WebSVN – HelenOS – Diff – /branches/dynload/uspace/srv/loader/elf_load.c


/*
 * Copyright (c) 2006 Sergey Bondari
 * Copyright (c) 2006 Jakub Jermar
 * Copyright (c) 2008 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - 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.
 */
 
/** @addtogroup generic
 * @{
 */
 
/**
 * @file
 * @brief   Kernel ELF loader.
 */
 
#include <stdio.h>
#include <sys/types.h>
#include <align.h>
#include <assert.h>
#include <as.h>
#include <unistd.h>
#include <fcntl.h>
 
#include "elf.h"
#include "pcb.h"
#include "elf_load.h"
 
#define RTLD_BIAS 0x80000
//#define RTLD_BIAS 0
 
static char *error_codes[] = {
    "no error",
    "invalid image",
    "address space error",
    "incompatible image",
    "unsupported image type",
    "irrecoverable error"
};
 
static unsigned int elf_load(elf_ld_t *elf);
static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry);
static int section_header(elf_ld_t *elf, elf_section_header_t *entry);
static int load_segment(elf_ld_t *elf, elf_segment_header_t *entry);
 
int elf_load_file(char *file_name, elf_info_t *info)
{
    elf_ld_t elf;
 
    int fd;
    int rc;
 
    printf("open and read '%s'...\n", file_name);
 
    fd = open(file_name, 0);
    if (fd < 0) {
        printf("failed opening file\n");
        return -1;
    }
 
    elf.fd = fd;
    elf.info = info;
 
    rc = elf_load(&elf);
    printf("elf_load() -> %d\n", rc);
 
    close(fd);
 
    return rc;
}
 
void elf_run(elf_info_t *info)
{
    (*info->entry)();
 
    /* not reached */
}
 
int elf_create_pcb(elf_info_t *info)
{
    pcb_t *pcb;
    void *a;
 
    pcb = (pcb_t *)PCB_ADDRESS;
 
    a = as_area_create(pcb, sizeof(pcb_t), AS_AREA_READ | AS_AREA_WRITE);
    if (a == (void *)(-1)) {
        printf("elf_create_pcb: memory mapping failed\n");
        return EE_MEMORY;
    }
 
    pcb->entry = info->entry;
    pcb->dynamic = info->dynamic;
 
    return 0;
}
 
 
/** ELF loader
 *
 * @param header Pointer to ELF header in memory
 * @return EE_OK on success
 */
static unsigned int elf_load(elf_ld_t *elf)
{
    elf_header_t header_buf;
    elf_header_t *header = &header_buf;
    int i, rc;
 
    rc = read(elf->fd, header, sizeof(elf_header_t));
    if (rc < 0) {
        printf("read error\n");
        return EE_INVALID;
    }
 
    elf->header = header;
 
    printf("ELF-load:");
    /* Identify ELF */
    if (header->e_ident[EI_MAG0] != ELFMAG0 ||
        header->e_ident[EI_MAG1] != ELFMAG1 ||
        header->e_ident[EI_MAG2] != ELFMAG2 ||
        header->e_ident[EI_MAG3] != ELFMAG3) {
        printf("invalid header\n");
        return EE_INVALID;
    }
   
    /* Identify ELF compatibility */
    if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING ||
        header->e_machine != ELF_MACHINE ||
        header->e_ident[EI_VERSION] != EV_CURRENT ||
        header->e_version != EV_CURRENT ||
        header->e_ident[EI_CLASS] != ELF_CLASS) {
        printf("incompatible data/version/class\n");
        return EE_INCOMPATIBLE;
    }
 
    if (header->e_phentsize != sizeof(elf_segment_header_t))
        return EE_INCOMPATIBLE;
 
    if (header->e_shentsize != sizeof(elf_section_header_t))
        return EE_INCOMPATIBLE;
 
    /* Check if the object type is supported. */
    if (header->e_type != ET_EXEC && header->e_type != ET_DYN) {
        printf("Object type %d is not supported\n", header->e_type);
        return EE_UNSUPPORTED;
    }
 
    /* The run-time dynamic linker is loaded with a bias */
    printf("Object type: %d\n", header->e_type);
    if (header->e_type == ET_DYN)
        elf->bias = RTLD_BIAS;
    else
        elf->bias = 0;
 
    printf("Bias set to 0x%d\n", elf->bias);
 
    printf("parse segments\n");
 
