/* MN10300 Process tracing
*
* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Modified by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, 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/regset.h>
#include <linux/elf.h>
#include <linux/tracehook.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/fpu.h>
#include <asm/asm-offsets.h>
/*
* translate ptrace register IDs into struct pt_regs offsets
*/
static const u8 ptrace_regid_to_frame[] = {
[PT_A3 << 2] = REG_A3,
[PT_A2 << 2] = REG_A2,
[PT_D3 << 2] = REG_D3,
[PT_D2 << 2] = REG_D2,
[PT_MCVF << 2] = REG_MCVF,
[PT_MCRL << 2] = REG_MCRL,
[PT_MCRH << 2] = REG_MCRH,
[PT_MDRQ << 2] = REG_MDRQ,
[PT_E1 << 2] = REG_E1,
[PT_E0 << 2] = REG_E0,
[PT_E7 << 2] = REG_E7,
[PT_E6 << 2] = REG_E6,
[PT_E5 << 2] = REG_E5,
[PT_E4 << 2] = REG_E4,
[PT_E3 << 2] = REG_E3,
[PT_E2 << 2] = REG_E2,
[PT_SP << 2] = REG_SP,
[PT_LAR << 2] = REG_LAR,
[PT_LIR << 2] = REG_LIR,
[PT_MDR << 2] = REG_MDR,
[PT_A1 << 2] = REG_A1,
[PT_A0 << 2] = REG_A0,
[PT_D1 << 2] = REG_D1,
[PT_D0 << 2] = REG_D0,
[PT_ORIG_D0 << 2] = REG_ORIG_D0,
[PT_EPSW << 2] = REG_EPSW,
[PT_PC << 2] = REG_PC,
};
static inline int get_stack_long(struct task_struct *task, int offset)
{
return *(unsigned long *)
((unsigned long) task->thread.uregs + offset);
}
static inline
int put_stack_long(struct task_struct *task, int offset, unsigned long data)
{
unsigned long stack;
stack = (unsigned long) task->thread.uregs + offset;
*(unsigned long *) stack = data;
return 0;
}
/*
* retrieve the contents of MN10300 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 pt_regs *regs = task_pt_regs(target);
int ret;
/* we need to skip regs->next */
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
regs, 0, PT_ORIG_D0 * sizeof(long));
if (ret < 0)
return ret;
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
®s->orig_d0, PT_ORIG_D0 * sizeof(long),
NR_PTREGS * sizeof(long));
if (ret < 0)
return ret;
return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
NR_PTREGS * sizeof(long), -1);
}
/*
* update the contents of the MN10300 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 pt_regs *regs = task_pt_regs(target);
unsigned long tmp;
int ret;
/* we need to skip regs->next */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
regs, 0, PT_ORIG_D0 * sizeof(long));
if (ret < 0)
return ret;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
®s->orig_d0, PT_ORIG_D0 * sizeof(long),
PT_EPSW * sizeof(long));
if (ret < 0)
return ret;
/* we need to mask off changes to EPSW */
tmp = regs->epsw;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&tmp, PT_EPSW * sizeof(long),
PT_PC * sizeof(long));
tmp &= EPSW_FLAG_V | EPSW_FLAG_C | EPSW_FLAG_N | EPSW_FLAG_Z;
tmp |= regs->epsw & ~(EPSW_FLAG_V | EPSW_FLAG_C | EPSW_FLAG_N |
EPSW_FLAG_Z);
regs->epsw = tmp;
if (ret < 0)
return ret;
/* and finally load the PC */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
®s->pc, PT_PC * sizeof(long),
NR_PTREGS * sizeof(long));
if (ret < 0)
return ret;
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
NR_PTREGS * sizeof(long), -1);
}
/*
* retrieve the contents of MN10300 userspace FPU registers
*/
static int fpuregs_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
const struct fpu_state_struct *fpregs = &target->thread.fpu_state;
int ret;
unlazy_fpu(target);
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 MN10300 userspace FPU registers
*/
static int fpuregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct fpu_state_struct fpu_state = target->thread.fpu_state;
int ret;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&fpu_state, 0, sizeof(fpu_state));
if (ret < 0)
return ret;
fpu_kill_state(target);
target->thread.fpu_state = fpu_state;
set_using_fpu(target);
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
