mm_segment_t mm_segment;
unsigned long prot_addr; /* address of protection-excep. */
unsigned int trap_no;
- per_struct per_info;
+ struct per_regs per_user; /* User specified PER registers */
+ struct per_event per_event; /* Cause of the last PER trap */
/* pfault_wait is used to block the process on a pfault event */
unsigned long pfault_wait;
};
unsigned short ilc;
unsigned short svcnr;
};
+
+/*
+ * Program event recording (PER) register set.
+ */
+struct per_regs {
+ unsigned long control; /* PER control bits */
+ unsigned long start; /* PER starting address */
+ unsigned long end; /* PER ending address */
+};
+
+/*
+ * PER event contains information about the cause of the last PER exception.
+ */
+struct per_event {
+ unsigned short cause; /* PER code, ATMID and AI */
+ unsigned long address; /* PER address */
+ unsigned char paid; /* PER access identification */
+};
+
+/*
+ * Simplified per_info structure used to decode the ptrace user space ABI.
+ */
+struct per_struct_kernel {
+ unsigned long cr9; /* PER control bits */
+ unsigned long cr10; /* PER starting address */
+ unsigned long cr11; /* PER ending address */
+ unsigned long bits; /* Obsolete software bits */
+ unsigned long starting_addr; /* User specified start address */
+ unsigned long ending_addr; /* User specified end address */
+ unsigned short perc_atmid; /* PER trap ATMID */
+ unsigned long address; /* PER trap instruction address */
+ unsigned char access_id; /* PER trap access identification */
+};
+
+#define PER_EVENT_MASK 0xE9000000UL
+
+#define PER_EVENT_BRANCH 0x80000000UL
+#define PER_EVENT_IFETCH 0x40000000UL
+#define PER_EVENT_STORE 0x20000000UL
+#define PER_EVENT_STORE_REAL 0x08000000UL
+#define PER_EVENT_NULLIFICATION 0x01000000UL
+
+#define PER_CONTROL_MASK 0x00a00000UL
+
+#define PER_CONTROL_BRANCH_ADDRESS 0x00800000UL
+#define PER_CONTROL_ALTERATION 0x00200000UL
+
#endif
/*
- * Now for the program event recording (trace) definitions.
+ * Now for the user space program event recording (trace) definitions.
+ * The following structures are used only for the ptrace interface, don't
+ * touch or even look at it if you don't want to modify the user-space
+ * ptrace interface. In particular stay away from it for in-kernel PER.
*/
typedef struct
{
struct task_struct;
extern struct task_struct *__switch_to(void *, void *);
+extern void update_per_regs(struct task_struct *task);
static inline void save_fp_regs(s390_fp_regs *fpregs)
{
if (next->mm) { \
restore_fp_regs(&next->thread.fp_regs); \
restore_access_regs(&next->thread.acrs[0]); \
+ update_per_regs(next); \
} \
prev = __switch_to(prev,next); \
} while (0)
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_RESTART_SVC 4 /* restart svc with new svc number */
-#define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */
+#define TIF_PER_TRAP 6 /* deliver sigtrap on return to user */
#define TIF_MCCK_PENDING 7 /* machine check handling is pending */
#define TIF_SYSCALL_TRACE 8 /* syscall trace active */
#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
#define TIF_31BIT 17 /* 32bit process */
#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK 19 /* restore signal mask in do_signal() */
-#define TIF_FREEZE 20 /* thread is freezing for suspend */
+#define TIF_SINGLE_STEP 20 /* This task is single stepped */
+#define TIF_FREEZE 21 /* thread is freezing for suspend */
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC)
-#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
+#define _TIF_PER_TRAP (1<<TIF_PER_TRAP)
#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_31BIT (1<<TIF_31BIT)
+#define _TIF_SINGLE_STEP (1<<TIF_FREEZE)
#define _TIF_FREEZE (1<<TIF_FREEZE)
#endif /* __KERNEL__ */
{
DEFINE(__THREAD_info, offsetof(struct task_struct, stack));
DEFINE(__THREAD_ksp, offsetof(struct task_struct, thread.ksp));
- DEFINE(__THREAD_per, offsetof(struct task_struct, thread.per_info));
DEFINE(__THREAD_mm_segment, offsetof(struct task_struct, thread.mm_segment));
BLANK();
DEFINE(__TASK_pid, offsetof(struct task_struct, pid));
