+++ /dev/null
-/*-
- * Copyright (c) 1997 Doug Rabson
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $FreeBSD: src/sys/kern/link_aout.c,v 1.26 1999/12/24 15:33:36 bde Exp $
- * $DragonFly: src/sys/kern/link_aout.c,v 1.24 2008/02/06 22:37:46 nth Exp $
- */
-
-#define FREEBSD_AOUT 1
-
-#include <sys/param.h>
-#include <sys/kernel.h>
-#include <sys/systm.h>
-#include <sys/types.h>
-#include <sys/malloc.h>
-#include <sys/proc.h>
-#include <sys/nlookup.h>
-#include <sys/fcntl.h>
-#include <sys/vnode.h>
-#include <sys/linker.h>
-
-#include <vm/vm_zone.h>
-
-#ifndef __ELF__
-#include <vm/vm.h>
-#include <vm/pmap.h>
-#include <machine/vmparam.h>
-#endif
-
-#include <machine/exec.h>
-#include <sys/imgact_aout.h>
-#include <machine/reloc.h>
-#define _AOUT_INCLUDE_
-#include <sys/nlist_aout.h>
-#include <sys/link_aout.h>
-
-static int link_aout_load_module(const char*, linker_file_t*,int);
-
-static int link_aout_load_file(const char*, linker_file_t*,int);
-
-static int link_aout_lookup_symbol(linker_file_t, const char*,
- c_linker_sym_t*);
-static int link_aout_symbol_values(linker_file_t file, c_linker_sym_t sym,
- linker_symval_t* symval);
-static int link_aout_search_symbol(linker_file_t lf, caddr_t value,
- c_linker_sym_t* sym, long* diffp);
-static void link_aout_unload_file(linker_file_t);
-static void link_aout_unload_module(linker_file_t);
-static int link_aout_lookup_set(linker_file_t lf, const char *name,
- void ***startp, void ***stopp, int *countp);
-
-static struct linker_class_ops link_aout_class_ops = {
- link_aout_load_module,
-};
-
-static struct linker_file_ops link_aout_file_ops = {
- link_aout_lookup_symbol,
- link_aout_symbol_values,
- link_aout_search_symbol,
- link_aout_unload_file,
- link_aout_lookup_set
-};
-static struct linker_file_ops link_aout_module_ops = {
- link_aout_lookup_symbol,
- link_aout_symbol_values,
- link_aout_search_symbol,
- link_aout_unload_module,
- link_aout_lookup_set
-};
-
-typedef struct aout_file {
- char* address; /* Load address */
- struct _dynamic* dynamic; /* Symbol table etc. */
-} *aout_file_t;
-
-static int load_dependancies(linker_file_t lf, int load_flags);
-static int relocate_file(linker_file_t lf);
-
-/*
- * The kernel symbol table starts here.
