diff options
Diffstat (limited to 'libgcc/generic-morestack.c')
| -rw-r--r-- | libgcc/generic-morestack.c | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/libgcc/generic-morestack.c b/libgcc/generic-morestack.c index 3709d32..7e29bbc 100644 --- a/libgcc/generic-morestack.c +++ b/libgcc/generic-morestack.c @@ -1,5 +1,5 @@ /* Library support for -fsplit-stack. */ -/* Copyright (C) 2009, 2010 Free Software Foundation, Inc. +/* Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc. Contributed by Ian Lance Taylor <iant@google.com>. This file is part of GCC. @@ -846,20 +846,24 @@ __splitstack_find (void *segment_arg, void *sp, size_t *len, parameters <- old_stack return in f1 return in f2 - data pushed by __morestack + registers pushed by __morestack - On x86, the data pushed by __morestack includes the saved value - of the ebp/rbp register. We want our caller to be able to see - that value, which can not be found on any other stack. So we - adjust accordingly. This may need to be tweaked for other - targets. */ + The registers pushed by __morestack may not be visible on any + other stack, if we are being called by a signal handler + immediately after the call to __morestack_unblock_signals. We + want to adjust our return value to include those registers. This + is target dependent. */ nsp = (char *) segment->old_stack; -#ifdef STACK_GROWS_DOWNWARD - nsp -= 3 * sizeof (void *); + +#if defined (__x86_64__) + nsp -= 12 * sizeof (void *); +#elif defined (__i386__) + nsp -= 6 * sizeof (void *); #else - nsp += 3 * sizeof (void *); +#error "unrecognized target" #endif + *next_sp = (void *) nsp; #ifdef STACK_GROWS_DOWNWARD |