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[S390] cleanup trap handling

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Move the program interruption code and the translation exception identifier
to the pt_regs structure as 'int_code' and 'int_parm_long' and make the
first level interrupt handler in entry[64].S store the two values. That
makes it possible to drop 'prot_addr' and 'trap_no' from the thread_struct
and to reduce the number of arguments to a lot of functions. Finally
un-inline do_trap. Overall this saves 5812 bytes in the .text section of
the 64 bit kernel.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2011-12-27 11:27:18 +01:00
parent 679e2ea733
commit aa33c8cbba
12 changed files with 158 additions and 210 deletions
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2
arch/s390/include/asm/kdebug.h
View file

@ -22,6 +22,6 @@ enum die_val {
DIE_NMI_IPI,
};
extern void die(const char *, struct pt_regs *, long);
extern void die(struct pt_regs *, const char *);
#endif

2
arch/s390/include/asm/processor.h
View file

@ -80,8 +80,6 @@ struct thread_struct {
unsigned int acrs[NUM_ACRS];
unsigned long ksp; /* kernel stack pointer */
mm_segment_t mm_segment;
unsigned long prot_addr; /* address of protection-excep. */
unsigned int trap_no;
unsigned long gmap_addr; /* address of last gmap fault. */
struct per_regs per_user; /* User specified PER registers */
struct per_event per_event; /* Cause of the last PER trap */

3
arch/s390/include/asm/ptrace.h
View file

@ -324,7 +324,8 @@ struct pt_regs
psw_t psw;
unsigned long gprs[NUM_GPRS];
unsigned long orig_gpr2;
unsigned int svc_code;
unsigned int int_code;
unsigned long int_parm_long;
};
/*

2
arch/s390/include/asm/syscall.h
View file

@ -27,7 +27,7 @@ static inline long syscall_get_nr(struct task_struct *task,
struct pt_regs *regs)
{
return test_tsk_thread_flag(task, TIF_SYSCALL) ?
(regs->svc_code & 0xffff) : -1;
(regs->int_code & 0xffff) : -1;
}
static inline void syscall_rollback(struct task_struct *task,

3
arch/s390/kernel/asm-offsets.c
View file

@ -45,7 +45,8 @@ int main(void)
DEFINE(__PT_PSW, offsetof(struct pt_regs, psw));
DEFINE(__PT_GPRS, offsetof(struct pt_regs, gprs));
DEFINE(__PT_ORIG_GPR2, offsetof(struct pt_regs, orig_gpr2));
DEFINE(__PT_SVC_CODE, offsetof(struct pt_regs, svc_code));
DEFINE(__PT_INT_CODE, offsetof(struct pt_regs, int_code));
DEFINE(__PT_INT_PARM_LONG, offsetof(struct pt_regs, int_parm_long));
DEFINE(__PT_SIZE, sizeof(struct pt_regs));
BLANK();
DEFINE(__SF_BACKCHAIN, offsetof(struct stack_frame, back_chain));

8
arch/s390/kernel/compat_signal.c
View file

@ -501,8 +501,12 @@ static int setup_frame32(int sig, struct k_sigaction *ka,
/* We forgot to include these in the sigcontext.
To avoid breaking binary compatibility, they are passed as args. */
regs->gprs[4] = current->thread.trap_no;
regs->gprs[5] = current->thread.prot_addr;
if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
sig == SIGTRAP || sig == SIGFPE) {
/* set extra registers only for synchronous signals */
regs->gprs[4] = regs->int_code & 127;
regs->gprs[5] = regs->int_parm_long;
}
/* Place signal number on stack to allow backtrace from handler. */
if (__put_user(regs->gprs[2], (int __force __user *) &frame->signo))

