1e5fe0c52Spbrook /****************************************************************************/
2e5fe0c52Spbrook /*
3e5fe0c52Spbrook * QEMU bFLT binary loader. Based on linux/fs/binfmt_flat.c
4e5fe0c52Spbrook *
5e5fe0c52Spbrook * This program is free software; you can redistribute it and/or modify
6e5fe0c52Spbrook * it under the terms of the GNU General Public License as published by
7e5fe0c52Spbrook * the Free Software Foundation; either version 2 of the License, or
8e5fe0c52Spbrook * (at your option) any later version.
9e5fe0c52Spbrook *
10e5fe0c52Spbrook * This program is distributed in the hope that it will be useful,
11e5fe0c52Spbrook * but WITHOUT ANY WARRANTY; without even the implied warranty of
12e5fe0c52Spbrook * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13e5fe0c52Spbrook * GNU General Public License for more details.
14e5fe0c52Spbrook *
15e5fe0c52Spbrook * You should have received a copy of the GNU General Public License
168167ee88SBlue Swirl * along with this program; if not, see <http://www.gnu.org/licenses/>.
17e5fe0c52Spbrook *
18e5fe0c52Spbrook * Copyright (C) 2006 CodeSourcery.
19e5fe0c52Spbrook * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com>
20e5fe0c52Spbrook * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
21e5fe0c52Spbrook * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com>
22e5fe0c52Spbrook * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com>
23e5fe0c52Spbrook * based heavily on:
24e5fe0c52Spbrook *
25e5fe0c52Spbrook * linux/fs/binfmt_aout.c:
26e5fe0c52Spbrook * Copyright (C) 1991, 1992, 1996 Linus Torvalds
27e5fe0c52Spbrook * linux/fs/binfmt_flat.c for 2.0 kernel
28e5fe0c52Spbrook * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
29e5fe0c52Spbrook * JAN/99 -- coded full program relocation (gerg@snapgear.com)
30e5fe0c52Spbrook */
31e5fe0c52Spbrook
32e5fe0c52Spbrook /* ??? ZFLAT and shared library support is currently disabled. */
33e5fe0c52Spbrook
34e5fe0c52Spbrook /****************************************************************************/
35e5fe0c52Spbrook
36d39594e9SPeter Maydell #include "qemu/osdep.h"
37e5fe0c52Spbrook
38e5fe0c52Spbrook #include "qemu.h"
393b249d26SPeter Maydell #include "user-internals.h"
403ad0a769SPeter Maydell #include "loader.h"
415423e6d3SPeter Maydell #include "user-mmap.h"
42e5fe0c52Spbrook #include "flat.h"
4394db8de1SPeter Maydell #include "target_flat.h"
44e5fe0c52Spbrook
45e5fe0c52Spbrook //#define DEBUG
46e5fe0c52Spbrook
47e5fe0c52Spbrook #ifdef DEBUG
48001faf32SBlue Swirl #define DBG_FLT(...) printf(__VA_ARGS__)
49e5fe0c52Spbrook #else
50001faf32SBlue Swirl #define DBG_FLT(...)
51e5fe0c52Spbrook #endif
52e5fe0c52Spbrook
53e5fe0c52Spbrook #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
54e5fe0c52Spbrook #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
55e5fe0c52Spbrook
56e5fe0c52Spbrook struct lib_info {
57992f48a0Sblueswir1 abi_ulong start_code; /* Start of text segment */
58992f48a0Sblueswir1 abi_ulong start_data; /* Start of data segment */
59992f48a0Sblueswir1 abi_ulong end_data; /* Start of bss section */
60992f48a0Sblueswir1 abi_ulong start_brk; /* End of data segment */
61992f48a0Sblueswir1 abi_ulong text_len; /* Length of text segment */
62992f48a0Sblueswir1 abi_ulong entry; /* Start address for this module */
63992f48a0Sblueswir1 abi_ulong build_date; /* When this one was compiled */
64e5fe0c52Spbrook short loaded; /* Has this library been loaded? */
65e5fe0c52Spbrook };
66e5fe0c52Spbrook
67e5fe0c52Spbrook #ifdef CONFIG_BINFMT_SHARED_FLAT
68e5fe0c52Spbrook static int load_flat_shared_library(int id, struct lib_info *p);
69e5fe0c52Spbrook #endif
70e5fe0c52Spbrook
71e5fe0c52Spbrook struct linux_binprm;
72e5fe0c52Spbrook
73e5fe0c52Spbrook /****************************************************************************/
74e5fe0c52Spbrook /*
75e5fe0c52Spbrook * create_flat_tables() parses the env- and arg-strings in new user
76e5fe0c52Spbrook * memory and creates the pointer tables from them, and puts their
77e5fe0c52Spbrook * addresses on the "stack", returning the new stack pointer value.
