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nios2: ptrace support
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Add ptrace support for nios2.

Signed-off-by: Ley Foon Tan <lftan@altera.com>
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Ley Foon Tan committed Dec 8, 2014
1 parent 42381bf commit 106174d
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33 changes: 33 additions & 0 deletions arch/nios2/include/asm/ptrace.h
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/*
* Copyright (C) 2013 Altera Corporation
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
* Copyright (C) 2004 Microtronix Datacom Ltd
*
* based on m68k asm/processor.h
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/

#ifndef _ASM_NIOS2_PTRACE_H
#define _ASM_NIOS2_PTRACE_H

#include <uapi/asm/ptrace.h>

#ifndef __ASSEMBLY__
#define user_mode(regs) (((regs)->estatus & ESTATUS_EU))

#define instruction_pointer(regs) ((regs)->ra)
#define profile_pc(regs) instruction_pointer(regs)
#define user_stack_pointer(regs) ((regs)->sp)
extern void show_regs(struct pt_regs *);

#define current_pt_regs() \
((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE)\
- 1)

int do_syscall_trace_enter(void);
void do_syscall_trace_exit(void);
#endif /* __ASSEMBLY__ */
#endif /* _ASM_NIOS2_PTRACE_H */
120 changes: 120 additions & 0 deletions arch/nios2/include/uapi/asm/ptrace.h
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/*
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
* Copyright (C) 2004 Microtronix Datacom Ltd
*
* based on m68k asm/processor.h
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/

#ifndef _UAPI_ASM_NIOS2_PTRACE_H
#define _UAPI_ASM_NIOS2_PTRACE_H

#ifndef __ASSEMBLY__

/*
* Register numbers used by 'ptrace' system call interface.
*/

/* GP registers */
#define PTR_R0 0
#define PTR_R1 1
#define PTR_R2 2
#define PTR_R3 3
#define PTR_R4 4
#define PTR_R5 5
#define PTR_R6 6
#define PTR_R7 7
#define PTR_R8 8
#define PTR_R9 9
#define PTR_R10 10
#define PTR_R11 11
#define PTR_R12 12
#define PTR_R13 13
#define PTR_R14 14
#define PTR_R15 15
#define PTR_R16 16
#define PTR_R17 17
#define PTR_R18 18
#define PTR_R19 19
#define PTR_R20 20
#define PTR_R21 21
#define PTR_R22 22
#define PTR_R23 23
#define PTR_R24 24
#define PTR_R25 25
#define PTR_GP 26
#define PTR_SP 27
#define PTR_FP 28
#define PTR_EA 29
#define PTR_BA 30
#define PTR_RA 31
/* Control registers */
#define PTR_PC 32
#define PTR_STATUS 33
#define PTR_ESTATUS 34
#define PTR_BSTATUS 35
#define PTR_IENABLE 36
#define PTR_IPENDING 37
#define PTR_CPUID 38
#define PTR_CTL6 39
#define PTR_CTL7 40
#define PTR_PTEADDR 41
#define PTR_TLBACC 42
#define PTR_TLBMISC 43

#define NUM_PTRACE_REG (PTR_TLBMISC + 1)

/* this struct defines the way the registers are stored on the
stack during a system call.
There is a fake_regs in setup.c that has to match pt_regs.*/

struct pt_regs {
unsigned long r8; /* r8-r15 Caller-saved GP registers */
unsigned long r9;
unsigned long r10;
unsigned long r11;
unsigned long r12;
unsigned long r13;
unsigned long r14;
unsigned long r15;
unsigned long r1; /* Assembler temporary */
unsigned long r2; /* Retval LS 32bits */
unsigned long r3; /* Retval MS 32bits */
unsigned long r4; /* r4-r7 Register arguments */
unsigned long r5;
unsigned long r6;
unsigned long r7;
unsigned long orig_r2; /* Copy of r2 ?? */
unsigned long ra; /* Return address */
unsigned long fp; /* Frame pointer */
unsigned long sp; /* Stack pointer */
unsigned long gp; /* Global pointer */
unsigned long estatus;
unsigned long ea; /* Exception return address (pc) */
unsigned long orig_r7;
};

/*
* This is the extended stack used by signal handlers and the context
* switcher: it's pushed after the normal "struct pt_regs".
*/
struct switch_stack {
unsigned long r16; /* r16-r23 Callee-saved GP registers */
unsigned long r17;
unsigned long r18;
unsigned long r19;
unsigned long r20;
unsigned long r21;
unsigned long r22;
unsigned long r23;
unsigned long fp;
unsigned long gp;
unsigned long ra;
};

