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/*
* Copyright (c) 1991-1993 by Xerox Corporation. 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 copy this garbage collector for any purpose,
* provided the above notices are retained on all copies.
* Author: Bill Janssen
* Modified by: Hans Boehm
*/
/*
* This is incredibly OS specific code for tracking down data sections in
* dynamic libraries. There appears to be no way of doing this quickly
* without groveling through undocumented data structures. We would argue
* that this is a bug in the design of the dlopen interface. THIS CODE
* MAY BREAK IN FUTURE OS RELEASES. If this matters to you, don't hesitate
* to let your vendor know ...
*/
#include "gc_private.h"
#ifdef DYNAMIC_LOADING
#if !(defined(M68K) && defined(SUNOS)) && !defined(SPARC)
--> We only know how to find data segments of dynamic libraries under SunOS 4.X
#endif
#include <stdio.h>
#if defined SUNOS5
# include <sys/elf.h>
# include <dlfcn.h>
# include <link.h>
#else
# include <dlfcn.h>
# include <link.h>
# include <a.out.h>
/* struct link_map field overrides */
# define l_next lm_next
# define l_addr lm_addr
# define l_name lm_name
# endif
#ifdef SUNOS5
#ifdef LINT
Elf32_Dyn _DYNAMIC;
#endif
static struct link_map *
GC_FirstDLOpenedLinkMap()
{
extern Elf32_Dyn _DYNAMIC;
Elf32_Dyn *dp;
struct r_debug *r;
static struct link_map * cachedResult = 0;
if( &_DYNAMIC == 0) {
return(0);
}
if( cachedResult == 0 ) {
int tag;
for( dp = ((Elf32_Dyn *)(&_DYNAMIC)); (tag = dp->d_tag) != 0; dp++ ) {
if( tag == DT_DEBUG ) {
struct link_map *lm
= ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
if( lm != 0 ) cachedResult = lm->l_next; /* might be NIL */
break;
}
}
}
return cachedResult;
}
# endif
# ifdef SUNOS4
#ifdef LINT
struct link_dynamic _DYNAMIC;
#endif
static struct link_map *
GC_FirstDLOpenedLinkMap()
{
extern struct link_dynamic _DYNAMIC;
if( &_DYNAMIC == 0) {
return(0);
}
return(_DYNAMIC.ld_un.ld_1->ld_loaded);
}
/* Return the address of the ld.so allocated common symbol */
/* with the least address, or 0 if none. */
static ptr_t GC_first_common()
{
ptr_t result = 0;
extern struct link_dynamic _DYNAMIC;
struct rtc_symb * curr_symbol;
if( &_DYNAMIC == 0) {
return(0);
}
curr_symbol = _DYNAMIC.ldd -> ldd_cp;
for (; curr_symbol != 0; curr_symbol = curr_symbol -> rtc_next) {
if (result == 0
|| (ptr_t)(curr_symbol -> rtc_sp -> n_value) < result) {
result = (ptr_t)(curr_symbol -> rtc_sp -> n_value);
}
}
return(result);
}
# endif
/* Add dynamic library data sections to the root set. */
# if !defined(PCR) && defined(THREADS)
# ifndef SRC_M3
--> fix mutual exclusion with dlopen
# endif /* We assume M3 programs don't call dlopen for now */
# endif
void GC_register_dynamic_libraries()
{
struct link_map *lm = GC_FirstDLOpenedLinkMap();
for (lm = GC_FirstDLOpenedLinkMap();
lm != (struct link_map *) 0; lm = lm->l_next)
{
# ifdef SUNOS4
struct exec *e;
e = (struct exec *) lm->lm_addr;
GC_add_roots_inner(
((char *) (N_DATOFF(*e) + lm->lm_addr)),
((char *) (N_BSSADDR(*e) + e->a_bss + lm->lm_addr)));
# endif
# ifdef SUNOS5
Elf32_Ehdr * e;
Elf32_Phdr * p;
unsigned long offset;
char * start;
register int i;
e = (Elf32_Ehdr *) lm->l_addr;
p = ((Elf32_Phdr *)(((char *)(e)) + e->e_phoff));
offset = ((unsigned long)(lm->l_addr));
for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) {
switch( p->p_type ) {
case PT_LOAD:
{
if( !(p->p_flags & PF_W) ) break;
start = ((char *)(p->p_vaddr)) + offset;
GC_add_roots_inner(
start,
start + p->p_memsz
);
}
break;
default:
break;
}
}
# endif
}
# ifdef SUNOS4
{
static ptr_t common_start = 0;
ptr_t common_end;
extern ptr_t GC_find_limit();
if (common_start == 0) common_start = GC_first_common();
if (common_start != 0) {
common_end = GC_find_limit(common_start, TRUE);
GC_add_roots_inner((char *)common_start, (char *)common_end);
}
}
# endif
}
#else
void GC_register_dynamic_libraries(){}
int GC_no_dynamic_loading;
#endif
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