BLANK();
- DEFINE(__PER_atmid, offsetof(per_struct, lowcore.words.perc_atmid));
- DEFINE(__PER_address, offsetof(per_struct, lowcore.words.address));
- DEFINE(__PER_access_id, offsetof(per_struct, lowcore.words.access_id));
+ DEFINE(__THREAD_per_cause,
+ offsetof(struct task_struct, thread.per_event.cause));
+ DEFINE(__THREAD_per_address,
+ offsetof(struct task_struct, thread.per_event.address));
+ DEFINE(__THREAD_per_paid,
+ offsetof(struct task_struct, thread.per_event.paid));
BLANK();
DEFINE(__TI_task, offsetof(struct thread_info, task));
DEFINE(__TI_domain, offsetof(struct thread_info, exec_domain));
DEFINE(__LC_PGM_ILC, offsetof(struct _lowcore, pgm_ilc));
DEFINE(__LC_PGM_INT_CODE, offsetof(struct _lowcore, pgm_code));
DEFINE(__LC_TRANS_EXC_CODE, offsetof(struct _lowcore, trans_exc_code));
- DEFINE(__LC_PER_ATMID, offsetof(struct _lowcore, per_perc_atmid));
+ DEFINE(__LC_PER_CAUSE, offsetof(struct _lowcore, per_perc_atmid));
DEFINE(__LC_PER_ADDRESS, offsetof(struct _lowcore, per_address));
- DEFINE(__LC_PER_ACCESS_ID, offsetof(struct _lowcore, per_access_id));
+ DEFINE(__LC_PER_PAID, offsetof(struct _lowcore, per_access_id));
DEFINE(__LC_AR_MODE_ID, offsetof(struct _lowcore, ar_access_id));
DEFINE(__LC_SUBCHANNEL_ID, offsetof(struct _lowcore, subchannel_id));
DEFINE(__LC_SUBCHANNEL_NR, offsetof(struct _lowcore, subchannel_nr));
#include <asm/ptrace.h> /* needed for NUM_CR_WORDS */
#include "compat_linux.h" /* needed for psw_compat_t */
-typedef struct {
- __u32 cr[NUM_CR_WORDS];
-} per_cr_words32;
-
-typedef struct {
- __u16 perc_atmid; /* 0x096 */
- __u32 address; /* 0x098 */
- __u8 access_id; /* 0x0a1 */
-} per_lowcore_words32;
-
-typedef struct {
- union {
- per_cr_words32 words;
- } control_regs;
- /*
- * Use these flags instead of setting em_instruction_fetch
- * directly they are used so that single stepping can be
- * switched on & off while not affecting other tracing
- */
- unsigned single_step : 1;
- unsigned instruction_fetch : 1;
- unsigned : 30;
- /*
- * These addresses are copied into cr10 & cr11 if single
- * stepping is switched off
- */
- __u32 starting_addr;
- __u32 ending_addr;
- union {
- per_lowcore_words32 words;
- } lowcore;
-} per_struct32;
+struct compat_per_struct_kernel {
+ __u32 cr9; /* PER control bits */
+ __u32 cr10; /* PER starting address */
+ __u32 cr11; /* PER ending address */
+ __u32 bits; /* Obsolete software bits */
+ __u32 starting_addr; /* User specified start address */
+ __u32 ending_addr; /* User specified end address */
+ __u16 perc_atmid; /* PER trap ATMID */
+ __u32 address; /* PER trap instruction address */
+ __u8 access_id; /* PER trap access identification */
+};
-struct user_regs_struct32
+struct compat_user_regs_struct
{
psw_compat_t psw;
u32 gprs[NUM_GPRS];
* itself as there is no "official" ptrace interface for hardware
* watchpoints. This is the way intel does it.
*/
- per_struct32 per_info;
+ struct compat_per_struct_kernel per_info;
u32 ieee_instruction_pointer; /* obsolete, always 0 */
};
-struct user32 {
+struct compat_user {
/* We start with the registers, to mimic the way that "memory"
is returned from the ptrace(3,...) function. */
- struct user_regs_struct32 regs; /* Where the registers are actually stored */
+ struct compat_user_regs_struct regs;
/* The rest of this junk is to help gdb figure out what goes where */
u32 u_tsize; /* Text segment size (pages). */
u32 u_dsize; /* Data segment size (pages). */
__u32 len;
__u32 kernel_addr;
__u32 process_addr;
-} ptrace_area_emu31;
+} compat_ptrace_area;
#endif /* _PTRACE32_H */
SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE
_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
- _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
+ _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_PER_TRAP )
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
_TIF_MCCK_PENDING)
_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
.globl __switch_to
__switch_to:
basr %r1,0
-__switch_to_base:
- tm __THREAD_per(%r3),0xe8 # new process is using per ?
- bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine
- stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff
- clc __THREAD_per(12,%r3),__SF_EMPTY(%r15)
- be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's
- lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't
-__switch_to_noper:
- l %r4,__THREAD_info(%r2) # get thread_info of prev
+0: l %r4,__THREAD_info(%r2) # get thread_info of prev
+ l %r5,__THREAD_info(%r3) # get thread_info of next
tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
- bz __switch_to_no_mcck-__switch_to_base(%r1)
- ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
- l %r4,__THREAD_info(%r3) # get thread_info of next
- oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next
-__switch_to_no_mcck:
- stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
- st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
- l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
- lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
- st %r3,__LC_CURRENT # __LC_CURRENT = current task struct
- lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
- l %r3,__THREAD_info(%r3) # load thread_info from task struct
- st %r3,__LC_THREAD_INFO
- ahi %r3,STACK_SIZE
- st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
+ bz 1f-0b(%r1)
+ ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
+ oi __TI_flags+3(%r5),_TIF_MCCK_PENDING # set it in next
+1: stm %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
+ st %r15,__THREAD_ksp(%r2) # store kernel stack of prev
+ l %r15,__THREAD_ksp(%r3) # load kernel stack of next
+ lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
+ lm %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
+ st %r3,__LC_CURRENT # store task struct of next
+ st %r5,__LC_THREAD_INFO # store thread info of next
+ ahi %r5,STACK_SIZE # end of kernel stack of next
+ st %r5,__LC_KERNEL_STACK # store end of kernel stack
br %r14
__critical_start:
bo BASED(sysc_notify_resume)
tm __TI_flags+3(%r12),_TIF_RESTART_SVC
bo BASED(sysc_restart)
- tm __TI_flags+3(%r12),_TIF_SINGLE_STEP
+ tm __TI_flags+3(%r12),_TIF_PER_TRAP
bo BASED(sysc_singlestep)
b BASED(sysc_return) # beware of critical section cleanup
# _TIF_SIGPENDING is set, call do_signal
#
sysc_sigpending:
- ni __TI_flags+3(%r12),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
+ ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP
la %r2,SP_PTREGS(%r15) # load pt_regs
l %r1,BASED(.Ldo_signal)
basr %r14,%r1 # call do_signal
tm __TI_flags+3(%r12),_TIF_RESTART_SVC
bo BASED(sysc_restart)
- tm __TI_flags+3(%r12),_TIF_SINGLE_STEP
+ tm __TI_flags+3(%r12),_TIF_PER_TRAP
bo BASED(sysc_singlestep)
b BASED(sysc_return)
b BASED(sysc_nr_ok) # restart svc
#
-# _TIF_SINGLE_STEP is set, call do_single_step
+# _TIF_PER_TRAP is set, call do_per_trap
#
sysc_singlestep:
- ni __TI_flags+3(%r12),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
+ ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP
xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) # clear svc number
la %r2,SP_PTREGS(%r15) # address of register-save area
l %r1,BASED(.Lhandle_per) # load adr. of per handler
la %r14,BASED(sysc_return) # load adr. of system return
- br %r1 # branch to do_single_step
+ br %r1 # branch to do_per_trap
#
# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
l %r1,__TI_task(%r12)
tm SP_PSW+1(%r15),0x01 # kernel per event ?
bz BASED(kernel_per)
- mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
- mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
- mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
- oi __TI_flags+3(%r12),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
+ mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE
+ mvc __THREAD_per_address(4,%r1),__LC_PER_ADDRESS
+ mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID
+ oi __TI_flags+3(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP
l %r3,__LC_PGM_ILC # load program interruption code
l %r4,__LC_TRANS_EXC_CODE
REENABLE_IRQS
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
l %r8,__TI_task(%r12)
- mvc __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID
- mvc __THREAD_per+__PER_address(4,%r8),__LC_PER_ADDRESS
- mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID
- oi __TI_flags+3(%r12),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
+ mvc __THREAD_per_cause(2,%r8),__LC_PER_CAUSE
+ mvc __THREAD_per_address(4,%r8),__LC_PER_ADDRESS
+ mvc __THREAD_per_paid(1,%r8),__LC_PER_PAID
+ oi __TI_flags+3(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
lm %r2,%r6,SP_R2(%r15) # load svc arguments
b BASED(sysc_do_svc)
.Ldo_signal: .long do_signal
.Ldo_notify_resume:
.long do_notify_resume
-.Lhandle_per: .long do_single_step
+.Lhandle_per: .long do_per_trap
.Ldo_execve: .long do_execve
.Lexecve_tail: .long execve_tail
.Ljump_table: .long pgm_check_table
extern int sysctl_userprocess_debug;
-void do_single_step(struct pt_regs *regs);
+void do_per_trap(struct pt_regs *regs);
void syscall_trace(struct pt_regs *regs, int entryexit);
void kernel_stack_overflow(struct pt_regs * regs);
void do_signal(struct pt_regs *regs);
STACK_SIZE = 1 << STACK_SHIFT
_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
- _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
+ _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_PER_TRAP )
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
_TIF_MCCK_PENDING)
_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
*/
.globl __switch_to
__switch_to:
- tm __THREAD_per+4(%r3),0xe8 # is the new process using per ?
