diff options
Diffstat (limited to '')
| -rw-r--r-- | gc/os_dep.c | 1368 |
1 files changed, 1004 insertions, 364 deletions
diff --git a/gc/os_dep.c b/gc/os_dep.c index 0236248..79bed4c 100644 --- a/gc/os_dep.c +++ b/gc/os_dep.c @@ -1,6 +1,8 @@ /* + * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved. - * Copyright (c) 1996-1997 by Silicon Graphics. 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. @@ -12,7 +14,7 @@ * modified is included with the above copyright notice. */ -# include "gc_priv.h" +# include "private/gc_priv.h" # if defined(LINUX) && !defined(POWERPC) # include <linux/version.h> @@ -31,7 +33,7 @@ /* make sure the former gets defined to be the latter if appropriate. */ # include <features.h> # if 2 <= __GLIBC__ -# if 0 == __GLIBC_MINOR__ +# 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> @@ -43,7 +45,8 @@ # endif /* 2 <= __GLIBC__ */ # endif # endif -# if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS) +# if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS) \ + && !defined(MSWINCE) # include <sys/types.h> # if !defined(MSWIN32) && !defined(SUNOS4) # include <unistd.h> @@ -51,29 +54,33 @@ # endif # include <stdio.h> -# include <signal.h> +# if defined(MSWINCE) +# define SIGSEGV 0 /* value is irrelevant */ +# else +# include <signal.h> +# endif /* Blatantly OS dependent routines, except for those that are related */ -/* dynamic loading. */ +/* 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) +# if !defined(STACKBOTTOM) && defined(HEURISTIC2) # define NEED_FIND_LIMIT # endif -# if (defined(SUNOS4) & defined(DYNAMIC_LOADING)) && !defined(PCR) +# if defined(IRIX_THREADS) || defined(HPUX_THREADS) # define NEED_FIND_LIMIT # endif -# if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR) +# if (defined(SUNOS4) && defined(DYNAMIC_LOADING)) && !defined(PCR) # define NEED_FIND_LIMIT # endif -# if defined(LINUX) && (defined(POWERPC) || defined(SPARC) || \ - defined(ALPHA) || defined(MIPS)) +# if (defined(SVR4) || defined(AUX) || defined(DGUX) \ + || (defined(LINUX) && defined(SPARC))) && !defined(PCR) # define NEED_FIND_LIMIT # endif @@ -86,13 +93,12 @@ #endif #ifdef AMIGA -# include <proto/exec.h> -# include <proto/dos.h> -# include <dos/dosextens.h> -# include <workbench/startup.h> +# define GC_AMIGA_DEF +# include "AmigaOS.c" +# undef GC_AMIGA_DEF #endif -#ifdef MSWIN32 +#if defined(MSWIN32) || defined(MSWINCE) # define WIN32_LEAN_AND_MEAN # define NOSERVICE # include <windows.h> @@ -110,11 +116,16 @@ # include <sys/types.h> # include <sys/mman.h> # include <sys/stat.h> +#endif + +#ifdef UNIX_LIKE # include <fcntl.h> #endif -#ifdef SUNOS5SIGS -# include <sys/siginfo.h> +#if defined(SUNOS5SIGS) || defined (HURD) || defined(LINUX) +# ifdef SUNOS5SIGS +# include <sys/siginfo.h> +# endif # undef setjmp # undef longjmp # define setjmp(env) sigsetjmp(env, 1) @@ -123,7 +134,7 @@ #endif #ifdef DJGPP - /* Apparently necessary for djgpp 2.01. May casuse problems with */ + /* Apparently necessary for djgpp 2.01. May cause problems with */ /* other versions. */ typedef long unsigned int caddr_t; #endif @@ -140,21 +151,84 @@ # define OPT_PROT_EXEC 0 #endif -#if defined(LINUX) && (defined(POWERPC) || defined(SPARC) || \ - defined(ALPHA) || defined(MIPS)) +#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 */ /* 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. */ +# ifdef LINUX +# pragma weak __data_start + extern int __data_start; +# pragma weak data_start + extern int data_start; +# endif /* LINUX */ + extern int _end; + + ptr_t GC_data_start; void GC_init_linux_data_start() { extern ptr_t GC_find_limit(); - GC_data_start = GC_find_limit((ptr_t)GC_copyright, FALSE); +# ifdef LINUX + /* Try the easy approaches first: */ + if (&__data_start != 0) { + GC_data_start = (ptr_t)(&__data_start); + return; + } + if (&data_start != 0) { + GC_data_start = (ptr_t)(&data_start); + return; + } +# endif /* LINUX */ + GC_data_start = GC_find_limit((ptr_t)(&_end), 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 */ + +#if defined(NETBSD) && defined(__ELF__) + ptr_t GC_data_start; + + void GC_init_netbsd_elf() + { + extern ptr_t GC_find_limit(); + extern char **environ; + /* This may need to be environ, without the underscore, for */ + /* some versions. */ + GC_data_start = GC_find_limit((ptr_t)&environ, FALSE); } #endif @@ -262,9 +336,10 @@ void GC_enable_signals(void) # else # if !defined(PCR) && !defined(AMIGA) && !defined(MSWIN32) \ + && !defined(MSWINCE) \ && !defined(MACOS) && !defined(DJGPP) && !defined(DOS4GW) -# 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)) @@ -337,7 +412,7 @@ void GC_enable_signals() # endif /*!OS/2 */ /* Ivan Demakov: simplest way (to me) */ -#ifdef DOS4GW +#if defined (DOS4GW) void GC_disable_signals() { } void GC_enable_signals() { } #endif @@ -345,13 +420,11 @@ void GC_enable_signals() /* Find the page size */ word GC_page_size; -# ifdef MSWIN32 +# if defined(MSWIN32) || defined(MSWINCE) void GC_setpagesize() { - SYSTEM_INFO sysinfo; - - GetSystemInfo(&sysinfo); - GC_page_size = sysinfo.dwPageSize; + GetSystemInfo(&GC_sysinfo); + GC_page_size = GC_sysinfo.dwPageSize; } # else @@ -376,7 +449,7 @@ word GC_page_size; * With threads, GC_mark_roots needs to know how to do this. * Called with allocator lock held. */ -# ifdef MSWIN32 +# if defined(MSWIN32) || defined(MSWINCE) # define is_writable(prot) ((prot) == PAGE_READWRITE \ || (prot) == PAGE_WRITECOPY \ || (prot) == PAGE_EXECUTE_READWRITE \ @@ -413,7 +486,17 @@ ptr_t GC_get_stack_base() } -# else +# endif /* MS Windows */ + +# ifdef BEOS +# include <kernel/OS.h> +ptr_t GC_get_stack_base(){ + thread_info th; + get_thread_info(find_thread(NULL),&th); + return th.stack_end; +} +# endif /* BEOS */ + # ifdef OS2 @@ -429,67 +512,15 @@ ptr_t GC_get_stack_base() return((ptr_t)(ptib -> tib_pstacklimit)); } -# else +# endif /* OS2 */ # ifdef AMIGA +# define GC_AMIGA_SB +# include "AmigaOS.c" +# undef GC_AMIGA_SB +# endif /* 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); - } +# if defined(NEED_FIND_LIMIT) || (defined(UNIX_LIKE) && !defined(ECOS)) # ifdef __STDC__ typedef void (*handler)(int); @@ -497,22 +528,32 @@ ptr_t GC_get_stack_base() typedef void (*handler)(); # endif -# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1) +# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1) || defined(HURD) static struct sigaction old_segv_act; -# if defined(_sigargs) /* !Irix6.x */ +# if defined(_sigargs) /* !Irix6.x */ || defined(HPUX) || defined(HURD) static struct sigaction old_bus_act; # endif # else static handler old_segv_handler, old_bus_handler; # endif - void GC_setup_temporary_fault_handler() +# ifdef __STDC__ + void GC_set_and_save_fault_handler(handler h) +# else + void GC_set_and_save_fault_handler(h) + handler h; +# endif { -# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1) +# if defined(SUNOS5SIGS) || defined(IRIX5) \ + || defined(OSF1) || defined(HURD) struct sigaction act; - act.sa_handler = GC_fault_handler; - act.sa_flags = SA_RESTART | SA_NODEFER; + act.sa_handler = h; +# ifdef SUNOS5SIGS + act.sa_flags = SA_RESTART | SA_NODEFER; +# else + act.sa_flags = SA_RESTART; +# endif /* 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 */ @@ -527,26 +568,47 @@ ptr_t GC_get_stack_base() (void) sigaction(SIGSEGV, &act, 0); # else (void) sigaction(SIGSEGV, &act, &old_segv_act); -# ifdef _sigargs /* Irix 5.x, not 6.x */ - /* Under 5.x, we may get SIGBUS. */ - /* Pthreads doesn't exist under 5.x, so we don't */ - /* have to worry in the threads case. */ +# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \ + || defined(HPUX) || defined(HURD) + /* 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); + old_segv_handler = signal(SIGSEGV, h); # ifdef SIGBUS - old_bus_handler = signal(SIGBUS, GC_fault_handler); + old_bus_handler = signal(SIGBUS, h); # endif # endif } +# 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; + + /*ARGSUSED*/ + void GC_fault_handler(sig) + int sig; + { + longjmp(GC_jmp_buf, 1); + } + + void GC_setup_temporary_fault_handler() + { + GC_set_and_save_fault_handler(GC_fault_handler); + } void GC_reset_fault_handler() { -# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1) +# if defined(SUNOS5SIGS) || defined(IRIX5) \ + || defined(OSF1) || defined(HURD) (void) sigaction(SIGSEGV, &old_segv_act, 0); -# ifdef _sigargs /* Irix 5.x, not 6.x */ +# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \ + || defined(HPUX) || defined(HURD) (void) sigaction(SIGBUS, &old_bus_act, 0); # endif # else @@ -591,6 +653,104 @@ ptr_t GC_get_stack_base() } # endif +#ifdef LINUX_STACKBOTTOM + +#include <sys/types.h> +#include <sys/stat.h> + +# define STAT_SKIP 27 /* Number of fields preceding startstack */ + /* field in /proc/self/stat */ + +# pragma weak __libc_stack_end + extern ptr_t __libc_stack_end; + +# ifdef IA64 +# pragma weak __libc_ia64_register_backing_store_base + extern ptr_t __libc_ia64_register_backing_store_base; + + 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; + } + } +# endif + + ptr_t GC_linux_stack_base(void) + { + /* We read the stack base value from /proc/self/stat. We do this */ + /* 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 + char stat_buf[STAT_BUF_SIZE]; + int f; + char c; + word result = 0; + 