- 根目录:
- arch
- metag
- kernel
- ptrace.c
/*
* Copyright (C) 2005-2012 Imagination Technologies Ltd.
*
* 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/kernel.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/regset.h>
#include <linux/tracehook.h>
#include <linux/elf.h>
#include <linux/uaccess.h>
#include <trace/syscall.h>
#define CREATE_TRACE_POINTS
#include <trace/events/syscalls.h>
/*
* user_regset definitions.
*/
int metag_gp_regs_copyout(const struct pt_regs *regs,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
const void *ptr;
unsigned long data;
int ret;
/* D{0-1}.{0-7} */
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
regs->ctx.DX, 0, 4*16);
if (ret)
goto out;
/* A{0-1}.{0-1} */
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
regs->ctx.AX, 4*16, 4*20);
if (ret)
goto out;
/* A{0-1}.2 */
if (regs->ctx.SaveMask & TBICTX_XEXT_BIT)
ptr = regs->ctx.Ext.Ctx.pExt;
else
ptr = ®s->ctx.Ext.AX2;
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
ptr, 4*20, 4*22);
if (ret)
goto out;
/* A{0-1}.3 */
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
®s->ctx.AX3, 4*22, 4*24);
if (ret)
goto out;
/* PC */
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
®s->ctx.CurrPC, 4*24, 4*25);
if (ret)
goto out;
/* TXSTATUS */
data = (unsigned long)regs->ctx.Flags;
if (regs->ctx.SaveMask & TBICTX_CBUF_BIT)
data |= USER_GP_REGS_STATUS_CATCH_BIT;
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&data, 4*25, 4*26);
if (ret)
goto out;
/* TXRPT, TXBPOBITS, TXMODE */
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
®s->ctx.CurrRPT, 4*26, 4*29);
if (ret)
goto out;
/* Padding */
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
4*29, 4*30);
out:
return ret;
}
int metag_gp_regs_copyin(struct pt_regs *regs,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
void *ptr;
unsigned long data;
int ret;
/* D{0-1}.{0-7} */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
regs->ctx.DX, 0, 4*16);
if (ret)
goto out;
/* A{0-1}.{0-1} */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
regs->ctx.AX, 4*16, 4*20);
if (ret)
goto out;
/* A{0-1}.2 */
if (regs->ctx.SaveMask & TBICTX_XEXT_BIT)
ptr = regs->ctx.Ext.Ctx.pExt;
else
ptr = ®s->ctx.Ext.AX2;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
ptr, 4*20, 4*22);
if (ret)
goto out;
/* A{0-1}.3 */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
®s->ctx.AX3, 4*22, 4*24);
if (ret)
goto out;
/* PC */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
®s->ctx.CurrPC, 4*24, 4*25);
if (ret)
goto out;
/* TXSTATUS */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&data, 4*25, 4*26);
if (ret)
goto out;
regs->ctx.Flags = data & 0xffff;
if (data & USER_GP_REGS_STATUS_CATCH_BIT)
regs->ctx.SaveMask |= TBICTX_XCBF_BIT | TBICTX_CBUF_BIT;
else
regs->ctx.SaveMask &= ~TBICTX_CBUF_BIT;
/* TXRPT, TXBPOBITS, TXMODE */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
®s->ctx.CurrRPT, 4*26, 4*29);
out:
return ret;
}
static int metag_gp_regs_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);
return metag_gp_regs_copyout(regs, pos, count, kbuf, ubuf);
}
static int metag_gp_regs_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);
return metag_gp_regs_copyin(regs, pos, count, kbuf, ubuf);
}
int metag_cb_regs_copyout(const struct pt_regs *regs,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
int ret;
/* TXCATCH{0-3} */
if (regs->ctx.SaveMask & TBICTX_XCBF_BIT)
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
regs->extcb0, 0, 4*4);
else
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
0, 4*4);
return ret;
}
int metag_cb_regs_copyin(struct pt_regs *regs,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
int ret;
/* TXCATCH{0-3} */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
regs->extcb0, 0, 4*4);
return ret;
}
static int metag_cb_regs_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);
return metag_cb_regs_copyout(regs, pos, count, kbuf, ubuf);
}
static int metag_cb_regs_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);
return metag_cb_regs_copyin(regs, pos, count, kbuf, ubuf);
}
