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4315 lines (3809 loc) · 128 KB
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/*
* 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 "private/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) \
&& !defined(MSWINCE)
# include <sys/types.h>
# if !defined(MSWIN32) && !defined(SUNOS4)
# include <unistd.h>
# endif
# endif
# include <stdio.h>
# if defined(MSWINCE)
# define SIGSEGV 0 /* value is irrelevant */
# else
# include <signal.h>
# endif
#if defined(LINUX) || defined(LINUX_STACKBOTTOM)
# include <ctype.h>
#endif
/* Blatantly OS dependent routines, except for those that are related */
/* to dynamic loading. */
# if defined(HEURISTIC2) || defined(SEARCH_FOR_DATA_START)
# define NEED_FIND_LIMIT
# endif
# if !defined(STACKBOTTOM) && defined(HEURISTIC2)
# 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(LINUX) && defined(SPARC))) && !defined(PCR)
# define NEED_FIND_LIMIT
# endif
#if defined(FREEBSD) && (defined(I386) || defined(powerpc) || defined(__powerpc__))
# include <machine/trap.h>
# if !defined(PCR)
# define NEED_FIND_LIMIT
# endif
#endif
#if (defined(NETBSD) || defined(OPENBSD)) && defined(__ELF__) \
&& !defined(NEED_FIND_LIMIT)
/* Used by GC_init_netbsd_elf() below. */
# define NEED_FIND_LIMIT
#endif
#ifdef NEED_FIND_LIMIT
# include <setjmp.h>
#endif
#ifdef AMIGA
# define GC_AMIGA_DEF
# include "AmigaOS.c"
# undef GC_AMIGA_DEF
#endif
#if defined(MSWIN32) || defined(MSWINCE)
# 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
#if defined(USE_MMAP) || defined(USE_MUNMAP)
# ifndef USE_MMAP
--> USE_MUNMAP requires USE_MMAP
# endif
# include <sys/types.h>
# include <sys/mman.h>
# include <sys/stat.h>
# include <errno.h>
#endif
#ifdef UNIX_LIKE
# include <fcntl.h>
# if defined(SUNOS5SIGS) && !defined(FREEBSD)
# include <sys/siginfo.h>
# endif
/* Define SETJMP and friends to be the version that restores */
/* the signal mask. */
# define SETJMP(env) sigsetjmp(env, 1)
# define LONGJMP(env, val) siglongjmp(env, val)
# define JMP_BUF sigjmp_buf
#else
# define SETJMP(env) setjmp(env)
# define LONGJMP(env, val) longjmp(env, val)
# define JMP_BUF jmp_buf
#endif
#ifdef DARWIN
/* for get_etext and friends */
#include <mach-o/getsect.h>
#endif
#ifdef DJGPP
/* Apparently necessary for djgpp 2.01. May cause 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
#include "valgrind.h"
#if !defined(NO_EXECUTE_PERMISSION)
# define OPT_PROT_EXEC PROT_EXEC
#else
# define OPT_PROT_EXEC 0
#endif
#if defined(LINUX) && \
(defined(USE_PROC_FOR_LIBRARIES) || defined(IA64) || !defined(SMALL_CONFIG))
/* We need to parse /proc/self/maps, either to find dynamic libraries, */
/* and/or to find the register backing store base (IA64). Do it once */
/* here. */
#define READ read
/* Repeatedly perform a read call until the buffer is filled or */
/* we encounter EOF. */
ssize_t GC_repeat_read(int fd, char *buf, size_t count)
{
ssize_t num_read = 0;
ssize_t result;
while (num_read < count) {
result = READ(fd, buf + num_read, count - num_read);
if (result < 0) return result;
if (result == 0) break;
num_read += result;
}
return num_read;
}
/*
* Apply fn to a buffer containing the contents of /proc/self/maps.
* Return the result of fn or, if we failed, 0.
* We currently do nothing to /proc/self/maps other than simply read
* it. This code could be simplified if we could determine its size
* ahead of time.
