#ifdef __minix
#define munmap minix_munmap
+#define mmap minix_mmap
+#ifndef MAP_SHARED
+#define MAP_SHARED MAP_PRIVATE /* minix: MAP_SHARED should be MAP_PRIVATE */
+#endif
#endif
#define MINIXVERBOSE 0
#define EA_UNDEF (~(Elf_Addr)0)
-static void Pread(void *addr, size_t size, int fd, off_t off)
-{
- int s;
- if((s=pread(fd,addr, size, off)) < 0) {
- _rtld_error("pread failed");
- exit(1);
- }
-
-#if MINIXVERBOSE
- fprintf(stderr, "read 0x%lx bytes from offset 0x%lx to addr 0x%lx\n", size, off, addr);
-#endif
-}
-
/*
* Map a shared object into memory. The argument is a file descriptor,
* which must be open on the object and positioned at its beginning.
caddr_t clear_addr;
size_t nclear;
#endif
+ size_t bsslen;
if (sb != NULL && sb->st_size < (off_t)sizeof (Elf_Ehdr)) {
_rtld_error("%s: not ELF file (too short)", path);
obj->ino = sb->st_ino;
}
-#ifdef __minix
- ehdr = minix_mmap(NULL, _rtld_pagesz, PROT_READ|PROT_WRITE,
- MAP_PREALLOC|MAP_ANON, -1, (off_t)0);
- Pread(ehdr, _rtld_pagesz, fd, 0);
-#if MINIXVERBOSE
- fprintf(stderr, "minix mmap for header: 0x%lx\n", ehdr);
-#endif
-#else
ehdr = mmap(NULL, _rtld_pagesz, PROT_READ, MAP_FILE | MAP_SHARED, fd,
(off_t)0);
-#endif
obj->ehdr = ehdr;
if (ehdr == MAP_FAILED) {
+#if defined(__minix) && defined(RTLD_LOADER)
+ return _rtld_map_object_fallback(path, fd, sb);
+#else
_rtld_error("%s: read error: %s", path, xstrerror(errno));
goto bad;
+#endif
}
/* Make sure the file is valid */
if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0) {
/* Unmap header if it overlaps the first load section. */
if (base_offset < _rtld_pagesz) {
+ dbg(("error; base_offset = 0x%lx, pagesize 0x%lx\n",
+ base_offset, _rtld_pagesz));
munmap(ehdr, _rtld_pagesz);
obj->ehdr = MAP_FAILED;
}
#endif
mapsize = base_vlimit - base_vaddr;
-#ifndef __minix
mapbase = mmap(base_addr, mapsize, text_flags,
mapflags | MAP_FILE | MAP_PRIVATE, fd, base_offset);
-#else
- mapbase = minix_mmap(base_addr, mapsize, PROT_READ|PROT_WRITE,
- MAP_ANON | MAP_PREALLOC, -1, 0);
-#if MINIXVERBOSE
- fprintf(stderr, "minix mmap for whole block: 0x%lx-0x%lx\n", mapbase, mapbase+mapsize);
-#endif
- Pread(mapbase, obj->textsize, fd, 0);
-#endif
+
if (mapbase == MAP_FAILED) {
_rtld_error("mmap of entire address space failed: %s",
xstrerror(errno));
/* Overlay the data segment onto the proper region. */
data_addr = mapbase + (data_vaddr - base_vaddr);
-#ifdef __minix
- Pread(data_addr, data_vlimit - data_vaddr, fd, data_offset);
-#else
+
if (mmap(data_addr, data_vlimit - data_vaddr, data_flags,
MAP_FILE | MAP_PRIVATE | MAP_FIXED, fd, data_offset) ==
MAP_FAILED) {
}
/* Overlay the bss segment onto the proper region. */
+#ifdef __minix
+ bsslen = base_vlimit - data_vlimit;
+ if (bsslen > 0 &&
+ mmap(mapbase + data_vlimit - base_vaddr, bsslen,
+#else
if (mmap(mapbase + data_vlimit - base_vaddr, base_vlimit - data_vlimit,
+#endif
data_flags, MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0) ==
MAP_FAILED) {
_rtld_error("mmap of bss failed: %s", xstrerror(errno));
}
/* Unmap the gap between the text and data. */
+#ifndef __minix
gap_addr = mapbase + round_up(text_vlimit - base_vaddr);
gap_size = data_addr - gap_addr;
if (gap_size != 0 && mprotect(gap_addr, gap_size, PROT_NONE) == -1) {
#endif
if (elfflags & PF_X)
prot |= PROT_EXEC;
+#ifdef __minix
+ /* Minix has to map it writable so we can do relocations
+ * as we don't have mprotect() yet.
