2010-05-29 11:09:12 +08:00
|
|
|
/*
|
|
|
|
* Copyright 2010 Tilera Corporation. All Rights Reserved.
|
|
|
|
*
|
|
|
|
* 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, version 2.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful, but
|
|
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
|
|
* NON INFRINGEMENT. See the GNU General Public License for
|
|
|
|
* more details.
|
|
|
|
*
|
|
|
|
* Copied from i386: Ross Biro 1/23/92
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/ptrace.h>
|
|
|
|
#include <linux/kprobes.h>
|
|
|
|
#include <linux/compat.h>
|
|
|
|
#include <linux/uaccess.h>
|
2012-12-18 09:08:09 +08:00
|
|
|
#include <linux/regset.h>
|
|
|
|
#include <linux/elf.h>
|
2012-12-22 13:21:10 +08:00
|
|
|
#include <linux/tracehook.h>
|
2015-03-24 02:23:58 +08:00
|
|
|
#include <linux/context_tracking.h>
|
2010-06-26 05:04:17 +08:00
|
|
|
#include <asm/traps.h>
|
2012-12-18 09:08:09 +08:00
|
|
|
#include <arch/chip.h>
|
2010-05-29 11:09:12 +08:00
|
|
|
|
2013-01-22 08:54:57 +08:00
|
|
|
#define CREATE_TRACE_POINTS
|
|
|
|
#include <trace/events/syscalls.h>
|
|
|
|
|
2010-05-29 11:09:12 +08:00
|
|
|
void user_enable_single_step(struct task_struct *child)
|
|
|
|
{
|
|
|
|
set_tsk_thread_flag(child, TIF_SINGLESTEP);
|
|
|
|
}
|
|
|
|
|
|
|
|
void user_disable_single_step(struct task_struct *child)
|
|
|
|
{
|
|
|
|
clear_tsk_thread_flag(child, TIF_SINGLESTEP);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called by kernel/ptrace.c when detaching..
|
|
|
|
*/
|
|
|
|
void ptrace_disable(struct task_struct *child)
|
|
|
|
{
|
|
|
|
clear_tsk_thread_flag(child, TIF_SINGLESTEP);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* These two are currently unused, but will be set by arch_ptrace()
|
|
|
|
* and used in the syscall assembly when we do support them.
|
|
|
|
*/
|
|
|
|
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
|
|
|
|
}
|
|
|
|
|
2012-12-13 06:24:39 +08:00
|
|
|
/*
|
|
|
|
* Get registers from task and ready the result for userspace.
|
|
|
|
* Note that we localize the API issues to getregs() and putregs() at
|
|
|
|
* some cost in performance, e.g. we need a full pt_regs copy for
|
|
|
|
* PEEKUSR, and two copies for POKEUSR. But in general we expect
|
|
|
|
* GETREGS/PUTREGS to be the API of choice anyway.