78e5fe0c52Spbrook */
79e5fe0c52Spbrook
80e5fe0c52Spbrook /* Push a block of strings onto the guest stack. */
copy_strings(abi_ulong p,int n,char ** s)81992f48a0Sblueswir1 static abi_ulong copy_strings(abi_ulong p, int n, char **s)
82e5fe0c52Spbrook {
83e5fe0c52Spbrook int len;
84e5fe0c52Spbrook
85e5fe0c52Spbrook while (n-- > 0) {
86e5fe0c52Spbrook len = strlen(s[n]) + 1;
87e5fe0c52Spbrook p -= len;
88e5fe0c52Spbrook memcpy_to_target(p, s[n], len);
89e5fe0c52Spbrook }
90e5fe0c52Spbrook
91e5fe0c52Spbrook return p;
92e5fe0c52Spbrook }
93e5fe0c52Spbrook
target_pread(int fd,abi_ulong ptr,abi_ulong len,abi_ulong offset)94b1d8e52eSblueswir1 static int target_pread(int fd, abi_ulong ptr, abi_ulong len,
95992f48a0Sblueswir1 abi_ulong offset)
96e5fe0c52Spbrook {
97e5fe0c52Spbrook void *buf;
98e5fe0c52Spbrook int ret;
99e5fe0c52Spbrook
100579a97f7Sbellard buf = lock_user(VERIFY_WRITE, ptr, len, 0);
101e5a869edSPeter Maydell if (!buf) {
102e5a869edSPeter Maydell return -EFAULT;
103e5a869edSPeter Maydell }
104e5fe0c52Spbrook ret = pread(fd, buf, len, offset);
105e5a869edSPeter Maydell if (ret < 0) {
106e5a869edSPeter Maydell ret = -errno;
107e5a869edSPeter Maydell }
108e5fe0c52Spbrook unlock_user(buf, ptr, len);
109e5fe0c52Spbrook return ret;
110e5fe0c52Spbrook }
111e5fe0c52Spbrook /****************************************************************************/
112e5fe0c52Spbrook
113e5fe0c52Spbrook #ifdef CONFIG_BINFMT_ZFLAT
114e5fe0c52Spbrook
115e5fe0c52Spbrook #include <linux/zlib.h>
116e5fe0c52Spbrook
117e5fe0c52Spbrook #define LBUFSIZE 4000
118e5fe0c52Spbrook
119e5fe0c52Spbrook /* gzip flag byte */
120e5fe0c52Spbrook #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
121e5fe0c52Spbrook #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
122e5fe0c52Spbrook #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
123e5fe0c52Spbrook #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
124e5fe0c52Spbrook #define COMMENT 0x10 /* bit 4 set: file comment present */
125e5fe0c52Spbrook #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
126e5fe0c52Spbrook #define RESERVED 0xC0 /* bit 6,7: reserved */
127e5fe0c52Spbrook
decompress_exec(struct linux_binprm * bprm,unsigned long offset,char * dst,long len,int fd)128e5fe0c52Spbrook static int decompress_exec(
129e5fe0c52Spbrook struct linux_binprm *bprm,
130e5fe0c52Spbrook unsigned long offset,
131e5fe0c52Spbrook char *dst,
132e5fe0c52Spbrook long len,
133e5fe0c52Spbrook int fd)
134e5fe0c52Spbrook {
135e5fe0c52Spbrook unsigned char *buf;
136e5fe0c52Spbrook z_stream strm;
137e5fe0c52Spbrook loff_t fpos;
138e5fe0c52Spbrook int ret, retval;
139e5fe0c52Spbrook
140e5fe0c52Spbrook DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
141e5fe0c52Spbrook
142e5fe0c52Spbrook memset(&strm, 0, sizeof(strm));
143e5fe0c52Spbrook strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
144e5fe0c52Spbrook if (strm.workspace == NULL) {
145e5fe0c52Spbrook DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
146e5fe0c52Spbrook return -ENOMEM;
147e5fe0c52Spbrook }
148e5fe0c52Spbrook buf = kmalloc(LBUFSIZE, GFP_KERNEL);
149e5fe0c52Spbrook if (buf == NULL) {
150e5fe0c52Spbrook DBG_FLT("binfmt_flat: no memory for read buffer\n");
151e5fe0c52Spbrook retval = -ENOMEM;
152e5fe0c52Spbrook goto out_free;
153e5fe0c52Spbrook }
154e5fe0c52Spbrook
155e5fe0c52Spbrook /* Read in first chunk of data and parse gzip header. */
156e5fe0c52Spbrook fpos = offset;
157e5fe0c52Spbrook ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
158e5fe0c52Spbrook
159e5fe0c52Spbrook strm.next_in = buf;
160e5fe0c52Spbrook strm.avail_in = ret;
161e5fe0c52Spbrook strm.total_in = 0;
162e5fe0c52Spbrook
163e5fe0c52Spbrook retval = -ENOEXEC;
164e5fe0c52Spbrook
165e5fe0c52Spbrook /* Check minimum size -- gzip header */
166e5fe0c52Spbrook if (ret < 10) {
167e5fe0c52Spbrook DBG_FLT("binfmt_flat: file too small?\n");
168e5fe0c52Spbrook goto out_free_buf;
169e5fe0c52Spbrook }
170e5fe0c52Spbrook
171e5fe0c52Spbrook /* Check gzip magic number */
172e5fe0c52Spbrook if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
173e5fe0c52Spbrook DBG_FLT("binfmt_flat: unknown compression magic?\n");
174e5fe0c52Spbrook goto out_free_buf;
175e5fe0c52Spbrook }
176e5fe0c52Spbrook
177e5fe0c52Spbrook /* Check gzip method */
178e5fe0c52Spbrook if (buf[2] != 8) {
179e5fe0c52Spbrook DBG_FLT("binfmt_flat: unknown compression method?\n");
180e5fe0c52Spbrook goto out_free_buf;
181e5fe0c52Spbrook }
182e5fe0c52Spbrook /* Check gzip flags */
183e5fe0c52Spbrook if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
184e5fe0c52Spbrook (buf[3] & RESERVED)) {
185e5fe0c52Spbrook DBG_FLT("binfmt_flat: unknown flags?\n");
186e5fe0c52Spbrook goto out_free_buf;
187e5fe0c52Spbrook }
188e5fe0c52Spbrook
189e5fe0c52Spbrook ret = 10;
190e5fe0c52Spbrook if (buf[3] & EXTRA_FIELD) {
191e5fe0c52Spbrook ret += 2 + buf[10] + (buf[11] << 8);
192e5fe0c52Spbrook if (unlikely(LBUFSIZE == ret)) {
193e5fe0c52Spbrook DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
194e5fe0c52Spbrook goto out_free_buf;
195e5fe0c52Spbrook }
196e5fe0c52Spbrook }
197e5fe0c52Spbrook if (buf[3] & ORIG_NAME) {
198e5fe0c52Spbrook for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
199e5fe0c52Spbrook ;
200e5fe0c52Spbrook if (unlikely(LBUFSIZE == ret)) {
201e5fe0c52Spbrook DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
202e5fe0c52Spbrook goto out_free_buf;
203e5fe0c52Spbrook }
204e5fe0c52Spbrook }
