mirror of
https://github.com/torvalds/linux.git
synced 2024-11-12 15:11:50 +00:00
0ebe25f90c
From: Bin Yang <bin.yang@marvell.com> Cc: stable@kernel.org Signed-off-by: Bin Yang <bin.yang@marvell.com> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
1531 lines
47 KiB
C
1531 lines
47 KiB
C
/*
|
|
* arch/arm/kernel/kprobes-decode.c
|
|
*
|
|
* Copyright (C) 2006, 2007 Motorola Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*/
|
|
|
|
/*
|
|
* We do not have hardware single-stepping on ARM, This
|
|
* effort is further complicated by the ARM not having a
|
|
* "next PC" register. Instructions that change the PC
|
|
* can't be safely single-stepped in a MP environment, so
|
|
* we have a lot of work to do:
|
|
*
|
|
* In the prepare phase:
|
|
* *) If it is an instruction that does anything
|
|
* with the CPU mode, we reject it for a kprobe.
|
|
* (This is out of laziness rather than need. The
|
|
* instructions could be simulated.)
|
|
*
|
|
* *) Otherwise, decode the instruction rewriting its
|
|
* registers to take fixed, ordered registers and
|
|
* setting a handler for it to run the instruction.
|
|
*
|
|
* In the execution phase by an instruction's handler:
|
|
*
|
|
* *) If the PC is written to by the instruction, the
|
|
* instruction must be fully simulated in software.
|
|
* If it is a conditional instruction, the handler
|
|
* will use insn[0] to copy its condition code to
|
|
* set r0 to 1 and insn[1] to "mov pc, lr" to return.
|
|
*
|
|
* *) Otherwise, a modified form of the instruction is
|
|
* directly executed. Its handler calls the
|
|
* instruction in insn[0]. In insn[1] is a
|
|
* "mov pc, lr" to return.
|
|
*
|
|
* Before calling, load up the reordered registers
|
|
* from the original instruction's registers. If one
|
|
* of the original input registers is the PC, compute
|
|
* and adjust the appropriate input register.
|
|
*
|
|
* After call completes, copy the output registers to
|
|
* the original instruction's original registers.
|
|
*
|
|
* We don't use a real breakpoint instruction since that
|
|
* would have us in the kernel go from SVC mode to SVC
|
|
* mode losing the link register. Instead we use an
|
|
* undefined instruction. To simplify processing, the
|
|
* undefined instruction used for kprobes must be reserved
|
|
* exclusively for kprobes use.
|
|
*
|
|
* TODO: ifdef out some instruction decoding based on architecture.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/kprobes.h>
|
|
|
|
#define sign_extend(x, signbit) ((x) | (0 - ((x) & (1 << (signbit)))))
|
|
|
|
#define branch_displacement(insn) sign_extend(((insn) & 0xffffff) << 2, 25)
|
|
|
|
#define PSR_fs (PSR_f|PSR_s)
|
|
|
|
#define KPROBE_RETURN_INSTRUCTION 0xe1a0f00e /* mov pc, lr */
|
|
#define SET_R0_TRUE_INSTRUCTION 0xe3a00001 /* mov r0, #1 */
|
|
|
|
#define truecc_insn(insn) (((insn) & 0xf0000000) | \
|
|
(SET_R0_TRUE_INSTRUCTION & 0x0fffffff))
|
|
|
|
typedef long (insn_0arg_fn_t)(void);
|
|
typedef long (insn_1arg_fn_t)(long);
|
|
typedef long (insn_2arg_fn_t)(long, long);
|
|
typedef long (insn_3arg_fn_t)(long, long, long);
|
|
typedef long (insn_4arg_fn_t)(long, long, long, long);
|
|
typedef long long (insn_llret_0arg_fn_t)(void);
|
|
typedef long long (insn_llret_3arg_fn_t)(long, long, long);
|
|
typedef long long (insn_llret_4arg_fn_t)(long, long, long, long);
|
|
|
|
union reg_pair {
|
|
long long dr;
|
|
#ifdef __LITTLE_ENDIAN
|
|
struct { long r0, r1; };
|
|
#else
|
|
struct { long r1, r0; };
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* For STR and STM instructions, an ARM core may choose to use either
|
|
* a +8 or a +12 displacement from the current instruction's address.
|
|
* Whichever value is chosen for a given core, it must be the same for
|
|
* both instructions and may not change. This function measures it.
|
|
*/
|
|
|
|
static int str_pc_offset;
|
|
|
|
static void __init find_str_pc_offset(void)
|
|
{
|
|
int addr, scratch, ret;
|
|
|
|
__asm__ (
|
|
"sub %[ret], pc, #4 \n\t"
|
|
"str pc, %[addr] \n\t"
|
|
"ldr %[scr], %[addr] \n\t"
|
|
"sub %[ret], %[scr], %[ret] \n\t"
|
|
: [ret] "=r" (ret), [scr] "=r" (scratch), [addr] "+m" (addr));
|
|
|
|
str_pc_offset = ret;
|
|
}
|
|
|
|
/*
|
|
* The insnslot_?arg_r[w]flags() functions below are to keep the
|
|
* msr -> *fn -> mrs instruction sequences indivisible so that
|
|
* the state of the CPSR flags aren't inadvertently modified
|
|
* just before or just after the call.
