[RFC patch 14/20] LTTng Kernel Trace Thread Flag s390

Mathieu Desnoyers
2009-03-15T20:29:31Z

[-- Attachment #1: lttng-kernel-trace-thread-flag-s390.patch --]
[-- Type: text/plain, Size: 4306 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
arch/s390/include/asm/thread_info.h | 2 ++
arch/s390/kernel/entry.S | 10 ++++++++--
arch/s390/kernel/entry64.S | 10 ++++++++--
3 files changed, 18 insertions(+), 4 deletions(-)

Index: linux-2.6-lttng/arch/s390/include/asm/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/arch/s390/include/asm/thread_info.h 2009-03-15 15:57:04.000000000 -0400
+++ linux-2.6-lttng/arch/s390/include/asm/thread_info.h 2009-03-15 15:57:17.000000000 -0400
@@ -90,6 +90,7 @@ static inline struct thread_info *curren
#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
#define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */
#define TIF_MCCK_PENDING 7 /* machine check handling is pending */
+#define TIF_KERNEL_TRACE 8 /* kernel trace active */
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
@@ -107,6 +108,7 @@ static inline struct thread_info *curren
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
+#define _TIF_KERNEL_TRACE (1<<TIF_KERNEL_TRACE)
#define _TIF_USEDFPU (1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_31BIT (1<<TIF_31BIT)
Index: linux-2.6-lttng/arch/s390/kernel/entry.S
===================================================================
--- linux-2.6-lttng.orig/arch/s390/kernel/entry.S 2009-03-15 15:51:10.000000000 -0400
+++ linux-2.6-lttng/arch/s390/kernel/entry.S 2009-03-15 15:57:17.000000000 -0400
@@ -265,7 +265,9 @@ sysc_do_restart:
sth %r7,SP_SVCNR(%r15)
sll %r7,2 # svc number *4
l %r8,BASED(.Lsysc_table)
- tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
+ l %r8,__TI_flags+3(%r9)
+ n %r8,BASED(.Lc_tif_syscall_trace_or_audit_or_kernel_trace)
+ ltr %r8,%r8
l %r8,0(%r7,%r8) # get system call addr.
bnz BASED(sysc_tracesys)
basr %r14,%r8 # call sys_xxxx
@@ -405,7 +407,9 @@ sysc_tracego:
basr %r14,%r8 # call sys_xxx
st %r2,SP_R2(%r15) # store return value
sysc_tracenogo:
- tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
+ l %r8,__TI_flags+3(%r9)
+ n %r8,BASED(.Lc_tif_syscall_trace_or_audit_or_kernel_trace)
+ ltr %r8,%r8
bz BASED(sysc_return)
l %r1,BASED(.Ltrace_exit)
la %r2,SP_PTREGS(%r15) # load pt_regs
@@ -1049,6 +1053,8 @@ cleanup_io_leave_insn:
.L0x030: .short 0x030
.L0x038: .short 0x038
.Lc_1: .long 1
+.Lc_tif_syscall_trace_or_audit_or_kernel_trace:
+ .long _TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_KERNEL_TRACE

/*
* Symbol constants
Index: linux-2.6-lttng/arch/s390/kernel/entry64.S
===================================================================
--- linux-2.6-lttng.orig/arch/s390/kernel/entry64.S 2009-03-15 15:51:10.000000000 -0400
+++ linux-2.6-lttng/arch/s390/kernel/entry64.S 2009-03-15 15:57:17.000000000 -0400
@@ -260,7 +260,9 @@ sysc_do_restart:
larl %r10,sys_call_table_emu # use 31 bit emulation system calls
sysc_noemu:
#endif
- tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
+ l %r8,__TI_flags+7(%r9)
+ n %r8,BASED(.Lc_tif_syscall_trace_or_audit_or_kernel_trace)
+ ltr %r8,%r8
lgf %r8,0(%r7,%r10) # load address of system call routine
jnz sysc_tracesys
basr %r14,%r8 # call sys_xxxx
@@ -391,7 +393,9 @@ sysc_tracego:
basr %r14,%r8 # call sys_xxx
stg %r2,SP_R2(%r15) # store return value
sysc_tracenogo:
- tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
+ l %r8,__TI_flags+7(%r9)
+ n %r8,BASED(.Lc_tif_syscall_trace_or_audit_or_kernel_trace)
+ ltr %r8,%r8
jz sysc_return
la %r2,SP_PTREGS(%r15) # load pt_regs
larl %r14,sysc_return # return point is sysc_return
@@ -1033,6 +1037,8 @@ cleanup_io_leave_insn:
.align 4
.Lconst:
.Lnr_syscalls: .long NR_syscalls
+.Lc_tif_syscall_trace_or_audit_or_kernel_trace:
+ .long _TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_KERNEL_TRACE
.L0x0130: .short 0x130
.L0x0140: .short 0x140
.L0x0150: .short 0x150