205e5fe0c52Spbrook if (buf[3] & COMMENT) {
206e5fe0c52Spbrook for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
207e5fe0c52Spbrook ;
208e5fe0c52Spbrook if (unlikely(LBUFSIZE == ret)) {
209e5fe0c52Spbrook DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
210e5fe0c52Spbrook goto out_free_buf;
211e5fe0c52Spbrook }
212e5fe0c52Spbrook }
213e5fe0c52Spbrook
214e5fe0c52Spbrook strm.next_in += ret;
215e5fe0c52Spbrook strm.avail_in -= ret;
216e5fe0c52Spbrook
217e5fe0c52Spbrook strm.next_out = dst;
218e5fe0c52Spbrook strm.avail_out = len;
219e5fe0c52Spbrook strm.total_out = 0;
220e5fe0c52Spbrook
221e5fe0c52Spbrook if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
222e5fe0c52Spbrook DBG_FLT("binfmt_flat: zlib init failed?\n");
223e5fe0c52Spbrook goto out_free_buf;
224e5fe0c52Spbrook }
225e5fe0c52Spbrook
226e5fe0c52Spbrook while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
227e5fe0c52Spbrook ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
228e5fe0c52Spbrook if (ret <= 0)
229e5fe0c52Spbrook break;
23071987b12SPhilippe Mathieu-Daudé if (is_error(ret)) {
231e5fe0c52Spbrook break;
23271987b12SPhilippe Mathieu-Daudé }
233e5fe0c52Spbrook len -= ret;
234e5fe0c52Spbrook
235e5fe0c52Spbrook strm.next_in = buf;
236e5fe0c52Spbrook strm.avail_in = ret;
237e5fe0c52Spbrook strm.total_in = 0;
238e5fe0c52Spbrook }
239e5fe0c52Spbrook
240e5fe0c52Spbrook if (ret < 0) {
241e5fe0c52Spbrook DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
242e5fe0c52Spbrook ret, strm.msg);
243e5fe0c52Spbrook goto out_zlib;
244e5fe0c52Spbrook }
245e5fe0c52Spbrook
246e5fe0c52Spbrook retval = 0;
247e5fe0c52Spbrook out_zlib:
248e5fe0c52Spbrook zlib_inflateEnd(&strm);
249e5fe0c52Spbrook out_free_buf:
250e5fe0c52Spbrook kfree(buf);
251e5fe0c52Spbrook out_free:
252e5fe0c52Spbrook kfree(strm.workspace);
253e5fe0c52Spbrook out:
254e5fe0c52Spbrook return retval;
255e5fe0c52Spbrook }
256e5fe0c52Spbrook
257e5fe0c52Spbrook #endif /* CONFIG_BINFMT_ZFLAT */
258e5fe0c52Spbrook
259e5fe0c52Spbrook /****************************************************************************/
260e5fe0c52Spbrook
261992f48a0Sblueswir1 static abi_ulong
calc_reloc(abi_ulong r,struct lib_info * p,int curid,int internalp)262992f48a0Sblueswir1 calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp)
263e5fe0c52Spbrook {
264992f48a0Sblueswir1 abi_ulong addr;
265e5fe0c52Spbrook int id;
266992f48a0Sblueswir1 abi_ulong start_brk;
267992f48a0Sblueswir1 abi_ulong start_data;
268992f48a0Sblueswir1 abi_ulong text_len;
269992f48a0Sblueswir1 abi_ulong start_code;
270e5fe0c52Spbrook
271e5fe0c52Spbrook #ifdef CONFIG_BINFMT_SHARED_FLAT
272e5fe0c52Spbrook #error needs checking
273e5fe0c52Spbrook if (r == 0)
274e5fe0c52Spbrook id = curid; /* Relocs of 0 are always self referring */
275e5fe0c52Spbrook else {
276e5fe0c52Spbrook id = (r >> 24) & 0xff; /* Find ID for this reloc */
277e5fe0c52Spbrook r &= 0x00ffffff; /* Trim ID off here */
278e5fe0c52Spbrook }
279e5fe0c52Spbrook if (id >= MAX_SHARED_LIBS) {
280e5fe0c52Spbrook fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n",
281e5fe0c52Spbrook (unsigned) r, id);
282e5fe0c52Spbrook goto failed;
283e5fe0c52Spbrook }
284e5fe0c52Spbrook if (curid != id) {
285e5fe0c52Spbrook if (internalp) {
286e5fe0c52Spbrook fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not "
287e5fe0c52Spbrook "in same module (%d != %d)\n",
288e5fe0c52Spbrook (unsigned) r, curid, id);
289e5fe0c52Spbrook goto failed;
29071987b12SPhilippe Mathieu-Daudé } else if (!p[id].loaded && is_error(load_flat_shared_library(id, p))) {
291e5fe0c52Spbrook fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id);
292e5fe0c52Spbrook goto failed;
293e5fe0c52Spbrook }
294e5fe0c52Spbrook /* Check versioning information (i.e. time stamps) */
295e5fe0c52Spbrook if (p[id].build_date && p[curid].build_date
296e5fe0c52Spbrook && p[curid].build_date < p[id].build_date) {
297e5fe0c52Spbrook fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n",
298e5fe0c52Spbrook id, curid);
299e5fe0c52Spbrook goto failed;
300e5fe0c52Spbrook }
301e5fe0c52Spbrook }
302e5fe0c52Spbrook #else
303e5fe0c52Spbrook id = 0;
304e5fe0c52Spbrook #endif
305e5fe0c52Spbrook
306e5fe0c52Spbrook start_brk = p[id].start_brk;
307e5fe0c52Spbrook start_data = p[id].start_data;
308e5fe0c52Spbrook start_code = p[id].start_code;
309e5fe0c52Spbrook text_len = p[id].text_len;
310e5fe0c52Spbrook
311e5fe0c52Spbrook if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
312e5fe0c52Spbrook fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x "
313e5fe0c52Spbrook "(0 - 0x%x/0x%x)\n",
314e5fe0c52Spbrook (int) r,(int)(start_brk-start_code),(int)text_len);
315e5fe0c52Spbrook goto failed;
316e5fe0c52Spbrook }
317e5fe0c52Spbrook
318e5fe0c52Spbrook if (r < text_len) /* In text segment */
319e5fe0c52Spbrook addr = r + start_code;
320e5fe0c52Spbrook else /* In data segment */
321e5fe0c52Spbrook addr = r - text_len + start_data;
322e5fe0c52Spbrook
323e5fe0c52Spbrook /* Range checked already above so doing the range tests is redundant...*/
324e5fe0c52Spbrook return(addr);
325e5fe0c52Spbrook
326e5fe0c52Spbrook failed:
327e5fe0c52Spbrook abort();
328e5fe0c52Spbrook return RELOC_FAILED;
329e5fe0c52Spbrook }
330e5fe0c52Spbrook
331e5fe0c52Spbrook /****************************************************************************/
332e5fe0c52Spbrook
333e5fe0c52Spbrook /* ??? This does not handle endianness correctly. */
