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    Subject[PATCH v5 15/16] ARM: add uprobes support
    Date
    From: "David A. Long" <dave.long@linaro.org>

    Using Rabin Vincent's ARM uprobes patches as a base, enable uprobes
    support on ARM.

    Caveats:

    - Thumb is not supported

    Signed-off-by: David A. Long <dave.long@linaro.org>
    ---
    arch/arm/Kconfig | 4 +
    arch/arm/include/asm/ptrace.h | 6 +
    arch/arm/include/asm/thread_info.h | 5 +-
    arch/arm/include/asm/uprobes.h | 45 ++++++++
    arch/arm/kernel/Makefile | 1 +
    arch/arm/kernel/signal.c | 4 +
    arch/arm/kernel/uprobes-arm.c | 231 +++++++++++++++++++++++++++++++++++++
    arch/arm/kernel/uprobes.c | 208 +++++++++++++++++++++++++++++++++
    arch/arm/kernel/uprobes.h | 35 ++++++
    9 files changed, 538 insertions(+), 1 deletion(-)
    create mode 100644 arch/arm/include/asm/uprobes.h
    create mode 100644 arch/arm/kernel/uprobes-arm.c
    create mode 100644 arch/arm/kernel/uprobes.c
    create mode 100644 arch/arm/kernel/uprobes.h

    diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
    index c1f1a7e..fec5a6b 100644
    --- a/arch/arm/Kconfig
    +++ b/arch/arm/Kconfig
    @@ -203,6 +203,10 @@ config ZONE_DMA
    config NEED_DMA_MAP_STATE
    def_bool y

    +config ARCH_SUPPORTS_UPROBES
    + depends on KPROBES
    + def_bool y
    +
    config ARCH_HAS_DMA_SET_COHERENT_MASK
    bool

    diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h
    index 04c99f3..ee688b0a 100644
    --- a/arch/arm/include/asm/ptrace.h
    +++ b/arch/arm/include/asm/ptrace.h
    @@ -80,6 +80,12 @@ static inline long regs_return_value(struct pt_regs *regs)

    #define instruction_pointer(regs) (regs)->ARM_pc

    +static inline void instruction_pointer_set(struct pt_regs *regs,
    + unsigned long val)
    +{
    + instruction_pointer(regs) = val;
    +}
    +
    #ifdef CONFIG_SMP
    extern unsigned long profile_pc(struct pt_regs *regs);
    #else
    diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
    index 71a06b2..f989d7c 100644
    --- a/arch/arm/include/asm/thread_info.h
    +++ b/arch/arm/include/asm/thread_info.h
    @@ -153,6 +153,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
    #define TIF_SIGPENDING 0
    #define TIF_NEED_RESCHED 1
    #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
    +#define TIF_UPROBE 7
    #define TIF_SYSCALL_TRACE 8
    #define TIF_SYSCALL_AUDIT 9
    #define TIF_SYSCALL_TRACEPOINT 10
    @@ -165,6 +166,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
    #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
    #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
    #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
    +#define _TIF_UPROBE (1 << TIF_UPROBE)
    #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
    #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
    #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
    @@ -178,7 +180,8 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
    /*
    * Change these and you break ASM code in entry-common.S
    */
    -#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_RESUME)
    +#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
    + _TIF_NOTIFY_RESUME | _TIF_UPROBE)

