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sys/kern/link_elf.c
Show All 23 Lines | |||||
* SUCH DAMAGE. | * SUCH DAMAGE. | ||||
*/ | */ | ||||
#include <sys/cdefs.h> | #include <sys/cdefs.h> | ||||
__FBSDID("$FreeBSD$"); | __FBSDID("$FreeBSD$"); | ||||
#include "opt_ddb.h" | #include "opt_ddb.h" | ||||
#include "opt_gdb.h" | #include "opt_gdb.h" | ||||
#include "opt_kldgzelf.h" | |||||
#include <sys/types.h> | |||||
#include <sys/param.h> | #include <sys/param.h> | ||||
#include <sys/systm.h> | #include <sys/systm.h> | ||||
#ifdef GPROF | #ifdef GPROF | ||||
#include <sys/gmon.h> | #include <sys/gmon.h> | ||||
#endif | #endif | ||||
#include <sys/kernel.h> | #include <sys/kernel.h> | ||||
#include <sys/lock.h> | #include <sys/lock.h> | ||||
#include <sys/malloc.h> | #include <sys/malloc.h> | ||||
Show All 18 Lines | |||||
#include <vm/vm_object.h> | #include <vm/vm_object.h> | ||||
#include <vm/vm_kern.h> | #include <vm/vm_kern.h> | ||||
#include <vm/vm_extern.h> | #include <vm/vm_extern.h> | ||||
#endif | #endif | ||||
#include <vm/pmap.h> | #include <vm/pmap.h> | ||||
#include <vm/vm_map.h> | #include <vm/vm_map.h> | ||||
#include <sys/link_elf.h> | #include <sys/link_elf.h> | ||||
#include <sys/stat.h> | |||||
#ifdef DDB_CTF | #if defined(DDB_CTF) || defined(KLDGZELF) | ||||
#include <net/zlib.h> | #include <net/zlib.h> | ||||
#endif | #endif | ||||
#include "linker_if.h" | #include "linker_if.h" | ||||
#define MAXSEGS 4 | #define MAXSEGS 4 | ||||
typedef struct elf_file { | typedef struct elf_file { | ||||
▲ Show 20 Lines • Show All 92 Lines • ▼ Show 20 Lines | static kobj_method_t link_elf_methods[] = { | ||||
KOBJMETHOD(linker_link_preload, link_elf_link_preload), | KOBJMETHOD(linker_link_preload, link_elf_link_preload), | ||||
KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish), | KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish), | ||||
KOBJMETHOD(linker_lookup_set, link_elf_lookup_set), | KOBJMETHOD(linker_lookup_set, link_elf_lookup_set), | ||||
KOBJMETHOD(linker_each_function_name, link_elf_each_function_name), | KOBJMETHOD(linker_each_function_name, link_elf_each_function_name), | ||||
KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval), | KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval), | ||||
KOBJMETHOD(linker_ctf_get, link_elf_ctf_get), | KOBJMETHOD(linker_ctf_get, link_elf_ctf_get), | ||||
KOBJMETHOD(linker_symtab_get, link_elf_symtab_get), | KOBJMETHOD(linker_symtab_get, link_elf_symtab_get), | ||||
KOBJMETHOD(linker_strtab_get, link_elf_strtab_get), | KOBJMETHOD(linker_strtab_get, link_elf_strtab_get), | ||||
{ 0, 0 } | KOBJMETHOD_END | ||||
}; | }; | ||||
static struct linker_class link_elf_class = { | static struct linker_class link_elf_class = { | ||||
#if ELF_TARG_CLASS == ELFCLASS32 | #if ELF_TARG_CLASS == ELFCLASS32 | ||||
"elf32", | "elf32", | ||||
