--- /dev/null
+/*-
+ * Copyright (c) 1998 Doug Rabson
+ * Copyright (c) 2004 Peter Wemm
+ * 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_elf.c,v 1.24 1999/12/24 15:33:36 bde Exp $
+ * $DragonFly: src/sys/kern/link_elf.c,v 1.29 2008/08/01 23:11:16 dillon Exp $
+ */
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/systm.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 <machine/elf.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/vm_zone.h>
+#include <vm/vm_object.h>
+#include <vm/vm_kern.h>
+#include <vm/vm_extern.h>
+#include <sys/lock.h>
+#include <vm/pmap.h>
+#include <vm/vm_map.h>
+
+static int link_elf_obj_preload_file(const char *, linker_file_t *);
+static int link_elf_obj_preload_finish(linker_file_t);
+static int link_elf_obj_load_file(const char *, linker_file_t *);
+static int
+link_elf_obj_lookup_symbol(linker_file_t, const char *,
+ c_linker_sym_t *);
+static int link_elf_obj_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t *);
+static int
+link_elf_obj_search_symbol(linker_file_t, caddr_t value,
+ c_linker_sym_t * sym, long *diffp);
+
+static void link_elf_obj_unload_file(linker_file_t);
+static int
+link_elf_obj_lookup_set(linker_file_t, const char *,
+ void ***, void ***, int *);
+static void link_elf_obj_reloc_local(linker_file_t lf);
+static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *);
+
+static struct linker_class_ops link_elf_obj_class_ops = {
+ link_elf_obj_load_file,
+ link_elf_obj_preload_file,
+};
+
+static struct linker_file_ops link_elf_obj_file_ops = {
+ .lookup_symbol = link_elf_obj_lookup_symbol,
+ .symbol_values = link_elf_obj_symbol_values,
+ .search_symbol = link_elf_obj_search_symbol,
+ .preload_finish = link_elf_obj_preload_finish,
+ .unload = link_elf_obj_unload_file,
+ .lookup_set = link_elf_obj_lookup_set,
+};
+
+typedef struct {
+ void *addr;
+ Elf_Off size;
+ int flags;
+ int sec; /* Original section */
+ char *name;
+} Elf_progent;
+
+typedef struct {
+ Elf_Rel *rel;
+ int nrel;
+ int sec;
+} Elf_relent;
+
+typedef struct {
+ Elf_Rela *rela;
+ int nrela;
+ int sec;
+} Elf_relaent;
+
+
+typedef struct elf_file {
+ int preloaded;
+
+ caddr_t address; /* Relocation address */
+ vm_object_t object; /* VM object to hold file pages */
+ Elf_Shdr *e_shdr;
+
+ Elf_progent *progtab;
+ int nprogtab;
+
+ Elf_relaent *relatab;
+ int nrelatab;
+
+ Elf_relent *reltab;
+ int nreltab;
+
+ Elf_Sym *ddbsymtab; /* The symbol table we are using */
+ long ddbsymcnt; /* Number of symbols */
+ caddr_t ddbstrtab; /* String table */
+ long ddbstrcnt; /* number of bytes in string table */
+
+ caddr_t shstrtab; /* Section name string table */
+ long shstrcnt; /* number of bytes in string table */
+
+ caddr_t ctftab; /* CTF table */
+ long ctfcnt; /* number of bytes in CTF table */
+ caddr_t ctfoff; /* CTF offset table */
+ caddr_t typoff; /* Type offset table */
+ long typlen; /* Number of type entries. */
+
+} *elf_file_t;
+
+static int relocate_file(linker_file_t lf);
+
+/*
+ * The kernel symbol table starts here.
+ */
+extern struct _dynamic _DYNAMIC;
+
+static void
+link_elf_obj_init(void *arg)
+{
+#if ELF_TARG_CLASS == ELFCLASS32
+ linker_add_class("elf32", NULL, &link_elf_obj_class_ops);
+#else
+ linker_add_class("elf64", NULL, &link_elf_obj_class_ops);
+#endif
+}
+
+SYSINIT(link_elf, SI_BOOT2_KLD, SI_ORDER_SECOND, link_elf_obj_init, 0);
+
+static void
+link_elf_obj_error(const char *file, const char *s)
+{
+ kprintf("kldload: %s: %s\n", file, s);
+}
+
+static int
+link_elf_obj_preload_file(const char *filename, linker_file_t *result)
+{
+ Elf_Ehdr *hdr;
+ Elf_Shdr *shdr;
+ Elf_Sym *es;
+ caddr_t modptr, baseptr, sizeptr;
+ char *type;
+ elf_file_t ef;
+ linker_file_t lf;
+ Elf_Addr off;
+ int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
+
+ /*
+ * Look to see if we have the module preloaded.
