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-rw-r--r--linux-user/flatload.c790
1 files changed, 790 insertions, 0 deletions
diff --git a/linux-user/flatload.c b/linux-user/flatload.c
new file mode 100644
index 0000000000..1e2634b5a2
--- /dev/null
+++ b/linux-user/flatload.c
@@ -0,0 +1,790 @@
+/****************************************************************************/
+/*
+ * QEMU bFLT binary loader. Based on linux/fs/binfmt_flat.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Copyright (C) 2006 CodeSourcery.
+ * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com>
+ * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
+ * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com>
+ * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com>
+ * based heavily on:
+ *
+ * linux/fs/binfmt_aout.c:
+ * Copyright (C) 1991, 1992, 1996 Linus Torvalds
+ * linux/fs/binfmt_flat.c for 2.0 kernel
+ * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
+ * JAN/99 -- coded full program relocation (gerg@snapgear.com)
+ */
+
+/* ??? ZFLAT and shared library support is currently disabled. */
+
+/****************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "qemu.h"
+#include "flat.h"
+
+//#define DEBUG
+
+#ifdef DEBUG
+#define DBG_FLT(a...) printf(a)
+#else
+#define DBG_FLT(a...)
+#endif
+
+#define flat_reloc_valid(reloc, size) ((reloc) <= (size))
+#define flat_old_ram_flag(flag) (flag)
+#ifdef TARGET_WORDS_BIGENDIAN
+#define flat_get_relocate_addr(relval) (relval)
+#else
+#define flat_get_relocate_addr(relval) bswap32(relval)
+#endif
+
+#define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
+#define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
+
+struct lib_info {
+ target_ulong start_code; /* Start of text segment */
+ target_ulong start_data; /* Start of data segment */
+ target_ulong end_data; /* Start of bss section */
+ target_ulong start_brk; /* End of data segment */
+ target_ulong text_len; /* Length of text segment */
+ target_ulong entry; /* Start address for this module */
+ target_ulong build_date; /* When this one was compiled */
+ short loaded; /* Has this library been loaded? */
+};
+
+#ifdef CONFIG_BINFMT_SHARED_FLAT
+static int load_flat_shared_library(int id, struct lib_info *p);
+#endif
+
+struct linux_binprm;
+
+#define ntohl(x) be32_to_cpu(x)
+
+/****************************************************************************/
+/*
+ * create_flat_tables() parses the env- and arg-strings in new user
+ * memory and creates the pointer tables from them, and puts their
+ * addresses on the "stack", returning the new stack pointer value.
+ */
+
+/* Push a block of strings onto the guest stack. */
+static target_ulong copy_strings(target_ulong p, int n, char **s)
+{
+ int len;
+
+ while (n-- > 0) {
+ len = strlen(s[n]) + 1;
+ p -= len;
+ memcpy_to_target(p, s[n], len);
+ }
+
+ return p;
+}
+
+int target_pread(int fd, target_ulong ptr, target_ulong len,
+ target_ulong offset)
+{
+ void *buf;
+ int ret;
+
+ buf = lock_user(ptr, len, 0);
+ ret = pread(fd, buf, len, offset);
+ unlock_user(buf, ptr, len);
+ return ret;
+}
+/****************************************************************************/
+
+#ifdef CONFIG_BINFMT_ZFLAT
+
+#include <linux/zlib.h>
+
+#define LBUFSIZE 4000
+
+/* gzip flag byte */
+#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
+#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
+#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
+#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
+#define COMMENT 0x10 /* bit 4 set: file comment present */
+#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
+#define RESERVED 0xC0 /* bit 6,7: reserved */
+
+static int decompress_exec(
+ struct linux_binprm *bprm,
+ unsigned long offset,
+ char *dst,
+ long len,
+ int fd)
+{
+ unsigned char *buf;
+ z_stream strm;
+ loff_t fpos;
+ int ret, retval;
+
+ DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