22
arch/s390/kernel/entry.S
View file

@ -184,16 +184,16 @@ sysc_vtime:
stm %r0,%r7,__PT_R0(%r11)
mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC
mvc __PT_PSW(8,%r11),__LC_SVC_OLD_PSW
mvc __PT_SVC_CODE(4,%r11),__LC_SVC_ILC
mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC
sysc_do_svc:
oi __TI_flags+3(%r12),_TIF_SYSCALL
lh %r8,__PT_SVC_CODE+2(%r11)
lh %r8,__PT_INT_CODE+2(%r11)
sla %r8,2 # shift and test for svc0
jnz sysc_nr_ok
# svc 0: system call number in %r1
cl %r1,BASED(.Lnr_syscalls)
jnl sysc_nr_ok
sth %r1,__PT_SVC_CODE+2(%r11)
sth %r1,__PT_INT_CODE+2(%r11)
lr %r8,%r1
sla %r8,2
sysc_nr_ok:
@ -266,9 +266,9 @@ sysc_sigpending:
jno sysc_return
lm %r2,%r7,__PT_R2(%r11) # load svc arguments
xr %r8,%r8 # svc 0 returns -ENOSYS
clc __PT_SVC_CODE+2(2,%r11),BASED(.Lnr_syscalls+2)
clc __PT_INT_CODE+2(2,%r11),BASED(.Lnr_syscalls+2)
jnl sysc_nr_ok # invalid svc number -> do svc 0
lh %r8,__PT_SVC_CODE+2(%r11) # load new svc number
lh %r8,__PT_INT_CODE+2(%r11) # load new svc number
sla %r8,2
j sysc_nr_ok # restart svc
@ -300,7 +300,7 @@ sysc_tracesys:
lr %r2,%r11 # pass pointer to pt_regs
la %r3,0
xr %r0,%r0
icm %r0,3,__PT_SVC_CODE+2(%r11)
icm %r0,3,__PT_INT_CODE+2(%r11)
st %r0,__PT_R2(%r11)
basr %r14,%r1 # call do_syscall_trace_enter
cl %r2,BASED(.Lnr_syscalls)
@ -396,6 +396,8 @@ ENTRY(pgm_check_handler)
stm %r0,%r7,__PT_R0(%r11)
mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC
stm %r8,%r9,__PT_PSW(%r11)
mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC
mvc __PT_INT_PARM_LONG(4,%r11),__LC_TRANS_EXC_CODE
tm __LC_PGM_ILC+3,0x80 # check for per exception
jz 0f
l %r1,__TI_task(%r12)
@ -405,13 +407,11 @@ ENTRY(pgm_check_handler)
mvc __THREAD_per_address(4,%r1),__LC_PER_ADDRESS
mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE
mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID
0: l %r3,__LC_PGM_ILC # load program interruption code
l %r4,__LC_TRANS_EXC_CODE
REENABLE_IRQS
0: REENABLE_IRQS
xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
l %r1,BASED(.Ljump_table)
la %r10,0x7f
nr %r10,%r3
n %r10,__PT_INT_CODE(%r11)
je sysc_return
sll %r10,2
l %r1,0(%r10,%r1) # load address of handler routine
@ -858,7 +858,7 @@ cleanup_system_call:
mvc __PT_R8(32,%r15),__LC_SAVE_AREA_SYNC
stm %r0,%r7,__PT_R0(%r15)
mvc __PT_PSW(8,%r15),__LC_SVC_OLD_PSW
mvc __PT_SVC_CODE(4,%r15),__LC_SVC_ILC
mvc __PT_INT_CODE(4,%r15),__LC_SVC_ILC
# setup saved register 15
ahi %r15,-STACK_FRAME_OVERHEAD
st %r15,28(%r11) # r15 stack pointer

10
arch/s390/kernel/entry.h
View file

@ -6,15 +6,15 @@
#include <asm/ptrace.h>
extern void (*pgm_check_table[128])(struct pt_regs *, long, unsigned long);
extern void (*pgm_check_table[128])(struct pt_regs *);
extern void *restart_stack;
asmlinkage long do_syscall_trace_enter(struct pt_regs *regs);
asmlinkage void do_syscall_trace_exit(struct pt_regs *regs);
void do_protection_exception(struct pt_regs *, long, unsigned long);
void do_dat_exception(struct pt_regs *, long, unsigned long);
void do_asce_exception(struct pt_regs *, long, unsigned long);
void do_protection_exception(struct pt_regs *regs);
void do_dat_exception(struct pt_regs *regs);
void do_asce_exception(struct pt_regs *regs);
void do_per_trap(struct pt_regs *regs);
void syscall_trace(struct pt_regs *regs, int entryexit);
@ -28,7 +28,7 @@ void do_extint(struct pt_regs *regs, unsigned int, unsigned int, unsigned long);
void do_restart(void);
int __cpuinit start_secondary(void *cpuvoid);
void __init startup_init(void);
void die(const char * str, struct pt_regs * regs, long err);
void die(struct pt_regs *regs, const char *str);
void __init time_init(void);