    /* Walk through all segment headers and process them. */
    for (i = 0; i < header->e_phnum; i++) {
        elf_segment_header_t segment_hdr;
 
        /* Seek to start of segment header */
        lseek(elf->fd, header->e_phoff
                + i * sizeof(elf_segment_header_t), SEEK_SET);
 
        rc = read(elf->fd, &segment_hdr, sizeof(elf_segment_header_t));
        if (rc < 0) { printf("read error\n"); return EE_INVALID; }
 
        rc = segment_header(elf, &segment_hdr);
        if (rc != EE_OK)
            return rc;
    }
 
    printf("parse sections\n");
 
    /* Inspect all section headers and proccess them. */
    for (i = 0; i < header->e_shnum; i++) {
        elf_section_header_t section_hdr;
 
        /* Seek to start of section header */
        lseek(elf->fd, header->e_shoff
            + i * sizeof(elf_section_header_t), SEEK_SET);
 
        rc = read(elf->fd, &section_hdr, sizeof(elf_section_header_t));
        if (rc < 0) { printf("read error\n"); return EE_INVALID; }
 
        rc = section_header(elf, &section_hdr);
        if (rc != EE_OK)
            return rc;
    }
 
    elf->info->entry =
        (entry_point_t)((uint8_t *)header->e_entry + elf->bias);
 
    printf("done\n");
 
    return EE_OK;
}
 
/** Print error message according to error code.
 *
 * @param rc Return code returned by elf_load().
 *
 * @return NULL terminated description of error.
 */
char *elf_error(unsigned int rc)
{
    assert(rc < sizeof(error_codes) / sizeof(char *));
 
    return error_codes[rc];
}
 
/** Process segment header.
 *
 * @param entry Segment header.
 * @param elf ELF header.
 *
 * @return EE_OK on success, error code otherwise.
 */
static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry)
{
    switch (entry->p_type) {
    case PT_NULL:
    case PT_PHDR:
        break;
    case PT_LOAD:
        return load_segment(elf, entry);
        break;
    case PT_DYNAMIC:
    case PT_INTERP:
    case PT_SHLIB:
    case PT_NOTE:
    case PT_LOPROC:
    case PT_HIPROC:
    default:
        printf("segment p_type %d unknown\n", entry->p_type);
        return EE_UNSUPPORTED;
        break;
    }
    return EE_OK;
}
 
/** Load segment described by program header entry.
 *
 * @param entry Program header entry describing segment to be loaded.
 * @param elf ELF header.
 *
 * @return EE_OK on success, error code otherwise.
 */
int load_segment(elf_ld_t *elf, elf_segment_header_t *entry)
{
    void *a;
    int flags = 0;
    uintptr_t bias;
    int rc;
 
    printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr,
        entry->p_memsz);
   
    bias = elf->bias;
 
    if (entry->p_align > 1) {
        if ((entry->p_offset % entry->p_align) !=
            (entry->p_vaddr % entry->p_align)) {
            printf("align check 1 failed offset%%align=%d, vaddr%%align=%d\n",
            entry->p_offset % entry->p_align,
            entry->p_vaddr % entry->p_align
            );
            return EE_INVALID;
        }
    }
 
/*  if (entry->p_flags & PF_X)
        flags |= AS_AREA_EXEC;
    if (entry->p_flags & PF_W)
        flags |= AS_AREA_WRITE;
    if (entry->p_flags & PF_R)
        flags |= AS_AREA_READ;
    flags |= AS_AREA_CACHEABLE;
*/
    /* FIXME: Kernel won't normally allow this, unless you "patch" it */
//  flags = AS_AREA_READ | AS_AREA_WRITE | AS_AREA_EXEC | AS_AREA_CACHEABLE;
    flags = AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE;
 
    /*
     * Check if the virtual address starts on page boundary.
     */
    if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) {
        printf("align check 2 failed - not page-aligned\n");
        printf("vaddr = 0x%x, should be 0x%x\n",
            entry->p_vaddr, ALIGN_UP(entry->p_vaddr, PAGE_SIZE));
        return EE_UNSUPPORTED;
    }
   
    printf("map to p_vaddr=0x%x-0x%x...\n", entry->p_vaddr + bias,
    entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE));
 
    a = as_area_create((uint8_t *)entry->p_vaddr + bias,
        entry->p_memsz, flags);
    if (a == (void *)(-1)) {
        printf("memory mapping failed\n");
        return EE_MEMORY;
    }
 
    printf("as_area_create(0x%x, 0x%x, %d) -> 0x%x\n",
        entry->p_vaddr+bias, entry->p_memsz, flags, (unsigned)a);
 