+
+ memset(&strm, 0, sizeof(strm));
+ strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
+ if (strm.workspace == NULL) {
+ DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
+ return -ENOMEM;
+ }
+ buf = kmalloc(LBUFSIZE, GFP_KERNEL);
+ if (buf == NULL) {
+ DBG_FLT("binfmt_flat: no memory for read buffer\n");
+ retval = -ENOMEM;
+ goto out_free;
+ }
+
+ /* Read in first chunk of data and parse gzip header. */
+ fpos = offset;
+ ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
+
+ strm.next_in = buf;
+ strm.avail_in = ret;
+ strm.total_in = 0;
+
+ retval = -ENOEXEC;
+
+ /* Check minimum size -- gzip header */
+ if (ret < 10) {
+ DBG_FLT("binfmt_flat: file too small?\n");
+ goto out_free_buf;
+ }
+
+ /* Check gzip magic number */
+ if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
+ DBG_FLT("binfmt_flat: unknown compression magic?\n");
+ goto out_free_buf;
+ }
+
+ /* Check gzip method */
+ if (buf[2] != 8) {
+ DBG_FLT("binfmt_flat: unknown compression method?\n");
+ goto out_free_buf;
+ }
+ /* Check gzip flags */
+ if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
+ (buf[3] & RESERVED)) {
+ DBG_FLT("binfmt_flat: unknown flags?\n");
+ goto out_free_buf;
+ }
+
+ ret = 10;
+ if (buf[3] & EXTRA_FIELD) {
+ ret += 2 + buf[10] + (buf[11] << 8);
+ if (unlikely(LBUFSIZE == ret)) {
+ DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
+ goto out_free_buf;
+ }
+ }
+ if (buf[3] & ORIG_NAME) {
+ for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
+ ;
+ if (unlikely(LBUFSIZE == ret)) {
+ DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
+ goto out_free_buf;
+ }
+ }
+ if (buf[3] & COMMENT) {
+ for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
+ ;
+ if (unlikely(LBUFSIZE == ret)) {
+ DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
+ goto out_free_buf;
+ }
+ }
+
+ strm.next_in += ret;
+ strm.avail_in -= ret;
+
+ strm.next_out = dst;
+ strm.avail_out = len;
+ strm.total_out = 0;
+
+ if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
+ DBG_FLT("binfmt_flat: zlib init failed?\n");
+ goto out_free_buf;
+ }
+
+ while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
+ ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
+ if (ret <= 0)
+ break;
+ if (ret >= (unsigned long) -4096)
+ break;
+ len -= ret;
+
+ strm.next_in = buf;
+ strm.avail_in = ret;
+ strm.total_in = 0;
+ }
+
+ if (ret < 0) {
+ DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
+ ret, strm.msg);
+ goto out_zlib;
+ }
+
+ retval = 0;
+out_zlib:
+ zlib_inflateEnd(&strm);
+out_free_buf:
+ kfree(buf);
+out_free:
+ kfree(strm.workspace);
+out:
+ return retval;
+}
+
+#endif /* CONFIG_BINFMT_ZFLAT */
+
+/****************************************************************************/
+
+static target_ulong
+calc_reloc(target_ulong r, struct lib_info *p, int curid, int internalp)
+{
+ target_ulong addr;
+ int id;
+ target_ulong start_brk;
+ target_ulong start_data;
+ target_ulong text_len;
+ target_ulong start_code;
+
+#ifdef CONFIG_BINFMT_SHARED_FLAT
+#error needs checking
+ if (r == 0)
+ id = curid; /* Relocs of 0 are always self referring */
+ else {
+ id = (r >> 24) & 0xff; /* Find ID for this reloc */
+ r &= 0x00ffffff; /* Trim ID off here */
+ }
+ if (id >= MAX_SHARED_LIBS) {
+ fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n",
+ (unsigned) r, id);
+ goto failed;
+ }
+ if (curid != id) {
+ if (internalp) {
+ fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not "
+ "in same module (%d != %d)\n",
+ (unsigned) r, curid, id);
+ goto failed;
+ } else if ( ! p[id].loaded &&
+ load_flat_shared_library(id, p) > (unsigned long) -4096) {
+ fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id);
+ goto failed;
+ }
+ /* Check versioning information (i.e. time stamps) */
+ if (p[id].build_date && p[curid].build_date
+ && p[curid].build_date < p[id].build_date) {
+ fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n",
+ id, curid);
+ goto failed;