27
arch/s390/kernel/entry64.S
View file

@ -1,4 +1,3 @@
/*
* arch/s390/kernel/entry64.S
* S390 low-level entry points.
@ -200,17 +199,17 @@ sysc_vtime:
stmg %r0,%r7,__PT_R0(%r11)
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW
mvc __PT_SVC_CODE(4,%r11),__LC_SVC_ILC
mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC
sysc_do_svc:
oi __TI_flags+7(%r12),_TIF_SYSCALL
llgh %r8,__PT_SVC_CODE+2(%r11)
llgh %r8,__PT_INT_CODE+2(%r11)
slag %r8,%r8,2 # shift and test for svc 0
jnz sysc_nr_ok
# svc 0: system call number in %r1
llgfr %r1,%r1 # clear high word in r1
cghi %r1,NR_syscalls
jnl sysc_nr_ok
sth %r1,__PT_SVC_CODE+2(%r11)
sth %r1,__PT_INT_CODE+2(%r11)
slag %r8,%r1,2
sysc_nr_ok:
larl %r10,sys_call_table # 64 bit system call table
@ -288,7 +287,7 @@ sysc_sigpending:
jno sysc_return
lmg %r2,%r7,__PT_R2(%r11) # load svc arguments
lghi %r8,0 # svc 0 returns -ENOSYS
lh %r1,__PT_SVC_CODE+2(%r11) # load new svc number
lh %r1,__PT_INT_CODE+2(%r11) # load new svc number
cghi %r1,NR_syscalls
jnl sysc_nr_ok # invalid svc number -> do svc 0
slag %r8,%r1,2
@ -318,7 +317,7 @@ sysc_singlestep:
sysc_tracesys:
lgr %r2,%r11 # pass pointer to pt_regs
la %r3,0
llgh %r0,__PT_SVC_CODE+2(%r11)
llgh %r0,__PT_INT_CODE+2(%r11)
stg %r0,__PT_R2(%r11)
brasl %r14,do_syscall_trace_enter
lghi %r0,NR_syscalls
@ -411,6 +410,8 @@ ENTRY(pgm_check_handler)
stmg %r0,%r7,__PT_R0(%r11)
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
stmg %r8,%r9,__PT_PSW(%r11)
mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC
mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE
stg %r10,__PT_ARGS(%r11)
tm __LC_PGM_ILC+3,0x80 # check for per exception
jz 0f
@ -421,15 +422,13 @@ ENTRY(pgm_check_handler)
mvc __THREAD_per_address(8,%r1),__LC_PER_ADDRESS
mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE
mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID
0: lgf %r3,__LC_PGM_ILC # load program interruption code
lg %r4,__LC_TRANS_EXC_CODE
REENABLE_IRQS
0: REENABLE_IRQS
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
lghi %r10,0x7f
ngr %r10,%r3
je sysc_return
sll %r10,3
larl %r1,pgm_check_table
llgh %r10,__PT_INT_CODE+2(%r11)
nill %r10,0x007f
sll %r10,3
je sysc_return
lg %r1,0(%r10,%r1) # load address of handler routine
lgr %r2,%r11 # pass pointer to pt_regs
basr %r14,%r1 # branch to interrupt-handler
@ -877,7 +876,7 @@ cleanup_system_call:
mvc __PT_R8(64,%r15),__LC_SAVE_AREA_SYNC
stmg %r0,%r7,__PT_R0(%r15)
mvc __PT_PSW(16,%r15),__LC_SVC_OLD_PSW
mvc __PT_SVC_CODE(4,%r15),__LC_SVC_ILC
mvc __PT_INT_CODE(4,%r15),__LC_SVC_ILC
# setup saved register r15
aghi %r15,-STACK_FRAME_OVERHEAD
stg %r15,56(%r11) # r15 stack pointer

20
arch/s390/kernel/signal.c
View file

@ -302,9 +302,13 @@ static int setup_frame(int sig, struct k_sigaction *ka,
/* We forgot to include these in the sigcontext.
To avoid breaking binary compatibility, they are passed as args. */
regs->gprs[4] = current->thread.trap_no;
regs->gprs[5] = current->thread.prot_addr;
regs->gprs[6] = task_thread_info(current)->last_break;
if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
sig == SIGTRAP || sig == SIGFPE) {
/* set extra registers only for synchronous signals */
regs->gprs[4] = regs->int_code & 127;
regs->gprs[5] = regs->int_parm_long;
regs->gprs[6] = task_thread_info(current)->last_break;
}
/* Place signal number on stack to allow backtrace from handler. */
if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
@ -434,13 +438,13 @@ void do_signal(struct pt_regs *regs)
* call information.
*/
current_thread_info()->system_call =
test_thread_flag(TIF_SYSCALL) ? regs->svc_code : 0;
test_thread_flag(TIF_SYSCALL) ? regs->int_code : 0;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
/* Whee! Actually deliver the signal. */
if (current_thread_info()->system_call) {
regs->svc_code = current_thread_info()->system_call;
regs->int_code = current_thread_info()->system_call;
/* Check for system call restarting. */
switch (regs->gprs[2]) {
case -ERESTART_RESTARTBLOCK:
@ -457,7 +461,7 @@ void do_signal(struct pt_regs *regs)
regs->gprs[2] = regs->orig_gpr2;
regs->psw.addr =
__rewind_psw(regs->psw,
regs->svc_code >> 16);
regs->int_code >> 16);
break;
}
}
@ -488,11 +492,11 @@ void do_signal(struct pt_regs *regs)
/* No handlers present - check for system call restart */
clear_thread_flag(TIF_SYSCALL);
if (current_thread_info()->system_call) {
regs->svc_code = current_thread_info()->system_call;
regs->int_code = current_thread_info()->system_call;
switch (regs->gprs[2]) {
case -ERESTART_RESTARTBLOCK:
/* Restart with sys_restart_syscall */
regs->svc_code = __NR_restart_syscall;
regs->int_code = __NR_restart_syscall;
/* fallthrough */
case -ERESTARTNOHAND:
case -ERESTARTSYS:

