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Commit 1d7bf993 authored by Ralf Baechle's avatar Ralf Baechle
Browse files

MIPS: ftrace: Add support for syscall tracepoints. 



Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 0dfa95aa

arch/mips/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ config MIPS 
	select HAVE_KPROBES

	select HAVE_KRETPROBES

	select HAVE_DEBUG_KMEMLEAK

	select HAVE_SYSCALL_TRACEPOINTS

	select ARCH_BINFMT_ELF_RANDOMIZE_PIE

	select HAVE_ARCH_TRANSPARENT_HUGEPAGE if CPU_SUPPORTS_HUGEPAGES && 64BIT

	select RTC_LIB if !MACH_LOONGSON

arch/mips/include/asm/syscall.h

+19 −0
Original line number Diff line number Diff line
@@ -59,6 +59,25 @@ static inline unsigned long mips_get_syscall_arg(unsigned long *arg, 
	}

}



static inline long syscall_get_return_value(struct task_struct *task,

					    struct pt_regs *regs)

{

	return regs->regs[2];

}



static inline void syscall_set_return_value(struct task_struct *task,

					    struct pt_regs *regs,

					    int error, long val)

{

	if (error) {

		regs->regs[2] = -error;

		regs->regs[7] = -1;

	} else {

		regs->regs[2] = val;

		regs->regs[7] = 0;

	}

}



static inline void syscall_get_arguments(struct task_struct *task,

					 struct pt_regs *regs,

					 unsigned int i, unsigned int n,

arch/mips/include/asm/thread_info.h

+6 −3
Original line number Diff line number Diff line
@@ -116,6 +116,7 @@ static inline struct thread_info *current_thread_info(void) 
#define TIF_32BIT_ADDR		23	/* 32-bit address space (o32/n32) */

#define TIF_FPUBOUND		24	/* thread bound to FPU-full CPU set */

#define TIF_LOAD_WATCH		25	/* If set, load watch registers */

#define TIF_SYSCALL_TRACEPOINT	26	/* syscall tracepoint instrumentation */

#define TIF_SYSCALL_TRACE	31	/* syscall trace active */



#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
@@ -132,20 +133,22 @@ static inline struct thread_info *current_thread_info(void) 
#define _TIF_32BIT_ADDR		(1<<TIF_32BIT_ADDR)

#define _TIF_FPUBOUND		(1<<TIF_FPUBOUND)

#define _TIF_LOAD_WATCH		(1<<TIF_LOAD_WATCH)

#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)



#define _TIF_WORK_SYSCALL_ENTRY	(_TIF_NOHZ | _TIF_SYSCALL_TRACE |	\

				 _TIF_SYSCALL_AUDIT)

				 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)



/* work to do in syscall_trace_leave() */

#define _TIF_WORK_SYSCALL_EXIT	(_TIF_NOHZ | _TIF_SYSCALL_TRACE |	\

				 _TIF_SYSCALL_AUDIT)

				 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)



/* work to do on interrupt/exception return */

#define _TIF_WORK_MASK		\

	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)

/* work to do on any return to u-space */

#define _TIF_ALLWORK_MASK	(_TIF_NOHZ | _TIF_WORK_MASK |		\

				 _TIF_WORK_SYSCALL_EXIT)

				 _TIF_WORK_SYSCALL_EXIT |		\

				 _TIF_SYSCALL_TRACEPOINT)



/*

 * We stash processor id into a COP0 register to retrieve it fast

arch/mips/include/asm/unistd.h

+7 −0
Original line number Diff line number Diff line
@@ -14,6 +14,13 @@ 


#include <uapi/asm/unistd.h>



#ifdef CONFIG_MIPS32_N32

#define NR_syscalls  (__NR_N32_Linux + __NR_N32_Linux_syscalls)

#elif defined(CONFIG_64BIT)

#define NR_syscalls  (__NR_64_Linux + __NR_64_Linux_syscalls)

#else

#define NR_syscalls  (__NR_O32_Linux + __NR_O32_Linux_syscalls)

#endif



#ifndef __ASSEMBLY__

arch/mips/kernel/ptrace.c

+10 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#include <linux/tracehook.h>

#include <linux/audit.h>

#include <linux/seccomp.h>

#include <linux/ftrace.h>



#include <asm/byteorder.h>

#include <asm/cpu.h>
@@ -43,6 +44,9 @@ 
#include <asm/bootinfo.h>

#include <asm/reg.h>



#define CREATE_TRACE_POINTS

#include <trace/events/syscalls.h>



/*

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

 *
@@ -664,6 +668,9 @@ asmlinkage void syscall_trace_enter(struct pt_regs *regs) 
	    tracehook_report_syscall_entry(regs))

		ret = -1;



	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))

		trace_sys_enter(regs, regs->regs[2]);



	audit_syscall_entry(__syscall_get_arch(),

			    regs->regs[2],

			    regs->regs[4], regs->regs[5],
@@ -685,6 +692,9 @@ asmlinkage void syscall_trace_leave(struct pt_regs *regs) 


	audit_syscall_exit(regs);



	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))

		trace_sys_exit(regs, regs->regs[2]);



	if (test_thread_flag(TIF_SYSCALL_TRACE))

		tracehook_report_syscall_exit(regs, 0);