SKAS4 - Host get_mm and switch_mm

index cd2327d..38ec9fd 100644
@@ -1,5 +1,5 @@
 /* 
- * Copyright (C) 2000, 2001, 2002 Jeff Dike ([email protected])
+ * Copyright (C) 2000 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * Licensed under the GPL
  */
 

@@ -7,19 +7,10 @@
 #define __SKAS_PTRACE_H
 
 #define PTRACE_FAULTINFO 52
-#define PTRACE_SWITCH_MM 55
+#ifndef OLD_PTRACE_SWITCH_MM
+#define OLD_PTRACE_SWITCH_MM 55
+#endif
 
 #include "sysdep/skas_ptrace.h"
 
 #endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */

index 7565072..9a4892d 100644
@@ -43,6 +43,8 @@
 
 #define FP_SIZE ((HOST_XFP_SIZE > HOST_FP_SIZE) ? HOST_XFP_SIZE : HOST_FP_SIZE)
 
+#define FP_SIZE ((HOST_XFP_SIZE > HOST_FP_SIZE) ? HOST_XFP_SIZE : HOST_FP_SIZE)
+
 #ifndef FRAME_SIZE
 #define FRAME_SIZE (17)
 #endif

index 45c0bd8..4e10c60 100644
@@ -72,6 +72,8 @@
 
 #define FP_SIZE (HOST_FP_SIZE)
 
+#define FP_SIZE (HOST_FP_SIZE)
+
 #endif
 
 /*

index 47b57b4..6b6855a 100644
@@ -192,7 +192,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 	}
 #endif
 #ifdef CONFIG_PROC_MM
-	case PTRACE_SWITCH_MM: {
+	case OLD_PTRACE_SWITCH_MM: {
 		struct mm_struct *old = child->mm;
 		struct mm_struct *new = proc_mm_get_mm(data);
 

@@ -292,3 +292,36 @@ void syscall_trace(struct uml_pt_regs *regs, int entryexit)
 		current->exit_code = 0;
 	}
 }
+
+int ptrace_to_pt_regs(struct pt_regs *to, struct user_regs __user *from)
+{
+	struct user_regs regs;
+	int rem;
+
+	rem = copy_from_user(&regs, from, sizeof(regs));
+	if (rem)
+		return -EFAULT;
+
+	memcpy(&to->regs.gp, &regs.regs, sizeof(to->regs.gp));
+
+	return put_fp_registers(userspace_pid[0],
+				(unsigned long *) &regs.fpregs);
+}
+
+int pt_regs_to_ptrace(struct user_regs __user *to, struct pt_regs *from)
+{
+	struct user_regs regs;
+	int err;
+
+	err = get_fp_registers(userspace_pid[0],
+			       (unsigned long *) &regs.fpregs);
+	if (err)
+		return err;
+
+	memcpy(&regs.regs, &from->regs.gp, sizeof(regs.regs));
+
+	if(copy_to_user(to, &regs, sizeof(regs)))
+		return -EFAULT;
+
+	return 0;
+}

index 9cffc62..a9c2f6f 100644
@@ -148,3 +148,13 @@ int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 
 	return ret;
 }
+
+extern long do_switch_mm(int fd, long __user *save, long __user *new,
+			 unsigned long ip, unsigned long sp,
+			 struct pt_regs *regs);
+
+long sys_switch_mm(int fd, long __user *save, long __user *new,
+		   unsigned long ip, unsigned long sp)
+{
+	return do_switch_mm(fd, save, new, ip, sp, &current->thread.regs);
+}

index 1e8cba6..cbb7986 100644
@@ -716,7 +716,7 @@ void __switch_mm(struct mm_id *mm_idp)
 
 	/* FIXME: need cpu pid in __switch_mm */
 	if (proc_mm) {
-		err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0,
+		err = ptrace(OLD_PTRACE_SWITCH_MM, userspace_pid[0], 0,
 			     mm_idp->u.mm_fd);
 		if (err) {
 			printk(UM_KERN_ERR "__switch_mm - PTRACE_SWITCH_MM "

index c128eb8..8b5c216 100644
@@ -39,6 +39,7 @@
 #define stub_rt_sigsuspend sys_rt_sigsuspend
 #define stub_sigaltstack sys_sigaltstack
 #define stub_rt_sigreturn sys_rt_sigreturn
+#define stub_switch_mm sys_switch_mm
 