    /*
     * Load segment data
     */
    printf("seek to %d\n", entry->p_offset);
    rc = lseek(elf->fd, entry->p_offset, SEEK_SET);
    if (rc < 0) { printf("seek error\n"); return EE_INVALID; }
 
    printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias);
/*  rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz);
    if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/
    unsigned left, now;
    uint8_t *dp;
 
    left = entry->p_filesz;
    dp = (uint8_t *)(entry->p_vaddr + bias);
 
    while (left > 0) {
        now = 4096;
        if (now > left) now=left;
        printf("read %d...", now);
        rc = read(elf->fd, dp, now);
        if (rc < 0) { printf("read error\n"); return EE_INVALID; }
        printf("->%d\n", rc);
        left -= now;
        dp += now;
    }
 
    return EE_OK;
}
 
/** Process section header.
 *
 * @param entry Segment header.
 * @param elf ELF header.
 *
 * @return EE_OK on success, error code otherwise.
 */
static int section_header(elf_ld_t *elf, elf_section_header_t *entry)
{
    switch (entry->sh_type) {
    case SHT_PROGBITS:
        if (entry->sh_flags & SHF_TLS) {
            /* .tdata */
        }
        break;
    case SHT_NOBITS:
        if (entry->sh_flags & SHF_TLS) {
            /* .tbss */
        }
        break;
    case SHT_DYNAMIC:
        elf->info->dynamic =
            (void *)((uint8_t *)entry->sh_addr + elf->bias);
        printf("dynamic section found at 0x%x\n",
            (uintptr_t)elf->info->dynamic);
        break;
    default:
        break;
    }
   