    #endif /* __KERNEL__ */
    #endif /* __ASM_ARM_THREAD_INFO_H */
    diff --git a/arch/arm/include/asm/uprobes.h b/arch/arm/include/asm/uprobes.h
    new file mode 100644
    index 0000000..9472c20
    --- /dev/null
    +++ b/arch/arm/include/asm/uprobes.h
    @@ -0,0 +1,45 @@
    +/*
    + * Copyright (C) 2012 Rabin Vincent <rabin at rab.in>
    + *
    + * 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.
    + */
    +
    +#ifndef _ASM_UPROBES_H
    +#define _ASM_UPROBES_H
    +
    +#include <asm/probes.h>
    +#include <asm/opcodes.h>
    +
    +typedef u32 uprobe_opcode_t;
    +
    +#define MAX_UINSN_BYTES 4
    +#define UPROBE_XOL_SLOT_BYTES 64
    +
    +#define UPROBE_SWBP_ARM_INSN 0xe7f001f9
    +#define UPROBE_SS_ARM_INSN 0xe7f001fa
    +#define UPROBE_SWBP_INSN __opcode_to_mem_arm(UPROBE_SWBP_ARM_INSN)
    +#define UPROBE_SWBP_INSN_SIZE 4
    +
    +struct arch_uprobe_task {
    + u32 backup;
    + unsigned long saved_trap_no;
    +};
    +
    +struct arch_uprobe {
    + u8 insn[MAX_UINSN_BYTES];
    + unsigned long ixol[2];
    + uprobe_opcode_t bpinsn;
    + bool simulate;
    + u32 pcreg;
    + void (*prehandler)(struct arch_uprobe *auprobe,
    + struct arch_uprobe_task *autask,
    + struct pt_regs *regs);
    + void (*posthandler)(struct arch_uprobe *auprobe,
    + struct arch_uprobe_task *autask,
    + struct pt_regs *regs);
    + struct arch_probes_insn asi;
    +};
    +
    +#endif
    diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
    index bb739f2..a766bcb 100644
    --- a/arch/arm/kernel/Makefile
    +++ b/arch/arm/kernel/Makefile
    @@ -50,6 +50,7 @@ obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o insn.o
    obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o insn.o
    obj-$(CONFIG_JUMP_LABEL) += jump_label.o insn.o patch.o
    obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
    +obj-$(CONFIG_UPROBES) += probes.o probes-arm.o uprobes.o uprobes-arm.o
    obj-$(CONFIG_KPROBES) += probes.o kprobes.o kprobes-common.o patch.o
    ifdef CONFIG_THUMB2_KERNEL
    obj-$(CONFIG_KPROBES) += kprobes-thumb.o probes-thumb.o
    diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
    index 04d6388..bd19834 100644
    --- a/arch/arm/kernel/signal.c
    +++ b/arch/arm/kernel/signal.c
    @@ -13,6 +13,7 @@
    #include <linux/personality.h>
    #include <linux/uaccess.h>
    #include <linux/tracehook.h>
    +#include <linux/uprobes.h>