- jz __switch_to_noper # if not we're fine
- stctg %c9,%c11,__SF_EMPTY(%r15)# We are using per stuff
- clc __THREAD_per(24,%r3),__SF_EMPTY(%r15)
- je __switch_to_noper # we got away without bashing TLB's
- lctlg %c9,%c11,__THREAD_per(%r3) # Nope we didn't
-__switch_to_noper:
- lg %r4,__THREAD_info(%r2) # get thread_info of prev
+ lg %r4,__THREAD_info(%r2) # get thread_info of prev
+ lg %r5,__THREAD_info(%r3) # get thread_info of next
tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
- jz __switch_to_no_mcck
- ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
- lg %r4,__THREAD_info(%r3) # get thread_info of next
- oi __TI_flags+7(%r4),_TIF_MCCK_PENDING # set it in next
-__switch_to_no_mcck:
- stmg %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
- stg %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
- lg %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
- lmg %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
- stg %r3,__LC_CURRENT # __LC_CURRENT = current task struct
- lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
- lg %r3,__THREAD_info(%r3) # load thread_info from task struct
- stg %r3,__LC_THREAD_INFO
- aghi %r3,STACK_SIZE
- stg %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
+ jz 0f
+ ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
+ oi __TI_flags+7(%r5),_TIF_MCCK_PENDING # set it in next
+0: stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
+ stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev
+ lg %r15,__THREAD_ksp(%r3) # load kernel stack of next
+ lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
+ lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
+ stg %r3,__LC_CURRENT # store task struct of next
+ stg %r5,__LC_THREAD_INFO # store thread info of next
+ aghi %r5,STACK_SIZE # end of kernel stack of next
+ stg %r5,__LC_KERNEL_STACK # store end of kernel stack
br %r14
__critical_start:
jo sysc_notify_resume
tm __TI_flags+7(%r12),_TIF_RESTART_SVC
jo sysc_restart
- tm __TI_flags+7(%r12),_TIF_SINGLE_STEP
+ tm __TI_flags+7(%r12),_TIF_PER_TRAP
jo sysc_singlestep
j sysc_return # beware of critical section cleanup
# _TIF_SIGPENDING is set, call do_signal
#
sysc_sigpending:
- ni __TI_flags+7(%r12),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
+ ni __TI_flags+7(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP
la %r2,SP_PTREGS(%r15) # load pt_regs
brasl %r14,do_signal # call do_signal
tm __TI_flags+7(%r12),_TIF_RESTART_SVC
jo sysc_restart
- tm __TI_flags+7(%r12),_TIF_SINGLE_STEP
+ tm __TI_flags+7(%r12),_TIF_PER_TRAP
jo sysc_singlestep
j sysc_return
j sysc_nr_ok # restart svc
#
-# _TIF_SINGLE_STEP is set, call do_single_step
+# _TIF_PER_TRAP is set, call do_per_trap
#
sysc_singlestep:
- ni __TI_flags+7(%r12),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
+ ni __TI_flags+7(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP
xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) # clear svc number
la %r2,SP_PTREGS(%r15) # address of register-save area
larl %r14,sysc_return # load adr. of system return
- jg do_single_step # branch to do_sigtrap
+ jg do_per_trap
#
# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
lg %r1,__TI_task(%r12)
tm SP_PSW+1(%r15),0x01 # kernel per event ?