+ */
+ modptr = preload_search_by_name(filename);
+ if (modptr == NULL)
+ return ENOENT;
+
+ /* It's preloaded, check we can handle it and collect information */
+ type = (char *)preload_search_info(modptr, MODINFO_TYPE);
+ baseptr = preload_search_info(modptr, MODINFO_ADDR);
+ sizeptr = preload_search_info(modptr, MODINFO_SIZE);
+ hdr = (Elf_Ehdr *) preload_search_info(modptr, MODINFO_METADATA |
+ MODINFOMD_ELFHDR);
+ shdr = (Elf_Shdr *) preload_search_info(modptr, MODINFO_METADATA |
+ MODINFOMD_SHDR);
+ if (type == NULL ||
+ (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " obj module") != 0 &&
+ strcmp(type, "elf obj module") != 0)) {
+ return (EFTYPE);
+ }
+ if (baseptr == NULL || sizeptr == NULL || hdr == NULL || shdr == NULL)
+ return (EINVAL);
+
+ ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
+ ef->preloaded = 1;
+ ef->address = *(caddr_t *) baseptr;
+ lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
+ if (lf == NULL) {
+ kfree(ef, M_LINKER);
+ return ENOMEM;
+ }
+ lf->address = ef->address;
+ lf->size = *(size_t *) sizeptr;
+
+ if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
+ hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
+ hdr->e_ident[EI_VERSION] != EV_CURRENT ||
+ hdr->e_version != EV_CURRENT ||
+ hdr->e_type != ET_REL ||
+ hdr->e_machine != ELF_TARG_MACH) {
+ error = EFTYPE;
+ goto out;
+ }
+ ef->e_shdr = shdr;
+
+ /* Scan the section header for information and table sizing. */
+ symtabindex = -1;
+ symstrindex = -1;
+ for (i = 0; i < hdr->e_shnum; i++) {
+ switch (shdr[i].sh_type) {
+ case SHT_PROGBITS:
+ case SHT_NOBITS:
+ ef->nprogtab++;
+ break;
+ case SHT_SYMTAB:
+ symtabindex = i;
+ symstrindex = shdr[i].sh_link;
+ break;
+ case SHT_REL:
+ ef->nreltab++;
+ break;
+ case SHT_RELA:
+ ef->nrelatab++;
+ break;
+ }
+ }
+
+ shstrindex = hdr->e_shstrndx;
+ if (ef->nprogtab == 0 || symstrindex < 0 ||
+ symstrindex >= hdr->e_shnum ||
+ shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
+ shstrindex >= hdr->e_shnum ||
+ shdr[shstrindex].sh_type != SHT_STRTAB) {
+ error = ENOEXEC;
+ goto out;
+ }
+ /* Allocate space for tracking the load chunks */
+ if (ef->nprogtab != 0)
+ ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
+ M_LINKER, M_WAITOK | M_ZERO);
+ if (ef->nreltab != 0)
+ ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
+ M_LINKER, M_WAITOK | M_ZERO);
+ if (ef->nrelatab != 0)
+ ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
+ M_LINKER, M_WAITOK | M_ZERO);
+ if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
+ (ef->nreltab != 0 && ef->reltab == NULL) ||
+ (ef->nrelatab != 0 && ef->relatab == NULL)) {
+ error = ENOMEM;
+ goto out;
+ }
+ /* XXX, relocate the sh_addr fields saved by the loader. */
+ off = 0;
+ for (i = 0; i < hdr->e_shnum; i++) {
+ if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
+ off = shdr[i].sh_addr;
+ }
+ for (i = 0; i < hdr->e_shnum; i++) {
+ if (shdr[i].sh_addr != 0)
+ shdr[i].sh_addr = shdr[i].sh_addr - off +
+ (Elf_Addr) ef->address;
+ }
+
+ ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
+ ef->ddbsymtab = (Elf_Sym *) shdr[symtabindex].sh_addr;
+ ef->ddbstrcnt = shdr[symstrindex].sh_size;
+ ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
+ ef->shstrcnt = shdr[shstrindex].sh_size;
+ ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
+
+ /* Now fill out progtab and the relocation tables. */
+ pb = 0;
+ rl = 0;
+ ra = 0;
+ for (i = 0; i < hdr->e_shnum; i++) {
+ switch (shdr[i].sh_type) {
+ case SHT_PROGBITS:
+ case SHT_NOBITS:
+ ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
+ if (shdr[i].sh_type == SHT_PROGBITS)
+ ef->progtab[pb].name = "<<PROGBITS>>";
+ else
+ ef->progtab[pb].name = "<<NOBITS>>";
+ ef->progtab[pb].size = shdr[i].sh_size;
+ ef->progtab[pb].sec = i;
+ if (ef->shstrtab && shdr[i].sh_name != 0)
+ ef->progtab[pb].name =
+ ef->shstrtab + shdr[i].sh_name;
+#if 0
+ if (ef->progtab[pb].name != NULL &&
+ !strcmp(ef->progtab[pb].name, "set_pcpu")) {
+ void *dpcpu;
+
+ dpcpu = dpcpu_alloc(shdr[i].sh_size);
+ if (dpcpu == NULL) {
+ error = ENOSPC;
+ goto out;
+ }
+ memcpy(dpcpu, ef->progtab[pb].addr,
+ ef->progtab[pb].size);
+ dpcpu_copy(dpcpu, shdr[i].sh_size);
