# include <signal.h>
# endif
+#if defined(LINUX) || defined(LINUX_STACKBOTTOM)
+# include <ctype.h>
+#endif
+
/* Blatantly OS dependent routines, except for those that are related */
/* to dynamic loading. */
-# if !defined(THREADS) && !defined(STACKBOTTOM) && defined(HEURISTIC2)
+# if defined(HEURISTIC2) || defined(SEARCH_FOR_DATA_START)
# define NEED_FIND_LIMIT
# endif
-# if defined(IRIX_THREADS) || defined(HPUX_THREADS)
+# if !defined(STACKBOTTOM) && defined(HEURISTIC2)
# define NEED_FIND_LIMIT
# endif
# define NEED_FIND_LIMIT
# endif
-# if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
+# if (defined(SVR4) || defined(AUX) || defined(DGUX) \
+ || (defined(LINUX) && defined(SPARC))) && !defined(PCR)
# define NEED_FIND_LIMIT
# endif
-# if defined(LINUX) && \
- (defined(POWERPC) || defined(SPARC) || defined(ALPHA) || defined(IA64) \
- || defined(MIPS))
-# define NEED_FIND_LIMIT
-# endif
+#if defined(FREEBSD) && (defined(I386) || defined(X86_64) || defined(powerpc) || defined(__powerpc__))
+# include <machine/trap.h>
+# if !defined(PCR)
+# define NEED_FIND_LIMIT
+# endif
+#endif
-#ifdef NEED_FIND_LIMIT
-# include <setjmp.h>
+#if (defined(NETBSD) || defined(OPENBSD)) && defined(__ELF__) \
+ && !defined(NEED_FIND_LIMIT)
+ /* Used by GC_init_netbsd_elf() below. */
+# define NEED_FIND_LIMIT
#endif
-#ifdef FREEBSD
-# include <machine/trap.h>
+#ifdef NEED_FIND_LIMIT
+# include <setjmp.h>
#endif
#ifdef AMIGA
# include <sys/uio.h>
# include <malloc.h> /* for locking */
#endif
-#ifdef USE_MMAP
+#if defined(USE_MMAP) || defined(USE_MUNMAP)
+# ifndef USE_MMAP
+ --> USE_MUNMAP requires USE_MMAP
+# endif
# include <sys/types.h>
# include <sys/mman.h>
# include <sys/stat.h>
+# include <errno.h>
#endif
#ifdef UNIX_LIKE
# include <fcntl.h>
+# if defined(SUNOS5SIGS) && !defined(FREEBSD)
+# include <sys/siginfo.h>
+# endif
+ /* Define SETJMP and friends to be the version that restores */
+ /* the signal mask. */
+# define SETJMP(env) sigsetjmp(env, 1)
+# define LONGJMP(env, val) siglongjmp(env, val)
+# define JMP_BUF sigjmp_buf
+#else
+# define SETJMP(env) setjmp(env)
+# define LONGJMP(env, val) longjmp(env, val)
+# define JMP_BUF jmp_buf
#endif
-#ifdef SUNOS5SIGS
-# include <sys/siginfo.h>
-# undef setjmp
-# undef longjmp
-# define setjmp(env) sigsetjmp(env, 1)
-# define longjmp(env, val) siglongjmp(env, val)
-# define jmp_buf sigjmp_buf
+#ifdef DARWIN
+/* for get_etext and friends */
+#include <mach-o/getsect.h>
#endif
#ifdef DJGPP
# define OPT_PROT_EXEC 0
#endif
+#if defined(LINUX) && \
+ (defined(USE_PROC_FOR_LIBRARIES) || defined(IA64) || !defined(SMALL_CONFIG))
+
+/* We need to parse /proc/self/maps, either to find dynamic libraries, */
+/* and/or to find the register backing store base (IA64). Do it once */
+/* here. */
+
+#define READ read
+
+/* Repeatedly perform a read call until the buffer is filled or */
+/* we encounter EOF. */
+ssize_t GC_repeat_read(int fd, char *buf, size_t count)
+{
+ ssize_t num_read = 0;
+ ssize_t result;
+
+ while (num_read < count) {
+ result = READ(fd, buf + num_read, count - num_read);
+ if (result < 0) return result;
+ if (result == 0) break;
+ num_read += result;
+ }
+ return num_read;
+}
+
+/*
+ * Apply fn to a buffer containing the contents of /proc/self/maps.
+ * Return the result of fn or, if we failed, 0.
+ * We currently do nothing to /proc/self/maps other than simply read
+ * it. This code could be simplified if we could determine its size
+ * ahead of time.
+ */
+
+word GC_apply_to_maps(word (*fn)(char *))
+{
+ int f;
+ int result;
+ size_t maps_size = 4000; /* Initial guess. */
+ static char init_buf[1];
+ static char *maps_buf = init_buf;
+ static size_t maps_buf_sz = 1;
+
+ /* Read /proc/self/maps, growing maps_buf as necessary. */
+ /* Note that we may not allocate conventionally, and */
+ /* thus can't use stdio. */
+ do {
+ if (maps_size >= maps_buf_sz) {
+ /* Grow only by powers of 2, since we leak "too small" buffers. */
+ while (maps_size >= maps_buf_sz) maps_buf_sz *= 2;
+ maps_buf = GC_scratch_alloc(maps_buf_sz);
+ if (maps_buf == 0) return 0;
+ }
+ f = open("/proc/self/maps", O_RDONLY);
+ if (-1 == f) return 0;
+ maps_size = 0;
+ do {
+ result = GC_repeat_read(f, maps_buf, maps_buf_sz-1);
+ if (result <= 0) return 0;
+ maps_size += result;
+ } while (result == maps_buf_sz-1);
+ close(f);
+ } while (maps_size >= maps_buf_sz);
+ maps_buf[maps_size] = '\0';
+
+ /* Apply fn to result. */
+ return fn(maps_buf);
+}
+
+#endif /* Need GC_apply_to_maps */
+
+#if defined(LINUX) && (defined(USE_PROC_FOR_LIBRARIES) || defined(IA64))
+//
+// GC_parse_map_entry parses an entry from /proc/self/maps so we can
+// locate all writable data segments that belong to shared libraries.
+// The format of one of these entries and the fields we care about
+// is as follows:
+// XXXXXXXX-XXXXXXXX r-xp 00000000 30:05 260537 name of mapping...\n
+// ^^^^^^^^ ^^^^^^^^ ^^^^ ^^
+// start end prot maj_dev
+//
+// Note that since about auguat 2003 kernels, the columns no longer have
+// fixed offsets on 64-bit kernels. Hence we no longer rely on fixed offsets
+// anywhere, which is safer anyway.
+//
+
+/*
+ * Assign various fields of the first line in buf_ptr to *start, *end,
+ * *prot_buf and *maj_dev. Only *prot_buf may be set for unwritable maps.
+ */
+char *GC_parse_map_entry(char *buf_ptr, word *start, word *end,
+ char *prot_buf, unsigned int *maj_dev)
+{
+ char *start_start, *end_start, *prot_start, *maj_dev_start;
+ char *p;
+ char *endp;
+
+ if (buf_ptr == NULL || *buf_ptr == '\0') {
+ return NULL;
+ }
+
+ p = buf_ptr;
+ while (isspace(*p)) ++p;
+ start_start = p;
+ GC_ASSERT(isxdigit(*start_start));
+ *start = strtoul(start_start, &endp, 16); p = endp;
+ GC_ASSERT(*p=='-');
+
+ ++p;
+ end_start = p;
+ GC_ASSERT(isxdigit(*end_start));
+ *end = strtoul(end_start, &endp, 16); p = endp;
+ GC_ASSERT(isspace(*p));
+
+ while (isspace(*p)) ++p;
+ prot_start = p;
+ GC_ASSERT(*prot_start == 'r' || *prot_start == '-');
+ memcpy(prot_buf, prot_start, 4);
+ prot_buf[4] = '\0';
+ if (prot_buf[1] == 'w') {/* we can skip the rest if it's not writable. */
+ /* Skip past protection field to offset field */
+ while (!isspace(*p)) ++p; while (isspace(*p)) ++p;
+ GC_ASSERT(isxdigit(*p));
+ /* Skip past offset field, which we ignore */
+ while (!isspace(*p)) ++p; while (isspace(*p)) ++p;
+ maj_dev_start = p;
+ GC_ASSERT(isxdigit(*maj_dev_start));
+ *maj_dev = strtoul(maj_dev_start, NULL, 16);
+ }
+
+ while (*p && *p++ != '\n');
+
+ return p;
+}
+
+#endif /* Need to parse /proc/self/maps. */
+
#if defined(SEARCH_FOR_DATA_START)
/* The I386 case can be handled without a search. The Alpha case */
/* used to be handled differently as well, but the rules changed */
/* cover all versions. */
# ifdef LINUX
+ /* Some Linux distributions arrange to define __data_start. Some */
+ /* define data_start as a weak symbol. The latter is technically */
+ /* broken, since the user program may define data_start, in which */
+ /* case we lose. Nonetheless, we try both, prefering __data_start. */
+ /* We assume gcc-compatible pragmas. */
# pragma weak __data_start
- extern int __data_start;
+ extern int __data_start[];
# pragma weak data_start
- extern int data_start;
+ extern int data_start[];
# endif /* LINUX */
- extern int _end;
+ extern int _end[];
ptr_t GC_data_start;
# ifdef LINUX
/* Try the easy approaches first: */
- if (&__data_start != 0) {
- GC_data_start = (ptr_t)(&__data_start);
+ if ((ptr_t)__data_start != 0) {
+ GC_data_start = (ptr_t)(__data_start);
return;
}
- if (&data_start != 0) {
- GC_data_start = (ptr_t)(&data_start);
+ if ((ptr_t)data_start != 0) {
+ GC_data_start = (ptr_t)(data_start);
return;
}
# endif /* LINUX */
- GC_data_start = GC_find_limit((ptr_t)(&_end), FALSE);
+ GC_data_start = GC_find_limit((ptr_t)(_end), FALSE);
}
#endif
# endif /* ECOS_GC_MEMORY_SIZE */
// setjmp() function, as described in ANSI para 7.6.1.1
-#define setjmp( __env__ ) hal_setjmp( __env__ )
+#undef SETJMP
+#define SETJMP( __env__ ) hal_setjmp( __env__ )
// FIXME: This is a simple way of allocating memory which is
// compatible with ECOS early releases. Later releases use a more
#define sbrk tiny_sbrk
# endif /* ECOS */
-#if defined(NETBSD) && defined(__ELF__)
+#if (defined(NETBSD) || defined(OPENBSD)) && defined(__ELF__)
ptr_t GC_data_start;
void GC_init_netbsd_elf()
# if !defined(PCR) && !defined(AMIGA) && !defined(MSWIN32) \
&& !defined(MSWINCE) \
- && !defined(MACOS) && !defined(DJGPP) && !defined(DOS4GW)
+ && !defined(MACOS) && !defined(DJGPP) && !defined(DOS4GW) \
+ && !defined(NOSYS) && !defined(ECOS)
-# if defined(sigmask) && !defined(UTS4)
+# if defined(sigmask) && !defined(UTS4) && !defined(HURD)
/* Use the traditional BSD interface */
# define SIGSET_T int
# define SIG_DEL(set, signal) (set) &= ~(sigmask(signal))
typedef void (*handler)();
# endif
-# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
+# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1) \
+ || defined(HURD) || defined(NETBSD)
static struct sigaction old_segv_act;
-# if defined(_sigargs) || defined(HPUX) /* !Irix6.x */
+# if defined(IRIX5) || defined(HPUX) \
+ || defined(HURD) || defined(NETBSD)
static struct sigaction old_bus_act;
# endif
# else
handler h;
# endif
{
-# ifndef ECOS
-# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
+# if defined(SUNOS5SIGS) || defined(IRIX5) \
+ || defined(OSF1) || defined(HURD) || defined(NETBSD)
struct sigaction act;
act.sa_handler = h;
- act.sa_flags = SA_RESTART | SA_NODEFER;
- /* The presence of SA_NODEFER represents yet another gross */
- /* hack. Under Solaris 2.3, siglongjmp doesn't appear to */
- /* interact correctly with -lthread. We hide the confusion */
- /* by making sure that signal handling doesn't affect the */
- /* signal mask. */
+# if 0 /* Was necessary for Solaris 2.3 and very temporary */
+ /* NetBSD bugs. */
+ act.sa_flags = SA_RESTART | SA_NODEFER;
+# else
+ act.sa_flags = SA_RESTART;
+# endif
(void) sigemptyset(&act.sa_mask);
-# ifdef IRIX_THREADS
+# ifdef GC_IRIX_THREADS
/* Older versions have a bug related to retrieving and */
/* and setting a handler at the same time. */
(void) sigaction(SIGSEGV, 0, &old_segv_act);
(void) sigaction(SIGSEGV, &act, 0);
+ (void) sigaction(SIGBUS, 0, &old_bus_act);
+ (void) sigaction(SIGBUS, &act, 0);
# else
(void) sigaction(SIGSEGV, &act, &old_segv_act);
-# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
- || defined(HPUX)
+# if defined(IRIX5) \
+ || defined(HPUX) || defined(HURD) || defined(NETBSD)
/* Under Irix 5.x or HP/UX, we may get SIGBUS. */
/* Pthreads doesn't exist under Irix 5.x, so we */
/* don't have to worry in the threads case. */
(void) sigaction(SIGBUS, &act, &old_bus_act);
# endif
-# endif /* IRIX_THREADS */
+# endif /* GC_IRIX_THREADS */
# else
old_segv_handler = signal(SIGSEGV, h);
# ifdef SIGBUS
old_bus_handler = signal(SIGBUS, h);
# endif
# endif
-# endif /* ECOS */
}
# endif /* NEED_FIND_LIMIT || UNIX_LIKE */
# ifdef NEED_FIND_LIMIT
/* Some tools to implement HEURISTIC2 */
# define MIN_PAGE_SIZE 256 /* Smallest conceivable page size, bytes */
- /* static */ jmp_buf GC_jmp_buf;
+ /* static */ JMP_BUF GC_jmp_buf;
/*ARGSUSED*/
void GC_fault_handler(sig)
int sig;
{
- longjmp(GC_jmp_buf, 1);
+ LONGJMP(GC_jmp_buf, 1);
}
