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linux/arch/arm/kernel/kprobes-arm.c

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ARM kprobes: instruction single-stepping support This is the code implementing instruction single-stepping for kprobes on ARM. To get around the limitation of no Next-PC and no hardware single- stepping, all kprobe'd instructions are split into three camps: simulation, emulation, and rejected. "Simulated" instructions are those instructions which behavior is reproduced by straight C code. "Emulated" instructions are ones that are copied, slightly altered and executed directly in the instruction slot to reproduce their behavior. "Rejected" instructions are ones that could be simulated, but work hasn't been put into simulating them. These instructions should be very rare, if not unencountered, in the kernel. If ever needed, code could be added to simulate them. One might wonder why this and the ptrace singlestep facility are not sharing some code. Both approaches are fundamentally different because the ptrace code regains control after the stepped instruction by installing a breakpoint after the instruction itself, and possibly at the location where the instruction might be branching to, instead of simulating or emulating the target instruction. The ptrace approach isn't suitable for kprobes because the breakpoints would have to be moved back, and the icache flushed, everytime the probe is hit to let normal code execution resume, which would have a significant performance impact. It is also racy on SMP since another CPU could, with the right timing, sail through the probe point without being caught. Because ptrace single-stepping always result in a different process to be scheduled, the concern for performance is much less significant. On the other hand, the kprobes approach isn't (currently) suitable for ptrace because it has no provision for proper user space memory protection and translation, and even if that was implemented, the gain wouldn't be worth the added complexity in the ptrace path compared to the current approach. So, until kprobes does support user space, both kprobes and ptrace are best kept independent and separate. Signed-off-by: Quentin Barnes <qbarnes@gmail.com> Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com> Signed-off-by: Nicolas Pitre <nico@marvell.com>
2007-06-12 06:20:10 +08:00
/*
* 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.
*
* *) 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>
ARM: Move generic arm instruction parsing code to new files for sharing between features Move the arm version of the kprobes instruction parsing code into more generic files from where it can be used by uprobes and possibly other subsystems. The symbol names will be made more generic in a subsequent part of this patchset. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:16:10 +08:00
#include <linux/ptrace.h>
ARM kprobes: instruction single-stepping support This is the code implementing instruction single-stepping for kprobes on ARM. To get around the limitation of no Next-PC and no hardware single- stepping, all kprobe'd instructions are split into three camps: simulation, emulation, and rejected. "Simulated" instructions are those instructions which behavior is reproduced by straight C code. "Emulated" instructions are ones that are copied, slightly altered and executed directly in the instruction slot to reproduce their behavior. "Rejected" instructions are ones that could be simulated, but work hasn't been put into simulating them. These instructions should be very rare, if not unencountered, in the kernel. If ever needed, code could be added to simulate them. One might wonder why this and the ptrace singlestep facility are not sharing some code. Both approaches are fundamentally different because the ptrace code regains control after the stepped instruction by installing a breakpoint after the instruction itself, and possibly at the location where the instruction might be branching to, instead of simulating or emulating the target instruction. The ptrace approach isn't suitable for kprobes because the breakpoints would have to be moved back, and the icache flushed, everytime the probe is hit to let normal code execution resume, which would have a significant performance impact. It is also racy on SMP since another CPU could, with the right timing, sail through the probe point without being caught. Because ptrace single-stepping always result in a different process to be scheduled, the concern for performance is much less significant. On the other hand, the kprobes approach isn't (currently) suitable for ptrace because it has no provision for proper user space memory protection and translation, and even if that was implemented, the gain wouldn't be worth the added complexity in the ptrace path compared to the current approach. So, until kprobes does support user space, both kprobes and ptrace are best kept independent and separate. Signed-off-by: Quentin Barnes <qbarnes@gmail.com> Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com> Signed-off-by: Nicolas Pitre <nico@marvell.com>