|
|
*/
|
|
|
|
static inline long __kprobes
|
|
insnslot_0arg_rflags(long cpsr, insn_0arg_fn_t *fn)
|
|
{
|
|
register long ret asm("r0");
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[cpsr] \n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[fn] \n\t"
|
|
: "=r" (ret)
|
|
: [cpsr] "r" (cpsr), [fn] "r" (fn)
|
|
: "lr", "cc"
|
|
);
|
|
return ret;
|
|
}
|
|
|
|
static inline long long __kprobes
|
|
insnslot_llret_0arg_rflags(long cpsr, insn_llret_0arg_fn_t *fn)
|
|
{
|
|
register long ret0 asm("r0");
|
|
register long ret1 asm("r1");
|
|
union reg_pair fnr;
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[cpsr] \n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[fn] \n\t"
|
|
: "=r" (ret0), "=r" (ret1)
|
|
: [cpsr] "r" (cpsr), [fn] "r" (fn)
|
|
: "lr", "cc"
|
|
);
|
|
fnr.r0 = ret0;
|
|
fnr.r1 = ret1;
|
|
return fnr.dr;
|
|
}
|
|
|
|
static inline long __kprobes
|
|
insnslot_1arg_rflags(long r0, long cpsr, insn_1arg_fn_t *fn)
|
|
{
|
|
register long rr0 asm("r0") = r0;
|
|
register long ret asm("r0");
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[cpsr] \n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[fn] \n\t"
|
|
: "=r" (ret)
|
|
: "0" (rr0), [cpsr] "r" (cpsr), [fn] "r" (fn)
|
|
: "lr", "cc"
|
|
);
|
|
return ret;
|
|
}
|
|
|
|
static inline long __kprobes
|
|
insnslot_2arg_rflags(long r0, long r1, long cpsr, insn_2arg_fn_t *fn)
|
|
{
|
|
register long rr0 asm("r0") = r0;
|
|
register long rr1 asm("r1") = r1;
|
|
register long ret asm("r0");
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[cpsr] \n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[fn] \n\t"
|
|
: "=r" (ret)
|
|
: "0" (rr0), "r" (rr1),
|
|
[cpsr] "r" (cpsr), [fn] "r" (fn)
|
|
: "lr", "cc"
|
|
);
|
|
return ret;
|
|
}
|
|
|
|
static inline long __kprobes
|
|
insnslot_3arg_rflags(long r0, long r1, long r2, long cpsr, insn_3arg_fn_t *fn)
|
|
{
|
|
register long rr0 asm("r0") = r0;
|
|
register long rr1 asm("r1") = r1;
|
|
register long rr2 asm("r2") = r2;
|
|
register long ret asm("r0");
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[cpsr] \n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[fn] \n\t"
|
|
: "=r" (ret)
|
|
: "0" (rr0), "r" (rr1), "r" (rr2),
|
|
[cpsr] "r" (cpsr), [fn] "r" (fn)
|
|
: "lr", "cc"
|
|
);
|
|
return ret;
|
|
}
|
|
|
|
static inline long long __kprobes
|
|
insnslot_llret_3arg_rflags(long r0, long r1, long r2, long cpsr,
|
|
insn_llret_3arg_fn_t *fn)
|
|
{
|
|
register long rr0 asm("r0") = r0;
|
|
register long rr1 asm("r1") = r1;
|
|
register long rr2 asm("r2") = r2;
|
|
register long ret0 asm("r0");
|
|
register long ret1 asm("r1");
|
|
union reg_pair fnr;
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[cpsr] \n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[fn] \n\t"
|
|
: "=r" (ret0), "=r" (ret1)
|
|
: "0" (rr0), "r" (rr1), "r" (rr2),
|
|
[cpsr] "r" (cpsr), [fn] "r" (fn)
|
|
: "lr", "cc"
|
|
);
|
|
fnr.r0 = ret0;
|
|
fnr.r1 = ret1;
|
|
return fnr.dr;
|
|
}
|
|
|
|
static inline long __kprobes
|
|
insnslot_4arg_rflags(long r0, long r1, long r2, long r3, long cpsr,
|
|
insn_4arg_fn_t *fn)
|
|
{
|
|
register long rr0 asm("r0") = r0;
|
|
register long rr1 asm("r1") = r1;
|
|
register long rr2 asm("r2") = r2;
|
|
register long rr3 asm("r3") = r3;
|
|
register long ret asm("r0");
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[cpsr] \n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[fn] \n\t"
|
|
: "=r" (ret)
|
|
: "0" (rr0), "r" (rr1), "r" (rr2), "r" (rr3),
|
|
[cpsr] "r" (cpsr), [fn] "r" (fn)
|
|
: "lr", "cc"
|
|
);
|
|
return ret;
|
|
}
|
|
|
|
static inline long __kprobes
|
|
insnslot_1arg_rwflags(long r0, long *cpsr, insn_1arg_fn_t *fn)
|
|
{
|
|
register long rr0 asm("r0") = r0;
|
|
register long ret asm("r0");
|
|
long oldcpsr = *cpsr;
|
|
long newcpsr;
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[oldcpsr] \n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[fn] \n\t"
|
|
"mrs %[newcpsr], cpsr \n\t"
|
|
: "=r" (ret), [newcpsr] "=r" (newcpsr)
|
|
: "0" (rr0), [oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
|
|
: "lr", "cc"
|
|
);
|
|
*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