 #define __SYSCALL(nr, sym) extern asmlinkage void sym(void) ;
 #undef _ASM_X86_64_UNISTD_H_

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index a86d26f..23f6aff 100644
@@ -21,6 +21,7 @@
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
+#include <asm/user.h>
 
 /*
  * sys_pipe() is the normal C calling standard for creating

@@ -261,3 +262,14 @@ int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 	: "0" (__NR_execve),"ri" (filename),"c" (argv), "d" (envp) : "memory");
 	return __res;
 }
+
+extern long do_switch_mm(int fd, struct __user user_regs *save,
+			 struct __user user_regs *new, unsigned long ip,
+			 unsigned long sp, struct pt_regs *regs);
+
+asmlinkage long sys_switch_mm(struct pt_regs regs)
+{
+	return do_switch_mm(regs.bx, (struct __user user_regs *) regs.cx,
+			    (struct __user user_regs *) regs.dx, regs.si,
+			    regs.di, &regs);
+}

index bd802a5..b3c98f5 100644
@@ -251,3 +251,14 @@ asmlinkage long sys_uname(struct new_utsname __user * name)
 		err |= copy_to_user(&name->machine, "i686", 5); 		
 	return err ? -EFAULT : 0;
 }
+
+extern long do_switch_mm(int fd, struct __user user_regs *save,
+			 struct __user user_regs *new, unsigned long ip,
+			 unsigned long sp, struct pt_regs *regs);
+
+asmlinkage long sys_switch_mm(int fd, struct __user user_regs *save,
+			      struct __user user_regs *new, unsigned long ip,
+			      unsigned long sp, struct pt_regs *regs)
+{
+	return do_switch_mm(fd, save, new, ip, sp, regs);
+}

index 81d7d14..082f349 100644
@@ -2279,6 +2279,37 @@ static int proc_pid_io_accounting(struct task_struct *task, char *buffer)
 }
 #endif
 
+static int proc_pid_mm_open(struct inode *inode, struct file *file)
+{
+	struct task_struct *task = pid_task(proc_pid(inode), PIDTYPE_PID);
+	struct mm_struct *mm;
+
+	if (task == NULL)
+		return -ENOENT;
+
+	mm = get_task_mm(task);
+	if (mm == NULL)
+		return -EINVAL;
+
+	file->private_data = mm;
+	return 0;
+}
+
+static int proc_pid_mm_release(struct inode *inode, struct file *file)
+{
+	struct mm_struct *mm = file->private_data;
+
+	if(mm != NULL)
+		mmput(mm);
+
+	return 0;
+}
+
+const struct file_operations proc_pid_mm_operations = {
+	.open		= proc_pid_mm_open,
+	.release	= proc_pid_mm_release,
+};
+
 /*
  * Thread groups
  */

@@ -2350,6 +2381,7 @@ static const struct pid_entry tgid_base_stuff[] = {
 #ifdef CONFIG_TASK_IO_ACCOUNTING
 	INF("io",	S_IRUGO, pid_io_accounting),
 #endif
+	REG("mm", S_IRUSR | S_IWUSR, pid_mm),
 };
 
 static int proc_tgid_base_readdir(struct file * filp,

index 6aefcd3..46f8a3f 100644
@@ -34,6 +34,15 @@ struct pt_regs {
 
 #define instruction_pointer(regs) PT_REGS_IP(regs)
 
+struct user_regs {
+	unsigned long regs[MAX_REG_NR];
+	void *ptr;
+	unsigned long fpregs[FP_SIZE];
+};
+
+extern int ptrace_to_pt_regs(struct pt_regs *to, struct user_regs __user *from);
+extern int pt_regs_to_ptrace(struct user_regs __user *to, struct pt_regs *from);
+
 struct task_struct;
 
 extern long subarch_ptrace(struct task_struct *child, long request, long addr,

index b2d24c5..8c9c160 100644
@@ -8,8 +8,11 @@
 
 #define HOST_AUDIT_ARCH AUDIT_ARCH_I386
 
-#include "linux/compiler.h"
-#include "asm/ptrace-generic.h"
+#include "user_constants.h"
+#define FP_SIZE ((HOST_XFP_SIZE > HOST_FP_SIZE) ? HOST_XFP_SIZE : HOST_FP_SIZE)
+
+#include <linux/compiler.h>
+#include <asm/ptrace-generic.h>
 #include <asm/user.h>
 #include "sysdep/ptrace.h"
 

