diff options
Diffstat (limited to 'boehm-gc/os_dep.c')
| -rw-r--r-- | boehm-gc/os_dep.c | 2611 |
1 files changed, 0 insertions, 2611 deletions
diff --git a/boehm-gc/os_dep.c b/boehm-gc/os_dep.c deleted file mode 100644 index 5bc41f1ddf6..00000000000 --- a/boehm-gc/os_dep.c +++ /dev/null @@ -1,2611 +0,0 @@ -/* - * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers - * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved. - * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved. - * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved. - * - * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED - * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. - * - * Permission is hereby granted to use or copy this program - * for any purpose, provided the above notices are retained on all copies. - * Permission to modify the code and to distribute modified code is granted, - * provided the above notices are retained, and a notice that the code was - * modified is included with the above copyright notice. - */ - -# include "gc_priv.h" - -# if defined(LINUX) && !defined(POWERPC) -# include <linux/version.h> -# if (LINUX_VERSION_CODE <= 0x10400) - /* Ugly hack to get struct sigcontext_struct definition. Required */ - /* for some early 1.3.X releases. Will hopefully go away soon. */ - /* in some later Linux releases, asm/sigcontext.h may have to */ - /* be included instead. */ -# define __KERNEL__ -# include <asm/signal.h> -# undef __KERNEL__ -# else - /* Kernels prior to 2.1.1 defined struct sigcontext_struct instead of */ - /* struct sigcontext. libc6 (glibc2) uses "struct sigcontext" in */ - /* prototypes, so we have to include the top-level sigcontext.h to */ - /* make sure the former gets defined to be the latter if appropriate. */ -# include <features.h> -# if 2 <= __GLIBC__ -# if 2 == __GLIBC__ && 0 == __GLIBC_MINOR__ - /* glibc 2.1 no longer has sigcontext.h. But signal.h */ - /* has the right declaration for glibc 2.1. */ -# include <sigcontext.h> -# endif /* 0 == __GLIBC_MINOR__ */ -# else /* not 2 <= __GLIBC__ */ - /* libc5 doesn't have <sigcontext.h>: go directly with the kernel */ - /* one. Check LINUX_VERSION_CODE to see which we should reference. */ -# include <asm/sigcontext.h> -# endif /* 2 <= __GLIBC__ */ -# endif -# endif -# if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS) -# include <sys/types.h> -# if !defined(MSWIN32) && !defined(SUNOS4) -# include <unistd.h> -# endif -# endif - -# include <stdio.h> -# include <signal.h> - -/* Blatantly OS dependent routines, except for those that are related */ -/* to dynamic loading. */ - -# if !defined(THREADS) && !defined(STACKBOTTOM) && defined(HEURISTIC2) -# define NEED_FIND_LIMIT -# endif - -# if defined(IRIX_THREADS) || defined(HPUX_THREADS) -# define NEED_FIND_LIMIT -# endif - -# if (defined(SUNOS4) & defined(DYNAMIC_LOADING)) && !defined(PCR) -# define NEED_FIND_LIMIT -# endif - -# if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR) -# define NEED_FIND_LIMIT -# endif - -# if defined(LINUX) && \ - (defined(SPARC) || defined(IA64)) -# define NEED_FIND_LIMIT -# endif - -#ifdef NEED_FIND_LIMIT -# include <setjmp.h> -#endif - -#ifdef FREEBSD -# include <machine/trap.h> -#endif - -#ifdef AMIGA -# include <proto/exec.h> -# include <proto/dos.h> -# include <dos/dosextens.h> -# include <workbench/startup.h> -#endif - -#ifdef MSWIN32 -# define WIN32_LEAN_AND_MEAN -# define NOSERVICE -# include <windows.h> -#endif - -#ifdef MACOS -# include <Processes.h> -#endif - -#ifdef IRIX5 -# include <sys/uio.h> -# include <malloc.h> /* for locking */ -#endif -#ifdef USE_MMAP -# include <sys/types.h> -# include <sys/mman.h> -# include <sys/stat.h> -# include <fcntl.h> -#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 -#endif - -#ifdef DJGPP - /* Apparently necessary for djgpp 2.01. May casuse problems with */ - /* other versions. */ - typedef long unsigned int caddr_t; -#endif - -#ifdef PCR -# include "il/PCR_IL.h" -# include "th/PCR_ThCtl.h" -# include "mm/PCR_MM.h" -#endif - -#if !defined(NO_EXECUTE_PERMISSION) -# define OPT_PROT_EXEC PROT_EXEC -#else -# define OPT_PROT_EXEC 0 -#endif - -#if defined(LINUX) && (defined(SPARC) || defined(IA64)) - /* The I386 case can be handled without a search. The Alpha case */ - /* used to be handled differently as well, but the rules changed */ - /* for recent Linux versions. This seems to be the easiest way to */ - /* cover all versions. */ - ptr_t GC_data_start; - - extern char * GC_copyright[]; /* Any data symbol would do. */ - - void GC_init_linux_data_start() - { - extern ptr_t GC_find_limit(); - - GC_data_start = GC_find_limit((ptr_t)GC_copyright, FALSE); - } -#endif - -# ifdef ECOS - -# ifndef ECOS_GC_MEMORY_SIZE -# define ECOS_GC_MEMORY_SIZE (448 * 1024) -# endif /* ECOS_GC_MEMORY_SIZE */ - -// setjmp() function, as described in ANSI para 7.6.1.1 -#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 -// sophisticated means of allocating memory than this simple static -// allocator, but this method is at least bound to work. -static char memory[ECOS_GC_MEMORY_SIZE]; -static char *brk = memory; - -static void *tiny_sbrk(ptrdiff_t increment) -{ - void *p = brk; - - brk += increment; - - if (brk > memory + sizeof memory) - { - brk -= increment; - return NULL; - } - - return p; -} -#define sbrk tiny_sbrk -# endif /* ECOS */ - -# ifdef OS2 - -# include <stddef.h> - -# if !defined(__IBMC__) && !defined(__WATCOMC__) /* e.g. EMX */ - -struct exe_hdr { - unsigned short magic_number; - unsigned short padding[29]; - long new_exe_offset; -}; - -#define E_MAGIC(x) (x).magic_number -#define EMAGIC 0x5A4D -#define E_LFANEW(x) (x).new_exe_offset - -struct e32_exe { - unsigned char magic_number[2]; - unsigned char byte_order; - unsigned char word_order; - unsigned long exe_format_level; - unsigned short cpu; - unsigned short os; - unsigned long padding1[13]; - unsigned long object_table_offset; - unsigned long object_count; - unsigned long padding2[31]; -}; - -#define E32_MAGIC1(x) (x).magic_number[0] -#define E32MAGIC1 'L' -#define E32_MAGIC2(x) (x).magic_number[1] -#define E32MAGIC2 'X' -#define E32_BORDER(x) (x).byte_order -#define E32LEBO 0 -#define E32_WORDER(x) (x).word_order -#define E32LEWO 0 -#define E32_CPU(x) (x).cpu -#define E32CPU286 1 -#define E32_OBJTAB(x) (x).object_table_offset -#define E32_OBJCNT(x) (x).object_count - -struct o32_obj { - unsigned long size; - unsigned long base; - unsigned long flags; - unsigned long pagemap; - unsigned long mapsize; - unsigned long reserved; -}; - -#define O32_FLAGS(x) (x).flags -#define OBJREAD 0x0001L -#define OBJWRITE 0x0002L -#define OBJINVALID 0x0080L -#define O32_SIZE(x) (x).size -#define O32_BASE(x) (x).base - -# else /* IBM's compiler */ - -/* A kludge to get around what appears to be a header file bug */ -# ifndef WORD -# define WORD unsigned short -# endif -# ifndef DWORD -# define DWORD unsigned long -# endif - -# define EXE386 1 -# include <newexe.h> -# include <exe386.h> - -# endif /* __IBMC__ */ - -# define INCL_DOSEXCEPTIONS -# define INCL_DOSPROCESS -# define INCL_DOSERRORS -# define INCL_DOSMODULEMGR -# define INCL_DOSMEMMGR -# include <os2.h> - - -/* Disable and enable signals during nontrivial allocations */ - -void GC_disable_signals(void) -{ - ULONG nest; - - DosEnterMustComplete(&nest); - if (nest != 1) ABORT("nested GC_disable_signals"); -} - -void GC_enable_signals(void) -{ - ULONG nest; - - DosExitMustComplete(&nest); - if (nest != 0) ABORT("GC_enable_signals"); -} - - -# else - -# if !defined(PCR) && !defined(AMIGA) && !defined(MSWIN32) \ - && !defined(MACOS) && !defined(DJGPP) && !defined(DOS4GW) \ - && !defined(NO_SIGSET) - -# if defined(sigmask) && !defined(UTS4) - /* Use the traditional BSD interface */ -# define SIGSET_T int -# define SIG_DEL(set, signal) (set) &= ~(sigmask(signal)) -# define SIG_FILL(set) (set) = 0x7fffffff - /* Setting the