#else | #else | ||||
"elf64", | "elf64", | ||||
#endif | #endif | ||||
link_elf_methods, sizeof(struct elf_file) | link_elf_methods, sizeof(struct elf_file) | ||||
}; | }; | ||||
#ifdef KLDGZELF | |||||
#define GZ_ID1 31 | |||||
#define GZ_ID2 139 | |||||
/* Default ocmpression */ | |||||
#define GZ_CM 8 | |||||
/* Header flags */ | |||||
#define GZ_FLG_FTEXT 1 | |||||
#define GZ_FLG_FHCRC 2 | |||||
#define GZ_FLG_FEXTRA 4 | |||||
#define GZ_FLG_FNAME 8 | |||||
#define GZ_FLG_FCOMMENT 16 | |||||
#define GZ_EXTRA_F_SIZE_SIZE 2 | |||||
#define GZ_INFLATED_SIZE_SIZE 4 | |||||
static int link_gzelf_link_preload(linker_class_t, | |||||
const char *, linker_file_t *); | |||||
static int link_gzelf_link_preload_finish(linker_file_t); | |||||
static int link_gzelf_load_file(linker_class_t, const char *, | |||||
linker_file_t *); | |||||
static kobj_method_t link_gzelf_methods[] = { | |||||
KOBJMETHOD(linker_load_file, link_gzelf_load_file), | |||||
KOBJMETHOD(linker_link_preload, link_gzelf_link_preload), | |||||
KOBJMETHOD(linker_link_preload_finish, link_gzelf_link_preload_finish), | |||||
KOBJMETHOD_END | |||||
}; | |||||
static kobj_class_t link_gzelf_baseclasses[] = { | |||||
(kobj_class_t)&link_elf_class, NULL | |||||
}; | |||||
static struct linker_class link_gzelf_class = { | |||||
#if ELF_TARG_CLASS == ELFCLASS32 | |||||
"gzelf32", | |||||
#else | |||||
"gzelf64", | |||||
#endif | |||||
link_gzelf_methods, sizeof(struct elf_file), link_gzelf_baseclasses | |||||
}; | |||||
static int | |||||
link_gzelf_link_preload(linker_class_t cls, | |||||
const char* filename, linker_file_t *result) | |||||
{ | |||||
return ENOENT; | |||||
} | |||||
static int | |||||
link_gzelf_link_preload_finish(linker_file_t lf) | |||||
{ | |||||
return ENOENT; | |||||
} | |||||
#endif | |||||
static int parse_dynamic(elf_file_t); | static int parse_dynamic(elf_file_t); | ||||
static int relocate_file(elf_file_t); | static int relocate_file(elf_file_t); | ||||
static int link_elf_preload_parse_symbols(elf_file_t); | static int link_elf_preload_parse_symbols(elf_file_t); | ||||
static struct elf_set_head set_pcpu_list; | static struct elf_set_head set_pcpu_list; | ||||
#ifdef VIMAGE | #ifdef VIMAGE | ||||
static struct elf_set_head set_vnet_list; | static struct elf_set_head set_vnet_list; | ||||
#endif | #endif | ||||
▲ Show 20 Lines • Show All 174 Lines • ▼ Show 20 Lines | |||||
link_elf_init(void* arg) | link_elf_init(void* arg) | ||||
{ | { | ||||
Elf_Dyn *dp; | Elf_Dyn *dp; | ||||
caddr_t modptr, baseptr, sizeptr; | caddr_t modptr, baseptr, sizeptr; | ||||
elf_file_t ef; | elf_file_t ef; | ||||
char *modname; | char *modname; | ||||
linker_add_class(&link_elf_class); | linker_add_class(&link_elf_class); | ||||
#ifdef KLDGZELF | |||||
linker_add_class(&link_gzelf_class); | |||||
#endif | |||||
dp = (Elf_Dyn *)&_DYNAMIC; | dp = (Elf_Dyn *)&_DYNAMIC; | ||||