+ ef->progtab[pb].addr = dpcpu;
+#ifdef VIMAGE
+ } else if (ef->progtab[pb].name != NULL &&
+ !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
+ void *vnet_data;
+
+ vnet_data = vnet_data_alloc(shdr[i].sh_size);
+ if (vnet_data == NULL) {
+ error = ENOSPC;
+ goto out;
+ }
+ memcpy(vnet_data, ef->progtab[pb].addr,
+ ef->progtab[pb].size);
+ vnet_data_copy(vnet_data, shdr[i].sh_size);
+ ef->progtab[pb].addr = vnet_data;
+#endif
+ }
+#endif
+ /* Update all symbol values with the offset. */
+ for (j = 0; j < ef->ddbsymcnt; j++) {
+ es = &ef->ddbsymtab[j];
+ if (es->st_shndx != i)
+ continue;
+ es->st_value += (Elf_Addr) ef->progtab[pb].addr;
+ }
+ pb++;
+ break;
+ case SHT_REL:
+ ef->reltab[rl].rel = (Elf_Rel *) shdr[i].sh_addr;
+ ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
+ ef->reltab[rl].sec = shdr[i].sh_info;
+ rl++;
+ break;
+ case SHT_RELA:
+ ef->relatab[ra].rela = (Elf_Rela *) shdr[i].sh_addr;
+ ef->relatab[ra].nrela =
+ shdr[i].sh_size / sizeof(Elf_Rela);
+ ef->relatab[ra].sec = shdr[i].sh_info;
+ ra++;
+ break;
+ }
+ }
+ if (pb != ef->nprogtab)
+ panic("lost progbits");
+ if (rl != ef->nreltab)
+ panic("lost reltab");
+ if (ra != ef->nrelatab)
+ panic("lost relatab");
+
+ /* Local intra-module relocations */
+ link_elf_obj_reloc_local(lf);
+
+ *result = lf;
+ return (0);
+
+out:
+ /* preload not done this way */
+ linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ );
+ return (error);
+}
+
+static int
+link_elf_obj_preload_finish(linker_file_t lf)
+{
+ int error;
+
+ error = relocate_file(lf);
+
+ return (error);
+}
+
+static int
+link_elf_obj_load_file(const char *filename, linker_file_t * result)
+{
+ struct nlookupdata nd;
+ struct thread *td = curthread; /* XXX */
+ struct proc *p = td->td_proc;
+ char *pathname;
+ struct vnode *vp;
+ Elf_Ehdr *hdr;
+ Elf_Shdr *shdr;
+ Elf_Sym *es;
+ int nbytes, i, j;
+ vm_offset_t mapbase;
+ size_t mapsize;
+ int error = 0;
+ int resid;
+ elf_file_t ef;
+ linker_file_t lf;
+ int symtabindex;
+ int symstrindex;
+ int shstrindex;
+ int nsym;
+ int pb, rl, ra;
+ int alignmask;
+
+ KKASSERT(p != NULL);
+ if (p->p_ucred == NULL) {
+ kprintf("link_elf_obj_load_file: cannot load '%s' from filesystem"
+ " this early\n", filename);
+ return ENOENT;
+ }
+ shdr = NULL;
+ lf = NULL;
+ mapsize = 0;
+ hdr = NULL;
+ 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 elf header from the file.
+ */
+ hdr = kmalloc(sizeof(*hdr), M_LINKER, M_WAITOK);
+ if (hdr == NULL) {
+ error = ENOMEM;
+ goto out;
+ }
+ error = vn_rdwr(UIO_READ, vp, (void *)hdr, sizeof(*hdr), 0,
+ UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
+ if (error)
+ goto out;
+ if (resid != 0) {
+ error = ENOEXEC;
+ goto out;
+ }
+ if (!IS_ELF(*hdr)) {
+ error = ENOEXEC;
+ goto out;
+ }
+
+ if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
+ || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
+ link_elf_obj_error(filename, "Unsupported file layout");
+ error = ENOEXEC;
+ goto out;
+ }
+ if (hdr->e_ident[EI_VERSION] != EV_CURRENT
+ || hdr->e_version != EV_CURRENT) {
+ link_elf_obj_error(filename, "Unsupported file version");
+ error = ENOEXEC;
+ goto out;
+ }
+ if (hdr->e_type != ET_REL) {
+ error = ENOSYS;
+ goto out;
+ }
+ if (hdr->e_machine != ELF_TARG_MACH) {
+ link_elf_obj_error(filename, "Unsupported machine");
+ error = ENOEXEC;
+ goto out;
+ }
+
+ ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
+ lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
+ if (lf == NULL) {
+ kfree(ef, M_LINKER);
+ error = ENOMEM;
+ goto out;
+ }
+ ef->nprogtab = 0;
+ ef->e_shdr = 0;
+ ef->nreltab = 0;
+ ef->nrelatab = 0;
+
+ /* Allocate and read in the section header */
+ nbytes = hdr->e_shnum * hdr->e_shentsize;
+ if (nbytes == 0 || hdr->e_shoff == 0 ||
+ hdr->e_shentsize != sizeof(Elf_Shdr)) {
+ error = ENOEXEC;
+ goto out;
+ }
+ shdr = kmalloc(nbytes, M_LINKER, M_WAITOK);
+ if (shdr == NULL) {
+ error = ENOMEM;
+ goto out;
+ }
+ ef->e_shdr = shdr;
+ error = vn_rdwr(UIO_READ, vp, (caddr_t) shdr, nbytes, hdr->e_shoff,
+ UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
+ if (error)
+ goto out;
+ if (resid) {
+ error = ENOEXEC;
+ goto out;
+ }