leading bit appears to provoke a bug in some */ - /* longjmp implementations. Most systems appear not to have */ - /* a signal 32. */ -# define SIGSETMASK(old, new) (old) = sigsetmask(new) -# else - /* Use POSIX/SYSV interface */ -# define SIGSET_T sigset_t -# define SIG_DEL(set, signal) sigdelset(&(set), (signal)) -# define SIG_FILL(set) sigfillset(&set) -# define SIGSETMASK(old, new) sigprocmask(SIG_SETMASK, &(new), &(old)) -# endif - -static GC_bool mask_initialized = FALSE; - -static SIGSET_T new_mask; - -static SIGSET_T old_mask; - -static SIGSET_T dummy; - -#if defined(PRINTSTATS) && !defined(THREADS) -# define CHECK_SIGNALS - int GC_sig_disabled = 0; -#endif - -void GC_disable_signals() -{ - if (!mask_initialized) { - SIG_FILL(new_mask); - - SIG_DEL(new_mask, SIGSEGV); - SIG_DEL(new_mask, SIGILL); - SIG_DEL(new_mask, SIGQUIT); -# ifdef SIGBUS - SIG_DEL(new_mask, SIGBUS); -# endif -# ifdef SIGIOT - SIG_DEL(new_mask, SIGIOT); -# endif -# ifdef SIGEMT - SIG_DEL(new_mask, SIGEMT); -# endif -# ifdef SIGTRAP - SIG_DEL(new_mask, SIGTRAP); -# endif - mask_initialized = TRUE; - } -# ifdef CHECK_SIGNALS - if (GC_sig_disabled != 0) ABORT("Nested disables"); - GC_sig_disabled++; -# endif - SIGSETMASK(old_mask,new_mask); -} - -void GC_enable_signals() -{ -# ifdef CHECK_SIGNALS - if (GC_sig_disabled != 1) ABORT("Unmatched enable"); - GC_sig_disabled--; -# endif - SIGSETMASK(dummy,old_mask); -} - -# endif /* !PCR */ - -# endif /*!OS/2 */ - -/* Ivan Demakov: simplest way (to me) */ -#if defined (DOS4GW) || defined (NO_SIGSET) - void GC_disable_signals() { } - void GC_enable_signals() { } -#endif - -/* Find the page size */ -word GC_page_size; - -# ifdef MSWIN32 - void GC_setpagesize() - { - SYSTEM_INFO sysinfo; - - GetSystemInfo(&sysinfo); - GC_page_size = sysinfo.dwPageSize; - } - -# else -# if defined(MPROTECT_VDB) || defined(PROC_VDB) || defined(USE_MMAP) \ - || defined(USE_MUNMAP) - void GC_setpagesize() - { - GC_page_size = GETPAGESIZE(); - } -# else - /* It's acceptable to fake it. */ - void GC_setpagesize() - { - GC_page_size = HBLKSIZE; - } -# endif -# endif - -/* - * Find the base of the stack. - * Used only in single-threaded environment. - * With threads, GC_mark_roots needs to know how to do this. - * Called with allocator lock held. - */ -# ifdef MSWIN32 -# define is_writable(prot) ((prot) == PAGE_READWRITE \ - || (prot) == PAGE_WRITECOPY \ - || (prot) == PAGE_EXECUTE_READWRITE \ - || (prot) == PAGE_EXECUTE_WRITECOPY) -/* Return the number of bytes that are writable starting at p. */ -/* The pointer p is assumed to be page aligned. */ -/* If base is not 0, *base becomes the beginning of the */ -/* allocation region containing p. */ -word GC_get_writable_length(ptr_t p, ptr_t *base) -{ - MEMORY_BASIC_INFORMATION buf; - word result; - word protect; - - result = VirtualQuery(p, &buf, sizeof(buf)); - if (result != sizeof(buf)) ABORT("Weird VirtualQuery result"); - if (base != 0) *base = (ptr_t)(buf.AllocationBase); - protect = (buf.Protect & ~(PAGE_GUARD | PAGE_NOCACHE)); - if (!is_writable(protect)) { - return(0); - } - if (buf.State != MEM_COMMIT) return(0); - return(buf.RegionSize); -} - -ptr_t GC_get_stack_base() -{ - int dummy; - ptr_t sp = (ptr_t)(&dummy); - ptr_t trunc_sp = (ptr_t)((word)sp & ~(GC_page_size - 1)); - word size = GC_get_writable_length(trunc_sp, 0); - - return(trunc_sp + size); -} - - -# else - -# ifdef OS2 - -ptr_t GC_get_stack_base() -{ - PTIB ptib; - PPIB ppib; - - if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) { - GC_err_printf0("DosGetInfoBlocks failed\n"); - ABORT("DosGetInfoBlocks failed\n"); - } - return((ptr_t)(ptib -> tib_pstacklimit)); -} - -# else - -# ifdef AMIGA - -ptr_t GC_get_stack_base() -{ - struct Process *proc = (struct Process*)SysBase->ThisTask; - - /* Reference: Amiga Guru Book Pages: 42,567,574 */ - if (proc->pr_Task.tc_Node.ln_Type==NT_PROCESS - && proc->pr_CLI != NULL) { - /* first ULONG is StackSize */ - /*longPtr = proc->pr_ReturnAddr; - size = longPtr[0];*/ - - return (char *)proc->pr_ReturnAddr + sizeof(ULONG); - } else { - return (char *)proc->pr_Task.tc_SPUpper; - } -} - -#if 0 /* old version */ -ptr_t GC_get_stack_base() -{ - extern struct WBStartup *_WBenchMsg; - extern long __base; - extern long __stack; - struct Task *task; - struct Process *proc; - struct CommandLineInterface *cli; - long size; - - if ((task = FindTask(0)) == 0) { - GC_err_puts("Cannot find own task structure\n"); - ABORT("task missing"); - } - proc = (struct Process *)task; - cli = BADDR(proc->pr_CLI); - - if (_WBenchMsg != 0 || cli == 0) { - size = (char *)task->tc_SPUpper - (char *)task->tc_SPLower; - } else { - size = cli->cli_DefaultStack * 4; - } - return (ptr_t)(__base + GC_max(size, __stack)); -} -#endif /* 0 */ - -# else /* !AMIGA, !OS2, ... */ - -# 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; - - /*ARGSUSED*/ - void GC_fault_handler(sig) - int sig; - { - longjmp(GC_jmp_buf, 1); - } - -# ifdef __STDC__ - typedef void (*handler)(int); -# else - typedef void (*handler)(); -# endif - -# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1) - static struct sigaction old_segv_act; -# if defined(_sigargs) || defined(HPUX) /* !Irix6.x */ - static struct sigaction old_bus_act; -# endif -# else - static handler old_segv_handler, old_bus_handler; -# endif - - void GC_setup_temporary_fault_handler() - { -# ifndef ECOS -# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1) - struct sigaction act; - - act.sa_handler = GC_fault_handler; - 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. */ - - (void) sigemptyset(&act.sa_mask); -# ifdef 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); -# else - (void) sigaction(SIGSEGV, &act, &old_segv_act); -# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \ - || defined(HPUX) - /* 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 */ -# else - old_segv_handler = signal(SIGSEGV, GC_fault_handler); -# ifdef SIGBUS - old_bus_handler = signal(SIGBUS, GC_fault_handler); -# endif -# endif -# endif /* ECOS */ - } - - void GC_reset_fault_handler() - { -# ifndef ECOS -# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1) - (void) sigaction(SIGSEGV, &old_segv_act, 0); -# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \ - || defined(HPUX) - (void) sigaction(SIGBUS, &old_bus_act, 0); -# endif -# else - (void) signal(SIGSEGV, old_segv_handler); -# ifdef SIGBUS - (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). */ - 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 */ - /* static since it's only called once, with the */ - /* allocation lock held. */ - - - GC_setup_temporary_fault_handler(); - if (setjmp(GC_jmp_buf) == 0) { - result = (ptr_t)(((word)(p)) - & ~(MIN_PAGE_SIZE-1)); - for (;;) { - if (up) { - result += MIN_PAGE_SIZE; - } else { - result -= MIN_PAGE_SIZE; - } - GC_noop1((word)(*result)); - } - } - GC_reset_fault_handler(); - if (!up) { - result += MIN_PAGE_SIZE; - } - return(result); -# else /* ECOS */ - abort(); -# endif /* ECOS */ - } -# endif - -# ifndef ECOS - -#ifdef LINUX_STACKBOTTOM - -# define STAT_SKIP 27 /* Number of fields preceding startstack */ - /* field in /proc/<pid>/stat */ - - ptr_t GC_linux_stack_base(void) - { - char buf[50]; - FILE *f; - char c; - word result = 0; - int i; - - sprintf(buf, "/proc/%d/stat", getpid()); - f = fopen(buf, "r"); - if (NULL == f) ABORT("Couldn't open /proc/<pid>/stat"); - c = getc(f); - /* Skip the required number of fields. This number is hopefully */ - /* constant across all Linux implementations. */ - for (i = 0; i < STAT_SKIP; ++i) { - while (isspace(c)) c = getc(f); - while (!isspace(c)) c = getc(f); - } - while (isspace(c)) c = getc(f); - while (isdigit(c)) { - result *= 10; - result += c - '0'; - c = getc(f); - } - if (result < 0x10000000) ABORT("Absurd stack bottom value"); - return (ptr_t)result; - } - -#endif /* LINUX_STACKBOTTOM */ - -ptr_t