old_reloc(struct lib_info * libinfo,uint32_t rl)334b1d8e52eSblueswir1 static void old_reloc(struct lib_info *libinfo, uint32_t rl)
335e5fe0c52Spbrook {
336e5fe0c52Spbrook #ifdef DEBUG
337564e2fe8SRiccardo Magliocchetti const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
338e5fe0c52Spbrook #endif
339e5fe0c52Spbrook uint32_t *ptr;
340e5fe0c52Spbrook uint32_t offset;
341e5fe0c52Spbrook int reloc_type;
342e5fe0c52Spbrook
343e5fe0c52Spbrook offset = rl & 0x3fffffff;
344e5fe0c52Spbrook reloc_type = rl >> 30;
345e5fe0c52Spbrook /* ??? How to handle this? */
346e5fe0c52Spbrook #if defined(CONFIG_COLDFIRE)
347526ccb7aSbalrog ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset);
348e5fe0c52Spbrook #else
349526ccb7aSbalrog ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset);
350e5fe0c52Spbrook #endif
351e5fe0c52Spbrook
352e5fe0c52Spbrook #ifdef DEBUG
353e5fe0c52Spbrook fprintf(stderr, "Relocation of variable at DATASEG+%x "
354e5fe0c52Spbrook "(address %p, currently %x) into segment %s\n",
355e5fe0c52Spbrook offset, ptr, (int)*ptr, segment[reloc_type]);
356e5fe0c52Spbrook #endif
357e5fe0c52Spbrook
358e5fe0c52Spbrook switch (reloc_type) {
359e5fe0c52Spbrook case OLD_FLAT_RELOC_TYPE_TEXT:
360e5fe0c52Spbrook *ptr += libinfo->start_code;
361e5fe0c52Spbrook break;
362e5fe0c52Spbrook case OLD_FLAT_RELOC_TYPE_DATA:
363e5fe0c52Spbrook *ptr += libinfo->start_data;
364e5fe0c52Spbrook break;
365e5fe0c52Spbrook case OLD_FLAT_RELOC_TYPE_BSS:
366e5fe0c52Spbrook *ptr += libinfo->end_data;
367e5fe0c52Spbrook break;
368e5fe0c52Spbrook default:
369e5fe0c52Spbrook fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n",
370e5fe0c52Spbrook reloc_type);
371e5fe0c52Spbrook break;
372e5fe0c52Spbrook }
373e5fe0c52Spbrook DBG_FLT("Relocation became %x\n", (int)*ptr);
374e5fe0c52Spbrook }
375e5fe0c52Spbrook
376e5fe0c52Spbrook /****************************************************************************/
377e5fe0c52Spbrook
load_flat_file(struct linux_binprm * bprm,struct lib_info * libinfo,int id,abi_ulong * extra_stack)378e5fe0c52Spbrook static int load_flat_file(struct linux_binprm * bprm,
379992f48a0Sblueswir1 struct lib_info *libinfo, int id, abi_ulong *extra_stack)
380e5fe0c52Spbrook {
381e5fe0c52Spbrook struct flat_hdr * hdr;
382f562e716SBlue Swirl abi_ulong textpos = 0, datapos = 0;
383f562e716SBlue Swirl abi_long result;
384992f48a0Sblueswir1 abi_ulong realdatastart = 0;
385992f48a0Sblueswir1 abi_ulong text_len, data_len, bss_len, stack_len, flags;
386992f48a0Sblueswir1 abi_ulong extra;
387992f48a0Sblueswir1 abi_ulong reloc = 0, rp;
388e5fe0c52Spbrook int i, rev, relocs = 0;
389992f48a0Sblueswir1 abi_ulong fpos;
390e7730352SJuan Quintela abi_ulong start_code;
391992f48a0Sblueswir1 abi_ulong indx_len;
392e5fe0c52Spbrook
393e5fe0c52Spbrook hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
394e5fe0c52Spbrook
395e5fe0c52Spbrook text_len = ntohl(hdr->data_start);
396e5fe0c52Spbrook data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
397e5fe0c52Spbrook bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
398e5fe0c52Spbrook stack_len = ntohl(hdr->stack_size);
399e5fe0c52Spbrook if (extra_stack) {
400e5fe0c52Spbrook stack_len += *extra_stack;
401e5fe0c52Spbrook *extra_stack = stack_len;
402e5fe0c52Spbrook }
403e5fe0c52Spbrook relocs = ntohl(hdr->reloc_count);
404e5fe0c52Spbrook flags = ntohl(hdr->flags);
405e5fe0c52Spbrook rev = ntohl(hdr->rev);
406e5fe0c52Spbrook
407e5fe0c52Spbrook DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
408e5fe0c52Spbrook
409e5fe0c52Spbrook if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
410e5fe0c52Spbrook fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
411e5fe0c52Spbrook rev, (int) FLAT_VERSION);
412e5fe0c52Spbrook return -ENOEXEC;
413e5fe0c52Spbrook }
414e5fe0c52Spbrook
415e5fe0c52Spbrook /* Don't allow old format executables to use shared libraries */
416e5fe0c52Spbrook if (rev == OLD_FLAT_VERSION && id != 0) {
417e5fe0c52Spbrook fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n");
418e5fe0c52Spbrook return -ENOEXEC;
419e5fe0c52Spbrook }
420e5fe0c52Spbrook
421e5fe0c52Spbrook /*
422e5fe0c52Spbrook * fix up the flags for the older format, there were all kinds
423e5fe0c52Spbrook * of endian hacks, this only works for the simple cases
424e5fe0c52Spbrook */
425e5fe0c52Spbrook if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
426e5fe0c52Spbrook flags = FLAT_FLAG_RAM;
427e5fe0c52Spbrook
428e5fe0c52Spbrook #ifndef CONFIG_BINFMT_ZFLAT
429e5fe0c52Spbrook if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
430e5fe0c52Spbrook fprintf(stderr, "Support for ZFLAT executables is not enabled\n");
431e5fe0c52Spbrook return -ENOEXEC;
432e5fe0c52Spbrook }
433e5fe0c52Spbrook #endif
434e5fe0c52Spbrook
435e5fe0c52Spbrook /*
436e5fe0c52Spbrook * calculate the extra space we need to map in
437e5fe0c52Spbrook */
438992f48a0Sblueswir1 extra = relocs * sizeof(abi_ulong);
439e5fe0c52Spbrook if (extra < bss_len + stack_len)
440e5fe0c52Spbrook extra = bss_len + stack_len;
441e5fe0c52Spbrook
4422a1094cdSpbrook /* Add space for library base pointers. Make sure this does not
4432a1094cdSpbrook misalign the doesn't misalign the data segment. */
444992f48a0Sblueswir1 indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong);
445992f48a0Sblueswir1 indx_len = (indx_len + 15) & ~(abi_ulong)15;
4462a1094cdSpbrook
447e5fe0c52Spbrook /*
4486f9ff551Szhaolichang * Allocate the address space.
