mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
277 lines
6 KiB
C
277 lines
6 KiB
C
/*
|
|
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/ptrace-abi.h>
|
|
#include <skas.h>
|
|
|
|
extern int arch_switch_tls(struct task_struct *to);
|
|
|
|
void arch_switch_to(struct task_struct *to)
|
|
{
|
|
int err = arch_switch_tls(to);
|
|
if (!err)
|
|
return;
|
|
|
|
if (err != -EINVAL)
|
|
printk(KERN_WARNING "arch_switch_tls failed, errno %d, "
|
|
"not EINVAL\n", -err);
|
|
else
|
|
printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n");
|
|
}
|
|
|
|
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),
|
|
FOLL_FORCE);
|
|
if (n != sizeof(instr)) {
|
|
printk(KERN_ERR "is_syscall : failed to read "
|
|
"instruction from 0x%lx\n", addr);
|
|
return 1;
|
|
}
|
|
}
|
|
/* int 0x80 or sysenter */
|
|
return (instr == 0x80cd) || (instr == 0x340f);
|
|
}
|
|
|
|
/* determines which flags the user has access to. */
|
|
/* 1 = access 0 = no access */
|
|
#define FLAG_MASK 0x00044dd5
|
|
|
|
static const int reg_offsets[] = {
|
|
[EBX] = HOST_BX,
|
|
[ECX] = HOST_CX,
|
|
[EDX] = HOST_DX,
|
|
[ESI] = HOST_SI,
|
|
[EDI] = HOST_DI,
|
|
[EBP] = HOST_BP,
|
|
[EAX] = HOST_AX,
|
|
[DS] = HOST_DS,
|
|
[ES] = HOST_ES,
|
|
[FS] = HOST_FS,
|
|
[GS] = HOST_GS,
|
|
[EIP] = HOST_IP,
|
|
[CS] = HOST_CS,
|
|
[EFL] = HOST_EFLAGS,
|
|
[UESP] = HOST_SP,
|
|
[SS] = HOST_SS,
|
|
[ORIG_EAX] = HOST_ORIG_AX,
|
|
};
|
|
|
|
int putreg(struct task_struct *child, int regno, unsigned long value)
|
|
{
|
|
regno >>= 2;
|
|
switch (regno) {
|
|
case EBX:
|
|
case ECX:
|
|
case EDX:
|
|
case ESI:
|
|
case EDI:
|
|
case EBP:
|
|
case EAX:
|
|
case EIP:
|
|
case UESP:
|
|
break;
|
|
case ORIG_EAX:
|
|
/* Update the syscall number. */
|
|
UPT_SYSCALL_NR(&child->thread.regs.regs) = value;
|
|
break;
|
|
case FS:
|
|
if (value && (value & 3) != 3)
|
|
return -EIO;
|
|
break;
|
|
case GS:
|
|
if (value && (value & 3) != 3)
|
|
return -EIO;
|
|
break;
|
|
case DS:
|
|
case ES:
|
|
if (value && (value & 3) != 3)
|
|
return -EIO;
|
|
value &= 0xffff;
|
|
break;
|
|
case SS:
|
|
case CS:
|
|
if ((value & 3) != 3)
|
|
return -EIO;
|
|
value &= 0xffff;
|
|
break;
|
|
case EFL:
|
|
value &= FLAG_MASK;
|
|
child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
|
|
return 0;
|
|
default :
|
|
panic("Bad register in putreg() : %d\n", regno);
|
|
}
|
|
child->thread.regs.regs.gp[reg_offsets[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 mask = ~0UL;
|
|
|
|
regno >>= 2;
|
|
switch (regno) {
|
|
case FS:
|
|
case GS:
|
|
case DS:
|
|
case ES:
|
|
case SS:
|
|
case CS:
|
|
mask = 0xffff;
|
|
break;
|
|
case EIP:
|
|
case UESP:
|
|
case EAX:
|
|
case EBX:
|
|
case ECX:
|
|
case EDX:
|
|
case ESI:
|
|
case EDI:
|
|
case EBP:
|
|
case EFL:
|
|
case ORIG_EAX:
|
|
break;
|
|
default:
|
|
panic("Bad register in getreg() : %d\n", regno);
|
|
}
|
|
return mask & child->thread.regs.regs.gp[reg_offsets[regno]];
|
|
}
|
|
|
|
/* read the word at location addr in the USER area. */
|
|
int peek_user(struct task_struct *child, long addr, long data)
|
|
{
|
|
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 __user *) data);
|
|
}
|
|
|
|
static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
|
|
{
|
|
int err, n, cpu = task_cpu(child);
|
|
struct user_i387_struct fpregs;
|
|
|
|
err = save_i387_registers(userspace_pid[cpu],
|
|
(unsigned long *) &fpregs);
|
|
if (err)
|
|
return err;
|
|
|
|
n = copy_to_user(buf, &fpregs, sizeof(fpregs));
|
|
if(n > 0)
|
|
return -EFAULT;
|
|
|
|
return n;
|
|
}
|
|
|
|
static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
|
|
{
|
|
int n, cpu = task_cpu(child);
|
|
struct user_i387_struct fpregs;
|
|
|
|
n = copy_from_user(&fpregs, buf, sizeof(fpregs));
|
|
if (n > 0)
|
|
return -EFAULT;
|
|
|
|
return restore_i387_registers(userspace_pid[cpu],
|
|
(unsigned long *) &fpregs);
|
|
}
|
|
|
|
static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
|
|
{
|
|
int err, n, cpu = task_cpu(child);
|
|
struct user_fxsr_struct fpregs;
|
|
|
|
err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
|
|
if (err)
|
|
return err;
|
|
|
|
n = copy_to_user(buf, &fpregs, sizeof(fpregs));
|
|
if(n > 0)
|
|
return -EFAULT;
|
|
|
|
return n;
|
|
}
|
|
|
|
static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
|
|
{
|
|
int n, cpu = task_cpu(child);
|
|
struct user_fxsr_struct fpregs;
|
|
|
|
n = copy_from_user(&fpregs, buf, sizeof(fpregs));
|
|
if (n > 0)
|
|
return -EFAULT;
|
|
|
|
return restore_fpx_registers(userspace_pid[cpu],
|
|
(unsigned long *) &fpregs);
|
|
}
|
|
|
|
long subarch_ptrace(struct task_struct *child, long request,
|
|
unsigned long addr, unsigned long data)
|
|
{
|
|
int ret = -EIO;
|
|
void __user *datap = (void __user *) data;
|
|
switch (request) {
|
|
case PTRACE_GETFPREGS: /* Get the child FPU state. */
|
|
ret = get_fpregs(datap, child);
|
|
break;
|
|
case PTRACE_SETFPREGS: /* Set the child FPU state. */
|
|
ret = set_fpregs(datap, child);
|
|
break;
|
|
case PTRACE_GETFPXREGS: /* Get the child FPU state. */
|
|
ret = get_fpxregs(datap, child);
|
|
break;
|
|
case PTRACE_SETFPXREGS: /* Set the child FPU state. */
|
|
ret = set_fpxregs(datap, child);
|
|
break;
|
|
default:
|
|
ret = -EIO;
|
|
}
|
|
return ret;
|
|
}
|