x86_64: prepare shared kernel/ptrace.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 627 deletions

diff --git a/arch/x86_64/kernel/ptrace.c b/arch/x86_64/kernel/ptrace.c
deleted file mode 100644
index eea3702427b40..0000000000000
--- a/arch/x86_64/kernel/ptrace.c
+++ /dev/null
@@ -1,627 +0,0 @@
-/* ptrace.c */
-/* By Ross Biro 1/23/92 */
-/*
- * Pentium III FXSR, SSE support
- *	Gareth Hughes <gareth@valinux.com>, May 2000
- * 
- * x86-64 port 2000-2002 Andi Kleen
- */
-
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/errno.h>
-#include <linux/ptrace.h>
-#include <linux/user.h>
-#include <linux/security.h>
-#include <linux/audit.h>
-#include <linux/seccomp.h>
-#include <linux/signal.h>
-
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-#include <asm/processor.h>
-#include <asm/i387.h>
-#include <asm/debugreg.h>
-#include <asm/ldt.h>
-#include <asm/desc.h>
-#include <asm/proto.h>
-#include <asm/ia32.h>
-
-/*
- * does not yet catch signals sent when the child dies.
- * in exit.c or in signal.c.
- */
-
-/*
- * Determines which flags the user has access to [1 = access, 0 = no access].
- * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), IOPL(12-13), IF(9).
- * Also masks reserved bits (63-22, 15, 5, 3, 1).
- */
-#define FLAG_MASK 0x54dd5UL
-
-/* set's the trap flag. */
-#define TRAP_FLAG 0x100UL
-
-/*
- * eflags and offset of eflags on child stack..
- */
-#define EFLAGS offsetof(struct pt_regs, eflags)
-#define EFL_OFFSET ((int)(EFLAGS-sizeof(struct pt_regs)))
-
-/*
- * this routine will get a word off of the processes privileged stack. 
- * the offset is how far from the base addr as stored in the TSS.  
- * this routine assumes that all the privileged stacks are in our
- * data space.
- */   
-static inline unsigned long get_stack_long(struct task_struct *task, int offset)
-{
-	unsigned char *stack;
-
-	stack = (unsigned char *)task->thread.rsp0;
-	stack += offset;
-	return (*((unsigned long *)stack));
-}
-
-/*
- * this routine will put a word on the processes privileged stack. 
- * the offset is how far from the base addr as stored in the TSS.  
- * this routine assumes that all the privileged stacks are in our
- * data space.
- */
-static inline long put_stack_long(struct task_struct *task, int offset,
-	unsigned long data)
-{
-	unsigned char * stack;
-
-	stack = (unsigned char *) task->thread.rsp0;
-	stack += offset;
-	*(unsigned long *) stack = data;
-	return 0;
-}
-
-#define LDT_SEGMENT 4
-
-unsigned long convert_rip_to_linear(struct task_struct *child, struct pt_regs *regs)
-{
-	unsigned long addr, seg;
-
-	addr = regs->rip;
-	seg = regs->cs & 0xffff;
-
-	/*
-	 * We'll assume that the code segments in the GDT
-	 * are all zero-based. That is largely true: the
-	 * TLS segments are used for data, and the PNPBIOS
-	 * and APM bios ones we just ignore here.