    #include <asm/elf.h>
    #include <asm/cacheflush.h>
    @@ -590,6 +591,9 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
    return restart;
    }
    syscall = 0;
    + } else if (thread_flags & _TIF_UPROBE) {
    + clear_thread_flag(TIF_UPROBE);
    + uprobe_notify_resume(regs);
    } else {
    clear_thread_flag(TIF_NOTIFY_RESUME);
    tracehook_notify_resume(regs);
    diff --git a/arch/arm/kernel/uprobes-arm.c b/arch/arm/kernel/uprobes-arm.c
    new file mode 100644
    index 0000000..d5feb50
    --- /dev/null
    +++ b/arch/arm/kernel/uprobes-arm.c
    @@ -0,0 +1,231 @@
    +/*
    + * Copyright (C) 2012 Rabin Vincent <rabin at rab.in>
    + *
    + * 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.
    + */
    +
    +#include <linux/kernel.h>
    +#include <linux/wait.h>
    +#include <linux/uprobes.h>
    +#include <linux/module.h>
    +
    +#include "probes.h"
    +#include "probes-arm.h"
    +#include "uprobes.h"
    +
    +static int uprobes_substitute_pc(unsigned long *pinsn, u32 oregs)
    +{
    + probes_opcode_t insn = __mem_to_opcode_arm(*pinsn);
    + probes_opcode_t temp;
    + probes_opcode_t mask;
    + int freereg;
    + u32 free = 0xffff;
    + u32 regs;
    +
    + for (regs = oregs; regs; regs >>= 4, insn >>= 4) {
    + if ((regs & 0xf) == REG_TYPE_NONE)
    + continue;
    +
    + free &= ~(1 << (insn & 0xf));
    + }
    +
    + /* No PC, no problem */
    + if (free & (1 << 15))
    + return 15;
    +
    + if (!free)
    + return -1;
    +
    + /*
    + * fls instead of ffs ensures that for "ldrd r0, r1, [pc]" we would
    + * pick LR instead of R1.
    + */
    + freereg = free = fls(free) - 1;
    +
    + temp = __mem_to_opcode_arm(*pinsn);
    + insn = temp;
    + regs = oregs;
    + mask = 0xf;
    +
    + for (; regs; regs >>= 4, mask <<= 4, free <<= 4, temp >>= 4) {
    + if ((regs & 0xf) == REG_TYPE_NONE)
    + continue;
    +
    + if ((temp & 0xf) != 15)
    + continue;
    +
    + insn &= ~mask;
    + insn |= free & mask;
    + }
    +
    + *pinsn = __opcode_to_mem_arm(insn);
    + return freereg;
    +}
    +
    +static void uprobe_set_pc(struct arch_uprobe *auprobe,
    + struct arch_uprobe_task *autask,
    + struct pt_regs *regs)
    +{
    + u32 pcreg = auprobe->pcreg;
    +
    + autask->backup = regs->uregs[pcreg];
    + regs->uregs[pcreg] = regs->ARM_pc + 8;
    +}
    +
    +static void uprobe_unset_pc(struct arch_uprobe *auprobe,
    + struct arch_uprobe_task *autask,
    + struct pt_regs *regs)
    +{
    + /* PC will be taken care of by common code */
    + regs->uregs[auprobe->pcreg] = autask->backup;
    +}
    +
    +static void uprobe_aluwrite_pc(struct arch_uprobe *auprobe,
    + struct arch_uprobe_task *autask,
    + struct pt_regs *regs)
    +{
    + u32 pcreg = auprobe->pcreg;
    +
    + alu_write_pc(regs->uregs[pcreg], regs);
    + regs->uregs[pcreg] = autask->backup;
    +}
    +
    +static void uprobe_write_pc(struct arch_uprobe *auprobe,
    + struct arch_uprobe_task *autask,
    + struct pt_regs *regs)
    +{
    + u32 pcreg = auprobe->pcreg;
    +
    + load_write_pc(regs->uregs[pcreg], regs);
    + regs->uregs[pcreg] = autask->backup;
    +}
    +
    +enum probes_insn
    +decode_pc_ro(probes_opcode_t insn, struct arch_probes_insn *asi,
    + struct decode_header *d)
    +{
    + struct arch_uprobe *auprobe = container_of(asi, struct arch_uprobe,
    + asi);
    + struct decode_emulate *decode = (struct decode_emulate *) d;
    + u32 regs = decode->header.type_regs.bits >> DECODE_TYPE_BITS;
    + int reg;
    +
    + reg = uprobes_substitute_pc(&auprobe->ixol[0], regs);
    + if (reg == 15)
    + return INSN_GOOD;
    +
    + if (reg == -1)
