
|
|
/* PKHTB : cccc 0110 1000 xxxx xxxx xxxx x101 xxxx : */
|
|
if ((insn & 0x0ff00030) == 0x06800010)
|
|
return prep_emulate_rd12rn16rm0_wflags(insn, asi);
|
|
|
|
/* SXTAB16 : cccc 0110 1000 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* SXTB16 : cccc 0110 1000 1111 xxxx xxxx 0111 xxxx : */
|
|
/* ??? : cccc 0110 1001 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* SXTAB : cccc 0110 1010 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* SXTB : cccc 0110 1010 1111 xxxx xxxx 0111 xxxx : */
|
|
/* SXTAH : cccc 0110 1011 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* SXTH : cccc 0110 1011 1111 xxxx xxxx 0111 xxxx : */
|
|
/* UXTAB16 : cccc 0110 1100 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* UXTB16 : cccc 0110 1100 1111 xxxx xxxx 0111 xxxx : */
|
|
/* ??? : cccc 0110 1101 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* UXTAB : cccc 0110 1110 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* UXTB : cccc 0110 1110 1111 xxxx xxxx 0111 xxxx : */
|
|
/* UXTAH : cccc 0110 1111 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* UXTH : cccc 0110 1111 1111 xxxx xxxx 0111 xxxx : */
|
|
if ((insn & 0x0f8000f0) == 0x06800070) {
|
|
if ((insn & 0x00300000) == 0x00100000)
|
|
return INSN_REJECTED; /* Unallocated space */
|
|
|
|
if ((insn & 0x000f0000) == 0x000f0000)
|
|
return prep_emulate_rd12rm0(insn, asi);
|
|
else
|
|
return prep_emulate_rd12rn16rm0_wflags(insn, asi);
|
|
}
|
|
|
|
/* Other instruction encodings aren't yet defined */
|
|
return INSN_REJECTED;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_0111__1(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* Undef : cccc 0111 1111 xxxx xxxx xxxx 1111 xxxx */
|
|
if ((insn & 0x0ff000f0) == 0x03f000f0)
|
|
return INSN_REJECTED;
|
|
|
|
/* SMLALD : cccc 0111 0100 xxxx xxxx xxxx 00x1 xxxx */
|
|
/* SMLSLD : cccc 0111 0100 xxxx xxxx xxxx 01x1 xxxx */
|
|
if ((insn & 0x0ff00090) == 0x07400010)
|
|
return prep_emulate_rdhi16rdlo12rs8rm0_wflags(insn, asi);
|
|
|
|
/* SMLAD : cccc 0111 0000 xxxx xxxx xxxx 00x1 xxxx :Q */
|
|
/* SMUAD : cccc 0111 0000 xxxx 1111 xxxx 00x1 xxxx :Q */
|
|
/* SMLSD : cccc 0111 0000 xxxx xxxx xxxx 01x1 xxxx :Q */
|
|
/* SMUSD : cccc 0111 0000 xxxx 1111 xxxx 01x1 xxxx : */
|
|
/* SMMLA : cccc 0111 0101 xxxx xxxx xxxx 00x1 xxxx : */
|
|
/* SMMUL : cccc 0111 0101 xxxx 1111 xxxx 00x1 xxxx : */
|
|
/* USADA8 : cccc 0111 1000 xxxx xxxx xxxx 0001 xxxx : */
|
|
/* USAD8 : cccc 0111 1000 xxxx 1111 xxxx 0001 xxxx : */
|
|
if ((insn & 0x0ff00090) == 0x07000010 ||
|
|
(insn & 0x0ff000d0) == 0x07500010 ||
|
|
(insn & 0x0ff000f0) == 0x07800010) {
|
|
|
|
if ((insn & 0x0000f000) == 0x0000f000)
|
|
return prep_emulate_rd16rs8rm0_wflags(insn, asi);
|
|
else
|
|
return prep_emulate_rd16rn12rs8rm0_wflags(insn, asi);
|
|
}
|
|
|
|
/* SMMLS : cccc 0111 0101 xxxx xxxx xxxx 11x1 xxxx : */
|
|
if ((insn & 0x0ff000d0) == 0x075000d0)
|
|
return prep_emulate_rd16rn12rs8rm0_wflags(insn, asi);
|
|
|
|
/* SBFX : cccc 0111 101x xxxx xxxx xxxx x101 xxxx : */
|
|
/* UBFX : cccc 0111 111x xxxx xxxx xxxx x101 xxxx : */
|
|
if ((insn & 0x0fa00070) == 0x07a00050)
|
|
return prep_emulate_rd12rm0(insn, asi);
|
|
|
|
/* BFI : cccc 0111 110x xxxx xxxx xxxx x001 xxxx : */
|
|
/* BFC : cccc 0111 110x xxxx xxxx xxxx x001 1111 : */
|
|
if ((insn & 0x0fe00070) == 0x07c00010) {
|
|
|
|
if ((insn & 0x0000000f) == 0x0000000f)
|
|
return prep_emulate_rd12_modify(insn, asi);
|
|
else
|
|
return prep_emulate_rd12rn0_modify(insn, asi);
|
|
}
|
|
|
|
return INSN_REJECTED;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_01xx(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* LDR : cccc 01xx x0x1 xxxx xxxx xxxx xxxx xxxx */
|
|
/* LDRB : cccc 01xx x1x1 xxxx xxxx xxxx xxxx xxxx */
|
|
/* LDRBT : cccc 01x0 x111 xxxx xxxx xxxx xxxx xxxx */
|
|
/* LDRT : cccc 01x0 x011 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STR : cccc 01xx x0x0 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STRB : cccc 01xx x1x0 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STRBT : cccc 01x0 x110 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STRT : cccc 01x0 x010 xxxx xxxx xxxx xxxx xxxx */
|
|
|
|
if ((insn & 0x00500000) == 0x00500000 && is_r15(insn, 12))
|
|
return INSN_REJECTED; /* LDRB into PC */
|
|
|
|
return prep_emulate_ldr_str(insn, asi);
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_100x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* LDM(2) : cccc 100x x101 xxxx 0xxx xxxx xxxx xxxx */
|
|
/* LDM(3) : cccc 100x x1x1 xxxx 1xxx xxxx xxxx xxxx */
|
|
if ((insn & 0x0e708000) == 0x85000000 ||
|
|
(insn & 0x0e508000) == 0x85010000)
|
|
return INSN_REJECTED;
|
|
|
|
/* LDM(1) : cccc 100x x0x1 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STM(1) : cccc 100x x0x0 xxxx xxxx xxxx xxxx xxxx */
|
|
|
|
/*
|
|
* Make the instruction unconditional because the new emulation
|
|
* functions don't bother to setup the PSR context.