modname = NULL; | modname = NULL; | ||||
modptr = preload_search_by_type("elf" __XSTRING(__ELF_WORD_SIZE) " kernel"); | modptr = preload_search_by_type("elf" __XSTRING(__ELF_WORD_SIZE) " kernel"); | ||||
if (modptr == NULL) | if (modptr == NULL) | ||||
modptr = preload_search_by_type("elf kernel"); | modptr = preload_search_by_type("elf kernel"); | ||||
if (modptr != NULL) | if (modptr != NULL) | ||||
modname = (char *)preload_search_info(modptr, MODINFO_NAME); | modname = (char *)preload_search_info(modptr, MODINFO_NAME); | ||||
▲ Show 20 Lines • Show All 522 Lines • ▼ Show 20 Lines | #endif | ||||
for (i = 0; i < nsegs; i++) { | for (i = 0; i < nsegs; i++) { | ||||
caddr_t segbase = mapbase + segs[i]->p_vaddr - base_vaddr; | caddr_t segbase = mapbase + segs[i]->p_vaddr - base_vaddr; | ||||
error = vn_rdwr(UIO_READ, nd.ni_vp, | error = vn_rdwr(UIO_READ, nd.ni_vp, | ||||
segbase, segs[i]->p_filesz, segs[i]->p_offset, | segbase, segs[i]->p_filesz, segs[i]->p_offset, | ||||
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, | UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, | ||||
&resid, td); | &resid, td); | ||||
if (error != 0) | if (error != 0) | ||||
goto out; | goto out; | ||||
bzero(segbase + segs[i]->p_filesz, | memset(segbase + segs[i]->p_filesz, 0, | ||||
segs[i]->p_memsz - segs[i]->p_filesz); | segs[i]->p_memsz - segs[i]->p_filesz); | ||||
#ifdef SPARSE_MAPPING | #ifdef SPARSE_MAPPING | ||||
/* | /* | ||||
* Wire down the pages | * Wire down the pages | ||||
*/ | */ | ||||
error = vm_map_wire(kernel_map, | error = vm_map_wire(kernel_map, | ||||
(vm_offset_t) segbase, | (vm_offset_t) segbase, | ||||
▲ Show 20 Lines • Show All 103 Lines • ▼ Show 20 Lines | if (error != 0 && lf != NULL) | ||||
linker_file_unload(lf, LINKER_UNLOAD_FORCE); | linker_file_unload(lf, LINKER_UNLOAD_FORCE); | ||||
if (shdr != NULL) | if (shdr != NULL) | ||||
free(shdr, M_LINKER); | free(shdr, M_LINKER); | ||||
if (firstpage != NULL) | if (firstpage != NULL) | ||||
free(firstpage, M_LINKER); | free(firstpage, M_LINKER); | ||||
return (error); | return (error); | ||||
} | } | ||||
#ifdef KLDGZELF | |||||
typedef struct gzcontext { | |||||
u_char *out_p; | |||||
u_int inflated_size; | |||||
struct vnode *vd; | |||||
struct thread *td; | |||||
int error; | |||||
off_t skip; | |||||
} *gzcontext_t; | |||||
typedef struct gz_hdr { | |||||
u_char id1; | |||||
u_char id2; | |||||
u_char cm; | |||||
u_char flags; | |||||
u_int mtime; | |||||
u_char xflags; | |||||
u_char os; | |||||
}__attribute__((__packed__)) *gz_hdr_t; | |||||
static long gzhdr(u_char *, int); | |||||
static int gzelf_inflate(struct gzcontext *); | |||||
static void *zalloc(void *, u_int, u_int); | |||||
static void zfree(void *, void *); | |||||
/* | |||||
* Checks buffer for GZIP header. | |||||
* | |||||
* Returns: number of bytes skipped while processing header (> 0) | |||||
