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* exceptions.cc (sigreturn): Don't clobber ebp in recursive signal calls.

This commit is contained in:
Christopher Faylor 2003-08-22 19:25:56 +00:00
parent 9fc9e1c916
commit 897c6b5231
4 changed files with 31 additions and 14 deletions
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5
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,8 @@
2003-08-20 Pierre Humblet <pierre.humblet@ieee.org>
* exceptions.cc (sigreturn): Don't clobber ebp in recursive signal
calls.
2003-08-22 Christopher Faylor <cgf@redhat.com>
* exceptions.cc (sig_handle): Change so that default signals indicate

1
winsup/cygwin/cygheap.h
View File

@ -234,6 +234,7 @@ struct user_heap_info
void *base;
void *ptr;
void *top;
void *max;
unsigned chunk;
};

6
winsup/cygwin/exceptions.cc
View File

@ -1225,8 +1225,7 @@ _sigreturn: \n\
cmpl $0,%4 # Did a signal come in? \n\
jz 1f # No, if zero \n\
movl %2,%%eax \n\
movl %%esp,%%ebp \n\
movl %%eax,36(%%ebp) # Restore return address \n\
movl %%eax,36(%%esp) # Restore return address \n\
jmp 3f \n\
\n\
1: popl %%eax # saved errno \n\
@ -1275,7 +1274,8 @@ _sigdelayed0: \n\
__no_sig_end: \n\
" : "=m" (sigsave.sig): "X" ((char *) &_impure_ptr->_errno),
"g" (sigsave.retaddr), "g" (sigsave.oldmask), "g" (sigsave.sig),
"g" (sigsave.func), "g" (sigsave.saved_errno), "g" (sigsave.newmask)
"g" (sigsave.func), "g" (sigsave.saved_errno), "g" (sigsave.newmask),
"g" (sigsave.retaddr_on_stack)
);
}
}

33
winsup/cygwin/heap.cc
View File

@ -56,6 +56,7 @@ heap_init ()
if (cygheap->user_heap.base == NULL)
api_fatal ("unable to allocate heap, heap_chunk_size %d, %E",
cygheap->user_heap.chunk);
cygheap->user_heap.max = (char *) cygheap->user_heap.base + cygheap->user_heap.chunk;
}
else
{
@ -101,7 +102,7 @@ sbrk (int n)
unsigned commitbytes, newbrksize;
if (n == 0)
return cygheap->user_heap.ptr; /* Just wanted to find current cygheap->user_heap.ptr address */
return cygheap->user_heap.ptr; /* Just wanted to find current cygheap->user_heap.ptr address */
newbrk = (char *) cygheap->user_heap.ptr + n; /* Where new cygheap->user_heap.ptr will be */
newtop = (char *) pround (newbrk); /* Actual top of allocated memory -
@ -122,23 +123,33 @@ sbrk (int n)
assert (newtop > cygheap->user_heap.top);
/* Need to grab more pages from the OS. If this fails it may be because
* we have used up previously reserved memory. Or, we're just plumb out
* of memory. */
/* Find the number of bytes to commit, rounded up to the nearest page. */
commitbytes = pround (newtop - (char *) cygheap->user_heap.top);
if (VirtualAlloc (cygheap->user_heap.top, commitbytes, MEM_COMMIT, PAGE_READWRITE) != NULL)
goto good;
/* Need to grab more pages from the OS. If this fails it may be because
we have used up previously reserved memory. Or, we're just plumb out
of memory. Only attempt to commit memory that we know we've previously
reserved. */
if (newtop <= cygheap->user_heap.max)
{
if (VirtualAlloc (cygheap->user_heap.top, commitbytes, MEM_COMMIT, PAGE_READWRITE) != NULL)
goto good;
}
/* Couldn't allocate memory. Maybe we can reserve some more.
Reserve either the maximum of the standard cygwin_shared->heap_chunk_size () or the requested
amount. Then attempt to actually allocate it. */
Reserve either the maximum of the standard cygwin_shared->heap_chunk_size ()
or the requested amount. Then attempt to actually allocate it. */
if ((newbrksize = cygheap->user_heap.chunk) < commitbytes)
newbrksize = commitbytes;
if ((VirtualAlloc (cygheap->user_heap.top, newbrksize, MEM_RESERVE, PAGE_NOACCESS) != NULL) &&
(VirtualAlloc (cygheap->user_heap.top, commitbytes, MEM_COMMIT, PAGE_READWRITE) != NULL))
goto good;
if ((VirtualAlloc (cygheap->user_heap.top, newbrksize, MEM_RESERVE, PAGE_NOACCESS)
|| VirtualAlloc (cygheap->user_heap.top, newbrksize = commitbytes, MEM_RESERVE, PAGE_NOACCESS))
&& VirtualAlloc (cygheap->user_heap.top, commitbytes, MEM_COMMIT, PAGE_READWRITE) != NULL)
{
(char *) cygheap->user_heap.max += newbrksize;
goto good;
}
err:
set_errno (ENOMEM);