2007-06-12 06:20:10 +08:00
ARM: kprobes: Split out internal parts of kprobes.h Later, we will be adding a considerable amount of internal implementation definitions to kprobe header files and it would be good to have these in local header file along side the source code, rather than pollute the existing header which is include by all users of kprobes. To this end, we add arch/arm/kernel/kprobes.h and move into this the existing internal defintions from arch/arm/include/asm/kprobes.h Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-20 17:52:38 +08:00
#include "kprobes.h"
ARM: Move generic arm instruction parsing code to new files for sharing between features Move the arm version of the kprobes instruction parsing code into more generic files from where it can be used by uprobes and possibly other subsystems. The symbol names will be made more generic in a subsequent part of this patchset. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:16:10 +08:00
#include "probes-arm.h"
ARM kprobes: instruction single-stepping support This is the code implementing instruction single-stepping for kprobes on ARM. To get around the limitation of no Next-PC and no hardware single- stepping, all kprobe'd instructions are split into three camps: simulation, emulation, and rejected. "Simulated" instructions are those instructions which behavior is reproduced by straight C code. "Emulated" instructions are ones that are copied, slightly altered and executed directly in the instruction slot to reproduce their behavior. "Rejected" instructions are ones that could be simulated, but work hasn't been put into simulating them. These instructions should be very rare, if not unencountered, in the kernel. If ever needed, code could be added to simulate them. One might wonder why this and the ptrace singlestep facility are not sharing some code. Both approaches are fundamentally different because the ptrace code regains control after the stepped instruction by installing a breakpoint after the instruction itself, and possibly at the location where the instruction might be branching to, instead of simulating or emulating the target instruction. The ptrace approach isn't suitable for kprobes because the breakpoints would have to be moved back, and the icache flushed, everytime the probe is hit to let normal code execution resume, which would have a significant performance impact. It is also racy on SMP since another CPU could, with the right timing, sail through the probe point without being caught. Because ptrace single-stepping always result in a different process to be scheduled, the concern for performance is much less significant. On the other hand, the kprobes approach isn't (currently) suitable for ptrace because it has no provision for proper user space memory protection and translation, and even if that was implemented, the gain wouldn't be worth the added complexity in the ptrace path compared to the current approach. So, until kprobes does support user space, both kprobes and ptrace are best kept independent and separate. Signed-off-by: Quentin Barnes <qbarnes@gmail.com> Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com> Signed-off-by: Nicolas Pitre <nico@marvell.com>
2007-06-12 06:20:10 +08:00
ARM: kprobes: Add BLX macro This is for use by inline assembler which will be added to kprobes-arm.c It saves memory when used on newer ARM architectures and also provides correct interworking should ARM probes be required on Thumb kernels in the future. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-07-07 21:03:08 +08:00
#if __LINUX_ARM_ARCH__ >= 6
#define BLX(reg) "blx "reg" \n\t"
#else
#define BLX(reg) "mov lr, pc \n\t" \
"mov pc, "reg" \n\t"
#endif
ARM: use a function table for determining instruction interpreter action Make the instruction interpreter call back to semantic action functions through a function pointer array provided by the invoker. The interpreter decodes the instructions into groups and uses the group number to index into the supplied array. kprobes and uprobes code will each supply their own array of functions. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-07 07:06:43 +08:00