    + return INSN_REJECTED;
    +
    + auprobe->pcreg = reg;
    + auprobe->prehandler = uprobe_set_pc;
    + auprobe->posthandler = uprobe_unset_pc;
    +
    + return INSN_GOOD;
    +}
    +
    +enum probes_insn
    +decode_wb_pc(probes_opcode_t insn, struct arch_probes_insn *asi,
    + struct decode_header *d, bool alu)
    +{
    + struct arch_uprobe *auprobe = container_of(asi, struct arch_uprobe,
    + asi);
    + enum probes_insn ret = decode_pc_ro(insn, asi, d);
    +
    + if (((insn >> 12) & 0xf) == 15)
    + auprobe->posthandler = alu ? uprobe_aluwrite_pc
    + : uprobe_write_pc;
    +
    + return ret;
    +}
    +
    +enum probes_insn
    +decode_rd12rn16rm0rs8_rwflags(probes_opcode_t insn,
    + struct arch_probes_insn *asi,
    + struct decode_header *d)
    +{
    + return decode_wb_pc(insn, asi, d, true);
    +}
    +
    +enum probes_insn
    +decode_ldr(probes_opcode_t insn, struct arch_probes_insn *asi,
    + struct decode_header *d)
    +{
    + return decode_wb_pc(insn, asi, d, false);
    +}
    +
    +enum probes_insn
    +uprobe_decode_ldmstm(probes_opcode_t insn,
    + struct arch_probes_insn *asi, struct decode_header *d)
    +{
    + struct arch_uprobe *auprobe = container_of(asi, struct arch_uprobe,
    + asi);
    + unsigned reglist = insn & 0xffff;
    + int rn = (insn >> 16) & 0xf;
    + int lbit = insn & (1 << 20);
    + unsigned used = reglist | (1 << rn);
    +
    + if (rn == 15)
    + return INSN_REJECTED;
    +
    + if (!(used & (1 << 15)))
    + return INSN_GOOD;
    +
    + if (used & (1 << 14))
    + return INSN_REJECTED;
    +
    + /* Use LR instead of PC */
    + insn ^= 0xc000;
    +
    + auprobe->pcreg = 14;
    + auprobe->ixol[0] = __opcode_to_mem_arm(insn);
    +
    + auprobe->prehandler = uprobe_set_pc;
    + if (lbit)
    + auprobe->posthandler = uprobe_write_pc;
    + else
    + auprobe->posthandler = uprobe_unset_pc;
    +
    + return INSN_GOOD;
    +}
    +
    +const union decode_action uprobes_probes_actions[] = {
    + [PROBES_EMULATE_NONE] = {.handler = probes_simulate_nop},
    + [PROBES_SIMULATE_NOP] = {.handler = probes_simulate_nop},
    + [PROBES_PRELOAD_IMM] = {.handler = probes_simulate_nop},
    + [PROBES_PRELOAD_REG] = {.handler = probes_simulate_nop},
    + [PROBES_BRANCH_IMM] = {.handler = simulate_blx1},
    + [PROBES_MRS] = {.handler = simulate_mrs},
    + [PROBES_BRANCH_REG] = {.handler = simulate_blx2bx},
    + [PROBES_CLZ] = {.handler = probes_simulate_nop},
    + [PROBES_SATURATING_ARITHMETIC] = {.handler = probes_simulate_nop},
    + [PROBES_MUL1] = {.handler = probes_simulate_nop},
    + [PROBES_MUL2] = {.handler = probes_simulate_nop},
    + [PROBES_SWP] = {.handler = probes_simulate_nop},
    + [PROBES_LDRSTRD] = {.decoder = decode_pc_ro},
    + [PROBES_LOAD_EXTRA] = {.decoder = decode_pc_ro},
    + [PROBES_LOAD] = {.decoder = decode_ldr},
    + [PROBES_STORE_EXTRA] = {.decoder = decode_pc_ro},
    + [PROBES_STORE] = {.decoder = decode_pc_ro},
    + [PROBES_MOV_IP_SP] = {.handler = simulate_mov_ipsp},
    + [PROBES_DATA_PROCESSING_REG] = {
    + .decoder = decode_rd12rn16rm0rs8_rwflags},
    + [PROBES_DATA_PROCESSING_IMM] = {
    + .decoder = decode_rd12rn16rm0rs8_rwflags},
    + [PROBES_MOV_HALFWORD] = {.handler = probes_simulate_nop},
    + [PROBES_SEV] = {.handler = probes_simulate_nop},
    + [PROBES_WFE] = {.handler = probes_simulate_nop},
    + [PROBES_SATURATE] = {.handler = probes_simulate_nop},
    + [PROBES_REV] = {.handler = probes_simulate_nop},
    + [PROBES_MMI] = {.handler = probes_simulate_nop},
    + [PROBES_PACK] = {.handler = probes_simulate_nop},
    + [PROBES_EXTEND] = {.handler = probes_simulate_nop},