int metag_rp_state_copyout(const struct pt_regs *regs,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
unsigned long mask;
u64 *ptr;
int ret, i;
/* Empty read pipeline */
if (!(regs->ctx.SaveMask & TBICTX_CBRP_BIT)) {
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
0, 4*13);
goto out;
}
mask = (regs->ctx.CurrDIVTIME & TXDIVTIME_RPMASK_BITS) >>
TXDIVTIME_RPMASK_S;
/* Read pipeline entries */
ptr = (void *)®s->extcb0[1];
for (i = 0; i < 6; ++i, ++ptr) {
if (mask & (1 << i))
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
ptr, 8*i, 8*(i + 1));
else
ret = user_regset_copyout_zero(&pos, &count, &kbuf,
&ubuf, 8*i, 8*(i + 1));
if (ret)
goto out;
}
/* Mask of entries */
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&mask, 4*12, 4*13);
out:
return ret;
}
int metag_rp_state_copyin(struct pt_regs *regs,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct user_rp_state rp;
unsigned long long *ptr;
int ret, i;
/* Read the entire pipeline before making any changes */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&rp, 0, 4*13);
if (ret)
goto out;
/* Write pipeline entries */
ptr = (void *)®s->extcb0[1];
for (i = 0; i < 6; ++i, ++ptr)
if (rp.mask & (1 << i))
*ptr = rp.entries[i];
/* Update RPMask in TXDIVTIME */
regs->ctx.CurrDIVTIME &= ~TXDIVTIME_RPMASK_BITS;
regs->ctx.CurrDIVTIME |= (rp.mask << TXDIVTIME_RPMASK_S)
& TXDIVTIME_RPMASK_BITS;
/* Set/clear flags to indicate catch/read pipeline state */
if (rp.mask)
regs->ctx.SaveMask |= TBICTX_XCBF_BIT | TBICTX_CBRP_BIT;
else
regs->ctx.SaveMask &= ~TBICTX_CBRP_BIT;
out:
return ret;
}
static int metag_rp_state_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);
return metag_rp_state_copyout(regs, pos, count, kbuf, ubuf);
}
static int metag_rp_state_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);
return metag_rp_state_copyin(regs, pos, count, kbuf, ubuf);
}
static int metag_tls_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
void __user *tls = target->thread.tls_ptr;
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
}
static int metag_tls_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
int ret;
void __user *tls;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
if (ret)
return ret;
target->thread.tls_ptr = tls;
return ret;
}
enum metag_regset {
REGSET_GENERAL,
REGSET_CBUF,
REGSET_READPIPE,
REGSET_TLS,
};
static const struct user_regset metag_regsets[] = {
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(long),
.align = sizeof(long long),
.get = metag_gp_regs_get,
.set = metag_gp_regs_set,
},
[REGSET_CBUF] = {
.core_note_type = NT_METAG_CBUF,
.n = sizeof(struct user_cb_regs) / sizeof(long),
.size = sizeof(long),
.align = sizeof(long long),
.get = metag_cb_regs_get,
.set = metag_cb_regs_set,
},
[REGSET_READPIPE] = {
.core_note_type = NT_METAG_RPIPE,
.n = sizeof(struct user_rp_state) / sizeof(long),
.size = sizeof(long),
.align = sizeof(long long),
.get = metag_rp_state_get,
.set = metag_rp_state_set,
},
[REGSET_TLS] = {
.core_note_type = NT_METAG_TLS,
.n = 1,
.size = sizeof(void *),
.align = sizeof(void *),
.get = metag_tls_get,
.set = metag_tls_set,
},
};
static const struct user_regset_view user_metag_view = {
.name = "metag",
.e_machine = EM_METAG,
.regsets = metag_regsets,
.n = ARRAY_SIZE(metag_regsets)
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_metag_view;
}
/*
* Called by kernel/ptrace.c when detaching..
*
* Make sure single step bits etc are not set.
*/
void ptrace_disable(struct task_struct *child)
{
/* nothing to do.. */
}
long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
unsigned long data)
{
int ret;
switch (request) {
default:
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}
int syscall_trace_enter(struct pt_regs *regs)
{
int ret = 0;
if (test_thread_flag(TIF_SYSCALL_TRACE))
ret = tracehook_report_syscall_entry(regs);
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_enter(regs, regs->ctx.DX[0].U1);
return ret ? -1 : regs->ctx.DX[0].U1;
}
void syscall_trace_leave(struct pt_regs *regs)
{
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_exit(regs, regs->ctx.DX[0].U1);
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(regs, 0);
}