/* More subroutines needed by GCC output code on some machines. */
/* Compile this one with gcc. */
-/* Copyright (C) 1989, 92, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1989, 92-97, 1998 Free Software Foundation, Inc.
This file is part of GNU CC.
do not apply. */
#include "tconfig.h"
+
+/* We disable this when inhibit_libc, so that gcc can still be built without
+ needing header files first. */
+/* ??? This is not a good solution, since prototypes may be required in
+ some cases for correct code. See also frame.c. */
+#ifndef inhibit_libc
+/* fixproto guarantees these system headers exist. */
+#include <stdlib.h>
+#include <unistd.h>
+#endif
+
#include "machmode.h"
#include "defaults.h"
#ifndef L_trampoline
/* In a cross-compilation situation, default to inhibiting compilation
of routines that use libc. */
-#ifdef CROSS_COMPILE
+#if defined(CROSS_COMPILE) && !defined(inhibit_libc)
#define inhibit_libc
#endif
#else
/* If sdiv_qrnnd doesn't exist, define dummy __udiv_w_sdiv. */
USItype
-__udiv_w_sdiv (USItype *rp, USItype a1, USItype a0, USItype d)
-{}
+__udiv_w_sdiv (USItype *rp __attribute__ ((__unused__)),
+ USItype a1 __attribute__ ((__unused__)),
+ USItype a0 __attribute__ ((__unused__)),
+ USItype d __attribute__ ((__unused__)))
+{
+ return 0;
+}
#endif
#endif
\f
__floatdixf (DItype u)
{
XFtype d;
- SItype negate = 0;
-
- if (u < 0)
- u = -u, negate = 1;
- d = (USItype) (u >> WORD_SIZE);
+ d = (SItype) (u >> WORD_SIZE);
d *= HIGH_HALFWORD_COEFF;
d *= HIGH_HALFWORD_COEFF;
d += (USItype) (u & (HIGH_WORD_COEFF - 1));
- return (negate ? -d : d);
+ return d;
}
#endif
__floatditf (DItype u)
{
TFtype d;
- SItype negate = 0;
-
- if (u < 0)
- u = -u, negate = 1;
- d = (USItype) (u >> WORD_SIZE);
+ d = (SItype) (u >> WORD_SIZE);
d *= HIGH_HALFWORD_COEFF;
d *= HIGH_HALFWORD_COEFF;
d += (USItype) (u & (HIGH_WORD_COEFF - 1));
- return (negate ? -d : d);
+ return d;
}
#endif
__floatdidf (DItype u)
{
DFtype d;
- SItype negate = 0;
- if (u < 0)
- u = -u, negate = 1;
-
- d = (USItype) (u >> WORD_SIZE);
+ d = (SItype) (u >> WORD_SIZE);
d *= HIGH_HALFWORD_COEFF;
d *= HIGH_HALFWORD_COEFF;
d += (USItype) (u & (HIGH_WORD_COEFF - 1));
- return (negate ? -d : d);
+ return d;
}
#endif
so that we don't lose any of the precision of the high word
while multiplying it. */
DFtype f;
- SItype negate = 0;
-
- if (u < 0)
- u = -u, negate = 1;
/* Protect against double-rounding error.
Represent any low-order bits, that might be truncated in DFmode,
&& DF_SIZE > (DI_SIZE - DF_SIZE + SF_SIZE))
{
#define REP_BIT ((USItype) 1 << (DI_SIZE - DF_SIZE))
- if (u >= ((UDItype) 1 << DF_SIZE))
+ if (! (- ((DItype) 1 << DF_SIZE) < u
+ && u < ((DItype) 1 << DF_SIZE)))
{
if ((USItype) u & (REP_BIT - 1))
u |= REP_BIT;
}
}
- f = (USItype) (u >> WORD_SIZE);
+ f = (SItype) (u >> WORD_SIZE);
f *= HIGH_HALFWORD_COEFF;
f *= HIGH_HALFWORD_COEFF;
f += (USItype) (u & (HIGH_WORD_COEFF - 1));
- return (SFtype) (negate ? -f : f);
+ return (SFtype) f;
}
#endif
#if defined(__MIPSEL__) | defined(__R3000__) | defined(__R2000__) | defined(__mips__)
asm (" .text");
+#ifdef __mips16
+ asm (" .set nomips16");
+#endif
asm (" .ent __builtin_saveregs");
asm (" .globl __builtin_saveregs");
asm ("__builtin_saveregs:");
#undef NULL /* Avoid errors if stdio.h and our stddef.h mismatch. */
#include <stdio.h>
/* This is used by the `assert' macro. */
+extern void __eprintf (const char *, const char *, unsigned int, const char *)
+ __attribute__ ((__noreturn__));
+
void
__eprintf (const char *string, const char *expression,
- int line, const char *filename)
+ unsigned int line, const char *filename)
{
fprintf (stderr, string, expression, line, filename);
fflush (stderr);
#include "gbl-ctors.h"
#include "gcov-io.h"
+#include <string.h>
static struct bb *bb_head;
if ((da_file = fopen (ptr->filename, "r")) != 0)
{
long n_counts = 0;
- unsigned char tmp;
- int i;
- int ret = 0;
-
if (__read_long (&n_counts, da_file, 8) != 0)
{
for (i = 0; i < n_counts; i++)
{
long v = 0;
- unsigned char tmp;
- int j;
- int ret = 0;
if (__read_long (&v, da_file, 8) != 0)
{
fprintf (stderr, "arc profiling: Error closing output file %s.\n",
ptr->filename);
}
- if ((da_file = fopen (ptr->filename, "w")) < 0)