#endif /* __ASSEMBLY__ */
#endif /* _UAPI_ASM_NIOS2_PTRACE_H */
166 changes: 166 additions & 0 deletions arch/nios2/kernel/ptrace.c
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/*
* Copyright (C) 2014 Altera Corporation
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*/

#include <linux/elf.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/ptrace.h>
#include <linux/regset.h>
#include <linux/sched.h>
#include <linux/tracehook.h>
#include <linux/uaccess.h>
#include <linux/user.h>

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);
const struct switch_stack *sw = (struct switch_stack *)regs - 1;
int ret = 0;

#define REG_O_ZERO_RANGE(START, END) \
if (!ret) \
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \
START * 4, (END * 4) + 4);

#define REG_O_ONE(PTR, LOC) \
if (!ret) \
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
LOC * 4, (LOC * 4) + 4);

#define REG_O_RANGE(PTR, START, END) \
if (!ret) \
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
START * 4, (END * 4) + 4);

REG_O_ZERO_RANGE(PTR_R0, PTR_R0);
REG_O_RANGE(&regs->r1, PTR_R1, PTR_R7);
REG_O_RANGE(&regs->r8, PTR_R8, PTR_R15);
REG_O_RANGE(sw, PTR_R16, PTR_R23);
REG_O_ZERO_RANGE(PTR_R24, PTR_R25); /* et and bt */
REG_O_ONE(&regs->gp, PTR_GP);
REG_O_ONE(&regs->sp, PTR_SP);
REG_O_ONE(&regs->fp, PTR_FP);
REG_O_ONE(&regs->ea, PTR_EA);
REG_O_ZERO_RANGE(PTR_BA, PTR_BA);
REG_O_ONE(&regs->ra, PTR_RA);
REG_O_ONE(&regs->ea, PTR_PC); /* use ea for PC */
if (!ret)
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
PTR_STATUS * 4, -1);

return ret;
}

/*
* Set the thread state from a regset passed in via ptrace
*/
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);
const struct switch_stack *sw = (struct switch_stack *)regs - 1;
int ret = 0;

#define REG_IGNORE_RANGE(START, END) \
if (!ret) \
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
START * 4, (END * 4) + 4);

#define REG_IN_ONE(PTR, LOC) \
if (!ret) \
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
(void *)(PTR), LOC * 4, (LOC * 4) + 4);

#define REG_IN_RANGE(PTR, START, END) \
if (!ret) \
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
(void *)(PTR), START * 4, (END * 4) + 4);

REG_IGNORE_RANGE(PTR_R0, PTR_R0);
REG_IN_RANGE(&regs->r1, PTR_R1, PTR_R7);
REG_IN_RANGE(&regs->r8, PTR_R8, PTR_R15);
REG_IN_RANGE(sw, PTR_R16, PTR_R23);
REG_IGNORE_RANGE(PTR_R24, PTR_R25); /* et and bt */
REG_IN_ONE(&regs->gp, PTR_GP);
REG_IN_ONE(&regs->sp, PTR_SP);
REG_IN_ONE(&regs->fp, PTR_FP);
REG_IN_ONE(&regs->ea, PTR_EA);
REG_IGNORE_RANGE(PTR_BA, PTR_BA);
REG_IN_ONE(&regs->ra, PTR_RA);
REG_IN_ONE(&regs->ea, PTR_PC); /* use ea for PC */
if (!ret)
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
PTR_STATUS * 4, -1);

return ret;
}

/*
* Define the register sets available on Nios2 under Linux
*/
enum nios2_regset {
REGSET_GENERAL,
};

static const struct user_regset nios2_regsets[] = {
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = NUM_PTRACE_REG,
.size = sizeof(unsigned long),
.align = sizeof(unsigned long),
.get = genregs_get,
.set = genregs_set,
}
};

static const struct user_regset_view nios2_user_view = {
.name = "nios2",
.e_machine = ELF_ARCH,
.ei_osabi = ELF_OSABI,
.regsets = nios2_regsets,
.n = ARRAY_SIZE(nios2_regsets)
};

const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &nios2_user_view;
}

void ptrace_disable(struct task_struct *child)
{

}

long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
unsigned long data)
{
return ptrace_request(child, request, addr, data);
}

asmlinkage int do_syscall_trace_enter(void)
{
int ret = 0;

if (test_thread_flag(TIF_SYSCALL_TRACE))
ret = tracehook_report_syscall_entry(task_pt_regs(current));

return ret;
}

asmlinkage void do_syscall_trace_exit(void)
{
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(task_pt_regs(current), 0);
}

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