+ */
+ prot |= PROT_WRITE;
+#endif
return prot;
}
--- /dev/null
+/* $NetBSD: map_object.c,v 1.45 2012/10/13 21:13:07 dholland Exp $ */
+
+/*
+ * Copyright 1996 John D. Polstra.
+ * Copyright 1996 Matt Thomas <matt@3am-software.com>
+ * Copyright 2002 Charles M. Hannum <root@ihack.net>
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by John Polstra.
+ * 4. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+__RCSID("$NetBSD: map_object.c,v 1.45 2012/10/13 21:13:07 dholland Exp $");
+#endif /* not lint */
+
+#include <errno.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+
+#include "debug.h"
+#include "rtld.h"
+
+#ifdef __minix
+#define munmap minix_munmap
+#endif
+
+#define MINIXVERBOSE 0
+
+#if MINIXVERBOSE
+#include <stdio.h>
+#endif
+
+static int protflags(int); /* Elf flags -> mmap protection */
+
+#define EA_UNDEF (~(Elf_Addr)0)
+
+static void Pread(void *addr, size_t size, int fd, off_t off)
+{
+ int s;
+ if((s=pread(fd,addr, size, off)) < 0) {
+ _rtld_error("pread failed");
+ exit(1);
+ }
+
+#if MINIXVERBOSE
+ fprintf(stderr, "read 0x%lx bytes from offset 0x%lx to addr 0x%lx\n", size, off, addr);
+#endif
+}
+
+/* minix-without-mmap version of _rtld_map_object() */
+Obj_Entry *
+_rtld_map_object_fallback(const char *path, int fd, const struct stat *sb)
+{
+ Obj_Entry *obj;
+ Elf_Ehdr *ehdr;
+ Elf_Phdr *phdr;
+#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
+ Elf_Phdr *phtls;
+#endif
+ size_t phsize;
+ Elf_Phdr *phlimit;
+ Elf_Phdr *segs[2];
+ int nsegs;
+ caddr_t mapbase = MAP_FAILED;
+ size_t mapsize = 0;
+ int mapflags;
+ Elf_Off base_offset;
+#ifdef MAP_ALIGNED
+ Elf_Addr base_alignment;
+#endif
+ Elf_Addr base_vaddr;
+ Elf_Addr base_vlimit;
+ Elf_Addr text_vlimit;
+ int text_flags;
+ caddr_t base_addr;
+ Elf_Off data_offset;
+ Elf_Addr data_vaddr;
+ Elf_Addr data_vlimit;
+ int data_flags;
+ caddr_t data_addr;
+#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
+ Elf_Addr tls_vaddr = 0; /* Noise GCC */
+#endif
+ Elf_Addr phdr_vaddr;
+ size_t phdr_memsz;
+#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
+ caddr_t gap_addr;
+ size_t gap_size;
+#endif
+ int i;
+#ifdef RTLD_LOADER
+ Elf_Addr clear_vaddr;
+ caddr_t clear_addr;
+ size_t nclear;
+#endif
+
+ if (sb != NULL && sb->st_size < (off_t)sizeof (Elf_Ehdr)) {
+ _rtld_error("%s: not ELF file (too short)", path);
+ return NULL;
+ }
+
+ obj = _rtld_obj_new();
+ obj->path = xstrdup(path);
+ obj->pathlen = strlen(path);
+ if (sb != NULL) {
+ obj->dev = sb->st_dev;
+ obj->ino = sb->st_ino;
+ }
+
+#ifdef __minix
+ ehdr = minix_mmap(NULL, _rtld_pagesz, PROT_READ|PROT_WRITE,
+ MAP_PREALLOC|MAP_ANON, -1, (off_t)0);
+ Pread(ehdr, _rtld_pagesz, fd, 0);
+#if MINIXVERBOSE
+ fprintf(stderr, "minix mmap for header: 0x%lx\n", ehdr);
+#endif
+#else
+ ehdr = mmap(NULL, _rtld_pagesz, PROT_READ, MAP_FILE | MAP_SHARED, fd,
+ (off_t)0);
+#endif
+ obj->ehdr = ehdr;
+ if (ehdr == MAP_FAILED) {
+ _rtld_error("%s: read error: %s", path, xstrerror(errno));
+ goto bad;
+ }
+ /* Make sure the file is valid */