+ /* Scan the section header for information and table sizing. */
+ nsym = 0;
+ symtabindex = -1;
+ symstrindex = -1;
+ for (i = 0; i < hdr->e_shnum; i++) {
+ switch (shdr[i].sh_type) {
+ case SHT_PROGBITS:
+ case SHT_NOBITS:
+ ef->nprogtab++;
+ break;
+ case SHT_SYMTAB:
+ nsym++;
+ symtabindex = i;
+ symstrindex = shdr[i].sh_link;
+ break;
+ case SHT_REL:
+ ef->nreltab++;
+ break;
+ case SHT_RELA:
+ ef->nrelatab++;
+ break;
+ case SHT_STRTAB:
+ break;
+ }
+ }
+ if (ef->nprogtab == 0) {
+ link_elf_obj_error(filename, "file has no contents");
+ error = ENOEXEC;
+ goto out;
+ }
+ if (nsym != 1) {
+ /* Only allow one symbol table for now */
+ link_elf_obj_error(filename, "file has no valid symbol table");
+ error = ENOEXEC;
+ goto out;
+ }
+ if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
+ shdr[symstrindex].sh_type != SHT_STRTAB) {
+ link_elf_obj_error(filename, "file has invalid symbol strings");
+ error = ENOEXEC;
+ goto out;
+ }
+ /* Allocate space for tracking the load chunks */
+ if (ef->nprogtab != 0)
+ ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
+ M_LINKER, M_WAITOK | M_ZERO);
+ if (ef->nreltab != 0)
+ ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
+ M_LINKER, M_WAITOK | M_ZERO);
+ if (ef->nrelatab != 0)
+ ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
+ M_LINKER, M_WAITOK | M_ZERO);
+ if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
+ (ef->nreltab != 0 && ef->reltab == NULL) ||
+ (ef->nrelatab != 0 && ef->relatab == NULL)) {
+ error = ENOMEM;
+ goto out;
+ }
+ if (symtabindex == -1)
+ panic("lost symbol table index");
+ /* Allocate space for and load the symbol table */
+ ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
+ ef->ddbsymtab = kmalloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
+ if (ef->ddbsymtab == NULL) {
+ error = ENOMEM;
+ goto out;
+ }
+ error = vn_rdwr(UIO_READ, vp, (void *)ef->ddbsymtab,
+ shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
+ UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
+ if (error)
+ goto out;
+ if (resid != 0) {
+ error = EINVAL;
+ goto out;
+ }
+ if (symstrindex == -1)
+ panic("lost symbol string index");
+ /* Allocate space for and load the symbol strings */
+ ef->ddbstrcnt = shdr[symstrindex].sh_size;
+ ef->ddbstrtab = kmalloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
+ if (ef->ddbstrtab == NULL) {
+ error = ENOMEM;
+ goto out;
+ }
+ error = vn_rdwr(UIO_READ, vp, ef->ddbstrtab,
+ shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
+ UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
+ if (error)
+ goto out;
+ if (resid != 0) {
+ error = EINVAL;
+ goto out;
+ }
+ /* Do we have a string table for the section names? */
+ shstrindex = -1;
+ if (hdr->e_shstrndx != 0 &&
+ shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
+ shstrindex = hdr->e_shstrndx;
+ ef->shstrcnt = shdr[shstrindex].sh_size;
+ ef->shstrtab = kmalloc(shdr[shstrindex].sh_size, M_LINKER,
+ M_WAITOK);
+ if (ef->shstrtab == NULL) {
+ error = ENOMEM;
+ goto out;
+ }
+ error = vn_rdwr(UIO_READ, vp, ef->shstrtab,
+ shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
+ UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
+ if (error)
+ goto out;
+ if (resid != 0) {
+ error = EINVAL;
+ goto out;
+ }
+ }
+ /* Size up code/data(progbits) and bss(nobits). */
+ alignmask = 0;
+ for (i = 0; i < hdr->e_shnum; i++) {
+ switch (shdr[i].sh_type) {
+ case SHT_PROGBITS:
+ case SHT_NOBITS:
+ alignmask = shdr[i].sh_addralign - 1;
+ mapsize += alignmask;
+ mapsize &= ~alignmask;
+ mapsize += shdr[i].sh_size;
+ break;
+ }
+ }
+
+ /*
+ * We know how much space we need for the text/data/bss/etc. This
+ * stuff needs to be in a single chunk so that profiling etc can get
+ * the bounds and gdb can associate offsets with modules
+ */
+ ef->object = vm_object_allocate(OBJT_DEFAULT,
+ round_page(mapsize) >> PAGE_SHIFT);
+ if (ef->object == NULL) {
+ error = ENOMEM;
+ goto out;
+ }
+ ef->address = (caddr_t) vm_map_min(&kernel_map);
+
+ /*
+ * In order to satisfy amd64's architectural requirements on the
+ * location of code and data in the kernel's address space, request a
+ * mapping that is above the kernel.