+ if ((da_file = fopen (ptr->filename, "w")) == 0)
{
fprintf (stderr, "arc profiling: Can't open output file %s.\n",
ptr->filename);
#define MACHINE_STATE_RESTORE(ID)
#endif
-#include <string.h>
-
/* Number of buckets in hashtable of basic block addresses. */
#define BB_BUCKETS 311
{
FILE *file = fopen ("bb.out", "a");
struct bb_func *f;
- struct bb_edge *e;
struct bb *b;
if (!file)
{
for (ptr = bb_head; ptr != (struct bb *) 0; ptr = ptr->next)
{
- if (!ptr->filename || p->filename != (char *) 0 && strcmp (p->filename, ptr->filename))
+ if (!ptr->filename || (p->filename != (char *) 0 && strcmp (p->filename, ptr->filename)))
continue;
for (blk = 0; blk < ptr->ncounts; blk++)
{
for ( ; bucket; bucket = bucket->next )
{
fprintf (file, "Jump from block 0x%.*lx to "
- "block 0x%.*lx executed %*d time(s)\n",
+ "block 0x%.*lx executed %*lu time(s)\n",
addr_len, bucket->src_addr,
addr_len, bucket->dst_addr,
cnt_len, bucket->count);
{
unsigned long l;
f->next = bb_func_head;
- if (pos = strchr (p, ':'))
+ if ((pos = strchr (p, ':')))
{
if (!(f->funcname = (char *) malloc (strlen (pos+1)+1)))
continue;
bb_hashbuckets = (struct bb_edge **)
malloc (BB_BUCKETS * sizeof (struct bb_edge *));
if (bb_hashbuckets)
- bzero ((char *) bb_hashbuckets, BB_BUCKETS);
+ memset (bb_hashbuckets, 0, BB_BUCKETS * sizeof (struct bb_edge *));
}
if (bb_mode & 12)
/* Jump to a trampoline, loading the static chain address. */
-#if defined(WINNT) && ! defined(__CYGWIN32__)
+#if defined(WINNT) && ! defined(__CYGWIN__)
long getpagesize()
{
#endif /* __sysV88__ */
+#ifdef __sysV68__
+
+#include <sys/signal.h>
+#include <errno.h>
+
+/* Motorola forgot to put memctl.o in the libp version of libc881.a,
+ so define it here, because we need it in __clear_insn_cache below */
+/* On older versions of this OS, no memctl or MCT_TEXT are defined;
+ hence we enable this stuff only if MCT_TEXT is #define'd. */
+
+#ifdef MCT_TEXT
+asm("\n\
+ global memctl\n\
+memctl:\n\
+ movq &75,%d0\n\
+ trap &0\n\
+ bcc.b noerror\n\
+ jmp cerror%\n\
+noerror:\n\
+ movq &0,%d0\n\
+ rts");
+#endif
+
+/* Clear instruction cache so we can call trampolines on stack.
+ This is called from FINALIZE_TRAMPOLINE in mot3300.h. */
+
+void
+__clear_insn_cache ()
+{
+#ifdef MCT_TEXT
+ int save_errno;
+
+ /* Preserve errno, because users would be surprised to have
+ errno changing without explicitly calling any system-call. */
+ save_errno = errno;
+
+ /* Keep it simple : memctl (MCT_TEXT) always fully clears the insn cache.
+ No need to use an address derived from _start or %sp, as 0 works also. */
+ memctl(0, 4096, MCT_TEXT);
+ errno = save_errno;
+#endif
+}
+
+#endif /* __sysV68__ */
+
#ifdef __pyr__
#undef NULL /* Avoid errors if stdio.h and our stddef.h mismatch. */
#endif /* sony_news */
#endif /* L_trampoline */
\f
+#ifndef __CYGWIN__
#ifdef L__main
#include "gbl-ctors.h"
#endif /* no HAS_INIT_SECTION or INVOKE__main */
#endif /* L__main */
+#endif /* __CYGWIN__ */
\f
#ifdef L_ctors
#else /* No NEED_ATEXIT */
__do_global_dtors ();
#endif /* No NEED_ATEXIT */
-#endif
+#endif /* !defined (INIT_SECTION_ASM_OP) || !defined (OBJECT_FORMAT_ELF) */
+/* In gbl-ctors.h, ON_EXIT is defined if HAVE_ATEXIT is defined. In
+ __bb_init_func and _bb_init_prg, __bb_exit_func is registered with
+ ON_EXIT if ON_EXIT is defined. Thus we must not call __bb_exit_func here
+ if HAVE_ATEXIT is defined. */
+#ifndef HAVE_ATEXIT
#ifndef inhibit_libc
__bb_exit_func ();
#endif
+#endif /* !HAVE_ATEXIT */
#ifdef EXIT_BODY
EXIT_BODY;
#else
_exit (status);
}
-#else
+#else /* ON_EXIT defined */
int _exit_dummy_decl = 0; /* prevent compiler & linker warnings */
-#endif
+
+# ifndef HAVE_ATEXIT
+/* Provide a fake for atexit() using ON_EXIT. */
+int atexit (func_ptr func)
+{
+ return ON_EXIT (func, NULL);
+}
+# endif /* HAVE_ATEXIT */
+#endif /* ON_EXIT defined */
#endif /* L_exit */
\f
#ifdef L_eh
+#include "gthr.h"
+
/* Shared exception handling support routines. */
-/* Language-specific information about the active exception(s). If there
- are no active exceptions, it is set to 0. */
-void *__eh_info;
+extern void __default_terminate (void) __attribute__ ((__noreturn__));
void
__default_terminate ()
{
}
\f
+
+/* Include definitions of EH context and table layout */