+ }
+ }
+#else
+ id = 0;
+#endif
+
+ start_brk = p[id].start_brk;
+ start_data = p[id].start_data;
+ start_code = p[id].start_code;
+ text_len = p[id].text_len;
+
+ if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
+ fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x "
+ "(0 - 0x%x/0x%x)\n",
+ (int) r,(int)(start_brk-start_code),(int)text_len);
+ goto failed;
+ }
+
+ if (r < text_len) /* In text segment */
+ addr = r + start_code;
+ else /* In data segment */
+ addr = r - text_len + start_data;
+
+ /* Range checked already above so doing the range tests is redundant...*/
+ return(addr);
+
+failed:
+ abort();
+ return RELOC_FAILED;
+}
+
+/****************************************************************************/
+
+/* ??? This does not handle endianness correctly. */
+void old_reloc(struct lib_info *libinfo, uint32_t rl)
+{
+#ifdef DEBUG
+ char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
+#endif
+ uint32_t *ptr;
+ uint32_t offset;
+ int reloc_type;
+
+ offset = rl & 0x3fffffff;
+ reloc_type = rl >> 30;
+ /* ??? How to handle this? */
+#if defined(CONFIG_COLDFIRE)
+ ptr = (uint32_t *) (libinfo->start_code + offset);
+#else
+ ptr = (uint32_t *) (libinfo->start_data + offset);
+#endif
+
+#ifdef DEBUG
+ fprintf(stderr, "Relocation of variable at DATASEG+%x "
+ "(address %p, currently %x) into segment %s\n",
+ offset, ptr, (int)*ptr, segment[reloc_type]);
+#endif
+
+ switch (reloc_type) {
+ case OLD_FLAT_RELOC_TYPE_TEXT:
+ *ptr += libinfo->start_code;
+ break;
+ case OLD_FLAT_RELOC_TYPE_DATA:
+ *ptr += libinfo->start_data;
+ break;
+ case OLD_FLAT_RELOC_TYPE_BSS:
+ *ptr += libinfo->end_data;
+ break;
+ default:
+ fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n",
+ reloc_type);
+ break;
+ }
+ DBG_FLT("Relocation became %x\n", (int)*ptr);
+}
+
+/****************************************************************************/
+
+static int load_flat_file(struct linux_binprm * bprm,
+ struct lib_info *libinfo, int id, target_ulong *extra_stack)
+{
+ struct flat_hdr * hdr;
+ target_ulong textpos = 0, datapos = 0, result;
+ target_ulong realdatastart = 0;
+ target_ulong text_len, data_len, bss_len, stack_len, flags;
+ target_ulong memp = 0; /* for finding the brk area */
+ target_ulong extra;
+ target_ulong reloc = 0, rp;
+ int i, rev, relocs = 0;
+ target_ulong fpos;
+ target_ulong start_code, end_code;
+
+ hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
+
+ text_len = ntohl(hdr->data_start);
+ data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
+ bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
+ stack_len = ntohl(hdr->stack_size);
+ if (extra_stack) {
+ stack_len += *extra_stack;
+ *extra_stack = stack_len;
+ }
+ relocs = ntohl(hdr->reloc_count);
+ flags = ntohl(hdr->flags);
+ rev = ntohl(hdr->rev);
+
+ DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
+
+ if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
+ fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
+ rev, (int) FLAT_VERSION);
+ return -ENOEXEC;
+ }
+
+ /* Don't allow old format executables to use shared libraries */
+ if (rev == OLD_FLAT_VERSION && id != 0) {
+ fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n");
+ return -ENOEXEC;
+ }
+
+ /*
+ * fix up the flags for the older format, there were all kinds
+ * of endian hacks, this only works for the simple cases
+ */
+ if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
+ flags = FLAT_FLAG_RAM;
+
+#ifndef CONFIG_BINFMT_ZFLAT
+ if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
+ fprintf(stderr, "Support for ZFLAT executables is not enabled\n");
+ return -ENOEXEC;
+ }
+#endif
+
+ /*
+ * calculate the extra space we need to map in
+ */
+ extra = relocs * sizeof(target_ulong);
+ if (extra < bss_len + stack_len)
+ extra = bss_len + stack_len;
+
+ /*
+ * there are a couple of cases here, the separate code/data
+ * case, and then the fully copied to RAM case which lumps
+ * it all together.