|
|
|
|
*/
|
|
|
|
static char *getregs(struct task_struct *child, struct pt_regs *uregs)
|
|
|
|
{
|
|
|
|
*uregs = *task_pt_regs(child);
|
|
|
|
|
|
|
|
/* Set up flags ABI bits. */
|
|
|
|
uregs->flags = 0;
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
if (task_thread_info(child)->status & TS_COMPAT)
|
|
|
|
uregs->flags |= PT_FLAGS_COMPAT;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
return (char *)uregs;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Put registers back to task. */
|
|
|
|
static void putregs(struct task_struct *child, struct pt_regs *uregs)
|
|
|
|
{
|
|
|
|
struct pt_regs *regs = task_pt_regs(child);
|
|
|
|
|
|
|
|
/* Don't allow overwriting the kernel-internal flags word. */
|
|
|
|
uregs->flags = regs->flags;
|
|
|
|
|
|
|
|
/* Only allow setting the ICS bit in the ex1 word. */
|
|
|
|
uregs->ex1 = PL_ICS_EX1(USER_PL, EX1_ICS(uregs->ex1));
|
|
|
|
|
|
|
|
*regs = *uregs;
|
|
|
|
}
|
|
|
|
|
2012-12-18 09:08:09 +08:00
|
|
|
enum tile_regset {
|
|
|
|
REGSET_GPR,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int tile_gpr_get(struct task_struct *target,
|
|
|
|
const struct user_regset *regset,
|
|
|
|
unsigned int pos, unsigned int count,
|
|
|
|
void *kbuf, void __user *ubuf)
|
|
|
|
{
|
|
|
|
struct pt_regs regs;
|
|
|
|
|
|
|
|
getregs(target, ®s);
|
|
|
|
|
|
|
|
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, ®s, 0,
|
|
|
|
sizeof(regs));
|
|
|
|
}
|
|
|
|
|
|
|
|
static int tile_gpr_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;
|
|
|
|
struct pt_regs regs;
|
|
|
|
|
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®s, 0,
|
|
|
|
sizeof(regs));
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
putregs(target, ®s);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct user_regset tile_user_regset[] = {
|
|
|
|
[REGSET_GPR] = {
|
|
|
|
.core_note_type = NT_PRSTATUS,
|
|
|
|
.n = ELF_NGREG,
|
|
|
|
.size = sizeof(elf_greg_t),
|
|
|
|
.align = sizeof(elf_greg_t),
|
|
|
|
.get = tile_gpr_get,
|
|
|
|
.set = tile_gpr_set,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct user_regset_view tile_user_regset_view = {
|
|
|
|
.name = CHIP_ARCH_NAME,
|
|
|
|
.e_machine = ELF_ARCH,
|
|
|
|
.ei_osabi = ELF_OSABI,
|
|
|
|
.regsets = tile_user_regset,
|
|
|
|
.n = ARRAY_SIZE(tile_user_regset),
|
|
|
|
};
|
|
|
|
|
|
|
|
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
|
|
|
|
{
|
|
|
|
return &tile_user_regset_view;
|
|
|
|
}
|
|
|
|
|
2010-10-28 06:33:47 +08:00
|
|
|
long arch_ptrace(struct task_struct *child, long request,
|
|
|
|
unsigned long addr, unsigned long data)
|
2010-05-29 11:09:12 +08:00
|
|
|
{
|
2010-10-15 04:48:00 +08:00
|
|
|
unsigned long __user *datap = (long __user __force *)data;
|
2010-05-29 11:09:12 +08:00
|
|
|
unsigned long tmp;
|
|
|
|
long ret = -EIO;
|
2010-10-15 04:48:00 +08:00
|
|
|
char *childreg;
|
2010-10-29 03:47:06 +08:00
|
|
|
struct pt_regs copyregs;
|
2010-05-29 11:09:12 +08:00
|
|
|
|
|
|
|
switch (request) {
|
|
|
|
|
|
|
|
case PTRACE_PEEKUSR: /* Read register from pt_regs. */
|
2010-10-28 06:34:04 +08:00
|
|
|
if (addr >= PTREGS_SIZE)
|
2010-05-29 11:09:12 +08:00
|
|
|
break;
|
2012-12-13 06:24:39 +08:00
|
|
|
childreg = getregs(child, ©regs) + addr;
|
2010-10-15 04:48:00 +08:00
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
if (is_compat_task()) {
|
|
|
|
if (addr & (sizeof(compat_long_t)-1))
