/* ptrace.c: FRV specific parts of process tracing
*
* Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
* - Derived from arch/m68k/kernel/ptrace.c
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#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/signal.h>
#include <linux/regset.h>
#include <linux/elf.h>
#include <linux/tracehook.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/unistd.h>
/*
* does not yet catch signals sent when the child dies.
* in exit.c or in signal.c.
*/
/*
* retrieve the contents of FRV userspace general registers
*/
static int genregs_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
const struct user_int_regs *iregs = &target->thread.user->i;
int ret;
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
iregs, 0, sizeof(*iregs));
if (ret < 0)
return ret;
return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
sizeof(*iregs), -1);
}
/*
* update the contents of the FRV userspace general registers
*/
static int genregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct user_int_regs *iregs = &target->thread.user->i;
unsigned int offs_gr0, offs_gr1;
int ret;
/* not allowed to set PSR or __status */
if (pos < offsetof(struct user_int_regs, psr) + sizeof(long) &&
pos + count > offsetof(struct user_int_regs, psr))
return -EIO;
if (pos < offsetof(struct user_int_regs, __status) + sizeof(long) &&
pos + count > offsetof(struct user_int_regs, __status))
return -EIO;
/* set the control regs */
offs_gr0 = offsetof(struct user_int_regs, gr[0]);
offs_gr1 = offsetof(struct user_int_regs, gr[1]);
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
iregs, 0, offs_gr0);
if (ret < 0)
return ret;
/* skip GR0/TBR */
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
offs_gr0, offs_gr1);
if (ret < 0)
return ret;
/* set the general regs */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&iregs->gr[1], offs_gr1, sizeof(*iregs));
if (ret < 0)
return ret;
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
sizeof(*iregs), -1);
}
/*
* retrieve the contents of FRV userspace FP/Media registers
*/
static int fpmregs_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
const struct user_fpmedia_regs *fpregs = &target->thread.user->f;
int ret;
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
fpregs, 0, sizeof(*fpregs));
if (ret < 0)
return ret;
return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
sizeof(*fpregs), -1);
}
/*
* update the contents of the FRV userspace FP/Media registers
*/
static int fpmregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct user_fpmedia_regs *fpregs = &target->thread.user->f;
int ret;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
fpregs, 0, sizeof(*fpregs));
if (ret < 0)
return ret;
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
sizeof(*fpregs), -1);
}
/*
* determine if the FP/Media registers have actually been used
*/
static int fpmregs_active(struct task_struct *target,
const struct user_regset *regset)
{
return tsk_used_math(target) ? regset->n : 0;
}
/*
* Define the register sets available on the FRV under Linux
*/
enum frv_regset {
REGSET_GENERAL,
REGSET_FPMEDIA,
};
static const struct user_regset frv_regsets[] = {
/*
* General register format is:
* PSR, ISR, CCR, CCCR, LR, LCR, PC, (STATUS), SYSCALLNO, ORIG_G8
* GNER0-1, IACC0, TBR, GR1-63
*/
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(long),
.align = sizeof(long),
.get = genregs_get,
.set = genregs_set,
},
/*
* FPU/Media register format is:
* FR0-63, FNER0-1, MSR0-1, ACC0-7, ACCG0-8, FSR
*/
[REGSET_FPMEDIA] = {
.core_note_type = NT_PRFPREG,
.n = sizeof(struct user_fpmedia_regs) / sizeof(long),
.size = sizeof(long),
.align = sizeof(long),
.get = fpmregs_get,
.set = fpmregs_set,
.active = fpmregs_active,
},
};
static const struct user_regset_view user_frv_native_view = {
.name = "frv",
.e_machine = EM_FRV,
.regsets = frv_regsets,
.n = ARRAY_SIZE(frv_regsets),
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_frv_native_view;
}
/*
* Get contents of register REGNO in task TASK.
*/
static inline long get_reg(struct task_struct *task, int regno)
{
struct user_context *user = task->thread.user;
if (regno < 0 || regno >= PT__END)
return 0;
return ((unsigned long *) user)[regno];
}
/*
* Write contents of register REGNO in task TASK.