449ee947430SAlex Bennée */
450ee947430SAlex Bennée probe_guest_base(bprm->filename, 0,
451a3a67f54SRichard Henderson text_len + data_len + extra + indx_len - 1);
452ee947430SAlex Bennée
453ee947430SAlex Bennée /*
454e5fe0c52Spbrook * there are a couple of cases here, the separate code/data
455e5fe0c52Spbrook * case, and then the fully copied to RAM case which lumps
456e5fe0c52Spbrook * it all together.
457e5fe0c52Spbrook */
458e5fe0c52Spbrook if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
459e5fe0c52Spbrook /*
460e5fe0c52Spbrook * this should give us a ROM ptr, but if it doesn't we don't
461e5fe0c52Spbrook * really care
462e5fe0c52Spbrook */
463e5fe0c52Spbrook DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
464e5fe0c52Spbrook
465e5fe0c52Spbrook textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC,
466*d0b6b793SRichard Henderson MAP_PRIVATE, bprm->src.fd, 0);
467e5fe0c52Spbrook if (textpos == -1) {
468e5fe0c52Spbrook fprintf(stderr, "Unable to mmap process text\n");
469e5fe0c52Spbrook return -1;
470e5fe0c52Spbrook }
471e5fe0c52Spbrook
4722a1094cdSpbrook realdatastart = target_mmap(0, data_len + extra + indx_len,
473e5fe0c52Spbrook PROT_READ|PROT_WRITE|PROT_EXEC,
474e5fe0c52Spbrook MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
475e5fe0c52Spbrook
476e5fe0c52Spbrook if (realdatastart == -1) {
477e5fe0c52Spbrook fprintf(stderr, "Unable to allocate RAM for process data\n");
478e5fe0c52Spbrook return realdatastart;
479e5fe0c52Spbrook }
4802a1094cdSpbrook datapos = realdatastart + indx_len;
481e5fe0c52Spbrook
482e5fe0c52Spbrook DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
483e5fe0c52Spbrook (int)(data_len + bss_len + stack_len), (int)datapos);
484e5fe0c52Spbrook
485e5fe0c52Spbrook fpos = ntohl(hdr->data_start);
486e5fe0c52Spbrook #ifdef CONFIG_BINFMT_ZFLAT
487e5fe0c52Spbrook if (flags & FLAT_FLAG_GZDATA) {
488e5fe0c52Spbrook result = decompress_exec(bprm, fpos, (char *) datapos,
489992f48a0Sblueswir1 data_len + (relocs * sizeof(abi_ulong)))
490e5fe0c52Spbrook } else
491e5fe0c52Spbrook #endif
492e5fe0c52Spbrook {
493*d0b6b793SRichard Henderson result = target_pread(bprm->src.fd, datapos,
494992f48a0Sblueswir1 data_len + (relocs * sizeof(abi_ulong)),
495e5fe0c52Spbrook fpos);
496e5fe0c52Spbrook }
497e5fe0c52Spbrook if (result < 0) {
498e5fe0c52Spbrook fprintf(stderr, "Unable to read data+bss\n");
499e5fe0c52Spbrook return result;
500e5fe0c52Spbrook }
501e5fe0c52Spbrook
502e5fe0c52Spbrook reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
503e5fe0c52Spbrook
504e5fe0c52Spbrook } else {
505e5fe0c52Spbrook
5062a1094cdSpbrook textpos = target_mmap(0, text_len + data_len + extra + indx_len,
507e5fe0c52Spbrook PROT_READ | PROT_EXEC | PROT_WRITE,
508e5fe0c52Spbrook MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
509e5fe0c52Spbrook if (textpos == -1 ) {
510e5fe0c52Spbrook fprintf(stderr, "Unable to allocate RAM for process text/data\n");
511e5fe0c52Spbrook return -1;
512e5fe0c52Spbrook }
513e5fe0c52Spbrook
514e5fe0c52Spbrook realdatastart = textpos + ntohl(hdr->data_start);
5152a1094cdSpbrook datapos = realdatastart + indx_len;
5162a1094cdSpbrook reloc = (textpos + ntohl(hdr->reloc_start) + indx_len);
517e5fe0c52Spbrook
518e5fe0c52Spbrook #ifdef CONFIG_BINFMT_ZFLAT
519e5fe0c52Spbrook #error code needs checking
520e5fe0c52Spbrook /*
521e5fe0c52Spbrook * load it all in and treat it like a RAM load from now on
522e5fe0c52Spbrook */
523e5fe0c52Spbrook if (flags & FLAT_FLAG_GZIP) {
524e5fe0c52Spbrook result = decompress_exec(bprm, sizeof (struct flat_hdr),
525e5fe0c52Spbrook (((char *) textpos) + sizeof (struct flat_hdr)),
526e5fe0c52Spbrook (text_len + data_len + (relocs * sizeof(unsigned long))
527e5fe0c52Spbrook - sizeof (struct flat_hdr)),
528e5fe0c52Spbrook 0);
529e5fe0c52Spbrook memmove((void *) datapos, (void *) realdatastart,
530e5fe0c52Spbrook data_len + (relocs * sizeof(unsigned long)));
531e5fe0c52Spbrook } else if (flags & FLAT_FLAG_GZDATA) {
532e5fe0c52Spbrook fpos = 0;
533e5fe0c52Spbrook result = bprm->file->f_op->read(bprm->file,
534e5fe0c52Spbrook (char *) textpos, text_len, &fpos);
53571987b12SPhilippe Mathieu-Daudé if (!is_error(result)) {
536e5fe0c52Spbrook result = decompress_exec(bprm, text_len, (char *) datapos,
537e5fe0c52Spbrook data_len + (relocs * sizeof(unsigned long)), 0);
538e5fe0c52Spbrook }
