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/*
* 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 .
*
* Copyright ( C ) 1991 , 1992 Linus Torvalds
* Copyright ( C ) 1994 - 2000 Ralf Baechle
* Copyright ( C ) 1999 , 2000 Silicon Graphics , Inc .
*/
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# include <linux/cache.h>
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# include <linux/irqflags.h>
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# include <linux/sched.h>
# include <linux/mm.h>
# include <linux/personality.h>
# include <linux/smp.h>
# include <linux/kernel.h>
# include <linux/signal.h>
# include <linux/errno.h>
# include <linux/wait.h>
# include <linux/ptrace.h>
# include <linux/unistd.h>
# include <linux/compiler.h>
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# include <linux/syscalls.h>
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# include <linux/uaccess.h>
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# include <linux/tracehook.h>
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# include <asm/abi.h>
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# include <asm/asm.h>
# include <linux/bitops.h>
# include <asm/cacheflush.h>
# include <asm/fpu.h>
# include <asm/sim.h>
# include <asm/ucontext.h>
# include <asm/cpu-features.h>
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# include <asm/war.h>
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# include <asm/vdso.h>
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# include <asm/dsp.h>
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# include "signal-common.h"
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static int ( * save_fp_context ) ( struct sigcontext __user * sc ) ;
static int ( * restore_fp_context ) ( struct sigcontext __user * sc ) ;
extern asmlinkage int _save_fp_context ( struct sigcontext __user * sc ) ;
extern asmlinkage int _restore_fp_context ( struct sigcontext __user * sc ) ;
extern asmlinkage int fpu_emulator_save_context ( struct sigcontext __user * sc ) ;
extern asmlinkage int fpu_emulator_restore_context ( struct sigcontext __user * sc ) ;
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struct sigframe {
u32 sf_ass [ 4 ] ; /* argument save space for o32 */
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u32 sf_pad [ 2 ] ; /* Was: signal trampoline */
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struct sigcontext sf_sc ;
sigset_t sf_mask ;
} ;
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struct rt_sigframe {
u32 rs_ass [ 4 ] ; /* argument save space for o32 */
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u32 rs_pad [ 2 ] ; /* Was: signal trampoline */
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struct siginfo rs_info ;
struct ucontext rs_uc ;
} ;
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/*
* Helper routines
*/
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static int protected_save_fp_context ( struct sigcontext __user * sc )
{
int err ;
while ( 1 ) {
lock_fpu_owner ( ) ;
own_fpu_inatomic ( 1 ) ;
err = save_fp_context ( sc ) ; /* this might fail */
unlock_fpu_owner ( ) ;
if ( likely ( ! err ) )
break ;
/* touch the sigcontext and try again */
err = __put_user ( 0 , & sc - > sc_fpregs [ 0 ] ) |
__put_user ( 0 , & sc - > sc_fpregs [ 31 ] ) |
__put_user ( 0 , & sc - > sc_fpc_csr ) ;
if ( err )
break ; /* really bad sigcontext */
}
return err ;
}
static int protected_restore_fp_context ( struct sigcontext __user * sc )
{
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int err , tmp __maybe_unused ;
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while ( 1 ) {
lock_fpu_owner ( ) ;
own_fpu_inatomic ( 0 ) ;
err = restore_fp_context ( sc ) ; /* this might fail */
unlock_fpu_owner ( ) ;
if ( likely ( ! err ) )
break ;
/* touch the sigcontext and try again */
err = __get_user ( tmp , & sc - > sc_fpregs [ 0 ] ) |
__get_user ( tmp , & sc - > sc_fpregs [ 31 ] ) |
__get_user ( tmp , & sc - > sc_fpc_csr ) ;
if ( err )
break ; /* really bad sigcontext */
}
return err ;
}
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int setup_sigcontext ( struct pt_regs * regs , struct sigcontext __user * sc )
{
int err = 0 ;
int i ;
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unsigned int used_math ;
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err | = __put_user ( regs - > cp0_epc , & sc - > sc_pc ) ;
err | = __put_user ( 0 , & sc - > sc_regs [ 0 ] ) ;
for ( i = 1 ; i < 32 ; i + + )
err | = __put_user ( regs - > regs [ i ] , & sc - > sc_regs [ i ] ) ;
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# ifdef CONFIG_CPU_HAS_SMARTMIPS
err | = __put_user ( regs - > acx , & sc - > sc_acx ) ;
# endif
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err | = __put_user ( regs - > hi , & sc - > sc_mdhi ) ;
err | = __put_user ( regs - > lo , & sc - > sc_mdlo ) ;
if ( cpu_has_dsp ) {
err | = __put_user ( mfhi1 ( ) , & sc - > sc_hi1 ) ;
err | = __put_user ( mflo1 ( ) , & sc - > sc_lo1 ) ;
err | = __put_user ( mfhi2 ( ) , & sc - > sc_hi2 ) ;
err | = __put_user ( mflo2 ( ) , & sc - > sc_lo2 ) ;
err | = __put_user ( mfhi3 ( ) , & sc - > sc_hi3 ) ;
err | = __put_user ( mflo3 ( ) , & sc - > sc_lo3 ) ;
err | = __put_user ( rddsp ( DSP_MASK ) , & sc - > sc_dsp ) ;
}
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used_math = ! ! used_math ( ) ;
err | = __put_user ( used_math , & sc - > sc_used_math ) ;
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if ( used_math ) {
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/*
* Save FPU state to signal context . Signal handler
* will " inherit " current FPU state .