- */
-extern struct _dynamic _DYNAMIC;
-
-static void
-link_aout_init(void* arg)
-{
-#ifndef __ELF__
- struct _dynamic* dp = &_DYNAMIC;
-#endif
-
- linker_add_class("a.out", NULL, &link_aout_class_ops);
-
-#ifndef __ELF__
- if (dp) {
- aout_file_t af;
-
- af = kmalloc(sizeof(struct aout_file), M_LINKER, M_NOWAIT | M_ZERO);
- if (af == NULL)
- panic("link_aout_init: Can't create linker structures for kernel");
-
- af->address = 0;
- af->dynamic = dp;
- linker_kernel_file =
- linker_make_file(kernelname, af, &link_aout_file_ops);
- if (linker_kernel_file == NULL)
- panic("link_aout_init: Can't create linker structures for kernel");
- linker_kernel_file->address = (caddr_t) KERNBASE;
- linker_kernel_file->size = -(long)linker_kernel_file->address;
- linker_current_file = linker_kernel_file;
- linker_kernel_file->flags |= LINKER_FILE_LINKED;
- }
-#endif
-}
-
-SYSINIT(link_aout, SI_BOOT2_KLD, SI_ORDER_THIRD, link_aout_init, 0);
-
-static int
-link_aout_load_module(const char *filename, linker_file_t *result,
- int load_flags)
-{
- caddr_t modptr, baseptr;
- char *type;
- struct exec *ehdr;
- aout_file_t af;
- linker_file_t lf;
- int error;
-
- /* Look to see if we have the module preloaded. */
- if ((modptr = preload_search_by_name(filename)) == NULL)
- return(link_aout_load_file(filename, result, load_flags));
-
- /* It's preloaded, check we can handle it and collect information. */
- if (((type = (char *)preload_search_info(modptr, MODINFO_TYPE)) == NULL) ||
- strcmp(type, "a.out module") ||
- ((baseptr = preload_search_info(modptr, MODINFO_ADDR)) == NULL) ||
- ((ehdr = (struct exec *)preload_search_info(modptr, MODINFO_METADATA | MODINFOMD_AOUTEXEC)) == NULL))
- return(0); /* we can't handle this */
-
- /* Looks like we can handle this one */
- af = kmalloc(sizeof(struct aout_file), M_LINKER, M_WAITOK | M_ZERO);
- af->address = baseptr;
-
- /* Assume _DYNAMIC is the first data item. */
- af->dynamic = (struct _dynamic*)(af->address + ehdr->a_text);
- if (af->dynamic->d_version != LD_VERSION_BSD) {
- kfree(af, M_LINKER);
- return(0); /* we can't handle this */
- }
- af->dynamic->d_un.d_sdt = (struct section_dispatch_table *)
- ((char *)af->dynamic->d_un.d_sdt + (vm_offset_t)af->address);
-
- /* Register with kld */
- lf = linker_make_file(filename, af, &link_aout_module_ops);
- if (lf == NULL) {
- kfree(af, M_LINKER);
- return(ENOMEM);
- }
- lf->address = af->address;
- lf->size = ehdr->a_text + ehdr->a_data + ehdr->a_bss;
-
- /* Try to load dependancies */
- if (((error = load_dependancies(lf, load_flags)) != 0) ||
- ((error = relocate_file(lf)) != 0)) {
- linker_file_unload(lf);
- return(error);
- }
- lf->flags |= LINKER_FILE_LINKED;
- *result = lf;
- return(0);
-}
-
-static int
-link_aout_load_file(const char *filename, linker_file_t *result, int load_flags)
-{
- struct nlookupdata nd;
- struct thread *td = curthread;
- struct proc *p = td->td_proc;
- struct vnode *vp;
- int error = 0;
- int resid;
- struct exec header;
- aout_file_t af;
- linker_file_t lf;
- char *pathname;
-
- KKASSERT(p != NULL);
-
- if (p->p_ucred == NULL) {
- kprintf("link_aout_load_file: cannot load '%s' from filesystem"
- " this early\n", filename);
- return ENOENT;
- }
-
- pathname = linker_search_path(filename);
- if (pathname == NULL)
- return ENOENT;
- error = nlookup_init(&nd, pathname, UIO_SYSSPACE, NLC_FOLLOW|NLC_LOCKVP);
- if (error == 0)
- error = vn_open(&nd, NULL, FREAD, 0);
- kfree(pathname, M_LINKER);
- if (error) {
- nlookup_done(&nd);
- return error;
- }
- vp = nd.nl_open_vp;
- nd.nl_open_vp = NULL;
- nlookup_done(&nd);
-
- /*
- * Read the a.out header from the file.
- */
- error = vn_rdwr(UIO_READ, vp, (void*) &header, sizeof header, 0,
- UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
- if (error)
- goto out;
-
- if (N_BADMAG(header) || !(N_GETFLAG(header) & EX_DYNAMIC))
- goto out;
-
- /*
- * We have an a.out file, so make some space to read it in.