GC_get_stack_base() -{ - word dummy; - ptr_t result; - -# define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1) - -# if defined(STACKBASE) - extern ptr_t STACKBASE; - return(STACKBASE); -# else -# ifdef STACKBOTTOM - return(STACKBOTTOM); -# else -# ifdef HEURISTIC1 -# ifdef STACK_GROWS_DOWN - result = (ptr_t)((((word)(&dummy)) - + STACKBOTTOM_ALIGNMENT_M1) - & ~STACKBOTTOM_ALIGNMENT_M1); -# else - result = (ptr_t)(((word)(&dummy)) - & ~STACKBOTTOM_ALIGNMENT_M1); -# endif -# endif /* HEURISTIC1 */ -# ifdef LINUX_STACKBOTTOM - result = GC_linux_stack_base(); -# endif -# ifdef HEURISTIC2 -# ifdef STACK_GROWS_DOWN - result = GC_find_limit((ptr_t)(&dummy), TRUE); -# ifdef HEURISTIC2_LIMIT - if (result > HEURISTIC2_LIMIT - && (ptr_t)(&dummy) < HEURISTIC2_LIMIT) { - result = HEURISTIC2_LIMIT; - } -# endif -# else - result = GC_find_limit((ptr_t)(&dummy), FALSE); -# ifdef HEURISTIC2_LIMIT - if (result < HEURISTIC2_LIMIT - && (ptr_t)(&dummy) > HEURISTIC2_LIMIT) { - result = HEURISTIC2_LIMIT; - } -# endif -# endif - -# endif /* HEURISTIC2 */ -# ifdef STACK_GROWS_DOWN - if (result == 0) result = (ptr_t)(signed_word)(-sizeof(ptr_t)); -# endif - return(result); -# endif /* STACKBOTTOM */ -# endif /* STACKBASE */ -} -# endif /* ECOS */ - -# endif /* ! AMIGA */ -# endif /* ! OS2 */ -# endif /* ! MSWIN32 */ - -/* - * Register static data segment(s) as roots. - * If more data segments are added later then they need to be registered - * add that point (as we do with SunOS dynamic loading), - * or GC_mark_roots needs to check for them (as we do with PCR). - * Called with allocator lock held. - */ - -# ifdef OS2 - -void GC_register_data_segments() -{ - PTIB ptib; - PPIB ppib; - HMODULE module_handle; -# define PBUFSIZ 512 - UCHAR path[PBUFSIZ]; - FILE * myexefile; - struct exe_hdr hdrdos; /* MSDOS header. */ - struct e32_exe hdr386; /* Real header for my executable */ - struct o32_obj seg; /* Currrent segment */ - int nsegs; - - - if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) { - GC_err_printf0("DosGetInfoBlocks failed\n"); - ABORT("DosGetInfoBlocks failed\n"); - } - module_handle = ppib -> pib_hmte; - if (DosQueryModuleName(module_handle, PBUFSIZ, path) != NO_ERROR) { - GC_err_printf0("DosQueryModuleName failed\n"); - ABORT("DosGetInfoBlocks failed\n"); - } - myexefile = fopen(path, "rb"); - if (myexefile == 0) { - GC_err_puts("Couldn't open executable "); - GC_err_puts(path); GC_err_puts("\n"); - ABORT("Failed to open executable\n"); - } - if (fread((char *)(&hdrdos), 1, sizeof hdrdos, myexefile) < sizeof hdrdos) { - GC_err_puts("Couldn't read MSDOS header from "); - GC_err_puts(path); GC_err_puts("\n"); - ABORT("Couldn't read MSDOS header"); - } - if (E_MAGIC(hdrdos) != EMAGIC) { - GC_err_puts("Executable has wrong DOS magic number: "); - GC_err_puts(path); GC_err_puts("\n"); - ABORT("Bad DOS magic number"); - } - if (fseek(myexefile, E_LFANEW(hdrdos), SEEK_SET) != 0) { - GC_err_puts("Seek to new header failed in "); - GC_err_puts(path); GC_err_puts("\n"); - ABORT("Bad DOS magic number"); - } - if (fread((char *)(&hdr386), 1, sizeof hdr386, myexefile) < sizeof hdr386) { - GC_err_puts("Couldn't read MSDOS header from "); - GC_err_puts(path); GC_err_puts("\n"); - ABORT("Couldn't read OS/2 header"); - } - if (E32_MAGIC1(hdr386) != E32MAGIC1 || E32_MAGIC2(hdr386) != E32MAGIC2) { - GC_err_puts("Executable has wrong OS/2 magic number:"); - GC_err_puts(path); GC_err_puts("\n"); - ABORT("Bad OS/2 magic number"); - } - if ( E32_BORDER(hdr386) != E32LEBO || E32_WORDER(hdr386) != E32LEWO) { - GC_err_puts("Executable %s has wrong byte order: "); - GC_err_puts(path); GC_err_puts("\n"); - ABORT("Bad byte order"); - } - if ( E32_CPU(hdr386) == E32CPU286) { - GC_err_puts("GC can't handle 80286 executables: "); - GC_err_puts(path); GC_err_puts("\n"); - EXIT(); - } - if (fseek(myexefile, E_LFANEW(hdrdos) + E32_OBJTAB(hdr386), - SEEK_SET) != 0) { - GC_err_puts("Seek to object table failed: "); - GC_err_puts(path); GC_err_puts("\n"); - ABORT("Seek to object table failed"); - } - for (nsegs = E32_OBJCNT(hdr386); nsegs > 0; nsegs--) { - int flags; - if (fread((char *)(&seg), 1, sizeof seg, myexefile) < sizeof seg) { - GC_err_puts("Couldn't read obj table entry from "); - GC_err_puts(path); GC_err_puts("\n"); - ABORT("Couldn't read obj table entry"); - } - flags = O32_FLAGS(seg); - if (!(flags & OBJWRITE)) continue; - if (!(flags & OBJREAD)) continue; - if (flags & OBJINVALID) { - GC_err_printf0("Object with invalid pages?\n"); - continue; - } - GC_add_roots_inner(O32_BASE(seg), O32_BASE(seg)+O32_SIZE(seg), FALSE); - } -} - -# else - -# ifdef MSWIN32 - /* 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 */ - /* 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); - } - - void GC_init_win32() - { - GC_win32s = GC_is_win32s(); - } - - /* Return the smallest address a such that VirtualQuery */ - /* returns correct results for all addresses between a and start. */ - /* Assumes VirtualQuery returns correct information for start. */ - ptr_t GC_least_described_address(ptr_t start) - { - MEMORY_BASIC_INFORMATION buf; - SYSTEM_INFO sysinfo; - DWORD result; - LPVOID limit; - ptr_t p; - LPVOID q; - - GetSystemInfo(&sysinfo); - limit = sysinfo.lpMinimumApplicationAddress; - p = (ptr_t)((word)start & ~(GC_page_size - 1)); - for (;;) { - q = (LPVOID)(p - GC_page_size); - if ((ptr_t)q > (ptr_t)p /* underflow */ || q < limit) break; - result = VirtualQuery(q, &buf, sizeof(buf)); - if (result != sizeof(buf) || buf.AllocationBase == 0) break; - p = (ptr_t)(buf.AllocationBase); - } - return(p); - } - - /* 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; - -# ifndef REDIRECT_MALLOC - static ptr_t malloc_heap_pointer = 0; - - if (0 == malloc_heap_pointer) { - MEMORY_BASIC_INFORMATION buf; - register DWORD result = VirtualQuery(malloc(1), &buf, sizeof(buf)); - - if (result != sizeof(buf)) { - ABORT("Weird VirtualQuery result"); - } - malloc_heap_pointer = (ptr_t)(buf.AllocationBase); - } - if (p == malloc_heap_pointer) return(TRUE); -# endif - for (i = 0; i < GC_n_heap_bases; i++) { - if (GC_heap_bases[i] == p) return(TRUE); - } - return(FALSE); - } - - void GC_register_root_section(ptr_t static_root) - { - MEMORY_BASIC_INFORMATION buf; - SYSTEM_INFO sysinfo; - DWORD result; - DWORD protect; - LPVOID p; - char * base; - char * limit, * new_limit; - - if (!GC_win32s) return; - p = base = limit = GC_least_described_address(static_root); - GetSystemInfo(&sysinfo); - while (p < sysinfo.lpMaximumApplicationAddress) { - result = VirtualQuery(p, &buf, sizeof(buf)); - if (result != sizeof(buf) || buf.AllocationBase == 0 - || GC_is_heap_base(buf.AllocationBase)) break; - new_limit = (char *)p + buf.RegionSize; - protect = buf.Protect; - if (buf.State == MEM_COMMIT - && is_writable(protect)) { - if ((char *)p == limit) { - limit = new_limit; - } else { - if (base != limit) GC_add_roots_inner(base, limit, FALSE); - base = p; - limit = new_limit; - } - } - if (p > (LPVOID)new_limit /* overflow */) break; - p = (LPVOID)new_limit; - } - if (base != limit) GC_add_roots_inner(base, limit, FALSE); - } - - void GC_register_data_segments() - { - static char dummy; - - GC_register_root_section((ptr_t)(&dummy)); - } -# else -# ifdef AMIGA - - void GC_register_data_segments() - { - struct Process *proc; - struct CommandLineInterface *cli; - BPTR myseglist; - ULONG *data; - - int num; - - -# ifdef __GNUC__ - ULONG dataSegSize; - GC_bool found_segment = FALSE; - extern char __data_size[]; - - dataSegSize=__data_size+8; - /* Can`t find the Location of __data_size, because - it`s possible that is it, inside the segment. */ - -# endif - - proc= (struct Process*)SysBase->ThisTask; - - /* Reference: Amiga Guru Book Pages: 538ff,565,573 - and XOper.asm */ - if (proc->pr_Task.tc_Node.ln_Type==NT_PROCESS) { - if (proc->pr_CLI == NULL) { - myseglist = proc->pr_SegList; - } else { - /* ProcLoaded 'Loaded as a command: '*/ - cli = BADDR(proc->pr_CLI); - myseglist = cli->cli_Module; - } - } else { - ABORT("Not a Process."); - } - - if (myseglist == NULL) { - ABORT("Arrrgh.. can't find segments, aborting"); - } - - /* xoper hunks Shell Process */ - - num=0; - for (data = (ULONG *)BADDR(myseglist); data != NULL; - data = (ULONG *)BADDR(data[0])) { - if (((ULONG) GC_register_data_segments < (ULONG) &data[1]) || - ((ULONG) GC_register_data_segments > (ULONG) &data[1] + data[-1])) { -# ifdef __GNUC__ - if (dataSegSize == data[-1]) { - found_segment = TRUE; - } -# endif - GC_add_roots_inner((char *)&data[1], - ((char *)&data[1]) + data[-1], FALSE); - } - ++num; - } /* for */ -# ifdef __GNUC__ - if (!found_segment) { - ABORT("Can`t find correct Segments.