perf/x86/64: Do not guess user_regs->cs, ss, sp in get_regs_user()

After recent changes to syscall entry points,
user_regs->{cs,ss,sp} are always correct. (They used to be
undefined while in syscalls).

We can report them reliably, without guessing.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1428671219-29341-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/perf_regs.c b/arch/x86/kernel/perf_regs.c
index 02a8720..7ab198a 100644 (file)
--- a/arch/x86/kernel/perf_regs.c
+++ b/arch/x86/kernel/perf_regs.c
@@ -131,8 +131,8 @@ void perf_get_regs_user(struct perf_regs *regs_user,
        }
 
        /*
-        * RIP, flags, and the argument registers are usually saved.
-        * orig_ax is probably okay, too.
+        * These registers are always saved on 64-bit syscall entry.
+        * On 32-bit entry points, they are saved too except r8..r11.
         */
        regs_user_copy->ip = user_regs->ip;
        regs_user_copy->cx = user_regs->cx;
@@ -145,9 +145,12 @@ void perf_get_regs_user(struct perf_regs *regs_user,
        regs_user_copy->r11 = user_regs->r11;
        regs_user_copy->orig_ax = user_regs->orig_ax;
        regs_user_copy->flags = user_regs->flags;
+       regs_user_copy->sp = user_regs->sp;
+       regs_user_copy->cs = user_regs->cs;
+       regs_user_copy->ss = user_regs->ss;
 
        /*
-        * Don't even try to report the "rest" regs.
+        * Most system calls don't save these registers, don't report them.
         */
        regs_user_copy->bx = -1;
        regs_user_copy->bp = -1;
@@ -158,7 +161,7 @@ void perf_get_regs_user(struct perf_regs *regs_user,
 
        /*
         * For this to be at all useful, we need a reasonable guess for
-        * sp and the ABI.  Be careful: we're in NMI context, and we're
+        * the ABI.  Be careful: we're in NMI context, and we're
         * considering current to be the current task, so we should
         * be careful not to look at any other percpu variables that might
         * change during context switches.
@@ -167,9 +170,6 @@ void perf_get_regs_user(struct perf_regs *regs_user,
            task_thread_info(current)->status & TS_COMPAT) {
                /* Easy case: we're in a compat syscall. */
                regs_user->abi = PERF_SAMPLE_REGS_ABI_32;
-               regs_user_copy->sp = user_regs->sp;
-               regs_user_copy->cs = user_regs->cs;
-               regs_user_copy->ss = user_regs->ss;
        } else if (user_regs->orig_ax != -1) {
                /*
                 * We're probably in a 64-bit syscall.
@@ -177,17 +177,12 @@ void perf_get_regs_user(struct perf_regs *regs_user,
                 * than just blindly copying user_regs.
                 */
                regs_user->abi = PERF_SAMPLE_REGS_ABI_64;
-               regs_user_copy->sp = user_regs->sp;
-               regs_user_copy->cs = __USER_CS;
-               regs_user_copy->ss = __USER_DS;
-               regs_user_copy->cx = -1;  /* usually contains garbage */
+               /* usually contains return address (same as ->ip) */
+               regs_user_copy->cx = -1;
        } else {
                /* We're probably in an interrupt or exception. */
                regs_user->abi = user_64bit_mode(user_regs) ?
                        PERF_SAMPLE_REGS_ABI_64 : PERF_SAMPLE_REGS_ABI_32;
-               regs_user_copy->sp = user_regs->sp;
-               regs_user_copy->cs = user_regs->cs;
-               regs_user_copy->ss = user_regs->ss;
        }
 
        regs_user->regs = regs_user_copy;