- */
- af = kmalloc(sizeof(struct aout_file), M_LINKER, M_WAITOK | M_ZERO);
- af->address = kmalloc(header.a_text + header.a_data + header.a_bss,
- M_LINKER, M_WAITOK);
-
- /*
- * Read the text and data sections and zero the bss.
- */
- error = vn_rdwr(UIO_READ, vp, (void*) af->address,
- header.a_text + header.a_data, 0,
- UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
- if (error)
- goto out;
- bzero(af->address + header.a_text + header.a_data, header.a_bss);
-
- /*
- * Assume _DYNAMIC is the first data item.
- */
- af->dynamic = (struct _dynamic*) (af->address + header.a_text);
- if (af->dynamic->d_version != LD_VERSION_BSD) {
- kfree(af->address, M_LINKER);
- kfree(af, M_LINKER);
- goto out;
- }
- af->dynamic->d_un.d_sdt = (struct section_dispatch_table *)
- ((char *)af->dynamic->d_un.d_sdt + (vm_offset_t)af->address);
-
- lf = linker_make_file(filename, af, &link_aout_file_ops);
- if (lf == NULL) {
- kfree(af->address, M_LINKER);
- kfree(af, M_LINKER);
- error = ENOMEM;
- goto out;
- }
- lf->address = af->address;
- lf->size = header.a_text + header.a_data + header.a_bss;
-
- if ((error = load_dependancies(lf, load_flags)) != 0
- || (error = relocate_file(lf)) != 0) {
- linker_file_unload(lf);
- goto out;
- }
-
- lf->flags |= LINKER_FILE_LINKED;
- *result = lf;
-
-out:
- vn_unlock(vp);
- vn_close(vp, FREAD);
-
- return error;
-}
-
-static void
-link_aout_unload_file(linker_file_t file)
-{
- aout_file_t af = file->priv;
-
- if (af) {
- if (af->address)
- kfree(af->address, M_LINKER);
- kfree(af, M_LINKER);
- }
-}
-
-static void
-link_aout_unload_module(linker_file_t file)
-{
- aout_file_t af = file->priv;
-
- if (af)
- kfree(af, M_LINKER);
- if (file->filename)
- preload_delete_name(file->filename);
-}
-
-#define AOUT_RELOC(af, type, off) (type*) ((af)->address + (off))
-
-static int
-load_dependancies(linker_file_t lf, int load_flags)
-{
- aout_file_t af = lf->priv;
- linker_file_t lfdep;
- long off;
- struct sod* sodp;
- char* name;
- char* filename = 0;
- int error = 0;
-
- /*
- * All files are dependant on /kernel.
- */
- if (linker_kernel_file) {
- linker_kernel_file->refs++;
- linker_file_add_dependancy(lf, linker_kernel_file);
- }
-
- off = LD_NEED(af->dynamic);
-
- /*
- * Load the dependancies.
- */
- while (off != 0) {
- sodp = AOUT_RELOC(af, struct sod, off);
- name = AOUT_RELOC(af, char, sodp->sod_name);
-
- error = linker_load_file(name, &lfdep, load_flags);
- if (error)
- goto out;
- linker_file_add_dependancy(lf, lfdep);
- off = sodp->sod_next;
- }
-
-out:
- if (filename)
- kfree(filename, M_TEMP);
- return error;
-}
-
-/*
- * XXX i386 dependant.