+ */
+ if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
+ /*
+ * this should give us a ROM ptr, but if it doesn't we don't
+ * really care
+ */
+ DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
+
+ textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC,
+ MAP_PRIVATE, bprm->fd, 0);
+ if (textpos == -1) {
+ fprintf(stderr, "Unable to mmap process text\n");
+ return -1;
+ }
+
+ realdatastart = target_mmap(0, data_len + extra +
+ MAX_SHARED_LIBS * sizeof(target_ulong),
+ PROT_READ|PROT_WRITE|PROT_EXEC,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+ if (realdatastart == -1) {
+ fprintf(stderr, "Unable to allocate RAM for process data\n");
+ return realdatastart;
+ }
+ datapos = realdatastart + MAX_SHARED_LIBS * sizeof(target_ulong);
+
+ DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
+ (int)(data_len + bss_len + stack_len), (int)datapos);
+
+ fpos = ntohl(hdr->data_start);
+#ifdef CONFIG_BINFMT_ZFLAT
+ if (flags & FLAT_FLAG_GZDATA) {
+ result = decompress_exec(bprm, fpos, (char *) datapos,
+ data_len + (relocs * sizeof(target_ulong)))
+ } else
+#endif
+ {
+ result = target_pread(bprm->fd, datapos,
+ data_len + (relocs * sizeof(target_ulong)),
+ fpos);
+ }
+ if (result < 0) {
+ fprintf(stderr, "Unable to read data+bss\n");
+ return result;
+ }
+
+ reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
+ memp = realdatastart;
+
+ } else {
+
+ textpos = target_mmap(0, text_len + data_len + extra +
+ MAX_SHARED_LIBS * sizeof(target_ulong),
+ PROT_READ | PROT_EXEC | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if (textpos == -1 ) {
+ fprintf(stderr, "Unable to allocate RAM for process text/data\n");
+ return -1;
+ }
+
+ realdatastart = textpos + ntohl(hdr->data_start);
+ datapos = realdatastart + MAX_SHARED_LIBS * sizeof(target_ulong);
+ reloc = (textpos + ntohl(hdr->reloc_start) +
+ MAX_SHARED_LIBS * sizeof(target_ulong));
+ memp = textpos;
+
+#ifdef CONFIG_BINFMT_ZFLAT
+#error code needs checking
+ /*
+ * load it all in and treat it like a RAM load from now on
+ */
+ if (flags & FLAT_FLAG_GZIP) {
+ result = decompress_exec(bprm, sizeof (struct flat_hdr),
+ (((char *) textpos) + sizeof (struct flat_hdr)),
+ (text_len + data_len + (relocs * sizeof(unsigned long))
+ - sizeof (struct flat_hdr)),
+ 0);
+ memmove((void *) datapos, (void *) realdatastart,
+ data_len + (relocs * sizeof(unsigned long)));
+ } else if (flags & FLAT_FLAG_GZDATA) {
+ fpos = 0;
+ result = bprm->file->f_op->read(bprm->file,
+ (char *) textpos, text_len, &fpos);
+ if (result < (unsigned long) -4096)
+ result = decompress_exec(bprm, text_len, (char *) datapos,
+ data_len + (relocs * sizeof(unsigned long)), 0);
+ }
+ else
+#endif
+ {
+ result = target_pread(bprm->fd, textpos,
+ text_len, 0);
+ if (result >= 0) {
+ result = target_pread(bprm->fd, datapos,
+ data_len + (relocs * sizeof(target_ulong)),
+ ntohl(hdr->data_start));
+ }
+ }
+ if (result < 0) {
+ fprintf(stderr, "Unable to read code+data+bss\n");
+ return result;
+ }
+ }
+
+ DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n",
+ (int)textpos, 0x00ffffff&ntohl(hdr->entry),
+ ntohl(hdr->data_start));
+
+ /* The main program needs a little extra setup in the task structure */
+ start_code = textpos + sizeof (struct flat_hdr);
+ end_code = textpos + text_len;
+
+ DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
+ id ? "Lib" : "Load", bprm->filename,
+ (int) start_code, (int) end_code,
+ (int) datapos,
+ (int) (datapos + data_len),
+ (int) (datapos + data_len),
+ (int) (((datapos + data_len + bss_len) + 3) & ~3));
+
+ text_len -= sizeof(struct flat_hdr); /* the real code len */
+
+ /* Store the current module values into the global library structure */
+ libinfo[id].start_code = start_code;
+ libinfo[id].start_data = datapos;
+ libinfo[id].end_data = datapos + data_len;
+ libinfo[id].start_brk = datapos + data_len + bss_len;
+ libinfo[id].text_len = text_len;
+ libinfo[id].loaded = 1;
+ libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
+ libinfo[id].build_date = ntohl(hdr->build_date);
+
+ /*
+ * We just load the allocations into some temporary memory to
+ * help simplify all this mumbo jumbo
+ *
+ * We've got two different sections of relocation entries.