void GC_setup_temporary_fault_handler()
void GC_reset_fault_handler()
{
-# ifndef ECOS
-# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
+# if defined(SUNOS5SIGS) || defined(IRIX5) \
+ || defined(OSF1) || defined(HURD) || defined(NETBSD)
(void) sigaction(SIGSEGV, &old_segv_act, 0);
-# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
- || defined(HPUX)
+# if defined(IRIX5) \
+ || defined(HPUX) || defined(HURD) || defined(NETBSD)
(void) sigaction(SIGBUS, &old_bus_act, 0);
# endif
# else
(void) signal(SIGBUS, old_bus_handler);
# endif
# endif
-# endif /* ECOS */
}
/* Return the first nonaddressible location > p (up) or */
- /* the smallest location q s.t. [q,p] is addressible (!up). */
+ /* the smallest location q s.t. [q,p) is addressable (!up). */
+ /* We assume that p (up) or p-1 (!up) is addressable. */
ptr_t GC_find_limit(p, up)
ptr_t p;
GC_bool up;
{
-# ifndef ECOS
static VOLATILE ptr_t result;
/* Needs to be static, since otherwise it may not be */
/* preserved across the longjmp. Can safely be */
GC_setup_temporary_fault_handler();
- if (setjmp(GC_jmp_buf) == 0) {
+ if (SETJMP(GC_jmp_buf) == 0) {
result = (ptr_t)(((word)(p))
& ~(MIN_PAGE_SIZE-1));
for (;;) {
result += MIN_PAGE_SIZE;
}
return(result);
-# else /* ECOS */
- abort();
-# endif /* ECOS */
}
# endif
-# ifndef ECOS
+#if defined(ECOS) || defined(NOSYS)
+ ptr_t GC_get_stack_base()
+ {
+ return STACKBOTTOM;
+ }
+#endif
+
+#ifdef HPUX_STACKBOTTOM
+
+#include <sys/param.h>
+#include <sys/pstat.h>
+
+ ptr_t GC_get_register_stack_base(void)
+ {
+ struct pst_vm_status vm_status;
+
+ int i = 0;
+ while (pstat_getprocvm(&vm_status, sizeof(vm_status), 0, i++) == 1) {
+ if (vm_status.pst_type == PS_RSESTACK) {
+ return (ptr_t) vm_status.pst_vaddr;
+ }
+ }
+
+ /* old way to get the register stackbottom */
+ return (ptr_t)(((word)GC_stackbottom - BACKING_STORE_DISPLACEMENT - 1)
+ & ~(BACKING_STORE_ALIGNMENT - 1));
+ }
+
+#endif /* HPUX_STACK_BOTTOM */
#ifdef LINUX_STACKBOTTOM
# define STAT_SKIP 27 /* Number of fields preceding startstack */
/* field in /proc/self/stat */
+#ifdef USE_LIBC_PRIVATES
# pragma weak __libc_stack_end
extern ptr_t __libc_stack_end;
+#endif
# ifdef IA64
-# pragma weak __libc_ia64_register_backing_store_base
- extern ptr_t __libc_ia64_register_backing_store_base;
+ /* Try to read the backing store base from /proc/self/maps. */
+ /* We look for the writable mapping with a 0 major device, */
+ /* which is as close to our frame as possible, but below it.*/
+ static word backing_store_base_from_maps(char *maps)
+ {
+ char prot_buf[5];
+ char *buf_ptr = maps;
+ word start, end;
+ unsigned int maj_dev;
+ word current_best = 0;
+ word dummy;
+
+ for (;;) {
+ buf_ptr = GC_parse_map_entry(buf_ptr, &start, &end, prot_buf, &maj_dev);
+ if (buf_ptr == NULL) return current_best;
+ if (prot_buf[1] == 'w' && maj_dev == 0) {
+ if (end < (word)(&dummy) && start > current_best) current_best = start;
+ }
+ }
+ return current_best;
+ }
+
+ static word backing_store_base_from_proc(void)
+ {
+ return GC_apply_to_maps(backing_store_base_from_maps);
+ }
+
+# ifdef USE_LIBC_PRIVATES
+# pragma weak __libc_ia64_register_backing_store_base
+ extern ptr_t __libc_ia64_register_backing_store_base;
+# endif
ptr_t GC_get_register_stack_base(void)
{
- if (0 != &__libc_ia64_register_backing_store_base) {
- return __libc_ia64_register_backing_store_base;
- } else {
- word result = (word)GC_stackbottom - BACKING_STORE_DISPLACEMENT;
- result += BACKING_STORE_ALIGNMENT - 1;
- result &= ~(BACKING_STORE_ALIGNMENT - 1);
- return (ptr_t)result;
+# ifdef USE_LIBC_PRIVATES
+ if (0 != &__libc_ia64_register_backing_store_base
+ && 0 != __libc_ia64_register_backing_store_base) {
+ /* Glibc 2.2.4 has a bug such that for dynamically linked */
+ /* executables __libc_ia64_register_backing_store_base is */
+ /* defined but uninitialized during constructor calls. */
+ /* Hence we check for both nonzero address and value. */
+ return __libc_ia64_register_backing_store_base;
+ }
+# endif
+ word result = backing_store_base_from_proc();
+ if (0 == result) {
+ /* Use dumb heuristics. Works only for default configuration. */
+ result = (word)GC_stackbottom - BACKING_STORE_DISPLACEMENT;
+ result += BACKING_STORE_ALIGNMENT - 1;
+ result &= ~(BACKING_STORE_ALIGNMENT - 1);
+ /* Verify that it's at least readable. If not, we goofed. */
+ GC_noop1(*(word *)result);
}
+ return (ptr_t)result;
}
# endif
/* using direct I/O system calls in order to avoid calling malloc */
/* in case REDIRECT_MALLOC is defined. */
# define STAT_BUF_SIZE 4096
-# if defined(GC_USE_LD_WRAP)
-# define STAT_READ __real_read
-# else
-# define STAT_READ read
-# endif
+# define STAT_READ read
+ /* Should probably call the real read, if read is wrapped. */
char stat_buf[STAT_BUF_SIZE];
int f;
char c;
size_t i, buf_offset = 0;
/* First try the easy way. This should work for glibc 2.2 */
- if (0 != &__libc_stack_end) {
- return __libc_stack_end;
+ /* This fails in a prelinked ("prelink" command) executable */
+ /* since the correct value of __libc_stack_end never */
+ /* becomes visible to us. The second test works around */
+ /* this. */
+# ifdef USE_LIBC_PRIVATES
+ if (0 != &__libc_stack_end && 0 != __libc_stack_end ) {
+# ifdef IA64
+ /* Some versions of glibc set the address 16 bytes too */
+ /* low while the initialization code is running. */
+ if (((word)__libc_stack_end & 0xfff) + 0x10 < 0x1000) {
+ return __libc_stack_end + 0x10;
+ } /* Otherwise it's not safe to add 16 bytes and we fall */
+ /* back to using /proc. */
+# else
+# ifdef SPARC
+ /* Older versions of glibc for 64-bit Sparc do not set
+ * this variable correctly, it gets set to either zero
+ * or one.
+ */
+ if (__libc_stack_end != (ptr_t) (unsigned long)0x1)
+ return __libc_stack_end;
+# else
+ return __libc_stack_end;
+# endif
+# endif
}
+# endif
f = open("/proc/self/stat", O_RDONLY);
if (f < 0 || STAT_READ(f, stat_buf, STAT_BUF_SIZE) < 2 * STAT_SKIP) {
ABORT("Couldn't read /proc/self/stat");
ptr_t GC_freebsd_stack_base(void)
{
- int nm[2] = { CTL_KERN, KERN_USRSTACK}, base, len, r;
-
- len = sizeof(int);
- r = sysctl(nm, 2, &base, &len, NULL, 0);
+ int nm[2] = {CTL_KERN, KERN_USRSTACK};
+ ptr_t base;
+ size_t len = sizeof(ptr_t);
+ int r = sysctl(nm, 2, &base, &len, NULL, 0);
if (r) ABORT("Error getting stack base");
- return (ptr_t)base;
+ return base;
}
#endif /* FREEBSD_STACKBOTTOM */
#if !defined(BEOS) && !defined(AMIGA) && !defined(MSWIN32) \
- && !defined(MSWINCE) && !defined(OS2)
+ && !defined(MSWINCE) && !defined(OS2) && !defined(NOSYS) && !defined(ECOS)
ptr_t GC_get_stack_base()
{
+# if defined(HEURISTIC1) || defined(HEURISTIC2) || \
+ defined(LINUX_STACKBOTTOM) || defined(FREEBSD_STACKBOTTOM)
word dummy;
ptr_t result;
+# endif
# define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
return(result);
# endif /* STACKBOTTOM */
}
-# endif /* ECOS */
-# endif /* ! AMIGA, !OS 2, ! MS Windows, !BEOS */
+# endif /* ! AMIGA, !OS 2, ! MS Windows, !BEOS, !NOSYS, !ECOS */
/*
* Register static data segment(s) as roots.
/* Unfortunately, we have to handle win32s very differently from NT, */
/* Since VirtualQuery has very different semantics. In particular, */
/* under win32s a VirtualQuery call on an unmapped page returns an */
- /* invalid result. Under GC_register_data_segments is a noop and */
+ /* invalid result. Under NT, GC_register_data_segments is a noop and */
/* all real work is done by GC_register_dynamic_libraries. Under */
/* win32s, we cannot find the data segments associated with dll's. */
- /* We rgister the main data segment here. */
- GC_bool GC_win32s = FALSE; /* We're running under win32s. */
-
- GC_bool GC_is_win32s()
- {
- DWORD v = GetVersion();
-
- /* Check that this is not NT, and Windows major version <= 3 */
- return ((v & 0x80000000) && (v & 0xff) <= 3);
- }
+ /* We register the main data segment here. */
+ GC_bool GC_no_win32_dlls = FALSE;
+ /* This used to be set for gcc, to avoid dealing with */
+ /* the structured exception handling issues. But we now have */
+ /* assembly code to do that right. */
+ GC_bool GC_wnt = FALSE;
+ /* This is a Windows NT derivative, i.e. NT, W2K, XP or later. */
void GC_init_win32()
{
- GC_win32s = GC_is_win32s();
+ /* if we're running under win32s, assume that no DLLs will be loaded */
+ DWORD v = GetVersion();
+ GC_wnt = !(v & 0x80000000);
+ GC_no_win32_dlls |= ((!GC_wnt) && (v & 0xff) <= 3);
}
/* Return the smallest address a such that VirtualQuery */
return(p);
}
# endif
+
+# ifndef REDIRECT_MALLOC
+ /* We maintain a linked list of AllocationBase values that we know */
+ /* correspond to malloc heap sections. Currently this is only called */
+ /* during a GC. But there is some hope that for long running */
+ /* programs we will eventually see most heap sections. */
+
+ /* In the long run, it would be more reliable to occasionally walk */
+ /* the malloc heap with HeapWalk on the default heap. But that */
+ /* apparently works only for NT-based Windows. */
+
+ /* In the long run, a better data structure would also be nice ... */
+ struct GC_malloc_heap_list {
+ void * allocation_base;
+ struct GC_malloc_heap_list *next;
+ } *GC_malloc_heap_l = 0;
+
+ /* Is p the base of one of the malloc heap sections we already know */
+ /* about? */
+ GC_bool GC_is_malloc_heap_base(ptr_t p)
+ {
+ struct GC_malloc_heap_list *q = GC_malloc_heap_l;
+
+ while (0 != q) {
+ if (q -> allocation_base == p) return TRUE;
+ q = q -> next;
+ }
+ return FALSE;
+ }
+
+ void *GC_get_allocation_base(void *p)
+ {
+ MEMORY_BASIC_INFORMATION buf;
+ DWORD result = VirtualQuery(p, &buf, sizeof(buf));
+ if (result != sizeof(buf)) {
+ ABORT("Weird VirtualQuery result");
+ }
+ return buf.AllocationBase;
+ }
+
+ size_t GC_max_root_size = 100000; /* Appr. largest root size. */
+
+ void GC_add_current_malloc_heap()
+ {
+ struct GC_malloc_heap_list *new_l =
+ malloc(sizeof(struct GC_malloc_heap_list));
+ void * candidate = GC_get_allocation_base(new_l);
+
+ if (new_l == 0) return;
+ if (GC_is_malloc_heap_base(candidate)) {
+ /* Try a little harder to find malloc heap. */
+ size_t req_size = 10000;
+ do {
+ void *p = malloc(req_size);
+ if (0 == p) { free(new_l); return; }
+ candidate = GC_get_allocation_base(p);
+ free(p);
+ req_size *= 2;
+ } while (GC_is_malloc_heap_base(candidate)
+ && req_size < GC_max_root_size/10 && req_size < 500000);
+ if (GC_is_malloc_heap_base(candidate)) {
+ free(new_l); return;
+ }
+ }
+# ifdef CONDPRINT
+ if (GC_print_stats)
+ GC_printf1("Found new system malloc AllocationBase at 0x%lx\n",
+ candidate);
+# endif
+ new_l -> allocation_base = candidate;
+ new_l -> next = GC_malloc_heap_l;
+ GC_malloc_heap_l = new_l;
+ }
+# endif /* REDIRECT_MALLOC */
/* Is p the start of either the malloc heap, or of one of our */
/* heap sections? */
GC_bool GC_is_heap_base (ptr_t p)
{
- register unsigned i;
+ unsigned i;
# ifndef REDIRECT_MALLOC
- static ptr_t malloc_heap_pointer = 0;
+ static word last_gc_no = -1;
- if (0 == malloc_heap_pointer) {
- MEMORY_BASIC_INFORMATION buf;
- void *pTemp = malloc( 1 );
- register DWORD result = VirtualQuery(pTemp, &buf, sizeof(buf));
-
- free( pTemp );
-
-
- if (result != sizeof(buf)) {
- ABORT("Weird VirtualQuery result");
- }
- malloc_heap_pointer = (ptr_t)(buf.AllocationBase);
+ if (last_gc_no != GC_gc_no) {