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; + } + 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"); + } + c = stat_buf[buf_offset++]; + /* 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 = stat_buf[buf_offset++]; + while (!isspace(c)) c = stat_buf[buf_offset++]; + } + while (isspace(c)) c = stat_buf[buf_offset++]; + while (isdigit(c)) { + result *= 10; + result += c - '0'; + c = stat_buf[buf_offset++]; + } + close(f); + if (result < 0x10000000) ABORT("Absurd stack bottom value"); + return (ptr_t)result; + } + +#endif /* LINUX_STACKBOTTOM */ + +#ifdef FREEBSD_STACKBOTTOM + +/* This uses an undocumented sysctl call, but at least one expert */ +/* believes it will stay. */ + +#include <unistd.h> +#include <sys/types.h> +#include <sys/sysctl.h> + + 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); + + if (r) ABORT("Error getting stack base"); + + return (ptr_t)base; + } + +#endif /* FREEBSD_STACKBOTTOM */ + +#if !defined(BEOS) && !defined(AMIGA) && !defined(MSWIN32) \ + && !defined(MSWINCE) && !defined(OS2) && !defined(ECOS) ptr_t GC_get_stack_base() { @@ -612,6 +772,12 @@ ptr_t GC_get_stack_base() & ~STACKBOTTOM_ALIGNMENT_M1); # endif # endif /* HEURISTIC1 */ +# ifdef LINUX_STACKBOTTOM + result = GC_linux_stack_base(); +# endif +# ifdef FREEBSD_STACKBOTTOM + result = GC_freebsd_stack_base(); +# endif # ifdef HEURISTIC2 # ifdef STACK_GROWS_DOWN result = GC_find_limit((ptr_t)(&dummy), TRUE); @@ -639,9 +805,7 @@ ptr_t GC_get_stack_base() # endif /* STACKBOTTOM */ } -# endif /* ! AMIGA */ -# endif /* ! OS2 */ -# endif /* ! MSWIN32 */ +# endif /* ! AMIGA, !OS 2, ! MS Windows, !BEOS */ /* * Register static data segment(s) as roots. @@ -741,7 +905,9 @@ void GC_register_data_segments() } } -# else +# else /* !OS2 */ + +# if defined(MSWIN32) || defined(MSWINCE) # ifdef MSWIN32 /* Unfortunately, we have to handle win32s very differently from NT, */ @@ -765,21 +931,19 @@ void GC_register_data_segments() { 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; + limit = GC_sysinfo.lpMinimumApplicationAddress; p = (ptr_t)((word)start & ~(GC_page_size - 1)); for (;;) { q = (LPVOID)(p - GC_page_size); @@ -790,6 +954,7 @@ void GC_register_data_segments() } return(p); } +# endif /* Is p the start of either the malloc heap, or of one of our */ /* heap sections? */ @@ -803,7 +968,11 @@ void GC_register_data_segments() if (0 == malloc_heap_pointer) { MEMORY_BASIC_INFORMATION buf; - register DWORD result = VirtualQuery(malloc(1), &buf, sizeof(buf)); + void *pTemp = malloc( 1 ); + register DWORD result = VirtualQuery(pTemp, &buf, sizeof(buf)); + + free( pTemp ); + if (result != sizeof(buf)) { ABORT("Weird VirtualQuery result"); @@ -817,11 +986,11 @@ void GC_register_data_segments() } return(FALSE); } - + +# ifdef MSWIN32 void GC_register_root_section(ptr_t static_root) { MEMORY_BASIC_INFORMATION buf; - SYSTEM_INFO sysinfo; DWORD result; DWORD protect; LPVOID p; @@ -830,8 +999,7 @@ void GC_register_data_segments() if (!GC_win32s) return; p = base = limit = GC_least_described_address(static_root); - GetSystemInfo(&sysinfo); - while (p < sysinfo.lpMaximumApplicationAddress) { + while (p < GC_sysinfo.lpMaximumApplicationAddress) { result = VirtualQuery(p, &buf, sizeof(buf)); if (result != sizeof(buf) || buf.AllocationBase == 0 || GC_is_heap_base(buf.AllocationBase)) break; @@ -852,129 +1020,20 @@ void GC_register_data_segments() } if (base != limit) GC_add_roots_inner(base, limit, FALSE); } +#endif void GC_register_data_segments() { +# ifdef MSWIN32 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 +# else /* !OS2 && !Windows */ -# if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR) +# if (defined(SVR4) || defined(AUX) || defined(DGUX) \ + || (defined(LINUX) && defined(SPARC))) && !defined(PCR) char * GC_SysVGetDataStart(max_page_size, etext_addr) int max_page_size; int * etext_addr; @@ -1008,6 +1067,14 @@ int * etext_addr; # endif +#ifdef AMIGA + +# define GC_AMIGA_DS +# include "AmigaOS.c" +# undef GC_AMIGA_DS + +#else /* !OS2 && !Windows && !AMIGA */ + void GC_register_data_segments() { # if !defined(PCR) && !defined(SRC_M3) && !defined(NEXT) && !defined(MACOS) \ @@ -1067,15 +1134,16 @@ void GC_register_data_segments() } # endif /* ! AMIGA */ -# endif /* ! MSWIN32 */ +# endif /* ! MSWIN32 && ! MSWINCE*/ # endif /* ! OS2 */ /* * Auxiliary routines for obtaining memory from OS. */ - + # if !defined(OS2) && !defined(PCR) && !defined(AMIGA) \ - && !defined(MSWIN32) && !defined(MACOS) && !defined(DOS4GW) + && !defined(MSWIN32) && !defined(MSWINCE) \ + && !defined(MACOS) && !defined(DOS4GW) # ifdef SUNOS4 extern caddr_t sbrk(); @@ -1086,6 +1154,7 @@ void GC_register_data_segments() # 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 */ @@ -1118,7 +1187,7 @@ word bytes; #else /* Not RS6000 */ #if defined(USE_MMAP) -/* Tested only under IRIX5 and Solaris 2 */ +/* Tested only under Linux, IRIX5 and Solaris 2 */ #ifdef USE_MMAP_FIXED # define GC_MMAP_FLAGS MAP_FIXED | MAP_PRIVATE @@ -1128,6 +1197,10 @@ word bytes; # define GC_MMAP_FLAGS MAP_PRIVATE #endif +#ifndef HEAP_START +# define HEAP_START 0 +#endif + ptr_t GC_unix_get_mem(bytes) word bytes; { @@ -1146,6 +1219,18 @@ word bytes; 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)); +# if !defined(LINUX) + if (last_addr == 0) { + /* Oops. We got the end of the address space. This isn't */ + /* usable by arbitrary C code, since one-past-end pointers */ + /* don't work, so we discard it and try again. */ + munmap(result, (size_t)(-GC_page_size) - (size_t)result); + /* Leave last page mapped, so we can't repeat. */ + return GC_unix_get_mem(bytes); + } +# else + GC_ASSERT(last_addr != 0); +# endif return((ptr_t)result); } @@ -1199,6 +1284,11 @@ void * os2_alloc(size_t bytes) # endif /* OS2 */ +# if defined(MSWIN32) || defined(MSWINCE) +SYSTEM_INFO GC_sysinfo; +# endif + + # ifdef MSWIN32 word GC_n_heap_bases = 0; @@ -1206,7 +1296,7 @@ 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 */ @@ -1235,20 +1325,81 @@ void GC_win32_free_heap () } } } +# endif + +#ifdef AMIGA +# define GC_AMIGA_AM +# include "AmigaOS.c" +# undef GC_AMIGA_AM +#endif + +# ifdef MSWINCE +word GC_n_heap_bases = 0; + +ptr_t GC_wince_get_mem(bytes) +word bytes; +{ + ptr_t result; + word i; + + /* Round up allocation size to multiple of page size */ + bytes = (bytes + GC_page_size-1) & ~(GC_page_size-1); + + /* Try to find reserved, uncommitted pages */ + for (i = 0; i < GC_n_heap_bases; i++) { + if (((word)(-(signed_word)GC_heap_lengths[i]) + & (GC_sysinfo.dwAllocationGranularity-1)) + >= bytes) { + result = GC_heap_bases[i] + GC_heap_lengths[i]; + break; + } + } + + if (i == GC_n_heap_bases) { + /* Reserve more pages */ + word res_bytes = (bytes + GC_sysinfo.dwAllocationGranularity-1) + & ~(GC_sysinfo.dwAllocationGranularity-1); + result = (ptr_t) VirtualAlloc(NULL, res_bytes, + MEM_RESERVE | MEM_TOP_DOWN, + 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; + GC_heap_lengths[GC_n_heap_bases] = 0; + GC_n_heap_bases++; + } + + /* Commit pages */ + result = (ptr_t) VirtualAlloc(result, bytes, + MEM_COMMIT, + PAGE_EXECUTE_READWRITE); + if (result != NULL) { + if (HBLKDISPL(result) != 0) ABORT("Bad VirtualAlloc result"); + GC_heap_lengths[i] += bytes; + } + return(result); +} # endif #ifdef USE_MUNMAP -/* For now, this only works on some Unix-like systems. If you */ -/* have something else, don't define USE_MUNMAP. */ +/* For now, this only works on Win32/WinCE and some Unix-like */ +/* systems. If you have something else, don't define */ +/* USE_MUNMAP. */ /* We assume ANSI C to support this feature. */ + +#if !defined(MSWIN32) && !defined(MSWINCE) + #include <unistd.h> #include <sys/mman.h> #include <sys/stat.h> #include <sys/types.h> -#include <fcntl.h> + +#endif /* Compute a page aligned starting address for the unmap */ /* operation on a block of size bytes starting at start. */ @@ -1272,6 +1423,14 @@ ptr_t GC_unmap_end(ptr_t start, word bytes) return end_addr; } +/* Under Win32/WinCE we commit (map) and decommit (unmap) */ +/* memory using VirtualAlloc and VirtualFree. These functions */ +/* work on individual allocations of virtual memory, made */ +/* previously using VirtualAlloc with the MEM_RESERVE flag. */ +/* The ranges we need to (de)commit may span several of these */ +/* allocations; therefore we use VirtualQuery to check */ +/* allocation lengths, and split up the range as necessary. */ + /* 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. */ @@ -1281,8 +1440,24 @@ void GC_unmap(ptr_t start, word 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; +# if defined(MSWIN32) || defined(MSWINCE) + while (len != 0) { + MEMORY_BASIC_INFORMATION mem_info; + GC_word free_len; + if (VirtualQuery(start_addr, &mem_info, sizeof(mem_info)) + != sizeof(mem_info)) + ABORT("Weird VirtualQuery result"); + free_len = (len < mem_info.RegionSize) ? len : mem_info.RegionSize; + if (!VirtualFree(start_addr, free_len, MEM_DECOMMIT)) + ABORT("VirtualFree failed"); + GC_unmapped_bytes += free_len; + start_addr += free_len; + len -= free_len; + } +# else + if (munmap(start_addr, len) != 0) ABORT("munmap failed"); + GC_unmapped_bytes += len; +# endif } @@ -1294,14 +1469,35 @@ void GC_remap(ptr_t start, word 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; +# if