Add a version of uprobes that works with the 2.6.27 version of utrace.

1 files changed, 107 insertions, 0 deletions

diff --git a/runtime/uprobes2/uprobes_x86.h b/runtime/uprobes2/uprobes_x86.h
new file mode 100644
index 00000000..ca3f4873
--- /dev/null
+++ b/runtime/uprobes2/uprobes_x86.h
@@ -0,0 +1,107 @@
+#ifndef _ASM_UPROBES_H
+#define _ASM_UPROBES_H
+/*
+ *  Userspace Probes (UProbes)
+ *  uprobes.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) IBM Corporation, 2008
+ */
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/sched.h>
+#include <asm/thread_info.h>
+
+/* Normally defined in Kconfig */
+#define CONFIG_URETPROBES 1
+#define CONFIG_UPROBES_SSOL 1
+
+typedef u8 uprobe_opcode_t;
+#define BREAKPOINT_INSTRUCTION	0xcc
+#define BP_INSN_SIZE 1
+#define MAX_UINSN_BYTES 16
+
+// SLOT_IP should be 16 for 64-bit apps (include/asm-x86_64/elf.h)
+// but 12 for 32-bit apps (arch/x86_64/ia32/ia32_binfmt.c)
+#ifdef CONFIG_X86_32
+#define SLOT_IP(tsk) 12
+#else
+#define SLOT_IP(tsk) (test_tsk_thread_flag(tsk, TIF_IA32) ? 12 : 16)
+#endif
+
+#define BREAKPOINT_SIGNAL SIGTRAP
+#define SSTEP_SIGNAL SIGTRAP
+
+/* Architecture specific switch for where the IP points after a bp hit */
+#define ARCH_BP_INST_PTR(inst_ptr)	(inst_ptr - BP_INSN_SIZE)
+
+#define UPFIX_RIP_RAX 0x1	/* (%rip) insn rewritten to use (%rax) */
+#define UPFIX_RIP_RCX 0x2	/* (%rip) insn rewritten to use (%rcx) */
+
+#ifdef CONFIG_X86_64
+struct uprobe_probept_arch_info {
+	unsigned long flags;
+	unsigned long rip_target_address;
+};
+
+struct uprobe_task_arch_info {
+	unsigned long saved_scratch_register;
+};
+#else
+struct uprobe_probept_arch_info {};
+struct uprobe_task_arch_info {};
+#endif
+
+struct uprobe_probept;
+struct uprobe_task;
+
+static int arch_validate_probed_insn(struct uprobe_probept *ppt,
+						struct task_struct *tsk);
+
+/* On x86, the int3 traps leaves ip pointing past the int3 instruction. */
+static inline unsigned long arch_get_probept(struct pt_regs *regs)
+{
+	return (unsigned long) (regs->ip - BP_INSN_SIZE);
+}
+
+static inline void arch_reset_ip_for_sstep(struct pt_regs *regs)
+{
+	regs->ip -= BP_INSN_SIZE;
+}
+
+static inline void arch_restore_uret_addr(unsigned long ret_addr,
+	struct pt_regs *regs)
+{
+	regs->ip = ret_addr;
+}
+
+static inline unsigned long arch_get_cur_sp(struct pt_regs *regs)
+{
+	return (unsigned long) regs->sp;
+}
+
+static inline unsigned long arch_predict_sp_at_ret(struct pt_regs *regs,
+		struct task_struct *tsk)
+{
+	if (test_tsk_thread_flag(tsk, TIF_IA32))
+		return (unsigned long) (regs->sp + 4);
+	else
+		return (unsigned long) (regs->sp + 8);
+}
+
+static unsigned long arch_hijack_uret_addr(unsigned long trampoline_addr,
+				struct pt_regs*, struct uprobe_task*);
+#endif				/* _ASM_UPROBES_H */