168
arch/s390/kernel/traps.c
View file

@ -43,7 +43,7 @@
#include <asm/debug.h>
#include "entry.h"
void (*pgm_check_table[128])(struct pt_regs *, long, unsigned long);
void (*pgm_check_table[128])(struct pt_regs *regs);
int show_unhandled_signals;
@ -234,7 +234,7 @@ void show_regs(struct pt_regs *regs)
static DEFINE_SPINLOCK(die_lock);
void die(const char * str, struct pt_regs * regs, long err)
void die(struct pt_regs *regs, const char *str)
{
static int die_counter;
@ -243,7 +243,7 @@ void die(const char * str, struct pt_regs * regs, long err)
console_verbose();
spin_lock_irq(&die_lock);
bust_spinlocks(1);
printk("%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
printk("%s: %04x [#%d] ", str, regs->int_code & 0xffff, ++die_counter);
#ifdef CONFIG_PREEMPT
printk("PREEMPT ");
#endif
@ -254,7 +254,7 @@ void die(const char * str, struct pt_regs * regs, long err)
printk("DEBUG_PAGEALLOC");
#endif
printk("\n");
notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
show_regs(regs);
bust_spinlocks(0);
add_taint(TAINT_DIE);
@ -267,8 +267,7 @@ void die(const char * str, struct pt_regs * regs, long err)
do_exit(SIGSEGV);
}
static void inline report_user_fault(struct pt_regs *regs, long int_code,
int signr)
static inline void report_user_fault(struct pt_regs *regs, int signr)
{
if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
return;
@ -276,7 +275,7 @@ static void inline report_user_fault(struct pt_regs *regs, long int_code,
return;
if (!printk_ratelimit())
return;
printk("User process fault: interruption code 0x%lX ", int_code);
printk("User process fault: interruption code 0x%X ", regs->int_code);
print_vma_addr("in ", regs->psw.addr & PSW_ADDR_INSN);
printk("\n");
show_regs(regs);
@ -287,19 +286,28 @@ int is_valid_bugaddr(unsigned long addr)
return 1;
}
static inline void __kprobes do_trap(long pgm_int_code, int signr, char *str,
struct pt_regs *regs, siginfo_t *info)
static inline void __user *get_psw_address(struct pt_regs *regs)
{
if (notify_die(DIE_TRAP, str, regs, pgm_int_code,
pgm_int_code, signr) == NOTIFY_STOP)
return (void __user *)
((regs->psw.addr - (regs->int_code >> 16)) & PSW_ADDR_INSN);
}
static void __kprobes do_trap(struct pt_regs *regs,
int si_signo, int si_code, char *str)
{
siginfo_t info;
if (notify_die(DIE_TRAP, str, regs, 0,
regs->int_code, si_signo) == NOTIFY_STOP)
return;
if (regs->psw.mask & PSW_MASK_PSTATE) {
struct task_struct *tsk = current;
tsk->thread.trap_no = pgm_int_code & 0xffff;
force_sig_info(signr, info, tsk);
report_user_fault(regs, pgm_int_code, signr);
info.si_signo = si_signo;
info.si_errno = 0;
info.si_code = si_code;
info.si_addr = get_psw_address(regs);
force_sig_info(si_signo, &info, current);
report_user_fault(regs, si_signo);
} else {
const struct exception_table_entry *fixup;
fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
@ -311,18 +319,11 @@ static inline void __kprobes do_trap(long pgm_int_code, int signr, char *str,
btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs);
if (btt == BUG_TRAP_TYPE_WARN)
return;
die(str, regs, pgm_int_code);
die(regs, str);
}
}
}
static inline void __user *get_psw_address(struct pt_regs *regs,
long pgm_int_code)
