mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Jeff Dike](/assets/img/avatar_default.png)
Style fixes in arch/um/sys-x86_64: updated copyrights CodingStyle fixes added severities to printks which needed them A bunch of functions in sys-*/ptrace_user.c turn out to be unused, so they and their declarations are gone. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
195 lines
4.3 KiB
C
195 lines
4.3 KiB
C
/*
|
|
* Copyright 2003 PathScale, Inc.
|
|
* Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
*
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/errno.h>
|
|
#define __FRAME_OFFSETS
|
|
#include <asm/ptrace.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
/*
|
|
* determines which flags the user has access to.
|
|
* 1 = access 0 = no access
|
|
*/
|
|
#define FLAG_MASK 0x44dd5UL
|
|
|
|
int putreg(struct task_struct *child, int regno, unsigned long value)
|
|
{
|
|
unsigned long tmp;
|
|
|
|
#ifdef TIF_IA32
|
|
/*
|
|
* Some code in the 64bit emulation may not be 64bit clean.
|
|
* Don't take any chances.
|
|
*/
|
|
if (test_tsk_thread_flag(child, TIF_IA32))
|
|
value &= 0xffffffff;
|
|
#endif
|
|
switch (regno) {
|
|
case FS:
|
|
case GS:
|
|
case DS:
|
|
case ES:
|
|
case SS:
|
|
case CS:
|
|
if (value && (value & 3) != 3)
|
|
return -EIO;
|
|
value &= 0xffff;
|
|
break;
|
|
|
|
case FS_BASE:
|
|
case GS_BASE:
|
|
if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
|
|
return -EIO;
|
|
break;
|
|
|
|
case EFLAGS:
|
|
value &= FLAG_MASK;
|
|
tmp = PT_REGS_EFLAGS(&child->thread.regs) & ~FLAG_MASK;
|
|
value |= tmp;
|
|
break;
|
|
}
|
|
|
|
PT_REGS_SET(&child->thread.regs, regno, value);
|
|
return 0;
|
|
}
|
|
|
|
int poke_user(struct task_struct *child, long addr, long data)
|
|
{
|
|
if ((addr & 3) || addr < 0)
|
|
return -EIO;
|
|
|
|
if (addr < MAX_REG_OFFSET)
|
|
return putreg(child, addr, data);
|
|
else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
|
|
(addr <= offsetof(struct user, u_debugreg[7]))) {
|
|
addr -= offsetof(struct user, u_debugreg[0]);
|
|
addr = addr >> 2;
|
|
if ((addr == 4) || (addr == 5))
|
|
return -EIO;
|
|
child->thread.arch.debugregs[addr] = data;
|
|
return 0;
|
|
}
|
|
return -EIO;
|
|
}
|
|
|
|
unsigned long getreg(struct task_struct *child, int regno)
|
|
{
|
|
unsigned long retval = ~0UL;
|
|
switch (regno) {
|
|
case FS:
|
|
case GS:
|
|
case DS:
|
|
case ES:
|
|
case SS:
|
|
case CS:
|
|
retval = 0xffff;
|
|
/* fall through */
|
|
default:
|
|
retval &= PT_REG(&child->thread.regs, regno);
|
|
#ifdef TIF_IA32
|
|
if (test_tsk_thread_flag(child, TIF_IA32))
|
|
retval &= 0xffffffff;
|
|
#endif
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
int peek_user(struct task_struct *child, long addr, long data)
|
|
{
|
|
/* read the word at location addr in the USER area. */
|
|
unsigned long tmp;
|
|
|
|
if ((addr & 3) || addr < 0)
|
|
return -EIO;
|
|
|
|
tmp = 0; /* Default return condition */
|
|
if (addr < MAX_REG_OFFSET)
|
|
tmp = getreg(child, addr);
|
|
else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
|
|
(addr <= offsetof(struct user, u_debugreg[7]))) {
|
|
addr -= offsetof(struct user, u_debugreg[0]);
|
|
addr = addr >> 2;
|
|
tmp = child->thread.arch.debugregs[addr];
|
|
}
|
|
return put_user(tmp, (unsigned long *) data);
|
|
}
|
|
|
|
/* XXX Mostly copied from sys-i386 */
|
|
int is_syscall(unsigned long addr)
|
|
{
|
|
unsigned short instr;
|
|
int n;
|
|
|
|
n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
|
|
if (n) {
|
|
/*
|
|
* access_process_vm() grants access to vsyscall and stub,
|
|
* while copy_from_user doesn't. Maybe access_process_vm is
|
|
* slow, but that doesn't matter, since it will be called only
|
|
* in case of singlestepping, if copy_from_user failed.
|
|
*/
|
|
n = access_process_vm(current, addr, &instr, sizeof(instr), 0);
|
|
if (n != sizeof(instr)) {
|
|
printk("is_syscall : failed to read instruction from "
|
|
"0x%lx\n", addr);
|
|
return 1;
|
|
}
|
|
}
|
|
/* sysenter */
|
|
return instr == 0x050f;
|
|
}
|
|
|
|
int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
|
|
{
|
|
int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
|
|
long fpregs[HOST_FP_SIZE];
|
|
|
|
BUG_ON(sizeof(*buf) != sizeof(fpregs));
|
|
err = save_fp_registers(userspace_pid[cpu], fpregs);
|
|
if (err)
|
|
return err;
|
|
|
|
n = copy_to_user(buf, fpregs, sizeof(fpregs));
|
|
if (n > 0)
|
|
return -EFAULT;
|
|
|
|
return n;
|
|
}
|
|
|
|
int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
|
|
{
|
|
int n, cpu = ((struct thread_info *) child->stack)->cpu;
|
|
long fpregs[HOST_FP_SIZE];
|
|
|
|
BUG_ON(sizeof(*buf) != sizeof(fpregs));
|
|
n = copy_from_user(fpregs, buf, sizeof(fpregs));
|
|
if (n > 0)
|
|
return -EFAULT;
|
|
|
|
return restore_fp_registers(userspace_pid[cpu], fpregs);
|
|
}
|
|
|
|
long subarch_ptrace(struct task_struct *child, long request, long addr,
|
|
long data)
|
|
{
|
|
int ret = -EIO;
|
|
|
|
switch (request) {
|
|
case PTRACE_GETFPXREGS: /* Get the child FPU state. */
|
|
ret = get_fpregs((struct user_i387_struct __user *) data,
|
|
child);
|
|
break;
|
|
case PTRACE_SETFPXREGS: /* Set the child FPU state. */
|
|
ret = set_fpregs((struct user_i387_struct __user *) data,
|
|
child);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|