\nSolution: Use an newer version of ixemul.library"); - } -# endif - } - -#if 0 /* old version */ - void GC_register_data_segments() - { - extern struct WBStartup *_WBenchMsg; - struct Process *proc; - struct CommandLineInterface *cli; - BPTR myseglist; - ULONG *data; - - if ( _WBenchMsg != 0 ) { - if ((myseglist = _WBenchMsg->sm_Segment) == 0) { - GC_err_puts("No seglist from workbench\n"); - return; - } - } else { - if ((proc = (struct Process *)FindTask(0)) == 0) { - GC_err_puts("Cannot find process structure\n"); - return; - } - if ((cli = BADDR(proc->pr_CLI)) == 0) { - GC_err_puts("No CLI\n"); - return; - } - if ((myseglist = cli->cli_Module) == 0) { - GC_err_puts("No seglist from CLI\n"); - return; - } - } - - for (data = (ULONG *)BADDR(myseglist); data != 0; - data = (ULONG *)BADDR(data[0])) { -# ifdef AMIGA_SKIP_SEG - if (((ULONG) GC_register_data_segments < (ULONG) &data[1]) || - ((ULONG) GC_register_data_segments > (ULONG) &data[1] + data[-1])) { -# else - { -# endif /* AMIGA_SKIP_SEG */ - GC_add_roots_inner((char *)&data[1], - ((char *)&data[1]) + data[-1], FALSE); - } - } - } -#endif /* old version */ - - -# else - -# if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR) -char * GC_SysVGetDataStart(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 */ - word next_page = ((text_end + (word)max_page_size - 1) - & ~((word)max_page_size - 1)); - word page_offset = (text_end & ((word)max_page_size - 1)); - VOLATILE char * result = (char *)(next_page + page_offset); - /* Note that this isnt equivalent to just adding */ - /* max_page_size to &etext if &etext is at a page boundary */ - - GC_setup_temporary_fault_handler(); - if (setjmp(GC_jmp_buf) == 0) { - /* Try writing to the address. */ - *result = *result; - GC_reset_fault_handler(); - } else { - GC_reset_fault_handler(); - /* We got here via a longjmp. The address is not readable. */ - /* This is known to happen under Solaris 2.4 + gcc, which place */ - /* 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); - } - return((char *)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) - /* 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 */ - /* we don't lose some malloc allocated data structures */ - /* hanging from it. We're on thin ice here ... */ - extern caddr_t sbrk(); - - GC_add_roots_inner(DATASTART, (char *)sbrk(0), FALSE); -# else - GC_add_roots_inner(DATASTART, (char *)(DATAEND), FALSE); -# 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) - extern void* GC_MacGetDataStart(void); - /* globals begin above stack and end at a5. */ - GC_add_roots_inner((ptr_t)GC_MacGetDataStart(), - (ptr_t)LMGetCurrentA5(), FALSE); -# else -# if defined(__MWERKS__) -# if !__POWERPC__ - extern void* GC_MacGetDataStart(void); - /* MATTHEW: Function to handle Far Globals (CW Pro 3) */ -# if __option(far_data) - extern void* GC_MacGetDataEnd(void); -# endif - /* globals begin above stack and end at a5. */ - GC_add_roots_inner((ptr_t)GC_MacGetDataStart(), - (ptr_t)LMGetCurrentA5(), FALSE); - /* MATTHEW: Handle Far Globals */ -# if __option(far_data) - /* Far globals follow he QD globals: */ - GC_add_roots_inner((ptr_t)LMGetCurrentA5(), - (ptr_t)GC_MacGetDataEnd(), FALSE); -# endif -# else - extern char __data_start__[], __data_end__[]; - GC_add_roots_inner((ptr_t)&__data_start__, - (ptr_t)&__data_end__, FALSE); -# endif /* __POWERPC__ */ -# endif /* __MWERKS__ */ -# endif /* !THINK_C */ - } -# endif /* MACOS */ - - /* Dynamic libraries are added at every collection, since they may */ - /* change. */ -} - -# endif /* ! AMIGA */ -# endif /* ! MSWIN32 */ -# endif /* ! OS2 */ - -/* - * Auxiliary routines for obtaining memory from OS. - */ - -# if !defined(OS2) && !defined(PCR) && !defined(AMIGA) \ - && !defined(MSWIN32) && !defined(MACOS) && !defined(DOS4GW) - -# ifdef SUNOS4 - extern caddr_t sbrk(); -# endif -# ifdef __STDC__ -# define SBRK_ARG_T ptrdiff_t -# else -# define SBRK_ARG_T int -# endif - -# ifdef RS6000 -/* 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. */ -ptr_t GC_unix_get_mem(bytes) -word bytes; -{ - caddr_t cur_brk = (caddr_t)sbrk(0); - caddr_t result; - SBRK_ARG_T lsbs = (word)cur_brk & (GC_page_size-1); - static caddr_t my_brk_val = 0; - - if ((SBRK_ARG_T)bytes < 0) return(0); /* too big */ - if (lsbs != 0) { - if((caddr_t)(sbrk(GC_page_size - lsbs)) == (caddr_t)(-1)) return(0); - } - if (cur_brk == my_brk_val) { - /* Use the extra block we allocated last time. */ - result = (ptr_t)sbrk((SBRK_ARG_T)bytes); - if (result == (caddr_t)(-1)) return(0); - result -= GC_page_size; - } else { - result = (ptr_t)sbrk(GC_page_size + (SBRK_ARG_T)bytes); - if (result == (caddr_t)(-1)) return(0); - } - my_brk_val = result + bytes + GC_page_size; /* Always page aligned */ - return((ptr_t)result); -} - -#else /* Not RS6000 */ - -#if defined(USE_MMAP) -/* Tested only under IRIX5 and Solaris 2 */ - -#ifdef USE_MMAP_FIXED -# define GC_MMAP_FLAGS MAP_FIXED | MAP_PRIVATE - /* Seems to yield better performance on Solaris 2, but can */ - /* be unreliable if something is already mapped at the address. */ -#else -# define GC_MMAP_FLAGS MAP_PRIVATE -#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; - } - 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 */); - 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)); - return((ptr_t)result); -} - -#else /* Not RS6000, not USE_MMAP */ -ptr_t GC_unix_get_mem(bytes) -word bytes; -{ - ptr_t result; -# ifdef IRIX5 - /* Bare sbrk isn't thread safe. Play by malloc rules. */ - /* The equivalent may be needed on other systems as well. */ - __LOCK_MALLOC(); -# endif - { - ptr_t cur_brk = (ptr_t)sbrk(0); - SBRK_ARG_T lsbs = (word)cur_brk & (GC_page_size-1); - - if ((SBRK_ARG_T)bytes < 0) return(0); /* too big */ - if (lsbs != 0) { - if((ptr_t)sbrk(GC_page_size - lsbs) == (ptr_t)(-1)) return(0); - } - result = (ptr_t)sbrk((SBRK_ARG_T)bytes); - if (result == (ptr_t)(-1)) result = 0; - } -# ifdef IRIX5 - __UNLOCK_MALLOC(); -# endif - return(result); -} - -#endif /* Not USE_MMAP */ -#endif /* Not RS6000 */ - -# endif /* UN*X */ - -# ifdef OS2 - -void * os2_alloc(size_t bytes) -{ - void * result; - - if (DosAllocMem(&result, bytes, PAG_EXECUTE | PAG_READ | - PAG_WRITE | PAG_COMMIT) - != NO_ERROR) { - return(0); - } - if (result == 0) return(os2_alloc(bytes)); - return(result); -} - -# endif /* OS2 */ - - -# ifdef MSWIN32 -word GC_n_heap_bases = 0; - -ptr_t GC_win32_get_mem(bytes) -word bytes; -{ - ptr_t result; - - if (GC_win32s) { - /* 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, - MEM_COMMIT | MEM_RESERVE, - PAGE_EXECUTE_READWRITE); - } - if (HBLKDISPL(result) != 0) ABORT("Bad VirtualAlloc result"); - /* If I read the documentation correctly, this can */ - /* only happen if HBLKSIZE > 64k or not a power of 2. */ - if (GC_n_heap_bases >= MAX_HEAP_SECTS) ABORT("Too many heap sections"); - GC_heap_bases[GC_n_heap_bases++] = result; - return(result); -} - -void GC_win32_free_heap () -{ - if (GC_win32s) { - while (GC_n_heap_bases > 0) { - GlobalFree (GC_heap_bases[--GC_n_heap_bases]); - GC_heap_bases[GC_n_heap_bases] = 0; - } - } -} - - -# endif - -#ifdef USE_MUNMAP - -/* For now, this only works on some Unix-like systems. If you */ -/* have something else, don't define USE_MUNMAP. */ -/* We assume ANSI C to support this feature. */ -#include <unistd.h> -#include <sys/mman.