jz kernel_per
- mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
- mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
- mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
- oi __TI_flags+7(%r12),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
+ mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE
+ mvc __THREAD_per_address(8,%r1),__LC_PER_ADDRESS
+ mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID
+ oi __TI_flags+7(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP
lgf %r3,__LC_PGM_ILC # load program interruption code
lg %r4,__LC_TRANS_EXC_CODE
REENABLE_IRQS
mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
LAST_BREAK
lg %r8,__TI_task(%r12)
- mvc __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID
- mvc __THREAD_per+__PER_address(8,%r8),__LC_PER_ADDRESS
- mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID
- oi __TI_flags+7(%r12),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
+ mvc __THREAD_per_cause(2,%r8),__LC_PER_CAUSE
+ mvc __THREAD_per_address(8,%r8),__LC_PER_ADDRESS
+ mvc __THREAD_per_paid(1,%r8),__LC_PER_PAID
+ oi __TI_flags+7(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
lmg %r2,%r6,SP_R2(%r15) # load svc arguments
j sysc_do_svc
REENABLE_IRQS
xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) # clear svc number
la %r2,SP_PTREGS(%r15) # address of register-save area
- brasl %r14,do_single_step
+ brasl %r14,do_per_trap
j pgm_exit
/*
struct pt_regs *regs,
unsigned long ip)
{
- per_cr_bits kprobe_per_regs[1];
+ struct per_regs per_kprobe;
- /* Set up the per control reg info, will pass to lctl */
- memset(kprobe_per_regs, 0, sizeof(per_cr_bits));
- kprobe_per_regs[0].em_instruction_fetch = 1;
- kprobe_per_regs[0].starting_addr = ip;
- kprobe_per_regs[0].ending_addr = ip;
+ /* Set up the PER control registers %cr9-%cr11 */
+ per_kprobe.control = PER_EVENT_IFETCH;
+ per_kprobe.start = ip;
+ per_kprobe.end = ip;
/* Save control regs and psw mask */
__ctl_store(kcb->kprobe_saved_ctl, 9, 11);
(PSW_MASK_PER | PSW_MASK_IO | PSW_MASK_EXT);
/* Set PER control regs, turns on single step for the given address */
- __ctl_load(kprobe_per_regs, 9, 11);
+ __ctl_load(per_kprobe, 9, 11);
regs->psw.mask |= PSW_MASK_PER;
regs->psw.mask &= ~(PSW_MASK_IO | PSW_MASK_EXT);
regs->psw.addr = ip | PSW_ADDR_AMODE;
/* start new process with ar4 pointing to the correct address space */
p->thread.mm_segment = get_fs();
/* Don't copy debug registers */
- memset(&p->thread.per_info, 0, sizeof(p->thread.per_info));
+ memset(&p->thread.per_user, 0, sizeof(p->thread.per_user));
+ memset(&p->thread.per_event, 0, sizeof(p->thread.per_event));
clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
+ clear_tsk_thread_flag(p, TIF_PER_TRAP);
/* Initialize per thread user and system timer values */
ti = task_thread_info(p);
ti->user_timer = 0;
/*
- * arch/s390/kernel/ptrace.c
+ * Ptrace user space interface.
*
- * S390 version
- * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
+ * Copyright IBM Corp. 1999,2010
+ * Author(s): Denis Joseph Barrow
* Martin Schwidefsky (schwidefsky@de.ibm.com)
- *
- * Based on PowerPC version
- * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
- *
- * Derived from "arch/m68k/kernel/ptrace.c"
- * Copyright (C) 1994 by Hamish Macdonald
- * Taken from linux/kernel/ptrace.c and modified for M680x0.
- * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
- *
- * Modified by Cort Dougan (cort@cs.nmt.edu)
- *
- *
- * This file is subject to the terms and conditions of the GNU General
- * Public License. See the file README.legal in the main directory of
- * this archive for more details.
*/
#include <linux/kernel.h>
REGSET_GENERAL_EXTENDED,
};
-static void
-FixPerRegisters(struct task_struct *task)
+void update_per_regs(struct task_struct *task)
{
- struct pt_regs *regs;
- per_struct *per_info;
- per_cr_words cr_words;
-
- regs = task_pt_regs(task);
- per_info = (per_struct *) &task->thread.per_info;
- per_info->control_regs.bits.em_instruction_fetch =
- per_info->single_step | per_info->instruction_fetch;
-
- if (per_info->single_step) {
- per_info->control_regs.bits.starting_addr = 0;
-#ifdef CONFIG_COMPAT
- if (is_compat_task())
- per_info->control_regs.bits.ending_addr = 0x7fffffffUL;
- else
-#endif
- per_info->control_regs.bits.ending_addr = PSW_ADDR_INSN;
- } else {
- per_info->control_regs.bits.starting_addr =
- per_info->starting_addr;
- per_info->control_regs.bits.ending_addr =
- per_info->ending_addr;
- }
- /*
- * if any of the control reg tracing bits are on
- * we switch on per in the psw
- */
- if (per_info->control_regs.words.cr[0] & PER_EM_MASK)
- regs->psw.mask |= PSW_MASK_PER;
- else
+ static const struct per_regs per_single_step = {
+ .control = PER_EVENT_IFETCH,
+ .start = 0,
+ .end = PSW_ADDR_INSN,
+ };
+ struct pt_regs *regs = task_pt_regs(task);
+ struct thread_struct *thread = &task->thread;
+ const struct per_regs *new;
+ struct per_regs old;
+
+ /* TIF_SINGLE_STEP overrides the user specified PER registers. */
+ new = test_tsk_thread_flag(task, TIF_SINGLE_STEP) ?