@@ -40,6 +43,12 @@
 
 #define user_mode(r) UPT_IS_USER(&(r)->regs)
 
+#define pt_regs_ip(r) (r).regs.gp[EIP]
+#define pt_regs_sp(r) (r).regs.gp[UESP]
+
+#define ptrace_ip(r) (r)->regs[EIP]
+#define ptrace_sp(r) (r)->regs[UESP]
+
 /*
  * Forward declaration to avoid including sysdep/tls.h, which causes a
  * circular include, and compilation failures.

index 4c47535..21345b5 100644
@@ -7,6 +7,9 @@
 #ifndef __UM_PTRACE_X86_64_H
 #define __UM_PTRACE_X86_64_H
 
+#include "user_constants.h"
+#define FP_SIZE (HOST_FP_SIZE)
+
 #include "linux/compiler.h"
 #include "asm/errno.h"
 #include "asm/host_ldt.h"

@@ -62,6 +65,12 @@
 
 #define PT_FIX_EXEC_STACK(sp) do ; while(0)
 
+#define pt_regs_ip(r) (r).regs.gp[RIP / sizeof(long)]
+#define pt_regs_sp(r) (r).regs.gp[RSP / sizeof(long)]
+
+#define ptrace_ip(r) (r)->regs[RIP / sizeof(long)]
+#define ptrace_sp(r) (r)->regs[RSP / sizeof(long)]
+
 #define profile_pc(regs) PT_REGS_IP(regs)
 
 static inline int ptrace_get_thread_area(struct task_struct *child, int idx,

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index 984123a..5f8f291 100644
@@ -332,6 +332,8 @@
 #define __NR_fallocate		324
 #define __NR_timerfd_settime	325
 #define __NR_timerfd_gettime	326
+#define __NR_new_mm		327
+#define __NR_switch_mm		328
 
 #ifdef __KERNEL__
 

index 3883ceb..a674098 100644
@@ -639,6 +639,10 @@ __SYSCALL(__NR_fallocate, sys_fallocate)
 __SYSCALL(__NR_timerfd_settime, sys_timerfd_settime)
 #define __NR_timerfd_gettime			287
 __SYSCALL(__NR_timerfd_gettime, sys_timerfd_gettime)
+#define __NR_new_mm				288
+__SYSCALL(__NR_new_mm, sys_new_mm)
+#define __NR_switch_mm				289
+__SYSCALL(__NR_switch_mm, stub_switch_mm)
 
 
 #ifndef __NO_STUBS

index ebe0c17..a8ef98a 100644
@@ -21,6 +21,8 @@
 
 #define PTRACE_SYSCALL		  24
 
+#define PTRACE_SWITCH_MM	  34
+
 /* 0x4200-0x4300 are reserved for architecture-independent additions.  */
 #define PTRACE_SETOPTIONS	0x4200
 #define PTRACE_GETEVENTMSG	0x4201

index 6a1e7af..7360fde 100644
@@ -1750,6 +1750,7 @@ static inline int sas_ss_flags(unsigned long sp)
  * Routines for handling mm_structs
  */
 extern struct mm_struct * mm_alloc(void);
+extern struct mm_struct *dup_mm(struct task_struct *tsk);
 
 /* mmdrop drops the mm and the page tables */
 extern void __mmdrop(struct mm_struct *);

index 9c042f9..4ca580a 100644
@@ -498,7 +498,7 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
  * Allocate a new mm structure and copy contents from the
  * mm structure of the passed in task structure.
  */
-static struct mm_struct *dup_mm(struct task_struct *tsk)
+struct mm_struct *dup_mm(struct task_struct *tsk)
 {
 	struct mm_struct *mm, *oldmm = current->mm;
 	int err;

index fdb34e8..2200f84 100644
@@ -420,6 +420,8 @@ static int ptrace_resume(struct task_struct *child, long request, long data)
 	return 0;
 }
 
+extern int do_switch(struct task_struct *task, int fd);
+
 int ptrace_request(struct task_struct *child, long request,
 		   long addr, long data)
 {

@@ -471,6 +473,10 @@ int ptrace_request(struct task_struct *child, long request,
 			return 0;
 		return ptrace_resume(child, request, SIGKILL);
 
+	case PTRACE_SWITCH_MM:
+		ret = do_switch(child, data);
+		break;
+
 	default:
 		break;
 	}

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