diff options
| -rw-r--r-- | kernel/unwind/user.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/unwind/user.c b/kernel/unwind/user.c index 39e270789444..0ca434f86e73 100644 --- a/kernel/unwind/user.c +++ b/kernel/unwind/user.c @@ -31,6 +31,7 @@ static int unwind_user_next_common(struct unwind_user_state *state, { unsigned long cfa, fp, ra; + /* Get the Canonical Frame Address (CFA) */ if (frame->use_fp) { if (state->fp < state->sp) return -EINVAL; @@ -38,11 +39,9 @@ static int unwind_user_next_common(struct unwind_user_state *state, } else { cfa = state->sp; } - - /* Get the Canonical Frame Address (CFA) */ cfa += frame->cfa_off; - /* stack going in wrong direction? */ + /* Make sure that stack is not going in wrong direction */ if (cfa <= state->sp) return -EINVAL; @@ -50,10 +49,11 @@ static int unwind_user_next_common(struct unwind_user_state *state, if (cfa & (state->ws - 1)) return -EINVAL; - /* Find the Return Address (RA) */ + /* Get the Return Address (RA) */ if (get_user_word(&ra, cfa, frame->ra_off, state->ws)) return -EINVAL; + /* Get the Frame Pointer (FP) */ if (frame->fp_off && get_user_word(&fp, cfa, frame->fp_off, state->ws)) return -EINVAL; |