* or Z_DATA_ERROR (< 0) in case of failure | |||||
*/ | |||||
static long | |||||
gzhdr(u_char *p, int len) | |||||
{ | |||||
struct gz_hdr *hdr = (struct gz_hdr *)p; | |||||
u_short size = 0; | |||||
u_long total = sizeof(*hdr); | |||||
if (len < total) | |||||
return (Z_DATA_ERROR); | |||||
if (hdr->id1 != GZ_ID1 || hdr->id2 != GZ_ID2) { | |||||
printf("Not a GZIP format\n"); | |||||
return (Z_DATA_ERROR); | |||||
} | |||||
if (hdr->cm != GZ_CM) { | |||||
printf("Unsupported compression\n"); | |||||
return (Z_DATA_ERROR); | |||||
} | |||||
p += sizeof(*hdr); | |||||
/* Process optional fields */ | |||||
/* Extra field */ | |||||
if (hdr->flags & GZ_FLG_FEXTRA) { | |||||
if (total + GZ_EXTRA_F_SIZE_SIZE > len) | |||||
return (Z_DATA_ERROR); | |||||
/* | |||||
* Extra field length, 2 bytes, does not include size | |||||
* itself. | |||||
*/ | |||||
size = *(u_short *)p; | |||||
total += GZ_EXTRA_F_SIZE_SIZE; | |||||
p += GZ_EXTRA_F_SIZE_SIZE; | |||||
if (total + size > len) | |||||
return (Z_DATA_ERROR); | |||||
total += size; | |||||
p += size; | |||||
} | |||||
/* Skip over the file name */ | |||||
if (hdr->flags & GZ_FLG_FNAME) { | |||||
do { | |||||
if (total >= len) | |||||
return (Z_DATA_ERROR); | |||||
total++; | |||||
} while (*p++ != 0); | |||||
} | |||||
/* Skip comment */ | |||||
if (hdr->flags & GZ_FLG_FCOMMENT) { | |||||
do { | |||||
if (total >= len) | |||||
return (Z_DATA_ERROR); | |||||
total++; | |||||
} while (*p++ != 0); | |||||
} | |||||
/* Header crc */ | |||||
if (hdr->flags & GZ_FLG_FHCRC) { | |||||
total += 2; | |||||
if (total > len) | |||||
return (Z_DATA_ERROR); | |||||
} | |||||
/* | |||||
* Successfully went through gzip header, return number of | |||||
* octets processed | |||||
*/ | |||||
return (total); | |||||
} | |||||
static void * | |||||
zalloc(void *_up __unused, u_int items, u_int size) | |||||
{ | |||||
return (malloc(size*items, M_LINKER, M_WAITOK)); | |||||
} | |||||
static void | |||||
zfree(void *_up __unused, void *p) | |||||
{ | |||||
free(p, M_LINKER); | |||||
} | |||||
static int | |||||
gzelf_inflate(struct gzcontext *gzc) | |||||
{ | |||||
z_stream strm; | |||||
u_char *in_p = NULL; | |||||
int ret = Z_OK; | |||||
struct stat sb; | |||||
off_t off = 0; | |||||
ssize_t resid; | |||||
ssize_t loaded_bytes; | |||||
gzc->error = 0; | |||||
memset(&strm, 0, sizeof(strm)); | |||||
strm.zalloc = zalloc; | |||||
strm.zfree = zfree; | |||||
ret = inflateInit2(&strm, -15); | |||||
if (ret != Z_OK) | |||||
goto out; | |||||
ret = Z_ERRNO; | |||||
/* Alloc one page for purpose of checking if given file is | |||||
gzip file indeed and getting inflated file size */ | |||||
in_p = malloc(PAGE_SIZE, M_LINKER, M_WAITOK); | |||||
gzc->error = vn_rdwr(UIO_READ, gzc->vd, in_p, PAGE_SIZE, 0, | |||||
UIO_SYSSPACE, IO_NODELOCKED, gzc->td->td_ucred, NOCRED, | |||||
&resid, gzc->td); | |||||