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <fcntl.h> - -/* Compute a page aligned starting address for the unmap */ -/* operation on a block of size bytes starting at start. */ -/* Return 0 if the block is too small to make this feasible. */ -ptr_t GC_unmap_start(ptr_t start, word bytes) -{ - ptr_t result = start; - /* Round start to next page boundary. */ - result += GC_page_size - 1; - result = (ptr_t)((word)result & ~(GC_page_size - 1)); - if (result + GC_page_size > start + bytes) return 0; - return result; -} - -/* Compute end address for an unmap operation on the indicated */ -/* block. */ -ptr_t GC_unmap_end(ptr_t start, word bytes) -{ - ptr_t end_addr = start + bytes; - end_addr = (ptr_t)((word)end_addr & ~(GC_page_size - 1)); - return end_addr; -} - -/* We assume that GC_remap is called on exactly the same range */ -/* as a previous call to GC_unmap. It is safe to consistently */ -/* round the endpoints in both places. */ -void GC_unmap(ptr_t start, word bytes) -{ - ptr_t start_addr = GC_unmap_start(start, bytes); - ptr_t end_addr = GC_unmap_end(start, bytes); - word len = end_addr - start_addr; - if (0 == start_addr) return; - if (munmap(start_addr, len) != 0) ABORT("munmap failed"); - GC_unmapped_bytes += len; -} - - -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 (-1 == zero_descr) zero_descr = open("/dev/zero", O_RDWR); - 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"); - } - GC_unmapped_bytes -= len; -} - -/* Two adjacent blocks have already been unmapped and are about to */ -/* be merged. Unmap the whole block. This typically requires */ -/* that we unmap a small section in the middle that was not previously */ -/* unmapped due to alignment constraints. */ -void GC_unmap_gap(ptr_t start1, word bytes1, ptr_t start2, word bytes2) -{ - ptr_t start1_addr = GC_unmap_start(start1, bytes1); - ptr_t end1_addr = GC_unmap_end(start1, bytes1); - ptr_t start2_addr = GC_unmap_start(start2, bytes2); - ptr_t end2_addr = GC_unmap_end(start2, bytes2); - ptr_t start_addr = end1_addr; - ptr_t end_addr = start2_addr; - word len; - GC_ASSERT(start1 + bytes1 == start2); - if (0 == start1_addr) start_addr = GC_unmap_start(start1, bytes1 + bytes2); - if (0 == start2_addr) end_addr = GC_unmap_end(start1, bytes1 + bytes2); - if (0 == start_addr) return; - len = end_addr - start_addr; - if (len != 0 && munmap(start_addr, len) != 0) ABORT("munmap failed"); - GC_unmapped_bytes += len; -} - -#endif /* USE_MUNMAP */ - -/* Routine for pushing any additional roots. In THREADS */ -/* environment, this is also responsible for marking from */ -/* thread stacks. In the SRC_M3 case, it also handles */ -/* global variables. */ -#ifndef THREADS -void (*GC_push_other_roots)() = 0; -#else /* THREADS */ - -# ifdef PCR -PCR_ERes GC_push_thread_stack(PCR_Th_T *t, PCR_Any dummy) -{ - struct PCR_ThCtl_TInfoRep info; - PCR_ERes result; - - info.ti_stkLow = info.ti_stkHi = 0; - result = PCR_ThCtl_GetInfo(t, &info); - GC_push_all_stack((ptr_t)(info.ti_stkLow), (ptr_t)(info.ti_stkHi)); - return(result); -} - -/* Push the contents of an old object. We treat this as stack */ -/* data only becasue that makes it robust against mark stack */ -/* overflow. */ -PCR_ERes GC_push_old_obj(void *p, size_t size, PCR_Any data) -{ - GC_push_all_stack((ptr_t)p, (ptr_t)p + size); - return(PCR_ERes_okay); -} - - -void GC_default_push_other_roots() -{ - /* Traverse data allocated by previous memory managers. */ - { - extern struct PCR_MM_ProcsRep * GC_old_allocator; - - if ((*(GC_old_allocator->mmp_enumerate))(PCR_Bool_false, - GC_push_old_obj, 0) - != PCR_ERes_okay) { - ABORT("Old object enumeration failed"); - } - } - /* Traverse all thread stacks. */ - if (PCR_ERes_IsErr( - PCR_ThCtl_ApplyToAllOtherThreads(GC_push_thread_stack,0)) - || PCR_ERes_IsErr(GC_push_thread_stack(PCR_Th_CurrThread(), 0))) { - ABORT("Thread stack marking failed\n"); - } -} - -# endif /* PCR */ - -# ifdef SRC_M3 - -# ifdef ALL_INTERIOR_POINTERS - --> misconfigured -# endif - - -extern void ThreadF__ProcessStacks(); - -void GC_push_thread_stack(start, stop) -word start, stop; -{ - GC_push_all_stack((ptr_t)start, (ptr_t)stop + sizeof(word)); -} - -/* Push routine with M3 specific calling convention. */ -GC_m3_push_root(dummy1, p, dummy2, dummy3) -word *p; -ptr_t dummy1, dummy2; -int dummy3; -{ - word q = *p; - - if ((ptr_t)(q) >= GC_least_plausible_heap_addr - && (ptr_t)(q) < GC_greatest_plausible_heap_addr) { - GC_push_one_checked(q,FALSE); - } -} - -/* M3 set equivalent to RTHeap.TracedRefTypes */ -typedef struct { int elts[1]; } RefTypeSet; -RefTypeSet GC_TracedRefTypes = {{0x1}}; - -/* From finalize.c */ -extern void GC_push_finalizer_structures(); - -/* From stubborn.c: */ -# ifdef STUBBORN_ALLOC - extern GC_PTR * GC_changing_list_start; -# endif - - -void GC_default_push_other_roots() -{ - /* Use the M3 provided routine for finding static roots. */ - /* This is a bit dubious, since it presumes no C roots. */ - /* We handle the collector roots explicitly. */ - { -# ifdef STUBBORN_ALLOC - GC_push_one(GC_changing_list_start); -# endif - GC_push_finalizer_structures(); - RTMain__GlobalMapProc(GC_m3_push_root, 0, GC_TracedRefTypes); - } - if (GC_words_allocd > 0) { - ThreadF__ProcessStacks(GC_push_thread_stack); - } - /* Otherwise this isn't absolutely necessary, and we have */ - /* startup ordering problems. */ -} - -# endif /* SRC_M3 */ - -# if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \ - || defined(IRIX_THREADS) || defined(LINUX_THREADS) \ - || defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS) - -extern void GC_push_all_stacks(); - -void GC_default_push_other_roots() -{ - GC_push_all_stacks(); -} - -# endif /* SOLARIS_THREADS || ... */ - -void (*GC_push_other_roots)() = GC_default_push_other_roots; - -#endif - -/* - * Routines for accessing dirty bits on virtual pages. - * We plan to eventaually implement four strategies for doing so: - * DEFAULT_VDB: A simple dummy implementation that treats every page - * as possibly dirty. This makes incremental collection - * useless, but the implementation is still correct. - * PCR_VDB: Use PPCRs virtual dirty bit facility. - * PROC_VDB: Use the /proc facility for reading dirty bits. Only - * works under some SVR4 variants. Even then, it may be - * too slow to be entirely satisfactory. Requires reading - * dirty bits for entire address space. Implementations tend - * to assume that the client is a (slow) debugger. - * MPROTECT_VDB:Protect pages and then catch the faults to keep track of - * dirtied pages. The implementation (and implementability) - * is highly system dependent. This usually fails when system - * calls write to a protected page. We prevent the read system - * call from doing so. It is the clients responsibility to - * make sure that other system calls are similarly protected - * or write only to the stack. - */ - -GC_bool GC_dirty_maintained = FALSE; - -# ifdef DEFAULT_VDB - -/* All of the following assume the allocation lock is held, and */ -/* signals are disabled. */ - -/* The client asserts that unallocated pages in the heap are never */ -/* written. */ - -/* Initialize virtual dirty bit implementation. */ -void GC_dirty_init() -{ - GC_dirty_maintained = TRUE; -} - -/* Retrieve system dirty bits for heap to a local buffer. */ -/* Restore the systems notion of which pages are dirty. */ -void GC_read_dirty() -{} - -/* Is the HBLKSIZE sized page at h marked dirty in the local buffer? */ -/* If the actual page size is different, this returns TRUE if any */ -/* of the pages overlapping h are dirty. This routine may err on the */ -/* side of labelling pages as dirty (and this implementation