+ */
+ mapbase = KERNBASE;
+ error = vm_map_find(&kernel_map, ef->object, 0, &mapbase,
+ round_page(mapsize), TRUE, VM_MAPTYPE_NORMAL,
+ VM_PROT_ALL, VM_PROT_ALL, FALSE);
+ if (error) {
+ vm_object_deallocate(ef->object);
+ ef->object = 0;
+ goto out;
+ }
+ /* Wire the pages */
+ error = vm_map_wire(&kernel_map, mapbase,
+ mapbase + round_page(mapsize), 0);
+ if (error != KERN_SUCCESS) {
+ error = ENOMEM;
+ goto out;
+ }
+ /* Inform the kld system about the situation */
+ lf->address = ef->address = (caddr_t) mapbase;
+ lf->size = mapsize;
+
+ /*
+ * Now load code/data(progbits), zero bss(nobits), allocate space for
+ * and load relocs
+ */
+ pb = 0;
+ rl = 0;
+ ra = 0;
+ alignmask = 0;
+ for (i = 0; i < hdr->e_shnum; i++) {
+ switch (shdr[i].sh_type) {
+ case SHT_PROGBITS:
+ case SHT_NOBITS:
+ alignmask = shdr[i].sh_addralign - 1;
+ mapbase += alignmask;
+ mapbase &= ~alignmask;
+ if (ef->shstrtab && shdr[i].sh_name != 0)
+ ef->progtab[pb].name =
+ ef->shstrtab + shdr[i].sh_name;
+ else if (shdr[i].sh_type == SHT_PROGBITS)
+ ef->progtab[pb].name = "<<PROGBITS>>";
+ else
+ ef->progtab[pb].name = "<<NOBITS>>";
+#if 0
+ if (ef->progtab[pb].name != NULL &&
+ !strcmp(ef->progtab[pb].name, "set_pcpu"))
+ ef->progtab[pb].addr =
+ dpcpu_alloc(shdr[i].sh_size);
+#ifdef VIMAGE
+ else if (ef->progtab[pb].name != NULL &&
+ !strcmp(ef->progtab[pb].name, VNET_SETNAME))
+ ef->progtab[pb].addr =
+ vnet_data_alloc(shdr[i].sh_size);
+#endif
+ else
+#endif
+ ef->progtab[pb].addr =
+ (void *)(uintptr_t) mapbase;
+ if (ef->progtab[pb].addr == NULL) {
+ error = ENOSPC;
+ goto out;
+ }
+ ef->progtab[pb].size = shdr[i].sh_size;
+ ef->progtab[pb].sec = i;
+ if (shdr[i].sh_type == SHT_PROGBITS) {
+ error = vn_rdwr(UIO_READ, vp,
+ ef->progtab[pb].addr,
+ shdr[i].sh_size, shdr[i].sh_offset,
+ UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
+ &resid);
+ if (error)
+ goto out;
+ if (resid != 0) {
+ error = EINVAL;
+ goto out;
+ }
+#if 0
+ /* Initialize the per-cpu or vnet area. */
+ if (ef->progtab[pb].addr != (void *)mapbase &&
+ !strcmp(ef->progtab[pb].name, "set_pcpu"))
+ dpcpu_copy(ef->progtab[pb].addr,
+ shdr[i].sh_size);
+#ifdef VIMAGE
+ else if (ef->progtab[pb].addr !=
+ (void *)mapbase &&
+ !strcmp(ef->progtab[pb].name, VNET_SETNAME))
+ vnet_data_copy(ef->progtab[pb].addr,
+ shdr[i].sh_size);
+#endif
+#endif
+ } else
+ bzero(ef->progtab[pb].addr, shdr[i].sh_size);
+
+ /* Update all symbol values with the offset. */
+ for (j = 0; j < ef->ddbsymcnt; j++) {
+ es = &ef->ddbsymtab[j];
+ if (es->st_shndx != i)
+ continue;
+ es->st_value += (Elf_Addr) ef->progtab[pb].addr;
+ }
+ mapbase += shdr[i].sh_size;
+ pb++;
+ break;
+ case SHT_REL:
+ ef->reltab[rl].rel = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
+ ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
+ ef->reltab[rl].sec = shdr[i].sh_info;
+ error = vn_rdwr(UIO_READ, vp,
+ (void *)ef->reltab[rl].rel,
+ shdr[i].sh_size, shdr[i].sh_offset,
+ UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
+ if (error)
+ goto out;
+ if (resid != 0) {
+ error = EINVAL;
+ goto out;
+ }
+ rl++;
+ break;
+ case SHT_RELA:
+ ef->relatab[ra].rela = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
+ ef->relatab[ra].nrela = shdr[i].sh_size / sizeof(Elf_Rela);
+ ef->relatab[ra].sec = shdr[i].sh_info;
+ error = vn_rdwr(UIO_READ, vp,
+ (void *)ef->relatab[ra].rela,
+ shdr[i].sh_size, shdr[i].sh_offset,
+ UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
+ if (error)
+ goto out;
+ if (resid != 0) {
+ error = EINVAL;
+ goto out;
+ }
+ ra++;
+ break;
+ }
+ }
+ if (pb != ef->nprogtab)
+ panic("lost progbits");
+ if (rl != ef->nreltab)
+ panic("lost reltab");