*/
word GC_apply_to_maps(word (*fn)(char *))
{
int f;
int result;
size_t maps_size = 4000; /* Initial guess. */
static char init_buf[1];
static char *maps_buf = init_buf;
static size_t maps_buf_sz = 1;
/* Read /proc/self/maps, growing maps_buf as necessary. */
/* Note that we may not allocate conventionally, and */
/* thus can't use stdio. */
do {
if (maps_size >= maps_buf_sz) {
/* Grow only by powers of 2, since we leak "too small" buffers. */
while (maps_size >= maps_buf_sz) maps_buf_sz *= 2;
maps_buf = GC_scratch_alloc(maps_buf_sz);
if (maps_buf == 0) return 0;
}
f = open("/proc/self/maps", O_RDONLY);
if (-1 == f) return 0;
maps_size = 0;
do {
result = GC_repeat_read(f, maps_buf, maps_buf_sz-1);
if (result <= 0) return 0;
maps_size += result;
} while (result == maps_buf_sz-1);
close(f);
} while (maps_size >= maps_buf_sz);
maps_buf[maps_size] = '\0';
/* Apply fn to result. */
return fn(maps_buf);
}
#endif /* Need GC_apply_to_maps */
#if defined(LINUX) && (defined(USE_PROC_FOR_LIBRARIES) || defined(IA64))
//
// GC_parse_map_entry parses an entry from /proc/self/maps so we can
// locate all writable data segments that belong to shared libraries.
// The format of one of these entries and the fields we care about
// is as follows:
// XXXXXXXX-XXXXXXXX r-xp 00000000 30:05 260537 name of mapping...\n
// ^^^^^^^^ ^^^^^^^^ ^^^^ ^^
// start end prot maj_dev
//
// Note that since about auguat 2003 kernels, the columns no longer have
// fixed offsets on 64-bit kernels. Hence we no longer rely on fixed offsets
// anywhere, which is safer anyway.
//
/*
* Assign various fields of the first line in buf_ptr to *start, *end,
* *prot_buf and *maj_dev. Only *prot_buf may be set for unwritable maps.
*/
char *GC_parse_map_entry(char *buf_ptr, word *start, word *end,
char *prot_buf, unsigned int *maj_dev)
{
char *start_start, *end_start, *prot_start, *maj_dev_start;
char *p;
char *endp;
if (buf_ptr == NULL || *buf_ptr == '\0') {
return NULL;
}
p = buf_ptr;
while (isspace(*p)) ++p;
start_start = p;
GC_ASSERT(isxdigit(*start_start));
*start = strtoul(start_start, &endp, 16); p = endp;
GC_ASSERT(*p=='-');
++p;
end_start = p;
GC_ASSERT(isxdigit(*end_start));
*end = strtoul(end_start, &endp, 16); p = endp;
GC_ASSERT(isspace(*p));
while (isspace(*p)) ++p;
prot_start = p;
GC_ASSERT(*prot_start == 'r' || *prot_start == '-');
memcpy(prot_buf, prot_start, 4);
prot_buf[4] = '\0';
if (prot_buf[1] == 'w') {/* we can skip the rest if it's not writable. */
/* Skip past protection field to offset field */
while (!isspace(*p)) ++p; while (isspace(*p)) ++p;
GC_ASSERT(isxdigit(*p));
/* Skip past offset field, which we ignore */
while (!isspace(*p)) ++p; while (isspace(*p)) ++p;
maj_dev_start = p;
GC_ASSERT(isxdigit(*maj_dev_start));
*maj_dev = strtoul(maj_dev_start, NULL, 16);
}
while (*p && *p++ != '\n');
return p;
}
#endif /* Need to parse /proc/self/maps. */
#if defined(SEARCH_FOR_DATA_START)
/* The I386 case can be handled without a search. The Alpha case */
/* used to be handled differently as well, but the rules changed */
/* for recent Linux versions. This seems to be the easiest way to */
/* cover all versions. */
# ifdef LINUX
/* Some Linux distributions arrange to define __data_start. Some */
/* define data_start as a weak symbol. The latter is technically */
/* broken, since the user program may define data_start, in which */
/* case we lose. Nonetheless, we try both, prefering __data_start. */
/* We assume gcc-compatible pragmas. */
# pragma weak __data_start
extern int __data_start[];
# 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();
# ifdef LINUX
/* Try the easy approaches first: */
if ((ptr_t)__data_start != 0) {
GC_data_start = (ptr_t)(__data_start);
return;
}
if ((ptr_t)data_start != 0) {
GC_data_start = (ptr_t)(data_start);
return;
}
# endif /* LINUX */
GC_data_start = GC_find_limit((ptr_t)(_end), FALSE);
}
#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
#undef SETJMP
#define SETJMP( __env__ ) hal_setjmp( __env__ )
// FIXME: This is a simple way of allocating memory which is
// compatible with ECOS early releases. Later releases use a more
// 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(OPENBSD)) && 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
# 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(MSWINCE) \
&& !defined(MACOS) && !defined(DJGPP) && !defined(DOS4GW) \
&& !defined(NOSYS) && !defined(ECOS)
# if defined(sigmask) && !defined(UTS4) && !defined(HURD)
/* 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)
void GC_disable_signals() { }
void GC_enable_signals() { }
#endif
/* Find the page size */
word GC_page_size;
# if defined(MSWIN32) || defined(MSWINCE)
void GC_setpagesize()
{
GetSystemInfo(&GC_sysinfo);
GC_page_size = GC_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.