-	 */
-	if (seg & LDT_SEGMENT) {
-		u32 *desc;
-		unsigned long base;
-
-		seg &= ~7UL;
-
-		down(&child->mm->context.sem);
-		if (unlikely((seg >> 3) >= child->mm->context.size))
-			addr = -1L; /* bogus selector, access would fault */
-		else {
-			desc = child->mm->context.ldt + seg;
-			base = ((desc[0] >> 16) |
-				((desc[1] & 0xff) << 16) |
-				(desc[1] & 0xff000000));
-
-			/* 16-bit code segment? */
-			if (!((desc[1] >> 22) & 1))
-				addr &= 0xffff;
-			addr += base;
-		}
-		up(&child->mm->context.sem);
-	}
-
-	return addr;
-}
-
-static int is_setting_trap_flag(struct task_struct *child, struct pt_regs *regs)
-{
-	int i, copied;
-	unsigned char opcode[15];
-	unsigned long addr = convert_rip_to_linear(child, regs);
-
-	copied = access_process_vm(child, addr, opcode, sizeof(opcode), 0);
-	for (i = 0; i < copied; i++) {
-		switch (opcode[i]) {
-		/* popf and iret */
-		case 0x9d: case 0xcf:
-			return 1;
-
-			/* CHECKME: 64 65 */
-
-		/* opcode and address size prefixes */
-		case 0x66: case 0x67:
-			continue;
-		/* irrelevant prefixes (segment overrides and repeats) */
-		case 0x26: case 0x2e:
-		case 0x36: case 0x3e:
-		case 0x64: case 0x65:
-		case 0xf2: case 0xf3:
-			continue;
-
-		case 0x40 ... 0x4f:
-			if (regs->cs != __USER_CS)
-				/* 32-bit mode: register increment */
-				return 0;
-			/* 64-bit mode: REX prefix */
-			continue;
-
-			/* CHECKME: f2, f3 */
-
-		/*
-		 * pushf: NOTE! We should probably not let
-		 * the user see the TF bit being set. But
-		 * it's more pain than it's worth to avoid
-		 * it, and a debugger could emulate this
-		 * all in user space if it _really_ cares.
-		 */
-		case 0x9c:
-		default:
-			return 0;
-		}
-	}
-	return 0;
-}
-
-static void set_singlestep(struct task_struct *child)
-{
-	struct pt_regs *regs = task_pt_regs(child);
-
-	/*
-	 * Always set TIF_SINGLESTEP - this guarantees that
-	 * we single-step system calls etc..  This will also
-	 * cause us to set TF when returning to user mode.
-	 */
-	set_tsk_thread_flag(child, TIF_SINGLESTEP);
-
-	/*
-	 * If TF was already set, don't do anything else
-	 */
-	if (regs->eflags & TRAP_FLAG)
-		return;
-
-	/* Set TF on the kernel stack.. */
-	regs->eflags |= TRAP_FLAG;
-
-	/*
-	 * ..but if TF is changed by the instruction we will trace,
-	 * don't mark it as being "us" that set it, so that we
-	 * won't clear it by hand later.
-	 */
-	if (is_setting_trap_flag(child, regs))
-		return;
-
-	child->ptrace |= PT_DTRACE;
-}
-
-static void clear_singlestep(struct task_struct *child)
-{
-	/* Always clear TIF_SINGLESTEP... */
-	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
-
-	/* But touch TF only if it was set by us.. */
-	if (child->ptrace & PT_DTRACE) {
-		struct pt_regs *regs = task_pt_regs(child);
-		regs->eflags &= ~TRAP_FLAG;
-		child->ptrace &= ~PT_DTRACE;
-	}
-}
-
-/*
- * Called by kernel/ptrace.c when detaching..
- *
- * Make sure the single step bit is not set.
- */
-void ptrace_disable(struct task_struct *child)
-{ 
-	clear_singlestep(child);
-}
-
-static int putreg(struct task_struct *child,
-	unsigned long regno, unsigned long value)
-{
-	unsigned long tmp; 
-	
-	switch (regno) {
-		case offsetof(struct user_regs_struct,fs):
-			if (value && (value & 3) != 3)
-				return -EIO;
-			child->thread.fsindex = value & 0xffff; 
-			return 0;
-		case offsetof(struct user_regs_struct,gs):
-			if (value && (value & 3) != 3)
-				return -EIO;