+ &per_single_step : &thread->per_user;
+
+ /* Take care of the PER enablement bit in the PSW. */
+ if (!(new->control & PER_EVENT_MASK)) {
regs->psw.mask &= ~PSW_MASK_PER;
-
- if (per_info->control_regs.bits.em_storage_alteration)
- per_info->control_regs.bits.storage_alt_space_ctl = 1;
- else
- per_info->control_regs.bits.storage_alt_space_ctl = 0;
-
- if (task == current) {
- __ctl_store(cr_words, 9, 11);
- if (memcmp(&cr_words, &per_info->control_regs.words,
- sizeof(cr_words)) != 0)
- __ctl_load(per_info->control_regs.words, 9, 11);
+ return;
}
+ regs->psw.mask |= PSW_MASK_PER;
+ __ctl_store(old, 9, 11);
+ if (memcmp(new, &old, sizeof(struct per_regs)) != 0)
+ __ctl_load(*new, 9, 11);
}
void user_enable_single_step(struct task_struct *task)
{
- task->thread.per_info.single_step = 1;
- FixPerRegisters(task);
+ set_tsk_thread_flag(task, TIF_SINGLE_STEP);
+ if (task == current)
+ update_per_regs(task);
}
void user_disable_single_step(struct task_struct *task)
{
- task->thread.per_info.single_step = 0;
- FixPerRegisters(task);
+ clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
+ if (task == current)
+ update_per_regs(task);
}
/*
* Called by kernel/ptrace.c when detaching..
*
- * Make sure single step bits etc are not set.
+ * Clear all debugging related fields.
*/
-void
-ptrace_disable(struct task_struct *child)
+void ptrace_disable(struct task_struct *task)
{
- /* make sure the single step bit is not set. */
- user_disable_single_step(child);
+ memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
+ memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
+ clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
+ clear_tsk_thread_flag(task, TIF_PER_TRAP);
}
#ifndef CONFIG_64BIT
# define __ADDR_MASK 7
#endif
+static inline unsigned long __peek_user_per(struct task_struct *child,
+ addr_t addr)
+{
+ struct per_struct_kernel *dummy = NULL;
+
+ if (addr == (addr_t) &dummy->cr9)
+ /* Control bits of the active per set. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ PER_EVENT_IFETCH : child->thread.per_user.control;
+ else if (addr == (addr_t) &dummy->cr10)
+ /* Start address of the active per set. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ 0 : child->thread.per_user.start;
+ else if (addr == (addr_t) &dummy->cr11)
+ /* End address of the active per set. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ PSW_ADDR_INSN : child->thread.per_user.end;
+ else if (addr == (addr_t) &dummy->bits)
+ /* Single-step bit. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ (1UL << (BITS_PER_LONG - 1)) : 0;
+ else if (addr == (addr_t) &dummy->starting_addr)
+ /* Start address of the user specified per set. */
+ return child->thread.per_user.start;
+ else if (addr == (addr_t) &dummy->ending_addr)
+ /* End address of the user specified per set. */
+ return child->thread.per_user.end;
+ else if (addr == (addr_t) &dummy->perc_atmid)
+ /* PER code, ATMID and AI of the last PER trap */
+ return (unsigned long)
+ child->thread.per_event.cause << (BITS_PER_LONG - 16);
+ else if (addr == (addr_t) &dummy->address)
+ /* Address of the last PER trap */
+ return child->thread.per_event.address;
+ else if (addr == (addr_t) &dummy->access_id)
+ /* Access id of the last PER trap */
+ return (unsigned long)
+ child->thread.per_event.paid << (BITS_PER_LONG - 8);
+ return 0;
+}
+
/*
* Read the word at offset addr from the user area of a process. The
* trouble here is that the information is littered over different
} else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
/*
- * per_info is found in the thread structure
+ * Handle access to the per_info structure.