+
+#include "eh-common.h"
+#ifndef inhibit_libc
+#include <stdio.h>
+#endif
+
+/* Allocate and return a new EH context structure. */
+
+extern void __throw ();
+
+static void *
+new_eh_context ()
+{
+ struct eh_full_context {
+ struct eh_context c;
+ void *top_elt[2];
+ } *ehfc = (struct eh_full_context *) malloc (sizeof *ehfc);
+
+ if (! ehfc)
+ __terminate ();
+
+ memset (ehfc, 0, sizeof *ehfc);
+
+ ehfc->c.dynamic_handler_chain = (void **) ehfc->top_elt;
+
+ /* This should optimize out entirely. This should always be true,
+ but just in case it ever isn't, don't allow bogus code to be
+ generated. */
+
+ if ((void*)(&ehfc->c) != (void*)ehfc)
+ __terminate ();
+
+ return &ehfc->c;
+}
+
+#if __GTHREADS
+static __gthread_key_t eh_context_key;
+
+/* Destructor for struct eh_context. */
+static void
+eh_context_free (void *ptr)
+{
+ __gthread_key_dtor (eh_context_key, ptr);
+ if (ptr)
+ free (ptr);
+}
+#endif
+
+/* Pointer to function to return EH context. */
+
+static struct eh_context *eh_context_initialize ();
+static struct eh_context *eh_context_static ();
+#if __GTHREADS
+static struct eh_context *eh_context_specific ();
+#endif
+
+static struct eh_context *(*get_eh_context) () = &eh_context_initialize;
+
+/* Routine to get EH context.
+ This one will simply call the function pointer. */
+
+void *
+__get_eh_context ()
+{
+ return (void *) (*get_eh_context) ();
+}
+
+/* Get and set the language specific info pointer. */
+
+void **
+__get_eh_info ()
+{
+ struct eh_context *eh = (*get_eh_context) ();
+ return &eh->info;
+}
+\f
+#if __GTHREADS
+static void
+eh_threads_initialize ()
+{
+ /* Try to create the key. If it fails, revert to static method,
+ otherwise start using thread specific EH contexts. */
+ if (__gthread_key_create (&eh_context_key, &eh_context_free) == 0)
+ get_eh_context = &eh_context_specific;
+ else
+ get_eh_context = &eh_context_static;
+}
+#endif /* no __GTHREADS */
+
+/* Initialize EH context.
+ This will be called only once, since we change GET_EH_CONTEXT
+ pointer to another routine. */
+
+static struct eh_context *
+eh_context_initialize ()
+{
+#if __GTHREADS
+
+ static __gthread_once_t once = __GTHREAD_ONCE_INIT;
+ /* Make sure that get_eh_context does not point to us anymore.
+ Some systems have dummy thread routines in their libc that
+ return a success (Solaris 2.6 for example). */
+ if (__gthread_once (&once, eh_threads_initialize) != 0
+ || get_eh_context == &eh_context_initialize)
+ {
+ /* Use static version of EH context. */
+ get_eh_context = &eh_context_static;
+ }
+
+#else /* no __GTHREADS */
+
+ /* Use static version of EH context. */
+ get_eh_context = &eh_context_static;
+
+#endif /* no __GTHREADS */
+
+ return (*get_eh_context) ();
+}
+
+/* Return a static EH context. */
+
+static struct eh_context *
+eh_context_static ()
+{
+ static struct eh_context eh;
+ static int initialized;
+ static void *top_elt[2];
+
+ if (! initialized)
+ {
+ initialized = 1;
+ memset (&eh, 0, sizeof eh);
+ eh.dynamic_handler_chain = top_elt;
+ }
+ return &eh;
+}
+
+#if __GTHREADS
+/* Return a thread specific EH context. */
+
+static struct eh_context *
+eh_context_specific ()
+{
+ struct eh_context *eh;
+ eh = (struct eh_context *) __gthread_getspecific (eh_context_key);
+ if (! eh)
+ {
+ eh = new_eh_context ();
+ if (__gthread_setspecific (eh_context_key, (void *) eh) != 0)
+ __terminate ();
+ }
+
+ return eh;
+}
+#endif __GTHREADS
+\f
/* Support routines for setjmp/longjmp exception handling. */
/* Calls to __sjthrow are generated by the compiler when an exception
is raised when using the setjmp/longjmp exception handling codegen
method. */
+#ifdef DONT_USE_BUILTIN_SETJMP
extern void longjmp (void *, int);
-
-static void *top_elt[2];
-void **__dynamic_handler_chain = top_elt;
+#endif
/* Routine to get the head of the current thread's dynamic handler chain
- use for exception handling.
-
- TODO: make thread safe. */
+ use for exception handling. */
void ***
__get_dynamic_handler_chain ()
{
- return &__dynamic_handler_chain;
+ struct eh_context *eh = (*get_eh_context) ();
+ return &eh->dynamic_handler_chain;
}
/* This is used to throw an exception when the setjmp/longjmp codegen
method is used for exception handling.