defined(MSWIN32) || defined(MSWINCE) + if (0 == start_addr) return; + while (len != 0) { + MEMORY_BASIC_INFORMATION mem_info; + GC_word alloc_len; + if (VirtualQuery(start_addr, &mem_info, sizeof(mem_info)) + != sizeof(mem_info)) + ABORT("Weird VirtualQuery result"); + alloc_len = (len < mem_info.RegionSize) ? len : mem_info.RegionSize; + result = VirtualAlloc(start_addr, alloc_len, + MEM_COMMIT, + PAGE_EXECUTE_READWRITE); + if (result != start_addr) { + ABORT("VirtualAlloc remapping failed"); + } + GC_unmapped_bytes -= alloc_len; + start_addr += alloc_len; + len -= alloc_len; + } +# else + 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; +# endif } /* Two adjacent blocks have already been unmapped and are about to */ @@ -1322,16 +1518,31 @@ void GC_unmap_gap(ptr_t start1, word bytes1, ptr_t start2, word 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; +# if defined(MSWIN32) || defined(MSWINCE) + while (len != 0) { + MEMORY_BASIC_INFORMATION mem_info; + GC_word free_len; + if (VirtualQuery(start_addr, &mem_info, sizeof(mem_info)) + != sizeof(mem_info)) + ABORT("Weird VirtualQuery result"); + free_len = (len < mem_info.RegionSize) ? len : mem_info.RegionSize; + if (!VirtualFree(start_addr, free_len, MEM_DECOMMIT)) + ABORT("VirtualFree failed"); + GC_unmapped_bytes += free_len; + start_addr += free_len; + len -= free_len; + } +# else + if (len != 0 && munmap(start_addr, len) != 0) ABORT("munmap failed"); + GC_unmapped_bytes += len; +# endif } #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. */ +/* thread stacks. */ #ifndef THREADS void (*GC_push_other_roots)() = 0; #else /* THREADS */ @@ -1358,7 +1569,7 @@ PCR_ERes GC_push_old_obj(void *p, size_t size, PCR_Any data) } -void GC_default_push_other_roots() +void GC_default_push_other_roots GC_PROTO((void)) { /* Traverse data allocated by previous memory managers. */ { @@ -1386,6 +1597,10 @@ void GC_default_push_other_roots() --> misconfigured # endif +void GC_push_thread_structures GC_PROTO((void)) +{ + /* Not our responsibibility. */ +} extern void ThreadF__ProcessStacks(); @@ -1403,37 +1618,19 @@ 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); - } + GC_PUSH_ONE_STACK(q, p); } /* 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() +void GC_default_push_other_roots GC_PROTO((void)) { - /* 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); - } + /* 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 in GC_push_roots */ + RTMain__GlobalMapProc(GC_m3_push_root, 0, GC_TracedRefTypes); if (GC_words_allocd > 0) { ThreadF__ProcessStacks(GC_push_thread_stack); } @@ -1445,24 +1642,24 @@ void GC_default_push_other_roots() # if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \ || defined(IRIX_THREADS) || defined(LINUX_THREADS) \ - || defined(IRIX_PCR_THREADS) + || defined(HPUX_THREADS) extern void GC_push_all_stacks(); -void GC_default_push_other_roots() +void GC_default_push_other_roots GC_PROTO((void)) { GC_push_all_stacks(); } # endif /* SOLARIS_THREADS || ... */ -void (*GC_push_other_roots)() = GC_default_push_other_roots; +void (*GC_push_other_roots) GC_PROTO((void)) = GC_default_push_other_roots; #endif /* * Routines for accessing dirty bits on virtual pages. - * We plan to eventaually implement four strategies for doing so: + * We plan to eventually 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. @@ -1565,26 +1762,28 @@ struct hblk *h; * not to work under a number of other systems. */ -# ifndef MSWIN32 +# if !defined(MSWIN32) && !defined(MSWINCE) # include <sys/mman.h> # include <signal.h> # include <sys/syscall.h> # define PROTECT(addr, len) \ - if (mprotect((caddr_t)(addr), (int)(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), (int)(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> +# ifndef MSWINCE +# include <signal.h> +# endif static DWORD protect_junk; # define PROTECT(addr, len) \ @@ -1605,30 +1804,57 @@ struct hblk *h; #if defined(SUNOS4) || defined(FREEBSD) typedef void (* SIG_PF)(); #endif -#if defined(SUNOS5SIGS) || defined(OSF1) || defined(LINUX) +#if defined(SUNOS5SIGS) || defined(OSF1) || defined(LINUX) \ + || defined(MACOSX) || defined(HURD) +# 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(MSWINCE) + typedef LONG (WINAPI *SIG_PF)(struct _EXCEPTION_POINTERS *); +# 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 #if defined(SUNOS5SIGS) - typedef void (* REAL_SIG_PF)(int, struct siginfo *, void *); +# 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) +# 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) || defined(HP_PA) + typedef void (* REAL_SIG_PF)(int, siginfo_t *, s_c *); +# else + typedef