- */
-static long
-read_relocation(struct relocation_info* r, char* addr)
-{
- int length = r->r_length;
- if (length == 0)
- return *(u_char*) addr;
- else if (length == 1)
- return *(u_short*) addr;
- else if (length == 2)
- return *(u_int*) addr;
- else
- kprintf("link_aout: unsupported relocation size %d\n", r->r_length);
- return 0;
-}
-
-static void
-write_relocation(struct relocation_info* r, char* addr, long value)
-{
- int length = r->r_length;
- if (length == 0)
- *(u_char*) addr = value;
- else if (length == 1)
- *(u_short*) addr = value;
- else if (length == 2)
- *(u_int*) addr = value;
- else
- kprintf("link_aout: unsupported relocation size %d\n", r->r_length);
-}
-
-static int
-relocate_file(linker_file_t lf)
-{
- aout_file_t af = lf->priv;
- struct relocation_info* rel;
- struct relocation_info* erel;
- struct relocation_info* r;
- struct nzlist* symbolbase;
- char* stringbase;
- struct nzlist* np;
- char* sym;
- long relocation;
-
- rel = AOUT_RELOC(af, struct relocation_info, LD_REL(af->dynamic));
- erel = AOUT_RELOC(af, struct relocation_info,
- LD_REL(af->dynamic) + LD_RELSZ(af->dynamic));
- symbolbase = AOUT_RELOC(af, struct nzlist, LD_SYMBOL(af->dynamic));
- stringbase = AOUT_RELOC(af, char, LD_STRINGS(af->dynamic));
-
- for (r = rel; r < erel; r++) {
- char* addr;
-
- if (r->r_address == 0)
- break;
-
- addr = AOUT_RELOC(af, char, r->r_address);
- if (r->r_extern) {
- np = &symbolbase[r->r_symbolnum];
- sym = &stringbase[np->nz_strx];
-
- if (sym[0] != '_') {
- kprintf("link_aout: bad symbol name %s\n", sym);
- kprintf("link_aout: symbol %s not found\n", sym);
- return ENOENT;
- } else {
- if (linker_file_lookup_symbol(lf, sym + 1,
- (np->nz_type != (N_SETV+N_EXT)), (caddr_t *)&relocation)) {
- kprintf("link_aout: symbol %s not found\n", sym);
- return ENOENT;
- }
- }
-
- relocation += read_relocation(r, addr);
-
- if (r->r_jmptable) {
- kprintf("link_aout: can't cope with jump table relocations\n");
- continue;
- }
-
- if (r->r_pcrel)
- relocation -= (intptr_t) af->address;
-
- if (r->r_copy) {
- kprintf("link_aout: can't cope with copy relocations\n");
- continue;
- }
-
- write_relocation(r, addr, relocation);
- } else {
- write_relocation(r, addr,
- (intptr_t)(read_relocation(r, addr) + af->address));
- }
-
- }
-
- return 0;
-}
-
-static long
-symbol_hash_value(aout_file_t af, const char* name)
-{
- long hashval;
- const char* p;
-
- hashval = '_'; /* fake a starting '_' for C symbols */
- for (p = name; *p; p++)
- hashval = (hashval << 1) + *p;
-
- return (hashval & 0x7fffffff) % LD_BUCKETS(af->dynamic);
-}
-
-int
-link_aout_lookup_symbol(linker_file_t file, const char* name,
- c_linker_sym_t* sym)
-{
- aout_file_t af = file->priv;
- long hashval;
- struct rrs_hash* hashbase;
- struct nzlist* symbolbase;
- char* stringbase;
- struct rrs_hash* hp;
- struct nzlist* np;
- char* cp;
-
- if (LD_BUCKETS(af->dynamic) == 0)
- return 0;
-
- hashbase = AOUT_RELOC(af, struct rrs_hash, LD_HASH(af->dynamic));
- symbolbase = AOUT_RELOC(af, struct nzlist, LD_SYMBOL(af->dynamic));
- stringbase = AOUT_RELOC(af, char, LD_STRINGS(af->dynamic));
-
-restart:
- hashval = symbol_hash_value(af, name);
- hp = &hashbase[hashval];
- if (hp->rh_symbolnum == -1)
- return ENOENT;
-
- while (hp) {
- np = (struct nzlist *) &symbolbase[hp->rh_symbolnum];
- cp = stringbase + np->nz_strx;
- /*
- * Note: we fake the leading '_' for C symbols.
- */
- if (cp[0] == '_' && !strcmp(cp + 1, name))
- break;
-
- if (hp->rh_next == 0)
- hp = NULL;
- else
- hp = &hashbase[hp->rh_next];
- }
-
- if (hp == NULL)
- /*
- * Not found.