|
|
return ret;
|
|
}
|
|
|
|
static inline long __kprobes
|
|
insnslot_2arg_rwflags(long r0, long r1, long *cpsr, insn_2arg_fn_t *fn)
|
|
{
|
|
register long rr0 asm("r0") = r0;
|
|
register long rr1 asm("r1") = r1;
|
|
register long ret asm("r0");
|
|
long oldcpsr = *cpsr;
|
|
long newcpsr;
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[oldcpsr] \n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[fn] \n\t"
|
|
"mrs %[newcpsr], cpsr \n\t"
|
|
: "=r" (ret), [newcpsr] "=r" (newcpsr)
|
|
: "0" (rr0), "r" (rr1), [oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
|
|
: "lr", "cc"
|
|
);
|
|
*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
|
|
return ret;
|
|
}
|
|
|
|
static inline long __kprobes
|
|
insnslot_3arg_rwflags(long r0, long r1, long r2, long *cpsr,
|
|
insn_3arg_fn_t *fn)
|
|
{
|
|
register long rr0 asm("r0") = r0;
|
|
register long rr1 asm("r1") = r1;
|
|
register long rr2 asm("r2") = r2;
|
|
register long ret asm("r0");
|
|
long oldcpsr = *cpsr;
|
|
long newcpsr;
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[oldcpsr] \n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[fn] \n\t"
|
|
"mrs %[newcpsr], cpsr \n\t"
|
|
: "=r" (ret), [newcpsr] "=r" (newcpsr)
|
|
: "0" (rr0), "r" (rr1), "r" (rr2),
|
|
[oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
|
|
: "lr", "cc"
|
|
);
|
|
*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
|
|
return ret;
|
|
}
|
|
|
|
static inline long __kprobes
|
|
insnslot_4arg_rwflags(long r0, long r1, long r2, long r3, long *cpsr,
|
|
insn_4arg_fn_t *fn)
|
|
{
|
|
register long rr0 asm("r0") = r0;
|
|
register long rr1 asm("r1") = r1;
|
|
register long rr2 asm("r2") = r2;
|
|
register long rr3 asm("r3") = r3;
|
|
register long ret asm("r0");
|
|
long oldcpsr = *cpsr;
|
|
long newcpsr;
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[oldcpsr] \n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[fn] \n\t"
|
|
"mrs %[newcpsr], cpsr \n\t"
|
|
: "=r" (ret), [newcpsr] "=r" (newcpsr)
|
|
: "0" (rr0), "r" (rr1), "r" (rr2), "r" (rr3),
|
|
[oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
|
|
: "lr", "cc"
|
|
);
|
|
*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
|
|
return ret;
|
|
}
|
|
|
|
static inline long long __kprobes
|
|
insnslot_llret_4arg_rwflags(long r0, long r1, long r2, long r3, long *cpsr,
|
|
insn_llret_4arg_fn_t *fn)
|
|
{
|
|
register long rr0 asm("r0") = r0;
|
|
register long rr1 asm("r1") = r1;
|
|
register long rr2 asm("r2") = r2;
|
|
register long rr3 asm("r3") = r3;
|
|
register long ret0 asm("r0");
|
|
register long ret1 asm("r1");
|
|
long oldcpsr = *cpsr;
|
|
long newcpsr;
|
|
union reg_pair fnr;
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[oldcpsr] \n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[fn] \n\t"
|
|
"mrs %[newcpsr], cpsr \n\t"
|
|
: "=r" (ret0), "=r" (ret1), [newcpsr] "=r" (newcpsr)
|
|
: "0" (rr0), "r" (rr1), "r" (rr2), "r" (rr3),
|
|
[oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
|
|
: "lr", "cc"
|
|
);
|
|
*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
|
|
fnr.r0 = ret0;
|
|
fnr.r1 = ret1;
|
|
return fnr.dr;
|
|
}
|
|
|
|
/*
|
|
* To avoid the complications of mimicing single-stepping on a
|
|
* processor without a Next-PC or a single-step mode, and to
|
|
* avoid having to deal with the side-effects of boosting, we
|
|
* simulate or emulate (almost) all ARM instructions.
|
|
*
|
|
* "Simulation" is where the instruction's behavior is duplicated in
|
|
* C code. "Emulation" is where the original instruction is rewritten
|
|
* and executed, often by altering its registers.
|
|
*
|
|
* By having all behavior of the kprobe'd instruction completed before
|
|
* returning from the kprobe_handler(), all locks (scheduler and
|
|
* interrupt) can safely be released. There is no need for secondary
|
|
* breakpoints, no race with MP or preemptable kernels, nor having to
|
|
* clean up resources counts at a later time impacting overall system
|
|
* performance. By rewriting the instruction, only the minimum registers
|
|
* need to be loaded and saved back optimizing performance.