void (* REAL_SIG_PF)(int, s_c); +# endif +# endif # ifdef ALPHA - typedef void (* REAL_SIG_PF)(int, int, s_c *); /* Retrieve fault address from sigcontext structure by decoding */ /* instruction. */ char * get_fault_addr(s_c *sc) { @@ -1640,14 +1866,187 @@ struct hblk *h; faultaddr += (word) (((int)instr << 16) >> 16); return (char *)faultaddr; } -# else /* !ALPHA */ - typedef void (* REAL_SIG_PF)(int, s_c); # 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 */ + SIG_PF GC_old_bus_handler; SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */ +#ifdef 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 */ +/* check whether we are already in the handler and use the dumb but */ +/* safe fallback algorithm of setting all bits in the word. */ +/* Contention should be very rare, so we do the minimum to handle it */ +/* correctly. */ +#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)) {} + /* Could also revert to set_pht_entry_from_index_safe if initial */ + /* GC_test_and_set fails. */ + set_pht_entry_from_index(db, index); + GC_clear(&fault_handler_lock); + } +#else /* !GC_TEST_AND_SET_DEFINED */ + /* THIS IS INCORRECT! The dirty bit vector may be temporarily wrong, */ + /* just before we notice the conflict and correct it. We may end up */ + /* looking at it while it's wrong. But this requires contention */ + /* exactly when a GC is triggered, which seems far less likely to */ + /* fail than the old code, which had no reported failures. Thus we */ + /* leave it this way while we think of something better, or support */ + /* GC_test_and_set on the remaining platforms. */ + static VOLATILE word currently_updating = 0; + void async_set_pht_entry_from_index(VOLATILE page_hash_table db, int index) { + unsigned int update_dummy; + currently_updating = (word)(&update_dummy); + set_pht_entry_from_index(db, index); + /* If we get contention in the 10 or so instruction window here, */ + /* and we get stopped by a GC between the two updates, we lose! */ + if (currently_updating != (word)(&update_dummy)) { + set_pht_entry_from_index_safe(db, index); + /* We claim that if two threads concurrently try to update the */ + /* dirty bit vector, the first one to execute UPDATE_START */ + /* will see it changed when UPDATE_END is executed. (Note that */ + /* &update_dummy must differ in two distinct threads.) It */ + /* will then execute set_pht_entry_from_index_safe, thus */ + /* returning us to a safe state, though not soon enough. */ + } + } +#endif /* !GC_TEST_AND_SET_DEFINED */ +#else /* !THREADS */ +# define async_set_pht_entry_from_index(db, index) \ + set_pht_entry_from_index(db, index) +#endif /* !THREADS */ + /*ARGSUSED*/ # if defined (SUNOS4) || defined(FREEBSD) void GC_write_fault_handler(sig, code, scp, addr) @@ -1665,43 +2064,78 @@ SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */ # define CODE_OK (code == BUS_PAGE_FAULT) # endif # endif -# if defined(IRIX5) || defined(OSF1) +# 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 +# ifdef HURD +# define SIG_OK (sig == SIGBUS || sig == SIGSEGV) +# define CODE_OK TRUE +# endif # endif # if defined(LINUX) -# ifdef ALPHA +# if defined(ALPHA) || defined(M68K) void GC_write_fault_handler(int sig, int code, s_c * sc) # else - void GC_write_fault_handler(int sig, s_c sc) +# if defined(IA64) || defined(HP_PA) + 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, but is that useful? */ - /* We assume Intel architecture, so alignment */ - /* faults are not possible. */ + /* Empirically c.trapno == 14, on IA32, but is that useful? */ + /* Should probably consider alignment issues on other */ + /* architectures. */ # endif # if defined(SUNOS5SIGS) - void GC_write_fault_handler(int sig, struct siginfo *scp, void * context) -# define SIG_OK (sig == SIGSEGV) -# define CODE_OK (scp -> si_code == SEGV_ACCERR) +# 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(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 -# if defined(MSWIN32) + +# if defined(MSWIN32) || defined(MSWINCE) LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info) # define SIG_OK (exc_info -> ExceptionRecord -> ExceptionCode == \ - EXCEPTION_ACCESS_VIOLATION) + STATUS_ACCESS_VIOLATION) # define CODE_OK (exc_info -> ExceptionRecord -> ExceptionInformation[0] == 1) /* Write fault */ # endif { register unsigned i; +# if defined(HURD) + char *addr = (char *) code; +# endif # ifdef IRIX5 char * addr = (char *) (size_t) (scp -> sc_badvaddr); # endif @@ -1718,7 +2152,7 @@ SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */ # if defined(M68K) char * addr = NULL; - struct sigcontext *scp = (struct sigcontext *)(&sc); + struct