*/
static inline int put_reg(struct task_struct *task, int regno,
unsigned long data)
{
struct user_context *user = task->thread.user;
if (regno < 0 || regno >= PT__END)
return -EIO;
switch (regno) {
case PT_GR(0):
return 0;
case PT_PSR:
case PT__STATUS:
return -EIO;
default:
((unsigned long *) user)[regno] = data;
return 0;
}
}
/*
* Called by kernel/ptrace.c when detaching..
*
* Control h/w single stepping
*/
void user_enable_single_step(struct task_struct *child)
{
child->thread.frame0->__status |= REG__STATUS_STEP;
}
void user_disable_single_step(struct task_struct *child)
{
child->thread.frame0->__status &= ~REG__STATUS_STEP;
}
void ptrace_disable(struct task_struct *child)
{
user_disable_single_step(child);
}
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
unsigned long tmp;
int ret;
switch (request) {
/* read the word at location addr in the USER area. */
case PTRACE_PEEKUSR: {
tmp = 0;
ret = -EIO;
if ((addr & 3) || addr < 0)
break;
ret = 0;
switch (addr >> 2) {
case 0 ... PT__END - 1:
tmp = get_reg(child, addr >> 2);
break;
case PT__END + 0:
tmp = child->mm->end_code - child->mm->start_code;
break;
case PT__END + 1:
tmp = child->mm->end_data - child->mm->start_data;
break;
case PT__END + 2:
tmp = child->mm->start_stack - child->mm->start_brk;
break;
case PT__END + 3:
tmp = child->mm->start_code;
break;
case PT__END + 4:
tmp = child->mm->start_stack;
break;
default:
ret = -EIO;
break;
}
if (ret == 0)
ret = put_user(tmp, (unsigned long *) data);
break;
}
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
ret = -EIO;
if ((addr & 3) || addr < 0)
break;
ret = 0;
switch (addr >> 2) {
case 0 ... PT__END - 1:
ret = put_reg(child, addr >> 2, data);
break;
default:
ret = -EIO;
break;
}
break;
case PTRACE_GETREGS: /* Get all integer regs from the child. */
return copy_regset_to_user(child, &user_frv_native_view,
REGSET_GENERAL,
0, sizeof(child->thread.user->i),
(void __user *)data);
case PTRACE_SETREGS: /* Set all integer regs in the child. */
return copy_regset_from_user(child, &user_frv_native_view,
REGSET_GENERAL,
0, sizeof(child->thread.user->i),
(const void __user *)data);
case PTRACE_GETFPREGS: /* Get the child FP/Media state. */
return copy_regset_to_user(child, &user_frv_native_view,
REGSET_FPMEDIA,
0, sizeof(child->thread.user->f),
(void __user *)data);
case PTRACE_SETFPREGS: /* Set the child FP/Media state. */
return copy_regset_from_user(child, &user_frv_native_view,
REGSET_FPMEDIA,
0, sizeof(child->thread.user->f),
(const void __user *)data);
case PTRACE_GETFDPIC:
tmp = 0;
switch (addr) {
case PTRACE_GETFDPIC_EXEC:
tmp = child->mm->context.exec_fdpic_loadmap;
break;
case PTRACE_GETFDPIC_INTERP:
tmp = child->mm->context.interp_fdpic_loadmap;
break;
default:
break;
}
ret = 0;
if (put_user(tmp, (unsigned long *) data)) {
ret = -EFAULT;
break;
}
break;
default:
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}
/*
* handle tracing of system call entry
* - return the revised system call number or ULONG_MAX to cause ENOSYS
*/
asmlinkage unsigned long syscall_trace_entry(void)
{
__frame->__status |= REG__STATUS_SYSC_ENTRY;
if (tracehook_report_syscall_entry(__frame)) {
/* tracing decided this syscall should not happen, so
* We'll return a bogus call number to get an ENOSYS
* error, but leave the original number in
* __frame->syscallno
*/
return ULONG_MAX;
}
return __frame->syscallno;
}
/*
* handle tracing of system call exit
*/
asmlinkage void syscall_trace_exit(void)
{
__frame->__status |= REG__STATUS_SYSC_EXIT;
tracehook_report_syscall_exit(__frame, 0);
}