|
|
*
|
|
* Calling the insnslot_*_rwflags version of a function doesn't hurt
|
|
* anything even when the CPSR flags aren't updated by the
|
|
* instruction. It's just a little slower in return for saving
|
|
* a little space by not having a duplicate function that doesn't
|
|
* update the flags. (The same optimization can be said for
|
|
* instructions that do or don't perform register writeback)
|
|
* Also, instructions can either read the flags, only write the
|
|
* flags, or read and write the flags. To save combinations
|
|
* rather than for sheer performance, flag functions just assume
|
|
* read and write of flags.
|
|
*/
|
|
|
|
static void __kprobes simulate_bbl(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;
|
|
long iaddr = (long)p->addr;
|
|
int disp = branch_displacement(insn);
|
|
|
|
if (!insnslot_1arg_rflags(0, regs->ARM_cpsr, i_fn))
|
|
return;
|
|
|
|
if (insn & (1 << 24))
|
|
regs->ARM_lr = iaddr + 4;
|
|
|
|
regs->ARM_pc = iaddr + 8 + disp;
|
|
}
|
|
|
|
static void __kprobes simulate_blx1(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long iaddr = (long)p->addr;
|
|
int disp = branch_displacement(insn);
|
|
|
|
regs->ARM_lr = iaddr + 4;
|
|
regs->ARM_pc = iaddr + 8 + disp + ((insn >> 23) & 0x2);
|
|
regs->ARM_cpsr |= PSR_T_BIT;
|
|
}
|
|
|
|
static void __kprobes simulate_blx2bx(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 rm = insn & 0xf;
|
|
long rmv = regs->uregs[rm];
|
|
|
|
if (!insnslot_1arg_rflags(0, regs->ARM_cpsr, i_fn))
|
|
return;
|
|
|
|
if (insn & (1 << 5))
|
|
regs->ARM_lr = (long)p->addr + 4;
|
|
|
|
regs->ARM_pc = rmv & ~0x1;
|
|
regs->ARM_cpsr &= ~PSR_T_BIT;
|
|
if (rmv & 0x1)
|
|
regs->ARM_cpsr |= PSR_T_BIT;
|
|
}
|
|
|
|
static void __kprobes simulate_ldm1stm1(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;
|
|
int lbit = insn & (1 << 20);
|
|
int wbit = insn & (1 << 21);
|
|
int ubit = insn & (1 << 23);
|
|
int pbit = insn & (1 << 24);
|
|
long *addr = (long *)regs->uregs[rn];
|
|
int reg_bit_vector;
|
|
int reg_count;
|
|
|
|
if (!insnslot_1arg_rflags(0, regs->ARM_cpsr, i_fn))
|
|
return;
|
|
|
|
reg_count = 0;
|
|
reg_bit_vector = insn & 0xffff;
|
|
while (reg_bit_vector) {
|
|
reg_bit_vector &= (reg_bit_vector - 1);
|
|
++reg_count;
|
|
}
|
|
|
|
if (!ubit)
|
|
addr -= reg_count;
|
|
addr += (!pbit == !ubit);
|
|
|
|
reg_bit_vector = insn & 0xffff;
|
|
while (reg_bit_vector) {
|
|
int reg = __ffs(reg_bit_vector);
|
|
reg_bit_vector &= (reg_bit_vector - 1);
|
|
if (lbit)
|
|
regs->uregs[reg] = *addr++;
|
|
else
|
|
*addr++ = regs->uregs[reg];
|
|
}
|
|
|
|
if (wbit) {
|
|
if (!ubit)
|
|
addr -= reg_count;
|
|
addr -= (!pbit == !ubit);
|
|
regs->uregs[rn] = (long)addr;
|
|
}
|
|
}
|
|
|
|
static void __kprobes simulate_stm1_pc(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
|
|
if (!insnslot_1arg_rflags(0, regs->ARM_cpsr, i_fn))
|
|
return;
|
|
|
|
regs->ARM_pc = (long)p->addr + str_pc_offset;
|
|
simulate_ldm1stm1(p, regs);
|
|
regs->ARM_pc = (long)p->addr + 4;
|
|
}
|
|
|
|
static void __kprobes simulate_mov_ipsp(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
regs->uregs[12] = regs->uregs[13];
|
|
}
|
|
|
|
static void __kprobes emulate_ldcstc(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 = regs->uregs[rn];
|
|
|
|
/* Save Rn in case of writeback. */
|
|
regs->uregs[rn] = insnslot_1arg_rflags(rnv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
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;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf; /* rm may be invalid, don't care. */
|
|
|
|
/* 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" (regs->uregs[rn]),
|
|
[rd0] "=m" (regs->uregs[rd]),
|
|
[rd1] "=m" (regs->uregs[rd+1])
|
|
: [rm] "m" (regs->uregs[rm]),
|
|
[cpsr] "r" (regs->ARM_cpsr),
|
|
[i_fn] "r" (i_fn)
|
|
: "r0", "r1", "r2", "r3", "lr", "cc"
|
|
);
|
|
}
|
|
|
|
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;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rnv = regs->uregs[rn];
|
|
long rmv = regs->uregs[rm]; /* rm/rmv may be invalid, don't care. */
|
|
|
|
regs->uregs[rn] = insnslot_4arg_rflags(rnv, rmv, regs->uregs[rd],
|
|
regs->uregs[rd+1],
|
|
regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
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);
|
|
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. */
