2005-04-17 02:20:36 +04:00
/*
2007-11-28 13:58:11 +03:00
* arch / sh / kernel / ptrace_64 . c
2005-04-17 02:20:36 +04:00
*
* Copyright ( C ) 2000 , 2001 Paolo Alberelli
2008-12-10 14:14:15 +03:00
* Copyright ( C ) 2003 - 2008 Paul Mundt
2005-04-17 02:20:36 +04:00
*
* Started from SH3 / 4 version :
* SuperH version : Copyright ( C ) 1999 , 2000 Kaz Kojima & Niibe Yutaka
*
* Original x86 implementation :
* By Ross Biro 1 / 23 / 92
* edited by Linus Torvalds
*
2007-11-28 13:58:11 +03:00
* 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 .
2005-04-17 02:20:36 +04:00
*/
# include <linux/kernel.h>
# include <linux/rwsem.h>
# include <linux/sched.h>
# include <linux/mm.h>
# include <linux/smp.h>
# include <linux/smp_lock.h>
# include <linux/errno.h>
# include <linux/ptrace.h>
# include <linux/user.h>
2005-05-01 19:59:14 +04:00
# include <linux/signal.h>
2005-11-07 11:59:47 +03:00
# include <linux/syscalls.h>
2007-11-28 13:58:11 +03:00
# include <linux/audit.h>
2008-07-30 10:30:52 +04:00
# include <linux/seccomp.h>
2008-07-30 14:55:30 +04:00
# include <linux/tracehook.h>
2008-12-10 14:14:15 +03:00
# include <linux/elf.h>
# include <linux/regset.h>
2005-04-17 02:20:36 +04:00
# include <asm/io.h>
# include <asm/uaccess.h>
# include <asm/pgtable.h>
# include <asm/system.h>
# include <asm/processor.h>
# include <asm/mmu_context.h>
2008-09-04 13:53:58 +04:00
# include <asm/syscalls.h>
2008-04-13 22:15:38 +04:00
# include <asm/fpu.h>
2005-04-17 02:20:36 +04:00
/* This mask defines the bits of the SR which the user is not allowed to
change , which are everything except S , Q , M , PR , SZ , FR . */
# define SR_MASK (0xffff8cfd)
/*
* does not yet catch signals sent when the child dies .
* in exit . c or in signal . c .
*/
/*
* This routine will get a word from the user area in the process kernel stack .
*/
static inline int get_stack_long ( struct task_struct * task , int offset )
{
unsigned char * stack ;
stack = ( unsigned char * ) ( task - > thread . uregs ) ;
stack + = offset ;
return ( * ( ( int * ) stack ) ) ;
}
static inline unsigned long
get_fpu_long ( struct task_struct * task , unsigned long addr )
{
unsigned long tmp ;
struct pt_regs * regs ;
regs = ( struct pt_regs * ) ( ( unsigned char * ) task + THREAD_SIZE ) - 1 ;
if ( ! tsk_used_math ( task ) ) {
if ( addr = = offsetof ( struct user_fpu_struct , fpscr ) ) {
tmp = FPSCR_INIT ;
} else {
tmp = 0xffffffffUL ; /* matches initial value in fpu.c */
}
return tmp ;
}
if ( last_task_used_math = = task ) {
2007-11-10 14:27:03 +03:00
enable_fpu ( ) ;
2007-11-22 11:30:50 +03:00
save_fpu ( task , regs ) ;
2007-11-10 14:27:03 +03:00
disable_fpu ( ) ;
2005-04-17 02:20:36 +04:00
last_task_used_math = 0 ;
regs - > sr | = SR_FD ;
}
tmp = ( ( long * ) & task - > thread . fpu ) [ addr / sizeof ( unsigned long ) ] ;
return tmp ;
}
/*
* This routine will put a word into the user area in the process kernel stack .