if (gzc->error != 0) | |||||
goto out; | |||||
ret = gzhdr(in_p, PAGE_SIZE - resid); | |||||
if (ret < 0) { | |||||
ret = Z_DATA_ERROR; | |||||
goto out; | |||||
} | |||||
gzc->skip = ret; | |||||
gzc->error = vn_stat(gzc->vd, &sb, gzc->td->td_ucred, NOCRED, gzc->td); | |||||
if (gzc->error != 0) | |||||
goto out; | |||||
gzc->error = vn_rdwr(UIO_READ, gzc->vd, in_p, PAGE_SIZE, | |||||
MAX(0, sb.st_size - PAGE_SIZE), UIO_SYSSPACE, IO_NODELOCKED, | |||||
gzc->td->td_ucred, NOCRED, &resid, gzc->td); | |||||
if (gzc->error != 0) | |||||
goto out; | |||||
/* Last four bytes of GZIPed file store size of inlated data */ | |||||
loaded_bytes = PAGE_SIZE - resid; | |||||
gzc->inflated_size = *(u_int *)(in_p + loaded_bytes - GZ_INFLATED_SIZE_SIZE); | |||||
/* Be reasonable, 100MB of module is enough */ | |||||
if (gzc->inflated_size > (100 * 1024 * 1024)) { | |||||
gzc->error = E2BIG; | |||||
goto out; | |||||
} | |||||
gzc->out_p = realloc(in_p, gzc->inflated_size, M_LINKER, M_WAITOK); | |||||
strm.avail_out = gzc->inflated_size; | |||||
strm.next_out = gzc->out_p; | |||||
do { | |||||
gzc->error = vn_rdwr(UIO_READ, gzc->vd, in_p, PAGE_SIZE, | |||||
off + gzc->skip, UIO_SYSSPACE, IO_NODELOCKED, | |||||
gzc->td->td_ucred, NOCRED, &resid, gzc->td); | |||||
if (gzc->error) { | |||||
ret = Z_ERRNO; | |||||
goto out; | |||||
} | |||||
strm.avail_in = PAGE_SIZE - resid; | |||||
strm.next_in = in_p; | |||||
off += strm.avail_in; | |||||
ret = inflate(&strm, Z_NO_FLUSH); | |||||
if (ret == Z_NEED_DICT) | |||||
ret = Z_DATA_ERROR; | |||||
/* All negative return codes mean error */ | |||||
if (ret < 0) | |||||
goto out; | |||||
} while (strm.avail_out > 0 && ret != Z_STREAM_END); | |||||
/* | |||||
* We run out of buffer space for data and still have not inflated | |||||
* all of data. | |||||
*/ | |||||
if (strm.avail_out == 0 && ret == Z_OK) | |||||
ret = Z_DATA_ERROR; | |||||
/* | |||||
* Expected inflated size differs from obtained, something | |||||
* went wrong. | |||||
*/ | |||||
if (strm.avail_out != 0 && ret == Z_STREAM_END) | |||||
ret = Z_DATA_ERROR; | |||||
/* Return Z_OK if stream fully decompressed to avoid confusion */ | |||||
if (ret == Z_STREAM_END) | |||||
ret = Z_OK; | |||||
out: | |||||
/* Close file and release buffers */ | |||||
inflateEnd(&strm); | |||||
free(in_p, M_LINKER); | |||||
if (ret != Z_OK) { | |||||
free(gzc->out_p, M_LINKER); | |||||
gzc->out_p = NULL; | |||||
} | |||||
if (gzc->error != 0) | |||||
return (Z_ERRNO); | |||||
return (ret); | |||||
} | |||||
static int | |||||
link_gzelf_load_file(linker_class_t cls, const char* filename, | |||||
linker_file_t* result) | |||||
{ | |||||
struct nameidata nd; | |||||
struct thread* td = curthread; /* XXX */ | |||||
Elf_Ehdr *hdr; | |||||
int nbytes, i; | |||||
Elf_Phdr *phdr; | |||||
Elf_Phdr *phlimit; | |||||
Elf_Phdr *segs[MAXSEGS]; | |||||
int nsegs; | |||||