+ GC_add_current_malloc_heap();
+ last_gc_no = GC_gc_no;
}
- if (p == malloc_heap_pointer) return(TRUE);
+ if (GC_root_size > GC_max_root_size) GC_max_root_size = GC_root_size;
+ if (GC_is_malloc_heap_base(p)) return TRUE;
# endif
for (i = 0; i < GC_n_heap_bases; i++) {
- if (GC_heap_bases[i] == p) return(TRUE);
+ if (GC_heap_bases[i] == p) return TRUE;
}
- return(FALSE);
+ return FALSE ;
}
# ifdef MSWIN32
char * base;
char * limit, * new_limit;
- if (!GC_win32s) return;
+ if (!GC_no_win32_dlls) return;
p = base = limit = GC_least_described_address(static_root);
while (p < GC_sysinfo.lpMaximumApplicationAddress) {
result = VirtualQuery(p, &buf, sizeof(buf));
# if (defined(SVR4) || defined(AUX) || defined(DGUX) \
|| (defined(LINUX) && defined(SPARC))) && !defined(PCR)
-char * GC_SysVGetDataStart(max_page_size, etext_addr)
+ptr_t GC_SysVGetDataStart(max_page_size, etext_addr)
int max_page_size;
int * etext_addr;
{
/* max_page_size to &etext if &etext is at a page boundary */
GC_setup_temporary_fault_handler();
- if (setjmp(GC_jmp_buf) == 0) {
+ if (SETJMP(GC_jmp_buf) == 0) {
/* Try writing to the address. */
*result = *result;
GC_reset_fault_handler();
/* string constants in the text segment, but after etext. */
/* Use plan B. Note that we now know there is a gap between */
/* text and data segments, so plan A bought us something. */
- result = (char *)GC_find_limit((ptr_t)(DATAEND) - MIN_PAGE_SIZE, FALSE);
+ result = (char *)GC_find_limit((ptr_t)(DATAEND), FALSE);
+ }
+ return((ptr_t)result);
+}
+# endif
+
+# if defined(FREEBSD) && (defined(I386) || defined(X86_64) || defined(powerpc) || defined(__powerpc__)) && !defined(PCR)
+/* Its unclear whether this should be identical to the above, or */
+/* whether it should apply to non-X86 architectures. */
+/* For now we don't assume that there is always an empty page after */
+/* etext. But in some cases there actually seems to be slightly more. */
+/* This also deals with holes between read-only data and writable data. */
+ptr_t GC_FreeBSDGetDataStart(max_page_size, etext_addr)
+int max_page_size;
+int * etext_addr;
+{
+ word text_end = ((word)(etext_addr) + sizeof(word) - 1)
+ & ~(sizeof(word) - 1);
+ /* etext rounded to word boundary */
+ VOLATILE word next_page = (text_end + (word)max_page_size - 1)
+ & ~((word)max_page_size - 1);
+ VOLATILE ptr_t result = (ptr_t)text_end;
+ GC_setup_temporary_fault_handler();
+ if (SETJMP(GC_jmp_buf) == 0) {
+ /* Try reading at the address. */
+ /* This should happen before there is another thread. */
+ for (; next_page < (word)(DATAEND); next_page += (word)max_page_size)
+ *(VOLATILE char *)next_page;
+ GC_reset_fault_handler();
+ } else {
+ GC_reset_fault_handler();
+ /* As above, we go to plan B */
+ result = GC_find_limit((ptr_t)(DATAEND), FALSE);
}
- return((char *)result);
+ return(result);
}
+
# endif
void GC_register_data_segments()
{
-# if !defined(PCR) && !defined(SRC_M3) && !defined(NEXT) && !defined(MACOS) \
- && !defined(MACOSX)
-# if defined(REDIRECT_MALLOC) && defined(SOLARIS_THREADS)
+# if !defined(PCR) && !defined(SRC_M3) && !defined(MACOS)
+# if defined(REDIRECT_MALLOC) && defined(GC_SOLARIS_THREADS)
/* As of Solaris 2.3, the Solaris threads implementation */
/* allocates the data structure for the initial thread with */
/* sbrk at process startup. It needs to be scanned, so that */
GC_add_roots_inner(DATASTART, (char *)sbrk(0), FALSE);
# else
GC_add_roots_inner(DATASTART, (char *)(DATAEND), FALSE);
+# if defined(DATASTART2)
+ GC_add_roots_inner(DATASTART2, (char *)(DATAEND2), FALSE);
+# endif
# endif
# endif
-# if !defined(PCR) && (defined(NEXT) || defined(MACOSX))
- GC_add_roots_inner(DATASTART, (char *) get_end(), FALSE);
-# endif
# if defined(MACOS)
{
# if defined(THINK_C)
# endif
-# ifdef RS6000
+# if 0 && defined(RS6000) /* We now use mmap */
/* The compiler seems to generate speculative reads one past the end of */
/* an allocated object. Hence we need to make sure that the page */
/* following the last heap page is also mapped. */
#else /* Not RS6000 */
-#if defined(USE_MMAP)
-/* Tested only under Linux, IRIX5 and Solaris 2 */
+#if defined(USE_MMAP) || defined(USE_MUNMAP)
#ifdef USE_MMAP_FIXED
# define GC_MMAP_FLAGS MAP_FIXED | MAP_PRIVATE
# define GC_MMAP_FLAGS MAP_PRIVATE
#endif
+#ifdef USE_MMAP_ANON
+# define zero_fd -1
+# if defined(MAP_ANONYMOUS)
+# define OPT_MAP_ANON MAP_ANONYMOUS
+# else
+# define OPT_MAP_ANON MAP_ANON
+# endif
+#else
+ static int zero_fd;
+# define OPT_MAP_ANON 0
+#endif
+
+#endif /* defined(USE_MMAP) || defined(USE_MUNMAP) */
+
+#if defined(USE_MMAP)
+/* Tested only under Linux, IRIX5 and Solaris 2 */
+
#ifndef HEAP_START
# define HEAP_START 0
#endif
ptr_t GC_unix_get_mem(bytes)
word bytes;
{
- static GC_bool initialized = FALSE;
- static int fd;
void *result;
static ptr_t last_addr = HEAP_START;
- if (!initialized) {
- fd = open("/dev/zero", O_RDONLY);
- initialized = TRUE;
- }
+# ifndef USE_MMAP_ANON
+ static GC_bool initialized = FALSE;
+
+ if (!initialized) {
+ zero_fd = open("/dev/zero", O_RDONLY);
+ fcntl(zero_fd, F_SETFD, FD_CLOEXEC);
+ initialized = TRUE;
+ }
+# endif
+
if (bytes & (GC_page_size -1)) ABORT("Bad GET_MEM arg");
result = mmap(last_addr, bytes, PROT_READ | PROT_WRITE | OPT_PROT_EXEC,
- GC_MMAP_FLAGS, fd, 0/* offset */);
+ GC_MMAP_FLAGS | OPT_MAP_ANON, zero_fd, 0/* offset */);
if (result == MAP_FAILED) return(0);
last_addr = (ptr_t)result + bytes + GC_page_size - 1;
last_addr = (ptr_t)((word)last_addr & ~(GC_page_size - 1));
SYSTEM_INFO GC_sysinfo;
# endif
-
# ifdef MSWIN32
+
+# ifdef USE_GLOBAL_ALLOC
+# define GLOBAL_ALLOC_TEST 1
+# else
+# define GLOBAL_ALLOC_TEST GC_no_win32_dlls
+# endif
+
word GC_n_heap_bases = 0;
ptr_t GC_win32_get_mem(bytes)
{
ptr_t result;
- if (GC_win32s) {
+ if (GLOBAL_ALLOC_TEST) {
/* VirtualAlloc doesn't like PAGE_EXECUTE_READWRITE. */
/* There are also unconfirmed rumors of other */
/* problems, so we dodge the issue. */
result = (ptr_t) GlobalAlloc(0, bytes + HBLKSIZE);
result = (ptr_t)(((word)result + HBLKSIZE) & ~(HBLKSIZE-1));
} else {
- result = (ptr_t) VirtualAlloc(NULL, bytes,
+ /* VirtualProtect only works on regions returned by a */
+ /* single VirtualAlloc call. Thus we allocate one */
+ /* extra page, which will prevent merging of blocks */
+ /* in separate regions, and eliminate any temptation */
+ /* to call VirtualProtect on a range spanning regions. */
+ /* This wastes a small amount of memory, and risks */
+ /* increased fragmentation. But better alternatives */
+ /* would require effort. */
+ result = (ptr_t) VirtualAlloc(NULL, bytes + 1,
MEM_COMMIT | MEM_RESERVE,
PAGE_EXECUTE_READWRITE);
}
void GC_win32_free_heap ()
{
- if (GC_win32s) {
+ if (GC_no_win32_dlls) {
while (GC_n_heap_bases > 0) {
GlobalFree (GC_heap_bases[--GC_n_heap_bases]);
GC_heap_bases[GC_n_heap_bases] = 0;
/* Reserve more pages */
word res_bytes = (bytes + GC_sysinfo.dwAllocationGranularity-1)
& ~(GC_sysinfo.dwAllocationGranularity-1);
+ /* If we ever support MPROTECT_VDB here, we will probably need to */
+ /* ensure that res_bytes is strictly > bytes, so that VirtualProtect */
+ /* never spans regions. It seems to be OK for a VirtualFree argument */
+ /* to span regions, so we should be OK for now. */
result = (ptr_t) VirtualAlloc(NULL, res_bytes,
MEM_RESERVE | MEM_TOP_DOWN,
PAGE_EXECUTE_READWRITE);
len -= free_len;
}
# else
- if (munmap(start_addr, len) != 0) ABORT("munmap failed");
+ /* We immediately remap it to prevent an intervening mmap from */
+ /* accidentally grabbing the same address space. */
+ {
+ void * result;
+ result = mmap(start_addr, len, PROT_NONE,
+ MAP_PRIVATE | MAP_FIXED | OPT_MAP_ANON,
+ zero_fd, 0/* offset */);
+ if (result != (void *)start_addr) ABORT("mmap(...PROT_NONE...) failed");
+ }
GC_unmapped_bytes += len;
# endif
}
void GC_remap(ptr_t start, word bytes)
{
- static int zero_descr = -1;
ptr_t start_addr = GC_unmap_start(start, bytes);
ptr_t end_addr = GC_unmap_end(start, bytes);
word len = end_addr - start_addr;
- ptr_t result;
# if defined(MSWIN32) || defined(MSWINCE)
+ ptr_t result;
+
if (0 == start_addr) return;
while (len != 0) {
MEMORY_BASIC_INFORMATION mem_info;
len -= alloc_len;
}
# else
- if (-1 == zero_descr) zero_descr = open("/dev/zero", O_RDWR);
+ /* It was already remapped with PROT_NONE. */
+ int result;
+
if (0 == start_addr) return;
- result = mmap(start_addr, len, PROT_READ | PROT_WRITE | OPT_PROT_EXEC,
- MAP_FIXED | MAP_PRIVATE, zero_descr, 0);
- if (result != start_addr) {
- ABORT("mmap remapping failed");
+ result = mprotect(start_addr, len,
+ PROT_READ | PROT_WRITE | OPT_PROT_EXEC);
+ if (result != 0) {
+ GC_err_printf3(
+ "Mprotect failed at 0x%lx (length %ld) with errno %ld\n",
+ start_addr, len, errno);
+ ABORT("Mprotect remapping failed");
}
GC_unmapped_bytes -= len;
# endif
# endif /* SRC_M3 */
-# if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
- || defined(IRIX_THREADS) || defined(LINUX_THREADS) \
- || defined(HPUX_THREADS)
+# if defined(GC_SOLARIS_THREADS) || defined(GC_PTHREADS) || \
+ defined(GC_WIN32_THREADS)
extern void GC_push_all_stacks();
GC_push_all_stacks();
}
-# endif /* SOLARIS_THREADS || ... */
+# endif /* GC_SOLARIS_THREADS || GC_PTHREADS */
void (*GC_push_other_roots) GC_PROTO((void)) = GC_default_push_other_roots;
-#endif
+#endif /* THREADS */
/*
* Routines for accessing dirty bits on virtual pages.
* make sure that other system calls are similarly protected
* or write only to the stack.
*/
-
GC_bool GC_dirty_maintained = FALSE;
# ifdef DEFAULT_VDB
/* Initialize virtual dirty bit implementation. */
void GC_dirty_init()
{
+# ifdef PRINTSTATS
+ GC_printf0("Initializing DEFAULT_VDB...\n");
+# endif
GC_dirty_maintained = TRUE;
}
{
}
-/* A call hints that h is about to be written. */
-/* May speed up some dirty bit implementations. */
+/* A call that: */
+/* I) hints that [h, h+nblocks) is about to be written. */
+/* II) guarantees that protection is removed. */
+/* (I) may speed up some dirty bit implementations. */
+/* (II) may be essential if we need to ensure that */
+/* pointer-free system call buffers in the heap are */
+/* not protected. */
/*ARGSUSED*/
-void GC_write_hint(h)
+void GC_remove_protection(h, nblocks, is_ptrfree)
struct hblk *h;
+word nblocks;
+GC_bool is_ptrfree;
{
}
/*
* This implementation maintains dirty bits itself by catching write
* faults and keeping track of them. We assume nobody else catches
- * SIGBUS or SIGSEGV. We assume no write faults occur in system calls
- * except as a result of a read system call. This means clients must
- * either ensure that system calls do not touch the heap, or must
- * provide their own wrappers analogous to the one for read.
+ * SIGBUS or SIGSEGV. We assume no write faults occur in system calls.
+ * This means that clients must ensure that system calls don't write
+ * to the write-protected heap. Probably the best way to do this is to
+ * ensure that system calls write at most to POINTERFREE objects in the
+ * heap, and do even that only if we are on a platform on which those
+ * are not protected. Another alternative is to wrap system calls
+ * (see example for read below), but the current implementation holds
+ * a lock across blocking calls, making it problematic for multithreaded
+ * applications.
