MIPS: ftrace: Add support for syscall tracepoints.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index d523b5489929a95ce9e0b2760e406193a7edf084..d2440478787be284a0e74b9d75affefa119525e5 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -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

diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
index 087df5f26f86783a3576a0f8bbdf55f6a764867d..81c89132c59d8731643c860d4fb3f1c2179d6f6e 100644 (file)
--- a/arch/mips/include/asm/syscall.h
+++ b/arch/mips/include/asm/syscall.h
@@ -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,

diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h
index e0c8cf3b16ffdf9a650fd3fbf7224af649034f07..f9b24bfbdbae96f8cc31d58d7cb0318130ceab9f 100644 (file)
--- a/arch/mips/include/asm/thread_info.h
+++ b/arch/mips/include/asm/thread_info.h
@@ -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

diff --git a/arch/mips/include/asm/unistd.h b/arch/mips/include/asm/unistd.h
index 63c9c886173a68c6a89857b7f7d28046cb712e56..4d3b92886665799d2ca2b746d8efc310cc0c1168 100644 (file)
--- a/arch/mips/include/asm/unistd.h
+++ b/arch/mips/include/asm/unistd.h
@@ -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__
 

diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index b996efcccc11044bab92c34863c8d67d782dc01e..b52e1d2b33e03836002b495328124225ebba29db 100644 (file)
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -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);