static void __kprobes
ARM: Make the kprobes condition_check symbol names more generic In preparation for sharing the ARM kprobes instruction interpreting code with uprobes, make the symbols names less kprobes-specific. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:17:23 +08:00
emulate_ldrdstrd(probes_opcode_t insn,
ARM: Make arch_specific_insn a define for new arch_probes_insn structure Because the common underlying code for ARM kprobes and uprobes needs to share a common architecrure-specific context structure, and because the generic kprobes include file insists on defining this to a dummy structure when kprobes is not configured, a new common structure is required which can exist when uprobes is configured without kprobes. In this case kprobes will define a dummy structure, but without the define aliasing the two structure tags it will not affect uprobes and the shared probes code. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:41:29 +08:00
struct arch_probes_insn *asi, struct pt_regs *regs)
ARM: kprobes: Add emulate_ldrdstrd() This is an emulation function for the LDRD and STRD instructions. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-10 00:39:42 +08:00
{
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
unsigned long pc = regs->ARM_pc + 4;
ARM: kprobes: Add emulate_ldrdstrd() This is an emulation function for the LDRD and STRD instructions. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-10 00:39:42 +08:00
int rt = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
register unsigned long rtv asm("r0") = regs->uregs[rt];
register unsigned long rt2v asm("r1") = regs->uregs[rt+1];
register unsigned long rnv asm("r2") = (rn == 15) ? pc
: regs->uregs[rn];
register unsigned long rmv asm("r3") = regs->uregs[rm];
__asm__ __volatile__ (
BLX("%[fn]")
: "=r" (rtv), "=r" (rt2v), "=r" (rnv)
: "0" (rtv), "1" (rt2v), "2" (rnv), "r" (rmv),
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
[fn] "r" (asi->insn_fn)
ARM: kprobes: Add emulate_ldrdstrd() This is an emulation function for the LDRD and STRD instructions. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-10 00:39:42 +08:00
: "lr", "memory", "cc"
);
regs->uregs[rt] = rtv;
regs->uregs[rt+1] = rt2v;
if (is_writeback(insn))
regs->uregs[rn] = rnv;
}
ARM: use a function table for determining instruction interpreter action Make the instruction interpreter call back to semantic action functions through a function pointer array provided by the invoker. The interpreter decodes the instructions into groups and uses the group number to index into the supplied array. kprobes and uprobes code will each supply their own array of functions. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-07 07:06:43 +08:00
static void __kprobes
ARM: Make the kprobes condition_check symbol names more generic In preparation for sharing the ARM kprobes instruction interpreting code with uprobes, make the symbols names less kprobes-specific. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:17:23 +08:00
emulate_ldr(probes_opcode_t insn,
ARM: Make arch_specific_insn a define for new arch_probes_insn structure Because the common underlying code for ARM kprobes and uprobes needs to share a common architecrure-specific context structure, and because the generic kprobes include file insists on defining this to a dummy structure when kprobes is not configured, a new common structure is required which can exist when uprobes is configured without kprobes. In this case kprobes will define a dummy structure, but without the define aliasing the two structure tags it will not affect uprobes and the shared probes code. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:41:29 +08:00
struct arch_probes_insn *asi, struct pt_regs *regs)
ARM: kprobes: Add new versions of emulate_ldr() and emulate_str() These use the register calling conventions required by the new decoding table framework for calling simulated instructions. We rename the old versions of these functions to *_old for now. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-11 20:10:49 +08:00
{
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
unsigned long pc = regs->ARM_pc + 4;
ARM: kprobes: Add new versions of emulate_ldr() and emulate_str() These use the register calling conventions required by the new decoding table framework for calling simulated instructions. We rename the old versions of these functions to *_old for now. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-11 20:10:49 +08:00