{
return (void __user *)
((regs->psw.addr - (pgm_int_code >> 16)) & PSW_ADDR_INSN);
}
void __kprobes do_per_trap(struct pt_regs *regs)
{
siginfo_t info;
@ -339,26 +340,19 @@ void __kprobes do_per_trap(struct pt_regs *regs)
force_sig_info(SIGTRAP, &info, current);
}
static void default_trap_handler(struct pt_regs *regs, long pgm_int_code,
unsigned long trans_exc_code)
static void default_trap_handler(struct pt_regs *regs)
{
if (regs->psw.mask & PSW_MASK_PSTATE) {
report_user_fault(regs, pgm_int_code, SIGSEGV);
report_user_fault(regs, SIGSEGV);
do_exit(SIGSEGV);
} else
die("Unknown program exception", regs, pgm_int_code);
die(regs, "Unknown program exception");
}
#define DO_ERROR_INFO(name, signr, sicode, str) \
static void name(struct pt_regs *regs, long pgm_int_code, \
unsigned long trans_exc_code) \
static void name(struct pt_regs *regs) \
{ \
siginfo_t info; \
info.si_signo = signr; \
info.si_errno = 0; \
info.si_code = sicode; \
info.si_addr = get_psw_address(regs, pgm_int_code); \
do_trap(pgm_int_code, signr, str, regs, &info); \
do_trap(regs, signr, sicode, str); \
}
DO_ERROR_INFO(addressing_exception, SIGILL, ILL_ILLADR,
@ -388,42 +382,34 @@ DO_ERROR_INFO(special_op_exception, SIGILL, ILL_ILLOPN,
DO_ERROR_INFO(translation_exception, SIGILL, ILL_ILLOPN,
"translation exception")
static inline void do_fp_trap(struct pt_regs *regs, void __user *location,
int fpc, long pgm_int_code)
static inline void do_fp_trap(struct pt_regs *regs, int fpc)
{
siginfo_t si;
si.si_signo = SIGFPE;
si.si_errno = 0;
si.si_addr = location;
si.si_code = 0;
int si_code = 0;
/* FPC[2] is Data Exception Code */
if ((fpc & 0x00000300) == 0) {
/* bits 6 and 7 of DXC are 0 iff IEEE exception */
if (fpc & 0x8000) /* invalid fp operation */
si.si_code = FPE_FLTINV;
si_code = FPE_FLTINV;
else if (fpc & 0x4000) /* div by 0 */
si.si_code = FPE_FLTDIV;
si_code = FPE_FLTDIV;
else if (fpc & 0x2000) /* overflow */
si.si_code = FPE_FLTOVF;
si_code = FPE_FLTOVF;
else if (fpc & 0x1000) /* underflow */
si.si_code = FPE_FLTUND;
si_code = FPE_FLTUND;
else if (fpc & 0x0800) /* inexact */
si.si_code = FPE_FLTRES;
si_code = FPE_FLTRES;
}
do_trap(pgm_int_code, SIGFPE,
"floating point exception", regs, &si);
do_trap(regs, SIGFPE, si_code, "floating point exception");
}
static void __kprobes illegal_op(struct pt_regs *regs, long pgm_int_code,
unsigned long trans_exc_code)
static void __kprobes illegal_op(struct pt_regs *regs)
{
siginfo_t info;
__u8 opcode[6];
__u16 __user *location;
int signal = 0;
location = get_psw_address(regs, pgm_int_code);
location = get_psw_address(regs);
if (regs->psw.mask & PSW_MASK_PSTATE) {
if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
@ -467,44 +453,31 @@ static void __kprobes illegal_op(struct pt_regs *regs, long pgm_int_code,
* If we get an illegal op in kernel mode, send it through the
* kprobes notifier. If kprobes doesn't pick it up, SIGILL
*/
if (notify_die(DIE_BPT, "bpt", regs, pgm_int_code,
if (notify_die(DIE_BPT, "bpt", regs, 0,
3, SIGTRAP) != NOTIFY_STOP)
signal = SIGILL;
}
#ifdef CONFIG_MATHEMU
if (signal == SIGFPE)
do_fp_trap(regs, location,
current->thread.fp_regs.fpc, pgm_int_code);