    + [PROBES_EXTEND_ADD] = {.handler = probes_simulate_nop},
    + [PROBES_MUL_ADD_LONG] = {.handler = probes_simulate_nop},
    + [PROBES_MUL_ADD] = {.handler = probes_simulate_nop},
    + [PROBES_BITFIELD] = {.handler = probes_simulate_nop},
    + [PROBES_BRANCH] = {.handler = simulate_bbl},
    + [PROBES_LDMSTM] = {.decoder = uprobe_decode_ldmstm}
    +};
    diff --git a/arch/arm/kernel/uprobes.c b/arch/arm/kernel/uprobes.c
    new file mode 100644
    index 0000000..bfe08ba2
    --- /dev/null
    +++ b/arch/arm/kernel/uprobes.c
    @@ -0,0 +1,208 @@
    +/*
    + * Copyright (C) 2012 Rabin Vincent <rabin at rab.in>
    + *
    + * 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.
    + */
    +
    +#include <linux/kernel.h>
    +#include <linux/highmem.h>
    +#include <linux/sched.h>
    +#include <linux/uprobes.h>
    +#include <linux/notifier.h>
    +
    +#include <asm/opcodes.h>
    +#include <asm/traps.h>
    +
    +#include "probes.h"
    +#include "probes-arm.h"
    +#include "uprobes.h"
    +
    +#define UPROBE_TRAP_NR UINT_MAX
    +
    +bool is_swbp_insn(uprobe_opcode_t *insn)
    +{
    + return (__mem_to_opcode_arm(*insn) & 0x0fffffff) ==
    + (UPROBE_SWBP_ARM_INSN & 0x0fffffff);
    +}
    +
    +int set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm,
    + unsigned long vaddr)
    +{
    + return uprobe_write_opcode(mm, vaddr,
    + __opcode_to_mem_arm(auprobe->bpinsn));
    +}
    +
    +bool arch_uprobe_ignore(struct arch_uprobe *auprobe, struct pt_regs *regs)
    +{
    + if (!auprobe->asi.insn_check_cc(regs->ARM_cpsr)) {
    + regs->ARM_pc += 4;
    + return true;
    + }
    +
    + return false;
    +}
    +
    +bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs)
    +{
    + probes_opcode_t opcode;
    +
    + if (!auprobe->simulate)
    + return false;
    +
    + opcode = __mem_to_opcode_arm(*(unsigned int *) auprobe->insn);
    +
    + auprobe->asi.insn_singlestep(opcode, &auprobe->asi, regs);
    +
    + return true;
    +}
    +
    +unsigned long
    +arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr,
    + struct pt_regs *regs)
    +{
    + unsigned long orig_ret_vaddr;
    +
    + orig_ret_vaddr = regs->ARM_lr;
    + /* Replace the return addr with trampoline addr */
    + regs->ARM_lr = trampoline_vaddr;
    + return orig_ret_vaddr;
    +}
    +
    +int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm,
    + unsigned long addr)
    +{
    + unsigned int insn;
    + unsigned int bpinsn;
    + enum probes_insn ret;
    +
    + /* Thumb not yet support */
    + if (addr & 0x3)
    + return -EINVAL;
    +
    + insn = __mem_to_opcode_arm(*(unsigned int *)auprobe->insn);
    + auprobe->ixol[0] = __opcode_to_mem_arm(insn);
    + auprobe->ixol[1] = __opcode_to_mem_arm(UPROBE_SS_ARM_INSN);
    +
    + ret = arm_probes_decode_insn(insn, &auprobe->asi, false,
    + uprobes_probes_actions);
    + switch (ret) {
    + case INSN_REJECTED:
    + return -EINVAL;
    +
    + case INSN_GOOD_NO_SLOT:
    + auprobe->simulate = true;
    + break;
    +
    + case INSN_GOOD:
    + default:
    + break;
    + }
    +
    + bpinsn = UPROBE_SWBP_ARM_INSN & 0x0fffffff;
    + if (insn >= 0xe0000000)
    + bpinsn |= 0xe0000000; /* Unconditional instruction */
    + else
    + bpinsn |= insn & 0xf0000000; /* Copy condition from insn */
    +
    + auprobe->bpinsn = bpinsn;
    +
    + return 0;
    +}
    +
    +int arch_uprobe_pre_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
    +{
    + struct uprobe_task *utask = current->utask;
    +
    + if (auprobe->prehandler)
    + auprobe->prehandler(auprobe, &utask->autask, regs);
    +
    + utask->autask.saved_trap_no = current->thread.trap_no;