- */
- return ENOENT;
-
- /*
- * Check for an aliased symbol, whatever that is.
- */
- if (np->nz_type == N_INDR+N_EXT) {
- name = stringbase + (++np)->nz_strx + 1; /* +1 for '_' */
- goto restart;
- }
-
- /*
- * Check this is an actual definition of the symbol.
- */
- if (np->nz_value == 0)
- return ENOENT;
-
- if (np->nz_type == N_UNDF+N_EXT && np->nz_value != 0) {
- if (np->nz_other == AUX_FUNC)
- /* weak function */
- return ENOENT;
- }
-
- *sym = (linker_sym_t) np;
-
- return 0;
-}
-
-
-static int
-link_aout_symbol_values(linker_file_t file, c_linker_sym_t sym,
- linker_symval_t* symval)
-{
- aout_file_t af = file->priv;
- const struct nzlist* np = (const struct nzlist*) sym;
- char* stringbase;
- long numsym = LD_STABSZ(af->dynamic) / sizeof(struct nzlist);
- struct nzlist *symbase;
-
- /* Is it one of ours? It could be another module... */
- symbase = AOUT_RELOC(af, struct nzlist, LD_SYMBOL(af->dynamic));
- if (np < symbase)
- return ENOENT;
- if ((np - symbase) > numsym)
- return ENOENT;
-
- stringbase = AOUT_RELOC(af, char, LD_STRINGS(af->dynamic));
-
- symval->name = stringbase + np->nz_strx + 1; /* +1 for '_' */
- if (np->nz_type == N_UNDF+N_EXT && np->nz_value != 0) {
- symval->value = 0;
- symval->size = np->nz_value;
- } else {
- symval->value = AOUT_RELOC(af, char, np->nz_value);
- symval->size = np->nz_size;
- }
- return 0;
-}
-
-static int
-link_aout_search_symbol(linker_file_t lf, caddr_t value,
- c_linker_sym_t* sym, long* diffp)
-{
- aout_file_t af = lf->priv;
- u_long off = (uintptr_t) (void *) value;
- u_long diff = off;
- u_long sp_nz_value;
- struct nzlist* sp;
- struct nzlist* ep;
- struct nzlist* best = 0;
-
- for (sp = AOUT_RELOC(af, struct nzlist, LD_SYMBOL(af->dynamic)),
- ep = (struct nzlist *) ((caddr_t) sp + LD_STABSZ(af->dynamic));
- sp < ep; sp++) {
- if (sp->nz_name == 0)
- continue;
- sp_nz_value = sp->nz_value + (uintptr_t) (void *) af->address;
- if (off >= sp_nz_value) {
- if (off - sp_nz_value < diff) {
- diff = off - sp_nz_value;
- best = sp;
- if (diff == 0)
- break;
- } else if (off - sp_nz_value == diff) {
- best = sp;
- }
- }
- }
- if (best == 0)
- *diffp = off;
- else
- *diffp = diff;
- *sym = (linker_sym_t) best;
-
- return 0;
-}
-
-/*
- * Look up a linker set on an a.out + gnu LD system.
- */
-
-struct generic_linker_set {
- int ls_length;
- void *ls_items[1];
-};
-
-static int
-link_aout_lookup_set(linker_file_t lf, const char *name,
- void ***startp, void ***stopp, int *countp)
-{
- c_linker_sym_t sym;
- linker_symval_t symval;
- void **start, **stop;
- int error, count;
- struct generic_linker_set *setp;
-
- error = link_aout_lookup_symbol(lf, name, &sym);
- if (error)
- return error;
- link_aout_symbol_values(lf, sym, &symval);
- if (symval.value == 0)
- return ESRCH;
- setp = (struct generic_linker_set *)symval.value;
- count = setp->ls_length;
- start = &setp->ls_items[0];
- stop = &setp->ls_items[count];
- if (startp)
- *startp = start;
- if (stopp)
- *stopp = stop;
- if (countp)
- *countp = count;
- return 0;
-}
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