*/
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err | = protected_save_fp_context ( sc ) ;
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}
return err ;
}
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int fpcsr_pending ( unsigned int __user * fpcsr )
{
int err , sig = 0 ;
unsigned int csr , enabled ;
err = __get_user ( csr , fpcsr ) ;
enabled = FPU_CSR_UNI_X | ( ( csr & FPU_CSR_ALL_E ) < < 5 ) ;
/*
* If the signal handler set some FPU exceptions , clear it and
* send SIGFPE .
*/
if ( csr & enabled ) {
csr & = ~ enabled ;
err | = __put_user ( csr , fpcsr ) ;
sig = SIGFPE ;
}
return err ? : sig ;
}
static int
check_and_restore_fp_context ( struct sigcontext __user * sc )
{
int err , sig ;
err = sig = fpcsr_pending ( & sc - > sc_fpc_csr ) ;
if ( err > 0 )
err = 0 ;
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err | = protected_restore_fp_context ( sc ) ;
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return err ? : sig ;
}
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int restore_sigcontext ( struct pt_regs * regs , struct sigcontext __user * sc )
{
unsigned int used_math ;
unsigned long treg ;
int err = 0 ;
int i ;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info ( ) - > restart_block . fn = do_no_restart_syscall ;
err | = __get_user ( regs - > cp0_epc , & sc - > sc_pc ) ;
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# ifdef CONFIG_CPU_HAS_SMARTMIPS
err | = __get_user ( regs - > acx , & sc - > sc_acx ) ;
# endif
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err | = __get_user ( regs - > hi , & sc - > sc_mdhi ) ;
err | = __get_user ( regs - > lo , & sc - > sc_mdlo ) ;
if ( cpu_has_dsp ) {
err | = __get_user ( treg , & sc - > sc_hi1 ) ; mthi1 ( treg ) ;
err | = __get_user ( treg , & sc - > sc_lo1 ) ; mtlo1 ( treg ) ;
err | = __get_user ( treg , & sc - > sc_hi2 ) ; mthi2 ( treg ) ;
err | = __get_user ( treg , & sc - > sc_lo2 ) ; mtlo2 ( treg ) ;
err | = __get_user ( treg , & sc - > sc_hi3 ) ; mthi3 ( treg ) ;
err | = __get_user ( treg , & sc - > sc_lo3 ) ; mtlo3 ( treg ) ;
err | = __get_user ( treg , & sc - > sc_dsp ) ; wrdsp ( treg , DSP_MASK ) ;
}
for ( i = 1 ; i < 32 ; i + + )
err | = __get_user ( regs - > regs [ i ] , & sc - > sc_regs [ i ] ) ;
err | = __get_user ( used_math , & sc - > sc_used_math ) ;
conditional_used_math ( used_math ) ;
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if ( used_math ) {
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/* restore fpu context if we have used it before */
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if ( ! err )
err = check_and_restore_fp_context ( sc ) ;
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} else {
/* signal handler may have used FPU. Give it up. */
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lose_fpu ( 0 ) ;
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}
return err ;
}
void __user * get_sigframe ( struct k_sigaction * ka , struct pt_regs * regs ,
size_t frame_size )
{
unsigned long sp ;
/* Default to using normal stack */
sp = regs - > regs [ 29 ] ;
/*
* FPU emulator may have it ' s own trampoline active just
* above the user stack , 16 - bytes before the next lowest
* 16 byte boundary . Try to avoid trashing it .