- We call __terminate if there are no handlers left (we know this
- when the dynamic handler chain is top_elt). Otherwise we run the
- cleanup actions off the dynamic cleanup stack, and pop the top of
- the dynamic handler chain, and use longjmp to transfer back to the
- associated handler. */
+ We call __terminate if there are no handlers left. Otherwise we run the
+ cleanup actions off the dynamic cleanup stack, and pop the top of the
+ dynamic handler chain, and use longjmp to transfer back to the associated
+ handler. */
+
+extern void __sjthrow (void) __attribute__ ((__noreturn__));
void
__sjthrow ()
{
- void ***dhc = __get_dynamic_handler_chain ();
+ struct eh_context *eh = (*get_eh_context) ();
+ void ***dhc = &eh->dynamic_handler_chain;
void *jmpbuf;
void (*func)(void *, int);
void *arg;
/* We must call terminate if we try and rethrow an exception, when
there is no exception currently active and when there are no
handlers left. */
- if (! __eh_info || (*dhc) == top_elt)
+ if (! eh->info || (*dhc)[0] == 0)
__terminate ();
/* Find the jmpbuf associated with the top element of the dynamic
then throw. This is used to skip the first handler, and transfer
control to the next handler in the dynamic handler stack. */
+extern void __sjpopnthrow (void) __attribute__ ((__noreturn__));
+
void
__sjpopnthrow ()
{
- void ***dhc = __get_dynamic_handler_chain ();
- void *jmpbuf;
+ struct eh_context *eh = (*get_eh_context) ();
+ void ***dhc = &eh->dynamic_handler_chain;
void (*func)(void *, int);
void *arg;
void ***cleanup;
\f
/* Support code for all exception region-based exception handling. */
+int
+__eh_rtime_match (void *rtime)
+{
+ void *info;
+ __eh_matcher matcher;
+ void *ret;
+
+ info = *(__get_eh_info ());
+ matcher = ((__eh_info *)info)->match_function;
+ if (! matcher)
+ {
+#ifndef inhibit_libc
+ fprintf (stderr, "Internal Compiler Bug: No runtime type matcher.");
+#endif
+ return 0;
+ }
+ ret = (*matcher) (info, rtime, (void *)0);
+ return (ret != NULL);
+}
+
/* This value identifies the place from which an exception is being
thrown. */
#else
-typedef struct exception_table {
- void *start;
- void *end;
- void *exception_handler;
-} exception_table;
+#ifdef DWARF2_UNWIND_INFO
+
+
+/* Return the table version of an exception descriptor */
+
+short
+__get_eh_table_version (exception_descriptor *table)
+{
+ return table->lang.version;
+}
+
+/* Return the originating table language of an exception descriptor */
+
+short
+__get_eh_table_language (exception_descriptor *table)
+{
+ return table->lang.language;
+}
/* This routine takes a PC and a pointer to the exception region TABLE for
its translation unit, and returns the address of the exception handler
an inner block. */
static void *
-find_exception_handler (void *pc, exception_table *table)
+old_find_exception_handler (void *pc, old_exception_table *table)
{
if (table)
{
int best = -1;
/* We can't do a binary search because the table isn't guaranteed
- to be sorted from function to function. */
- for (pos = 0; table[pos].exception_handler != (void *) -1; ++pos)
- {
- if (table[pos].start <= pc && table[pos].end > pc)
- {
- /* This can apply. Make sure it is at least as small as
- the previous best. */
- if (best == -1 || (table[pos].end <= table[best].end
- && table[pos].start >= table[best].start))
- best = pos;
- }
- /* But it is sorted by starting PC within a function. */
- else if (best >= 0 && table[pos].start > pc)
- break;
- }
+ to be sorted from function to function. */
+ for (pos = 0; table[pos].start_region != (void *) -1; ++pos)
+ {
+ if (table[pos].start_region <= pc && table[pos].end_region > pc)
+ {
+ /* This can apply. Make sure it is at least as small as
+ the previous best. */
+ if (best == -1 || (table[pos].end_region <= table[best].end_region
+ && table[pos].start_region >= table[best].start_region))
+ best = pos;
+ }
+ /* But it is sorted by starting PC within a function. */
+ else if (best >= 0 && table[pos].start_region > pc)
+ break;
+ }
if (best != -1)
- return table[best].exception_handler;
+ return table[best].exception_handler;
}
return (void *) 0;
}
-#endif /* EH_TABLE_LOOKUP */
-\f
-#ifndef DWARF2_UNWIND_INFO
-/* Support code for exception handling using inline unwinders or
- __unwind_function. */
-
-void *__eh_pc;
-
-#ifndef EH_TABLE_LOOKUP
-typedef struct exception_table_node {
- exception_table *table;
- void *start;
- void *end;
- struct exception_table_node *next;
-} exception_table_node;
-
-static struct exception_table_node *exception_table_list;
-void *
-__find_first_exception_table_match (void *pc)
+/* find_exception_handler finds the correct handler, if there is one, to
+ handle an exception.
+ returns a pointer to the handler which controlled should be transferred
+ to, or NULL if there is nothing left.
+ Parameters:
+ PC - pc where the exception originates. If this is a rethrow,
+ then this starts out as a pointer to the exception table
+ entry we wish to rethrow out of.
+ TABLE - exception table for the current module.
+ EH_INFO - eh info pointer for this exception.
+ RETHROW - 1 if this is a rethrow. (see incoming value of PC).
+ CLEANUP - returned flag indicating whether this is a cleanup handler.