sizeof(fpu_state), -1);
}
/*
* determine if the FPU registers have actually been used
*/
static int fpuregs_active(struct task_struct *target,
const struct user_regset *regset)
{
return is_using_fpu(target) ? regset->n : 0;
}
/*
* Define the register sets available on the MN10300 under Linux
*/
enum mn10300_regset {
REGSET_GENERAL,
REGSET_FPU,
};
static const struct user_regset mn10300_regsets[] = {
/*
* General register format is:
* A3, A2, D3, D2, MCVF, MCRL, MCRH, MDRQ
* E1, E0, E7...E2, SP, LAR, LIR, MDR
* A1, A0, D1, D0, ORIG_D0, EPSW, PC
*/
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(long),
.align = sizeof(long),
.get = genregs_get,
.set = genregs_set,
},
/*
* FPU register format is:
* FS0-31, FPCR
*/
[REGSET_FPU] = {
.core_note_type = NT_PRFPREG,
.n = sizeof(struct fpu_state_struct) / sizeof(long),
.size = sizeof(long),
.align = sizeof(long),
.get = fpuregs_get,
.set = fpuregs_set,
.active = fpuregs_active,
},
};
static const struct user_regset_view user_mn10300_native_view = {
.name = "mn10300",
.e_machine = EM_MN10300,
.regsets = mn10300_regsets,
.n = ARRAY_SIZE(mn10300_regsets),
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_mn10300_native_view;
}
/*
* set the single-step bit
*/
void user_enable_single_step(struct task_struct *child)
{
#ifndef CONFIG_MN10300_USING_JTAG
struct user *dummy = NULL;
long tmp;
tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
tmp |= EPSW_T;
put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
#endif
}
/*
* make sure the single-step bit is not set
*/
void user_disable_single_step(struct task_struct *child)
{
#ifndef CONFIG_MN10300_USING_JTAG
struct user *dummy = NULL;
long tmp;
tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
tmp &= ~EPSW_T;
put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
#endif
}
void ptrace_disable(struct task_struct *child)
{
user_disable_single_step(child);
}
/*
* handle the arch-specific side of process tracing
*/
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
unsigned long tmp;
int ret;
unsigned long __user *datap = (unsigned long __user *) data;
switch (request) {
/* read the word at location addr in the USER area. */
case PTRACE_PEEKUSR:
ret = -EIO;
if ((addr & 3) || addr > sizeof(struct user) - 3)
break;
tmp = 0; /* Default return condition */
if (addr < NR_PTREGS << 2)
tmp = get_stack_long(child,
ptrace_regid_to_frame[addr]);
ret = put_user(tmp, datap);
break;
/* write the word at location addr in the USER area */
case PTRACE_POKEUSR:
ret = -EIO;
if ((addr & 3) || addr > sizeof(struct user) - 3)
break;
ret = 0;
if (addr < NR_PTREGS << 2)
ret = put_stack_long(child, ptrace_regid_to_frame[addr],
data);
break;
case PTRACE_GETREGS: /* Get all integer regs from the child. */
return copy_regset_to_user(child, &user_mn10300_native_view,
REGSET_GENERAL,
0, NR_PTREGS * sizeof(long),
datap);
case PTRACE_SETREGS: /* Set all integer regs in the child. */
return copy_regset_from_user(child, &user_mn10300_native_view,
REGSET_GENERAL,
0, NR_PTREGS * sizeof(long),
datap);
case PTRACE_GETFPREGS: /* Get the child FPU state. */
return copy_regset_to_user(child, &user_mn10300_native_view,
REGSET_FPU,
0, sizeof(struct fpu_state_struct),
datap);
case PTRACE_SETFPREGS: /* Set the child FPU state. */
return copy_regset_from_user(child, &user_mn10300_native_view,
REGSET_FPU,
0, sizeof(struct fpu_state_struct),
datap);
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(struct pt_regs *regs)
{
if (tracehook_report_syscall_entry(regs))
/* 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
* regs->orig_d0
*/
return ULONG_MAX;
return regs->orig_d0;
}
/*
* handle tracing of system call exit
*/
asmlinkage void syscall_trace_exit(struct pt_regs *regs)
{
tracehook_report_syscall_exit(regs, 0);
}