+ if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0) {
+ _rtld_error("%s: not ELF file (magic number bad)", path);
+ goto bad;
+ }
+ if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
+ _rtld_error("%s: invalid ELF class %x; expected %x", path,
+ ehdr->e_ident[EI_CLASS], ELFCLASS);
+ goto bad;
+ }
+ /* Elf_e_ident includes class */
+ if (ehdr->e_ident[EI_VERSION] != EV_CURRENT ||
+ ehdr->e_version != EV_CURRENT ||
+ ehdr->e_ident[EI_DATA] != ELFDEFNNAME(MACHDEP_ENDIANNESS)) {
+ _rtld_error("%s: unsupported file version", path);
+ goto bad;
+ }
+ if (ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN) {
+ _rtld_error("%s: unsupported file type", path);
+ goto bad;
+ }
+ switch (ehdr->e_machine) {
+ ELFDEFNNAME(MACHDEP_ID_CASES)
+ default:
+ _rtld_error("%s: unsupported machine", path);
+ goto bad;
+ }
+
+ /*
+ * 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.
+ */
+ assert(ehdr->e_phentsize == sizeof(Elf_Phdr));
+ assert(ehdr->e_phoff + ehdr->e_phnum * sizeof(Elf_Phdr) <=
+ _rtld_pagesz);
+
+ /*
+ * 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 *) ((caddr_t)ehdr + ehdr->e_phoff);
+#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
+ phtls = NULL;
+#endif
+ phsize = ehdr->e_phnum * sizeof(phdr[0]);
+ obj->phdr = NULL;
+ phdr_vaddr = EA_UNDEF;
+ phdr_memsz = 0;
+ phlimit = phdr + ehdr->e_phnum;
+ nsegs = 0;
+ while (phdr < phlimit) {
+ switch (phdr->p_type) {
+ case PT_INTERP:
+ obj->interp = (void *)(uintptr_t)phdr->p_vaddr;
+ dbg(("%s: PT_INTERP %p", obj->path, obj->interp));
+ break;
+
+ case PT_LOAD:
+ if (nsegs < 2)
+ segs[nsegs] = phdr;
+ ++nsegs;
+
+#if ELFSIZE == 64
+#define PRImemsz PRIu64
+#else
+#define PRImemsz PRIu32
+#endif
+ dbg(("%s: %s %p phsize %" PRImemsz, obj->path, "PT_LOAD",
+ (void *)(uintptr_t)phdr->p_vaddr, phdr->p_memsz));
+ break;
+
+ case PT_PHDR:
+ phdr_vaddr = phdr->p_vaddr;
+ phdr_memsz = phdr->p_memsz;
+ dbg(("%s: %s %p phsize %" PRImemsz, obj->path, "PT_PHDR",
+ (void *)(uintptr_t)phdr->p_vaddr, phdr->p_memsz));
+ break;
+
+ case PT_DYNAMIC:
+ obj->dynamic = (void *)(uintptr_t)phdr->p_vaddr;
+ dbg(("%s: %s %p phsize %" PRImemsz, obj->path, "PT_DYNAMIC",
+ (void *)(uintptr_t)phdr->p_vaddr, phdr->p_memsz));
+ break;
+
+#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
+ case PT_TLS:
+ phtls = phdr;
+ dbg(("%s: %s %p phsize %" PRImemsz, obj->path, "PT_TLS",
+ (void *)(uintptr_t)phdr->p_vaddr, phdr->p_memsz));
+ break;
+#endif
+ }
+
+ ++phdr;
+ }
+ phdr = (Elf_Phdr *) ((caddr_t)ehdr + ehdr->e_phoff);
+ obj->entry = (void *)(uintptr_t)ehdr->e_entry;
+ if (!obj->dynamic) {
+ _rtld_error("%s: not dynamically linked", path);
+ goto bad;
+ }
+ if (nsegs != 2) {
+ _rtld_error("%s: wrong number of segments (%d != 2)", path,
+ nsegs);
+ goto bad;
+ }
+
+ /*
+ * Map the entire address space of the object as a file
+ * region to stake out our contiguous region and establish a
+ * base for relocation. We use a file mapping so that
+ * the kernel will give us whatever alignment is appropriate
+ * for the platform we're running on.
