Commit fc79168a authored by Helge Deller's avatar Helge Deller
Browse files

parisc: Add syscall tracepoint support 



This patch adds support for the TIF_SYSCALL_TRACEPOINT on the parisc
architecture. Basically, it calls the appropriate tracepoints on syscall
entry and exit.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent f6c658df

arch/parisc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ config PARISC 
	select HAVE_OPROFILE

	select HAVE_FUNCTION_TRACER

	select HAVE_FUNCTION_GRAPH_TRACER

	select HAVE_SYSCALL_TRACEPOINTS

	select ARCH_WANT_FRAME_POINTERS

	select RTC_CLASS

	select RTC_DRV_GENERIC

arch/parisc/include/asm/ftrace.h

+2 −0
Original line number Diff line number Diff line
@@ -6,6 +6,8 @@ extern void mcount(void); 


#define MCOUNT_INSN_SIZE 4



extern unsigned long sys_call_table[];



extern unsigned long return_address(unsigned int);



#define ftrace_return_address(n) return_address(n)

arch/parisc/include/asm/syscall.h

+9 −0
Original line number Diff line number Diff line
@@ -8,6 +8,8 @@ 
#include <linux/err.h>

#include <asm/ptrace.h>



#define NR_syscalls (__NR_Linux_syscalls)



static inline long syscall_get_nr(struct task_struct *tsk,

				  struct pt_regs *regs)

{
@@ -33,12 +35,19 @@ static inline void syscall_get_arguments(struct task_struct *tsk, 
		args[1] = regs->gr[25];

	case 1:

		args[0] = regs->gr[26];

	case 0:

		break;

	default:

		BUG();

	}

}



static inline long syscall_get_return_value(struct task_struct *task,

						struct pt_regs *regs)

{

	return regs->gr[28];

}



static inline void syscall_set_return_value(struct task_struct *task,

					    struct pt_regs *regs,

					    int error, long val)

arch/parisc/include/asm/thread_info.h

+3 −1
Original line number Diff line number Diff line
@@ -55,6 +55,7 @@ struct thread_info { 
#define TIF_SINGLESTEP		9	/* single stepping? */

#define TIF_BLOCKSTEP		10	/* branch stepping? */

#define TIF_SECCOMP		11	/* secure computing */

#define TIF_SYSCALL_TRACEPOINT	12	/* syscall tracepoint instrumentation */



#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)

#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
@@ -66,12 +67,13 @@ struct thread_info { 
#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)

#define _TIF_BLOCKSTEP		(1 << TIF_BLOCKSTEP)

#define _TIF_SECCOMP		(1 << TIF_SECCOMP)

#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)



#define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \

                                 _TIF_NEED_RESCHED)

#define _TIF_SYSCALL_TRACE_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP |	\

				 _TIF_BLOCKSTEP | _TIF_SYSCALL_AUDIT | \

				 _TIF_SECCOMP)

				 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT)



#ifdef CONFIG_64BIT

# ifdef CONFIG_COMPAT

arch/parisc/kernel/ptrace.c

+12 −0
Original line number Diff line number Diff line
@@ -30,6 +30,9 @@ 
/* PSW bits we allow the debugger to modify */

#define USER_PSW_BITS	(PSW_N | PSW_B | PSW_V | PSW_CB)



#define CREATE_TRACE_POINTS

#include <trace/events/syscalls.h>



/*

 * Called by kernel/ptrace.c when detaching..

 *
@@ -283,6 +286,10 @@ long do_syscall_trace_enter(struct pt_regs *regs) 
		regs->gr[20] = -1UL;

		goto out;

	}

#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS

	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))

		trace_sys_enter(regs, regs->gr[20]);

#endif



#ifdef CONFIG_64BIT

	if (!is_compat_task())
@@ -311,6 +318,11 @@ void do_syscall_trace_exit(struct pt_regs *regs) 


	audit_syscall_exit(regs);



#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS

	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))

		trace_sys_exit(regs, regs->gr[20]);

#endif



	if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))

		tracehook_report_syscall_exit(regs, stepping);

}