* We assume the page size is a multiple of HBLKSIZE.
- * This implementation is currently SunOS 4.X and IRIX 5.X specific, though we
- * tried to use portable code where easily possible. It is known
- * not to work under a number of other systems.
+ * We prefer them to be the same. We avoid protecting POINTERFREE
+ * objects only if they are the same.
*/
-# if !defined(MSWIN32) && !defined(MSWINCE)
+# if !defined(MSWIN32) && !defined(MSWINCE) && !defined(DARWIN)
# include <sys/mman.h>
# include <signal.h>
# else
+# ifdef DARWIN
+ /* Using vm_protect (mach syscall) over mprotect (BSD syscall) seems to
+ decrease the likelihood of some of the problems described below. */
+ #include <mach/vm_map.h>
+ static mach_port_t GC_task_self;
+ #define PROTECT(addr,len) \
+ if(vm_protect(GC_task_self,(vm_address_t)(addr),(vm_size_t)(len), \
+ FALSE,VM_PROT_READ) != KERN_SUCCESS) { \
+ ABORT("vm_portect failed"); \
+ }
+ #define UNPROTECT(addr,len) \
+ if(vm_protect(GC_task_self,(vm_address_t)(addr),(vm_size_t)(len), \
+ FALSE,VM_PROT_READ|VM_PROT_WRITE) != KERN_SUCCESS) { \
+ ABORT("vm_portect failed"); \
+ }
+# else
+
# ifndef MSWINCE
# include <signal.h>
# endif
&protect_junk)) { \
ABORT("un-VirtualProtect failed"); \
}
-
-# endif
+# endif /* !DARWIN */
+# endif /* MSWIN32 || MSWINCE || DARWIN */
-#if defined(SUNOS4) || defined(FREEBSD)
+#if defined(SUNOS4) || (defined(FREEBSD) && !defined(SUNOS5SIGS))
typedef void (* SIG_PF)();
-#endif
-#if defined(SUNOS5SIGS) || defined(OSF1) || defined(LINUX) || defined(MACOSX)
+#endif /* SUNOS4 || (FREEBSD && !SUNOS5SIGS) */
+
+#if defined(SUNOS5SIGS) || defined(OSF1) || defined(LINUX) \
+ || defined(HURD)
# ifdef __STDC__
typedef void (* SIG_PF)(int);
# else
typedef void (* SIG_PF)();
# endif
-#endif
+#endif /* SUNOS5SIGS || OSF1 || LINUX || HURD */
+
#if defined(MSWIN32)
typedef LPTOP_LEVEL_EXCEPTION_FILTER SIG_PF;
# undef SIG_DFL
# define SIG_DFL (SIG_PF) (-1)
#endif
-#if defined(IRIX5) || defined(OSF1)
+#if defined(IRIX5) || defined(OSF1) || defined(HURD)
typedef void (* REAL_SIG_PF)(int, int, struct sigcontext *);
-#endif
+#endif /* IRIX5 || OSF1 || HURD */
+
#if defined(SUNOS5SIGS)
-# ifdef HPUX
-# define SIGINFO __siginfo
+# if defined(HPUX) || defined(FREEBSD)
+# define SIGINFO_T siginfo_t
# else
-# define SIGINFO siginfo
+# define SIGINFO_T struct siginfo
# endif
# ifdef __STDC__
- typedef void (* REAL_SIG_PF)(int, struct SIGINFO *, void *);
+ typedef void (* REAL_SIG_PF)(int, SIGINFO_T *, void *);
# else
typedef void (* REAL_SIG_PF)();
# endif
-#endif
+#endif /* SUNOS5SIGS */
+
#if defined(LINUX)
-# include <linux/version.h>
-# if (LINUX_VERSION_CODE >= 0x20100) && !defined(M68K) || defined(ALPHA) || defined(IA64)
+# if __GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 2
typedef struct sigcontext s_c;
-# else
- typedef struct sigcontext_struct s_c;
-# endif
+# else /* glibc < 2.2 */
+# include <linux/version.h>
+# if (LINUX_VERSION_CODE >= 0x20100) && !defined(M68K) || defined(ALPHA) || defined(ARM32)
+ typedef struct sigcontext s_c;
+# else
+ typedef struct sigcontext_struct s_c;
+# endif
+# endif /* glibc < 2.2 */
# if defined(ALPHA) || defined(M68K)
typedef void (* REAL_SIG_PF)(int, int, s_c *);
# else
-# if defined(IA64) || defined(HP_PA)
+# if defined(IA64) || defined(HP_PA) || defined(X86_64)
typedef void (* REAL_SIG_PF)(int, siginfo_t *, s_c *);
+ /* FIXME: */
+ /* According to SUSV3, the last argument should have type */
+ /* void * or ucontext_t * */
# else
typedef void (* REAL_SIG_PF)(int, s_c);
# endif
return (char *)faultaddr;
}
# endif /* !ALPHA */
-# endif
-
-# if defined(MACOSX) /* Should also test for PowerPC? */
- typedef void (* REAL_SIG_PF)(int, int, struct sigcontext *);
-
-/* Decodes the machine instruction which was responsible for the sending of the
- SIGBUS signal. Sadly this is the only way to find the faulting address because
- the signal handler doesn't get it directly from the kernel (although it is
- available on the Mach level, but droppped by the BSD personality before it
- calls our signal handler...)
- This code should be able to deal correctly with all PPCs starting from the
- 601 up to and including the G4s (including Velocity Engine). */
-#define EXTRACT_OP1(iw) (((iw) & 0xFC000000) >> 26)
-#define EXTRACT_OP2(iw) (((iw) & 0x000007FE) >> 1)
-#define EXTRACT_REGA(iw) (((iw) & 0x001F0000) >> 16)
-#define EXTRACT_REGB(iw) (((iw) & 0x03E00000) >> 21)
-#define EXTRACT_REGC(iw) (((iw) & 0x0000F800) >> 11)
-#define EXTRACT_DISP(iw) ((short *) &(iw))[1]
-
-static char *get_fault_addr(struct sigcontext *scp)
-{
- unsigned int instr = *((unsigned int *) scp->sc_ir);
- unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
- int disp = 0, tmp;
- unsigned int baseA = 0, baseB = 0;
- unsigned int addr, alignmask = 0xFFFFFFFF;
-
-#ifdef GC_DEBUG_DECODER
- GC_err_printf1("Instruction: 0x%lx\n", instr);
- GC_err_printf1("Opcode 1: d\n", (int)EXTRACT_OP1(instr));
-#endif
- switch(EXTRACT_OP1(instr)) {
- case 38: /* stb */
- case 39: /* stbu */
- case 54: /* stfd */
- case 55: /* stfdu */
- case 52: /* stfs */
- case 53: /* stfsu */
- case 44: /* sth */
- case 45: /* sthu */
- case 47: /* stmw */
- case 36: /* stw */
- case 37: /* stwu */
- tmp = EXTRACT_REGA(instr);
- if(tmp > 0)
- baseA = regs[tmp];
- disp = EXTRACT_DISP(instr);
- break;
- case 31:
-#ifdef GC_DEBUG_DECODER
- GC_err_printf1("Opcode 2: %d\n", (int)EXTRACT_OP2(instr));
-#endif
- switch(EXTRACT_OP2(instr)) {
- case 86: /* dcbf */
- case 54: /* dcbst */
- case 1014: /* dcbz */
- case 247: /* stbux */
- case 215: /* stbx */
- case 759: /* stfdux */
- case 727: /* stfdx */
- case 983: /* stfiwx */
- case 695: /* stfsux */
- case 663: /* stfsx */
- case 918: /* sthbrx */
- case 439: /* sthux */
- case 407: /* sthx */
- case 661: /* stswx */
- case 662: /* stwbrx */
- case 150: /* stwcx. */
- case 183: /* stwux */
- case 151: /* stwx */
- case 135: /* stvebx */
- case 167: /* stvehx */
- case 199: /* stvewx */
- case 231: /* stvx */
- case 487: /* stvxl */
- tmp = EXTRACT_REGA(instr);
- if(tmp > 0)
- baseA = regs[tmp];
- baseB = regs[EXTRACT_REGC(instr)];
- /* determine Altivec alignment mask */
- switch(EXTRACT_OP2(instr)) {
- case 167: /* stvehx */
- alignmask = 0xFFFFFFFE;
- break;
- case 199: /* stvewx */
- alignmask = 0xFFFFFFFC;
- break;
- case 231: /* stvx */
- alignmask = 0xFFFFFFF0;
- break;
- case 487: /* stvxl */
- alignmask = 0xFFFFFFF0;
- break;
- }
- break;
- case 725: /* stswi */
- tmp = EXTRACT_REGA(instr);
- if(tmp > 0)
- baseA = regs[tmp];
- break;
- default: /* ignore instruction */
-#ifdef GC_DEBUG_DECODER
- GC_err_printf("Ignored by inner handler\n");
-#endif
- return NULL;
- break;
- }
- break;
- default: /* ignore instruction */
-#ifdef GC_DEBUG_DECODER
- GC_err_printf("Ignored by main handler\n");
-#endif
- return NULL;
- break;
- }
-
- addr = (baseA + baseB) + disp;
- addr &= alignmask;
-#ifdef GC_DEBUG_DECODER
- GC_err_printf1("BaseA: %d\n", baseA);
- GC_err_printf1("BaseB: %d\n", baseB);
- GC_err_printf1("Disp: %d\n", disp);
- GC_err_printf1("Address: %d\n", addr);
-#endif
- return (char *)addr;
-}
-#endif /* MACOSX */
+# endif /* LINUX */
+#ifndef DARWIN
SIG_PF GC_old_bus_handler;
SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */
+#endif /* !DARWIN */
-#ifdef THREADS
+#if defined(THREADS)
/* We need to lock around the bitmap update in the write fault handler */
/* in order to avoid the risk of losing a bit. We do this with a */
/* test-and-set spin lock if we know how to do that. Otherwise we */
#ifdef GC_TEST_AND_SET_DEFINED
static VOLATILE unsigned int fault_handler_lock = 0;
void async_set_pht_entry_from_index(VOLATILE page_hash_table db, int index) {
- while (GC_test_and_set(&fault_handler_lock));
+ while (GC_test_and_set(&fault_handler_lock)) {}
/* Could also revert to set_pht_entry_from_index_safe if initial */
/* GC_test_and_set fails. */
set_pht_entry_from_index(db, index);
#endif /* !THREADS */
/*ARGSUSED*/
-# if defined (SUNOS4) || defined(FREEBSD)
+#if !defined(DARWIN)
+# if defined (SUNOS4) || (defined(FREEBSD) && !defined(SUNOS5SIGS))
void GC_write_fault_handler(sig, code, scp, addr)
int sig, code;
struct sigcontext *scp;
# endif
# ifdef FREEBSD
# define SIG_OK (sig == SIGBUS)
-# define CODE_OK (code == BUS_PAGE_FAULT)
+# define CODE_OK TRUE
# endif
-# endif
-# if defined(IRIX5) || defined(OSF1)
+# endif /* SUNOS4 || (FREEBSD && !SUNOS5SIGS) */
+
+# if defined(IRIX5) || defined(OSF1) || defined(HURD)
# include <errno.h>
void GC_write_fault_handler(int sig, int code, struct sigcontext *scp)
-# define SIG_OK (sig == SIGSEGV)
# ifdef OSF1
+# define SIG_OK (sig == SIGSEGV)
# define CODE_OK (code == 2 /* experimentally determined */)
# endif
# ifdef IRIX5
+# define SIG_OK (sig == SIGSEGV)
# define CODE_OK (code == EACCES)
# endif
-# endif
+# ifdef HURD
+# define SIG_OK (sig == SIGBUS || sig == SIGSEGV)
+# define CODE_OK TRUE
+# endif
+# endif /* IRIX5 || OSF1 || HURD */
+
# if defined(LINUX)
# if defined(ALPHA) || defined(M68K)
void GC_write_fault_handler(int sig, int code, s_c * sc)
# else
-# if defined(IA64) || defined(HP_PA)
+# if defined(IA64) || defined(HP_PA) || defined(X86_64)
void GC_write_fault_handler(int sig, siginfo_t * si, s_c * scp)
# else
- void GC_write_fault_handler(int sig, s_c sc)
+# if defined(ARM32)
+ void GC_write_fault_handler(int sig, int a2, int a3, int a4, s_c sc)
+# else
+ void GC_write_fault_handler(int sig, s_c sc)
+# endif
# endif
# endif
# define SIG_OK (sig == SIGSEGV)
/* Empirically c.trapno == 14, on IA32, but is that useful? */
/* Should probably consider alignment issues on other */
/* architectures. */
-# endif
+# endif /* LINUX */
+
# if defined(SUNOS5SIGS)
# ifdef __STDC__
- void GC_write_fault_handler(int sig, struct SIGINFO *scp, void * context)
+ void GC_write_fault_handler(int sig, SIGINFO_T *scp, void * context)
# else
void GC_write_fault_handler(sig, scp, context)
int sig;
- struct SIGINFO *scp;
+ SIGINFO_T *scp;
void * context;
# endif
# ifdef HPUX
|| (scp -> si_code == SEGV_UNKNOWN) \
|| (scp -> si_code == BUS_OBJERR)
# else
-# define SIG_OK (sig == SIGSEGV)
-# define CODE_OK (scp -> si_code == SEGV_ACCERR)
-# endif
-# endif
-
-# if defined(MACOSX)
- void GC_write_fault_handler(int sig, int code, struct sigcontext *scp)
-# define SIG_OK (sig == SIGBUS)
-# define CODE_OK (code == 0 /* experimentally determined */)
-# endif
+# ifdef FREEBSD
+# define SIG_OK (sig == SIGBUS)
+# define CODE_OK (scp -> si_code == BUS_PAGE_FAULT)
+# else
+# define SIG_OK (sig == SIGSEGV)
+# define CODE_OK (scp -> si_code == SEGV_ACCERR)
+# endif
+# endif
+# endif /* SUNOS5SIGS */
# if defined(MSWIN32) || defined(MSWINCE)
LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info)
STATUS_ACCESS_VIOLATION)
# define CODE_OK (exc_info -> ExceptionRecord -> ExceptionInformation[0] == 1)
/* Write fault */
-# endif
+# endif /* MSWIN32 || MSWINCE */
{
register unsigned i;
+# if defined(HURD)
+ char *addr = (char *) code;
+# endif
# ifdef IRIX5
char * addr = (char *) (size_t) (scp -> sc_badvaddr);
# endif
char * addr = (char *) (scp -> si_addr);
# endif
# ifdef LINUX
-# ifdef I386
+# if defined(I386)
char * addr = (char *) (sc.cr2);
# else
# if defined(M68K)
# ifdef ALPHA
char * addr = get_fault_addr(sc);
# else
-# if defined(IA64) || defined(HP_PA)
+# if defined(IA64) || defined(HP_PA) || defined(X86_64)
char * addr = si -> si_addr;
/* I believe this is claimed to work on all platforms for */
/* Linux 2.3.47 and later. Hopefully we don't have to */
# if defined(POWERPC)
char * addr = (char *) (sc.regs->dar);
# else
- --> architecture not supported
+# if defined(ARM32)
+ char * addr = (char *)sc.fault_address;
+# else
+# if defined(CRIS)
+ char * addr = (char *)sc.regs.csraddr;
+# else
+ --> architecture not supported
+# endif
+# endif
# endif
# endif
# endif
# endif
# endif
# endif
-# if defined(MACOSX)
- char * addr = get_fault_addr(scp);
-# endif
# if defined(MSWIN32) || defined(MSWINCE)
char * addr = (char *) (exc_info -> ExceptionRecord
-> ExceptionInformation[1]);
in_allocd_block = (HDR(addr) != 0);
# endif
if (!in_allocd_block) {
+ /* FIXME - We should make sure that we invoke the */
+ /* old handler with the appropriate calling */
+ /* sequence, which often depends on SA_SIGINFO. */
+
/* Heap blocks now begin and end on page boundaries */
SIG_PF old_handler;
return(EXCEPTION_CONTINUE_SEARCH);
# endif
} else {
-# if defined (SUNOS4) || defined(FREEBSD)
+# if defined (SUNOS4) \
+ || (defined(FREEBSD) && !defined(SUNOS5SIGS))
(*old_handler) (sig, code, scp, addr);
return;
# endif
# if defined (SUNOS5SIGS)
+ /*
+ * FIXME: For FreeBSD, this code should check if the
+ * old signal handler used the traditional BSD style and
+ * if so call it using that style.