    + current->thread.trap_no = UPROBE_TRAP_NR;
    + regs->ARM_pc = utask->xol_vaddr;
    +
    + return 0;
    +}
    +
    +int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
    +{
    + struct uprobe_task *utask = current->utask;
    +
    + WARN_ON_ONCE(current->thread.trap_no != UPROBE_TRAP_NR);
    +
    + current->thread.trap_no = utask->autask.saved_trap_no;
    + regs->ARM_pc = utask->vaddr + 4;
    +
    + if (auprobe->posthandler)
    + auprobe->posthandler(auprobe, &utask->autask, regs);
    +
    + return 0;
    +}
    +
    +bool arch_uprobe_xol_was_trapped(struct task_struct *t)
    +{
    + if (t->thread.trap_no != UPROBE_TRAP_NR)
    + return true;
    +
    + return false;
    +}
    +
    +void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
    +{
    + struct uprobe_task *utask = current->utask;
    +
    + current->thread.trap_no = utask->autask.saved_trap_no;
    + instruction_pointer_set(regs, utask->vaddr);
    +}
    +
    +int arch_uprobe_exception_notify(struct notifier_block *self,
    + unsigned long val, void *data)
    +{
    + return NOTIFY_DONE;
    +}
    +
    +static int uprobe_trap_handler(struct pt_regs *regs, unsigned int instr)
    +{
    + unsigned long flags;
    +
    + local_irq_save(flags);
    + instr &= 0x0fffffff;
    + if (instr == (UPROBE_SWBP_ARM_INSN & 0x0fffffff))
    + uprobe_pre_sstep_notifier(regs);
    + else if (instr == (UPROBE_SS_ARM_INSN & 0x0fffffff))
    + uprobe_post_sstep_notifier(regs);
    + local_irq_restore(flags);
    +
    + return 0;
    +}
    +
    +unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
    +{
    + return instruction_pointer(regs);
    +}
    +
    +static struct undef_hook uprobes_arm_break_hook = {
    + .instr_mask = 0x0fffffff,
    + .instr_val = (UPROBE_SWBP_ARM_INSN & 0x0fffffff),
    + .cpsr_mask = MODE_MASK,
    + .cpsr_val = USR_MODE,
    + .fn = uprobe_trap_handler,
    +};
    +
    +static struct undef_hook uprobes_arm_ss_hook = {
    + .instr_mask = 0x0fffffff,
    + .instr_val = (UPROBE_SS_ARM_INSN & 0x0fffffff),
    + .cpsr_mask = MODE_MASK,
    + .cpsr_val = USR_MODE,
    + .fn = uprobe_trap_handler,
    +};
    +
    +static int arch_uprobes_init(void)
    +{
    + register_undef_hook(&uprobes_arm_break_hook);
    + register_undef_hook(&uprobes_arm_ss_hook);
    +
    + return 0;
    +}
    +device_initcall(arch_uprobes_init);
    diff --git a/arch/arm/kernel/uprobes.h b/arch/arm/kernel/uprobes.h
    new file mode 100644
    index 0000000..a6581f5
    --- /dev/null
    +++ b/arch/arm/kernel/uprobes.h
    @@ -0,0 +1,35 @@
    +/*
    + * Copyright (C) 2012 Rabin Vincent <rabin at rab.in>
    + *
    + * 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.
    + */
    +
    +#ifndef __ARM_KERNEL_UPROBES_H
    +#define __ARM_KERNEL_UPROBES_H
    +
    +enum probes_insn uprobe_decode_ldmstm(probes_opcode_t insn,
    + struct arch_probes_insn *asi,
    + struct decode_header *d);
    +
    +enum probes_insn decode_ldr(probes_opcode_t insn,
    + struct arch_probes_insn *asi,
    + struct decode_header *d);
    +
    +enum probes_insn
    +decode_rd12rn16rm0rs8_rwflags(probes_opcode_t insn,
    + struct arch_probes_insn *asi,
    + struct decode_header *d);
    +
    +enum probes_insn
    +decode_wb_pc(probes_opcode_t insn, struct arch_probes_insn *asi,
    + struct decode_header *d, bool alu);
    +
    +enum probes_insn
    +decode_pc_ro(probes_opcode_t insn, struct arch_probes_insn *asi,
    + struct decode_header *d);
    +
    +extern const union decode_action uprobes_probes_actions[];
    +
    +#endif
    --
    1.8.1.2


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