+*/
+static void *
+find_exception_handler (void *pc, exception_descriptor *table,
+ __eh_info *eh_info, int rethrow, int *cleanup)
{
- register exception_table_node *tnp;
- for (tnp = exception_table_list; tnp != 0; tnp = tnp->next)
+ void *retval = NULL;
+ *cleanup = 1;
+ if (table)
{
- if (tnp->start <= pc && tnp->end >= pc)
- return find_exception_handler (pc, tnp->table);
- }
+ int pos = 0;
+ /* The new model assumed the table is sorted inner-most out so the
+ first region we find which matches is the correct one */
- return (void *) 0;
-}
-
-void
-__register_exceptions (exception_table *table)
-{
- exception_table_node *node;
- exception_table *range = table + 1;
-
- if (range->start == (void *) -1)
- return;
+ exception_table *tab = &(table->table[0]);
- node = (exception_table_node *) malloc (sizeof (exception_table_node));
- node->table = table;
-
- /* This look can be optimized away either if the table
- is sorted, or if we pass in extra parameters. */
- node->start = range->start;
- node->end = range->end;
- for (range++ ; range->start != (void *) (-1); range++)
- {
- if (range->start < node->start)
- node->start = range->start;
- if (range->end > node->end)
- node->end = range->end;
+ /* Subtract 1 from the PC to avoid hitting the next region */
+ if (rethrow)
+ {
+ /* pc is actually the region table entry to rethrow out of */
+ pos = ((exception_table *) pc) - tab;
+ pc = ((exception_table *) pc)->end_region - 1;
+
+ /* The label is always on the LAST handler entry for a region,
+ so we know the next entry is a different region, even if the
+ addresses are the same. Make sure its not end of table tho. */
+ if (tab[pos].start_region != (void *) -1)
+ pos++;
+ }
+ else
+ pc--;
+
+ /* We can't do a binary search because the table is in inner-most
+ to outermost address ranges within functions */
+ for ( ; tab[pos].start_region != (void *) -1; pos++)
+ {
+ if (tab[pos].start_region <= pc && tab[pos].end_region > pc)
+ {
+ if (tab[pos].match_info)
+ {
+ __eh_matcher matcher = eh_info->match_function;
+ /* match info but no matcher is NOT a match */
+ if (matcher)
+ {
+ void *ret = (*matcher)((void *) eh_info,
+ tab[pos].match_info, table);
+ if (ret)
+ {
+ if (retval == NULL)
+ retval = tab[pos].exception_handler;
+ *cleanup = 0;
+ break;
+ }
+ }
+ }
+ else
+ {
+ if (retval == NULL)
+ retval = tab[pos].exception_handler;
+ }
+ }
+ }
}
-
- node->next = exception_table_list;
- exception_table_list = node;
-}
-#endif /* !EH_TABLE_LOOKUP */
-
-/* Throw stub routine.
-
- This is work in progress, but not completed yet. */
-
-void
-__throw ()
-{
- abort ();
-}
-
-/* See expand_builtin_throw for details. */
-
-void **__eh_pcnthrow () {
- static void *buf[2] = {
- &__eh_pc,
- &__throw
- };
- return buf;
-}
-
-#if #machine(i386)
-void
-__unwind_function(void *ptr)
-{
- asm("movl 8(%esp),%ecx");
- /* Undo current frame */
- asm("movl %ebp,%esp");
- asm("popl %ebp");
- /* like ret, but stay here */
- asm("addl $4,%esp");
-
- /* Now, undo previous frame. */
- /* This is a test routine, as we have to dynamically probe to find out
- what to pop for certain, this is just a guess. */
- asm("leal -16(%ebp),%esp");
- asm("pop %ebx");
- asm("pop %esi");
- asm("pop %edi");
- asm("movl %ebp,%esp");
- asm("popl %ebp");
-
- asm("movl %ecx,0(%esp)");
- asm("ret");
-}
-#elif #machine(rs6000) && !defined _ARCH_PPC
-__unwind_function(void *ptr)
-{
- asm("mr 31,1");
- asm("l 1,0(1)");
- asm("l 31,-4(1)");
- asm("# br");
-
- asm("mr 31,1");
- asm("l 1,0(1)");
- /* use 31 as a scratch register to restore the link register. */
- asm("l 31, 8(1);mtlr 31 # l lr,8(1)");
- asm("l 31,-4(1)");
- asm("# br");
- asm("mtctr 3;bctr # b 3");
-}
-#elif (#machine(rs6000) || #machine(powerpc)) && defined _ARCH_PPC
-__unwind_function(void *ptr)
-{
- asm("mr 31,1");
- asm("lwz 1,0(1)");
- asm("lwz 31,-4(1)");
- asm("# br");
-
- asm("mr 31,1");
- asm("lwz 1,0(1)");
- /* use 31 as a scratch register to restore the link register. */
- asm("lwz 31, 8(1);mtlr 31 # l lr,8(1)");
- asm("lwz 31,-4(1)");
- asm("# br");
- asm("mtctr 3;bctr # b 3");
-}
-#elif #machine(vax)
-__unwind_function(void *ptr)
-{
- __label__ return_again;
-
- /* Replace our frame's return address with the label below.
- During execution, we will first return here instead of to
- caller, then second return takes caller's frame off the stack.