int rt = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
register unsigned long rtv asm("r0");
register unsigned long rnv asm("r2") = (rn == 15) ? pc
: regs->uregs[rn];
register unsigned long rmv asm("r3") = regs->uregs[rm];
__asm__ __volatile__ (
BLX("%[fn]")
: "=r" (rtv), "=r" (rnv)
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
: "1" (rnv), "r" (rmv), [fn] "r" (asi->insn_fn)
ARM: kprobes: Add new versions of emulate_ldr() and emulate_str() These use the register calling conventions required by the new decoding table framework for calling simulated instructions. We rename the old versions of these functions to *_old for now. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-11 20:10:49 +08:00
: "lr", "memory", "cc"
);
if (rt == 15)
load_write_pc(rtv, regs);
else
regs->uregs[rt] = rtv;
if (is_writeback(insn))
regs->uregs[rn] = rnv;
}
ARM: use a function table for determining instruction interpreter action Make the instruction interpreter call back to semantic action functions through a function pointer array provided by the invoker. The interpreter decodes the instructions into groups and uses the group number to index into the supplied array. kprobes and uprobes code will each supply their own array of functions. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-07 07:06:43 +08:00
static void __kprobes
ARM: Make the kprobes condition_check symbol names more generic In preparation for sharing the ARM kprobes instruction interpreting code with uprobes, make the symbols names less kprobes-specific. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:17:23 +08:00
emulate_str(probes_opcode_t insn,
ARM: Make arch_specific_insn a define for new arch_probes_insn structure Because the common underlying code for ARM kprobes and uprobes needs to share a common architecrure-specific context structure, and because the generic kprobes include file insists on defining this to a dummy structure when kprobes is not configured, a new common structure is required which can exist when uprobes is configured without kprobes. In this case kprobes will define a dummy structure, but without the define aliasing the two structure tags it will not affect uprobes and the shared probes code. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:41:29 +08:00
struct arch_probes_insn *asi, struct pt_regs *regs)
ARM: kprobes: Add new versions of emulate_ldr() and emulate_str() These use the register calling conventions required by the new decoding table framework for calling simulated instructions. We rename the old versions of these functions to *_old for now. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-11 20:10:49 +08:00
{
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
unsigned long rtpc = regs->ARM_pc - 4 + str_pc_offset;
unsigned long rnpc = regs->ARM_pc + 4;
ARM: kprobes: Add new versions of emulate_ldr() and emulate_str() These use the register calling conventions required by the new decoding table framework for calling simulated instructions. We rename the old versions of these functions to *_old for now. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-11 20:10:49 +08:00
int rt = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
register unsigned long rtv asm("r0") = (rt == 15) ? rtpc
: regs->uregs[rt];
register unsigned long rnv asm("r2") = (rn == 15) ? rnpc
: regs->uregs[rn];
register unsigned long rmv asm("r3") = regs->uregs[rm];
__asm__ __volatile__ (
BLX("%[fn]")
: "=r" (rnv)
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
: "r" (rtv), "0" (rnv), "r" (rmv), [fn] "r" (asi->insn_fn)
ARM: kprobes: Add new versions of emulate_ldr() and emulate_str() These use the register calling conventions required by the new decoding table framework for calling simulated instructions. We rename the old versions of these functions to *_old for now. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-11 20:10:49 +08:00
: "lr", "memory", "cc"
);
if (is_writeback(insn))
regs->uregs[rn] = rnv;
}
ARM: use a function table for determining instruction interpreter action Make the instruction interpreter call back to semantic action functions through a function pointer array provided by the invoker. The interpreter decodes the instructions into groups and uses the group number to index into the supplied array. kprobes and uprobes code will each supply their own array of functions. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-07 07:06:43 +08:00
static void __kprobes