-			child->thread.gsindex = value & 0xffff;
-			return 0;
-		case offsetof(struct user_regs_struct,ds):
-			if (value && (value & 3) != 3)
-				return -EIO;
-			child->thread.ds = value & 0xffff;
-			return 0;
-		case offsetof(struct user_regs_struct,es): 
-			if (value && (value & 3) != 3)
-				return -EIO;
-			child->thread.es = value & 0xffff;
-			return 0;
-		case offsetof(struct user_regs_struct,ss):
-			if ((value & 3) != 3)
-				return -EIO;
-			value &= 0xffff;
-			return 0;
-		case offsetof(struct user_regs_struct,fs_base):
-			if (value >= TASK_SIZE_OF(child))
-				return -EIO;
-			child->thread.fs = value;
-			return 0;
-		case offsetof(struct user_regs_struct,gs_base):
-			if (value >= TASK_SIZE_OF(child))
-				return -EIO;
-			child->thread.gs = value;
-			return 0;
-		case offsetof(struct user_regs_struct, eflags):
-			value &= FLAG_MASK;
-			tmp = get_stack_long(child, EFL_OFFSET); 
-			tmp &= ~FLAG_MASK; 
-			value |= tmp;
-			break;
-		case offsetof(struct user_regs_struct,cs): 
-			if ((value & 3) != 3)
-				return -EIO;
-			value &= 0xffff;
-			break;
-	}
-	put_stack_long(child, regno - sizeof(struct pt_regs), value);
-	return 0;
-}
-
-static unsigned long getreg(struct task_struct *child, unsigned long regno)
-{
-	unsigned long val;
-	switch (regno) {
-		case offsetof(struct user_regs_struct, fs):
-			return child->thread.fsindex;
-		case offsetof(struct user_regs_struct, gs):
-			return child->thread.gsindex;
-		case offsetof(struct user_regs_struct, ds):
-			return child->thread.ds;
-		case offsetof(struct user_regs_struct, es):
-			return child->thread.es; 
-		case offsetof(struct user_regs_struct, fs_base):
-			return child->thread.fs;
-		case offsetof(struct user_regs_struct, gs_base):
-			return child->thread.gs;
-		default:
-			regno = regno - sizeof(struct pt_regs);
-			val = get_stack_long(child, regno);
-			if (test_tsk_thread_flag(child, TIF_IA32))
-				val &= 0xffffffff;
-			return val;
-	}
-
-}
-
-long arch_ptrace(struct task_struct *child, long request, long addr, long data)
-{
-	long i, ret;
-	unsigned ui;
-
-	switch (request) {
-	/* when I and D space are separate, these will need to be fixed. */
-	case PTRACE_PEEKTEXT: /* read word at location addr. */ 
-	case PTRACE_PEEKDATA:
-		ret = generic_ptrace_peekdata(child, addr, data);
-		break;
-
-	/* read the word at location addr in the USER area. */
-	case PTRACE_PEEKUSR: {
-		unsigned long tmp;
-
-		ret = -EIO;
-		if ((addr & 7) ||
-		    addr > sizeof(struct user) - 7)
-			break;
-
-		switch (addr) { 
-		case 0 ... sizeof(struct user_regs_struct) - sizeof(long):
-			tmp = getreg(child, addr);
-			break;
-		case offsetof(struct user, u_debugreg[0]):
-			tmp = child->thread.debugreg0;
-			break;
-		case offsetof(struct user, u_debugreg[1]):
-			tmp = child->thread.debugreg1;
-			break;
-		case offsetof(struct user, u_debugreg[2]):
-			tmp = child->thread.debugreg2;
-			break;
-		case offsetof(struct user, u_debugreg[3]):
-			tmp = child->thread.debugreg3;
-			break;
-		case offsetof(struct user, u_debugreg[6]):
-			tmp = child->thread.debugreg6;
-			break;
-		case offsetof(struct user, u_debugreg[7]):
-			tmp = child->thread.debugreg7;
-			break;
-		default:
-			tmp = 0;
-			break;
-		}
-		ret = put_user(tmp,(unsigned long __user *) data);
-		break;
-	}
-
-	/* when I and D space are separate, this will have to be fixed. */
-	case PTRACE_POKETEXT: /* write the word at location addr. */