does). */ -/*ARGSUSED*/ -GC_bool GC_page_was_dirty(h) -struct hblk *h; -{ - return(TRUE); -} - -/* - * The following two routines are typically less crucial. They matter - * most with large dynamic libraries, or if we can't accurately identify - * stacks, e.g. under Solaris 2.X. Otherwise the following default - * versions are adequate. - */ - -/* Could any valid GC heap pointer ever have been written to this page? */ -/*ARGSUSED*/ -GC_bool GC_page_was_ever_dirty(h) -struct hblk *h; -{ - return(TRUE); -} - -/* Reset the n pages starting at h to "was never dirty" status. */ -void GC_is_fresh(h, n) -struct hblk *h; -word n; -{ -} - -/* A call hints that h is about to be written. */ -/* May speed up some dirty bit implementations. */ -/*ARGSUSED*/ -void GC_write_hint(h) -struct hblk *h; -{ -} - -# endif /* DEFAULT_VDB */ - - -# ifdef MPROTECT_VDB - -/* - * See DEFAULT_VDB for interface descriptions. - */ - -/* - * 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. - * 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. - */ - -# ifndef MSWIN32 - -# include <sys/mman.h> -# include <signal.h> -# include <sys/syscall.h> - -# define PROTECT(addr, len) \ - if (mprotect((caddr_t)(addr), (size_t)(len), \ - PROT_READ | OPT_PROT_EXEC) < 0) { \ - ABORT("mprotect failed"); \ - } -# define UNPROTECT(addr, len) \ - if (mprotect((caddr_t)(addr), (size_t)(len), \ - PROT_WRITE | PROT_READ | OPT_PROT_EXEC ) < 0) { \ - ABORT("un-mprotect failed"); \ - } - -# else - -# include <signal.h> - - static DWORD protect_junk; -# define PROTECT(addr, len) \ - if (!VirtualProtect((addr), (len), PAGE_EXECUTE_READ, \ - &protect_junk)) { \ - DWORD last_error = GetLastError(); \ - GC_printf1("Last error code: %lx\n", last_error); \ - ABORT("VirtualProtect failed"); \ - } -# define UNPROTECT(addr, len) \ - if (!VirtualProtect((addr), (len), PAGE_EXECUTE_READWRITE, \ - &protect_junk)) { \ - ABORT("un-VirtualProtect failed"); \ - } - -# endif - -#if defined(SUNOS4) || defined(FREEBSD) - typedef void (* SIG_PF)(); -#endif -#if defined(SUNOS5SIGS) || defined(OSF1) || defined(LINUX) -# ifdef __STDC__ - typedef void (* SIG_PF)(int); -# else - typedef void (* SIG_PF)(); -# endif -#endif -#if defined(MSWIN32) - typedef LPTOP_LEVEL_EXCEPTION_FILTER SIG_PF; -# undef SIG_DFL -# define SIG_DFL (LPTOP_LEVEL_EXCEPTION_FILTER) (-1) -#endif - -#if defined(IRIX5) || defined(OSF1) - typedef void (* REAL_SIG_PF)(int, int, struct sigcontext *); -#endif -#if defined(SUNOS5SIGS) -# ifdef HPUX -# define SIGINFO __siginfo -# else -# define SIGINFO siginfo -# endif -# ifdef __STDC__ - typedef void (* REAL_SIG_PF)(int, struct SIGINFO *, void *); -# else - typedef void (* REAL_SIG_PF)(); -# endif -#endif -#if defined(LINUX) -# include <linux/version.h> -# if (LINUX_VERSION_CODE >= 0x20100) && !defined(M68K) || defined(ALPHA) || defined(IA64) - typedef struct sigcontext s_c; -# else - typedef struct sigcontext_struct s_c; -# endif -# if defined(ALPHA) || defined(M68K) - typedef void (* REAL_SIG_PF)(int, int, s_c *); -# else -# if defined(IA64) - typedef void (* REAL_SIG_PF)(int, siginfo_t *, s_c *); -# else - typedef void (* REAL_SIG_PF)(int, s_c); -# endif -# endif -# ifdef ALPHA - /* Retrieve fault address from sigcontext structure by decoding */ - /* instruction. */ - char * get_fault_addr(s_c *sc) { - unsigned instr; - word faultaddr; - - instr = *((unsigned *)(sc->sc_pc)); - faultaddr = sc->sc_regs[(instr >> 16) & 0x1f]; - faultaddr += (word) (((int)instr << 16) >> 16); - return (char *)faultaddr; - } -# endif /* !ALPHA */ -# endif - -SIG_PF GC_old_bus_handler; -SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */ - -/*ARGSUSED*/ -# if defined (SUNOS4) || defined(FREEBSD) - void GC_write_fault_handler(sig, code, scp, addr) - int sig, code; - struct sigcontext *scp; - char * addr; -# ifdef SUNOS4 -# define SIG_OK (sig == SIGSEGV || sig == SIGBUS) -# define CODE_OK (FC_CODE(code) == FC_PROT \ - || (FC_CODE(code) == FC_OBJERR \ - && FC_ERRNO(code) == FC_PROT)) -# endif -# ifdef FREEBSD -# define SIG_OK (sig == SIGBUS) -# define CODE_OK (code == BUS_PAGE_FAULT) -# endif -# endif -# if defined(IRIX5) || defined(OSF1) -# include <errno.h> - void GC_write_fault_handler(int sig, int code, struct sigcontext *scp) -# define SIG_OK (sig == SIGSEGV) -# ifdef OSF1 -# define CODE_OK (code == 2 /* experimentally determined */) -# endif -# ifdef IRIX5 -# define CODE_OK (code == EACCES) -# endif -# endif -# if defined(LINUX) -# if defined(ALPHA) || defined(M68K) - void GC_write_fault_handler(int sig, int code, s_c * sc) -# else -# if defined(IA64) - void GC_write_fault_handler(int sig, siginfo_t * si, s_c * scp) -# else - void GC_write_fault_handler(int sig, s_c sc) -# endif -# endif -# define SIG_OK (sig == SIGSEGV) -# define CODE_OK TRUE - /* Empirically c.trapno == 14, on IA32, but is that useful? */ - /* Should probably consider alignment issues on other */ - /* architectures. */ -# endif -# if defined(SUNOS5SIGS) -# ifdef __STDC__ - void GC_write_fault_handler(int sig, struct SIGINFO *scp, void * context) -# else - void GC_write_fault_handler(sig, scp, context) - int sig; - struct SIGINFO *scp; - void * context; -# endif -# ifdef HPUX -# define SIG_OK (sig == SIGSEGV || sig == SIGBUS) -# define CODE_OK (scp -> si_code == SEGV_ACCERR) \ - || (scp -> si_code == BUS_ADRERR) \ - || (scp -> si_code == BUS_UNKNOWN) \ - || (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(MSWIN32) - LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info) -# define SIG_OK (exc_info -> ExceptionRecord -> ExceptionCode == \ - EXCEPTION_ACCESS_VIOLATION) -# define CODE_OK (exc_info -> ExceptionRecord -> ExceptionInformation[0] == 1) - /* Write fault */ -# endif -{ - register unsigned i; -# ifdef IRIX5 - char * addr = (char *) (size_t) (scp -> sc_badvaddr); -# endif -# if defined(OSF1) && defined(ALPHA) - char * addr = (char *) (scp -> sc_traparg_a0); -# endif -# ifdef SUNOS5SIGS - char * addr = (char *) (scp -> si_addr); -# endif -# ifdef LINUX -# ifdef I386 - char * addr = (char *) (sc.cr2); -# else -# if defined(M68K) - char * addr = NULL; - - struct sigcontext *scp = (struct sigcontext *)(&sc); - - int format = (scp->sc_formatvec >> 12) & 0xf; - unsigned long *framedata = (unsigned long *)(scp + 1); - unsigned long ea; - - if (format == 0xa || format == 0xb) { - /* 68020/030 */ - ea = framedata[2]; - } else if (format == 7) { - /* 68040 */ - ea = framedata[3]; - } else if (format == 4) { - /* 68060 */ - ea = framedata[0]; - if (framedata[1] & 0x08000000) { - /* correct addr on misaligned access */ - ea = (ea+4095)&(~4095); - } - } - addr = (char *)ea; -# else -# ifdef ALPHA - char * addr = get_fault_addr(sc); -# else -# ifdef IA64 - char * addr = si -> si_addr; -# else -# if defined(POWERPC) - char * addr = (char *) (sc.regs->dar); -# else - --> architecture not supported -# endif -# endif -# endif -# endif -# endif -# endif -# if defined(MSWIN32) - char * addr = (char *) (exc_info -> ExceptionRecord - -> ExceptionInformation[1]); -# define sig SIGSEGV -# endif - - if (SIG_OK && CODE_OK) { - register struct hblk * h = - (struct hblk *)((word)addr & ~(GC_page_size-1)); - GC_bool in_allocd_block; - -# ifdef SUNOS5SIGS - /* Address is only within the correct physical page. */ - in_allocd_block = FALSE; - for (i = 0; i < divHBLKSZ(GC_page_size); i++) { - if (HDR(h+i) != 0) { - in_allocd_block = TRUE; - } - } -# else - in_allocd_block = (HDR(addr) != 0); -# endif - if (!in_allocd_block) { - /* Heap blocks now begin and end on page boundaries */ - SIG_PF old_handler; - - if (sig == SIGSEGV) { - old_handler = GC_old_segv_handler; - } else { - old_handler = GC_old_bus_handler; - } - if (old_handler == SIG_DFL) { -# ifndef MSWIN32 - GC_err_printf1("Segfault at 0x%lx\n", addr); - ABORT("Unexpected bus error or segmentation fault"); -# else - return(EXCEPTION_CONTINUE_SEARCH); -# endif - } else { -# if