ARM: Make the kprobes condition_check symbol names more generic In preparation for sharing the ARM kprobes instruction interpreting code with uprobes, make the symbols names less kprobes-specific. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:17:23 +08:00
emulate_rd12rn16rm0rs8_rwflags(probes_opcode_t insn,
ARM: Make arch_specific_insn a define for new arch_probes_insn structure Because the common underlying code for ARM kprobes and uprobes needs to share a common architecrure-specific context structure, and because the generic kprobes include file insists on defining this to a dummy structure when kprobes is not configured, a new common structure is required which can exist when uprobes is configured without kprobes. In this case kprobes will define a dummy structure, but without the define aliasing the two structure tags it will not affect uprobes and the shared probes code. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:41:29 +08:00
struct arch_probes_insn *asi, struct pt_regs *regs)
ARM: kprobes: Add emulate_rd12rn16rm0rs8_rwflags() This is the emulation function for the instruction format used by the ARM data-processing instructions. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-10 00:35:36 +08:00
{
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
unsigned long pc = regs->ARM_pc + 4;
ARM: kprobes: Add emulate_rd12rn16rm0rs8_rwflags() This is the emulation function for the instruction format used by the ARM data-processing instructions. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-10 00:35:36 +08:00
int rd = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
int rs = (insn >> 8) & 0xf;
register unsigned long rdv asm("r0") = regs->uregs[rd];
register unsigned long rnv asm("r2") = (rn == 15) ? pc
: regs->uregs[rn];
register unsigned long rmv asm("r3") = (rm == 15) ? pc
: regs->uregs[rm];
register unsigned long rsv asm("r1") = regs->uregs[rs];
unsigned long cpsr = regs->ARM_cpsr;
__asm__ __volatile__ (
"msr cpsr_fs, %[cpsr] \n\t"
BLX("%[fn]")
"mrs %[cpsr], cpsr \n\t"
: "=r" (rdv), [cpsr] "=r" (cpsr)
: "0" (rdv), "r" (rnv), "r" (rmv), "r" (rsv),
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
"1" (cpsr), [fn] "r" (asi->insn_fn)
ARM: kprobes: Add emulate_rd12rn16rm0rs8_rwflags() This is the emulation function for the instruction format used by the ARM data-processing instructions. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-10 00:35:36 +08:00
: "lr", "memory", "cc"
);
if (rd == 15)
alu_write_pc(rdv, regs);
else
regs->uregs[rd] = rdv;
regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK);
}
ARM: use a function table for determining instruction interpreter action Make the instruction interpreter call back to semantic action functions through a function pointer array provided by the invoker. The interpreter decodes the instructions into groups and uses the group number to index into the supplied array. kprobes and uprobes code will each supply their own array of functions. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-07 07:06:43 +08:00
static void __kprobes
ARM: Make the kprobes condition_check symbol names more generic In preparation for sharing the ARM kprobes instruction interpreting code with uprobes, make the symbols names less kprobes-specific. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:17:23 +08:00
emulate_rd12rn16rm0_rwflags_nopc(probes_opcode_t insn,
ARM: Make arch_specific_insn a define for new arch_probes_insn structure Because the common underlying code for ARM kprobes and uprobes needs to share a common architecrure-specific context structure, and because the generic kprobes include file insists on defining this to a dummy structure when kprobes is not configured, a new common structure is required which can exist when uprobes is configured without kprobes. In this case kprobes will define a dummy structure, but without the define aliasing the two structure tags it will not affect uprobes and the shared probes code. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:41:29 +08:00
struct arch_probes_insn *asi, struct pt_regs *regs)
ARM: kprobes: Add emulate_rd12rn16rm0_rwflags_nopc() This is the emulation function for the instruction format used by the ARM media instructions. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-10 00:23:50 +08:00
{
int rd = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
register unsigned long rdv asm("r0") = regs->uregs[rd];
register unsigned long rnv asm("r2") = regs->uregs[rn];
register unsigned long rmv asm("r3") = regs->uregs[rm];
unsigned long cpsr = regs->ARM_cpsr;
__asm__ __volatile__ (
"msr cpsr_fs, %[cpsr] \n\t"
BLX("%[fn]")
"mrs %[cpsr], cpsr \n\t"
: "=r" (rdv), [cpsr] "=r" (cpsr)
: "0" (rdv), "r" (rnv), "r" (rmv),