    return EE_OK;
}
 
/** @}
 */
 

Rev 2965	Rev 2971
1	/*	1	/*
2	* Copyright (c) 2006 Sergey Bondari	2	* Copyright (c) 2006 Sergey Bondari
3	* Copyright (c) 2006 Jakub Jermar	3	* Copyright (c) 2006 Jakub Jermar
4	* Copyright (c) 2008 Jiri Svoboda	4	* Copyright (c) 2008 Jiri Svoboda
5	* All rights reserved.	5	* All rights reserved.
6	*	6	*
7	* Redistribution and use in source and binary forms, with or without	7	* Redistribution and use in source and binary forms, with or without
8	* modification, are permitted provided that the following conditions	8	* modification, are permitted provided that the following conditions
9	* are met:	9	* are met:
10	*	10	*
11	* - Redistributions of source code must retain the above copyright	11	* - Redistributions of source code must retain the above copyright
12	* notice, this list of conditions and the following disclaimer.	12	* notice, this list of conditions and the following disclaimer.
13	* - Redistributions in binary form must reproduce the above copyright	13	* - Redistributions in binary form must reproduce the above copyright
14	* notice, this list of conditions and the following disclaimer in the	14	* notice, this list of conditions and the following disclaimer in the
15	* documentation and/or other materials provided with the distribution.	15	* documentation and/or other materials provided with the distribution.
16	* - The name of the author may not be used to endorse or promote products	16	* - The name of the author may not be used to endorse or promote products
17	* derived from this software without specific prior written permission.	17	* derived from this software without specific prior written permission.
18	*	18	*
19	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	19	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	20	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	21	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	22	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	23	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	24	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	25	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	26	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	27	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	28	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29	*/	29	*/
30		30
31	/** @addtogroup generic	31	/** @addtogroup generic
32	* @{	32	* @{
33	*/	33	*/
34		34
35	/**	35	/**
36	* @file	36	* @file
37	* @brief Kernel ELF loader.	37	* @brief Kernel ELF loader.
38	*/	38	*/
39		39
40	#include <stdio.h>	40	#include <stdio.h>
41	#include <sys/types.h>	41	#include <sys/types.h>
42	#include <align.h>	42	#include <align.h>
43	#include <assert.h>	43	#include <assert.h>
44	#include <as.h>	44	#include <as.h>
45	#include <unistd.h>	45	#include <unistd.h>
46	#include <fcntl.h>	46	#include <fcntl.h>
47		47
48	#include "elf.h"	48	#include "elf.h"
49	#include "pcb.h"	49	#include "pcb.h"
50	#include "elf_load.h"	50	#include "elf_load.h"
51		51
52	#define RTLD_BIAS 0x80000	52	#define RTLD_BIAS 0x80000
53	//#define RTLD_BIAS 0	53	//#define RTLD_BIAS 0
54		54
55	static char *error_codes[] = {	55	static char *error_codes[] = {
56	"no error",	56	"no error",
57	"invalid image",	57	"invalid image",
58	"address space error",	58	"address space error",
59	"incompatible image",	59	"incompatible image",
60	"unsupported image type",	60	"unsupported image type",
61	"irrecoverable error"	61	"irrecoverable error"
62	};	62	};
63		63
64	static unsigned int elf_load(elf_ld_t *elf);	64	static unsigned int elf_load(elf_ld_t *elf);
65	static int segment_header(elf_ld_t elf, elf_segment_header_t entry);	65	static int segment_header(elf_ld_t elf, elf_segment_header_t entry);
66	static int section_header(elf_ld_t elf, elf_section_header_t entry);	66	static int section_header(elf_ld_t elf, elf_section_header_t entry);
67	static int load_segment(elf_ld_t elf, elf_segment_header_t entry);	67	static int load_segment(elf_ld_t elf, elf_segment_header_t entry);
68		68
69	int elf_load_file(char file_name, elf_info_t info)	69	int elf_load_file(char file_name, elf_info_t info)
70	{	70	{
71	elf_ld_t elf;	71	elf_ld_t elf;
72		72
73	int fd;	73	int fd;
74	int rc;	74	int rc;
75		75