defined (SUNOS4) || defined(FREEBSD) - (*old_handler) (sig, code, scp, addr); - return; -# endif -# if defined (SUNOS5SIGS) - (*(REAL_SIG_PF)old_handler) (sig, scp, context); - return; -# endif -# if defined (LINUX) -# if defined(ALPHA) || defined(M68K) - (*(REAL_SIG_PF)old_handler) (sig, code, sc); -# else -# if defined(IA64) - (*(REAL_SIG_PF)old_handler) (sig, si, scp); -# else - (*(REAL_SIG_PF)old_handler) (sig, sc); -# endif -# endif - return; -# endif -# if defined (IRIX5) || defined(OSF1) - (*(REAL_SIG_PF)old_handler) (sig, code, scp); - return; -# endif -# ifdef MSWIN32 - return((*old_handler)(exc_info)); -# endif - } - } - for (i = 0; i < divHBLKSZ(GC_page_size); i++) { - register int index = PHT_HASH(h+i); - - set_pht_entry_from_index(GC_dirty_pages, index); - } - UNPROTECT(h, GC_page_size); -# if defined(OSF1) || defined(LINUX) - /* These reset the signal handler each time by default. */ - signal(SIGSEGV, (SIG_PF) GC_write_fault_handler); -# endif - /* The write may not take place before dirty bits are read. */ - /* But then we'll fault again ... */ -# ifdef MSWIN32 - return(EXCEPTION_CONTINUE_EXECUTION); -# else - return; -# endif - } -#ifdef MSWIN32 - return EXCEPTION_CONTINUE_SEARCH; -#else - GC_err_printf1("Segfault at 0x%lx\n", addr); - ABORT("Unexpected bus error or segmentation fault"); -#endif -} - -/* - * We hold the allocation lock. We expect block h to be written - * shortly. - */ -void GC_write_hint(h) -struct hblk *h; -{ - register struct hblk * h_trunc; - register unsigned i; - register GC_bool found_clean; - - if (!GC_dirty_maintained) return; - h_trunc = (struct hblk *)((word)h & ~(GC_page_size-1)); - found_clean = FALSE; - for (i = 0; i < divHBLKSZ(GC_page_size); i++) { - register int index = PHT_HASH(h_trunc+i); - - if (!get_pht_entry_from_index(GC_dirty_pages, index)) { - found_clean = TRUE; - set_pht_entry_from_index(GC_dirty_pages, index); - } - } - if (found_clean) { - UNPROTECT(h_trunc, GC_page_size); - } -} - -void GC_dirty_init() -{ -#if defined(SUNOS5SIGS) || defined(IRIX5) /* || defined(OSF1) */ - struct sigaction act, oldact; -# ifdef IRIX5 - act.sa_flags = SA_RESTART; - act.sa_handler = 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); -#endif -# ifdef PRINTSTATS - GC_printf0("Inititalizing mprotect virtual dirty bit implementation\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"); - } -# if defined(SUNOS4) || defined(FREEBSD) - GC_old_bus_handler = signal(SIGBUS, GC_write_fault_handler); - if (GC_old_bus_handler == SIG_IGN) { - GC_err_printf0("Previously ignored bus error!?"); - GC_old_bus_handler = SIG_DFL; - } - if (GC_old_bus_handler != SIG_DFL) { -# ifdef PRINTSTATS - GC_err_printf0("Replaced other SIGBUS handler\n"); -# endif - } -# endif -# if defined(OSF1) || defined(SUNOS4) || defined(LINUX) - 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!?"); - GC_old_segv_handler = SIG_DFL; - } - if (GC_old_segv_handler != SIG_DFL) { -# ifdef PRINTSTATS - GC_err_printf0("Replaced other SIGSEGV handler\n"); -# endif - } -# endif -# if defined(SUNOS5SIGS) || defined(IRIX5) -# if defined(IRIX_THREADS) || defined(IRIX_JDK_THREADS) - sigaction(SIGSEGV, 0, &oldact); - sigaction(SIGSEGV, &act, 0); -# else - sigaction(SIGSEGV, &act, &oldact); -# endif -# if defined(_sigargs) - /* 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 */ - if (oldact.sa_flags & SA_SIGINFO) { - GC_old_segv_handler = (SIG_PF)(oldact.sa_sigaction); - } else { - GC_old_segv_handler = oldact.sa_handler; - } -# endif - if (GC_old_segv_handler == SIG_IGN) { - GC_err_printf0("Previously ignored segmentation violation!?"); - GC_old_segv_handler = SIG_DFL; - } - if (GC_old_segv_handler != SIG_DFL) { -# ifdef PRINTSTATS - GC_err_printf0("Replaced other SIGSEGV handler\n"); -# endif - } -# ifdef HPUX - sigaction(SIGBUS, &act, &oldact); - GC_old_bus_handler = oldact.sa_handler; - if (GC_old_segv_handler != SIG_DFL) { -# ifdef PRINTSTATS - GC_err_printf0("Replaced other SIGBUS handler\n"); -# endif - } -# endif -# endif -# if defined(MSWIN32) - GC_old_segv_handler = SetUnhandledExceptionFilter(GC_write_fault_handler); - if (GC_old_segv_handler != NULL) { -# ifdef PRINTSTATS - GC_err_printf0("Replaced other UnhandledExceptionFilter\n"); -# endif - } else { - GC_old_segv_handler = SIG_DFL; - } -# endif -} - - - -void GC_protect_heap() -{ - ptr_t start; - word len; - unsigned i; - - 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); - } -} - -/* We assume that either the world is stopped or its OK to lose dirty */ -/* bits while this is happenning (as in GC_enable_incremental). */ -void GC_read_dirty() -{ - BCOPY((word *)GC_dirty_pages, GC_grungy_pages, - (sizeof GC_dirty_pages)); - BZERO((word *)GC_dirty_pages, (sizeof GC_dirty_pages)); - GC_protect_heap(); -} - -GC_bool GC_page_was_dirty(h) -struct hblk * h; -{ - register word index = PHT_HASH(h); - - return(HDR(h) == 0 || get_pht_entry_from_index(GC_grungy_pages, index)); -} - -/* - * Acquiring the allocation lock here is dangerous, since this - * can be called from within GC_call_with_alloc_lock, and the cord - * package does so. On systems that allow nested lock acquisition, this - * happens to work. - * On other systems, SET_LOCK_HOLDER and friends must be suitably defined. - */ - -void GC_begin_syscall() -{ - if (!I_HOLD_LOCK()) LOCK(); -} - -void GC_end_syscall() -{ - if (!I_HOLD_LOCK()) UNLOCK(); -} - -void GC_unprotect_range(addr, len) -ptr_t addr; -word len; -{ - struct hblk * start_block; - struct hblk * end_block; - register struct hblk *h; - ptr_t obj_start; - - if (!GC_incremental) return; - obj_start = GC_base(addr); - if (obj_start == 0) return; - if (GC_base(addr + len - 1) != obj_start) { - ABORT("GC_unprotect_range(range bigger than object)"); - } - start_block = (struct hblk *)((word)addr & ~(GC_page_size - 1)); - end_block = (struct hblk *)((word)(addr + len - 1) & ~(GC_page_size - 1)); - end_block += GC_page_size/HBLKSIZE - 1; - for (h = start_block; h <= end_block; h++) { - register word index = PHT_HASH(h); - - set_pht_entry_from_index(GC_dirty_pages, index); - } - UNPROTECT(start_block, - ((ptr_t)end_block - (ptr_t)start_block) + HBLKSIZE); -} - -#ifndef MSWIN32 -/* Replacement for UNIX system call. */ -/* Other calls that write to the heap */ -/* should be handled similarly. */ -# if defined(__STDC__) && !defined(SUNOS4) -# include <unistd.h> - ssize_t read(int fd, void *buf, size_t nbyte) -# else -# ifndef LINT - int read(fd, buf, nbyte) -# else - int GC_read(fd, buf, nbyte) -# endif - int fd; - char *buf; - int nbyte; -# endif -{ - int result; - - GC_begin_syscall(); - GC_unprotect_range(buf, (word)nbyte); -# ifdef IRIX5 - /* Indirect system call may not always be easily available. */ - /* We could call _read, but that would interfere with the */ - /* libpthread interception of read. */ - { - struct iovec iov; - - iov.iov_base = buf; - iov.iov_len = nbyte; - result = readv(fd, &iov, 1); - } -# else - result = syscall(SYS_read, fd, buf, nbyte); -# endif - GC_end_syscall(); - return(result); -} -#endif /* !MSWIN32 */ - -/*ARGSUSED*/ -GC_bool GC_page_was_ever_dirty(h) -struct hblk *h; -{ - return(TRUE); -} - -/* Reset the n pages starting at h to "was never dirty" status. */ -/*ARGSUSED*/ -void GC_is_fresh(h, n) -struct hblk *h; -word n; -{ -} - -# endif /* MPROTECT_VDB */ - -# ifdef PROC_VDB - -/* - * See DEFAULT_VDB for interface descriptions. - */ - -/* - * This implementaion assumes a Solaris 2.X like /proc pseudo-file-system - * from which we can read page modified bits. This facility is far from - * optimal (e.g. we would like to get the info for only some of the - * address space), but it avoids intercepting system calls. - */ - -#include <errno.h> -#include <sys/types.h> -#include <sys/signal.h> -#include <sys/fault.h> -#include <sys/syscall.h> -#include <sys/procfs.h> -#include <sys/stat.h> -#include <fcntl.h> - -#define