sigcontext *scp = (struct sigcontext *)(sc); int format = (scp->sc_formatvec >> 12) & 0xf; unsigned long *framedata = (unsigned long *)(scp + 1); @@ -1730,6 +2164,10 @@ SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */ } else if (format == 7) { /* 68040 */ ea = framedata[3]; + if (framedata[1] & 0x08000000) { + /* correct addr on misaligned access */ + ea = (ea+4095)&(~4095); + } } else if (format == 4) { /* 68060 */ ea = framedata[0]; @@ -1743,12 +2181,26 @@ SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */ # ifdef ALPHA char * addr = get_fault_addr(sc); # else +# if defined(IA64) || defined(HP_PA) + 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 */ + /* worry about earlier kernels on IA64. */ +# else +# if defined(POWERPC) + char * addr = (char *) (sc.regs->dar); +# else --> architecture not supported +# endif +# endif # endif # endif # endif # endif -# if defined(MSWIN32) +# if defined(MACOSX) + char * addr = get_fault_addr(scp); +# endif +# if defined(MSWIN32) || defined(MSWINCE) char * addr = (char *) (exc_info -> ExceptionRecord -> ExceptionInformation[1]); # define sig SIGSEGV @@ -1780,7 +2232,7 @@ SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */ old_handler = GC_old_bus_handler; } if (old_handler == SIG_DFL) { -# ifndef MSWIN32 +# if !defined(MSWIN32) && !defined(MSWINCE) GC_err_printf1("Segfault at 0x%lx\n", addr); ABORT("Unexpected bus error or segmentation fault"); # else @@ -1796,41 +2248,59 @@ SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */ return; # endif # if defined (LINUX) -# ifdef ALPHA +# if defined(ALPHA) || defined(M68K) (*(REAL_SIG_PF)old_handler) (sig, code, sc); # else +# if defined(IA64) || defined(HP_PA) + (*(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) +# 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); - set_pht_entry_from_index(GC_dirty_pages, index); + 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 /* The write may not take place before dirty bits are read. */ /* But then we'll fault again ... */ -# ifdef MSWIN32 +# if defined(MSWIN32) || defined(MSWINCE) return(EXCEPTION_CONTINUE_EXECUTION); # else return; # endif } -#ifdef MSWIN32 +#if defined(MSWIN32) || defined(MSWINCE) return EXCEPTION_CONTINUE_SEARCH; #else GC_err_printf1("Segfault at 0x%lx\n", addr); @@ -1857,7 +2327,7 @@ struct hblk *h; if (!get_pht_entry_from_index(GC_dirty_pages, index)) { found_clean = TRUE; - set_pht_entry_from_index(GC_dirty_pages, index); + async_set_pht_entry_from_index(GC_dirty_pages, index); } } if (found_clean) { @@ -1867,17 +2337,33 @@ struct hblk *h; void GC_dirty_init() { -#if defined(SUNOS5SIGS) || defined(IRIX5) /* || defined(OSF1) */ - struct sigaction act, oldact; -# ifdef IRIX5 +# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(LINUX) || \ + defined(OSF1) || defined(HURD) + struct sigaction act, oldact; + /* We should probably specify SA_SIGINFO for Linux, and handle */ + /* the different architectures more uniformly. */ +# if defined(IRIX5) || defined(LINUX) || defined(OSF1) || defined(HURD) act.sa_flags = SA_RESTART; - act.sa_handler = GC_write_fault_handler; -# else + 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 - (void)sigemptyset(&act.sa_mask); -#endif # ifdef PRINTSTATS GC_printf0("Inititalizing mprotect virtual dirty bit implementation\n"); # endif @@ -1898,7 +2384,7 @@ void GC_dirty_init() # 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!?"); @@ -1910,18 +2396,20 @@ void GC_dirty_init() # endif } # endif -# if defined(SUNOS5SIGS) || defined(IRIX5) -# if defined(IRIX_THREADS) || defined(IRIX_PCR_THREADS) +# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(LINUX) \ + || defined(OSF1) || defined(HURD) + /* SUNOS5SIGS includes HPUX */ +# if defined(IRIX_THREADS) sigaction(SIGSEGV, 0, &oldact); sigaction(SIGSEGV, &act, 0); # else sigaction(SIGSEGV, &act, &oldact); # endif -# if defined(_sigargs) +# if defined(_sigargs) || defined(HURD) /* 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 { @@ -1937,7 +2425,20 @@ void GC_dirty_init() GC_err_printf0("Replaced other SIGSEGV handler\n"); # endif } -# endif +# endif +# if defined(MACOSX) || defined(HPUX) || defined(LINUX) || defined(HURD) + sigaction(SIGBUS, &act, &oldact); + GC_old_bus_handler = oldact.sa_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 /* MACOS || HPUX || LINUX */ # if defined(MSWIN32) GC_old_segv_handler = SetUnhandledExceptionFilter(GC_write_fault_handler); if (GC_old_segv_handler != NULL) { @@ -1990,15 +2491,23 @@ struct hblk * h; * happens to work. * On other systems, SET_LOCK_HOLDER and friends must be suitably defined. */ + +static GC_bool