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
"1" (cpsr), [fn] "r" (asi->insn_fn)
ARM: kprobes: Add emulate_rd12rn16rm0_rwflags_nopc() This is the emulation function for the instruction format used by the ARM media instructions. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-10 00:23:50 +08:00
: "lr", "memory", "cc"
);
regs->uregs[rd] = rdv;
regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK);
}
ARM: use a function table for determining instruction interpreter action Make the instruction interpreter call back to semantic action functions through a function pointer array provided by the invoker. The interpreter decodes the instructions into groups and uses the group number to index into the supplied array. kprobes and uprobes code will each supply their own array of functions. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-07 07:06:43 +08:00
static void __kprobes
ARM: Make the kprobes condition_check symbol names more generic In preparation for sharing the ARM kprobes instruction interpreting code with uprobes, make the symbols names less kprobes-specific. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:17:23 +08:00
emulate_rd16rn12rm0rs8_rwflags_nopc(probes_opcode_t insn,
ARM: Make arch_specific_insn a define for new arch_probes_insn structure Because the common underlying code for ARM kprobes and uprobes needs to share a common architecrure-specific context structure, and because the generic kprobes include file insists on defining this to a dummy structure when kprobes is not configured, a new common structure is required which can exist when uprobes is configured without kprobes. In this case kprobes will define a dummy structure, but without the define aliasing the two structure tags it will not affect uprobes and the shared probes code. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:41:29 +08:00
struct arch_probes_insn *asi,
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
struct pt_regs *regs)
ARM: kprobes: Add emulate_rd16rn12rm0rs8_rwflags_nopc() This is the emulation function for the instruction format used by the ARM multiply-accumulate instructions. These don't allow use of PC so we don't have to add special cases for this. This function is used to replace use of prep_emulate_rd16rs8rm0_wflags and prep_emulate_rd16rn12rs8rm0_wflags. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-11 00:35:51 +08:00
{
int rd = (insn >> 16) & 0xf;
int rn = (insn >> 12) & 0xf;
int rm = insn & 0xf;
int rs = (insn >> 8) & 0xf;
register unsigned long rdv asm("r2") = regs->uregs[rd];
register unsigned long rnv asm("r0") = regs->uregs[rn];
register unsigned long rmv asm("r3") = regs->uregs[rm];
register unsigned long rsv asm("r1") = regs->uregs[rs];
unsigned long cpsr = regs->ARM_cpsr;
__asm__ __volatile__ (
"msr cpsr_fs, %[cpsr] \n\t"
BLX("%[fn]")
"mrs %[cpsr], cpsr \n\t"
: "=r" (rdv), [cpsr] "=r" (cpsr)
: "0" (rdv), "r" (rnv), "r" (rmv), "r" (rsv),
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
"1" (cpsr), [fn] "r" (asi->insn_fn)
ARM: kprobes: Add emulate_rd16rn12rm0rs8_rwflags_nopc() This is the emulation function for the instruction format used by the ARM multiply-accumulate instructions. These don't allow use of PC so we don't have to add special cases for this. This function is used to replace use of prep_emulate_rd16rs8rm0_wflags and prep_emulate_rd16rn12rs8rm0_wflags. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-11 00:35:51 +08:00
: "lr", "memory", "cc"
);
regs->uregs[rd] = rdv;
regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK);
}
ARM: use a function table for determining instruction interpreter action Make the instruction interpreter call back to semantic action functions through a function pointer array provided by the invoker. The interpreter decodes the instructions into groups and uses the group number to index into the supplied array. kprobes and uprobes code will each supply their own array of functions. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-07 07:06:43 +08:00
static void __kprobes
ARM: Make the kprobes condition_check symbol names more generic In preparation for sharing the ARM kprobes instruction interpreting code with uprobes, make the symbols names less kprobes-specific. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:17:23 +08:00
emulate_rd12rm0_noflags_nopc(probes_opcode_t insn,