*/
sp - = 32 ;
/* This is the X/Open sanctioned signal stack switching. */
if ( ( ka - > sa . sa_flags & SA_ONSTACK ) & & ( sas_ss_flags ( sp ) = = 0 ) )
sp = current - > sas_ss_sp + current - > sas_ss_size ;
return ( void __user * ) ( ( sp - frame_size ) & ( ICACHE_REFILLS_WORKAROUND_WAR ? ~ ( cpu_icache_line_size ( ) - 1 ) : ALMASK ) ) ;
}
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/*
* Atomically swap in the new signal mask , and wait for a signal .
*/
# ifdef CONFIG_TRAD_SIGNALS
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asmlinkage int sys_sigsuspend ( nabi_no_regargs struct pt_regs regs )
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{
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sigset_t newset ;
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sigset_t __user * uset ;
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uset = ( sigset_t __user * ) regs . regs [ 4 ] ;
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if ( copy_from_user ( & newset , uset , sizeof ( sigset_t ) ) )
return - EFAULT ;
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return sigsuspend ( & newset ) ;
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}
# endif
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asmlinkage int sys_rt_sigsuspend ( nabi_no_regargs struct pt_regs regs )
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{
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sigset_t newset ;
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sigset_t __user * unewset ;
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size_t sigsetsize ;
/* XXX Don't preclude handling different sized sigset_t's. */
sigsetsize = regs . regs [ 5 ] ;
if ( sigsetsize ! = sizeof ( sigset_t ) )
return - EINVAL ;
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unewset = ( sigset_t __user * ) regs . regs [ 4 ] ;
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if ( copy_from_user ( & newset , unewset , sizeof ( newset ) ) )
return - EFAULT ;
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return sigsuspend ( & newset ) ;
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}
# ifdef CONFIG_TRAD_SIGNALS
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SYSCALL_DEFINE3 ( sigaction , int , sig , const struct sigaction __user * , act ,
struct sigaction __user * , oact )
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{
struct k_sigaction new_ka , old_ka ;
int ret ;
int err = 0 ;
if ( act ) {
old_sigset_t mask ;
if ( ! access_ok ( VERIFY_READ , act , sizeof ( * act ) ) )
return - EFAULT ;
err | = __get_user ( new_ka . sa . sa_handler , & act - > sa_handler ) ;
err | = __get_user ( new_ka . sa . sa_flags , & act - > sa_flags ) ;
err | = __get_user ( mask , & act - > sa_mask . sig [ 0 ] ) ;
if ( err )
return - EFAULT ;
siginitset ( & new_ka . sa . sa_mask , mask ) ;
}
ret = do_sigaction ( sig , act ? & new_ka : NULL , oact ? & old_ka : NULL ) ;
if ( ! ret & & oact ) {
if ( ! access_ok ( VERIFY_WRITE , oact , sizeof ( * oact ) ) )
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return - EFAULT ;
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err | = __put_user ( old_ka . sa . sa_flags , & oact - > sa_flags ) ;
err | = __put_user ( old_ka . sa . sa_handler , & oact - > sa_handler ) ;
err | = __put_user ( old_ka . sa . sa_mask . sig [ 0 ] , oact - > sa_mask . sig ) ;
err | = __put_user ( 0 , & oact - > sa_mask . sig [ 1 ] ) ;
err | = __put_user ( 0 , & oact - > sa_mask . sig [ 2 ] ) ;
err | = __put_user ( 0 , & oact - > sa_mask . sig [ 3 ] ) ;
if ( err )
return - EFAULT ;
}
return ret ;
}
# endif
asmlinkage int sys_sigaltstack ( nabi_no_regargs struct pt_regs regs )
{
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const stack_t __user * uss = ( const stack_t __user * ) regs . regs [ 4 ] ;
stack_t __user * uoss = ( stack_t __user * ) regs . regs [ 5 ] ;
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unsigned long usp = regs . regs [ 29 ] ;
return do_sigaltstack ( uss , uoss , usp ) ;
}
# ifdef CONFIG_TRAD_SIGNALS
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asmlinkage void sys_sigreturn ( nabi_no_regargs struct pt_regs regs )
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{
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struct sigframe __user * frame ;
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sigset_t blocked ;
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int sig ;
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frame = ( struct sigframe __user * ) regs . regs [ 29 ] ;
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if ( ! access_ok ( VERIFY_READ , frame , sizeof ( * frame ) ) )
goto badframe ;
if ( __copy_from_user ( & blocked , & frame - > sf_mask , sizeof ( blocked ) ) )
goto badframe ;
sigdelsetmask ( & blocked , ~ _BLOCKABLE ) ;
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set_current_blocked ( & blocked ) ;
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sig = restore_sigcontext ( & regs , & frame - > sf_sc ) ;
if ( sig < 0 )
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goto badframe ;
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else if ( sig )
force_sig ( sig , current ) ;
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/*
* Don ' t let your children do this . . .