-	case PTRACE_POKEDATA:
-		ret = generic_ptrace_pokedata(child, addr, data);
-		break;
-
-	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
-	{
-		int dsize = test_tsk_thread_flag(child, TIF_IA32) ? 3 : 7;
-		ret = -EIO;
-		if ((addr & 7) ||
-		    addr > sizeof(struct user) - 7)
-			break;
-
-		switch (addr) { 
-		case 0 ... sizeof(struct user_regs_struct) - sizeof(long):
-			ret = putreg(child, addr, data);
-			break;
-		/* Disallows to set a breakpoint into the vsyscall */
-		case offsetof(struct user, u_debugreg[0]):
-			if (data >= TASK_SIZE_OF(child) - dsize) break;
-			child->thread.debugreg0 = data;
-			ret = 0;
-			break;
-		case offsetof(struct user, u_debugreg[1]):
-			if (data >= TASK_SIZE_OF(child) - dsize) break;
-			child->thread.debugreg1 = data;
-			ret = 0;
-			break;
-		case offsetof(struct user, u_debugreg[2]):
-			if (data >= TASK_SIZE_OF(child) - dsize) break;
-			child->thread.debugreg2 = data;
-			ret = 0;
-			break;
-		case offsetof(struct user, u_debugreg[3]):
-			if (data >= TASK_SIZE_OF(child) - dsize) break;
-			child->thread.debugreg3 = data;
-			ret = 0;
-			break;
-		case offsetof(struct user, u_debugreg[6]):
-				  if (data >> 32)
-				break; 
-			child->thread.debugreg6 = data;
-			ret = 0;
-			break;
-		case offsetof(struct user, u_debugreg[7]):
-			/* See arch/i386/kernel/ptrace.c for an explanation of
-			 * this awkward check.*/
-			data &= ~DR_CONTROL_RESERVED;
-			for(i=0; i<4; i++)
-				if ((0x5554 >> ((data >> (16 + 4*i)) & 0xf)) & 1)
-					break;
-			if (i == 4) {
-			  child->thread.debugreg7 = data;
-			  if (data)
-			  	set_tsk_thread_flag(child, TIF_DEBUG);
-			  else
-			  	clear_tsk_thread_flag(child, TIF_DEBUG);
-			  ret = 0;
-		  	}
-		  break;
-		}
-		break;
-	}
-	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
-	case PTRACE_CONT:    /* restart after signal. */
-
-		ret = -EIO;
-		if (!valid_signal(data))
-			break;
-		if (request == PTRACE_SYSCALL)
-			set_tsk_thread_flag(child,TIF_SYSCALL_TRACE);
-		else
-			clear_tsk_thread_flag(child,TIF_SYSCALL_TRACE);
-		clear_tsk_thread_flag(child, TIF_SINGLESTEP);
-		child->exit_code = data;
-		/* make sure the single step bit is not set. */
-		clear_singlestep(child);
-		wake_up_process(child);
-		ret = 0;
-		break;
-
-#ifdef CONFIG_IA32_EMULATION
-		/* This makes only sense with 32bit programs. Allow a
-		   64bit debugger to fully examine them too. Better
-		   don't use it against 64bit processes, use
-		   PTRACE_ARCH_PRCTL instead. */
-	case PTRACE_SET_THREAD_AREA: {
-		struct user_desc __user *p;
-		int old; 
-		p = (struct user_desc __user *)data;
-		get_user(old,  &p->entry_number); 
-		put_user(addr, &p->entry_number);
-		ret = do_set_thread_area(&child->thread, p);
-		put_user(old,  &p->entry_number); 
-		break;
-	case PTRACE_GET_THREAD_AREA:
-		p = (struct user_desc __user *)data;
-		get_user(old,  &p->entry_number); 
-		put_user(addr, &p->entry_number);
-		ret = do_get_thread_area(&child->thread, p);
-		put_user(old,  &p->entry_number); 
-		break;
-	} 
-#endif
-		/* normal 64bit interface to access TLS data. 
-		   Works just like arch_prctl, except that the arguments
-		   are reversed. */
-	case PTRACE_ARCH_PRCTL: 
-		ret = do_arch_prctl(child, data, addr);
-		break;
-
-/*
- * make the child exit.  Best I can do is send it a sigkill. 
- * perhaps it should be put in the status that it wants to 
- * exit.