else if (signal == SIGSEGV) {
info.si_signo = signal;
info.si_errno = 0;
info.si_code = SEGV_MAPERR;
info.si_addr = (void __user *) location;
do_trap(pgm_int_code, signal,
"user address fault", regs, &info);
} else
do_fp_trap(regs, current->thread.fp_regs.fpc);
else if (signal == SIGSEGV)
do_trap(regs, signal, SEGV_MAPERR, "user address fault");
else
#endif
if (signal) {
info.si_signo = signal;
info.si_errno = 0;
info.si_code = ILL_ILLOPC;
info.si_addr = (void __user *) location;
do_trap(pgm_int_code, signal,
"illegal operation", regs, &info);
}
if (signal)
do_trap(regs, signal, ILL_ILLOPC, "illegal operation");
}
#ifdef CONFIG_MATHEMU
void specification_exception(struct pt_regs *regs, long pgm_int_code,
unsigned long trans_exc_code)
void specification_exception(struct pt_regs *regs)
{
__u8 opcode[6];
__u16 __user *location = NULL;
int signal = 0;
location = (__u16 __user *) get_psw_address(regs, pgm_int_code);
location = (__u16 __user *) get_psw_address(regs);
if (regs->psw.mask & PSW_MASK_PSTATE) {
get_user(*((__u16 *) opcode), location);
@ -539,30 +512,21 @@ void specification_exception(struct pt_regs *regs, long pgm_int_code,
signal = SIGILL;
if (signal == SIGFPE)
do_fp_trap(regs, location,
current->thread.fp_regs.fpc, pgm_int_code);
else if (signal) {
siginfo_t info;
info.si_signo = signal;
info.si_errno = 0;
info.si_code = ILL_ILLOPN;
info.si_addr = location;
do_trap(pgm_int_code, signal,
"specification exception", regs, &info);
}
do_fp_trap(regs, current->thread.fp_regs.fpc);
else if (signal)
do_trap(regs, signal, ILL_ILLOPN, "specification exception");
}
#else
DO_ERROR_INFO(specification_exception, SIGILL, ILL_ILLOPN,
"specification exception");
#endif
static void data_exception(struct pt_regs *regs, long pgm_int_code,
unsigned long trans_exc_code)
static void data_exception(struct pt_regs *regs)
{
__u16 __user *location;
int signal = 0;
location = get_psw_address(regs, pgm_int_code);
location = get_psw_address(regs);
if (MACHINE_HAS_IEEE)
asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
@ -627,32 +591,18 @@ static void data_exception(struct pt_regs *regs, long pgm_int_code,
else
signal = SIGILL;
if (signal == SIGFPE)
do_fp_trap(regs, location,
current->thread.fp_regs.fpc, pgm_int_code);
else if (signal) {
siginfo_t info;
info.si_signo = signal;
info.si_errno = 0;
info.si_code = ILL_ILLOPN;
info.si_addr = location;
do_trap(pgm_int_code, signal, "data exception", regs, &info);
}
do_fp_trap(regs, current->thread.fp_regs.fpc);
else if (signal)
do_trap(regs, signal, ILL_ILLOPN, "data exception");
}
static void space_switch_exception(struct pt_regs *regs, long pgm_int_code,
unsigned long trans_exc_code)
static void space_switch_exception(struct pt_regs *regs)
{
siginfo_t info;
/* Set user psw back to home space mode. */
if (regs->psw.mask & PSW_MASK_PSTATE)
regs->psw.mask |= PSW_ASC_HOME;
/* Send SIGILL. */
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_PRVOPC;
info.si_addr = get_psw_address(regs, pgm_int_code);
do_trap(pgm_int_code, SIGILL, "space switch event", regs, &info);
do_trap(regs, SIGILL, ILL_PRVOPC, "space switch event");
}
void __kprobes kernel_stack_overflow(struct pt_regs * regs)