*/
static inline int put_stack_long ( struct task_struct * task , int offset ,
unsigned long data )
{
unsigned char * stack ;
stack = ( unsigned char * ) ( task - > thread . uregs ) ;
stack + = offset ;
* ( unsigned long * ) stack = data ;
return 0 ;
}
static inline int
put_fpu_long ( struct task_struct * task , unsigned long addr , unsigned long data )
{
struct pt_regs * regs ;
regs = ( struct pt_regs * ) ( ( unsigned char * ) task + THREAD_SIZE ) - 1 ;
if ( ! tsk_used_math ( task ) ) {
fpinit ( & task - > thread . fpu . hard ) ;
set_stopped_child_used_math ( task ) ;
} else if ( last_task_used_math = = task ) {
2007-11-10 14:27:03 +03:00
enable_fpu ( ) ;
2007-11-22 11:30:50 +03:00
save_fpu ( task , regs ) ;
2007-11-10 14:27:03 +03:00
disable_fpu ( ) ;
2005-04-17 02:20:36 +04:00
last_task_used_math = 0 ;
regs - > sr | = SR_FD ;
}
( ( long * ) & task - > thread . fpu ) [ addr / sizeof ( unsigned long ) ] = data ;
return 0 ;
}
2008-07-30 14:09:31 +04:00
void user_enable_single_step ( struct task_struct * child )
{
struct pt_regs * regs = child - > thread . uregs ;
regs - > sr | = SR_SSTEP ; /* auto-resetting upon exception */
}
void user_disable_single_step ( struct task_struct * child )
{
2008-08-22 19:20:36 +04:00
struct pt_regs * regs = child - > thread . uregs ;
2008-07-30 14:09:31 +04:00
regs - > sr & = ~ SR_SSTEP ;
}
2005-11-07 11:59:47 +03:00
2008-12-10 14:14:15 +03:00
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 ;
/* PC, SR, SYSCALL */
ret = user_regset_copyout ( & pos , & count , & kbuf , & ubuf ,
& regs - > pc ,
0 , 3 * sizeof ( unsigned long long ) ) ;
/* R1 -> R63 */
if ( ! ret )
ret = user_regset_copyout ( & pos , & count , & kbuf , & ubuf ,
regs - > regs ,
offsetof ( struct pt_regs , regs [ 0 ] ) ,
63 * sizeof ( unsigned long long ) ) ;
/* TR0 -> TR7 */
if ( ! ret )
ret = user_regset_copyout ( & pos , & count , & kbuf , & ubuf ,
regs - > tregs ,
offsetof ( struct pt_regs , tregs [ 0 ] ) ,
8 * sizeof ( unsigned long long ) ) ;
if ( ! ret )
ret = user_regset_copyout_zero ( & pos , & count , & kbuf , & ubuf ,
sizeof ( struct pt_regs ) , - 1 ) ;
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 )
{
struct pt_regs * regs = task_pt_regs ( target ) ;
int ret ;
/* PC, SR, SYSCALL */
ret = user_regset_copyin ( & pos , & count , & kbuf , & ubuf ,
& regs - > pc ,
0 , 3 * sizeof ( unsigned long long ) ) ;
/* R1 -> R63 */
if ( ! ret & & count > 0 )
ret = user_regset_copyin ( & pos , & count , & kbuf , & ubuf ,
regs - > regs ,
offsetof ( struct pt_regs , regs [ 0 ] ) ,
63 * sizeof ( unsigned long long ) ) ;
/* TR0 -> TR7 */
if ( ! ret & & count > 0 )
ret = user_regset_copyin ( & pos , & count , & kbuf , & ubuf ,
regs - > tregs ,
offsetof ( struct pt_regs , tregs [ 0 ] ) ,
8 * sizeof ( unsigned long long ) ) ;
if ( ! ret )
ret = user_regset_copyin_ignore ( & pos , & count , & kbuf , & ubuf ,
sizeof ( struct pt_regs ) , - 1 ) ;
return ret ;
}
# ifdef CONFIG_SH_FPU
int fpregs_get ( struct task_struct * target ,
const struct user_regset * regset ,
unsigned int pos , unsigned int count ,
void * kbuf , void __user * ubuf )
{
int ret ;
ret = init_fpu ( target ) ;
if ( ret )
return ret ;
return user_regset_copyout ( & pos , & count , & kbuf , & ubuf ,
& target - > thread . fpu . hard , 0 , - 1 ) ;
}
static int fpregs_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 ;
ret = init_fpu ( target ) ;
if ( ret )
return ret ;
set_stopped_child_used_math ( target ) ;
return user_regset_copyin ( & pos , & count , & kbuf , & ubuf ,
& target - > thread . fpu . hard , 0 , - 1 ) ;
}
static int fpregs_active ( struct task_struct * target ,
const struct user_regset * regset )
{
return tsk_used_math ( target ) ? regset - > n : 0 ;
}
# endif
/*
* These are our native regset flavours .
