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* exceptions.cc (stack_info::walk): Use method to find offset. 

(handle_exceptions): Be more assertive in finding ebp for use under W2K.
Create a dummy stack frame for cases where program is dying and a stack dump is
being output.
(sig_handle): Fill out a GetThreadContext for use with a user-generated "core
dump".
This commit is contained in:
Christopher Faylor 2000-07-03 20:14:06 +00:00
parent 4bedf498d6
commit 8366e93be9
6 changed files with 68 additions and 37 deletions
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9
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,12 @@
Mon Jul 3 16:09:16 2000 Christopher Faylor <cgf@cygnus.com>
* exceptions.cc (stack_info::walk): Use method to find offset.
(handle_exceptions): Be more assertive in finding ebp for use under
W2K. Create a dummy stack frame for cases where program is dying and a
stack dump is being output.
(sig_handle): Fill out a GetThreadContext for use with a user-generated
"core dump".
Mon Jul 3 10:53:00 2000 Corinna Vinschen <corinna@vinschen.de>
* include/cygwin/socket.h: Remove SOCK_PACKET define since it's

6
winsup/cygwin/dcrt0.cc
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@ -637,9 +637,6 @@ dll_crt0_1 ()
(void) SetErrorMode (SEM_FAILCRITICALERRORS);
/* Initialize the heap. */
heap_init ();
/* Initialize events. */
events_init ();
@ -673,6 +670,9 @@ dll_crt0_1 ()
longjmp (ciresrv->jmp, ciresrv->cygpid);
}
/* Initialize the heap. */
heap_init ();
/* Initialize our process table entry. Don't use the parent info for
dynamically loaded case. */
pinfo_init ((dynamically_loaded) ? NULL : info);

50
winsup/cygwin/exceptions.cc
View File

@ -197,6 +197,7 @@ class stack_info
{
int first_time; /* True if just starting to iterate. */
int walk (); /* Uses the "old" method */
char *next_offset () {return *((char **) sf.AddrFrame.Offset);}
public:
STACKFRAME sf; /* For storing the stack information */
void init (DWORD); /* Called the first time that stack info is needed */
@ -233,7 +234,7 @@ stack_info::walk ()
if (first_time)
/* Everything is filled out already */
ebp = (char **) sf.AddrFrame.Offset;
else if ((ebp = (char **) *(char **) sf.AddrFrame.Offset) != NULL)
else if ((ebp = (char **) next_offset ()) != NULL)
{
sf.AddrFrame.Offset = (DWORD) ebp;
sf.AddrPC.Offset = sf.AddrReturn.Offset;
@ -255,14 +256,14 @@ stack_info::walk ()
}
/* Dump the stack */
void
static void
stack (CONTEXT *cx)
{
int i;
thestack.init (cx->Ebp); /* Initialize from the input CONTEXT */
small_printf ("Stack trace:\r\nFrame Function Args\r\n");
for (i = 0; i < 16 && thestack++ ; i++)
for (i = 0; i < 16 && thestack++; i++)
{
small_printf ("%08x %08x ", thestack.sf.AddrFrame.Offset,
thestack.sf.AddrPC.Offset);
@ -281,7 +282,7 @@ cygwin_stackdump()
CONTEXT c;
c.ContextFlags = CONTEXT_FULL;
GetThreadContext (GetCurrentThread (), &c);
stack(&c);
stack (&c);
}
static int NO_COPY keep_looping = 0;
@ -342,7 +343,7 @@ try_to_debug ()
return 0;
}
void
static void
stackdump (EXCEPTION_RECORD *e, CONTEXT *in)
{
char *p;
@ -441,6 +442,17 @@ handle_exceptions (EXCEPTION_RECORD *e, void *, CONTEXT *in, void *)
if (myself->getsig(sig).sa_mask & SIGTOMASK (sig))
syscall_printf ("signal %d, masked %p", sig, myself->getsig(sig).sa_mask);
debug_printf ("In cygwin_except_handler calling %p",
myself->getsig(sig).sa_handler);
DWORD *ebp = (DWORD *)in->Esp;
for (DWORD *bpend = (DWORD *) __builtin_frame_address (0); ebp > bpend; ebp--)
if (*ebp == in->SegCs && ebp[-1] == in->Eip)
{
ebp -= 2;
break;
}
if (!myself->progname[0]
|| (void *) myself->getsig(sig).sa_handler == (void *) SIG_DFL
|| (void *) myself->getsig(sig).sa_handler == (void *) SIG_IGN
@ -467,26 +479,18 @@ handle_exceptions (EXCEPTION_RECORD *e, void *, CONTEXT *in, void *)
system_printf ("Error while dumping state (probably corrupted stack)");
else
{
HANDLE hthread;
DuplicateHandle (hMainProc, GetCurrentThread (),
hMainProc, &hthread, 0, FALSE, DUPLICATE_SAME_ACCESS);
stackdump (e, in);
CONTEXT c = *in;
DWORD stack[6];
stack[0] = in->Ebp;
stack[1] = in->Eip;
stack[2] = stack[3] = stack[4] = stack[5] = 0;
c.Ebp = (DWORD) &stack;
stackdump (e, &c);
}
try_to_debug ();
really_exit (EXIT_SIGNAL | sig);
}
debug_printf ("In cygwin_except_handler calling %p",
myself->getsig(sig).sa_handler);
DWORD *ebp = (DWORD *)in->Esp;
for (DWORD *bpend = ebp - 16; ebp > bpend; ebp--)
if (*ebp == in->SegCs && ebp[-1] == in->Eip)
{
ebp -= 2;
break;
}
sig_send (NULL, sig, (DWORD) ebp); // Signal myself
return 0;
}
@ -954,8 +958,12 @@ done:
exit_sig:
if (sig == SIGQUIT || sig == SIGABRT)
{
stackdump (NULL, NULL);
CONTEXT c;
c.ContextFlags = CONTEXT_FULL;
GetThreadContext (hMainThread, &c);
stackdump (NULL, &c);
try_to_debug ();
really_exit (EXIT_SIGNAL | sig);
}
sigproc_printf ("signal %d, about to call do_exit", sig);
TerminateThread (hMainThread, 0);

