/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/regset.h>
#include <linux/unistd.h>
#include <linux/elf.h>
static struct callee_regs *task_callee_regs(struct task_struct *tsk)
{
struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg;
return tmp;
}
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 *ptregs = task_pt_regs(target);
const struct callee_regs *cregs = task_callee_regs(target);
int ret = 0;
unsigned int stop_pc_val;
#define REG_O_CHUNK(START, END, PTR) \
if (!ret) \
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
offsetof(struct user_regs_struct, START), \
offsetof(struct user_regs_struct, END));
#define REG_O_ONE(LOC, PTR) \
if (!ret) \
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
offsetof(struct user_regs_struct, LOC), \
offsetof(struct user_regs_struct, LOC) + 4);
REG_O_CHUNK(scratch, callee, ptregs);
REG_O_CHUNK(callee, efa, cregs);
REG_O_CHUNK(efa, stop_pc, &target->thread.fault_address);
if (!ret) {
if (in_brkpt_trap(ptregs)) {
stop_pc_val = target->thread.fault_address;
pr_debug("\t\tstop_pc (brk-pt)\n");
} else {
stop_pc_val = ptregs->ret;
pr_debug("\t\tstop_pc (others)\n");
}
REG_O_ONE(stop_pc, &stop_pc_val);
}
return ret;
}
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)
{
const struct pt_regs *ptregs = task_pt_regs(target);
const struct callee_regs *cregs = task_callee_regs(target);
int ret = 0;
#define REG_IN_CHUNK(FIRST, NEXT, PTR) \
if (!ret) \
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
(void *)(PTR), \
offsetof(struct user_regs_struct, FIRST), \
offsetof(struct user_regs_struct, NEXT));
#define REG_IN_ONE(LOC, PTR) \
if (!ret) \
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
(void *)(PTR), \
offsetof(struct user_regs_struct, LOC), \
offsetof(struct user_regs_struct, LOC) + 4);
#define REG_IGNORE_ONE(LOC) \
if (!ret) \
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
offsetof(struct user_regs_struct, LOC), \
offsetof(struct user_regs_struct, LOC) + 4);
/* TBD: disallow updates to STATUS32, orig_r8 etc*/
REG_IN_CHUNK(scratch, callee, ptregs); /* pt_regs[bta..orig_r8] */
REG_IN_CHUNK(callee, efa, cregs); /* callee_regs[r25..r13] */
REG_IGNORE_ONE(efa); /* efa update invalid */
REG_IN_ONE(stop_pc, &ptregs->ret); /* stop_pc: PC update */
return ret;
}
enum arc_getset {
REGSET_GENERAL,
};
static const struct user_regset arc_regsets[] = {
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(unsigned long),
.align = sizeof(unsigned long),
.get = genregs_get,
.set = genregs_set,
}
};
static const struct user_regset_view user_arc_view = {
.name = UTS_MACHINE,
.e_machine = EM_ARCOMPACT,
.regsets = arc_regsets,
.n = ARRAY_SIZE(arc_regsets)
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_arc_view;
}
void ptrace_disable(struct task_struct *child)
{
}
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
int ret = -EIO;
pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);
switch (request) {
default:
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}
asmlinkage int syscall_trace_entry(struct pt_regs *regs)
{
if (tracehook_report_syscall_entry(regs))
return ULONG_MAX;
return regs->r8;
}
asmlinkage void syscall_trace_exit(struct pt_regs *regs)
{
tracehook_report_syscall_exit(regs, 0);
}
