From 9bf1226b33dc2f94fc37ffd70ee161e2bda1ff5c Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Fri, 12 Jun 2009 10:26:47 +0200 Subject: [S390] ftrace: add system call tracer support System call tracer support for s390. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/Kconfig | 1 + arch/s390/include/asm/syscall.h | 1 + arch/s390/include/asm/thread_info.h | 2 ++ arch/s390/kernel/entry.S | 4 ++- arch/s390/kernel/entry64.S | 4 ++- arch/s390/kernel/ftrace.c | 56 +++++++++++++++++++++++++++++++++++++ arch/s390/kernel/ptrace.c | 7 +++++ 7 files changed, 73 insertions(+), 2 deletions(-) (limited to 'arch/s390') diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 9023cc900bd..99dc3ded6b4 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -84,6 +84,7 @@ config S390 select HAVE_FUNCTION_TRACER select HAVE_FUNCTION_TRACE_MCOUNT_TEST select HAVE_FTRACE_MCOUNT_RECORD + select HAVE_FTRACE_SYSCALLS select HAVE_DYNAMIC_FTRACE select HAVE_FUNCTION_GRAPH_TRACER select HAVE_DEFAULT_NO_SPIN_MUTEXES diff --git a/arch/s390/include/asm/syscall.h b/arch/s390/include/asm/syscall.h index 2429b87eb28..e0a73d3eb83 100644 --- a/arch/s390/include/asm/syscall.h +++ b/arch/s390/include/asm/syscall.h @@ -12,6 +12,7 @@ #ifndef _ASM_SYSCALL_H #define _ASM_SYSCALL_H 1 +#include #include static inline long syscall_get_nr(struct task_struct *task, diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h index 2f86653dda6..925bcc64903 100644 --- a/arch/s390/include/asm/thread_info.h +++ b/arch/s390/include/asm/thread_info.h @@ -92,6 +92,7 @@ static inline struct thread_info *current_thread_info(void) #define TIF_SYSCALL_TRACE 8 /* syscall trace active */ #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ #define TIF_SECCOMP 10 /* secure computing */ +#define TIF_SYSCALL_FTRACE 11 /* ftrace syscall instrumentation */ #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 */ @@ -110,6 +111,7 @@ static inline struct thread_info *current_thread_info(void) #define _TIF_SYSCALL_TRACE (1<>8 | _TIF_SYSCALL_AUDIT>>8 | _TIF_SECCOMP>>8) +_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \ + _TIF_SECCOMP>>8 | _TIF_SYSCALL_FTRACE>>8) STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER STACK_SIZE = 1 << STACK_SHIFT @@ -1108,6 +1109,7 @@ cleanup_io_leave_insn: .section .rodata, "a" #define SYSCALL(esa,esame,emu) .long esa + .globl sys_call_table sys_call_table: #include "syscalls.S" #undef SYSCALL diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 3cec9b504f5..f6618e9e15e 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -56,7 +56,8 @@ _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_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ _TIF_MCCK_PENDING) -_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | _TIF_SECCOMP>>8) +_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \ + _TIF_SECCOMP>>8 | _TIF_SYSCALL_FTRACE>>8) #define BASED(name) name-system_call(%r13) @@ -1059,6 +1060,7 @@ cleanup_io_leave_insn: .section .rodata, "a" #define SYSCALL(esa,esame,emu) .long esame + .globl sys_call_table sys_call_table: #include "syscalls.S" #undef SYSCALL diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c index c92a1095327..82ddfd3a75a 100644 --- a/arch/s390/kernel/ftrace.c +++ b/arch/s390/kernel/ftrace.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #ifdef CONFIG_DYNAMIC_FTRACE @@ -202,3 +203,58 @@ out: return parent; } #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ + +#ifdef CONFIG_FTRACE_SYSCALLS + +extern unsigned long __start_syscalls_metadata[]; +extern unsigned long __stop_syscalls_metadata[]; +extern unsigned int sys_call_table[]; + +static struct syscall_metadata **syscalls_metadata; + +struct syscall_metadata *syscall_nr_to_meta(int nr) +{ + if (!syscalls_metadata || nr >= NR_syscalls || nr < 0) + return NULL; + + return syscalls_metadata[nr]; +} + +static struct syscall_metadata *find_syscall_meta(unsigned long syscall) +{ + struct syscall_metadata *start; + struct syscall_metadata *stop; + char str[KSYM_SYMBOL_LEN]; + + start = (struct syscall_metadata *)__start_syscalls_metadata; + stop = (struct syscall_metadata *)__stop_syscalls_metadata; + kallsyms_lookup(syscall, NULL, NULL, NULL, str); + + for ( ; start < stop; start++) { + if (start->name && !strcmp(start->name + 3, str + 3)) + return start; + } + return NULL; +} + +void arch_init_ftrace_syscalls(void) +{ + struct syscall_metadata *meta; + int i; + static atomic_t refs; + + if (atomic_inc_return(&refs) != 1) + goto out; + syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) * NR_syscalls, + GFP_KERNEL); + if (!syscalls_metadata) + goto out; + for (i = 0; i < NR_syscalls; i++) { + meta = find_syscall_meta((unsigned long)sys_call_table[i]); + syscalls_metadata[i] = meta; + } + return; +out: + atomic_dec(&refs); +} +#endif diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c index b6fc1ae2ffc..490b39934d6 100644 --- a/arch/s390/kernel/ptrace.c +++ b/arch/s390/kernel/ptrace.c @@ -37,6 +37,7 @@ #include #include #include +#include #include #include #include @@ -661,6 +662,9 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) ret = -1; } + if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE))) + ftrace_syscall_enter(regs); + if (unlikely(current->audit_context)) audit_syscall_entry(is_compat_task() ? AUDIT_ARCH_S390 : AUDIT_ARCH_S390X, @@ -676,6 +680,9 @@ asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]), regs->gprs[2]); + if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE))) + ftrace_syscall_exit(regs); + if (test_thread_flag(TIF_SYSCALL_TRACE)) tracehook_report_syscall_exit(regs, 0); } -- cgit v1.2.3