*/
- offset = addr - (addr_t) &dummy->regs.per_info;
- tmp = *(addr_t *)((addr_t) &child->thread.per_info + offset);
+ addr -= (addr_t) &dummy->regs.per_info;
+ tmp = __peek_user_per(child, addr);
} else
tmp = 0;
return put_user(tmp, (addr_t __user *) data);
}
+static inline void __poke_user_per(struct task_struct *child,
+ addr_t addr, addr_t data)
+{
+ struct per_struct_kernel *dummy = NULL;
+
+ /*
+ * There are only three fields in the per_info struct that the
+ * debugger user can write to.
+ * 1) cr9: the debugger wants to set a new PER event mask
+ * 2) starting_addr: the debugger wants to set a new starting
+ * address to use with the PER event mask.
+ * 3) ending_addr: the debugger wants to set a new ending
+ * address to use with the PER event mask.
+ * The user specified PER event mask and the start and end
+ * addresses are used only if single stepping is not in effect.
+ * Writes to any other field in per_info are ignored.
+ */
+ if (addr == (addr_t) &dummy->cr9)
+ /* PER event mask of the user specified per set. */
+ child->thread.per_user.control =
+ data & (PER_EVENT_MASK | PER_CONTROL_MASK);
+ else if (addr == (addr_t) &dummy->starting_addr)
+ /* Starting address of the user specified per set. */
+ child->thread.per_user.start = data;
+ else if (addr == (addr_t) &dummy->ending_addr)
+ /* Ending address of the user specified per set. */
+ child->thread.per_user.end = data;
+}
+
/*
* Write a word to the user area of a process at location addr. This
* operation does have an additional problem compared to peek_user.
} else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
/*
- * per_info is found in the thread structure
+ * Handle access to the per_info structure.
*/
- offset = addr - (addr_t) &dummy->regs.per_info;
- *(addr_t *)((addr_t) &child->thread.per_info + offset) = data;
+ addr -= (addr_t) &dummy->regs.per_info;
+ __poke_user_per(child, addr, data);
}
- FixPerRegisters(child);
return 0;
}
-static int
-poke_user(struct task_struct *child, addr_t addr, addr_t data)
+static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
{
addr_t mask;
* a 64 bit program is a no-no.
*/
+/*
+ * Same as peek_user_per but for a 31 bit program.
+ */
+static inline __u32 __peek_user_per_compat(struct task_struct *child,
+ addr_t addr)
+{
+ struct compat_per_struct_kernel *dummy32 = NULL;
+
+ if (addr == (addr_t) &dummy32->cr9)
+ /* Control bits of the active per set. */
+ return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
+ PER_EVENT_IFETCH : child->thread.per_user.control;
+ else if (addr == (addr_t) &dummy32->cr10)
+ /* Start address of the active per set. */
+ return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
+ 0 : child->thread.per_user.start;
+ else if (addr == (addr_t) &dummy32->cr11)
+ /* End address of the active per set. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ PSW32_ADDR_INSN : child->thread.per_user.end;
+ else if (addr == (addr_t) &dummy32->bits)
+ /* Single-step bit. */
+ return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
+ 0x80000000 : 0;
+ else if (addr == (addr_t) &dummy32->starting_addr)
+ /* Start address of the user specified per set. */
+ return (__u32) child->thread.per_user.start;
+ else if (addr == (addr_t) &dummy32->ending_addr)
+ /* End address of the user specified per set. */
+ return (__u32) child->thread.per_user.end;
+ else if (addr == (addr_t) &dummy32->perc_atmid)
+ /* PER code, ATMID and AI of the last PER trap */
+ return (__u32) child->thread.per_event.cause << 16;
+ else if (addr == (addr_t) &dummy32->address)
+ /* Address of the last PER trap */
+ return (__u32) child->thread.per_event.address;
+ else if (addr == (addr_t) &dummy32->access_id)
+ /* Access id of the last PER trap */
+ return (__u32) child->thread.per_event.paid << 24;
+ return 0;
+}
+
/*
* Same as peek_user but for a 31 bit program.
*/
static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
{
- struct user32 *dummy32 = NULL;
- per_struct32 *dummy_per32 = NULL;
+ struct compat_user *dummy32 = NULL;
addr_t offset;
__u32 tmp;
} else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
/*
- * per_info is found in the thread structure
+ * Handle access to the per_info structure.
*/
- offset = addr - (addr_t) &dummy32->regs.per_info;
- /* This is magic. See per_struct and per_struct32. */
- if ((offset >= (addr_t) &dummy_per32->control_regs &&
- offset < (addr_t) (&dummy_per32->control_regs + 1)) ||
- (offset >= (addr_t) &dummy_per32->starting_addr &&
- offset <= (addr_t) &dummy_per32->ending_addr) ||
- offset == (addr_t) &dummy_per32->lowcore.words.address)
- offset = offset*2 + 4;
- else
- offset = offset*2;
- tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset);
+ addr -= (addr_t) &dummy32->regs.per_info;
+ tmp = __peek_user_per_compat(child, addr);
} else
tmp = 0;
return put_user(tmp, (__u32 __user *) data);
}
+/*
+ * Same as poke_user_per but for a 31 bit program.