76	printf("open and read '%s'...\n", file_name);	76	printf("open and read '%s'...\n", file_name);
77		77
78	fd = open(file_name, 0);	78	fd = open(file_name, 0);
79	if (fd < 0) {	79	if (fd < 0) {
80	printf("failed opening file\n");	80	printf("failed opening file\n");
81	return -1;	81	return -1;
82	}	82	}
83		83
84	elf.fd = fd;	84	elf.fd = fd;
85	elf.info = info;	85	elf.info = info;
86		86
87	rc = elf_load(&elf);	87	rc = elf_load(&elf);
88	printf("elf_load() -> %d\n", rc);	88	printf("elf_load() -> %d\n", rc);
89		89
90	close(fd);	90	close(fd);
91		91
92	return rc;	92	return rc;
93	}	93	}
94		94
95	void elf_run(elf_info_t *info)	95	void elf_run(elf_info_t *info)
96	{	96	{
97	(*info->entry)();	97	(*info->entry)();
98		98
99	/* not reached */	99	/* not reached */
100	}	100	}
101		101
102	int elf_create_pcb(elf_info_t *info)	102	int elf_create_pcb(elf_info_t *info)
103	{	103	{
104	pcb_t *pcb;	104	pcb_t *pcb;
105	void *a;	105	void *a;
106		106
107	pcb = (pcb_t *)PCB_ADDRESS;	107	pcb = (pcb_t *)PCB_ADDRESS;
108		108
109	a = as_area_create(pcb, sizeof(pcb_t), AS_AREA_READ \| AS_AREA_WRITE);	109	a = as_area_create(pcb, sizeof(pcb_t), AS_AREA_READ \| AS_AREA_WRITE);
110	if (a == (void *)(-1)) {	110	if (a == (void *)(-1)) {
111	printf("elf_create_pcb: memory mapping failed\n");	111	printf("elf_create_pcb: memory mapping failed\n");
112	return EE_MEMORY;	112	return EE_MEMORY;
113	}	113	}
114		114
115	pcb->entry = info->entry;	115	pcb->entry = info->entry;
116	pcb->dynamic = info->dynamic;	116	pcb->dynamic = info->dynamic;
117		117
118	return 0;	118	return 0;
119	}	119	}
120		120
121		121
122	/** ELF loader	122	/** ELF loader
123	*	123	*
124	* @param header Pointer to ELF header in memory	124	* @param header Pointer to ELF header in memory
125	* @return EE_OK on success	125	* @return EE_OK on success
126	*/	126	*/
127	static unsigned int elf_load(elf_ld_t *elf)	127	static unsigned int elf_load(elf_ld_t *elf)
128	{	128	{
129	elf_header_t header_buf;	129	elf_header_t header_buf;
130	elf_header_t *header = &header_buf;	130	elf_header_t *header = &header_buf;
131	int i, rc;	131	int i, rc;
132		132
133	rc = read(elf->fd, header, sizeof(elf_header_t));	133	rc = read(elf->fd, header, sizeof(elf_header_t));
134	if (rc < 0) {	134	if (rc < 0) {
135	printf("read error\n");	135	printf("read error\n");
136	return EE_INVALID;	136	return EE_INVALID;
137	}	137	}
138		138
139	elf->header = header;	139	elf->header = header;
140		140
141	printf("ELF-load:");	141	printf("ELF-load:");
142	/* Identify ELF */	142	/* Identify ELF */
143	if (header->e_ident[EI_MAG0] != ELFMAG0 \|\|	143	if (header->e_ident[EI_MAG0] != ELFMAG0 \|\|
144	header->e_ident[EI_MAG1] != ELFMAG1 \|\|	144	header->e_ident[EI_MAG1] != ELFMAG1 \|\|
145	header->e_ident[EI_MAG2] != ELFMAG2 \|\|	145	header->e_ident[EI_MAG2] != ELFMAG2 \|\|
146	header->e_ident[EI_MAG3] != ELFMAG3) {	146	header->e_ident[EI_MAG3] != ELFMAG3) {
147	printf("invalid header\n");	147	printf("invalid header\n");
148	return EE_INVALID;	148	return EE_INVALID;
149	}	149	}
150		150
151	/* Identify ELF compatibility */	151	/* Identify ELF compatibility */
152	if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING \|\|	152	if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING \|\|
153	header->e_machine != ELF_MACHINE \|\|	153	header->e_machine != ELF_MACHINE \|\|
154	header->e_ident[EI_VERSION] != EV_CURRENT \|\|	154	header->e_ident[EI_VERSION] != EV_CURRENT \|\|
155	header->e_version != EV_CURRENT \|\|	155	header->e_version != EV_CURRENT \|\|
156	header->e_ident[EI_CLASS] != ELF_CLASS) {	156	header->e_ident[EI_CLASS] != ELF_CLASS) {
157	printf("incompatible data/version/class\n");	157	printf("incompatible data/version/class\n");
158	return EE_INCOMPATIBLE;	158	return EE_INCOMPATIBLE;
159	}	159	}
160		160
161	if (header->e_phentsize != sizeof(elf_segment_header_t))	161	if (header->e_phentsize != sizeof(elf_segment_header_t))
162	return EE_INCOMPATIBLE;	162	return EE_INCOMPATIBLE;
163		163
164	if (header->e_shentsize != sizeof(elf_section_header_t))	164	if (header->e_shentsize != sizeof(elf_section_header_t))
165	return EE_INCOMPATIBLE;	165	return EE_INCOMPATIBLE;
166		166
167	/* Check if the object type is supported. */	167	/* Check if the object type is supported. */