+ *
+ * We map it using the text protection, map the data segment
+ * into the right place, then map an anon segment for the bss
+ * and unmap the gaps left by padding to alignment.
+ */
+
+#ifdef MAP_ALIGNED
+ base_alignment = segs[0]->p_align;
+#endif
+ base_offset = round_down(segs[0]->p_offset);
+ base_vaddr = round_down(segs[0]->p_vaddr);
+ base_vlimit = round_up(segs[1]->p_vaddr + segs[1]->p_memsz);
+ text_vlimit = round_up(segs[0]->p_vaddr + segs[0]->p_memsz);
+ text_flags = protflags(segs[0]->p_flags);
+ data_offset = round_down(segs[1]->p_offset);
+ data_vaddr = round_down(segs[1]->p_vaddr);
+ data_vlimit = round_up(segs[1]->p_vaddr + segs[1]->p_filesz);
+ data_flags = protflags(segs[1]->p_flags);
+#ifdef RTLD_LOADER
+ clear_vaddr = segs[1]->p_vaddr + segs[1]->p_filesz;
+#endif
+
+ obj->textsize = text_vlimit - base_vaddr;
+ obj->vaddrbase = base_vaddr;
+ obj->isdynamic = ehdr->e_type == ET_DYN;
+
+#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
+ if (phtls != NULL) {
+ ++_rtld_tls_dtv_generation;
+ obj->tlsindex = ++_rtld_tls_max_index;
+ obj->tlssize = phtls->p_memsz;
+ obj->tlsalign = phtls->p_align;
+ obj->tlsinitsize = phtls->p_filesz;
+ tls_vaddr = phtls->p_vaddr;
+ }
+#endif
+
+ obj->phdr_loaded = false;
+ for (i = 0; i < nsegs; i++) {
+ if (phdr_vaddr != EA_UNDEF &&
+ segs[i]->p_vaddr <= phdr_vaddr &&
+ segs[i]->p_memsz >= phdr_memsz) {
+ obj->phdr_loaded = true;
+ break;
+ }
+ if (segs[i]->p_offset <= ehdr->e_phoff &&
+ segs[i]->p_memsz >= phsize) {
+ phdr_vaddr = segs[i]->p_vaddr + ehdr->e_phoff;
+ phdr_memsz = phsize;
+ obj->phdr_loaded = true;
+ break;
+ }
+ }
+ if (obj->phdr_loaded) {
+ obj->phdr = (void *)(uintptr_t)phdr_vaddr;
+ obj->phsize = phdr_memsz;
+ } else {
+ Elf_Phdr *buf;
+ buf = xmalloc(phsize);
+ if (buf == NULL) {
+ _rtld_error("%s: cannot allocate program header", path);
+ goto bad;
+ }
+ memcpy(buf, phdr, phsize);
+ obj->phdr = buf;
+ obj->phsize = phsize;
+ }
+ dbg(("%s: phdr %p phsize %zu (%s)", obj->path, obj->phdr, obj->phsize,
+ obj->phdr_loaded ? "loaded" : "allocated"));
+
+ /* Unmap header if it overlaps the first load section. */
+ if (base_offset < _rtld_pagesz) {
+ munmap(ehdr, _rtld_pagesz);
+ obj->ehdr = MAP_FAILED;
+ }
+
+ /*
+ * Calculate log2 of the base section alignment.