- Two returns matches two actual calls, so is less likely to
- confuse debuggers. `16' corresponds to RETURN_ADDRESS_OFFSET. */
- __asm ("movl %0,16(fp)" : : "p" (&& return_again));
- return;
-
- return_again:
- return;
-}
-#else
-__unwind_function(void *ptr)
-{
- abort ();
+ return retval;
}
-#endif /* powerpc */
+#endif /* DWARF2_UNWIND_INFO */
+#endif /* EH_TABLE_LOOKUP */
\f
-#else /* DWARF2_UNWIND_INFO */
+#ifdef DWARF2_UNWIND_INFO
/* Support code for exception handling using static unwind information. */
#include "frame.h"
typedef int ptr_type __attribute__ ((mode (pointer)));
-/* Get the value of register REG as saved in UDATA, where SUB_UDATA is a
+#ifdef INCOMING_REGNO
+/* Is the saved value for register REG in frame UDATA stored in a register
+ window in the previous frame? */
+
+/* ??? The Sparc INCOMING_REGNO references TARGET_FLAT. This allows us
+ to use the macro here. One wonders, though, that perhaps TARGET_FLAT
+ compiled functions won't work with the frame-unwind stuff here.
+ Perhaps the entireity of in_reg_window should be conditional on having
+ seen a DW_CFA_GNU_window_save? */
+#define target_flags 0
+
+static int
+in_reg_window (int reg, frame_state *udata)
+{
+ if (udata->saved[reg] == REG_SAVED_REG)
+ return INCOMING_REGNO (reg) == reg;
+ if (udata->saved[reg] != REG_SAVED_OFFSET)
+ return 0;
+
+#ifdef STACK_GROWS_DOWNWARD
+ return udata->reg_or_offset[reg] > 0;
+#else
+ return udata->reg_or_offset[reg] < 0;
+#endif
+}
+#else
+static inline int in_reg_window (int reg, frame_state *udata) { return 0; }
+#endif /* INCOMING_REGNO */
+
+/* Get the address of register REG as saved in UDATA, where SUB_UDATA is a
frame called by UDATA or 0. */
-static void*
-get_reg (unsigned reg, frame_state *udata, frame_state *sub_udata)
+static word_type *
+get_reg_addr (unsigned reg, frame_state *udata, frame_state *sub_udata)
{
+ while (udata->saved[reg] == REG_SAVED_REG)
+ {
+ reg = udata->reg_or_offset[reg];
+ if (in_reg_window (reg, udata))
+ {
+ udata = sub_udata;
+ sub_udata = NULL;
+ }
+ }
if (udata->saved[reg] == REG_SAVED_OFFSET)
- return (void *)(ptr_type)
- *(word_type *)(udata->cfa + udata->reg_or_offset[reg]);
- else if (udata->saved[reg] == REG_SAVED_REG && sub_udata)
- return get_reg (udata->reg_or_offset[reg], sub_udata, 0);
+ return (word_type *)(udata->cfa + udata->reg_or_offset[reg]);
else
abort ();
}
+/* Get the value of register REG as saved in UDATA, where SUB_UDATA is a
+ frame called by UDATA or 0. */
+
+static inline void *
+get_reg (unsigned reg, frame_state *udata, frame_state *sub_udata)
+{
+ return (void *)(ptr_type) *get_reg_addr (reg, udata, sub_udata);
+}
+
/* Overwrite the saved value for register REG in frame UDATA with VAL. */
-static void
+static inline void
put_reg (unsigned reg, void *val, frame_state *udata)
{
- if (udata->saved[reg] == REG_SAVED_OFFSET)
- *(word_type *)(udata->cfa + udata->reg_or_offset[reg])
- = (word_type)(ptr_type) val;
- else
- abort ();
+ *get_reg_addr (reg, udata, NULL) = (word_type)(ptr_type) val;
}
/* Copy the saved value for register REG from frame UDATA to frame
static void
copy_reg (unsigned reg, frame_state *udata, frame_state *target_udata)
{
- if (udata->saved[reg] == REG_SAVED_OFFSET
- && target_udata->saved[reg] == REG_SAVED_OFFSET)
- memcpy (target_udata->cfa + target_udata->reg_or_offset[reg],
- udata->cfa + udata->reg_or_offset[reg],
- __builtin_dwarf_reg_size (reg));
- else
- abort ();
+ word_type *preg = get_reg_addr (reg, udata, NULL);
+ word_type *ptreg = get_reg_addr (reg, target_udata, NULL);
+
+ memcpy (ptreg, preg, __builtin_dwarf_reg_size (reg));
}
-/* Retrieve the return address for frame UDATA, where SUB_UDATA is a
- frame called by UDATA or 0. */
+/* Retrieve the return address for frame UDATA. */
static inline void *
get_return_addr (frame_state *udata, frame_state *sub_udata)
return caller_udata;
}
-#ifdef INCOMING_REGNO
-/* Is the saved value for register REG in frame UDATA stored in a register
- window in the previous frame? */
-
-static int
-in_reg_window (int reg, frame_state *udata)
+/* Hook to call before __terminate if only cleanup handlers remain. */
+void
+__unwinding_cleanup ()
{
- if (udata->saved[reg] != REG_SAVED_OFFSET)
- return 0;
-
-#ifdef STACK_GROWS_DOWNWARD
- return udata->reg_or_offset[reg] > 0;
-#else
- return udata->reg_or_offset[reg] < 0;
-#endif
}
-#endif /* INCOMING_REGNO */
-
-/* We first search for an exception handler, and if we don't find
- it, we call __terminate on the current stack frame so that we may
- use the debugger to walk the stack and understand why no handler
- was found.