+ * The first is the GOT which resides at the begining of the data segment
+ * and is terminated with a -1. This one can be relocated in place.
+ * The second is the extra relocation entries tacked after the image's
+ * data segment. These require a little more processing as the entry is
+ * really an offset into the image which contains an offset into the
+ * image.
+ */
+ if (flags & FLAT_FLAG_GOTPIC) {
+ rp = datapos;
+ while (1) {
+ target_ulong addr;
+ addr = tgetl(rp);
+ if (addr == -1)
+ break;
+ if (addr) {
+ addr = calc_reloc(addr, libinfo, id, 0);
+ if (addr == RELOC_FAILED)
+ return -ENOEXEC;
+ tputl(rp, addr);
+ }
+ rp += sizeof(target_ulong);
+ }
+ }
+
+ /*
+ * Now run through the relocation entries.
+ * We've got to be careful here as C++ produces relocatable zero
+ * entries in the constructor and destructor tables which are then
+ * tested for being not zero (which will always occur unless we're
+ * based from address zero). This causes an endless loop as __start
+ * is at zero. The solution used is to not relocate zero addresses.
+ * This has the negative side effect of not allowing a global data
+ * reference to be statically initialised to _stext (I've moved
+ * __start to address 4 so that is okay).
+ */
+ if (rev > OLD_FLAT_VERSION) {
+ for (i = 0; i < relocs; i++) {
+ target_ulong addr, relval;
+
+ /* Get the address of the pointer to be
+ relocated (of course, the address has to be
+ relocated first). */
+ relval = tgetl(reloc + i * sizeof (target_ulong));
+ addr = flat_get_relocate_addr(relval);
+ rp = calc_reloc(addr, libinfo, id, 1);
+ if (rp == RELOC_FAILED)
+ return -ENOEXEC;
+
+ /* Get the pointer's value. */
+ addr = tgetl(rp);
+ if (addr != 0) {
+ /*
+ * Do the relocation. PIC relocs in the data section are
+ * already in target order
+ */
+
+#ifndef TARGET_WORDS_BIGENDIAN
+ if ((flags & FLAT_FLAG_GOTPIC) == 0)
+ addr = bswap32(addr);
+#endif
+ addr = calc_reloc(addr, libinfo, id, 0);
+ if (addr == RELOC_FAILED)
+ return -ENOEXEC;
+
+ /* Write back the relocated pointer. */
+ tputl(rp, addr);
+ }
+ }
+ } else {
+ for (i = 0; i < relocs; i++) {
+ target_ulong relval;
+ relval = tgetl(reloc + i * sizeof (target_ulong));
+ old_reloc(&libinfo[0], relval);
+ }
+ }
+
+ /* zero the BSS. */
+ memset((void*)(datapos + data_len), 0, bss_len);
+
+ return 0;
+}
+
+
+/****************************************************************************/
+#ifdef CONFIG_BINFMT_SHARED_FLAT
+
+/*
+ * Load a shared library into memory. The library gets its own data
+ * segment (including bss) but not argv/argc/environ.