ARM: Make arch_specific_insn a define for new arch_probes_insn structure Because the common underlying code for ARM kprobes and uprobes needs to share a common architecrure-specific context structure, and because the generic kprobes include file insists on defining this to a dummy structure when kprobes is not configured, a new common structure is required which can exist when uprobes is configured without kprobes. In this case kprobes will define a dummy structure, but without the define aliasing the two structure tags it will not affect uprobes and the shared probes code. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:41:29 +08:00
struct arch_probes_insn *asi, struct pt_regs *regs)
ARM: kprobes: Add emulate_rd12rm0_noflags_nopc() This is the emulation function for the instruction format used by the ARM bit-field manipulation instructions. Various other instruction forms can also make use of this and it is used to replace use of prep_emulate_rd12{rm0}{_modify} Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-11 01:10:36 +08:00
{
int rd = (insn >> 12) & 0xf;
int rm = insn & 0xf;
register unsigned long rdv asm("r0") = regs->uregs[rd];
register unsigned long rmv asm("r3") = regs->uregs[rm];
__asm__ __volatile__ (
BLX("%[fn]")
: "=r" (rdv)
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
: "0" (rdv), "r" (rmv), [fn] "r" (asi->insn_fn)
ARM: kprobes: Add emulate_rd12rm0_noflags_nopc() This is the emulation function for the instruction format used by the ARM bit-field manipulation instructions. Various other instruction forms can also make use of this and it is used to replace use of prep_emulate_rd12{rm0}{_modify} Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-11 01:10:36 +08:00
: "lr", "memory", "cc"
);
regs->uregs[rd] = rdv;
}
ARM: use a function table for determining instruction interpreter action Make the instruction interpreter call back to semantic action functions through a function pointer array provided by the invoker. The interpreter decodes the instructions into groups and uses the group number to index into the supplied array. kprobes and uprobes code will each supply their own array of functions. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-07 07:06:43 +08:00
static void __kprobes
ARM: Make the kprobes condition_check symbol names more generic In preparation for sharing the ARM kprobes instruction interpreting code with uprobes, make the symbols names less kprobes-specific. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:17:23 +08:00
emulate_rdlo12rdhi16rn0rm8_rwflags_nopc(probes_opcode_t insn,
ARM: Make arch_specific_insn a define for new arch_probes_insn structure Because the common underlying code for ARM kprobes and uprobes needs to share a common architecrure-specific context structure, and because the generic kprobes include file insists on defining this to a dummy structure when kprobes is not configured, a new common structure is required which can exist when uprobes is configured without kprobes. In this case kprobes will define a dummy structure, but without the define aliasing the two structure tags it will not affect uprobes and the shared probes code. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:41:29 +08:00
struct arch_probes_insn *asi,
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
struct pt_regs *regs)
ARM: kprobes: Add emulate_rdlo12rdhi16rn0rm8_rwflags_nopc() This is the emulation function for the instruction format used by the ARM multiply long instructions. It replaces use of prep_emulate_rdhi16rdlo12rs8rm0_wflags(). Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-11 01:32:15 +08:00
{
int rdlo = (insn >> 12) & 0xf;
int rdhi = (insn >> 16) & 0xf;
int rn = insn & 0xf;
int rm = (insn >> 8) & 0xf;
register unsigned long rdlov asm("r0") = regs->uregs[rdlo];
register unsigned long rdhiv asm("r2") = regs->uregs[rdhi];
register unsigned long rnv asm("r3") = regs->uregs[rn];
register unsigned long rmv asm("r1") = regs->uregs[rm];
unsigned long cpsr = regs->ARM_cpsr;
__asm__ __volatile__ (
"msr cpsr_fs, %[cpsr] \n\t"
BLX("%[fn]")
"mrs %[cpsr], cpsr \n\t"
: "=r" (rdlov), "=r" (rdhiv), [cpsr] "=r" (cpsr)
: "0" (rdlov), "1" (rdhiv), "r" (rnv), "r" (rmv),
ARM: Remove use of struct kprobe from generic probes code Change the generic ARM probes code to pass in the opcode and architecture-specific structure separately instead of using struct kprobe, so we do not pollute code being used only for uprobes or other non-kprobes instruction interpretation. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-08 00:19:32 +08:00
"2" (cpsr), [fn] "r" (asi->insn_fn)
ARM: kprobes: Add emulate_rdlo12rdhi16rn0rm8_rwflags_nopc() This is the emulation function for the instruction format used by the ARM multiply long instructions. It replaces use of prep_emulate_rdhi16rdlo12rs8rm0_wflags(). Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-06-11 01:32:15 +08:00