101
arch/s390/mm/fault.c
View file

@ -125,8 +125,7 @@ static inline int user_space_fault(unsigned long trans_exc_code)
return trans_exc_code != 3;
}
static inline void report_user_fault(struct pt_regs *regs, long int_code,
int signr, unsigned long address)
static inline void report_user_fault(struct pt_regs *regs, long signr)
{
if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
return;
@ -134,10 +133,12 @@ static inline void report_user_fault(struct pt_regs *regs, long int_code,
return;
if (!printk_ratelimit())
return;
printk("User process fault: interruption code 0x%lX ", int_code);
printk(KERN_ALERT "User process fault: interruption code 0x%X ",
regs->int_code);
print_vma_addr(KERN_CONT "in ", regs->psw.addr & PSW_ADDR_INSN);
printk("\n");
printk("failing address: %lX\n", address);
printk(KERN_CONT "\n");
printk(KERN_ALERT "failing address: %lX\n",
regs->int_parm_long & __FAIL_ADDR_MASK);
show_regs(regs);
}
@ -145,24 +146,18 @@ static inline void report_user_fault(struct pt_regs *regs, long int_code,
* Send SIGSEGV to task. This is an external routine
* to keep the stack usage of do_page_fault small.
*/
static noinline void do_sigsegv(struct pt_regs *regs, long int_code,
int si_code, unsigned long trans_exc_code)
static noinline void do_sigsegv(struct pt_regs *regs, int si_code)
{
struct siginfo si;
unsigned long address;
address = trans_exc_code & __FAIL_ADDR_MASK;
current->thread.prot_addr = address;
current->thread.trap_no = int_code;
report_user_fault(regs, int_code, SIGSEGV, address);
report_user_fault(regs, SIGSEGV);
si.si_signo = SIGSEGV;
si.si_code = si_code;
si.si_addr = (void __user *) address;
si.si_addr = (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK);
force_sig_info(SIGSEGV, &si, current);
}
static noinline void do_no_context(struct pt_regs *regs, long int_code,
unsigned long trans_exc_code)
static noinline void do_no_context(struct pt_regs *regs)
{
const struct exception_table_entry *fixup;
unsigned long address;
@ -178,55 +173,48 @@ static noinline void do_no_context(struct pt_regs *regs, long int_code,
* Oops. The kernel tried to access some bad page. We'll have to
* terminate things with extreme prejudice.
*/
address = trans_exc_code & __FAIL_ADDR_MASK;
if (!user_space_fault(trans_exc_code))
address = regs->int_parm_long & __FAIL_ADDR_MASK;
if (!user_space_fault(regs->int_parm_long))
printk(KERN_ALERT "Unable to handle kernel pointer dereference"
" at virtual kernel address %p\n", (void *)address);
else
printk(KERN_ALERT "Unable to handle kernel paging request"
" at virtual user address %p\n", (void *)address);
die("Oops", regs, int_code);
die(regs, "Oops");
do_exit(SIGKILL);
}
static noinline void do_low_address(struct pt_regs *regs, long int_code,
unsigned long trans_exc_code)
static noinline void do_low_address(struct pt_regs *regs)
{
/* Low-address protection hit in kernel mode means
NULL pointer write access in kernel mode. */
if (regs->psw.mask & PSW_MASK_PSTATE) {
/* Low-address protection hit in user mode 'cannot happen'. */
die ("Low-address protection", regs, int_code);
die (regs, "Low-address protection");
do_exit(SIGKILL);
}
do_no_context(regs, int_code, trans_exc_code);
do_no_context(regs);
}
static noinline void do_sigbus(struct pt_regs *regs, long int_code,
unsigned long trans_exc_code)
static noinline void do_sigbus(struct pt_regs *regs)
{
struct task_struct *tsk = current;
unsigned long address;
struct siginfo si;
/*
* Send a sigbus, regardless of whether we were in kernel
* or user mode.
*/
address = trans_exc_code & __FAIL_ADDR_MASK;
tsk->thread.prot_addr = address;
tsk->thread.trap_no = int_code;
si.si_signo = SIGBUS;
si.si_errno = 0;
si.si_code = BUS_ADRERR;
si.si_addr = (void __user *) address;
si.si_addr = (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK);
force_sig_info(SIGBUS, &si, tsk);
}
static noinline void do_fault_error(struct pt_regs *regs, long int_code,
unsigned long trans_exc_code, int fault)
static noinline void do_fault_error(struct pt_regs *regs, int fault)
{
int si_code;
@ -238,24 +226,24 @@ static noinline void do_fault_error(struct pt_regs *regs, long int_code,
/* User mode accesses just cause a SIGSEGV */
si_code = (fault == VM_FAULT_BADMAP) ?
SEGV_MAPERR : SEGV_ACCERR;