Elf_Phdr *phdyn; | |||||
Elf_Phdr *phphdr; | |||||
caddr_t mapbase; | |||||
size_t mapsize; | |||||
Elf_Off base_offset; | |||||
Elf_Addr base_vaddr; | |||||
Elf_Addr base_vlimit; | |||||
int error = 0; | |||||
int flags; | |||||
elf_file_t ef; | |||||
linker_file_t lf; | |||||
Elf_Shdr *shdr; | |||||
int symtabindex; | |||||
int symstrindex; | |||||
int symcnt; | |||||
int strcnt; | |||||
struct gzcontext gzc; | |||||
shdr = NULL; | |||||
lf = NULL; | |||||
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename, td); | |||||
flags = FREAD; | |||||
error = vn_open(&nd, &flags, 0, NULL); | |||||
if (error != 0) | |||||
return (error); | |||||
NDFREE(&nd, NDF_ONLY_PNBUF); | |||||
if (nd.ni_vp->v_type != VREG) { | |||||
error = ENOEXEC; | |||||
goto out; | |||||
} | |||||
#ifdef MAC | |||||
error = mac_kld_check_load(curthread->td_ucred, nd.ni_vp); | |||||
if (error != 0) | |||||
goto out; | |||||
#endif | |||||
memset(&gzc, 0, sizeof(struct gzcontext)); | |||||
gzc.td = td; | |||||
gzc.vd = nd.ni_vp; | |||||
if (gzelf_inflate(&gzc) != Z_OK) { | |||||
if (gzc.error != 0) | |||||
error = gzc.error; | |||||
else | |||||
error = EIO; | |||||
} | |||||
nbytes = gzc.inflated_size; | |||||
/* File is no longer needed to be open */ | |||||
VOP_UNLOCK(nd.ni_vp, 0); | |||||
vn_close(nd.ni_vp, FREAD, td->td_ucred, td); | |||||
hdr = (Elf_Ehdr *)gzc.out_p; | |||||
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_error(filename, "Unsupported file layout"); | |||||
error = ENOEXEC; | |||||
goto out; | |||||
} | |||||
if (hdr->e_ident[EI_VERSION] != EV_CURRENT || | |||||
hdr->e_version != EV_CURRENT) { | |||||
link_elf_error(filename, "Unsupported file version"); | |||||
error = ENOEXEC; | |||||
goto out; | |||||
} | |||||
if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) { | |||||
error = ENOSYS; | |||||
goto out; | |||||
} | |||||
if (hdr->e_machine != ELF_TARG_MACH) { | |||||
link_elf_error(filename, "Unsupported machine"); | |||||
error = ENOEXEC; | |||||
goto out; | |||||
} | |||||
/* | |||||
* We rely on the program header being in the first page. | |||||
* This is not strictly required by the ABI specification, but | |||||
* it seems to always true in practice. And, it simplifies | |||||
* things considerably. | |||||
*/ | |||||
if (!((hdr->e_phentsize == sizeof(Elf_Phdr)) && | |||||
(hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= PAGE_SIZE) && | |||||
(hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= nbytes))) | |||||
link_elf_error(filename, "Unreadable program headers"); | |||||
/* | |||||
* Scan the program header entries, and save key information. | |||||
* | |||||
* We rely on there being exactly two load segments, text and data, | |||||
* in that order. | |||||
*/ | |||||
phdr = (Elf_Phdr *) (gzc.out_p + hdr->e_phoff); | |||||
phlimit = phdr + hdr->e_phnum; | |||||
nsegs = 0; | |||||
phdyn = NULL; | |||||