*/
enum sh_regset {
REGSET_GENERAL ,
# ifdef CONFIG_SH_FPU
REGSET_FPU ,
# endif
} ;
static const struct user_regset sh_regsets [ ] = {
/*
* Format is :
* PC , SR , SYSCALL ,
* R1 - - > R63 ,
* TR0 - - > TR7 ,
*/
[ REGSET_GENERAL ] = {
. core_note_type = NT_PRSTATUS ,
. n = ELF_NGREG ,
. size = sizeof ( long long ) ,
. align = sizeof ( long long ) ,
. get = genregs_get ,
. set = genregs_set ,
} ,
# ifdef CONFIG_SH_FPU
[ REGSET_FPU ] = {
. core_note_type = NT_PRFPREG ,
. n = sizeof ( struct user_fpu_struct ) /
sizeof ( long long ) ,
. size = sizeof ( long long ) ,
. align = sizeof ( long long ) ,
. get = fpregs_get ,
. set = fpregs_set ,
. active = fpregs_active ,
} ,
# endif
} ;
static const struct user_regset_view user_sh64_native_view = {
. name = " sh64 " ,
. e_machine = EM_SH ,
. regsets = sh_regsets ,
. n = ARRAY_SIZE ( sh_regsets ) ,
} ;
const struct user_regset_view * task_user_regset_view ( struct task_struct * task )
{
return & user_sh64_native_view ;
}
2005-11-07 11:59:47 +03:00
long arch_ptrace ( struct task_struct * child , long request , long addr , long data )
2005-04-17 02:20:36 +04:00
{
int ret ;
switch ( request ) {
/* read the word at location addr in the USER area. */
case PTRACE_PEEKUSR : {
unsigned long tmp ;
ret = - EIO ;
if ( ( addr & 3 ) | | addr < 0 )
break ;
if ( addr < sizeof ( struct pt_regs ) )
tmp = get_stack_long ( child , addr ) ;
else if ( ( addr > = offsetof ( struct user , fpu ) ) & &
( addr < offsetof ( struct user , u_fpvalid ) ) ) {
tmp = get_fpu_long ( child , addr - offsetof ( struct user , fpu ) ) ;
} else if ( addr = = offsetof ( struct user , u_fpvalid ) ) {
tmp = ! ! tsk_used_math ( child ) ;
} else {
break ;
}
ret = put_user ( tmp , ( unsigned long * ) data ) ;
break ;
}
case PTRACE_POKEUSR :
/* write the word at location addr in the USER area. We must
disallow any changes to certain SR bits or u_fpvalid , since
this could crash the kernel or result in a security
loophole . */
ret = - EIO ;
if ( ( addr & 3 ) | | addr < 0 )
break ;
if ( addr < sizeof ( struct pt_regs ) ) {
/* Ignore change of top 32 bits of SR */
if ( addr = = offsetof ( struct pt_regs , sr ) + 4 )
{
ret = 0 ;
break ;
}
/* If lower 32 bits of SR, ignore non-user bits */
if ( addr = = offsetof ( struct pt_regs , sr ) )
{
long cursr = get_stack_long ( child , addr ) ;
data & = ~ ( SR_MASK ) ;
data | = ( cursr & SR_MASK ) ;
}
ret = put_stack_long ( child , addr , data ) ;
}
else if ( ( addr > = offsetof ( struct user , fpu ) ) & &
( addr < offsetof ( struct user , u_fpvalid ) ) ) {
ret = put_fpu_long ( child , addr - offsetof ( struct user , fpu ) , data ) ;
}
break ;
2008-12-10 14:14:15 +03:00
case PTRACE_GETREGS :
return copy_regset_to_user ( child , & user_sh64_native_view ,
REGSET_GENERAL ,
0 , sizeof ( struct pt_regs ) ,
( void __user * ) data ) ;
case PTRACE_SETREGS :
return copy_regset_from_user ( child , & user_sh64_native_view ,
REGSET_GENERAL ,
0 , sizeof ( struct pt_regs ) ,
( const void __user * ) data ) ;
# ifdef CONFIG_SH_FPU
case PTRACE_GETFPREGS :
return copy_regset_to_user ( child , & user_sh64_native_view ,
REGSET_FPU ,
0 , sizeof ( struct user_fpu_struct ) ,
( void __user * ) data ) ;
case PTRACE_SETFPREGS :
return copy_regset_from_user ( child , & user_sh64_native_view ,
REGSET_FPU ,
0 , sizeof ( struct user_fpu_struct ) ,
( const void __user * ) data ) ;
# endif
2005-04-17 02:20:36 +04:00
default :
ret = ptrace_request ( child , request , addr , data ) ;
break ;
}
2008-12-10 14:14:15 +03:00
2005-04-17 02:20:36 +04:00
return ret ;
}
2005-11-07 11:59:47 +03:00
asmlinkage int sh64_ptrace ( long request , long pid , long addr , long data )
{
# define WPC_DBRMODE 0x0d104008
static int first_call = 1 ;
lock_kernel ( ) ;
if ( first_call ) {
/* Set WPC.DBRMODE to 0. This makes all debug events get
* delivered through RESVEC , i . e . into the handlers in entry . S .