|
|
|
|
/* Save Rn in case of writeback. */
|
|
regs->uregs[rn] =
|
|
insnslot_3arg_rflags(rnv, rdv, rmv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes emulate_mrrc(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_llret_0arg_fn_t *i_fn = (insn_llret_0arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
union reg_pair fnr;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
|
|
fnr.dr = insnslot_llret_0arg_rflags(regs->ARM_cpsr, i_fn);
|
|
regs->uregs[rn] = fnr.r0;
|
|
regs->uregs[rd] = fnr.r1;
|
|
}
|
|
|
|
static void __kprobes emulate_mcrr(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;
|
|
long rnv = regs->uregs[rn];
|
|
long rdv = regs->uregs[rd];
|
|
|
|
insnslot_2arg_rflags(rnv, rdv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
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_rd12(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_0arg_fn_t *i_fn = (insn_0arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
|
|
regs->uregs[rd] = insnslot_0arg_rflags(regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes emulate_ird12(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 ird = (insn >> 12) & 0xf;
|
|
|
|
insnslot_1arg_rflags(regs->uregs[ird], regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes emulate_rn16(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 = regs->uregs[rn];
|
|
|
|
insnslot_1arg_rflags(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_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 enum kprobe_insn __kprobes
|
|
prep_emulate_ldr_str(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
int ibit = (insn & (1 << 26)) ? 25 : 22;
|
|
|
|
insn &= 0xfff00fff;
|
|
insn |= 0x00001000; /* Rn = r0, Rd = r1 */
|
|
if (insn & (1 << ibit)) {
|
|
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_rd12rm0(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
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_rd12(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
insn &= 0xffff0fff; /* Rd = r0 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd12;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd12rn16rm0_wflags(kprobe_opcode_t insn,
|
|
struct arch_specific_insn *asi)
|
|
{
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
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 enum kprobe_insn __kprobes
|
|
space_1111(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* CPS mmod == 1 : 1111 0001 0000 xx10 xxxx xxxx xx0x xxxx */
|
|
/* RFE : 1111 100x x0x1 xxxx xxxx 1010 xxxx xxxx */
|
|
/* SRS : 1111 100x x1x0 1101 xxxx 0101 xxxx xxxx */
|
|
if ((insn & 0xfff30020) == 0xf1020000 ||
|
|
(insn & 0xfe500f00) == 0xf8100a00 ||
|
|
(insn & 0xfe5f0f00) == 0xf84d0500)
|
|
return INSN_REJECTED;
|
|
|
|
/* PLD : 1111 01x1 x101 xxxx xxxx xxxx xxxx xxxx : */
|
|
if ((insn & 0xfd700000) == 0xf4500000) {
|
|
insn &= 0xfff0ffff; /* Rn = r0 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rn16;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
/* BLX(1) : 1111 101x xxxx xxxx xxxx xxxx xxxx xxxx : */
|
|
if ((insn & 0xfe000000) == 0xfa000000) {
|
|
asi->insn_handler = simulate_blx1;
|
|
return INSN_GOOD_NO_SLOT;
|
|
}
|
|
|
|
/* SETEND : 1111 0001 0000 0001 xxxx xxxx 0000 xxxx */
|
|
/* CDP2 : 1111 1110 xxxx xxxx xxxx xxxx xxx0 xxxx */
|
|
if ((insn & 0xffff00f0) == 0xf1010000 ||
|
|
(insn & 0xff000010) == 0xfe000000) {
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_none;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
/* MCRR2 : 1111 1100 0100 xxxx xxxx xxxx xxxx xxxx : (Rd != Rn) */
|
|
/* MRRC2 : 1111 1100 0101 xxxx xxxx xxxx xxxx xxxx : (Rd != Rn) */
|
|
if ((insn & 0xffe00000) == 0xfc400000) {
|
|
insn &= 0xfff00fff; /* Rn = r0 */
|
|
insn |= 0x00001000; /* Rd = r1 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler =
|
|
(insn & (1 << 20)) ? emulate_mrrc : emulate_mcrr;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
/* LDC2 : 1111 110x xxx1 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STC2 : 1111 110x xxx0 xxxx xxxx xxxx xxxx xxxx */
|
|
if ((insn & 0xfe000000) == 0xfc000000) {
|
|
insn &= 0xfff0ffff; /* Rn = r0 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_ldcstc;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
/* MCR2 : 1111 1110 xxx0 xxxx xxxx xxxx xxx1 xxxx */
|
|