*/
__asm__ __volatile__ (
" move \t $29, %0 \n \t "
" j \t syscall_exit "
: /* no outputs */
: " r " ( & regs ) ) ;
/* Unreached */
badframe :
force_sig ( SIGSEGV , current ) ;
}
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# endif /* CONFIG_TRAD_SIGNALS */
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asmlinkage void sys_rt_sigreturn ( nabi_no_regargs struct pt_regs regs )
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{
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struct rt_sigframe __user * frame ;
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sigset_t set ;
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int sig ;
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frame = ( struct rt_sigframe __user * ) regs . regs [ 29 ] ;
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if ( ! access_ok ( VERIFY_READ , frame , sizeof ( * frame ) ) )
goto badframe ;
if ( __copy_from_user ( & set , & frame - > rs_uc . uc_sigmask , sizeof ( set ) ) )
goto badframe ;
sigdelsetmask ( & set , ~ _BLOCKABLE ) ;
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set_current_blocked ( & set ) ;
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sig = restore_sigcontext ( & regs , & frame - > rs_uc . uc_mcontext ) ;
if ( sig < 0 )
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goto badframe ;
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else if ( sig )
force_sig ( sig , current ) ;
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/* It is more difficult to avoid calling this function than to
call it and ignore errors . */
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do_sigaltstack ( & frame - > rs_uc . uc_stack , NULL , regs . regs [ 29 ] ) ;
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/*
* Don ' t let your children do this . . .
*/
__asm__ __volatile__ (
" move \t $29, %0 \n \t "
" j \t syscall_exit "
: /* no outputs */
: " r " ( & regs ) ) ;
/* Unreached */
badframe :
force_sig ( SIGSEGV , current ) ;
}
# ifdef CONFIG_TRAD_SIGNALS
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static int setup_frame ( void * sig_return , struct k_sigaction * ka ,
struct pt_regs * regs , int signr , sigset_t * set )
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{
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struct sigframe __user * frame ;
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int err = 0 ;
frame = get_sigframe ( ka , regs , sizeof ( * frame ) ) ;
if ( ! access_ok ( VERIFY_WRITE , frame , sizeof ( * frame ) ) )
goto give_sigsegv ;
err | = setup_sigcontext ( regs , & frame - > sf_sc ) ;
err | = __copy_to_user ( & frame - > sf_mask , set , sizeof ( * set ) ) ;
if ( err )
goto give_sigsegv ;
/*
* Arguments to signal handler :
*
* a0 = signal number
* a1 = 0 ( should be cause )
* a2 = pointer to struct sigcontext
*
* $ 25 and c0_epc point to the signal handler , $ 29 points to the
* struct sigframe .