|
|
|
|
break;
|
|
|
|
ret = put_user(*(compat_long_t *)childreg,
|
|
|
|
(compat_long_t __user *)datap);
|
|
|
|
} else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
if (addr & (sizeof(long)-1))
|
|
|
|
break;
|
|
|
|
ret = put_user(*(long *)childreg, datap);
|
|
|
|
}
|
2010-05-29 11:09:12 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_POKEUSR: /* Write register in pt_regs. */
|
2010-10-28 06:34:04 +08:00
|
|
|
if (addr >= PTREGS_SIZE)
|
2010-05-29 11:09:12 +08:00
|
|
|
break;
|
2012-12-13 06:24:39 +08:00
|
|
|
childreg = getregs(child, ©regs) + addr;
|
2010-10-15 04:48:00 +08:00
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
if (is_compat_task()) {
|
|
|
|
if (addr & (sizeof(compat_long_t)-1))
|
|
|
|
break;
|
|
|
|
*(compat_long_t *)childreg = data;
|
|
|
|
} else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
if (addr & (sizeof(long)-1))
|
|
|
|
break;
|
|
|
|
*(long *)childreg = data;
|
|
|
|
}
|
2012-12-13 06:24:39 +08:00
|
|
|
putregs(child, ©regs);
|
2010-07-03 02:17:52 +08:00
|
|
|
ret = 0;
|
2010-05-29 11:09:12 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_GETREGS: /* Get all registers from the child. */
|
2012-12-18 09:08:10 +08:00
|
|
|
ret = copy_regset_to_user(child, &tile_user_regset_view,
|
|
|
|
REGSET_GPR, 0,
|
|
|
|
sizeof(struct pt_regs), datap);
|
2010-05-29 11:09:12 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_SETREGS: /* Set all registers in the child. */
|
2012-12-18 09:08:10 +08:00
|
|
|
ret = copy_regset_from_user(child, &tile_user_regset_view,
|
|
|
|
REGSET_GPR, 0,
|
|
|
|
sizeof(struct pt_regs), datap);
|
2010-05-29 11:09:12 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_GETFPREGS: /* Get the child FPU state. */
|
|
|
|
case PTRACE_SETFPREGS: /* Set the child FPU state. */
|
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_SETOPTIONS:
|
|
|
|
/* Support TILE-specific ptrace options. */
|
2012-12-14 00:34:45 +08:00
|
|
|
BUILD_BUG_ON(PTRACE_O_MASK_TILE & PTRACE_O_MASK);
|
2010-05-29 11:09:12 +08:00
|
|
|
tmp = data & PTRACE_O_MASK_TILE;
|
|
|
|
data &= ~PTRACE_O_MASK_TILE;
|
|
|
|
ret = ptrace_request(child, request, addr, data);
|
2012-12-14 00:34:45 +08:00
|
|
|
if (ret == 0) {
|
|
|
|
unsigned int flags = child->ptrace;
|
|
|
|
flags &= ~(PTRACE_O_MASK_TILE << PT_OPT_FLAG_SHIFT);
|
|
|
|
flags |= (tmp << PT_OPT_FLAG_SHIFT);
|
|
|
|
child->ptrace = flags;
|
|
|
|
}
|
2010-05-29 11:09:12 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
if (task_thread_info(current)->status & TS_COMPAT) {
|
|
|
|
ret = compat_ptrace_request(child, request,
|
|
|
|
addr, data);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
ret = ptrace_request(child, request, addr, data);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
/* Not used; we handle compat issues in arch_ptrace() directly. */
|
|
|
|
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
|
|
|
|
compat_ulong_t addr, compat_ulong_t data)
|
|
|
|
{
|
|
|
|
BUG();
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2012-12-22 13:21:10 +08:00
|
|
|
int do_syscall_trace_enter(struct pt_regs *regs)
|
2010-05-29 11:09:12 +08:00
|
|
|
{
|
2015-03-24 02:23:58 +08:00
|
|
|
u32 work = ACCESS_ONCE(current_thread_info()->flags);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If TIF_NOHZ is set, we are required to call user_exit() before
|
|
|
|
* doing anything that could touch RCU.
