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-rw-r--r--arch/arm/kernel/uprobes.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/arch/arm/kernel/uprobes.c b/arch/arm/kernel/uprobes.c
new file mode 100644
index 00000000000..f9bacee973b
--- /dev/null
+++ b/arch/arm/kernel/uprobes.c
@@ -0,0 +1,210 @@
+/*
+ * 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/stddef.h>
+#include <linux/errno.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);