/* MRC2 : 1111 1110 xxx1 xxxx xxxx xxxx xxx1 xxxx */
|
|
insn &= 0xffff0fff; /* Rd = r0 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = (insn & (1 << 20)) ? emulate_rd12 : emulate_ird12;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
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) {
|
|
|
|
/* BXJ : cccc 0001 0010 xxxx xxxx xxxx 0010 xxxx */
|
|
/* MSR : cccc 0001 0x10 xxxx xxxx xxxx 0000 xxxx */
|
|
if ((insn & 0x0ff000f0) == 0x01200020 ||
|
|
(insn & 0x0fb000f0) == 0x01200000)
|
|
return INSN_REJECTED;
|
|
|
|
/* MRS : cccc 0001 0x00 xxxx xxxx xxxx 0000 xxxx */
|
|
if ((insn & 0x0fb00010) == 0x01000000)
|
|
return prep_emulate_rd12(insn, asi);
|
|
|
|
/* 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 0x00 xxxx : Q */
|
|
return prep_emulate_rd16rn12rs8rm0_wflags(insn, asi);
|
|
|
|
}
|
|
|
|
/* cccc 0001 0xx0 xxxx xxxx xxxx xxxx 0xx1 xxxx */
|
|
else if ((insn & 0x0f900090) == 0x01000010) {
|
|
|
|
/* BKPT : 1110 0001 0010 xxxx xxxx xxxx 0111 xxxx */
|
|
if ((insn & 0xfff000f0) == 0xe1200070)
|
|
return INSN_REJECTED;
|
|
|
|
/* BLX(2) : cccc 0001 0010 xxxx xxxx xxxx 0011 xxxx */
|
|
/* BX : cccc 0001 0010 xxxx xxxx xxxx 0001 xxxx */
|
|
if ((insn & 0x0ff000d0) == 0x01200010) {
|
|
asi->insn[0] = truecc_insn(insn);
|
|
asi->insn_handler = simulate_blx2bx;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
/* 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 */
|
|
return prep_emulate_rd12rn16rm0_wflags(insn, asi);
|
|
}
|
|
|
|
/* cccc 0000 xxxx xxxx xxxx xxxx xxxx 1001 xxxx */
|
|
else if ((insn & 0x0f000090) == 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 : */
|
|
/* 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 & 0x0fe000f0) == 0x00000090) {
|
|
return prep_emulate_rd16rs8rm0_wflags(insn, asi);
|
|
} else if ((insn & 0x0fe000f0) == 0x00200090) {
|
|
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 */
|
|
/* LDRD : cccc 000x xxx0 xxxx xxxx xxxx 1101 xxxx */
|
|
/* STRD : cccc 000x xxx0 xxxx xxxx xxxx 1111 xxxx */
|
|
/* STREX : cccc 0001 1000 xxxx xxxx xxxx 1001 xxxx */
|
|
/* LDREX : cccc 0001 1001 xxxx xxxx xxxx 1001 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 & 0x0fb000f0) == 0x01000090) {
|
|
/* SWP/SWPB */
|
|
return prep_emulate_rd12rn16rm0_wflags(insn, asi);
|
|
} else if ((insn & 0x0e1000d0) == 0x00000d0) {
|
|
/* STRD/LDRD */
|
|
insn &= 0xfff00fff;
|
|
insn |= 0x00002000; /* Rn = r0, Rd = r2 */
|
|
if (insn & (1 << 22)) {
|
|
/* I bit */
|
|
insn &= ~0xf;
|
|
insn |= 1; /* Rm = r1 */
|
|
}
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler =
|
|
(insn & (1 << 5)) ? emulate_strd : emulate_ldrd;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
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;
|
|
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)
|
|
{
|
|
/*
|
|
* MSR : cccc 0011 0x10 xxxx xxxx xxxx xxxx xxxx
|
|
* Undef : cccc 0011 0x00 xxxx xxxx xxxx xxxx xxxx
|
|
* ALU op with S bit and Rd == 15 :
|
|
* cccc 001x xxx1 xxxx 1111 xxxx xxxx xxxx
|
|
*/
|
|
if ((insn & 0x0f900000) == 0x03200000 || /* MSR & Undef */
|
|
(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, Rd = r0 */
|
|
asi->insn[0] = insn;
|
|
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) {
|
|
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) {
|
|
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 */
|
|
/* REVSH : cccc 0110 1111 xxxx xxxx xxxx 1011 xxxx */
|
|
if ((insn & 0x0ff00070) == 0x06b00030 ||
|
|
(insn & 0x0ff000f0) == 0x06f000b0)
|
|
return prep_emulate_rd12rm0(insn, asi);
|
|
|
|
/* 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 */
|
|
/* 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 : */
|
|
/* 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 : */
|
|
/* SHSUB8 : cccc 0110 0011 xxxx xxxx xxxx 1111 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 */
|
|
/* 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 : */
|
|
/* 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 : */
|
|
/* UHSUB8 : cccc 0110 0111 xxxx xxxx xxxx 1111 xxxx : */
|
|
/* PKHBT : cccc 0110 1000 xxxx xxxx xxxx x001 xxxx : */
|
|
/* PKHTB : cccc 0110 1000 xxxx xxxx xxxx x101 xxxx : */
|
|