16
winsup/cygwin/fork.cc
View File

@ -445,13 +445,13 @@ fork ()
MALLOC_CHECK;
rc = fork_copy (pi, "dll data", dll_data_start, dll_data_end,
dll_bss_start, dll_bss_end, NULL);
rc = fork_copy (pi, "user/cygwin data",
user_data->data_start, user_data->data_end,
user_data->bss_start, user_data->bss_end,
ch.heapbase, ch.heapptr,
stack_here, ch.stackbottom,
dll_data_start, dll_data_end,
dll_bss_start, dll_bss_end, NULL);
NULL);
MALLOC_CHECK;
if (!rc)
@ -526,14 +526,22 @@ fork ()
}
sync_with_parent ("after longjmp.", TRUE);
ProtectHandle (hParent);
#ifdef DEBUGGING
char c;
if (GetEnvironmentVariable ("FORKDEBUG", &c, 1))
try_to_debug ();
char buf[80];
if (GetEnvironmentVariable ("CYGWIN_FORK_SLEEP", buf, sizeof (buf)))
{
small_printf ("Sleeping %d after fork, pid %u\n", atoi (buf), GetCurrentProcessId ());
Sleep (atoi(buf));
}
#endif
heap_init ();
ProtectHandle (hParent);
/* If we've played with the stack, stacksize != 0. That means that
fork() was invoked from other than the main thread. Make sure that
when the "main" thread exits it calls do_exit, like a normal process.

22
winsup/cygwin/heap.cc
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@ -20,6 +20,8 @@ details. */
static unsigned page_const = 0;
HANDLE cygwin_heap;
static __inline__ int
getpagesize(void)
{
@ -36,9 +38,9 @@ heap_init ()
/* If we're the forkee, we must allocate the heap at exactly the same place
as our parent. If not, we don't care where it ends up. */
page_const = getpagesize();
if (brkbase)
{
DWORD chunk = brkchunk; /* allocation chunk */
/* total size commited in parent */
DWORD allocsize = (char *) brktop - (char *) brkbase;
@ -46,14 +48,13 @@ heap_init ()
DWORD reserve_size = chunk * ((allocsize + (chunk - 1)) / chunk);
/* Loop until we've managed to reserve an adequate amount of memory. */
char *p;
void *p;
for (;;)
{
p = (char *) VirtualAlloc (brkbase, reserve_size,
MEM_RESERVE, PAGE_READWRITE);
p = MapViewOfFileEx (cygwin_heap, FILE_MAP_COPY, 0L, 0L, 0L, brkbase);
if (p)
break;
if ((reserve_size -= page_const) <= allocsize)
if ((reserve_size -= (page_const + 1)) <= allocsize)
break;
}
if (p == NULL)
@ -61,20 +62,25 @@ heap_init ()
brkchunk, myself->pid);
if (p != brkbase)
api_fatal ("heap allocated but not at %p", brkbase);
if (! VirtualAlloc (brkbase, allocsize, MEM_COMMIT, PAGE_READWRITE))
if (!VirtualAlloc (brkbase, allocsize, MEM_COMMIT, PAGE_READWRITE))
api_fatal ("MEM_COMMIT failed, %E");
}
else
{
page_const = getpagesize() - 1;
/* Initialize page mask and default heap size. Preallocate a heap
* to assure contiguous memory. */
brk = brktop = brkbase = VirtualAlloc(NULL, brkchunk, MEM_RESERVE, PAGE_NOACCESS);
cygwin_heap = CreateFileMapping ((HANDLE) 0xffffffff, &sec_all, PAGE_WRITECOPY | SEC_RESERVE, 0L, brkchunk, NULL);
if (cygwin_heap == NULL)
api_fatal ("2. unable to allocate shared memory for heap, heap_chunk_size %d, %E", brkchunk);
brk = brktop = brkbase = MapViewOfFile (cygwin_heap, 0, 0L, 0L, 0);
// brk = brktop = brkbase = VirtualAlloc(NULL, brkchunk, MEM_RESERVE, PAGE_NOACCESS);
if (brkbase == NULL)
api_fatal ("2. unable to allocate heap, heap_chunk_size %d, %E",
brkchunk);
}
page_const--;
malloc_init ();
}

2
winsup/cygwin/shared.h
View File

@ -172,7 +172,7 @@ pinfo *__stdcall procinfo (int n);
enum
{
PROC_MAGIC = 0xaf08f000,
PROC_MAGIC = 0xaf09f000,
PROC_FORK = PROC_MAGIC + 1,
PROC_EXEC = PROC_MAGIC + 2,
PROC_SPAWN = PROC_MAGIC + 3,