+ */
(*(REAL_SIG_PF)old_handler) (sig, scp, context);
return;
# endif
# if defined(ALPHA) || defined(M68K)
(*(REAL_SIG_PF)old_handler) (sig, code, sc);
# else
-# if defined(IA64) || defined(HP_PA)
+# if defined(IA64) || defined(HP_PA) || defined(X86_64)
(*(REAL_SIG_PF)old_handler) (sig, si, scp);
# else
(*(REAL_SIG_PF)old_handler) (sig, sc);
# endif
return;
# endif
-# if defined (IRIX5) || defined(OSF1)
+# if defined (IRIX5) || defined(OSF1) || defined(HURD)
(*(REAL_SIG_PF)old_handler) (sig, code, scp);
return;
# endif
-# ifdef MACOSX
- (*(REAL_SIG_PF)old_handler) (sig, code, scp);
-# endif
# ifdef MSWIN32
return((*old_handler)(exc_info));
# endif
}
}
+ UNPROTECT(h, GC_page_size);
+ /* We need to make sure that no collection occurs between */
+ /* the UNPROTECT and the setting of the dirty bit. Otherwise */
+ /* a write by a third thread might go unnoticed. Reversing */
+ /* the order is just as bad, since we would end up unprotecting */
+ /* a page in a GC cycle during which it's not marked. */
+ /* Currently we do this by disabling the thread stopping */
+ /* signals while this handler is running. An alternative might */
+ /* be to record the fact that we're about to unprotect, or */
+ /* have just unprotected a page in the GC's thread structure, */
+ /* and then to have the thread stopping code set the dirty */
+ /* flag, if necessary. */
for (i = 0; i < divHBLKSZ(GC_page_size); i++) {
register int index = PHT_HASH(h+i);
async_set_pht_entry_from_index(GC_dirty_pages, index);
}
- UNPROTECT(h, GC_page_size);
-# if defined(OSF1) || defined(LINUX)
+# if defined(OSF1)
/* These reset the signal handler each time by default. */
signal(SIGSEGV, (SIG_PF) GC_write_fault_handler);
# endif
ABORT("Unexpected bus error or segmentation fault");
#endif
}
+#endif /* !DARWIN */
/*
* We hold the allocation lock. We expect block h to be written
- * shortly.
+ * shortly. Ensure that all pages containing any part of the n hblks
+ * starting at h are no longer protected. If is_ptrfree is false,
+ * also ensure that they will subsequently appear to be dirty.
*/
-void GC_write_hint(h)
+void GC_remove_protection(h, nblocks, is_ptrfree)
struct hblk *h;
+word nblocks;
+GC_bool is_ptrfree;
{
- register struct hblk * h_trunc;
- register unsigned i;
- register GC_bool found_clean;
+ struct hblk * h_trunc; /* Truncated to page boundary */
+ struct hblk * h_end; /* Page boundary following block end */
+ struct hblk * current;
+ GC_bool found_clean;
if (!GC_dirty_maintained) return;
h_trunc = (struct hblk *)((word)h & ~(GC_page_size-1));
+ h_end = (struct hblk *)(((word)(h + nblocks) + GC_page_size-1)
+ & ~(GC_page_size-1));
found_clean = FALSE;
- for (i = 0; i < divHBLKSZ(GC_page_size); i++) {
- register int index = PHT_HASH(h_trunc+i);
+ for (current = h_trunc; current < h_end; ++current) {
+ int index = PHT_HASH(current);
- if (!get_pht_entry_from_index(GC_dirty_pages, index)) {
- found_clean = TRUE;
+ if (!is_ptrfree || current < h || current >= h + nblocks) {
async_set_pht_entry_from_index(GC_dirty_pages, index);
}
}
- if (found_clean) {
- UNPROTECT(h_trunc, GC_page_size);
- }
+ UNPROTECT(h_trunc, (ptr_t)h_end - (ptr_t)h_trunc);
}
+#if !defined(DARWIN)
void GC_dirty_init()
{
-# if defined(SUNOS5SIGS) || defined(IRIX5) /* || defined(OSF1) */
+# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(LINUX) || \
+ defined(OSF1) || defined(HURD)
struct sigaction act, oldact;
-# ifdef IRIX5
+ /* We should probably specify SA_SIGINFO for Linux, and handle */
+ /* the different architectures more uniformly. */
+# if defined(IRIX5) || defined(LINUX) && !defined(X86_64) \
+ || defined(OSF1) || defined(HURD)
act.sa_flags = SA_RESTART;
- act.sa_handler = GC_write_fault_handler;
+ act.sa_handler = (SIG_PF)GC_write_fault_handler;
# else
act.sa_flags = SA_RESTART | SA_SIGINFO;
act.sa_sigaction = GC_write_fault_handler;
# endif
(void)sigemptyset(&act.sa_mask);
+# ifdef SIG_SUSPEND
+ /* Arrange to postpone SIG_SUSPEND while we're in a write fault */
+ /* handler. This effectively makes the handler atomic w.r.t. */
+ /* stopping the world for GC. */
+ (void)sigaddset(&act.sa_mask, SIG_SUSPEND);
+# endif /* SIG_SUSPEND */
# endif
-# if defined(MACOSX)
- struct sigaction act, oldact;
-
- act.sa_flags = SA_RESTART;
- act.sa_handler = GC_write_fault_handler;
- sigemptyset(&act.sa_mask);
-# endif
# ifdef PRINTSTATS
GC_printf0("Inititalizing mprotect virtual dirty bit implementation\n");
# endif
GC_err_printf0("Page size not multiple of HBLKSIZE\n");
ABORT("Page size not multiple of HBLKSIZE");
}
-# if defined(SUNOS4) || defined(FREEBSD)
+# if defined(SUNOS4) || (defined(FREEBSD) && !defined(SUNOS5SIGS))
GC_old_bus_handler = signal(SIGBUS, GC_write_fault_handler);
if (GC_old_bus_handler == SIG_IGN) {
GC_err_printf0("Previously ignored bus error!?");
# endif
}
# endif
-# if defined(OSF1) || defined(SUNOS4) || defined(LINUX)
+# if defined(SUNOS4)
GC_old_segv_handler = signal(SIGSEGV, (SIG_PF)GC_write_fault_handler);
if (GC_old_segv_handler == SIG_IGN) {
GC_err_printf0("Previously ignored segmentation violation!?");
# endif
}
# endif
-# if defined(SUNOS5SIGS) || defined(IRIX5)
-# if defined(IRIX_THREADS)
+# if (defined(SUNOS5SIGS) && !defined(FREEBSD)) || defined(IRIX5) \
+ || defined(LINUX) || defined(OSF1) || defined(HURD)
+ /* SUNOS5SIGS includes HPUX */
+# if defined(GC_IRIX_THREADS)
sigaction(SIGSEGV, 0, &oldact);
sigaction(SIGSEGV, &act, 0);
-# else
- sigaction(SIGSEGV, &act, &oldact);
+# else
+ {
+ int res = sigaction(SIGSEGV, &act, &oldact);
+ if (res != 0) ABORT("Sigaction failed");
+ }
# endif
-# if defined(_sigargs)
+# if defined(_sigargs) || defined(HURD) || !defined(SA_SIGINFO)
/* This is Irix 5.x, not 6.x. Irix 5.x does not have */
/* sa_sigaction. */
GC_old_segv_handler = oldact.sa_handler;
-# else /* Irix 6.x or SUNOS5SIGS */
+# else /* Irix 6.x or SUNOS5SIGS or LINUX */
if (oldact.sa_flags & SA_SIGINFO) {
GC_old_segv_handler = (SIG_PF)(oldact.sa_sigaction);
} else {
GC_err_printf0("Replaced other SIGSEGV handler\n");
# endif
}
-# endif
-# if defined(MACOSX) || defined(HPUX)
+# endif /* (SUNOS5SIGS && !FREEBSD) || IRIX5 || LINUX || OSF1 || HURD */
+# if defined(HPUX) || defined(LINUX) || defined(HURD) \
+ || (defined(FREEBSD) && defined(SUNOS5SIGS))
sigaction(SIGBUS, &act, &oldact);
GC_old_bus_handler = oldact.sa_handler;
if (GC_old_bus_handler == SIG_IGN) {
GC_err_printf0("Replaced other SIGBUS handler\n");
# endif
}
-# endif /* MACOS || HPUX */
+# endif /* HPUX || LINUX || HURD || (FREEBSD && SUNOS5SIGS) */
# if defined(MSWIN32)
GC_old_segv_handler = SetUnhandledExceptionFilter(GC_write_fault_handler);
if (GC_old_segv_handler != NULL) {
}
# endif
}
+#endif /* !DARWIN */
+
+int GC_incremental_protection_needs()
+{
+ if (GC_page_size == HBLKSIZE) {
+ return GC_PROTECTS_POINTER_HEAP;
+ } else {
+ return GC_PROTECTS_POINTER_HEAP | GC_PROTECTS_PTRFREE_HEAP;
+ }
+}
+#define HAVE_INCREMENTAL_PROTECTION_NEEDS
+#define IS_PTRFREE(hhdr) ((hhdr)->hb_descr == 0)
+#define PAGE_ALIGNED(x) !((word)(x) & (GC_page_size - 1))
void GC_protect_heap()
{
ptr_t start;
word len;
+ struct hblk * current;
+ struct hblk * current_start; /* Start of block to be protected. */
+ struct hblk * limit;
unsigned i;
-
+ GC_bool protect_all =
+ (0 != (GC_incremental_protection_needs() & GC_PROTECTS_PTRFREE_HEAP));
for (i = 0; i < GC_n_heap_sects; i++) {
start = GC_heap_sects[i].hs_start;
len = GC_heap_sects[i].hs_bytes;
- PROTECT(start, len);
+ if (protect_all) {
+ PROTECT(start, len);
+ } else {
+ GC_ASSERT(PAGE_ALIGNED(len))
+ GC_ASSERT(PAGE_ALIGNED(start))
+ current_start = current = (struct hblk *)start;
+ limit = (struct hblk *)(start + len);
+ while (current < limit) {
+ hdr * hhdr;
+ word nhblks;
+ GC_bool is_ptrfree;
+
+ GC_ASSERT(PAGE_ALIGNED(current));
+ GET_HDR(current, hhdr);
+ if (IS_FORWARDING_ADDR_OR_NIL(hhdr)) {
+ /* This can happen only if we're at the beginning of a */
+ /* heap segment, and a block spans heap segments. */
+ /* We will handle that block as part of the preceding */
+ /* segment. */
+ GC_ASSERT(current_start == current);
+ current_start = ++current;
+ continue;
+ }
+ if (HBLK_IS_FREE(hhdr)) {
+ GC_ASSERT(PAGE_ALIGNED(hhdr -> hb_sz));
+ nhblks = divHBLKSZ(hhdr -> hb_sz);
+ is_ptrfree = TRUE; /* dirty on alloc */
+ } else {
+ nhblks = OBJ_SZ_TO_BLOCKS(hhdr -> hb_sz);
+ is_ptrfree = IS_PTRFREE(hhdr);
+ }
+ if (is_ptrfree) {
+ if (current_start < current) {
+ PROTECT(current_start, (ptr_t)current - (ptr_t)current_start);
+ }
+ current_start = (current += nhblks);
+ } else {
+ current += nhblks;
+ }
+ }
+ if (current_start < current) {
+ PROTECT(current_start, (ptr_t)current - (ptr_t)current_start);
+ }
+ }
}
}
register struct hblk *h;
ptr_t obj_start;
- if (!GC_incremental) return;
+ if (!GC_dirty_maintained) return;
obj_start = GC_base(addr);
if (obj_start == 0) return;
if (GC_base(addr + len - 1) != obj_start) {
((ptr_t)end_block - (ptr_t)start_block) + HBLKSIZE);
}
-#if !defined(MSWIN32) && !defined(MSWINCE) && !defined(LINUX_THREADS) \
- && !defined(GC_USE_LD_WRAP)
-/* Replacement for UNIX system call. */
-/* Other calls that write to the heap */
-/* should be handled similarly. */
+#if 0
+
+/* We no longer wrap read by default, since that was causing too many */
+/* problems. It is preferred that the client instead avoids writing */
+/* to the write-protected heap with a system call. */
+/* This still serves as sample code if you do want to wrap system calls.*/
+
+#if !defined(MSWIN32) && !defined(MSWINCE) && !defined(GC_USE_LD_WRAP)
+/* Replacement for UNIX system call. */
+/* Other calls that write to the heap should be handled similarly. */
+/* Note that this doesn't work well for blocking reads: It will hold */
+/* the allocation lock for the entire duration of the call. Multithreaded */
+/* clients should really ensure that it won't block, either by setting */
+/* the descriptor nonblocking, or by calling select or poll first, to */
+/* make sure that input is available. */
+/* Another, preferred alternative is to ensure that system calls never */
+/* write to the protected heap (see above). */
# if defined(__STDC__) && !defined(SUNOS4)
# include <unistd.h>
# include <sys/uio.h>
GC_begin_syscall();
GC_unprotect_range(buf, (word)nbyte);
-# if defined(IRIX5) || defined(LINUX_THREADS)
+# if defined(IRIX5) || defined(GC_LINUX_THREADS)
/* Indirect system call may not always be easily available. */
/* We could call _read, but that would interfere with the */
/* libpthread interception of read. */
result = readv(fd, &iov, 1);
}
# else
+# if defined(HURD)
+ result = __read(fd, buf, nbyte);
+# else
/* The two zero args at the end of this list are because one
IA-64 syscall() implementation actually requires six args
to be passed, even though they aren't always used. */
result = syscall(SYS_read, fd, buf, nbyte, 0, 0);