/* SXTAB16 : cccc 0110 1000 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* SXTB : cccc 0110 1010 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* SXTAB : cccc 0110 1010 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* SXTAH : cccc 0110 1011 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* UXTAB16 : cccc 0110 1100 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* UXTAB : cccc 0110 1110 xxxx xxxx xxxx 0111 xxxx : */
|
|
/* UXTAH : cccc 0110 1111 xxxx xxxx xxxx 0111 xxxx : */
|
|
return prep_emulate_rd12rn16rm0_wflags(insn, asi);
|
|
}
|
|
|
|
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;
|
|
|
|
/* USADA8 : cccc 0111 1000 xxxx xxxx xxxx 0001 xxxx */
|
|
/* USAD8 : cccc 0111 1000 xxxx 1111 xxxx 0001 xxxx */
|
|
if ((insn & 0x0ff000f0) == 0x07800010)
|
|
return prep_emulate_rd16rn12rs8rm0_wflags(insn, asi);
|
|
|
|
/* 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 */
|
|
/* SMLSD : cccc 0111 0000 xxxx xxxx xxxx 01x1 xxxx :Q */
|
|
/* SMMLA : cccc 0111 0101 xxxx xxxx xxxx 00x1 xxxx : */
|
|
/* SMMLS : cccc 0111 0101 xxxx xxxx xxxx 11x1 xxxx : */
|
|
if ((insn & 0x0ff00090) == 0x07000010 ||
|
|
(insn & 0x0ff000d0) == 0x07500010 ||
|
|
(insn & 0x0ff000d0) == 0x075000d0)
|
|
return prep_emulate_rd16rn12rs8rm0_wflags(insn, asi);
|
|
|
|
/* SMUSD : cccc 0111 0000 xxxx xxxx xxxx 01x1 xxxx : */
|
|
/* SMUAD : cccc 0111 0000 xxxx 1111 xxxx 00x1 xxxx :Q */
|
|
/* SMMUL : cccc 0111 0101 xxxx 1111 xxxx 00x1 xxxx : */
|
|
return prep_emulate_rd16rs8rm0_wflags(insn, asi);
|
|
}
|
|
|
|
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 */
|
|
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 */
|
|
asi->insn[0] = truecc_insn(insn);
|
|
asi->insn_handler = ((insn & 0x108000) == 0x008000) ? /* STM & R15 */
|
|
simulate_stm1_pc : simulate_ldm1stm1;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
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[0] = truecc_insn(insn);
|
|
asi->insn_handler = simulate_bbl;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_1100_010x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* MCRR : cccc 1100 0100 xxxx xxxx xxxx xxxx xxxx : (Rd!=Rn) */
|
|
/* MRRC : cccc 1100 0101 xxxx xxxx xxxx xxxx xxxx : (Rd!=Rn) */
|
|
insn &= 0xfff00fff;
|
|
insn |= 0x00001000; /* Rn = r0, Rd = r1 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = (insn & (1 << 20)) ? emulate_mrrc : emulate_mcrr;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_110x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* LDC : cccc 110x xxx1 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STC : cccc 110x xxx0 xxxx xxxx xxxx xxxx xxxx */
|
|
insn &= 0xfff0ffff; /* Rn = r0 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_ldcstc;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_111x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* BKPT : 1110 0001 0010 xxxx xxxx xxxx 0111 xxxx */
|
|
/* SWI : cccc 1111 xxxx xxxx xxxx xxxx xxxx xxxx */
|
|
if ((insn & 0xfff000f0) == 0xe1200070 ||
|
|
(insn & 0x0f000000) == 0x0f000000)
|
|
return INSN_REJECTED;
|
|
|
|
/* CDP : cccc 1110 xxxx xxxx xxxx xxxx xxx0 xxxx */
|
|
if ((insn & 0x0f000010) == 0x0e000000) {
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_none;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
/* MCR : cccc 1110 xxx0 xxxx xxxx xxxx xxx1 xxxx */
|
|
/* MRC : cccc 1110 xxx1 xxxx xxxx xxxx xxx1 xxxx */
|
|
insn &= 0xffff0fff; /* Rd = r0 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = (insn & (1 << 20)) ? emulate_rd12 : emulate_ird12;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
/* 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[1] = KPROBE_RETURN_INSTRUCTION;
|
|
|
|
if ((insn & 0xf0000000) == 0xf0000000) {
|
|
|
|
return space_1111(insn, asi);
|
|
|
|
} 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);
|
|
|
|
} else if ((insn & 0x0fe00000) == 0x0c400000) {
|
|
|
|
return space_cccc_1100_010x(insn, asi);
|
|
|
|
} else if ((insn & 0x0e000000) == 0x0c400000) {
|
|
|
|
return space_cccc_110x(insn, asi);
|
|
|
|
}
|
|
|
|
return space_cccc_111x(insn, asi);
|
|
}
|
|
|
|
void __init arm_kprobe_decode_init(void)
|
|
{
|
|
find_str_pc_offset();
|
|
}
|
|
|
|
|
|
/*
|
|
* All ARM instructions listed below.
|
|
*
|
|
* Instructions and their general purpose registers are given.
|
|
* If a particular register may not use R15, it is prefixed with a "!".
|
|
* If marked with a "*" means the value returned by reading R15
|
|
* is implementation defined.