*/
regs - > regs [ 4 ] = signr ;
regs - > regs [ 5 ] = 0 ;
regs - > regs [ 6 ] = ( unsigned long ) & frame - > sf_sc ;
regs - > regs [ 29 ] = ( unsigned long ) frame ;
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regs - > regs [ 31 ] = ( unsigned long ) sig_return ;
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regs - > cp0_epc = regs - > regs [ 25 ] = ( unsigned long ) ka - > sa . sa_handler ;
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DEBUGP ( " SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx \n " ,
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current - > comm , current - > pid ,
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frame , regs - > cp0_epc , regs - > regs [ 31 ] ) ;
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return 0 ;
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give_sigsegv :
force_sigsegv ( signr , current ) ;
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return - EFAULT ;
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}
# endif
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static int setup_rt_frame ( void * sig_return , struct k_sigaction * ka ,
struct pt_regs * regs , int signr , sigset_t * set ,
siginfo_t * info )
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{
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struct rt_sigframe __user * frame ;
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int err = 0 ;
frame = get_sigframe ( ka , regs , sizeof ( * frame ) ) ;
if ( ! access_ok ( VERIFY_WRITE , frame , sizeof ( * frame ) ) )
goto give_sigsegv ;
/* Create siginfo. */
err | = copy_siginfo_to_user ( & frame - > rs_info , info ) ;
/* Create the ucontext. */
err | = __put_user ( 0 , & frame - > rs_uc . uc_flags ) ;
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err | = __put_user ( NULL , & frame - > rs_uc . uc_link ) ;
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err | = __put_user ( ( void __user * ) current - > sas_ss_sp ,
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& frame - > rs_uc . uc_stack . ss_sp ) ;
err | = __put_user ( sas_ss_flags ( regs - > regs [ 29 ] ) ,
& frame - > rs_uc . uc_stack . ss_flags ) ;
err | = __put_user ( current - > sas_ss_size ,
& frame - > rs_uc . uc_stack . ss_size ) ;
err | = setup_sigcontext ( regs , & frame - > rs_uc . uc_mcontext ) ;
err | = __copy_to_user ( & frame - > rs_uc . uc_sigmask , set , sizeof ( * set ) ) ;
if ( err )
goto give_sigsegv ;
/*
* Arguments to signal handler :
*
* a0 = signal number
* a1 = 0 ( should be cause )
* a2 = pointer to ucontext
*
* $ 25 and c0_epc point to the signal handler , $ 29 points to
* the struct rt_sigframe .
*/
regs - > regs [ 4 ] = signr ;
regs - > regs [ 5 ] = ( unsigned long ) & frame - > rs_info ;
regs - > regs [ 6 ] = ( unsigned long ) & frame - > rs_uc ;
regs - > regs [ 29 ] = ( unsigned long ) frame ;
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regs - > regs [ 31 ] = ( unsigned long ) sig_return ;
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regs - > cp0_epc = regs - > regs [ 25 ] = ( unsigned long ) ka - > sa . sa_handler ;
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DEBUGP ( " SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx \n " ,
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current - > comm , current - > pid ,
frame , regs - > cp0_epc , regs - > regs [ 31 ] ) ;
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return 0 ;
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give_sigsegv :
force_sigsegv ( signr , current ) ;
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return - EFAULT ;
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}
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struct mips_abi mips_abi = {
# ifdef CONFIG_TRAD_SIGNALS
. setup_frame = setup_frame ,
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. signal_return_offset = offsetof ( struct mips_vdso , signal_trampoline ) ,
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# endif
. setup_rt_frame = setup_rt_frame ,
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. rt_signal_return_offset =
offsetof ( struct mips_vdso , rt_signal_trampoline ) ,
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. restart = __NR_restart_syscall
} ;
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static int handle_signal ( unsigned long sig , siginfo_t * info ,
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struct k_sigaction * ka , struct pt_regs * regs )
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{
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sigset_t * oldset = sigmask_to_save ( ) ;
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int ret ;
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struct mips_abi * abi = current - > thread . abi ;
void * vdso = current - > mm - > context . vdso ;
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if ( regs - > regs [ 0 ] ) {
switch ( regs - > regs [ 2 ] ) {
case ERESTART_RESTARTBLOCK :
case ERESTARTNOHAND :
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regs - > regs [ 2 ] = EINTR ;
break ;
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case ERESTARTSYS :
if ( ! ( ka - > sa . sa_flags & SA_RESTART ) ) {
regs - > regs [ 2 ] = EINTR ;
break ;
}
/* fallthrough */
case ERESTARTNOINTR :
regs - > regs [ 7 ] = regs - > regs [ 26 ] ;
regs - > regs [ 2 ] = regs - > regs [ 0 ] ;
regs - > cp0_epc - = 4 ;
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}
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regs - > regs [ 0 ] = 0 ; /* Don't deal with this again. */
}
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if ( sig_uses_siginfo ( ka ) )
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ret = abi - > setup_rt_frame ( vdso + abi - > rt_signal_return_offset ,
ka , regs , sig , oldset , info ) ;
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else
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ret = abi - > setup_frame ( vdso + abi - > signal_return_offset ,
ka , regs , sig , oldset ) ;
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if ( ret )
return ret ;
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block_sigmask ( ka , sig ) ;
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return ret ;
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}
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static void do_signal ( struct pt_regs * regs )
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{
struct k_sigaction ka ;
siginfo_t info ;
int signr ;
/*
* We want the common case to go fast , which is why we may in certain
* cases get here from kernel mode . Just return without doing anything
* if so .