+# endif /* !HURD */
# endif
GC_end_syscall();
return(result);
}
-#endif /* !MSWIN32 && !MSWINCE && !LINUX_THREADS */
+#endif /* !MSWIN32 && !MSWINCE && !GC_LINUX_THREADS */
-#ifdef GC_USE_LD_WRAP
+#if defined(GC_USE_LD_WRAP) && !defined(THREADS)
/* We use the GNU ld call wrapping facility. */
/* This requires that the linker be invoked with "--wrap read". */
/* This can be done by passing -Wl,"--wrap read" to gcc. */
/* actually calls. */
#endif
+#endif /* 0 */
+
/*ARGSUSED*/
GC_bool GC_page_was_ever_dirty(h)
struct hblk *h;
{
}
-# else /* !MPROTECT_VDB */
-
-# ifdef GC_USE_LD_WRAP
- ssize_t __wrap_read(int fd, void *buf, size_t nbyte)
- { return __real_read(fd, buf, nbyte); }
-# endif
-
# endif /* MPROTECT_VDB */
# ifdef PROC_VDB
#include <sys/procfs.h>
#include <sys/stat.h>
-#define INITIAL_BUF_SZ 4096
+#define INITIAL_BUF_SZ 16384
word GC_proc_buf_size = INITIAL_BUF_SZ;
char *GC_proc_buf;
-#ifdef SOLARIS_THREADS
+#ifdef GC_SOLARIS_THREADS
/* We don't have exact sp values for threads. So we count on */
/* occasionally declaring stack pages to be fresh. Thus we */
/* need a real implementation of GC_is_fresh. We can't clear */
}
GC_proc_fd = syscall(SYS_ioctl, fd, PIOCOPENPD, 0);
close(fd);
+ syscall(SYS_fcntl, GC_proc_fd, F_SETFD, FD_CLOEXEC);
if (GC_proc_fd < 0) {
ABORT("/proc ioctl failed");
}
GC_proc_buf = GC_scratch_alloc(GC_proc_buf_size);
-# ifdef SOLARIS_THREADS
+# ifdef GC_SOLARIS_THREADS
GC_fresh_pages = (struct hblk **)
GC_scratch_alloc(MAX_FRESH_PAGES * sizeof (struct hblk *));
if (GC_fresh_pages == 0) {
/* Ignore write hints. They don't help us here. */
/*ARGSUSED*/
-void GC_write_hint(h)
+void GC_remove_protection(h, nblocks, is_ptrfree)
struct hblk *h;
+word nblocks;
+GC_bool is_ptrfree;
{
}
-#ifdef SOLARIS_THREADS
+#ifdef GC_SOLARIS_THREADS
# define READ(fd,buf,nbytes) syscall(SYS_read, fd, buf, nbytes)
#else
# define READ(fd,buf,nbytes) read(fd, buf, nbytes)
GC_proc_buf = bufp = new_buf;
GC_proc_buf_size = new_size;
}
- if (syscall(SYS_read, GC_proc_fd, bufp, GC_proc_buf_size) <= 0) {
+ if (READ(GC_proc_fd, bufp, GC_proc_buf_size) <= 0) {
WARN("Insufficient space for /proc read\n", 0);
/* Punt: */
memset(GC_grungy_pages, 0xff, sizeof (page_hash_table));
memset(GC_written_pages, 0xff, sizeof(page_hash_table));
-# ifdef SOLARIS_THREADS
+# ifdef GC_SOLARIS_THREADS
BZERO(GC_fresh_pages,
MAX_FRESH_PAGES * sizeof (struct hblk *));
# endif
register word index = PHT_HASH(h);
set_pht_entry_from_index(GC_grungy_pages, index);
-# ifdef SOLARIS_THREADS
+# ifdef GC_SOLARIS_THREADS
{
register int slot = FRESH_PAGE_SLOT(h);
}
/* Update GC_written_pages. */
GC_or_pages(GC_written_pages, GC_grungy_pages);
-# ifdef SOLARIS_THREADS
+# ifdef GC_SOLARIS_THREADS
/* Make sure that old stacks are considered completely clean */
/* unless written again. */
GC_old_stacks_are_fresh();
register GC_bool result;
result = get_pht_entry_from_index(GC_grungy_pages, index);
-# ifdef SOLARIS_THREADS
+# ifdef GC_SOLARIS_THREADS
if (result && PAGE_IS_FRESH(h)) result = FALSE;
/* This happens only if page was declared fresh since */
/* the read_dirty call, e.g. because it's in an unused */
register GC_bool result;
result = get_pht_entry_from_index(GC_written_pages, index);
-# ifdef SOLARIS_THREADS
+# ifdef GC_SOLARIS_THREADS
if (result && PAGE_IS_FRESH(h)) result = FALSE;
# endif
return(result);
register word index;
-# ifdef SOLARIS_THREADS
+# ifdef GC_SOLARIS_THREADS
register word i;
if (GC_fresh_pages != 0) {
}
/*ARGSUSED*/
-void GC_write_hint(h)
+void GC_remove_protection(h, nblocks, is_ptrfree)
struct hblk *h;
+word nblocks;
+GC_bool is_ptrfree;
{
- PCR_VD_WriteProtectDisable(h, HBLKSIZE);
- PCR_VD_WriteProtectEnable(h, HBLKSIZE);
+ PCR_VD_WriteProtectDisable(h, nblocks*HBLKSIZE);
+ PCR_VD_WriteProtectEnable(h, nblocks*HBLKSIZE);
}
# endif /* PCR_VDB */
+#if defined(MPROTECT_VDB) && defined(DARWIN)
+/* The following sources were used as a *reference* for this exception handling
+ code:
+ 1. Apple's mach/xnu documentation
+ 2. Timothy J. Wood's "Mach Exception Handlers 101" post to the
+ omnigroup's macosx-dev list.
+ www.omnigroup.com/mailman/archive/macosx-dev/2000-June/014178.html
+ 3. macosx-nat.c from Apple's GDB source code.
+*/
+
+/* The bug that caused all this trouble should now be fixed. This should
+ eventually be removed if all goes well. */
+/* define BROKEN_EXCEPTION_HANDLING */
+
+#include <mach/mach.h>
+#include <mach/mach_error.h>
+#include <mach/thread_status.h>
+#include <mach/exception.h>
+#include <mach/task.h>
+#include <pthread.h>
+
+/* These are not defined in any header, although they are documented */
+extern boolean_t exc_server(mach_msg_header_t *,mach_msg_header_t *);
+extern kern_return_t exception_raise(
+ mach_port_t,mach_port_t,mach_port_t,
+ exception_type_t,exception_data_t,mach_msg_type_number_t);
+extern kern_return_t exception_raise_state(
+ mach_port_t,mach_port_t,mach_port_t,
+ exception_type_t,exception_data_t,mach_msg_type_number_t,
+ thread_state_flavor_t*,thread_state_t,mach_msg_type_number_t,
+ thread_state_t,mach_msg_type_number_t*);
+extern kern_return_t exception_raise_state_identity(
+ mach_port_t,mach_port_t,mach_port_t,
+ exception_type_t,exception_data_t,mach_msg_type_number_t,
+ thread_state_flavor_t*,thread_state_t,mach_msg_type_number_t,
+ thread_state_t,mach_msg_type_number_t*);
+
+
+#define MAX_EXCEPTION_PORTS 16
+
+static struct {
+ mach_msg_type_number_t count;
+ exception_mask_t masks[MAX_EXCEPTION_PORTS];
+ exception_handler_t ports[MAX_EXCEPTION_PORTS];
+ exception_behavior_t behaviors[MAX_EXCEPTION_PORTS];
+ thread_state_flavor_t flavors[MAX_EXCEPTION_PORTS];
+} GC_old_exc_ports;
+
+static struct {
+ mach_port_t exception;
+#if defined(THREADS)
+ mach_port_t reply;
+#endif
+} GC_ports;
+
+typedef struct {
+ mach_msg_header_t head;
+} GC_msg_t;
+
+typedef enum {
+ GC_MP_NORMAL, GC_MP_DISCARDING, GC_MP_STOPPED
+} GC_mprotect_state_t;
+
+/* FIXME: 1 and 2 seem to be safe to use in the msgh_id field,
+ but it isn't documented. Use the source and see if they
+ should be ok. */
+#define ID_STOP 1
+#define ID_RESUME 2
+
+/* These values are only used on the reply port */
+#define ID_ACK 3
+
+#if defined(THREADS)
+
+GC_mprotect_state_t GC_mprotect_state;
+
+/* The following should ONLY be called when the world is stopped */
+static void GC_mprotect_thread_notify(mach_msg_id_t id) {
+ struct {
+ GC_msg_t msg;
+ mach_msg_trailer_t trailer;
+ } buf;
+ mach_msg_return_t r;
+ /* remote, local */
+ buf.msg.head.msgh_bits =
+ MACH_MSGH_BITS(MACH_MSG_TYPE_MAKE_SEND,0);
+ buf.msg.head.msgh_size = sizeof(buf.msg);
+ buf.msg.head.msgh_remote_port = GC_ports.exception;
+ buf.msg.head.msgh_local_port = MACH_PORT_NULL;
+ buf.msg.head.msgh_id = id;
+
+ r = mach_msg(
+ &buf.msg.head,
+ MACH_SEND_MSG|MACH_RCV_MSG|MACH_RCV_LARGE,
+ sizeof(buf.msg),
+ sizeof(buf),
+ GC_ports.reply,
+ MACH_MSG_TIMEOUT_NONE,
+ MACH_PORT_NULL);
+ if(r != MACH_MSG_SUCCESS)
+ ABORT("mach_msg failed in GC_mprotect_thread_notify");
+ if(buf.msg.head.msgh_id != ID_ACK)
+ ABORT("invalid ack in GC_mprotect_thread_notify");
+}
+
+/* Should only be called by the mprotect thread */
+static void GC_mprotect_thread_reply() {
+ GC_msg_t msg;
+ mach_msg_return_t r;
+ /* remote, local */
+ msg.head.msgh_bits =
+ MACH_MSGH_BITS(MACH_MSG_TYPE_MAKE_SEND,0);
+ msg.head.msgh_size = sizeof(msg);
+ msg.head.msgh_remote_port = GC_ports.reply;
+ msg.head.msgh_local_port = MACH_PORT_NULL;
+ msg.head.msgh_id = ID_ACK;
+
+ r = mach_msg(
+ &msg.head,
+ MACH_SEND_MSG,
+ sizeof(msg),
+ 0,
+ MACH_PORT_NULL,
+ MACH_MSG_TIMEOUT_NONE,
+ MACH_PORT_NULL);
+ if(r != MACH_MSG_SUCCESS)
+ ABORT("mach_msg failed in GC_mprotect_thread_reply");
+}
+
+void GC_mprotect_stop() {
+ GC_mprotect_thread_notify(ID_STOP);
+}
+void GC_mprotect_resume() {
+ GC_mprotect_thread_notify(ID_RESUME);
+}
+
+#else /* !THREADS */
+/* The compiler should optimize away any GC_mprotect_state computations */
+#define GC_mprotect_state GC_MP_NORMAL
+#endif
+
+static void *GC_mprotect_thread(void *arg) {
+ mach_msg_return_t r;
+ /* These two structures contain some private kernel data. We don't need to
+ access any of it so we don't bother defining a proper struct. The
+ correct definitions are in the xnu source code. */
+ struct {
+ mach_msg_header_t head;
+ char data[256];
+ } reply;
+ struct {
+ mach_msg_header_t head;
+ mach_msg_body_t msgh_body;
+ char data[1024];
+ } msg;
+
+ mach_msg_id_t id;
+
+ GC_darwin_register_mach_handler_thread(mach_thread_self());
+
+ for(;;) {
+ r = mach_msg(
+ &msg.head,
+ MACH_RCV_MSG|MACH_RCV_LARGE|
+ (GC_mprotect_state == GC_MP_DISCARDING ? MACH_RCV_TIMEOUT : 0),
+ 0,
+ sizeof(msg),
+ GC_ports.exception,
+ GC_mprotect_state == GC_MP_DISCARDING ? 0 : MACH_MSG_TIMEOUT_NONE,
+ MACH_PORT_NULL);
+
+ id = r == MACH_MSG_SUCCESS ? msg.head.msgh_id : -1;
+
+#if defined(THREADS)
+ if(GC_mprotect_state == GC_MP_DISCARDING) {
+ if(r == MACH_RCV_TIMED_OUT) {
+ GC_mprotect_state = GC_MP_STOPPED;
+ GC_mprotect_thread_reply();
+ continue;
+ }
+ if(r == MACH_MSG_SUCCESS && (id == ID_STOP || id == ID_RESUME))
+ ABORT("out of order mprotect thread request");
+ }
+#endif
+
+ if(r != MACH_MSG_SUCCESS) {
+ GC_err_printf2("mach_msg failed with %d %s\n",
+ (int)r,mach_error_string(r));
+ ABORT("mach_msg failed");
+ }
+
+ switch(id) {
+#if defined(THREADS)
+ case ID_STOP:
+ if(GC_mprotect_state != GC_MP_NORMAL)
+ ABORT("Called mprotect_stop when state wasn't normal");
+ GC_mprotect_state = GC_MP_DISCARDING;
+ break;
+ case ID_RESUME:
+ if(GC_mprotect_state != GC_MP_STOPPED)
+ ABORT("Called mprotect_resume when state wasn't stopped");
+ GC_mprotect_state = GC_MP_NORMAL;
+ GC_mprotect_thread_reply();
+ break;
+#endif /* THREADS */
+ default:
+ /* Handle the message (calls catch_exception_raise) */
+ if(!exc_server(&msg.head,&reply.head))
+ ABORT("exc_server failed");
+ /* Send the reply */
+ r = mach_msg(
+ &reply.head,
+ MACH_SEND_MSG,
+ reply.head.msgh_size,
+ 0,
+ MACH_PORT_NULL,
+ MACH_MSG_TIMEOUT_NONE,
+ MACH_PORT_NULL);
+ if(r != MACH_MSG_SUCCESS) {
+ /* This will fail if the thread dies, but the thread shouldn't
+ die... */
+ #ifdef BROKEN_EXCEPTION_HANDLING
+ GC_err_printf2(
+ "mach_msg failed with %d %s while sending exc reply\n",
+ (int)r,mach_error_string(r));
+ #else
+ ABORT("mach_msg failed while sending exception reply");
+ #endif
+ }
+ } /* switch */
+ } /* for(;;) */
+ /* NOT REACHED */
+ return NULL;
+}
+
+/* All this SIGBUS code shouldn't be necessary. All protection faults should
+ be going throught the mach exception handler. However, it seems a SIGBUS is
+ occasionally sent for some unknown reason. Even more odd, it seems to be
+ meaningless and safe to ignore. */
+#ifdef BROKEN_EXCEPTION_HANDLING
+
+typedef void (* SIG_PF)();
+static SIG_PF GC_old_bus_handler;
+
+/* Updates to this aren't atomic, but the SIGBUSs seem pretty rare.