|
|
|
|
*/
|
|
|
|
if (work & _TIF_NOHZ)
|
|
|
|
user_exit();
|
|
|
|
|
2015-07-23 02:30:14 +08:00
|
|
|
if (secure_computing() == -1)
|
|
|
|
return -1;
|
|
|
|
|
2015-03-24 02:23:58 +08:00
|
|
|
if (work & _TIF_SYSCALL_TRACE) {
|
2013-01-22 08:54:57 +08:00
|
|
|
if (tracehook_report_syscall_entry(regs))
|
|
|
|
regs->regs[TREG_SYSCALL_NR] = -1;
|
2012-12-22 13:21:10 +08:00
|
|
|
}
|
2010-05-29 11:09:12 +08:00
|
|
|
|
2015-03-24 02:23:58 +08:00
|
|
|
if (work & _TIF_SYSCALL_TRACEPOINT)
|
2013-01-22 08:54:57 +08:00
|
|
|
trace_sys_enter(regs, regs->regs[TREG_SYSCALL_NR]);
|
|
|
|
|
2012-12-22 13:21:10 +08:00
|
|
|
return regs->regs[TREG_SYSCALL_NR];
|
|
|
|
}
|
2010-05-29 11:09:12 +08:00
|
|
|
|
2012-12-22 13:21:10 +08:00
|
|
|
void do_syscall_trace_exit(struct pt_regs *regs)
|
|
|
|
{
|
2013-08-10 03:42:56 +08:00
|
|
|
long errno;
|
|
|
|
|
2015-03-24 02:23:58 +08:00
|
|
|
/*
|
|
|
|
* We may come here right after calling schedule_user()
|
|
|
|
* in which case we can be in RCU user mode.
|
|
|
|
*/
|
|
|
|
user_exit();
|
|
|
|
|
2013-08-10 03:42:56 +08:00
|
|
|
/*
|
|
|
|
* The standard tile calling convention returns the value (or negative
|
|
|
|
* errno) in r0, and zero (or positive errno) in r1.
|
|
|
|
* It saves a couple of cycles on the hot path to do this work in
|
|
|
|
* registers only as we return, rather than updating the in-memory
|
|
|
|
* struct ptregs.
|
|
|
|
*/
|
|
|
|
errno = (long) regs->regs[0];
|
|
|
|
if (errno < 0 && errno > -4096)
|
|
|
|
regs->regs[1] = -errno;
|
|
|
|
else
|
|
|
|
regs->regs[1] = 0;
|
|
|
|
|
2013-01-22 08:54:57 +08:00
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE))
|
|
|
|
tracehook_report_syscall_exit(regs, 0);
|
|
|
|
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
|
2013-04-17 23:01:22 +08:00
|
|
|
trace_sys_exit(regs, regs->regs[0]);
|
2010-05-29 11:09:12 +08:00
|
|
|
}
|
|
|
|
|
2013-08-07 04:04:13 +08:00
|
|
|
void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs)
|
2010-05-29 11:09:12 +08:00
|
|
|
{
|
|
|
|
struct siginfo info;
|
|
|
|
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
|
|
info.si_signo = SIGTRAP;
|
|
|
|
info.si_code = TRAP_BRKPT;
|
|
|
|
info.si_addr = (void __user *) regs->pc;
|
|
|
|
|
|
|
|
/* Send us the fakey SIGTRAP */
|
|
|
|
force_sig_info(SIGTRAP, &info, tsk);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Handle synthetic interrupt delivered only by the simulator. */
|
|
|
|
void __kprobes do_breakpoint(struct pt_regs* regs, int fault_num)
|
|
|
|
{
|
2015-03-24 02:23:58 +08:00
|
|
|
enum ctx_state prev_state = exception_enter();
|
2013-08-07 04:04:13 +08:00
|
|
|
send_sigtrap(current, regs);
|
2015-03-24 02:23:58 +08:00
|
|
|
exception_exit(prev_state);
|
2010-05-29 11:09:12 +08:00
|
|
|
}
|