53971987b12SPhilippe Mathieu-Daudé }
540e5fe0c52Spbrook else
541e5fe0c52Spbrook #endif
542e5fe0c52Spbrook {
543*d0b6b793SRichard Henderson result = target_pread(bprm->src.fd, textpos,
544e5fe0c52Spbrook text_len, 0);
545e5fe0c52Spbrook if (result >= 0) {
546*d0b6b793SRichard Henderson result = target_pread(bprm->src.fd, datapos,
547992f48a0Sblueswir1 data_len + (relocs * sizeof(abi_ulong)),
548e5fe0c52Spbrook ntohl(hdr->data_start));
549e5fe0c52Spbrook }
550e5fe0c52Spbrook }
551e5fe0c52Spbrook if (result < 0) {
552e5fe0c52Spbrook fprintf(stderr, "Unable to read code+data+bss\n");
553e5fe0c52Spbrook return result;
554e5fe0c52Spbrook }
555e5fe0c52Spbrook }
556e5fe0c52Spbrook
557e5fe0c52Spbrook DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n",
558e5fe0c52Spbrook (int)textpos, 0x00ffffff&ntohl(hdr->entry),
559e5fe0c52Spbrook ntohl(hdr->data_start));
560e5fe0c52Spbrook
561e5fe0c52Spbrook /* The main program needs a little extra setup in the task structure */
562e5fe0c52Spbrook start_code = textpos + sizeof (struct flat_hdr);
563e5fe0c52Spbrook
564e5fe0c52Spbrook DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
565e5fe0c52Spbrook id ? "Lib" : "Load", bprm->filename,
566e7730352SJuan Quintela (int) start_code, (int) (textpos + text_len),
567e5fe0c52Spbrook (int) datapos,
568e5fe0c52Spbrook (int) (datapos + data_len),
569e5fe0c52Spbrook (int) (datapos + data_len),
570e5fe0c52Spbrook (int) (((datapos + data_len + bss_len) + 3) & ~3));
571e5fe0c52Spbrook
572e5fe0c52Spbrook text_len -= sizeof(struct flat_hdr); /* the real code len */
573e5fe0c52Spbrook
574e5fe0c52Spbrook /* Store the current module values into the global library structure */
575e5fe0c52Spbrook libinfo[id].start_code = start_code;
576e5fe0c52Spbrook libinfo[id].start_data = datapos;
577e5fe0c52Spbrook libinfo[id].end_data = datapos + data_len;
578e5fe0c52Spbrook libinfo[id].start_brk = datapos + data_len + bss_len;
579e5fe0c52Spbrook libinfo[id].text_len = text_len;
580e5fe0c52Spbrook libinfo[id].loaded = 1;
581e5fe0c52Spbrook libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
582e5fe0c52Spbrook libinfo[id].build_date = ntohl(hdr->build_date);
583e5fe0c52Spbrook
584e5fe0c52Spbrook /*
585e5fe0c52Spbrook * We just load the allocations into some temporary memory to
586e5fe0c52Spbrook * help simplify all this mumbo jumbo
587e5fe0c52Spbrook *
588e5fe0c52Spbrook * We've got two different sections of relocation entries.
589b4916d7bSDong Xu Wang * The first is the GOT which resides at the beginning of the data segment
590e5fe0c52Spbrook * and is terminated with a -1. This one can be relocated in place.
591e5fe0c52Spbrook * The second is the extra relocation entries tacked after the image's
592e5fe0c52Spbrook * data segment. These require a little more processing as the entry is
593e5fe0c52Spbrook * really an offset into the image which contains an offset into the
594e5fe0c52Spbrook * image.
595e5fe0c52Spbrook */
596e5fe0c52Spbrook if (flags & FLAT_FLAG_GOTPIC) {
597e5fe0c52Spbrook rp = datapos;
598e5fe0c52Spbrook while (1) {
599992f48a0Sblueswir1 abi_ulong addr;
6002f619698Sbellard if (get_user_ual(addr, rp))
6012f619698Sbellard return -EFAULT;
602e5fe0c52Spbrook if (addr == -1)
603e5fe0c52Spbrook break;
604e5fe0c52Spbrook if (addr) {
605e5fe0c52Spbrook addr = calc_reloc(addr, libinfo, id, 0);
606e5fe0c52Spbrook if (addr == RELOC_FAILED)
607e5fe0c52Spbrook return -ENOEXEC;
6082f619698Sbellard if (put_user_ual(addr, rp))
6092f619698Sbellard return -EFAULT;
610e5fe0c52Spbrook }
611992f48a0Sblueswir1 rp += sizeof(abi_ulong);
612e5fe0c52Spbrook }
613e5fe0c52Spbrook }
614e5fe0c52Spbrook
615e5fe0c52Spbrook /*
616e5fe0c52Spbrook * Now run through the relocation entries.
617e5fe0c52Spbrook * We've got to be careful here as C++ produces relocatable zero
618e5fe0c52Spbrook * entries in the constructor and destructor tables which are then
619e5fe0c52Spbrook * tested for being not zero (which will always occur unless we're
620e5fe0c52Spbrook * based from address zero). This causes an endless loop as __start
621e5fe0c52Spbrook * is at zero. The solution used is to not relocate zero addresses.
622e5fe0c52Spbrook * This has the negative side effect of not allowing a global data
623e5fe0c52Spbrook * reference to be statically initialised to _stext (I've moved
624e5fe0c52Spbrook * __start to address 4 so that is okay).