do_sigsegv(regs, int_code, si_code, trans_exc_code);
do_sigsegv(regs, si_code);
return;
}
case VM_FAULT_BADCONTEXT:
do_no_context(regs, int_code, trans_exc_code);
do_no_context(regs);
break;
default: /* fault & VM_FAULT_ERROR */
if (fault & VM_FAULT_OOM) {
if (!(regs->psw.mask & PSW_MASK_PSTATE))
do_no_context(regs, int_code, trans_exc_code);
do_no_context(regs);
else
pagefault_out_of_memory();
} else if (fault & VM_FAULT_SIGBUS) {
/* Kernel mode? Handle exceptions or die */
if (!(regs->psw.mask & PSW_MASK_PSTATE))
do_no_context(regs, int_code, trans_exc_code);
do_no_context(regs);
else
do_sigbus(regs, int_code, trans_exc_code);
do_sigbus(regs);
} else
BUG();
break;
@ -273,12 +261,12 @@ static noinline void do_fault_error(struct pt_regs *regs, long int_code,
* 11 Page translation -> Not present (nullification)
* 3b Region third trans. -> Not present (nullification)
*/
static inline int do_exception(struct pt_regs *regs, int access,
unsigned long trans_exc_code)
static inline int do_exception(struct pt_regs *regs, int access)
{
struct task_struct *tsk;
struct mm_struct *mm;
struct vm_area_struct *vma;
unsigned long trans_exc_code;
unsigned long address;
unsigned int flags;
int fault;
@ -288,6 +276,7 @@ static inline int do_exception(struct pt_regs *regs, int access,
tsk = current;
mm = tsk->mm;
trans_exc_code = regs->int_parm_long;
/*
* Verify that the fault happened in user space, that
@ -387,45 +376,46 @@ static inline int do_exception(struct pt_regs *regs, int access,
return fault;
}
void __kprobes do_protection_exception(struct pt_regs *regs, long pgm_int_code,
unsigned long trans_exc_code)
void __kprobes do_protection_exception(struct pt_regs *regs)
{
unsigned long trans_exc_code;
int fault;
trans_exc_code = regs->int_parm_long;
/* Protection exception is suppressing, decrement psw address. */
regs->psw.addr = __rewind_psw(regs->psw, pgm_int_code >> 16);
regs->psw.addr = __rewind_psw(regs->psw, regs->int_code >> 16);
/*
* Check for low-address protection. This needs to be treated
* as a special case because the translation exception code
* field is not guaranteed to contain valid data in this case.
*/
if (unlikely(!(trans_exc_code & 4))) {
do_low_address(regs, pgm_int_code, trans_exc_code);
do_low_address(regs);
return;
}
fault = do_exception(regs, VM_WRITE, trans_exc_code);
fault = do_exception(regs, VM_WRITE);
if (unlikely(fault))
do_fault_error(regs, 4, trans_exc_code, fault);
do_fault_error(regs, fault);
}
void __kprobes do_dat_exception(struct pt_regs *regs, long pgm_int_code,
unsigned long trans_exc_code)
void __kprobes do_dat_exception(struct pt_regs *regs)
{
int access, fault;
access = VM_READ | VM_EXEC | VM_WRITE;
fault = do_exception(regs, access, trans_exc_code);
fault = do_exception(regs, access);
if (unlikely(fault))
do_fault_error(regs, pgm_int_code & 255, trans_exc_code, fault);
do_fault_error(regs, fault);
}
#ifdef CONFIG_64BIT
void __kprobes do_asce_exception(struct pt_regs *regs, long pgm_int_code,
unsigned long trans_exc_code)
void __kprobes do_asce_exception(struct pt_regs *regs)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
unsigned long trans_exc_code;
trans_exc_code = regs->int_parm_long;
if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
goto no_context;
@ -440,12 +430,12 @@ void __kprobes do_asce_exception(struct pt_regs *regs, long pgm_int_code,
/* User mode accesses just cause a SIGSEGV */
if (regs->psw.mask & PSW_MASK_PSTATE) {
do_sigsegv(regs, pgm_int_code, SEGV_MAPERR, trans_exc_code);
do_sigsegv(regs, SEGV_MAPERR);
return;
}
no_context:
do_no_context(regs, pgm_int_code, trans_exc_code);
do_no_context(regs);
}
#endif
@ -459,14 +449,15 @@ int __handle_fault(unsigned long uaddr, unsigned long pgm_int_code, int write)
regs.psw.mask |= PSW_MASK_IO | PSW_MASK_EXT;
regs.psw.addr = (unsigned long) __builtin_return_address(0);
regs.psw.addr |= PSW_ADDR_AMODE;
uaddr &= PAGE_MASK;
regs.int_code = pgm_int_code;
regs.int_parm_long = (uaddr & PAGE_MASK) | 2;
access = write ? VM_WRITE : VM_READ;
fault = do_exception(&regs, access, uaddr | 2);
fault = do_exception(&regs, access);
if (unlikely(fault)) {
if (fault & VM_FAULT_OOM)
return -EFAULT;
else if (fault & VM_FAULT_SIGBUS)
do_sigbus(&regs, pgm_int_code, uaddr);
do_sigbus(&regs);
}
return fault ? -EFAULT : 0;
}