- */
-	case PTRACE_KILL:
-		ret = 0;
-		if (child->exit_state == EXIT_ZOMBIE)	/* already dead */
-			break;
-		clear_tsk_thread_flag(child, TIF_SINGLESTEP);
-		child->exit_code = SIGKILL;
-		/* make sure the single step bit is not set. */
-		clear_singlestep(child);
-		wake_up_process(child);
-		break;
-
-	case PTRACE_SINGLESTEP:    /* set the trap flag. */
-		ret = -EIO;
-		if (!valid_signal(data))
-			break;
-		clear_tsk_thread_flag(child,TIF_SYSCALL_TRACE);
-		set_singlestep(child);
-		child->exit_code = data;
-		/* give it a chance to run. */
-		wake_up_process(child);
-		ret = 0;
-		break;
-
-	case PTRACE_DETACH:
-		/* detach a process that was attached. */
-		ret = ptrace_detach(child, data);
-		break;
-
-	case PTRACE_GETREGS: { /* Get all gp regs from the child. */
-	  	if (!access_ok(VERIFY_WRITE, (unsigned __user *)data,
-			       sizeof(struct user_regs_struct))) {
-			ret = -EIO;
-			break;
-		}
-		ret = 0;
-		for (ui = 0; ui < sizeof(struct user_regs_struct); ui += sizeof(long)) {
-			ret |= __put_user(getreg(child, ui),(unsigned long __user *) data);
-			data += sizeof(long);
-		}
-		break;
-	}
-
-	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
-		unsigned long tmp;
-	  	if (!access_ok(VERIFY_READ, (unsigned __user *)data,
-			       sizeof(struct user_regs_struct))) {
-			ret = -EIO;
-			break;
-		}
-		ret = 0;
-		for (ui = 0; ui < sizeof(struct user_regs_struct); ui += sizeof(long)) {
-			ret = __get_user(tmp, (unsigned long __user *) data);
-			if (ret)
-				break;
-			ret = putreg(child, ui, tmp);
-			if (ret)
-				break;
-			data += sizeof(long);
-		}
-		break;
-	}
-
-	case PTRACE_GETFPREGS: { /* Get the child extended FPU state. */
-		if (!access_ok(VERIFY_WRITE, (unsigned __user *)data,
-			       sizeof(struct user_i387_struct))) {
-			ret = -EIO;
-			break;
-		}
-		ret = get_fpregs((struct user_i387_struct __user *)data, child);
-		break;
-	}
-
-	case PTRACE_SETFPREGS: { /* Set the child extended FPU state. */
-		if (!access_ok(VERIFY_READ, (unsigned __user *)data,
-			       sizeof(struct user_i387_struct))) {
-			ret = -EIO;
-			break;
-		}
-		set_stopped_child_used_math(child);
-		ret = set_fpregs(child, (struct user_i387_struct __user *)data);
-		break;
-	}
-
-	default:
-		ret = ptrace_request(child, request, addr, data);
-		break;
-	}
-	return ret;
-}
-
-static void syscall_trace(struct pt_regs *regs)
-{
-
-#if 0
-	printk("trace %s rip %lx rsp %lx rax %d origrax %d caller %lx tiflags %x ptrace %x\n",
-	       current->comm,
-	       regs->rip, regs->rsp, regs->rax, regs->orig_rax, __builtin_return_address(0),
-	       current_thread_info()->flags, current->ptrace); 
-#endif
-
-	ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
-				? 0x80 : 0));
-	/*
-	 * this isn't the same as continuing with a signal, but it will do
-	 * for normal use.  strace only continues with a signal if the
-	 * stopping signal is not SIGTRAP.  -brl
-	 */
-	if (current->exit_code) {
-		send_sig(current->exit_code, current, 1);
-		current->exit_code = 0;
-	}
-}
-
-asmlinkage void syscall_trace_enter(struct pt_regs *regs)
-{
-	/* do the secure computing check first */
-	secure_computing(regs->orig_rax);
-
-	if (test_thread_flag(TIF_SYSCALL_TRACE)
-	    && (current->ptrace & PT_PTRACED))
-		syscall_trace(regs);
-
-	if (unlikely(current->audit_context)) {
-		if (test_thread_flag(TIF_IA32)) {
-			audit_syscall_entry(AUDIT_ARCH_I386,
-					    regs->orig_rax,
-					    regs->rbx, regs->rcx,
-					    regs->rdx, regs->rsi);
-		} else {
-			audit_syscall_entry(AUDIT_ARCH_X86_64,
-					    regs->orig_rax,
-					    regs->rdi, regs->rsi,
-					    regs->rdx, regs->r10);
-		}
-	}
-}
-
-asmlinkage void syscall_trace_leave(struct pt_regs *regs)
-{
-	if (unlikely(current->audit_context))
-		audit_syscall_exit(AUDITSC_RESULT(regs->rax), regs->rax);
-
-	if ((test_thread_flag(TIF_SYSCALL_TRACE)
-	     || test_thread_flag(TIF_SINGLESTEP))
-	    && (current->ptrace & PT_PTRACED))
-		syscall_trace(regs);
-}