-
- If we find one, then we unwind the frames down to the one that
- has the handler and transfer control into the handler. */
-
-void
-__throw ()
-{
- void *pc, *handler, *retaddr, *__eh_pc;
- frame_state ustruct, ustruct2;
- frame_state *udata = &ustruct;
- frame_state *sub_udata = &ustruct2;
- frame_state my_ustruct, *my_udata = &my_ustruct;
- long args_size;
-
- /* This is required for C++ semantics. We must call terminate if we
- try and rethrow an exception, when there is no exception currently
- active. */
- if (! __eh_info)
- __terminate ();
-
- /* Start at our stack frame. */
-label:
- udata = __frame_state_for (&&label, udata);
- if (! udata)
- __terminate ();
-
- /* We need to get the value from the CFA register. At this point in
- compiling __throw we don't know whether or not we will use the frame
- pointer register for the CFA, so we check our unwind info. */
- if (udata->cfa_reg == __builtin_dwarf_fp_regnum ())
- udata->cfa = __builtin_fp ();
- else
- udata->cfa = __builtin_sp ();
- udata->cfa += udata->cfa_offset;
-
- memcpy (my_udata, udata, sizeof (*udata));
-
- /* Do any necessary initialization to access arbitrary stack frames.
- On the SPARC, this means flushing the register windows. */
- __builtin_unwind_init ();
- /* Now reset pc to the right throw point. */
- __eh_pc = __builtin_extract_return_addr (__builtin_return_address (0)) - 1;
- pc = __eh_pc;
+/* throw_helper performs some of the common grunt work for a throw. This
+ routine is called by throw and rethrows. This is pretty much split
+ out from the old __throw routine. An addition has been added which allows
+ for a dummy call to a routine __unwinding_cleanup() when there are nothing
+ but cleanups remaining. This allows a debugger to examine the state
+ at which the throw was executed, before any cleanups, rather than
+ at the terminate point after the stack has been unwound. */
- handler = 0;
+static void *
+throw_helper (eh, pc, my_udata, udata_p)
+ struct eh_context *eh;
+ void *pc;
+ frame_state *my_udata;
+ frame_state **udata_p;
+{
+ frame_state *udata = *udata_p;
+ frame_state ustruct;
+ frame_state *sub_udata = &ustruct;
+ void *saved_pc = pc;
+ void *handler;
+ void *handler_p;
+ void *pc_p;
+ frame_state saved_ustruct;
+ int new_eh_model;
+ int cleanup = 0;
+ int only_cleanup = 0;
+ int rethrow = 0;
+ int saved_state = 0;
+ __eh_info *eh_info = (__eh_info *)eh->info;
+
+ /* Do we find a handler based on a re-throw PC? */
+ if (eh->table_index != (void *) 0)
+ rethrow = 1;
+
+ handler = (void *) 0;
for (;;)
{
frame_state *p = udata;
if (! udata)
break;
- handler = find_exception_handler (pc, udata->eh_ptr);
+ if (udata->eh_ptr == NULL)
+ new_eh_model = 0;
+ else
+ new_eh_model = (((exception_descriptor *)(udata->eh_ptr))->
+ runtime_id_field == NEW_EH_RUNTIME);
- /* If we found one, we can stop searching. */
+ if (rethrow)
+ {
+ rethrow = 0;
+ handler = find_exception_handler (eh->table_index, udata->eh_ptr,
+ eh_info, 1, &cleanup);
+ eh->table_index = (void *)0;
+ }
+ else
+ if (new_eh_model)
+ handler = find_exception_handler (pc, udata->eh_ptr, eh_info,
+ 0, &cleanup);
+ else
+ handler = old_find_exception_handler (pc, udata->eh_ptr);
+
+ /* If we found one, we can stop searching, if its not a cleanup.
+ for cleanups, we save the state, and keep looking. This allows
+ us to call a debug hook if there are nothing but cleanups left. */
if (handler)
- {
- args_size = udata->args_size;
- break;
- }
+ if (cleanup)
+ {
+ if (!saved_state)
+ {
+ saved_ustruct = *udata;
+ handler_p = handler;
+ pc_p = pc;
+ saved_state = 1;
+ only_cleanup = 1;
+ }
+ }
+ else
+ {
+ only_cleanup = 0;
+ break;
+ }
/* Otherwise, we continue searching. We subtract 1 from PC to avoid
hitting the beginning of the next region. */
pc = get_return_addr (udata, sub_udata) - 1;
}
+ if (saved_state)
+ {
+ udata = &saved_ustruct;
+ handler = handler_p;
+ pc = pc_p;
+ if (only_cleanup)
+ __unwinding_cleanup ();
+ }
+
/* If we haven't found a handler by now, this is an unhandled
exception. */
- if (! handler)
- __terminate ();
+ if (! handler)
+ __terminate();
+
+ eh->handler_label = handler;
- if (pc == __eh_pc)
+ if (pc == saved_pc)
/* We found a handler in the throw context, no need to unwind. */
udata = my_udata;
else
{
int i;
- void *val;
/* Unwind all the frames between this one and the handler by copying
their saved register values into our register save slots. */
void *handler_pc = pc;
/* Start from the throw context again. */
- pc = __eh_pc;
+ pc = saved_pc;
memcpy (udata, my_udata, sizeof (*udata));
while (pc != handler_pc)
for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i)
if (i != udata->retaddr_column && udata->saved[i])
{
-#ifdef INCOMING_REGNO
/* If you modify the saved value of the return address
register on the SPARC, you modify the return address for
your caller's frame. Don't do that here, as it will
&& udata->saved[udata->retaddr_column] == REG_SAVED_REG
&& udata->reg_or_offset[udata->retaddr_column] == i)
continue;
-#endif
copy_reg (i, udata, my_udata);
}
pc = get_return_addr (udata, sub_udata) - 1;
}
-#ifdef INCOMING_REGNO
/* But we do need to update the saved return address register from
the last frame we unwind, or the handler frame will have the wrong
return address. */
if (in_reg_window (i, udata))
copy_reg (i, udata, my_udata);
}
-#endif
}
/* udata now refers to the frame called by the handler frame. */
- /* Emit the stub to adjust sp and jump to the handler. */
- retaddr = __builtin_eh_stub ();
+ *udata_p = udata;
+ return handler;
+}
- /* And then set our return address to point to the stub. */
- if (my_udata->saved[my_udata->retaddr_column] == REG_SAVED_OFFSET)
- put_return_addr (retaddr, my_udata);
- else
- __builtin_set_return_addr_reg (retaddr);
- /* Set up the registers we use to communicate with the stub.
