lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[S390] ptrace changes

Browse Source 
* System call parameter and result access functions
* Add tracehook calls
* Split syscall_trace into two functions do_syscall_trace_enter and
  do_syscall_trace_exit

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2008-10-10 21:33:20 +02:00
parent d86730bb95
commit 753c4dd6a2
8 changed files with 202 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
arch/s390/kernel/entry64.S
View File

@ -52,9 +52,9 @@ SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE
STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE = 1 << STACK_SHIFT
_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
_TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
_TIF_MCCK_PENDING)
#define BASED(name) name-system_call(%r13)
@ -310,6 +310,8 @@ sysc_work:
jo sysc_reschedule
tm __TI_flags+7(%r9),_TIF_SIGPENDING
jnz sysc_sigpending
tm __TI_flags+7(%r9),_TIF_NOTIFY_RESUME
jnz sysc_notify_resume
tm __TI_flags+7(%r9),_TIF_RESTART_SVC
jo sysc_restart
tm __TI_flags+7(%r9),_TIF_SINGLE_STEP
@ -344,6 +346,14 @@ sysc_sigpending:
jo sysc_singlestep
j sysc_work_loop
#
# _TIF_NOTIFY_RESUME is set, call do_notify_resume
#
sysc_notify_resume:
la %r2,SP_PTREGS(%r15) # load pt_regs
larl %r14,sysc_work_loop
jg do_notify_resume # call do_notify_resume
#
# _TIF_RESTART_SVC is set, set up registers and restart svc
#
@ -367,20 +377,19 @@ sysc_singlestep:
jg do_single_step # branch to do_sigtrap
#
# call syscall_trace before and after system call
# special linkage: %r12 contains the return address for trace_svc
# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
# and after the system call
#
sysc_tracesys:
la %r2,SP_PTREGS(%r15) # load pt_regs
la %r3,0
srl %r7,2
stg %r7,SP_R2(%r15)
brasl %r14,syscall_trace
brasl %r14,do_syscall_trace_enter
lghi %r0,NR_syscalls
clg %r0,SP_R2(%r15)
clgr %r0,%r2
jnh sysc_tracenogo
lg %r7,SP_R2(%r15) # strace might have changed the
sll %r7,2 # system call
slag %r7,%r2,2 # *4
lgf %r8,0(%r7,%r10)
sysc_tracego:
lmg %r3,%r6,SP_R3(%r15)
@ -391,9 +400,8 @@ sysc_tracenogo:
tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
jz sysc_return
la %r2,SP_PTREGS(%r15) # load pt_regs
la %r3,1
larl %r14,sysc_return # return point is sysc_return
jg syscall_trace
jg do_syscall_trace_exit
#
# a new process exits the kernel with ret_from_fork
@ -672,6 +680,8 @@ io_work_loop:
jo io_reschedule
tm __TI_flags+7(%r9),_TIF_SIGPENDING
jnz io_sigpending
tm __TI_flags+7(%r9),_TIF_NOTIFY_RESUME
jnz io_notify_resume
j io_restore
io_work_done:
@ -712,6 +722,18 @@ io_sigpending:
TRACE_IRQS_OFF
j io_work_loop
#
# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
#
io_notify_resume:
TRACE_IRQS_ON
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
la %r2,SP_PTREGS(%r15) # load pt_regs
brasl %r14,do_notify_resume # call do_notify_resume
stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
TRACE_IRQS_OFF
j io_work_loop
/*
* External interrupt handler routine
*/