INITIAL_BUF_SZ 4096 -word GC_proc_buf_size = INITIAL_BUF_SZ; -char *GC_proc_buf; - -#ifdef 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 */ -/* entries in GC_written_pages, since that would declare all */ -/* pages with the given hash address to be fresh. */ -# define MAX_FRESH_PAGES 8*1024 /* Must be power of 2 */ - struct hblk ** GC_fresh_pages; /* A direct mapped cache. */ - /* Collisions are dropped. */ - -# define FRESH_PAGE_SLOT(h) (divHBLKSZ((word)(h)) & (MAX_FRESH_PAGES-1)) -# define ADD_FRESH_PAGE(h) \ - GC_fresh_pages[FRESH_PAGE_SLOT(h)] = (h) -# define PAGE_IS_FRESH(h) \ - (GC_fresh_pages[FRESH_PAGE_SLOT(h)] == (h) && (h) != 0) -#endif - -/* Add all pages in pht2 to pht1 */ -void GC_or_pages(pht1, pht2) -page_hash_table pht1, pht2; -{ - register int i; - - for (i = 0; i < PHT_SIZE; i++) pht1[i] |= pht2[i]; -} - -int GC_proc_fd; - -void GC_dirty_init() -{ - int fd; - char buf[30]; - - GC_dirty_maintained = TRUE; - if (GC_words_allocd != 0 || GC_words_allocd_before_gc != 0) { - register int i; - - for (i = 0; i < PHT_SIZE; i++) GC_written_pages[i] = (word)(-1); -# ifdef PRINTSTATS - GC_printf1("Allocated words:%lu:all pages may have been written\n", - (unsigned long) - (GC_words_allocd + GC_words_allocd_before_gc)); -# endif - } - sprintf(buf, "/proc/%d", getpid()); - fd = open(buf, O_RDONLY); - if (fd < 0) { - ABORT("/proc open failed"); - } - GC_proc_fd = syscall(SYS_ioctl, fd, PIOCOPENPD, 0); - close(fd); - if (GC_proc_fd < 0) { - ABORT("/proc ioctl failed"); - } - GC_proc_buf = GC_scratch_alloc(GC_proc_buf_size); -# ifdef SOLARIS_THREADS - GC_fresh_pages = (struct hblk **) - GC_scratch_alloc(MAX_FRESH_PAGES * sizeof (struct hblk *)); - if (GC_fresh_pages == 0) { - GC_err_printf0("No space for fresh pages\n"); - EXIT(); - } - BZERO(GC_fresh_pages, MAX_FRESH_PAGES * sizeof (struct hblk *)); -# endif -} - -/* Ignore write hints. They don't help us here. */ -/*ARGSUSED*/ -void GC_write_hint(h) -struct hblk *h; -{ -} - -#ifdef SOLARIS_THREADS -# define READ(fd,buf,nbytes) syscall(SYS_read, fd, buf, nbytes) -#else -# define READ(fd,buf,nbytes) read(fd, buf, nbytes) -#endif - -void GC_read_dirty() -{ - unsigned long ps, np; - int nmaps; - ptr_t vaddr; - struct prasmap * map; - char * bufp; - ptr_t current_addr, limit; - int i; -int dummy; - - BZERO(GC_grungy_pages, (sizeof GC_grungy_pages)); - - bufp = GC_proc_buf; - if (READ(GC_proc_fd, bufp, GC_proc_buf_size) <= 0) { -# ifdef PRINTSTATS - GC_printf1("/proc read failed: GC_proc_buf_size = %lu\n", - GC_proc_buf_size); -# endif - { - /* Retry with larger buffer. */ - word new_size = 2 * GC_proc_buf_size; - char * new_buf = GC_scratch_alloc(new_size); - - if (new_buf != 0) { - 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) { - 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 - BZERO(GC_fresh_pages, - MAX_FRESH_PAGES * sizeof (struct hblk *)); -# endif - return; - } - } - } - /* Copy dirty bits into GC_grungy_pages */ - nmaps = ((struct prpageheader *)bufp) -> pr_nmap; - /* printf( "nmaps = %d, PG_REFERENCED = %d, PG_MODIFIED = %d\n", - nmaps, PG_REFERENCED, PG_MODIFIED); */ - bufp = bufp + sizeof(struct prpageheader); - for (i = 0; i < nmaps; i++) { - map = (struct prasmap *)bufp; - vaddr = (ptr_t)(map -> pr_vaddr); - ps = map -> pr_pagesize; - np = map -> pr_npage; - /* printf("vaddr = 0x%X, ps = 0x%X, np = 0x%X\n", vaddr, ps, np); */ - limit = vaddr + ps * np; - bufp += sizeof (struct prasmap); - for (current_addr = vaddr; - current_addr < limit; current_addr += ps){ - if ((*bufp++) & PG_MODIFIED) { - register struct hblk * h = (struct hblk *) current_addr; - - while ((ptr_t)h < current_addr + ps) { - register word index = PHT_HASH(h); - - set_pht_entry_from_index(GC_grungy_pages, index); -# ifdef SOLARIS_THREADS - { - register int slot = FRESH_PAGE_SLOT(h); - - if (GC_fresh_pages[slot] == h) { - GC_fresh_pages[slot] = 0; - } - } -# endif - h++; - } - } - } - bufp += sizeof(long) - 1; - bufp = (char *)((unsigned long)bufp & ~(sizeof(long)-1)); - } - /* Update GC_written_pages. */ - GC_or_pages(GC_written_pages, GC_grungy_pages); -# ifdef SOLARIS_THREADS - /* Make sure that old stacks are considered completely clean */ - /* unless written again. */ - GC_old_stacks_are_fresh(); -# endif -} - -#undef READ - -GC_bool GC_page_was_dirty(h) -struct hblk *h; -{ - register word index = PHT_HASH(h); - register GC_bool result; - - result = get_pht_entry_from_index(GC_grungy_pages, index); -# ifdef 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 */ - /* thread stack. It's OK to treat it as clean, in */ - /* that case. And it's consistent with */ - /* GC_page_was_ever_dirty. */ -# endif - return(result); -} - -GC_bool GC_page_was_ever_dirty(h) -struct hblk *h; -{ - register word index = PHT_HASH(h); - register GC_bool result; - - result = get_pht_entry_from_index(GC_written_pages, index); -# ifdef SOLARIS_THREADS - if (result && PAGE_IS_FRESH(h)) result = FALSE; -# endif - return(result); -} - -/* Caller holds allocation lock. */ -void GC_is_fresh(h, n) -struct hblk *h; -word n; -{ - - register word index; - -# ifdef SOLARIS_THREADS - register word i; - - if (GC_fresh_pages != 0) { - for (i = 0; i < n; i++) { - ADD_FRESH_PAGE(h + i); - } - } -# endif -} - -# endif /* PROC_VDB */ - - -# ifdef PCR_VDB - -# include "vd/PCR_VD.h" - -# define NPAGES (32*1024) /* 128 MB */ - -PCR_VD_DB GC_grungy_bits[NPAGES]; - -ptr_t GC_vd_base; /* Address corresponding to GC_grungy_bits[0] */ - /* HBLKSIZE aligned. */ - -void GC_dirty_init() -{ - GC_dirty_maintained = TRUE; - /* For the time being, we assume the heap generally grows up */ - GC_vd_base = GC_heap_sects[0].hs_start; - if (GC_vd_base == 0) { - ABORT("Bad initial heap segment"); - } - if (PCR_VD_Start(HBLKSIZE, GC_vd_base, NPAGES*HBLKSIZE) - != PCR_ERes_okay) { - ABORT("dirty bit initialization failed"); - } -} - -void GC_read_dirty() -{ - /* lazily enable dirty bits on newly added heap sects */ - { - static int onhs = 0; - int nhs = GC_n_heap_sects; - for( ; onhs < nhs; onhs++ ) { - PCR_VD_WriteProtectEnable( - GC_heap_sects[onhs].hs_start, - GC_heap_sects[onhs].hs_bytes ); - } - } - - - if (PCR_VD_Clear(GC_vd_base, NPAGES*HBLKSIZE, GC_grungy_bits) - != PCR_ERes_okay) { - ABORT("dirty bit read failed"); - } -} - -GC_bool GC_page_was_dirty(h) -struct hblk *h; -{ - if((ptr_t)h < GC_vd_base || (ptr_t)h >= GC_vd_base + NPAGES*HBLKSIZE) { - return(TRUE); - } - return(GC_grungy_bits[h - (struct hblk *)GC_vd_base] & PCR_VD_DB_dirtyBit); -} - -/*ARGSUSED*/ -void GC_write_hint(h) -struct hblk *h; -{ - PCR_VD_WriteProtectDisable(h, HBLKSIZE); - PCR_VD_WriteProtectEnable(h, HBLKSIZE); -} - -# endif /* PCR_VDB */ - -/* - * Call stack save code for debugging. - * Should probably be in mach_dep.c, but that requires reorganization. - */ -#if defined(SPARC) && !defined(LINUX) -# if defined(SUNOS4) -# include <machine/frame.h> -# else -# if defined (DRSNX) -# include <sys/sparc/frame.h> -# else -# if defined(OPENBSD) -# include <frame.h> -# else -# include <sys/frame.h> -# endif -# endif -# endif -# if NARGS > 6 - --> We only know how to to get the first 6 arguments -# endif - -#ifdef SAVE_CALL_CHAIN -/* Fill in the pc and argument information for up to NFRAMES of my */ -/* callers. Ignore my frame and my callers frame. */ - -#ifdef OPENBSD -# define FR_SAVFP fr_fp -# define FR_SAVPC fr_pc -#else -# define FR_SAVFP fr_savfp -# define FR_SAVPC fr_savpc -#endif - -void GC_save_callers (info) -struct callinfo info[NFRAMES]; -{ - struct frame *frame; - struct frame *fp; - int nframes = 0; - word GC_save_regs_in_stack(); - - frame = (struct frame *) GC_save_regs_in_stack (); - - for (fp = frame -> FR_SAVFP; fp != 0 && nframes < NFRAMES; - fp = fp -> FR_SAVFP, nframes++) { - 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 (nframes < NFRAMES) info[nframes].ci_pc = 0; -} - -#endif /* SAVE_CALL_CHAIN */ -#endif /* SPARC */ - - - |