|
|
*
|
|
* ADC/ADD/AND/BIC/CMN/CMP/EOR/MOV/MVN/ORR/RSB/RSC/SBC/SUB/TEQ
|
|
* TST: Rd, Rn, Rm, !Rs
|
|
* BX: Rm
|
|
* BLX(2): !Rm
|
|
* BX: Rm (R15 legal, but discouraged)
|
|
* BXJ: !Rm,
|
|
* CLZ: !Rd, !Rm
|
|
* CPY: Rd, Rm
|
|
* LDC/2,STC/2 immediate offset & unindex: Rn
|
|
* LDC/2,STC/2 immediate pre/post-indexed: !Rn
|
|
* LDM(1/3): !Rn, register_list
|
|
* LDM(2): !Rn, !register_list
|
|
* LDR,STR,PLD immediate offset: Rd, Rn
|
|
* LDR,STR,PLD register offset: Rd, Rn, !Rm
|
|
* LDR,STR,PLD scaled register offset: Rd, !Rn, !Rm
|
|
* LDR,STR immediate pre/post-indexed: Rd, !Rn
|
|
* LDR,STR register pre/post-indexed: Rd, !Rn, !Rm
|
|
* LDR,STR scaled register pre/post-indexed: Rd, !Rn, !Rm
|
|
* LDRB,STRB immediate offset: !Rd, Rn
|
|
* LDRB,STRB register offset: !Rd, Rn, !Rm
|
|
* LDRB,STRB scaled register offset: !Rd, !Rn, !Rm
|
|
* LDRB,STRB immediate pre/post-indexed: !Rd, !Rn
|
|
* LDRB,STRB register pre/post-indexed: !Rd, !Rn, !Rm
|
|
* LDRB,STRB scaled register pre/post-indexed: !Rd, !Rn, !Rm
|
|
* LDRT,LDRBT,STRBT immediate pre/post-indexed: !Rd, !Rn
|
|
* LDRT,LDRBT,STRBT register pre/post-indexed: !Rd, !Rn, !Rm
|
|
* LDRT,LDRBT,STRBT scaled register pre/post-indexed: !Rd, !Rn, !Rm
|
|
* LDRH/SH/SB/D,STRH/SH/SB/D immediate offset: !Rd, Rn
|
|
* LDRH/SH/SB/D,STRH/SH/SB/D register offset: !Rd, Rn, !Rm
|
|
* LDRH/SH/SB/D,STRH/SH/SB/D immediate pre/post-indexed: !Rd, !Rn
|
|
* LDRH/SH/SB/D,STRH/SH/SB/D register pre/post-indexed: !Rd, !Rn, !Rm
|
|
* LDREX: !Rd, !Rn
|
|
* MCR/2: !Rd
|
|
* MCRR/2,MRRC/2: !Rd, !Rn
|
|
* MLA: !Rd, !Rn, !Rm, !Rs
|
|
* MOV: Rd
|
|
* MRC/2: !Rd (if Rd==15, only changes cond codes, not the register)
|
|
* MRS,MSR: !Rd
|
|
* MUL: !Rd, !Rm, !Rs
|
|
* PKH{BT,TB}: !Rd, !Rn, !Rm
|
|
* QDADD,[U]QADD/16/8/SUBX: !Rd, !Rm, !Rn
|
|
* QDSUB,[U]QSUB/16/8/ADDX: !Rd, !Rm, !Rn
|
|
* REV/16/SH: !Rd, !Rm
|
|
* RFE: !Rn
|
|
* {S,U}[H]ADD{16,8,SUBX},{S,U}[H]SUB{16,8,ADDX}: !Rd, !Rn, !Rm
|
|
* SEL: !Rd, !Rn, !Rm
|
|
* SMLA<x><y>,SMLA{D,W<y>},SMLSD,SMML{A,S}: !Rd, !Rn, !Rm, !Rs
|
|
* SMLAL<x><y>,SMLA{D,LD},SMLSLD,SMMULL,SMULW<y>: !RdHi, !RdLo, !Rm, !Rs
|
|
* SMMUL,SMUAD,SMUL<x><y>,SMUSD: !Rd, !Rm, !Rs
|
|
* SSAT/16: !Rd, !Rm
|
|
* STM(1/2): !Rn, register_list* (R15 in reg list not recommended)
|
|
* STRT immediate pre/post-indexed: Rd*, !Rn
|
|
* STRT register pre/post-indexed: Rd*, !Rn, !Rm
|
|
* STRT scaled register pre/post-indexed: Rd*, !Rn, !Rm
|
|
* STREX: !Rd, !Rn, !Rm
|
|
* SWP/B: !Rd, !Rn, !Rm
|
|
* {S,U}XTA{B,B16,H}: !Rd, !Rn, !Rm
|
|
* {S,U}XT{B,B16,H}: !Rd, !Rm
|
|
* UM{AA,LA,UL}L: !RdHi, !RdLo, !Rm, !Rs
|
|
* USA{D8,A8,T,T16}: !Rd, !Rm, !Rs
|
|
*
|
|
* May transfer control by writing R15 (possible mode changes or alternate
|
|
* mode accesses marked by "*"):
|
|
* ALU op (* with s-bit), B, BL, BKPT, BLX(1/2), BX, BXJ, CPS*, CPY,
|
|
* LDM(1), LDM(2/3)*, LDR, MOV, RFE*, SWI*
|
|
*
|
|
* Instructions that do not take general registers, nor transfer control:
|
|
* CDP/2, SETEND, SRS*
|
|
*/
|