phphdr = NULL; | |||||
while (phdr < phlimit) { | |||||
switch (phdr->p_type) { | |||||
case PT_LOAD: | |||||
if (nsegs == MAXSEGS) { | |||||
link_elf_error(filename, "Too many sections"); | |||||
error = ENOEXEC; | |||||
goto out; | |||||
} | |||||
/* | |||||
* XXX: We just trust they come in right order ?? | |||||
*/ | |||||
segs[nsegs] = phdr; | |||||
++nsegs; | |||||
break; | |||||
case PT_PHDR: | |||||
phphdr = phdr; | |||||
break; | |||||
case PT_DYNAMIC: | |||||
phdyn = phdr; | |||||
break; | |||||
case PT_INTERP: | |||||
error = ENOSYS; | |||||
goto out; | |||||
} | |||||
++phdr; | |||||
} | |||||
if (phdyn == NULL) { | |||||
link_elf_error(filename, "Object is not dynamically-linked"); | |||||
error = ENOEXEC; | |||||
goto out; | |||||
} | |||||
if (nsegs == 0) { | |||||
link_elf_error(filename, "No sections"); | |||||
error = ENOEXEC; | |||||
goto out; | |||||
} | |||||
/* | |||||
* Allocate the entire address space of the object, to stake | |||||
* out our contiguous region, and to establish the base | |||||
* address for relocation. | |||||
*/ | |||||
base_offset = trunc_page(segs[0]->p_offset); | |||||
base_vaddr = trunc_page(segs[0]->p_vaddr); | |||||
base_vlimit = round_page(segs[nsegs - 1]->p_vaddr + | |||||
segs[nsegs - 1]->p_memsz); | |||||
mapsize = base_vlimit - base_vaddr; | |||||
lf = linker_make_file(filename, &link_elf_class); | |||||
if (lf == NULL) { | |||||
error = ENOMEM; | |||||
goto out; | |||||
} | |||||
ef = (elf_file_t) lf; | |||||
#ifdef SPARSE_MAPPING | |||||
ef->object = vm_object_allocate(OBJT_DEFAULT, mapsize >> PAGE_SHIFT); | |||||
if (ef->object == NULL) { | |||||
error = ENOMEM; | |||||
goto out; | |||||
} | |||||
ef->address = (caddr_t) vm_map_min(kernel_map); | |||||
error = vm_map_find(kernel_map, ef->object, 0, | |||||
(vm_offset_t *) &ef->address, mapsize, 0, VMFS_OPTIMAL_SPACE, | |||||
VM_PROT_ALL, VM_PROT_ALL, 0); | |||||
if (error != 0) { | |||||
vm_object_deallocate(ef->object); | |||||
ef->object = 0; | |||||
goto out; | |||||
} | |||||
#else | |||||
ef->address = malloc(mapsize, M_LINKER, M_WAITOK); | |||||
#endif | |||||
mapbase = ef->address; | |||||
/* | |||||
* Read the text and data sections and zero the bss. | |||||
*/ | |||||
for (i = 0; i < nsegs; i++) { | |||||
caddr_t segbase = mapbase + segs[i]->p_vaddr - base_vaddr; | |||||
memcpy(segbase, gzc.out_p + segs[i]->p_offset, segs[i]->p_filesz); | |||||
memset(segbase + segs[i]->p_filesz, 0, | |||||
segs[i]->p_memsz - segs[i]->p_filesz); | |||||
#ifdef SPARSE_MAPPING | |||||
/* | |||||
* Wire down the pages | |||||
*/ | |||||
error = vm_map_wire(kernel_map, | |||||
(vm_offset_t) segbase, | |||||
(vm_offset_t) segbase + segs[i]->p_memsz, | |||||
VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES); | |||||
if (error != KERN_SUCCESS) { | |||||
error = ENOMEM; | |||||
goto out; | |||||
} | |||||
#endif | |||||
} | |||||