+ Even if this doesn't get updated property, it isn't really a problem */
+static int GC_sigbus_count;
+
+static void GC_darwin_sigbus(int num,siginfo_t *sip,void *context) {
+ if(num != SIGBUS) ABORT("Got a non-sigbus signal in the sigbus handler");
+
+ /* Ugh... some seem safe to ignore, but too many in a row probably means
+ trouble. GC_sigbus_count is reset for each mach exception that is
+ handled */
+ if(GC_sigbus_count >= 8) {
+ ABORT("Got more than 8 SIGBUSs in a row!");
+ } else {
+ GC_sigbus_count++;
+ GC_err_printf0("GC: WARNING: Ignoring SIGBUS.\n");
+ }
+}
+#endif /* BROKEN_EXCEPTION_HANDLING */
+
+void GC_dirty_init() {
+ kern_return_t r;
+ mach_port_t me;
+ pthread_t thread;
+ pthread_attr_t attr;
+ exception_mask_t mask;
+
+# ifdef PRINTSTATS
+ GC_printf0("Inititalizing mach/darwin mprotect virtual dirty bit "
+ "implementation\n");
+# endif
+# ifdef BROKEN_EXCEPTION_HANDLING
+ GC_err_printf0("GC: WARNING: Enabling workarounds for various darwin "
+ "exception handling bugs.\n");
+# endif
+ GC_dirty_maintained = TRUE;
+ if (GC_page_size % HBLKSIZE != 0) {
+ GC_err_printf0("Page size not multiple of HBLKSIZE\n");
+ ABORT("Page size not multiple of HBLKSIZE");
+ }
+
+ GC_task_self = me = mach_task_self();
+
+ r = mach_port_allocate(me,MACH_PORT_RIGHT_RECEIVE,&GC_ports.exception);
+ if(r != KERN_SUCCESS) ABORT("mach_port_allocate failed (exception port)");
+
+ r = mach_port_insert_right(me,GC_ports.exception,GC_ports.exception,
+ MACH_MSG_TYPE_MAKE_SEND);
+ if(r != KERN_SUCCESS)
+ ABORT("mach_port_insert_right failed (exception port)");
+
+ #if defined(THREADS)
+ r = mach_port_allocate(me,MACH_PORT_RIGHT_RECEIVE,&GC_ports.reply);
+ if(r != KERN_SUCCESS) ABORT("mach_port_allocate failed (reply port)");
+ #endif
+
+ /* The exceptions we want to catch */
+ mask = EXC_MASK_BAD_ACCESS;
+
+ r = task_get_exception_ports(
+ me,
+ mask,
+ GC_old_exc_ports.masks,
+ &GC_old_exc_ports.count,
+ GC_old_exc_ports.ports,
+ GC_old_exc_ports.behaviors,
+ GC_old_exc_ports.flavors
+ );
+ if(r != KERN_SUCCESS) ABORT("task_get_exception_ports failed");
+
+ r = task_set_exception_ports(
+ me,
+ mask,
+ GC_ports.exception,
+ EXCEPTION_DEFAULT,
+ GC_MACH_THREAD_STATE
+ );
+ if(r != KERN_SUCCESS) ABORT("task_set_exception_ports failed");
+
+ if(pthread_attr_init(&attr) != 0) ABORT("pthread_attr_init failed");
+ if(pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED) != 0)
+ ABORT("pthread_attr_setdetachedstate failed");
+
+# undef pthread_create
+ /* This will call the real pthread function, not our wrapper */
+ if(pthread_create(&thread,&attr,GC_mprotect_thread,NULL) != 0)
+ ABORT("pthread_create failed");
+ pthread_attr_destroy(&attr);
+
+ /* Setup the sigbus handler for ignoring the meaningless SIGBUSs */
+ #ifdef BROKEN_EXCEPTION_HANDLING
+ {
+ struct sigaction sa, oldsa;
+ sa.sa_handler = (SIG_PF)GC_darwin_sigbus;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = SA_RESTART|SA_SIGINFO;
+ if(sigaction(SIGBUS,&sa,&oldsa) < 0) ABORT("sigaction");
+ GC_old_bus_handler = (SIG_PF)oldsa.sa_handler;
+ if (GC_old_bus_handler != SIG_DFL) {
+# ifdef PRINTSTATS
+ GC_err_printf0("Replaced other SIGBUS handler\n");
+# endif
+ }
+ }
+ #endif /* BROKEN_EXCEPTION_HANDLING */
+}
+
+/* The source code for Apple's GDB was used as a reference for the exception
+ forwarding code. This code is similar to be GDB code only because there is
+ only one way to do it. */
+static kern_return_t GC_forward_exception(
+ mach_port_t thread,
+ mach_port_t task,
+ exception_type_t exception,
+ exception_data_t data,
+ mach_msg_type_number_t data_count
+) {
+ int i;
+ kern_return_t r;
+ mach_port_t port;
+ exception_behavior_t behavior;
+ thread_state_flavor_t flavor;
+
+ thread_state_t thread_state;
+ mach_msg_type_number_t thread_state_count = THREAD_STATE_MAX;
+
+ for(i=0;i<GC_old_exc_ports.count;i++)
+ if(GC_old_exc_ports.masks[i] & (1 << exception))
+ break;
+ if(i==GC_old_exc_ports.count) ABORT("No handler for exception!");
+
+ port = GC_old_exc_ports.ports[i];
+ behavior = GC_old_exc_ports.behaviors[i];
+ flavor = GC_old_exc_ports.flavors[i];
+
+ if(behavior != EXCEPTION_DEFAULT) {
+ r = thread_get_state(thread,flavor,thread_state,&thread_state_count);
+ if(r != KERN_SUCCESS)
+ ABORT("thread_get_state failed in forward_exception");
+ }
+
+ switch(behavior) {
+ case EXCEPTION_DEFAULT:
+ r = exception_raise(port,thread,task,exception,data,data_count);
+ break;
+ case EXCEPTION_STATE:
+ r = exception_raise_state(port,thread,task,exception,data,
+ data_count,&flavor,thread_state,thread_state_count,
+ thread_state,&thread_state_count);
+ break;
+ case EXCEPTION_STATE_IDENTITY:
+ r = exception_raise_state_identity(port,thread,task,exception,data,
+ data_count,&flavor,thread_state,thread_state_count,
+ thread_state,&thread_state_count);
+ break;
+ default:
+ r = KERN_FAILURE; /* make gcc happy */
+ ABORT("forward_exception: unknown behavior");
+ break;
+ }
+
+ if(behavior != EXCEPTION_DEFAULT) {
+ r = thread_set_state(thread,flavor,thread_state,thread_state_count);
+ if(r != KERN_SUCCESS)
+ ABORT("thread_set_state failed in forward_exception");
+ }
+
+ return r;
+}
+
+#define FWD() GC_forward_exception(thread,task,exception,code,code_count)
+
+/* This violates the namespace rules but there isn't anything that can be done
+ about it. The exception handling stuff is hard coded to call this */
+kern_return_t
+catch_exception_raise(
+ mach_port_t exception_port,mach_port_t thread,mach_port_t task,
+ exception_type_t exception,exception_data_t code,
+ mach_msg_type_number_t code_count
+) {
+ kern_return_t r;
+ char *addr;
+ struct hblk *h;
+ int i;
+# if defined(POWERPC)
+# if CPP_WORDSZ == 32
+ thread_state_flavor_t flavor = PPC_EXCEPTION_STATE;
+ mach_msg_type_number_t exc_state_count = PPC_EXCEPTION_STATE_COUNT;
+ ppc_exception_state_t exc_state;
+# else
+ thread_state_flavor_t flavor = PPC_EXCEPTION_STATE64;
+ mach_msg_type_number_t exc_state_count = PPC_EXCEPTION_STATE64_COUNT;
+ ppc_exception_state64_t exc_state;
+# endif
+# elif defined(I386) || defined(X86_64)
+# if CPP_WORDSZ == 32
+ thread_state_flavor_t flavor = x86_EXCEPTION_STATE32;
+ mach_msg_type_number_t exc_state_count = x86_EXCEPTION_STATE32_COUNT;
+ x86_exception_state32_t exc_state;
+# else
+ thread_state_flavor_t flavor = x86_EXCEPTION_STATE64;
+ mach_msg_type_number_t exc_state_count = x86_EXCEPTION_STATE64_COUNT;
+ x86_exception_state64_t exc_state;
+# endif
+# else
+# error FIXME for non-ppc darwin
+# endif
+
+
+ if(exception != EXC_BAD_ACCESS || code[0] != KERN_PROTECTION_FAILURE) {
+ #ifdef DEBUG_EXCEPTION_HANDLING
+ /* We aren't interested, pass it on to the old handler */
+ GC_printf3("Exception: 0x%x Code: 0x%x 0x%x in catch....\n",
+ exception,
+ code_count > 0 ? code[0] : -1,
+ code_count > 1 ? code[1] : -1);
+ #endif
+ return FWD();
+ }
+
+ r = thread_get_state(thread,flavor,
+ (natural_t*)&exc_state,&exc_state_count);
+ if(r != KERN_SUCCESS) {
+ /* The thread is supposed to be suspended while the exception handler
+ is called. This shouldn't fail. */
+ #ifdef BROKEN_EXCEPTION_HANDLING
+ GC_err_printf0("thread_get_state failed in "
+ "catch_exception_raise\n");
+ return KERN_SUCCESS;
+ #else
+ ABORT("thread_get_state failed in catch_exception_raise");
+ #endif
+ }
+
+ /* This is the address that caused the fault */
+#if defined(POWERPC)
+ addr = (char*) exc_state. THREAD_FLD(dar);
+#elif defined (I386) || defined (X86_64)
+ addr = (char*) exc_state. THREAD_FLD(faultvaddr);
+#else
+# error FIXME for non POWERPC/I386
+#endif
+
+ if((HDR(addr)) == 0) {
+ /* Ugh... just like the SIGBUS problem above, it seems we get a bogus
+ KERN_PROTECTION_FAILURE every once and a while. We wait till we get
+ a bunch in a row before doing anything about it. If a "real" fault
+ ever occurres it'll just keep faulting over and over and we'll hit
+ the limit pretty quickly. */
+ #ifdef BROKEN_EXCEPTION_HANDLING
+ static char *last_fault;
+ static int last_fault_count;
+
+ if(addr != last_fault) {
+ last_fault = addr;
+ last_fault_count = 0;
+ }
+ if(++last_fault_count < 32) {
+ if(last_fault_count == 1)
+ GC_err_printf1(
+ "GC: WARNING: Ignoring KERN_PROTECTION_FAILURE at %p\n",
+ addr);
+ return KERN_SUCCESS;
+ }
+
+ GC_err_printf1("Unexpected KERN_PROTECTION_FAILURE at %p\n",addr);
+ /* Can't pass it along to the signal handler because that is
+ ignoring SIGBUS signals. We also shouldn't call ABORT here as
+ signals don't always work too well from the exception handler. */
+ GC_err_printf0("Aborting\n");
+ exit(EXIT_FAILURE);
+ #else /* BROKEN_EXCEPTION_HANDLING */
+ /* Pass it along to the next exception handler
+ (which should call SIGBUS/SIGSEGV) */
+ return FWD();
+ #endif /* !BROKEN_EXCEPTION_HANDLING */
+ }
+
+ #ifdef BROKEN_EXCEPTION_HANDLING
+ /* Reset the number of consecutive SIGBUSs */
+ GC_sigbus_count = 0;
+ #endif
+
+ if(GC_mprotect_state == GC_MP_NORMAL) { /* common case */
+ h = (struct hblk*)((word)addr & ~(GC_page_size-1));
+ UNPROTECT(h, GC_page_size);
+ for (i = 0; i < divHBLKSZ(GC_page_size); i++) {
+ register int index = PHT_HASH(h+i);
+ async_set_pht_entry_from_index(GC_dirty_pages, index);
+ }
+ } else if(GC_mprotect_state == GC_MP_DISCARDING) {
+ /* Lie to the thread for now. No sense UNPROTECT()ing the memory
+ when we're just going to PROTECT() it again later. The thread
+ will just fault again once it resumes */
+ } else {
+ /* Shouldn't happen, i don't think */
+ GC_printf0("KERN_PROTECTION_FAILURE while world is stopped\n");
+ return FWD();
+ }
+ return KERN_SUCCESS;
+}
+#undef FWD
+
+/* These should never be called, but just in case... */
+kern_return_t catch_exception_raise_state(mach_port_name_t exception_port,
+ int exception, exception_data_t code, mach_msg_type_number_t codeCnt,
+ int flavor, thread_state_t old_state, int old_stateCnt,
+ thread_state_t new_state, int new_stateCnt)
+{
+ ABORT("catch_exception_raise_state");
+ return(KERN_INVALID_ARGUMENT);
+}
+kern_return_t catch_exception_raise_state_identity(
+ mach_port_name_t exception_port, mach_port_t thread, mach_port_t task,
+ int exception, exception_data_t code, mach_msg_type_number_t codeCnt,
+ int flavor, thread_state_t old_state, int old_stateCnt,
+ thread_state_t new_state, int new_stateCnt)
+{
+ ABORT("catch_exception_raise_state_identity");
+ return(KERN_INVALID_ARGUMENT);
+}
+
+
+#endif /* DARWIN && MPROTECT_VDB */
+
+# ifndef HAVE_INCREMENTAL_PROTECTION_NEEDS
+ int GC_incremental_protection_needs()
+ {
+ return GC_PROTECTS_NONE;
+ }
+# endif /* !HAVE_INCREMENTAL_PROTECTION_NEEDS */
+
/*
* Call stack save code for debugging.