|
|
*/
|
|
insn = (insn | 0xe0000000) & ~0x10000000;
|
|
return kprobe_decode_ldmstm(insn, asi);
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_101x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* B : cccc 1010 xxxx xxxx xxxx xxxx xxxx xxxx */
|
|
/* BL : cccc 1011 xxxx xxxx xxxx xxxx xxxx xxxx */
|
|
asi->insn_handler = simulate_bbl;
|
|
return INSN_GOOD_NO_SLOT;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_11xx(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* Coprocessor instructions... */
|
|
/* MCRR : cccc 1100 0100 xxxx xxxx xxxx xxxx xxxx : (Rd!=Rn) */
|
|
/* MRRC : cccc 1100 0101 xxxx xxxx xxxx xxxx xxxx : (Rd!=Rn) */
|
|
/* LDC : cccc 110x xxx1 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STC : cccc 110x xxx0 xxxx xxxx xxxx xxxx xxxx */
|
|
/* CDP : cccc 1110 xxxx xxxx xxxx xxxx xxx0 xxxx */
|
|
/* MCR : cccc 1110 xxx0 xxxx xxxx xxxx xxx1 xxxx */
|
|
/* MRC : cccc 1110 xxx1 xxxx xxxx xxxx xxx1 xxxx */
|
|
|
|
/* SVC : cccc 1111 xxxx xxxx xxxx xxxx xxxx xxxx */
|
|
|
|
return INSN_REJECTED;
|
|
}
|
|
|
|
static void __kprobes arm_singlestep(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
regs->ARM_pc += 4;
|
|
p->ainsn.insn_handler(p, regs);
|
|
}
|
|
|
|
/* Return:
|
|
* INSN_REJECTED If instruction is one not allowed to kprobe,
|
|
* INSN_GOOD If instruction is supported and uses instruction slot,
|
|
* INSN_GOOD_NO_SLOT If instruction is supported but doesn't use its slot.
|
|
*
|
|
* For instructions we don't want to kprobe (INSN_REJECTED return result):
|
|
* These are generally ones that modify the processor state making
|
|
* them "hard" to simulate such as switches processor modes or
|
|
* make accesses in alternate modes. Any of these could be simulated
|
|
* if the work was put into it, but low return considering they
|
|
* should also be very rare.
|
|
*/
|
|
enum kprobe_insn __kprobes
|
|
arm_kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
asi->insn_singlestep = arm_singlestep;
|
|
asi->insn_check_cc = kprobe_condition_checks[insn>>28];
|
|
asi->insn[1] = KPROBE_RETURN_INSTRUCTION;
|
|
|
|
if ((insn & 0xf0000000) == 0xf0000000)
|
|
|
|
return kprobe_decode_insn(insn, asi, arm_1111_table, false);
|
|
|
|
else if ((insn & 0x0e000000) == 0x00000000)
|
|
|
|
return space_cccc_000x(insn, asi);
|
|
|
|
else if ((insn & 0x0e000000) == 0x02000000)
|
|
|
|
return space_cccc_001x(insn, asi);
|
|
|
|
else if ((insn & 0x0f000010) == 0x06000010)
|
|
|
|
return space_cccc_0110__1(insn, asi);
|
|
|
|
else if ((insn & 0x0f000010) == 0x07000010)
|
|
|
|
return space_cccc_0111__1(insn, asi);
|
|
|
|
else if ((insn & 0x0c000000) == 0x04000000)
|
|
|
|
return space_cccc_01xx(insn, asi);
|
|
|
|
else if ((insn & 0x0e000000) == 0x08000000)
|
|
|
|
return space_cccc_100x(insn, asi);
|
|
|
|
else if ((insn & 0x0e000000) == 0x0a000000)
|
|
|
|
return space_cccc_101x(insn, asi);
|
|
|
|
return space_cccc_11xx(insn, asi);
|
|
}
|