*/
# if defined(MSWIN32) || defined(MSWINCE)
# 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);
}
# 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
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));
}
# endif /* OS2 */
# ifdef AMIGA
# define GC_AMIGA_SB
# include "AmigaOS.c"
# undef GC_AMIGA_SB
# endif /* AMIGA */
# if defined(NEED_FIND_LIMIT) || defined(UNIX_LIKE)
# ifdef __STDC__
typedef void (*handler)(int);
# else
typedef void (*handler)();
# endif
# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1) \
|| defined(HURD) || defined(NETBSD)
static struct sigaction old_segv_act;
# if defined(IRIX5) || defined(HPUX) \
|| defined(HURD) || defined(NETBSD)
static struct sigaction old_bus_act;
# endif
# else
static handler old_segv_handler, old_bus_handler;
# endif
# 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) || defined(HURD) || defined(NETBSD)
struct sigaction act;
act.sa_handler = h;
# if 0 /* Was necessary for Solaris 2.3 and very temporary */
/* NetBSD bugs. */
act.sa_flags = SA_RESTART | SA_NODEFER;
# else
act.sa_flags = SA_RESTART;
# endif
(void) sigemptyset(&act.sa_mask);
# ifdef GC_IRIX_THREADS
/* Older versions have a bug related to retrieving and */
/* and setting a handler at the same time. */
(void) sigaction(SIGSEGV, 0, &old_segv_act);
(void) sigaction(SIGSEGV, &act, 0);
(void) sigaction(SIGBUS, 0, &old_bus_act);
(void) sigaction(SIGBUS, &act, 0);
# else
(void) sigaction(SIGSEGV, &act, &old_segv_act);
# if defined(IRIX5) \
|| defined(HPUX) || defined(HURD) || defined(NETBSD)
/* Under Irix 5.x or HP/UX, we may get SIGBUS. */
/* Pthreads doesn't exist under Irix 5.x, so we */
/* don't have to worry in the threads case. */
(void) sigaction(SIGBUS, &act, &old_bus_act);
# endif
# endif /* GC_IRIX_THREADS */
# else
old_segv_handler = signal(SIGSEGV, h);
# ifdef SIGBUS
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) || defined(HURD) || defined(NETBSD)
(void) sigaction(SIGSEGV, &old_segv_act, 0);
# if defined(IRIX5) \
|| defined(HPUX) || defined(HURD) || defined(NETBSD)
(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
}
/* Return the first nonaddressible location > p (up) or */
/* the smallest location q s.t. [q,p) is addressable (!up). */
/* We assume that p (up) or p-1 (!up) is addressable. */
ptr_t GC_find_limit(p, up)
ptr_t p;
GC_bool up;
{
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);
}
# endif
#if defined(ECOS) || defined(NOSYS)
ptr_t GC_get_stack_base()
{
return STACKBOTTOM;
}
#endif
#ifdef HPUX_STACKBOTTOM
#include <sys/param.h>
#include <sys/pstat.h>
ptr_t GC_get_register_stack_base(void)
{
struct pst_vm_status vm_status;
int i = 0;
while (pstat_getprocvm(&vm_status, sizeof(vm_status), 0, i++) == 1) {
if (vm_status.pst_type == PS_RSESTACK) {
return (ptr_t) vm_status.pst_vaddr;
}
}
/* old way to get the register stackbottom */
return (ptr_t)(((word)GC_stackbottom - BACKING_STORE_DISPLACEMENT - 1)
& ~(BACKING_STORE_ALIGNMENT - 1));
}
#endif /* HPUX_STACK_BOTTOM */
#ifdef LINUX_STACKBOTTOM
#include <sys/types.h>
#include <sys/stat.h>
# define STAT_SKIP 27 /* Number of fields preceding startstack */
/* field in /proc/self/stat */
#ifdef USE_LIBC_PRIVATES
# pragma weak __libc_stack_end
extern ptr_t __libc_stack_end;
#endif
# ifdef IA64
/* Try to read the backing store base from /proc/self/maps. */
/* We look for the writable mapping with a 0 major device, */
/* which is as close to our frame as possible, but below it.*/
static word backing_store_base_from_maps(char *maps)
{
char prot_buf[5];
char *buf_ptr = maps;