- We check STACK_GROWS_DOWNWARD so the stub can use adjust_stack. */
- __builtin_set_eh_regs (handler,
+/* We first search for an exception handler, and if we don't find
+ it, we call __terminate on the current stack frame so that we may
+ use the debugger to walk the stack and understand why no handler
+ was found.
+
+ If we find one, then we unwind the frames down to the one that
+ has the handler and transfer control into the handler. */
+
+/*extern void __throw(void) __attribute__ ((__noreturn__));*/
+
+void
+__throw ()
+{
+ struct eh_context *eh = (*get_eh_context) ();
+ void *pc, *handler;
+ frame_state ustruct;
+ frame_state *udata = &ustruct;
+ frame_state my_ustruct, *my_udata = &my_ustruct;
+
+ /* This is required for C++ semantics. We must call terminate if we
+ try and rethrow an exception, when there is no exception currently
+ active. */
+ if (! eh->info)
+ __terminate ();
+
+ /* Start at our stack frame. */
+label:
+ udata = __frame_state_for (&&label, udata);
+ if (! udata)
+ __terminate ();
+
+ /* We need to get the value from the CFA register. */
+ udata->cfa = __builtin_dwarf_cfa ();
+
+ memcpy (my_udata, udata, sizeof (*udata));
+
+ /* Do any necessary initialization to access arbitrary stack frames.
+ On the SPARC, this means flushing the register windows. */
+ __builtin_unwind_init ();
+
+ /* Now reset pc to the right throw point. */
+ pc = __builtin_extract_return_addr (__builtin_return_address (0)) - 1;
+
+ handler = throw_helper (eh, pc, my_udata, &udata);
+
+ /* Now go! */
+
+ __builtin_eh_return ((void *)eh,
+#ifdef STACK_GROWS_DOWNWARD
+ udata->cfa - my_udata->cfa,
+#else
+ my_udata->cfa - udata->cfa,
+#endif
+ handler);
+
+ /* Epilogue: restore the handler frame's register values and return
+ to the stub. */
+}
+
+/*extern void __rethrow(void *) __attribute__ ((__noreturn__));*/
+
+void
+__rethrow (index)
+ void *index;
+{
+ struct eh_context *eh = (*get_eh_context) ();
+ void *pc, *handler;
+ frame_state ustruct;
+ frame_state *udata = &ustruct;
+ frame_state my_ustruct, *my_udata = &my_ustruct;
+
+ /* This is required for C++ semantics. We must call terminate if we
+ try and rethrow an exception, when there is no exception currently
+ active. */
+ if (! eh->info)
+ __terminate ();
+
+ /* This is the table index we want to rethrow from. The value of
+ the END_REGION label is used for the PC of the throw, and the
+ search begins with the next table entry. */
+ eh->table_index = index;
+
+ /* Start at our stack frame. */
+label:
+ udata = __frame_state_for (&&label, udata);
+ if (! udata)
+ __terminate ();
+
+ /* We need to get the value from the CFA register. */
+ udata->cfa = __builtin_dwarf_cfa ();
+
+ memcpy (my_udata, udata, sizeof (*udata));
+
+ /* Do any necessary initialization to access arbitrary stack frames.
+ On the SPARC, this means flushing the register windows. */
+ __builtin_unwind_init ();
+
+ /* Now reset pc to the right throw point. */
+ pc = __builtin_extract_return_addr (__builtin_return_address (0)) - 1;
+
+ handler = throw_helper (eh, pc, my_udata, &udata);
+
+ /* Now go! */
+
+ __builtin_eh_return ((void *)eh,
#ifdef STACK_GROWS_DOWNWARD
- udata->cfa - my_udata->cfa
+ udata->cfa - my_udata->cfa,
#else
- my_udata->cfa - udata->cfa
+ my_udata->cfa - udata->cfa,
#endif
- + args_size
- );
+ handler);
/* Epilogue: restore the handler frame's register values and return
to the stub. */
}
-#endif /* !DWARF2_UNWIND_INFO */
+#endif /* DWARF2_UNWIND_INFO */
#endif /* L_eh */
\f
#ifndef inhibit_libc
write (2, MESSAGE, sizeof (MESSAGE) - 1);
#endif
- _exit (-1);
+ __terminate ();
}
#endif
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