Major update to memory map change notification code.

2008-06-23  David Smith  <dsmith@redhat.com>

	* tapsets.cxx (utrace_derived_probe_group::emit_probe_decl):
	Handles UDPF_NONE value.
	(utrace_derived_probe_group::emit_vm_callback_probe_decl): New
	function.
	(utrace_derived_probe_group::emit_module_decls): Calls
	emit_vm_callback_probe_decl() to set up vm_callbacks.

2008-06-23  David Smith  <dsmith@redhat.com>

	* task_finder.c (__stp_tf_vm_cb): New function.
	(stap_register_task_finder_target): Sets up syscall entry and
	syscall exit handlers.
	(__stp_find_file_based_vma): New function.
	(__stp_utrace_task_finder_target_syscall_entry): New function.
	Saves vma information off at syscall entry.
	(__stp_target_call_vm_callback): New function.
	(__stp_utrace_task_finder_target_syscall_exit): New function.
	Handles changes to memory maps based on information saved at
	syscall entry.
	* syscall.h: New file containing syscall function.
	* task_finder_vma.c: New file containing saved vma information
	handling functions.

1 files changed, 132 insertions, 0 deletions

diff --git a/runtime/syscall.h b/runtime/syscall.h
new file mode 100644
index 00000000..3e37b550
--- /dev/null
+++ b/runtime/syscall.h
@@ -0,0 +1,132 @@
+/* syscall defines and inlines
+ * Copyright (C) 2008 Red Hat Inc.
+ *
+ * This file is part of systemtap, and is free software.  You can
+ * redistribute it and/or modify it under the terms of the GNU General
+ * Public License (GPL); either version 2, or (at your option) any
+ * later version.
+ */
+
+#ifndef _SYSCALL_H_ /* -*- linux-c -*- */
+#define _SYSCALL_H_
+
+#if defined(__i386__) || defined(CONFIG_IA32_EMULATION)
+#define __MMAP_SYSCALL_NO_IA32		192 /* mmap2 */
+#define __MPROTECT_SYSCALL_NO_IA32	125
+#define __MUNMAP_SYSCALL_NO_IA32	91
+#define __MREMAP_SYSCALL_NO_IA32	163
+# if !defined(CONFIG_IA32_EMULATION)
+#define MMAP_SYSCALL_NO(tsk) __MMAP_SYSCALL_NO_IA32
+#define MPROTECT_SYSCALL_NO(tsk) __MPROTECT_SYSCALL_NO_IA32
+#define MUNMAP_SYSCALL_NO(tsk) __MUNMAP_SYSCALL_NO_IA32
+#define MREMAP_SYSCALL_NO(tsk) __MREMAP_SYSCALL_NO_IA32
+# endif
+#endif
+
+#if defined(__x86_64__)
+#define __MMAP_SYSCALL_NO_X86_64	9
+#define __MPROTECT_SYSCALL_NO_X86_64	10
+#define __MUNMAP_SYSCALL_NO_X86_64	11
+#define __MREMAP_SYSCALL_NO_X86_64	25
+# if defined(CONFIG_IA32_EMULATION)
+#define MMAP_SYSCALL_NO(tsk) ((test_tsk_thread_flag((tsk), TIF_IA32)) \
+			      ? __MMAP_SYSCALL_NO_IA32 \
+			      : __MMAP_SYSCALL_NO_X86_64)
+#define MPROTECT_SYSCALL_NO(tsk) ((test_tsk_thread_flag((tsk), TIF_IA32)) \
+				  ? __MPROTECT_SYSCALL_NO_IA32		\
+				  : __MPROTECT_SYSCALL_NO_X86_64)
+#define MUNMAP_SYSCALL_NO(tsk) ((test_tsk_thread_flag((tsk), TIF_IA32)) \
+				  ? __MUNMAP_SYSCALL_NO_IA32		\
+				  : __MUNMAP_SYSCALL_NO_X86_64)
+#define MREMAP_SYSCALL_NO(tsk) ((test_tsk_thread_flag((tsk), TIF_IA32)) \
+				  ? __MREMAP_SYSCALL_NO_IA32		\
+				  : __MREMAP_SYSCALL_NO_X86_64)
+# else
+#define MMAP_SYSCALL_NO(tsk) __MMAP_SYSCALL_NO_X86_64
+#define MPROTECT_SYSCALL_NO(tsk) __MPROTECT_SYSCALL_NO_X86_64
+#define MUNMAP_SYSCALL_NO(tsk) __MUNMAP_SYSCALL_NO_X86_64
+#define MREMAP_SYSCALL_NO(tsk) __MREMAP_SYSCALL_NO_X86_64
+# endif
+#endif
+
+#if !defined(MMAP_SYSCALL_NO) || !defined(MPROTECT_SYSCALL_NO) \
+	|| !defined(MUNMAP_SYSCALL_NO) || !defined(MREMAP_SYSCALL_NO)
+#error "Unimplemented architecture"
+#endif
+
+#if defined(__i386__) || defined(__x86_64__)
+static inline unsigned long
+__stp_user_syscall_nr(struct pt_regs *regs)
+{
+#if defined(STAPCONF_X86_UNIREGS)
+    return regs->orig_ax;
+#elif defined(__x86_64__)
+    return regs->orig_rax;
+#elif defined (__i386__)
+    return regs->orig_eax;
+#endif
+}
+#endif
+
+#if defined(__i386__) || defined(__x86_64__)
+static inline long *
+__stp_user_syscall_return_value(struct task_struct *task, struct pt_regs *regs)
+{
+#ifdef CONFIG_IA32_EMULATION
+// This code works, but isn't what we need.  Since
+// __stp_user_syscall_arg() doesn't sign-extend, a value passed in as
+// an argument and then returned won't compare correctly anymore.  So,
+// for now, disable this code.
+# if 0
+	if (test_tsk_thread_flag(task, TIF_IA32))
+		// Sign-extend the value so (int)-EFOO becomes (long)-EFOO
+		// and will match correctly in comparisons.
+		regs->ax = (long) (int) regs->ax;
+# endif
+#endif
+	return &regs->ax;
+}
+#endif
+
+#if defined(__i386__) || defined(__x86_64__)
+static inline long *
+__stp_user_syscall_arg(struct task_struct *task, struct pt_regs *regs,
+		       unsigned int n)
+{
+#if defined(CONFIG_X86_32)
+	if (n > 5) {
+		_stp_error("syscall arg > 5");
+		return NULL;
+	}
+	return &regs->bx + n;
+#elif defined(CONFIG_X86_64)
+#ifdef CONFIG_IA32_EMULATION
+	if (test_tsk_thread_flag(task, TIF_IA32))
+		switch (n) {
+		case 0: return &regs->bx;
+		case 1: return &regs->cx;
+		case 2: return &regs->dx;
+		case 3: return &regs->si;
+		case 4: return &regs->di;
+		case 5: return &regs->bp;
+		default: 
+			_stp_error("syscall arg > 5");
+			return NULL;
+		}
+#endif /* CONFIG_IA32_EMULATION */
+	switch (n) {
+	case 0: return &regs->di;
+	case 1: return &regs->si;
+	case 2: return &regs->dx;
+	case 3: return &regs->r10;
+	case 4: return &regs->r8;
+	case 5: return &regs->r9;
+	default: 
+		_stp_error("syscall arg > 5");
+		return NULL;
+	}
+#endif /* CONFIG_X86_32 */
+}
+#endif
+
+#endif /* _SYSCALL_H_ */