* ( If the kernel was downloaded using a remote gdb , WPC . DBRMODE
* would normally be left set to 1 , which makes debug events get
* delivered through DBRVEC , i . e . into the remote gdb ' s
* handlers . This prevents ptrace getting them , and confuses
* the remote gdb . ) */
printk ( " DBRMODE set to 0 to permit native debugging \n " ) ;
poke_real_address_q ( WPC_DBRMODE , 0 ) ;
first_call = 0 ;
}
unlock_kernel ( ) ;
return sys_ptrace ( request , pid , addr , data ) ;
}
2008-07-30 15:05:35 +04:00
static inline int audit_arch ( void )
{
int arch = EM_SH ;
# ifdef CONFIG_64BIT
arch | = __AUDIT_ARCH_64BIT ;
# endif
# ifdef CONFIG_CPU_LITTLE_ENDIAN
arch | = __AUDIT_ARCH_LE ;
# endif
return arch ;
}
2008-07-30 14:55:30 +04:00
asmlinkage long long do_syscall_trace_enter ( struct pt_regs * regs )
2005-04-17 02:20:36 +04:00
{
2008-07-30 14:55:30 +04:00
long long ret = 0 ;
2005-04-17 02:20:36 +04:00
2008-07-30 10:30:52 +04:00
secure_computing ( regs - > regs [ 9 ] ) ;
2008-07-30 14:55:30 +04:00
if ( test_thread_flag ( TIF_SYSCALL_TRACE ) & &
tracehook_report_syscall_entry ( regs ) )
/*
* Tracing decided this syscall should not happen .
* We ' ll return a bogus call number to get an ENOSYS
* error , but leave the original number in regs - > regs [ 0 ] .
*/
ret = - 1LL ;
2007-11-28 13:58:11 +03:00
2008-07-30 14:55:30 +04:00
if ( unlikely ( current - > audit_context ) )
2008-07-30 15:05:35 +04:00
audit_syscall_entry ( audit_arch ( ) , regs - > regs [ 1 ] ,
2007-11-28 13:58:11 +03:00
regs - > regs [ 2 ] , regs - > regs [ 3 ] ,
regs - > regs [ 4 ] , regs - > regs [ 5 ] ) ;
2008-07-30 14:55:30 +04:00
return ret ? : regs - > regs [ 9 ] ;
}
asmlinkage void do_syscall_trace_leave ( struct pt_regs * regs )
{
if ( unlikely ( current - > audit_context ) )
audit_syscall_exit ( AUDITSC_RESULT ( regs - > regs [ 9 ] ) ,
regs - > regs [ 9 ] ) ;
if ( test_thread_flag ( TIF_SYSCALL_TRACE ) )
tracehook_report_syscall_exit ( regs , 0 ) ;
2005-04-17 02:20:36 +04:00
}
/* Called with interrupts disabled */
asmlinkage void do_single_step ( unsigned long long vec , struct pt_regs * regs )
{
/* This is called after a single step exception (DEBUGSS).
There is no need to change the PC , as it is a post - execution
exception , as entry . S does not do anything to the PC for DEBUGSS .
We need to clear the Single Step setting in SR to avoid
continually stepping . */
local_irq_enable ( ) ;
regs - > sr & = ~ SR_SSTEP ;
force_sig ( SIGTRAP , current ) ;
}
/* Called with interrupts disabled */
asmlinkage void do_software_break_point ( unsigned long long vec ,
struct pt_regs * regs )
{
/* We need to forward step the PC, to counteract the backstep done
in signal . c . */
local_irq_enable ( ) ;
force_sig ( SIGTRAP , current ) ;
regs - > pc + = 4 ;
}
/*
* Called by kernel / ptrace . c when detaching . .
*
* Make sure single step bits etc are not set .
*/
void ptrace_disable ( struct task_struct * child )
{
2008-07-30 14:09:31 +04:00
user_disable_single_step ( child ) ;
2005-04-17 02:20:36 +04:00
}