625e5fe0c52Spbrook */
626e5fe0c52Spbrook if (rev > OLD_FLAT_VERSION) {
627c3109ba1SMike Frysinger abi_ulong persistent = 0;
628e5fe0c52Spbrook for (i = 0; i < relocs; i++) {
629992f48a0Sblueswir1 abi_ulong addr, relval;
630e5fe0c52Spbrook
631e5fe0c52Spbrook /* Get the address of the pointer to be
632e5fe0c52Spbrook relocated (of course, the address has to be
633e5fe0c52Spbrook relocated first). */
6342f619698Sbellard if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
6352f619698Sbellard return -EFAULT;
636c3109ba1SMike Frysinger relval = ntohl(relval);
637c3109ba1SMike Frysinger if (flat_set_persistent(relval, &persistent))
638c3109ba1SMike Frysinger continue;
639e5fe0c52Spbrook addr = flat_get_relocate_addr(relval);
640e5fe0c52Spbrook rp = calc_reloc(addr, libinfo, id, 1);
641e5fe0c52Spbrook if (rp == RELOC_FAILED)
642e5fe0c52Spbrook return -ENOEXEC;
643e5fe0c52Spbrook
644e5fe0c52Spbrook /* Get the pointer's value. */
6452f619698Sbellard if (get_user_ual(addr, rp))
6462f619698Sbellard return -EFAULT;
6479721cf2cSCorey J. Boyle addr = flat_get_addr_from_rp(addr, relval, flags, &persistent);
648e5fe0c52Spbrook if (addr != 0) {
649e5fe0c52Spbrook /*
650e5fe0c52Spbrook * Do the relocation. PIC relocs in the data section are
651e5fe0c52Spbrook * already in target order
652e5fe0c52Spbrook */
653e5fe0c52Spbrook if ((flags & FLAT_FLAG_GOTPIC) == 0)
654c3109ba1SMike Frysinger addr = ntohl(addr);
655e5fe0c52Spbrook addr = calc_reloc(addr, libinfo, id, 0);
656e5fe0c52Spbrook if (addr == RELOC_FAILED)
657e5fe0c52Spbrook return -ENOEXEC;
658e5fe0c52Spbrook
659e5fe0c52Spbrook /* Write back the relocated pointer. */
660c3109ba1SMike Frysinger if (flat_put_addr_at_rp(rp, addr, relval))
6612f619698Sbellard return -EFAULT;
662e5fe0c52Spbrook }
663e5fe0c52Spbrook }
664e5fe0c52Spbrook } else {
665e5fe0c52Spbrook for (i = 0; i < relocs; i++) {
666992f48a0Sblueswir1 abi_ulong relval;
6672f619698Sbellard if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
6682f619698Sbellard return -EFAULT;
669e5fe0c52Spbrook old_reloc(&libinfo[0], relval);
670e5fe0c52Spbrook }
671e5fe0c52Spbrook }
672e5fe0c52Spbrook
673e5fe0c52Spbrook /* zero the BSS. */
6743e8f1628SRichard Henderson memset(g2h_untagged(datapos + data_len), 0, bss_len);
675e5fe0c52Spbrook
676e5fe0c52Spbrook return 0;
677e5fe0c52Spbrook }
678e5fe0c52Spbrook
679e5fe0c52Spbrook
680e5fe0c52Spbrook /****************************************************************************/
681e5fe0c52Spbrook #ifdef CONFIG_BINFMT_SHARED_FLAT
682e5fe0c52Spbrook
683e5fe0c52Spbrook /*
684e5fe0c52Spbrook * Load a shared library into memory. The library gets its own data
685e5fe0c52Spbrook * segment (including bss) but not argv/argc/environ.
686e5fe0c52Spbrook */
687e5fe0c52Spbrook
load_flat_shared_library(int id,struct lib_info * libs)688e5fe0c52Spbrook static int load_flat_shared_library(int id, struct lib_info *libs)
689e5fe0c52Spbrook {
690e5fe0c52Spbrook struct linux_binprm bprm;
691e5fe0c52Spbrook int res;
692e5fe0c52Spbrook char buf[16];
693e5fe0c52Spbrook
694e5fe0c52Spbrook /* Create the file name */
695e5fe0c52Spbrook sprintf(buf, "/lib/lib%d.so", id);
696e5fe0c52Spbrook
697e5fe0c52Spbrook /* Open the file up */
698e5fe0c52Spbrook bprm.filename = buf;
699e5fe0c52Spbrook bprm.file = open_exec(bprm.filename);
700e5fe0c52Spbrook res = PTR_ERR(bprm.file);
701e5fe0c52Spbrook if (IS_ERR(bprm.file))
702e5fe0c52Spbrook return res;
703e5fe0c52Spbrook
704e5fe0c52Spbrook res = prepare_binprm(&bprm);
705e5fe0c52Spbrook
70671987b12SPhilippe Mathieu-Daudé if (!is_error(res)) {
707e5fe0c52Spbrook res = load_flat_file(&bprm, libs, id, NULL);
70871987b12SPhilippe Mathieu-Daudé }
709e5fe0c52Spbrook if (bprm.file) {
710e5fe0c52Spbrook allow_write_access(bprm.file);
711e5fe0c52Spbrook fput(bprm.file);
712e5fe0c52Spbrook bprm.file = NULL;
713e5fe0c52Spbrook }
714e5fe0c52Spbrook return(res);
715e5fe0c52Spbrook }
716e5fe0c52Spbrook
717e5fe0c52Spbrook #endif /* CONFIG_BINFMT_SHARED_FLAT */
718e5fe0c52Spbrook
load_flt_binary(struct linux_binprm * bprm,struct image_info * info)719f0116c54SWill Newton int load_flt_binary(struct linux_binprm *bprm, struct image_info *info)
720e5fe0c52Spbrook {
721e5fe0c52Spbrook struct lib_info libinfo[MAX_SHARED_LIBS];
72259baae9aSStefan Brüns abi_ulong p;
723992f48a0Sblueswir1 abi_ulong stack_len;
724992f48a0Sblueswir1 abi_ulong start_addr;
725992f48a0Sblueswir1 abi_ulong sp;
726e5fe0c52Spbrook int res;
727e5fe0c52Spbrook int i, j;
728e5fe0c52Spbrook
729e5fe0c52Spbrook memset(libinfo, 0, sizeof(libinfo));
730e5fe0c52Spbrook /*
731e5fe0c52Spbrook * We have to add the size of our arguments to our stack size
732e5fe0c52Spbrook * otherwise it's too easy for users to create stack overflows
733e5fe0c52Spbrook * by passing in a huge argument list. And yes, we have to be
734e5fe0c52Spbrook * pedantic and include space for the argv/envp array as it may have
735e5fe0c52Spbrook * a lot of entries.