168	if (header->e_type != ET_EXEC && header->e_type != ET_DYN) {	168	if (header->e_type != ET_EXEC && header->e_type != ET_DYN) {
169	printf("Object type %d is not supported\n", header->e_type);	169	printf("Object type %d is not supported\n", header->e_type);
170	return EE_UNSUPPORTED;	170	return EE_UNSUPPORTED;
171	}	171	}
172		172
173	/* The run-time dynamic linker is loaded with a bias */	173	/* The run-time dynamic linker is loaded with a bias */
-		174	printf("Object type: %d\n", header->e_type);
174	if (header->e_type == ET_DYN)	175	if (header->e_type == ET_DYN)
175	elf->bias = RTLD_BIAS;	176	elf->bias = RTLD_BIAS;
176	else	177	else
177	elf->bias = 0;	178	elf->bias = 0;
178		179
-		180	printf("Bias set to 0x%d\n", elf->bias);
-		181
179	printf("parse segments\n");	182	printf("parse segments\n");
180		183
181	/* Walk through all segment headers and process them. */	184	/* Walk through all segment headers and process them. */
182	for (i = 0; i < header->e_phnum; i++) {	185	for (i = 0; i < header->e_phnum; i++) {
183	elf_segment_header_t segment_hdr;	186	elf_segment_header_t segment_hdr;
184		187
185	/* Seek to start of segment header */	188	/* Seek to start of segment header */
186	lseek(elf->fd, header->e_phoff	189	lseek(elf->fd, header->e_phoff
187	+ i * sizeof(elf_segment_header_t), SEEK_SET);	190	+ i * sizeof(elf_segment_header_t), SEEK_SET);
188		191
189	rc = read(elf->fd, &segment_hdr, sizeof(elf_segment_header_t));	192	rc = read(elf->fd, &segment_hdr, sizeof(elf_segment_header_t));
190	if (rc < 0) { printf("read error\n"); return EE_INVALID; }	193	if (rc < 0) { printf("read error\n"); return EE_INVALID; }
191		194
192	rc = segment_header(elf, &segment_hdr);	195	rc = segment_header(elf, &segment_hdr);
193	if (rc != EE_OK)	196	if (rc != EE_OK)
194	return rc;	197	return rc;
195	}	198	}
196		199
197	printf("parse sections\n");	200	printf("parse sections\n");
198		201
199	/* Inspect all section headers and proccess them. */	202	/* Inspect all section headers and proccess them. */
200	for (i = 0; i < header->e_shnum; i++) {	203	for (i = 0; i < header->e_shnum; i++) {
201	elf_section_header_t section_hdr;	204	elf_section_header_t section_hdr;
202		205
203	/* Seek to start of section header */	206	/* Seek to start of section header */
204	lseek(elf->fd, header->e_shoff	207	lseek(elf->fd, header->e_shoff
205	+ i * sizeof(elf_section_header_t), SEEK_SET);	208	+ i * sizeof(elf_section_header_t), SEEK_SET);
206		209
207	rc = read(elf->fd, &section_hdr, sizeof(elf_section_header_t));	210	rc = read(elf->fd, &section_hdr, sizeof(elf_section_header_t));
208	if (rc < 0) { printf("read error\n"); return EE_INVALID; }	211	if (rc < 0) { printf("read error\n"); return EE_INVALID; }
209		212
210	rc = section_header(elf, &section_hdr);	213	rc = section_header(elf, &section_hdr);
211	if (rc != EE_OK)	214	if (rc != EE_OK)
212	return rc;	215	return rc;
213	}	216	}
214		217
215	elf->info->entry =	218	elf->info->entry =
216	(entry_point_t)((uint8_t *)header->e_entry + elf->bias);	219	(entry_point_t)((uint8_t *)header->e_entry + elf->bias);
217		220
218	printf("done\n");	221	printf("done\n");
219		222
220	return EE_OK;	223	return EE_OK;
221	}	224	}
222		225
223	/** Print error message according to error code.	226	/** Print error message according to error code.
224	*	227	*
225	* @param rc Return code returned by elf_load().	228	* @param rc Return code returned by elf_load().
226	*	229	*
227	* @return NULL terminated description of error.	230	* @return NULL terminated description of error.
228	*/	231	*/
229	char *elf_error(unsigned int rc)	232	char *elf_error(unsigned int rc)
230	{	233	{
231	assert(rc < sizeof(error_codes) / sizeof(char *));	234	assert(rc < sizeof(error_codes) / sizeof(char *));
232		235
233	return error_codes[rc];	236	return error_codes[rc];
234	}	237	}
235		238
236	/** Process segment header.	239	/** Process segment header.
237	*	240	*
238	* @param entry Segment header.	241	* @param entry Segment header.
239	* @param elf ELF header.	242	* @param elf ELF header.
240	*	243	*
241	* @return EE_OK on success, error code otherwise.	244	* @return EE_OK on success, error code otherwise.
242	*/	245	*/