+ */
+static inline void __poke_user_per_compat(struct task_struct *child,
+ addr_t addr, __u32 data)
+{
+ struct compat_per_struct_kernel *dummy32 = NULL;
+
+ if (addr == (addr_t) &dummy32->cr9)
+ /* PER event mask of the user specified per set. */
+ child->thread.per_user.control =
+ data & (PER_EVENT_MASK | PER_CONTROL_MASK);
+ else if (addr == (addr_t) &dummy32->starting_addr)
+ /* Starting address of the user specified per set. */
+ child->thread.per_user.start = data;
+ else if (addr == (addr_t) &dummy32->ending_addr)
+ /* Ending address of the user specified per set. */
+ child->thread.per_user.end = data;
+}
+
/*
* Same as poke_user but for a 31 bit program.
*/
static int __poke_user_compat(struct task_struct *child,
addr_t addr, addr_t data)
{
- struct user32 *dummy32 = NULL;
- per_struct32 *dummy_per32 = NULL;
+ struct compat_user *dummy32 = NULL;
__u32 tmp = (__u32) data;
addr_t offset;
} else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
/*
- * per_info is found in the thread structure.
- */
- offset = addr - (addr_t) &dummy32->regs.per_info;
- /*
- * This is magic. See per_struct and per_struct32.
- * By incident the offsets in per_struct are exactly
- * twice the offsets in per_struct32 for all fields.
- * The 8 byte fields need special handling though,
- * because the second half (bytes 4-7) is needed and
- * not the first half.
+ * Handle access to the per_info structure.
*/
- if ((offset >= (addr_t) &dummy_per32->control_regs &&
- offset < (addr_t) (&dummy_per32->control_regs + 1)) ||
- (offset >= (addr_t) &dummy_per32->starting_addr &&
- offset <= (addr_t) &dummy_per32->ending_addr) ||
- offset == (addr_t) &dummy_per32->lowcore.words.address)
- offset = offset*2 + 4;
- else
- offset = offset*2;
- *(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp;
-
+ addr -= (addr_t) &dummy32->regs.per_info;
+ __poke_user_per_compat(child, addr, data);
}
- FixPerRegisters(child);
return 0;
}
static int poke_user_compat(struct task_struct *child,
addr_t addr, addr_t data)
{
- if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user32) - 3)
+ if (!is_compat_task() || (addr & 3) ||
+ addr > sizeof(struct compat_user) - 3)
return -EIO;
return __poke_user_compat(child, addr, data);
{
unsigned long addr = caddr;
unsigned long data = cdata;
- ptrace_area_emu31 parea;
+ compat_ptrace_area parea;
int copied, ret;
switch (request) {
* Let tracing know that we've done the handler setup.
*/
tracehook_signal_handler(signr, &info, &ka, regs,
- current->thread.per_info.single_step);
+ test_thread_flag(TIF_SINGLE_STEP));
}
return;
}
((regs->psw.addr - (pgm_int_code >> 16)) & PSW_ADDR_INSN);
}
-void __kprobes do_single_step(struct pt_regs *regs)
+void __kprobes do_per_trap(struct pt_regs *regs)
{
- if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0,
- SIGTRAP) == NOTIFY_STOP){
+ if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, SIGTRAP) == NOTIFY_STOP)
return;
- }
if (tracehook_consider_fatal_signal(current, SIGTRAP))
force_sig(SIGTRAP, current);
}
rc = __get_user(instruction, (u16 __user *) regs->psw.addr);
if (!rc && instruction == 0x0a77) {
- clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
+ clear_tsk_thread_flag(current, TIF_PER_TRAP);
if (is_compat_task())
sys32_sigreturn();
else
sys_sigreturn();
} else if (!rc && instruction == 0x0aad) {
- clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
+ clear_tsk_thread_flag(current, TIF_PER_TRAP);
if (is_compat_task())
sys32_rt_sigreturn();
else
* The instruction that caused the program check will
* be repeated. Don't signal single step via SIGTRAP.
*/
- clear_tsk_thread_flag(tsk, TIF_SINGLE_STEP);
+ clear_tsk_thread_flag(tsk, TIF_PER_TRAP);
fault = 0;
out_up:
up_read(&mm->mmap_sem);
projects / linux-2.6-block.git / commitdiff