word start, end;
unsigned int maj_dev;
word current_best = 0;
word dummy;
for (;;) {
buf_ptr = GC_parse_map_entry(buf_ptr, &start, &end, prot_buf, &maj_dev);
if (buf_ptr == NULL) return current_best;
if (prot_buf[1] == 'w' && maj_dev == 0) {
if (end < (word)(&dummy) && start > current_best) current_best = start;
}
}
return current_best;
}
static word backing_store_base_from_proc(void)
{
return GC_apply_to_maps(backing_store_base_from_maps);
}
# ifdef USE_LIBC_PRIVATES
# pragma weak __libc_ia64_register_backing_store_base
extern ptr_t __libc_ia64_register_backing_store_base;
# endif
ptr_t GC_get_register_stack_base(void)
{
# ifdef USE_LIBC_PRIVATES
if (0 != &__libc_ia64_register_backing_store_base
&& 0 != __libc_ia64_register_backing_store_base) {
/* Glibc 2.2.4 has a bug such that for dynamically linked */
/* executables __libc_ia64_register_backing_store_base is */
/* defined but uninitialized during constructor calls. */
/* Hence we check for both nonzero address and value. */
return __libc_ia64_register_backing_store_base;
}
# endif
word result = backing_store_base_from_proc();
if (0 == result) {
/* Use dumb heuristics. Works only for default configuration. */
result = (word)GC_stackbottom - BACKING_STORE_DISPLACEMENT;
result += BACKING_STORE_ALIGNMENT - 1;
result &= ~(BACKING_STORE_ALIGNMENT - 1);
/* Verify that it's at least readable. If not, we goofed. */
GC_noop1(*(word *)result);
}
return (ptr_t)result;
}
# endif
# ifdef GC_LINUX_THREADS
static ptr_t GC_valgrind_get_stack_base(void) {
size_t size;
void *sstart;
pthread_attr_t attr;
if(pthread_getattr_np(pthread_self(), &attr) != 0) {
ABORT("pthread_getattr_np failed");
}
if(pthread_attr_getstack(&attr, &sstart, &size) != 0) {
ABORT("pthread_attr_getstack failed");
}
if(pthread_attr_destroy(&attr) != 0) {
WARN("pthread_attr_destroy failed\n", 0);
}
return (ptr_t) sstart + size;
}
#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
# define STAT_READ read
/* Should probably call the real read, if read is wrapped. */
char stat_buf[STAT_BUF_SIZE];
int f;
char c;
word result = 0;
size_t i, buf_offset = 0;
/* Valgrind modifies the address space of the host process. Thus, the
address given by glibc and the kernel is not valid when running under
valgrind. This alternative function uses pthread attributes to find the
stack base. */
# ifdef GC_LINUX_THREADS
if (RUNNING_ON_VALGRIND) {
return GC_valgrind_get_stack_base();
}
# endif /* GC_LINUX_THREADS */
/* First try the easy way. This should work for glibc 2.2 */
/* This fails in a prelinked ("prelink" command) executable */
/* since the correct value of __libc_stack_end never */
/* becomes visible to us. The second test works around */
/* this. */
# ifdef USE_LIBC_PRIVATES
if (0 != &__libc_stack_end && 0 != __libc_stack_end ) {
# ifdef IA64
/* Some versions of glibc set the address 16 bytes too */
/* low while the initialization code is running. */
if (((word)__libc_stack_end & 0xfff) + 0x10 < 0x1000) {
return __libc_stack_end + 0x10;
} /* Otherwise it's not safe to add 16 bytes and we fall */
/* back to using /proc. */
# else
# ifdef SPARC
/* Older versions of glibc for 64-bit Sparc do not set
* this variable correctly, it gets set to either zero
* or one.
*/
if (__libc_stack_end != (ptr_t) (unsigned long)0x1)
return __libc_stack_end;
# else
return __libc_stack_end;
# endif
# endif
}
# endif
f = open("/proc/self/stat", O_RDONLY);
if (f < 0 || STAT_READ(f, stat_buf, STAT_BUF_SIZE) < 2 * STAT_SKIP) {
ABORT("Couldn't read /proc/self/stat");
}
c = stat_buf[buf_offset++];