: "lr", "memory", "cc"
);
regs->uregs[rdlo] = rdlov;
regs->uregs[rdhi] = rdhiv;
regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK);
}
ARM: use a function table for determining instruction interpreter action Make the instruction interpreter call back to semantic action functions through a function pointer array provided by the invoker. The interpreter decodes the instructions into groups and uses the group number to index into the supplied array. kprobes and uprobes code will each supply their own array of functions. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-07 07:06:43 +08:00
const union decode_action kprobes_arm_actions[NUM_PROBES_ARM_ACTIONS] = {
ARM: Change more ARM kprobes symbol names to something more generic Change kprobe_emulate_none, kprobe_simulate_nop, and arm_kprobe_decode_init function names to something more appropriate for code being shared outside of the kprobes subsystem. Also, move the new arm_probes_decode_init declaration out of the kprobes.h include file and into the probes.h include file. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:20:25 +08:00
[PROBES_EMULATE_NONE] = {.handler = probes_emulate_none},
[PROBES_SIMULATE_NOP] = {.handler = probes_simulate_nop},
[PROBES_PRELOAD_IMM] = {.handler = probes_simulate_nop},
[PROBES_PRELOAD_REG] = {.handler = probes_simulate_nop},
ARM: use a function table for determining instruction interpreter action Make the instruction interpreter call back to semantic action functions through a function pointer array provided by the invoker. The interpreter decodes the instructions into groups and uses the group number to index into the supplied array. kprobes and uprobes code will each supply their own array of functions. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-07 07:06:43 +08:00
[PROBES_BRANCH_IMM] = {.handler = simulate_blx1},
[PROBES_MRS] = {.handler = simulate_mrs},
[PROBES_BRANCH_REG] = {.handler = simulate_blx2bx},
[PROBES_CLZ] = {.handler = emulate_rd12rm0_noflags_nopc},
[PROBES_SATURATING_ARITHMETIC] = {
.handler = emulate_rd12rn16rm0_rwflags_nopc},
[PROBES_MUL1] = {.handler = emulate_rdlo12rdhi16rn0rm8_rwflags_nopc},
[PROBES_MUL2] = {.handler = emulate_rd16rn12rm0rs8_rwflags_nopc},
[PROBES_SWP] = {.handler = emulate_rd12rn16rm0_rwflags_nopc},
[PROBES_LDRSTRD] = {.handler = emulate_ldrdstrd},
[PROBES_LOAD_EXTRA] = {.handler = emulate_ldr},
[PROBES_LOAD] = {.handler = emulate_ldr},
[PROBES_STORE_EXTRA] = {.handler = emulate_str},
[PROBES_STORE] = {.handler = emulate_str},
[PROBES_MOV_IP_SP] = {.handler = simulate_mov_ipsp},
[PROBES_DATA_PROCESSING_REG] = {
.handler = emulate_rd12rn16rm0rs8_rwflags},
[PROBES_DATA_PROCESSING_IMM] = {
.handler = emulate_rd12rn16rm0rs8_rwflags},
[PROBES_MOV_HALFWORD] = {.handler = emulate_rd12rm0_noflags_nopc},
ARM: Change more ARM kprobes symbol names to something more generic Change kprobe_emulate_none, kprobe_simulate_nop, and arm_kprobe_decode_init function names to something more appropriate for code being shared outside of the kprobes subsystem. Also, move the new arm_probes_decode_init declaration out of the kprobes.h include file and into the probes.h include file. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-06 10:20:25 +08:00
[PROBES_SEV] = {.handler = probes_emulate_none},
[PROBES_WFE] = {.handler = probes_simulate_nop},
ARM: use a function table for determining instruction interpreter action Make the instruction interpreter call back to semantic action functions through a function pointer array provided by the invoker. The interpreter decodes the instructions into groups and uses the group number to index into the supplied array. kprobes and uprobes code will each supply their own array of functions. Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Jon Medhurst <tixy@linaro.org>
2014-03-07 07:06:43 +08:00
[PROBES_SATURATE] = {.handler = emulate_rd12rn16rm0_rwflags_nopc},
[PROBES_REV] = {.handler = emulate_rd12rm0_noflags_nopc},
[PROBES_MMI] = {.handler = emulate_rd12rn16rm0_rwflags_nopc},
[PROBES_PACK] = {.handler = emulate_rd12rn16rm0_rwflags_nopc},
[PROBES_EXTEND] = {.handler = emulate_rd12rm0_noflags_nopc},
[PROBES_EXTEND_ADD] = {.handler = emulate_rd12rn16rm0_rwflags_nopc},
[PROBES_MUL_ADD_LONG] = {
.handler = emulate_rdlo12rdhi16rn0rm8_rwflags_nopc},
[PROBES_MUL_ADD] = {.handler = emulate_rd16rn12rm0rs8_rwflags_nopc},
[PROBES_BITFIELD] = {.handler = emulate_rd12rm0_noflags_nopc},
[PROBES_BRANCH] = {.handler = simulate_bbl},
[PROBES_LDMSTM] = {.decoder = kprobe_decode_ldmstm}
};