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generic-morestack.c (__splitstack_find): Adjust returned stack pointer to include all registers pushed by __morestack.

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* generic-morestack.c (__splitstack_find): Adjust returned stack
	pointer to include all registers pushed by __morestack.

From-SVN: r170757
This commit is contained in:
Ian Lance Taylor 2011-03-07 21:47:10 +00:00 committed by Ian Lance Taylor
parent c7e529d3bc
commit 457186f6d5
2 changed files with 19 additions and 10 deletions
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5
libgcc/ChangeLog
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@ -1,3 +1,8 @@
2011-03-07 Ian Lance Taylor <iant@google.com>
* generic-morestack.c (__splitstack_find): Adjust returned stack
pointer to include all registers pushed by __morestack.
2011-01-26 Dave Korn <dave.korn.cygwin@gmail.com>
PR target/40125

24
libgcc/generic-morestack.c
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@ -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