syscall_acquired_lock = FALSE; /* Protected by GC lock. */ void GC_begin_syscall() { - if (!I_HOLD_LOCK()) LOCK(); + if (!I_HOLD_LOCK()) { + LOCK(); + syscall_acquired_lock = TRUE; + } } void GC_end_syscall() { - if (!I_HOLD_LOCK()) UNLOCK(); + if (syscall_acquired_lock) { + syscall_acquired_lock = FALSE; + UNLOCK(); + } } void GC_unprotect_range(addr, len) @@ -2022,18 +2531,20 @@ word len; for (h = start_block; h <= end_block; h++) { register word index = PHT_HASH(h); - set_pht_entry_from_index(GC_dirty_pages, index); + async_set_pht_entry_from_index(GC_dirty_pages, index); } UNPROTECT(start_block, ((ptr_t)end_block - (ptr_t)start_block) + HBLKSIZE); } -#ifndef MSWIN32 +#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 defined(__STDC__) && !defined(SUNOS4) # include <unistd.h> +# include <sys/uio.h> ssize_t read(int fd, void *buf, size_t nbyte) # else # ifndef LINT @@ -2050,10 +2561,12 @@ word len; GC_begin_syscall(); GC_unprotect_range(buf, (word)nbyte); -# ifdef IRIX5 +# if defined(IRIX5) || defined(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. */ + /* On Linux, we have to be careful with the linuxthreads */ + /* read interception. */ { struct iovec iov; @@ -2062,12 +2575,41 @@ word len; result = readv(fd, &iov, 1); } # else - result = syscall(SYS_read, fd, buf, nbyte); +# 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 */ +#endif /* !MSWIN32 && !MSWINCE && !LINUX_THREADS */ + +#ifdef GC_USE_LD_WRAP + /* 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. */ + /* I'm not sure that this actually wraps whatever version of read */ + /* is called by stdio. That code also mentions __read. */ +# include <unistd.h> + ssize_t __wrap_read(int fd, void *buf, size_t nbyte) + { + int result; + + GC_begin_syscall(); + GC_unprotect_range(buf, (word)nbyte); + result = __real_read(fd, buf, nbyte); + GC_end_syscall(); + return(result); + } + + /* We should probably also do this for __read, or whatever stdio */ + /* actually calls. */ +#endif /*ARGSUSED*/ GC_bool GC_page_was_ever_dirty(h) @@ -2084,6 +2626,13 @@ word n; { } +# 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 @@ -2106,7 +2655,6 @@ word n; #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; @@ -2402,29 +2950,56 @@ struct hblk *h; * 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 + +/* I suspect the following works for most X86 *nix variants, so */ +/* 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) + struct frame { + struct frame *fr_savfp; + long fr_savpc; + long fr_arg[NARGS]; /* All the arguments go here. */ + }; +#endif + +#if defined(SPARC) +# if defined(LINUX) + struct frame { + long fr_local[8]; + long fr_arg[6]; + struct frame *fr_savfp; + long fr_savpc; +# ifndef __arch64__ + char *fr_stret; +# endif + long fr_argd[6]; + long fr_argx[0]; + }; +# else +# if defined(SUNOS4) +# include <machine/frame.h> +# else +# if defined (DRSNX) +# include <sys/sparc/frame.h> +# else +# if defined(OPENBSD) || defined(NETBSD) +# include <frame.h> +# else +# include <sys/frame.h> +# endif +# endif +# endif +# endif +# if NARGS > 6 --> We only know how to to get the first 6 arguments -# endif +# endif +#endif /* SPARC */ #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 +#if (defined(OPENBSD) || defined(NETBSD)) && defined(SPARC) # define FR_SAVFP fr_fp # define FR_SAVPC fr_pc #else @@ -2432,30 +3007,95 @@ struct hblk *h; # define FR_SAVPC fr_savpc #endif +#if defined(SPARC) && (defined(__arch64__) || defined(__sparcv9)) +# define BIAS 2047 +#else +# define BIAS 0 +#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(); +# ifdef I386 + /* We assume this is turned on only with gcc as the compiler. */ + asm("movl %%ebp,%0" : "=r"(frame)); + fp = frame; +# else + word GC_save_regs_in_stack(); - frame = (struct frame *) GC_save_regs_in_stack (); + frame = (struct frame *) GC_save_regs_in_stack (); + fp = (struct frame *)((long) frame -> FR_SAVFP + BIAS); +#endif - for (fp = frame -> FR_SAVFP; fp != 0 && nframes < NFRAMES; - fp = fp -> FR_SAVFP, nframes++) { + for (; (!(fp HOTTER_THAN frame) && !(GC_stackbottom HOTTER_THAN (ptr_t)fp) + && (nframes < NFRAMES)); + fp = (struct frame *)((long) fp -> FR_SAVFP + BIAS), 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 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 /* SPARC */ +#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 + + +/* 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; +} +#endif /* LINUX && ... */ + + +#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. */ + +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_err_printf0("---------- End address map ----------\n"); +} + +#endif |