+ */
+
+static int load_flat_shared_library(int id, struct lib_info *libs)
+{
+ struct linux_binprm bprm;
+ int res;
+ char buf[16];
+
+ /* Create the file name */
+ sprintf(buf, "/lib/lib%d.so", id);
+
+ /* Open the file up */
+ bprm.filename = buf;
+ bprm.file = open_exec(bprm.filename);
+ res = PTR_ERR(bprm.file);
+ if (IS_ERR(bprm.file))
+ return res;
+
+ res = prepare_binprm(&bprm);
+
+ if (res <= (unsigned long)-4096)
+ res = load_flat_file(&bprm, libs, id, NULL);
+ if (bprm.file) {
+ allow_write_access(bprm.file);
+ fput(bprm.file);
+ bprm.file = NULL;
+ }
+ return(res);
+}
+
+#endif /* CONFIG_BINFMT_SHARED_FLAT */
+
+int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
+ struct image_info * info)
+{
+ struct lib_info libinfo[MAX_SHARED_LIBS];
+ target_ulong p = bprm->p;
+ target_ulong stack_len;
+ target_ulong start_addr;
+ target_ulong sp;
+ int res;
+ int i, j;
+
+ memset(libinfo, 0, sizeof(libinfo));
+ /*
+ * We have to add the size of our arguments to our stack size
+ * otherwise it's too easy for users to create stack overflows
+ * by passing in a huge argument list. And yes, we have to be
+ * pedantic and include space for the argv/envp array as it may have
+ * a lot of entries.
+ */
+#define TOP_OF_ARGS (TARGET_PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *))
+ stack_len = TOP_OF_ARGS - bprm->p; /* the strings */
+ stack_len += (bprm->argc + 1) * 4; /* the argv array */
+ stack_len += (bprm->envc + 1) * 4; /* the envp array */
+
+
+ res = load_flat_file(bprm, libinfo, 0, &stack_len);
+ if (res > (unsigned long)-4096)
+ return res;
+
+ /* Update data segment pointers for all libraries */
+ for (i=0; i<MAX_SHARED_LIBS; i++) {
+ if (libinfo[i].loaded) {
+ target_ulong p;
+ p = libinfo[i].start_data;
+ for (j=0; j<MAX_SHARED_LIBS; j++) {
+ p -= 4;
+ tput32(p, libinfo[j].loaded
+ ? libinfo[j].start_data
+ : UNLOADED_LIB);
+ }
+ }
+ }
+
+ p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4;
+ DBG_FLT("p=%x\n", (int)p);
+
+ /* Copy argv/envp. */
+ p = copy_strings(p, bprm->argc, bprm->argv);
+ p = copy_strings(p, bprm->envc, bprm->envp);
+ /* Align stack. */
+ sp = p & ~(target_ulong)(sizeof(target_ulong) - 1);
+ sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p, 1);
+
+ /* Fake some return addresses to ensure the call chain will
+ * initialise library in order for us. We are required to call
+ * lib 1 first, then 2, ... and finally the main program (id 0).
+ */
+ start_addr = libinfo[0].entry;
+
+#ifdef CONFIG_BINFMT_SHARED_FLAT
+#error here
+ for (i = MAX_SHARED_LIBS-1; i>0; i--) {
+ if (libinfo[i].loaded) {
+ /* Push previos first to call address */
+ --sp; put_user(start_addr, sp);
+ start_addr = libinfo[i].entry;
+ }
+ }
+#endif
+
+ /* Stash our initial stack pointer into the mm structure */
+ info->start_code = libinfo[0].start_code;
+ info->end_code = libinfo[0].start_code = libinfo[0].text_len;
+ info->start_data = libinfo[0].start_data;
+ info->end_data = libinfo[0].end_data;
+ info->start_brk = libinfo[0].start_brk;
+ info->start_stack = sp;
+ info->entry = start_addr;
+ DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
+ (int)info->entry, (int)info->start_stack);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-17 06:42:23 +0000