+ if (ra != ef->nrelatab)
+ panic("lost relatab");
+ if (mapbase != (vm_offset_t) ef->address + mapsize)
+ panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
+ mapbase, ef->address, mapsize,
+ (vm_offset_t) ef->address + mapsize);
+
+ /* Local intra-module relocations */
+ link_elf_obj_reloc_local(lf);
+
+ /* Pull in dependencies */
+ error = linker_load_dependencies(lf);
+ if (error)
+ goto out;
+
+ /* External relocations */
+ error = relocate_file(lf);
+ if (error)
+ goto out;
+
+ *result = lf;
+
+out:
+ if (error && lf)
+ linker_file_unload(lf /*, LINKER_UNLOAD_FORCE */);
+ if (hdr)
+ kfree(hdr, M_LINKER);
+ vn_unlock(vp);
+ vn_close(vp, FREAD);
+
+ return error;
+}
+
+static void
+link_elf_obj_unload_file(linker_file_t file)
+{
+ elf_file_t ef = file->priv;
+ int i;
+
+ if (ef->progtab) {
+ for (i = 0; i < ef->nprogtab; i++) {
+ if (ef->progtab[i].size == 0)
+ continue;
+ if (ef->progtab[i].name == NULL)
+ continue;
+#if 0
+ if (!strcmp(ef->progtab[i].name, "set_pcpu"))
+ dpcpu_free(ef->progtab[i].addr,
+ ef->progtab[i].size);
+#ifdef VIMAGE
+ else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
+ vnet_data_free(ef->progtab[i].addr,
+ ef->progtab[i].size);
+#endif
+#endif
+ }
+ }
+ if (ef->preloaded) {
+ if (ef->reltab)
+ kfree(ef->reltab, M_LINKER);
+ if (ef->relatab)
+ kfree(ef->relatab, M_LINKER);
+ if (ef->progtab)
+ kfree(ef->progtab, M_LINKER);
+ if (ef->ctftab)
+ kfree(ef->ctftab, M_LINKER);
+ if (ef->ctfoff)
+ kfree(ef->ctfoff, M_LINKER);
+ if (ef->typoff)
+ kfree(ef->typoff, M_LINKER);
+ if (file->filename != NULL)
+ preload_delete_name(file->filename);
+ kfree(ef, M_LINKER);
+ /* XXX reclaim module memory? */
+ return;
+ }
+
+ for (i = 0; i < ef->nreltab; i++)
+ if (ef->reltab[i].rel)
+ kfree(ef->reltab[i].rel, M_LINKER);
+ for (i = 0; i < ef->nrelatab; i++)
+ if (ef->relatab[i].rela)
+ kfree(ef->relatab[i].rela, M_LINKER);
+ if (ef->reltab)
+ kfree(ef->reltab, M_LINKER);
+ if (ef->relatab)
+ kfree(ef->relatab, M_LINKER);
+ if (ef->progtab)
+ kfree(ef->progtab, M_LINKER);
+
+ if (ef->object) {
+ vm_map_remove(&kernel_map, (vm_offset_t) ef->address,
+ (vm_offset_t) ef->address +
+ (ef->object->size << PAGE_SHIFT));
+ }
+ if (ef->e_shdr)
+ kfree(ef->e_shdr, M_LINKER);
+ if (ef->ddbsymtab)
+ kfree(ef->ddbsymtab, M_LINKER);
+ if (ef->ddbstrtab)
+ kfree(ef->ddbstrtab, M_LINKER);
+ if (ef->shstrtab)
+ kfree(ef->shstrtab, M_LINKER);
+ if (ef->ctftab)
+ kfree(ef->ctftab, M_LINKER);
+ if (ef->ctfoff)
+ kfree(ef->ctfoff, M_LINKER);
+ if (ef->typoff)
+ kfree(ef->typoff, M_LINKER);
+ kfree(ef, M_LINKER);
+}
+
+static const char *
+symbol_name(elf_file_t ef, Elf_Size r_info)
+{
+ const Elf_Sym *ref;
+
+ if (ELF_R_SYM(r_info)) {
+ ref = ef->ddbsymtab + ELF_R_SYM(r_info);
+ return ef->ddbstrtab + ref->st_name;
+ } else
+ return NULL;
+}
+
+static Elf_Addr
+findbase(elf_file_t ef, int sec)
+{
+ int i;
+ Elf_Addr base = 0;
+
+ for (i = 0; i < ef->nprogtab; i++) {
+ if (sec == ef->progtab[i].sec) {
+ base = (Elf_Addr)ef->progtab[i].addr;
+ break;
+ }
+ }
+ return base;
+}
+
+static int
+relocate_file(linker_file_t lf)
+{
+ elf_file_t ef = lf->priv;
+ const Elf_Rel *rellim;
+ const Elf_Rel *rel;
+ const Elf_Rela *relalim;
+ const Elf_Rela *rela;
+ const char *symname;
+ const Elf_Sym *sym;
+ int i;
+ Elf_Size symidx;
+ Elf_Addr base;
+
+ /* Perform relocations without addend if there are any: */
+ for (i = 0; i < ef->nreltab; i++) {
+ rel = ef->reltab[i].rel;
+ if (rel == NULL)
+ panic("lost a reltab!");
+ rellim = rel + ef->reltab[i].nrel;
+ base = findbase(ef, ef->reltab[i].sec);
+ if (base == 0)
+ panic("lost base for reltab");
+ for ( ; rel < rellim; rel++) {