+ */
+ mapflags = 0;
+#ifdef MAP_ALIGNED
+ if (base_alignment > _rtld_pagesz) {
+ unsigned int log2 = 0;
+ for (; base_alignment > 1; base_alignment >>= 1)
+ log2++;
+ mapflags = MAP_ALIGNED(log2);
+ }
+#endif
+
+#ifdef RTLD_LOADER
+ base_addr = obj->isdynamic ? NULL : (caddr_t)base_vaddr;
+#else
+ base_addr = NULL;
+#endif
+ mapsize = base_vlimit - base_vaddr;
+
+#ifndef __minix
+ mapbase = mmap(base_addr, mapsize, text_flags,
+ mapflags | MAP_FILE | MAP_PRIVATE, fd, base_offset);
+#else
+ mapbase = minix_mmap(base_addr, mapsize, PROT_READ|PROT_WRITE,
+ MAP_ANON | MAP_PREALLOC, -1, 0);
+#if MINIXVERBOSE
+ fprintf(stderr, "minix mmap for whole block: 0x%lx-0x%lx\n", mapbase, mapbase+mapsize);
+#endif
+ Pread(mapbase, obj->textsize, fd, 0);
+#endif
+ if (mapbase == MAP_FAILED) {
+ _rtld_error("mmap of entire address space failed: %s",
+ xstrerror(errno));
+ goto bad;
+ }
+
+ /* Overlay the data segment onto the proper region. */
+ data_addr = mapbase + (data_vaddr - base_vaddr);
+#ifdef __minix
+ Pread(data_addr, data_vlimit - data_vaddr, fd, data_offset);
+#else
+ if (mmap(data_addr, data_vlimit - data_vaddr, data_flags,
+ MAP_FILE | MAP_PRIVATE | MAP_FIXED, fd, data_offset) ==
+ MAP_FAILED) {
+ _rtld_error("mmap of data failed: %s", xstrerror(errno));
+ goto bad;
+ }
+
+ /* Overlay the bss segment onto the proper region. */
+ if (mmap(mapbase + data_vlimit - base_vaddr, base_vlimit - data_vlimit,
+ data_flags, MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0) ==
+ MAP_FAILED) {
+ _rtld_error("mmap of bss failed: %s", xstrerror(errno));
+ goto bad;
+ }
+
+ /* Unmap the gap between the text and data. */
+ gap_addr = mapbase + round_up(text_vlimit - base_vaddr);
+ gap_size = data_addr - gap_addr;
+ if (gap_size != 0 && mprotect(gap_addr, gap_size, PROT_NONE) == -1) {
+ _rtld_error("mprotect of text -> data gap failed: %s",
+ xstrerror(errno));
+ goto bad;
+ }
+#endif
+
+#ifdef RTLD_LOADER
+ /* Clear any BSS in the last page of the data segment. */
+ clear_addr = mapbase + (clear_vaddr - base_vaddr);
+ if ((nclear = data_vlimit - clear_vaddr) > 0)
+ memset(clear_addr, 0, nclear);
+
+ /* Non-file portion of BSS mapped above. */
+#endif
+
+#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
+ if (phtls != NULL)
+ obj->tlsinit = mapbase + tls_vaddr;
+#endif
+
+ obj->mapbase = mapbase;
+ obj->mapsize = mapsize;
+ obj->relocbase = mapbase - base_vaddr;
+
+ if (obj->dynamic)
+ obj->dynamic = (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->dynamic);
+ if (obj->entry)
+ obj->entry = (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->entry);
+ if (obj->interp)
+ obj->interp = (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->interp);
+ if (obj->phdr_loaded)
+ obj->phdr = (void *)(obj->relocbase + (Elf_Addr)(uintptr_t)obj->phdr);
+
+ return obj;
+
+bad:
+ if (obj->ehdr != MAP_FAILED)
+ munmap(obj->ehdr, _rtld_pagesz);
+ if (mapbase != MAP_FAILED)
+ munmap(mapbase, mapsize);
+ _rtld_obj_free(obj);
+ return NULL;
+}
+
+/*
+ * Given a set of ELF protection flags, return the corresponding protection
+ * flags for MMAP.
+ */
+static int
+protflags(int elfflags)
+{
+ int prot = 0;
+
+ if (elfflags & PF_R)
+ prot |= PROT_READ;
+#ifdef RTLD_LOADER
+ if (elfflags & PF_W)
+ prot |= PROT_WRITE;
+#endif
+ if (elfflags & PF_X)
+ prot |= PROT_EXEC;
+ return prot;
+}