* Should probably be in mach_dep.c, but that requires reorganization.
/* long as the frame pointer is explicitly stored. In the case of gcc, */
/* compiler flags (e.g. -fomit-frame-pointer) determine whether it is. */
#if defined(I386) && defined(LINUX) && defined(SAVE_CALL_CHAIN)
+# include <features.h>
+
struct frame {
struct frame *fr_savfp;
long fr_savpc;
#if defined(SPARC)
# if defined(LINUX)
+# include <features.h>
+
struct frame {
long fr_local[8];
long fr_arg[6];
# if defined (DRSNX)
# include <sys/sparc/frame.h>
# else
-# if defined(OPENBSD) || defined(NETBSD)
+# if defined(OPENBSD)
# include <frame.h>
# else
-# include <sys/frame.h>
+# if defined(FREEBSD) || defined(NETBSD)
+# include <machine/frame.h>
+# else
+# include <sys/frame.h>
+# endif
# endif
# endif
# endif
# endif
#endif /* SPARC */
-#ifdef SAVE_CALL_CHAIN
+#ifdef NEED_CALLINFO
/* Fill in the pc and argument information for up to NFRAMES of my */
/* callers. Ignore my frame and my callers frame. */
-#if (defined(OPENBSD) || defined(NETBSD)) && defined(SPARC)
+#ifdef LINUX
+# include <unistd.h>
+#endif
+
+#endif /* NEED_CALLINFO */
+
+#if defined(GC_HAVE_BUILTIN_BACKTRACE)
+# include <execinfo.h>
+#endif
+
+#ifdef SAVE_CALL_CHAIN
+
+#if NARGS == 0 && NFRAMES % 2 == 0 /* No padding */ \
+ && defined(GC_HAVE_BUILTIN_BACKTRACE)
+
+#ifdef REDIRECT_MALLOC
+ /* Deal with possible malloc calls in backtrace by omitting */
+ /* the infinitely recursing backtrace. */
+# ifdef THREADS
+ __thread /* If your compiler doesn't understand this */
+ /* you could use something like pthread_getspecific. */
+# endif
+ GC_in_save_callers = FALSE;
+#endif
+
+void GC_save_callers (info)
+struct callinfo info[NFRAMES];
+{
+ void * tmp_info[NFRAMES + 1];
+ int npcs, i;
+# define IGNORE_FRAMES 1
+
+ /* We retrieve NFRAMES+1 pc values, but discard the first, since it */
+ /* points to our own frame. */
+# ifdef REDIRECT_MALLOC
+ if (GC_in_save_callers) {
+ info[0].ci_pc = (word)(&GC_save_callers);
+ for (i = 1; i < NFRAMES; ++i) info[i].ci_pc = 0;
+ return;
+ }
+ GC_in_save_callers = TRUE;
+# endif
+ GC_ASSERT(sizeof(struct callinfo) == sizeof(void *));
+ npcs = backtrace((void **)tmp_info, NFRAMES + IGNORE_FRAMES);
+ BCOPY(tmp_info+IGNORE_FRAMES, info, (npcs - IGNORE_FRAMES) * sizeof(void *));
+ for (i = npcs - IGNORE_FRAMES; i < NFRAMES; ++i) info[i].ci_pc = 0;
+# ifdef REDIRECT_MALLOC
+ GC_in_save_callers = FALSE;
+# endif
+}
+
+#else /* No builtin backtrace; do it ourselves */
+
+#if (defined(OPENBSD) || defined(NETBSD) || defined(FREEBSD)) && defined(SPARC)
# define FR_SAVFP fr_fp
# define FR_SAVPC fr_pc
#else
asm("movl %%ebp,%0" : "=r"(frame));
fp = frame;
# else
- word GC_save_regs_in_stack();
-
frame = (struct frame *) GC_save_regs_in_stack ();
fp = (struct frame *)((long) frame -> FR_SAVFP + BIAS);
#endif
register int i;
info[nframes].ci_pc = fp->FR_SAVPC;
- for (i = 0; i < NARGS; i++) {
- info[nframes].ci_arg[i] = ~(fp->fr_arg[i]);
- }
+# if NARGS > 0
+ for (i = 0; i < NARGS; i++) {
+ info[nframes].ci_arg[i] = ~(fp->fr_arg[i]);
+ }
+# endif /* NARGS > 0 */
}
if (nframes < NFRAMES) info[nframes].ci_pc = 0;
}
-#endif /* SAVE_CALL_CHAIN */
+#endif /* No builtin backtrace */
-#if defined(LINUX) && defined(__ELF__) && \
- (!defined(SMALL_CONFIG) || defined(USE_PROC_FOR_LIBRARIES))
-#ifdef GC_USE_LD_WRAP
-# define READ __real_read
-#else
-# define READ read
-#endif
+#endif /* SAVE_CALL_CHAIN */
+#ifdef NEED_CALLINFO
-/* Repeatedly perform a read call until the buffer is filled or */
-/* we encounter EOF. */
-ssize_t GC_repeat_read(int fd, char *buf, size_t count)
+/* Print info to stderr. We do NOT hold the allocation lock */
+void GC_print_callers (info)
+struct callinfo info[NFRAMES];
{
- ssize_t num_read = 0;
- ssize_t result;
+ register int i;
+ static int reentry_count = 0;
+ GC_bool stop = FALSE;
+
+ /* FIXME: This should probably use a different lock, so that we */
+ /* become callable with or without the allocation lock. */
+ LOCK();
+ ++reentry_count;
+ UNLOCK();
- while (num_read < count) {
- result = READ(fd, buf + num_read, count - num_read);
- if (result < 0) return result;
- if (result == 0) break;
- num_read += result;
+# if NFRAMES == 1
+ GC_err_printf0("\tCaller at allocation:\n");
+# else
+ GC_err_printf0("\tCall chain at allocation:\n");
+# endif
+ for (i = 0; i < NFRAMES && !stop ; i++) {
+ if (info[i].ci_pc == 0) break;
+# if NARGS > 0
+ {
+ int j;
+
+ GC_err_printf0("\t\targs: ");
+ for (j = 0; j < NARGS; j++) {
+ if (j != 0) GC_err_printf0(", ");
+ GC_err_printf2("%d (0x%X)", ~(info[i].ci_arg[j]),
+ ~(info[i].ci_arg[j]));
+ }
+ GC_err_printf0("\n");
+ }
+# endif
+ if (reentry_count > 1) {
+ /* We were called during an allocation during */
+ /* a previous GC_print_callers call; punt. */
+ GC_err_printf1("\t\t##PC##= 0x%lx\n", info[i].ci_pc);
+ continue;
+ }
+ {
+# ifdef LINUX
+ FILE *pipe;
+# endif
+# if defined(GC_HAVE_BUILTIN_BACKTRACE) \
+ && !defined(GC_BACKTRACE_SYMBOLS_BROKEN)
+ char **sym_name =
+ backtrace_symbols((void **)(&(info[i].ci_pc)), 1);
+ char *name = sym_name[0];
+# else
+ char buf[40];
+ char *name = buf;
+ sprintf(buf, "##PC##= 0x%lx", info[i].ci_pc);
+# endif
+# if defined(LINUX) && !defined(SMALL_CONFIG)
+ /* Try for a line number. */
+ {
+# define EXE_SZ 100
+ static char exe_name[EXE_SZ];
+# define CMD_SZ 200
+ char cmd_buf[CMD_SZ];
+# define RESULT_SZ 200
+ static char result_buf[RESULT_SZ];
+ size_t result_len;
+ char *old_preload;
+# define PRELOAD_SZ 200
+ char preload_buf[PRELOAD_SZ];
+ static GC_bool found_exe_name = FALSE;
+ static GC_bool will_fail = FALSE;
+ int ret_code;
+ /* Try to get it via a hairy and expensive scheme. */
+ /* First we get the name of the executable: */
+ if (will_fail) goto out;
+ if (!found_exe_name) {
+ ret_code = readlink("/proc/self/exe", exe_name, EXE_SZ);
+ if (ret_code < 0 || ret_code >= EXE_SZ
+ || exe_name[0] != '/') {
+ will_fail = TRUE; /* Dont try again. */
+ goto out;
+ }
+ exe_name[ret_code] = '\0';
+ found_exe_name = TRUE;
+ }
+ /* Then we use popen to start addr2line -e <exe> <addr> */
+ /* There are faster ways to do this, but hopefully this */
+ /* isn't time critical. */
+ sprintf(cmd_buf, "/usr/bin/addr2line -f -e %s 0x%lx", exe_name,
+ (unsigned long)info[i].ci_pc);
+ old_preload = getenv ("LD_PRELOAD");
+ if (0 != old_preload) {
+ if (strlen (old_preload) >= PRELOAD_SZ) {
+ will_fail = TRUE;
+ goto out;
+ }
+ strcpy (preload_buf, old_preload);
+ unsetenv ("LD_PRELOAD");
+ }
+ pipe = popen(cmd_buf, "r");
+ if (0 != old_preload
+ && 0 != setenv ("LD_PRELOAD", preload_buf, 0)) {
+ WARN("Failed to reset LD_PRELOAD\n", 0);
+ }
+ if (pipe == NULL
+ || (result_len = fread(result_buf, 1, RESULT_SZ - 1, pipe))
+ == 0) {
+ if (pipe != NULL) pclose(pipe);
+ will_fail = TRUE;
+ goto out;
+ }
+ if (result_buf[result_len - 1] == '\n') --result_len;
+ result_buf[result_len] = 0;
+ if (result_buf[0] == '?'
+ || result_buf[result_len-2] == ':'
+ && result_buf[result_len-1] == '0') {
+ pclose(pipe);
+ goto out;
+ }
+ /* Get rid of embedded newline, if any. Test for "main" */
+ {
+ char * nl = strchr(result_buf, '\n');
+ if (nl != NULL && nl < result_buf + result_len) {
+ *nl = ':';
+ }
+ if (strncmp(result_buf, "main", nl - result_buf) == 0) {
+ stop = TRUE;
+ }
+ }
+ if (result_len < RESULT_SZ - 25) {
+ /* Add in hex address */
+ sprintf(result_buf + result_len, " [0x%lx]",
+ (unsigned long)info[i].ci_pc);
+ }
+ name = result_buf;
+ pclose(pipe);
+ out:;
+ }
+# endif /* LINUX */
+ GC_err_printf1("\t\t%s\n", name);
+# if defined(GC_HAVE_BUILTIN_BACKTRACE) \
+ && !defined(GC_BACKTRACE_SYMBOLS_BROKEN)
+ free(sym_name); /* May call GC_free; that's OK */
+# endif
+ }
}
- return num_read;
+ LOCK();
+ --reentry_count;
+ UNLOCK();
}
-#endif /* LINUX && ... */
+
+#endif /* NEED_CALLINFO */
+
#if defined(LINUX) && defined(__ELF__) && !defined(SMALL_CONFIG)
/* Dump /proc/self/maps to GC_stderr, to enable looking up names for
addresses in FIND_LEAK output. */
+static word dump_maps(char *maps)
+{
+ GC_err_write(maps, strlen(maps));
+ return 1;
+}
+
void GC_print_address_map()
{
- int f;
- int result;
- char maps_temp[32768];
GC_err_printf0("---------- Begin address map ----------\n");
- f = open("/proc/self/maps", O_RDONLY);
- if (-1 == f) ABORT("Couldn't open /proc/self/maps");
- do {
- result = GC_repeat_read(f, maps_temp, sizeof(maps_temp));
- if (result <= 0) ABORT("Couldn't read /proc/self/maps");
- GC_err_write(maps_temp, result);
- } while (result == sizeof(maps_temp));
-
+ GC_apply_to_maps(dump_maps);
GC_err_printf0("---------- End address map ----------\n");
}