+ symidx = ELF_R_SYM(rel->r_info);
+ if (symidx >= ef->ddbsymcnt)
+ continue;
+ sym = ef->ddbsymtab + symidx;
+ /* Local relocs are already done */
+ if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
+ continue;
+ if (elf_reloc(lf, base, rel, ELF_RELOC_REL,
+ elf_obj_lookup)) {
+ symname = symbol_name(ef, rel->r_info);
+ kprintf("link_elf_obj_obj: symbol %s undefined\n",
+ symname);
+ return ENOENT;
+ }
+ }
+ }
+
+ /* Perform relocations with addend if there are any: */
+ for (i = 0; i < ef->nrelatab; i++) {
+ rela = ef->relatab[i].rela;
+ if (rela == NULL)
+ panic("lost a relatab!");
+ relalim = rela + ef->relatab[i].nrela;
+ base = findbase(ef, ef->relatab[i].sec);
+ if (base == 0)
+ panic("lost base for relatab");
+ for ( ; rela < relalim; rela++) {
+ symidx = ELF_R_SYM(rela->r_info);
+ if (symidx >= ef->ddbsymcnt)
+ continue;
+ sym = ef->ddbsymtab + symidx;
+ /* Local relocs are already done */
+ if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
+ continue;
+ if (elf_reloc(lf, base, rela, ELF_RELOC_RELA,
+ elf_obj_lookup)) {
+ symname = symbol_name(ef, rela->r_info);
+ kprintf("link_elf_obj_obj: symbol %s undefined\n",
+ symname);
+ return ENOENT;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int
+link_elf_obj_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
+{
+ elf_file_t ef = lf->priv;
+ const Elf_Sym *symp;
+ const char *strp;
+ int i;
+
+ for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
+ strp = ef->ddbstrtab + symp->st_name;
+ if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
+ *sym = (c_linker_sym_t) symp;
+ return 0;
+ }
+ }
+ return ENOENT;
+}
+
+static int
+link_elf_obj_symbol_values(linker_file_t lf, c_linker_sym_t sym,
+ linker_symval_t *symval)
+{
+ elf_file_t ef = lf->priv;
+ const Elf_Sym *es = (const Elf_Sym*) sym;
+
+ if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
+ symval->name = ef->ddbstrtab + es->st_name;
+ symval->value = (caddr_t)es->st_value;
+ symval->size = es->st_size;
+ return 0;
+ }
+ return ENOENT;
+}
+
+static int
+link_elf_obj_search_symbol(linker_file_t lf, caddr_t value,
+ c_linker_sym_t *sym, long *diffp)
+{
+ elf_file_t ef = lf->priv;
+ u_long off = (uintptr_t) (void *) value;
+ u_long diff = off;
+ u_long st_value;
+ const Elf_Sym *es;
+ const Elf_Sym *best = 0;
+ int i;
+
+ for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
+ if (es->st_name == 0)
+ continue;
+ st_value = es->st_value;
+ if (off >= st_value) {
+ if (off - st_value < diff) {
+ diff = off - st_value;
+ best = es;
+ if (diff == 0)
+ break;
+ } else if (off - st_value == diff) {
+ best = es;
+ }
+ }
+ }
+ if (best == 0)
+ *diffp = off;
+ else
+ *diffp = diff;
+ *sym = (c_linker_sym_t) best;
+
+ return 0;
+}
+
+/*
+ * Look up a linker set on an ELF system.
+ */
+static int
+link_elf_obj_lookup_set(linker_file_t lf, const char *name,
+ void ***startp, void ***stopp, int *countp)
+{
+ elf_file_t ef = lf->priv;
+ void **start, **stop;
+ int i, count;
+
+ /* Relative to section number */
+ for (i = 0; i < ef->nprogtab; i++) {
+ if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
+ strcmp(ef->progtab[i].name + 4, name) == 0) {
+ start = (void **)ef->progtab[i].addr;
+ stop = (void **)((char *)ef->progtab[i].addr +
+ ef->progtab[i].size);
+ count = stop - start;
+ if (startp)
+ *startp = start;
+ if (stopp)
+ *stopp = stop;
+ if (countp)
+ *countp = count;
+ return (0);
+ }
+ }
+ return (ESRCH);
+}
+
+/*
+ * Symbol lookup function that can be used when the symbol index is known (ie
+ * in relocations). It uses the symbol index instead of doing a fully fledged
+ * hash table based lookup when such is valid. For example for local symbols.