736e5fe0c52Spbrook */
73782a39595SMike Frysinger stack_len = 0;
73882a39595SMike Frysinger for (i = 0; i < bprm->argc; ++i) {
73982a39595SMike Frysinger /* the argv strings */
74082a39595SMike Frysinger stack_len += strlen(bprm->argv[i]);
74182a39595SMike Frysinger }
74282a39595SMike Frysinger for (i = 0; i < bprm->envc; ++i) {
74382a39595SMike Frysinger /* the envp strings */
74482a39595SMike Frysinger stack_len += strlen(bprm->envp[i]);
74582a39595SMike Frysinger }
746e5fe0c52Spbrook stack_len += (bprm->argc + 1) * 4; /* the argv array */
747e5fe0c52Spbrook stack_len += (bprm->envc + 1) * 4; /* the envp array */
748e5fe0c52Spbrook
749e5fe0c52Spbrook
750e5fe0c52Spbrook res = load_flat_file(bprm, libinfo, 0, &stack_len);
75171987b12SPhilippe Mathieu-Daudé if (is_error(res)) {
752e5fe0c52Spbrook return res;
75371987b12SPhilippe Mathieu-Daudé }
754e5fe0c52Spbrook
755e5fe0c52Spbrook /* Update data segment pointers for all libraries */
756e5fe0c52Spbrook for (i=0; i<MAX_SHARED_LIBS; i++) {
757e5fe0c52Spbrook if (libinfo[i].loaded) {
758d5308ea6SLaurent Vivier abi_ulong seg;
759d5308ea6SLaurent Vivier seg = libinfo[i].start_data;
760e5fe0c52Spbrook for (j=0; j<MAX_SHARED_LIBS; j++) {
761d5308ea6SLaurent Vivier seg -= 4;
7622f619698Sbellard /* FIXME - handle put_user() failures */
7632f619698Sbellard if (put_user_ual(libinfo[j].loaded
764e5fe0c52Spbrook ? libinfo[j].start_data
7652f619698Sbellard : UNLOADED_LIB,
766d5308ea6SLaurent Vivier seg))
7672f619698Sbellard return -EFAULT;
768e5fe0c52Spbrook }
769e5fe0c52Spbrook }
770e5fe0c52Spbrook }
771e5fe0c52Spbrook
772e5fe0c52Spbrook p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4;
773e5fe0c52Spbrook DBG_FLT("p=%x\n", (int)p);
774e5fe0c52Spbrook
775e5fe0c52Spbrook /* Copy argv/envp. */
776e5fe0c52Spbrook p = copy_strings(p, bprm->envc, bprm->envp);
777388c4508Spbrook p = copy_strings(p, bprm->argc, bprm->argv);
778e5fe0c52Spbrook /* Align stack. */
779992f48a0Sblueswir1 sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1);
780b35d7448Spbrook /* Enforce final stack alignment of 16 bytes. This is sufficient
781b35d7448Spbrook for all current targets, and excess alignment is harmless. */
782b35d7448Spbrook stack_len = bprm->envc + bprm->argc + 2;
783669dcb60SMichael Tokarev stack_len += flat_argvp_envp_on_stack() ? 2 : 0; /* argv, argp */
7845c76d652SMax Filippov stack_len += 1; /* argc */
785992f48a0Sblueswir1 stack_len *= sizeof(abi_ulong);
7865c76d652SMax Filippov sp -= (sp - stack_len) & 15;
787c3109ba1SMike Frysinger sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p,
788c3109ba1SMike Frysinger flat_argvp_envp_on_stack());
789e5fe0c52Spbrook
790e5fe0c52Spbrook /* Fake some return addresses to ensure the call chain will
791e5fe0c52Spbrook * initialise library in order for us. We are required to call
792e5fe0c52Spbrook * lib 1 first, then 2, ... and finally the main program (id 0).
793e5fe0c52Spbrook */
794e5fe0c52Spbrook start_addr = libinfo[0].entry;
795e5fe0c52Spbrook
796e5fe0c52Spbrook #ifdef CONFIG_BINFMT_SHARED_FLAT
797e5fe0c52Spbrook #error here
798e5fe0c52Spbrook for (i = MAX_SHARED_LIBS-1; i>0; i--) {
799e5fe0c52Spbrook if (libinfo[i].loaded) {
8006f9ff551Szhaolichang /* Push previous first to call address */
8012f619698Sbellard --sp;
8022f619698Sbellard if (put_user_ual(start_addr, sp))
8032f619698Sbellard return -EFAULT;
804e5fe0c52Spbrook start_addr = libinfo[i].entry;
805e5fe0c52Spbrook }
806e5fe0c52Spbrook }
807e5fe0c52Spbrook #endif
808e5fe0c52Spbrook
809e5fe0c52Spbrook /* Stash our initial stack pointer into the mm structure */
810e5fe0c52Spbrook info->start_code = libinfo[0].start_code;
811734a659aSPeter Maydell info->end_code = libinfo[0].start_code + libinfo[0].text_len;
812e5fe0c52Spbrook info->start_data = libinfo[0].start_data;
813e5fe0c52Spbrook info->end_data = libinfo[0].end_data;
8140662a626SRichard Henderson info->brk = libinfo[0].start_brk;
815e5fe0c52Spbrook info->start_stack = sp;
81697374d38SPaul Brook info->stack_limit = libinfo[0].start_brk;
817e5fe0c52Spbrook info->entry = start_addr;
818978efd6aSpbrook info->code_offset = info->start_code;
819978efd6aSpbrook info->data_offset = info->start_data - libinfo[0].text_len;
820978efd6aSpbrook
821e5fe0c52Spbrook DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
822e5fe0c52Spbrook (int)info->entry, (int)info->start_stack);
823e5fe0c52Spbrook
824e5fe0c52Spbrook return 0;
825e5fe0c52Spbrook }
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