Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[linux-2.6-omap-h63xx.git] / arch / x86 / kernel / ptrace.c

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 06ca07f6ad86243884c7852c13334d9da9604acf..fe9345c967de2c62bf6681a0202541738f5d9da2 100644 (file)
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -21,6 +21,7 @@
 #include <linux/audit.h>
 #include <linux/seccomp.h>
 #include <linux/signal.h>
+#include <linux/ftrace.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -75,10 +76,7 @@ static inline bool invalid_selector(u16 value)
 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
 {
        BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
-       regno >>= 2;
-       if (regno > FS)
-               --regno;
-       return &regs->bx + regno;
+       return &regs->bx + (regno >> 2);
 }
 
 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
@@ -90,9 +88,10 @@ static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
        if (offset != offsetof(struct user_regs_struct, gs))
                retval = *pt_regs_access(task_pt_regs(task), offset);
        else {
-               retval = task->thread.gs;
                if (task == current)
-                       savesegment(gs, retval);
+                       retval = get_user_gs(task_pt_regs(task));
+               else
+                       retval = task_user_gs(task);
        }
        return retval;
 }
@@ -126,13 +125,10 @@ static int set_segment_reg(struct task_struct *task,
                break;
 
        case offsetof(struct user_regs_struct, gs):
-               task->thread.gs = value;
                if (task == current)
-                       /*
-                        * The user-mode %gs is not affected by
-                        * kernel entry, so we must update the CPU.
-                        */
-                       loadsegment(gs, value);
+                       set_user_gs(task_pt_regs(task), value);
+               else
+                       task_user_gs(task) = value;
        }
 
        return 0;
@@ -273,7 +269,7 @@ static unsigned long debugreg_addr_limit(struct task_struct *task)
        if (test_tsk_thread_flag(task, TIF_IA32))
                return IA32_PAGE_OFFSET - 3;
 #endif
-       return TASK_SIZE64 - 7;
+       return TASK_SIZE_MAX - 7;
 }
 
 #endif /* CONFIG_X86_32 */
@@ -690,9 +686,8 @@ static int ptrace_bts_config(struct task_struct *child,
                if (!cfg.signal)
                        return -EINVAL;
 
-               return -EOPNOTSUPP;
-
                child->thread.bts_ovfl_signal = cfg.signal;
+               return -EOPNOTSUPP;
        }
 
        if ((cfg.flags & PTRACE_BTS_O_ALLOC) &&
@@ -1421,6 +1416,9 @@ asmregparm long syscall_trace_enter(struct pt_regs *regs)
            tracehook_report_syscall_entry(regs))
                ret = -1L;
 
+       if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE)))
+               ftrace_syscall_enter(regs);
+
        if (unlikely(current->audit_context)) {
                if (IS_IA32)
                        audit_syscall_entry(AUDIT_ARCH_I386,
@@ -1444,6 +1442,9 @@ asmregparm void syscall_trace_leave(struct pt_regs *regs)
        if (unlikely(current->audit_context))
                audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
 
+       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);
 
@@ -1461,6 +1462,6 @@ asmregparm void syscall_trace_leave(struct pt_regs *regs)
         * system call instruction.
         */
        if (test_thread_flag(TIF_SINGLESTEP) &&
-           tracehook_consider_fatal_signal(current, SIGTRAP, SIG_DFL))
+           tracehook_consider_fatal_signal(current, SIGTRAP))
                send_sigtrap(current, regs, 0, TRAP_BRKPT);
 }