+ * This is not only more efficient, it's also more correct. It's not always
+ * the case that the symbol can be found through the hash table.
+ */
+static int
+elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *result)
+{
+ elf_file_t ef = lf->priv;
+ const Elf_Sym *sym;
+ const char *symbol;
+
+ /* Don't even try to lookup the symbol if the index is bogus. */
+ if (symidx >= ef->ddbsymcnt)
+ return (ENOENT);
+
+ sym = ef->ddbsymtab + symidx;
+
+ /* Quick answer if there is a definition included. */
+ if (sym->st_shndx != SHN_UNDEF) {
+ *result = sym->st_value;
+ return (0);
+ }
+
+ /* If we get here, then it is undefined and needs a lookup. */
+ switch (ELF_ST_BIND(sym->st_info)) {
+ case STB_LOCAL:
+ /* Local, but undefined? huh? */
+ return (ENOENT);
+
+ case STB_GLOBAL:
+ /* Relative to Data or Function name */
+ symbol = ef->ddbstrtab + sym->st_name;
+
+ /* Force a lookup failure if the symbol name is bogus. */
+ if (*symbol == 0)
+ return (ENOENT);
+ return (linker_file_lookup_symbol(lf, symbol, deps, (caddr_t *)result));
+
+ case STB_WEAK:
+ kprintf("link_elf_obj_obj: Weak symbols not supported\n");
+ return (ENOENT);
+
+ default:
+ return (ENOENT);
+ }
+}
+
+static void
+link_elf_obj_fix_link_set(elf_file_t ef)
+{
+ static const char startn[] = "__start_";
+ static const char stopn[] = "__stop_";
+ Elf_Sym *sym;
+ const char *sym_name, *linkset_name;
+ Elf_Addr startp, stopp;
+ Elf_Size symidx;
+ int start, i;
+
+ startp = stopp = 0;
+ for (symidx = 1 /* zero entry is special */;
+ symidx < ef->ddbsymcnt; symidx++) {
+ sym = ef->ddbsymtab + symidx;
+ if (sym->st_shndx != SHN_UNDEF)
+ continue;
+
+ sym_name = ef->ddbstrtab + sym->st_name;
+ if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
+ start = 1;
+ linkset_name = sym_name + sizeof(startn) - 1;
+ }
+ else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
+ start = 0;
+ linkset_name = sym_name + sizeof(stopn) - 1;
+ }
+ else
+ continue;
+
+ for (i = 0; i < ef->nprogtab; i++) {
+ if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
+ startp = (Elf_Addr)ef->progtab[i].addr;
+ stopp = (Elf_Addr)(startp + ef->progtab[i].size);
+ break;
+ }
+ }
+ if (i == ef->nprogtab)
+ continue;
+
+ sym->st_value = start ? startp : stopp;
+ sym->st_shndx = i;
+ }
+}
+
+static void
+link_elf_obj_reloc_local(linker_file_t lf)
+{
+ elf_file_t ef = lf->priv;
+ const Elf_Rel *rellim;
+ const Elf_Rel *rel;
+ const Elf_Rela *relalim;
+ const Elf_Rela *rela;
+ const Elf_Sym *sym;
+ Elf_Addr base;
+ int i;
+ Elf_Size symidx;
+
+ link_elf_obj_fix_link_set(ef);
+
+ /* Perform relocations without addend if there are any: */
+ for (i = 0; i < ef->nreltab; i++) {
+ rel = ef->reltab[i].rel;
+ if (rel == NULL)
+ panic("lost a reltab!");
+ rellim = rel + ef->reltab[i].nrel;
+ base = findbase(ef, ef->reltab[i].sec);
+ if (base == 0)
+ panic("lost base for reltab");
+ for ( ; rel < rellim; rel++) {
+ symidx = ELF_R_SYM(rel->r_info);
+ if (symidx >= ef->ddbsymcnt)
+ continue;
+ sym = ef->ddbsymtab + symidx;
+ /* Only do local relocs */
+ if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
+ continue;
+ elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
+ elf_obj_lookup);
+ }
+ }
+
+ /* Perform relocations with addend if there are any: */
+ for (i = 0; i < ef->nrelatab; i++) {
+ rela = ef->relatab[i].rela;
+ if (rela == NULL)
+ panic("lost a relatab!");
+ relalim = rela + ef->relatab[i].nrela;
+ base = findbase(ef, ef->relatab[i].sec);
+ if (base == 0)
+ panic("lost base for relatab");
+ for ( ; rela < relalim; rela++) {
+ symidx = ELF_R_SYM(rela->r_info);
+ if (symidx >= ef->ddbsymcnt)
+ continue;
+ sym = ef->ddbsymtab + symidx;
+ /* Only do local relocs */
+ if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
+ continue;
+ elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
+ elf_obj_lookup);
+ }
+ }
+}
polachok's projects / dragonfly.git / commitdiff