*/
if ( ! user_mode ( regs ) )
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return ;
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signr = get_signal_to_deliver ( & info , & ka , regs , NULL ) ;
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if ( signr > 0 ) {
/* Whee! Actually deliver the signal. */
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if ( handle_signal ( signr , & info , & ka , regs ) = = 0 ) {
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/*
* A signal was successfully delivered ; the saved
* sigmask will have been stored in the signal frame ,
* and will be restored by sigreturn , so we can simply
* clear the TIF_RESTORE_SIGMASK flag .
*/
if ( test_thread_flag ( TIF_RESTORE_SIGMASK ) )
clear_thread_flag ( TIF_RESTORE_SIGMASK ) ;
}
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return ;
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}
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if ( regs - > regs [ 0 ] ) {
if ( regs - > regs [ 2 ] = = ERESTARTNOHAND | |
regs - > regs [ 2 ] = = ERESTARTSYS | |
regs - > regs [ 2 ] = = ERESTARTNOINTR ) {
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regs - > regs [ 2 ] = regs - > regs [ 0 ] ;
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regs - > regs [ 7 ] = regs - > regs [ 26 ] ;
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regs - > cp0_epc - = 4 ;
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}
if ( regs - > regs [ 2 ] = = ERESTART_RESTARTBLOCK ) {
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regs - > regs [ 2 ] = current - > thread . abi - > restart ;
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regs - > regs [ 7 ] = regs - > regs [ 26 ] ;
regs - > cp0_epc - = 4 ;
}
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regs - > regs [ 0 ] = 0 ; /* Don't deal with this again. */
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}
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/*
* If there ' s no signal to deliver , we just put the saved sigmask
* back
*/
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restore_saved_sigmask ( ) ;
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}
/*
* notification of userspace execution resumption
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* - triggered by the TIF_WORK_MASK flags
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*/
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asmlinkage void do_notify_resume ( struct pt_regs * regs , void * unused ,
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__u32 thread_info_flags )
{
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local_irq_enable ( ) ;
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/* deal with pending signal delivery */
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if ( thread_info_flags & ( _TIF_SIGPENDING | _TIF_RESTORE_SIGMASK ) )
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do_signal ( regs ) ;
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if ( thread_info_flags & _TIF_NOTIFY_RESUME ) {
clear_thread_flag ( TIF_NOTIFY_RESUME ) ;
tracehook_notify_resume ( regs ) ;
}
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}
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# ifdef CONFIG_SMP
static int smp_save_fp_context ( struct sigcontext __user * sc )
{
return raw_cpu_has_fpu
? _save_fp_context ( sc )
: fpu_emulator_save_context ( sc ) ;
}
static int smp_restore_fp_context ( struct sigcontext __user * sc )
{
return raw_cpu_has_fpu
? _restore_fp_context ( sc )
: fpu_emulator_restore_context ( sc ) ;
}
# endif
static int signal_setup ( void )
{
# ifdef CONFIG_SMP
/* For now just do the cpu_has_fpu check when the functions are invoked */
save_fp_context = smp_save_fp_context ;
restore_fp_context = smp_restore_fp_context ;
# else
if ( cpu_has_fpu ) {
save_fp_context = _save_fp_context ;
restore_fp_context = _restore_fp_context ;
} else {
save_fp_context = fpu_emulator_save_context ;
restore_fp_context = fpu_emulator_restore_context ;
}
# endif
return 0 ;
}
arch_initcall ( signal_setup ) ;