#ifdef GPROF | |||||
/* Update profiling information with the new text segment. */ | |||||
mtx_lock(&Giant); | |||||
kmupetext((uintfptr_t)(mapbase + segs[0]->p_vaddr - base_vaddr + | |||||
segs[0]->p_memsz)); | |||||
mtx_unlock(&Giant); | |||||
#endif | |||||
ef->dynamic = (Elf_Dyn *) (mapbase + phdyn->p_vaddr - base_vaddr); | |||||
lf->address = ef->address; | |||||
lf->size = mapsize; | |||||
error = parse_dynamic(ef); | |||||
if (error != 0) | |||||
goto out; | |||||
error = parse_dpcpu(ef); | |||||
if (error != 0) | |||||
goto out; | |||||
#ifdef VIMAGE | |||||
error = parse_vnet(ef); | |||||
if (error != 0) | |||||
goto out; | |||||
#endif | |||||
link_elf_reloc_local(lf); | |||||
error = linker_load_dependencies(lf); | |||||
if (error != 0) | |||||
goto out; | |||||
error = relocate_file(ef); | |||||
if (error != 0) | |||||
goto out; | |||||
/* | |||||
* Try and load the symbol table if it's present. (you can | |||||
* strip it!) | |||||
*/ | |||||
nbytes = hdr->e_shnum * hdr->e_shentsize; | |||||
if (nbytes == 0 || hdr->e_shoff == 0) | |||||
goto nosyms; | |||||
shdr = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO); | |||||
if (shdr == NULL) { | |||||
error = ENOMEM; | |||||
goto out; | |||||
} | |||||
memcpy(shdr, gzc.out_p + hdr->e_shoff, nbytes); | |||||
symtabindex = -1; | |||||
symstrindex = -1; | |||||
for (i = 0; i < hdr->e_shnum; i++) { | |||||
if (shdr[i].sh_type == SHT_SYMTAB) { | |||||
symtabindex = i; | |||||
symstrindex = shdr[i].sh_link; | |||||
} | |||||
} | |||||
if (symtabindex < 0 || symstrindex < 0) | |||||
goto nosyms; | |||||
symcnt = shdr[symtabindex].sh_size; | |||||
ef->symbase = malloc(symcnt, M_LINKER, M_WAITOK); | |||||
strcnt = shdr[symstrindex].sh_size; | |||||
ef->strbase = malloc(strcnt, M_LINKER, M_WAITOK); | |||||
memcpy(ef->symbase, gzc.out_p + shdr[symtabindex].sh_offset, symcnt); | |||||
memcpy(ef->strbase, gzc.out_p + shdr[symstrindex].sh_offset, strcnt); | |||||
ef->ddbsymcnt = symcnt / sizeof(Elf_Sym); | |||||
ef->ddbsymtab = (const Elf_Sym *)ef->symbase; | |||||
ef->ddbstrcnt = strcnt; | |||||
ef->ddbstrtab = ef->strbase; | |||||
nosyms: | |||||
error = link_elf_link_common_finish(lf); | |||||
if (error != 0) | |||||
goto out; | |||||
*result = lf; | |||||
out: | |||||
if (error != 0 && lf != NULL) | |||||
linker_file_unload(lf, LINKER_UNLOAD_FORCE); | |||||
if (shdr != NULL) | |||||
free(shdr, M_LINKER); | |||||
free(gzc.out_p, M_LINKER); | |||||
return (error); | |||||
} | |||||
#endif | |||||
Elf_Addr | Elf_Addr | ||||
elf_relocaddr(linker_file_t lf, Elf_Addr x) | elf_relocaddr(linker_file_t lf, Elf_Addr x) | ||||
{ | { | ||||
elf_file_t ef; | elf_file_t ef; | ||||
ef = (elf_file_t)lf; | ef = (elf_file_t)lf; | ||||
if (x >= ef->pcpu_start && x < ef->pcpu_stop) | if (x >= ef->pcpu_start && x < ef->pcpu_stop) | ||||
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