diff options
Diffstat (limited to 'nptl/unwind.c')
| -rw-r--r-- | nptl/unwind.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/nptl/unwind.c b/nptl/unwind.c index 8013b5a..f72c338 100644 --- a/nptl/unwind.c +++ b/nptl/unwind.c @@ -28,9 +28,11 @@ #ifdef HAVE_FORCED_UNWIND #ifdef _STACK_GROWS_DOWN -# define FRAME_LEFT(frame, other) ((char *) frame >= (char *) other) +# define FRAME_LEFT(frame, other, adj) \ + ((uintptr_t) frame - adj >= (uintptr_t) other - adj) #elif _STACK_GROWS_UP -# define FRAME_LEFT(frame, other) ((char *) frame <= (char *) other) +# define FRAME_LEFT(frame, other, adj) \ + ((uintptr_t) frame - adj <= (uintptr_t) other - adj) #else # error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP" #endif @@ -45,6 +47,11 @@ unwind_stop (int version, _Unwind_Action actions, struct pthread *self = THREAD_SELF; struct _pthread_cleanup_buffer *curp = THREAD_GETMEM (self, cleanup); int do_longjump = 0; + + /* Adjust all pointers used in comparisons, so that top of thread's + stack is at the top of address space. Without that, things break + if stack is allocated above the main stack. */ + uintptr_t adj = (uintptr_t) self->stackblock + self->stackblock_size; /* Do longjmp if we're at "end of stack", aka "end of unwind data". We assume there are only C frame without unwind data in between @@ -52,7 +59,8 @@ unwind_stop (int version, _Unwind_Action actions, of a function is NOT within it's stack frame; it's the SP of the previous frame. */ if ((actions & _UA_END_OF_STACK) - || ! _JMPBUF_CFA_UNWINDS (buf->cancel_jmp_buf[0].jmp_buf, context)) + || ! _JMPBUF_CFA_UNWINDS_ADJ (buf->cancel_jmp_buf[0].jmp_buf, context, + adj)) do_longjump = 1; if (__builtin_expect (curp != NULL, 0)) @@ -63,7 +71,7 @@ unwind_stop (int version, _Unwind_Action actions, struct _pthread_cleanup_buffer *oldp = buf->priv.data.cleanup; void *cfa = (void *) _Unwind_GetCFA (context); - if (curp != oldp && (do_longjump || FRAME_LEFT (cfa, curp))) + if (curp != oldp && (do_longjump || FRAME_LEFT (cfa, curp, adj))) { do { @@ -76,7 +84,8 @@ unwind_stop (int version, _Unwind_Action actions, /* To the next. */ curp = nextp; } - while (curp != oldp && (do_longjump || FRAME_LEFT (cfa, curp))); + while (curp != oldp + && (do_longjump || FRAME_LEFT (cfa, curp, adj))); /* Mark the current element as handled. */ THREAD_SETMEM (self, cleanup, curp); |