243	static int segment_header(elf_ld_t elf, elf_segment_header_t entry)	246	static int segment_header(elf_ld_t elf, elf_segment_header_t entry)
244	{	247	{
245	switch (entry->p_type) {	248	switch (entry->p_type) {
246	case PT_NULL:	249	case PT_NULL:
247	case PT_PHDR:	250	case PT_PHDR:
248	break;	251	break;
249	case PT_LOAD:	252	case PT_LOAD:
250	return load_segment(elf, entry);	253	return load_segment(elf, entry);
251	break;	254	break;
252	case PT_DYNAMIC:	255	case PT_DYNAMIC:
253	case PT_INTERP:	256	case PT_INTERP:
254	case PT_SHLIB:	257	case PT_SHLIB:
255	case PT_NOTE:	258	case PT_NOTE:
256	case PT_LOPROC:	259	case PT_LOPROC:
257	case PT_HIPROC:	260	case PT_HIPROC:
258	default:	261	default:
259	printf("segment p_type %d unknown\n", entry->p_type);	262	printf("segment p_type %d unknown\n", entry->p_type);
260	return EE_UNSUPPORTED;	263	return EE_UNSUPPORTED;
261	break;	264	break;
262	}	265	}
263	return EE_OK;	266	return EE_OK;
264	}	267	}
265		268
266	/** Load segment described by program header entry.	269	/** Load segment described by program header entry.
267	*	270	*
268	* @param entry Program header entry describing segment to be loaded.	271	* @param entry Program header entry describing segment to be loaded.
269	* @param elf ELF header.	272	* @param elf ELF header.
270	*	273	*
271	* @return EE_OK on success, error code otherwise.	274	* @return EE_OK on success, error code otherwise.
272	*/	275	*/
273	int load_segment(elf_ld_t elf, elf_segment_header_t entry)	276	int load_segment(elf_ld_t elf, elf_segment_header_t entry)
274	{	277	{
275	void *a;	278	void *a;
276	int flags = 0;	279	int flags = 0;
277	uintptr_t bias;	280	uintptr_t bias;
278	int rc;	281	int rc;
279		282
280	printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr,	283	printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr,
281	entry->p_memsz);	284	entry->p_memsz);
282		285
283	bias = elf->bias;	286	bias = elf->bias;
284		287
285	if (entry->p_align > 1) {	288	if (entry->p_align > 1) {
286	if ((entry->p_offset % entry->p_align) !=	289	if ((entry->p_offset % entry->p_align) !=
287	(entry->p_vaddr % entry->p_align)) {	290	(entry->p_vaddr % entry->p_align)) {
288	printf("align check 1 failed offset%%align=%d, vaddr%%align=%d\n",	291	printf("align check 1 failed offset%%align=%d, vaddr%%align=%d\n",
289	entry->p_offset % entry->p_align,	292	entry->p_offset % entry->p_align,
290	entry->p_vaddr % entry->p_align	293	entry->p_vaddr % entry->p_align
291	);	294	);
292	return EE_INVALID;	295	return EE_INVALID;
293	}	296	}
294	}	297	}
295		298
296	/* if (entry->p_flags & PF_X)	299	/* if (entry->p_flags & PF_X)
297	flags \|= AS_AREA_EXEC;	300	flags \|= AS_AREA_EXEC;
298	if (entry->p_flags & PF_W)	301	if (entry->p_flags & PF_W)
299	flags \|= AS_AREA_WRITE;	302	flags \|= AS_AREA_WRITE;
300	if (entry->p_flags & PF_R)	303	if (entry->p_flags & PF_R)
301	flags \|= AS_AREA_READ;	304	flags \|= AS_AREA_READ;
302	flags \|= AS_AREA_CACHEABLE;	305	flags \|= AS_AREA_CACHEABLE;
303	*/	306	*/
304	/* FIXME: Kernel won't normally allow this, unless you "patch" it */	307	/* FIXME: Kernel won't normally allow this, unless you "patch" it */
305	// flags = AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_EXEC \| AS_AREA_CACHEABLE;	308	// flags = AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_EXEC \| AS_AREA_CACHEABLE;
306	flags = AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE;	309	flags = AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE;
307		310
308	/*	311	/*
309	* Check if the virtual address starts on page boundary.	312	* Check if the virtual address starts on page boundary.
310	*/	313	*/
311	if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) {	314	if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) {
312	printf("align check 2 failed - not page-aligned\n");	315	printf("align check 2 failed - not page-aligned\n");
313	printf("vaddr = 0x%x, should be 0x%x\n",	316	printf("vaddr = 0x%x, should be 0x%x\n",
314	entry->p_vaddr, ALIGN_UP(entry->p_vaddr, PAGE_SIZE));	317	entry->p_vaddr, ALIGN_UP(entry->p_vaddr, PAGE_SIZE));
315	return EE_UNSUPPORTED;	318	return EE_UNSUPPORTED;
316	}	319	}
317		320
318	printf("map to p_vaddr=0x%x-0x%x...\n", entry->p_vaddr + bias,	321	printf("map to p_vaddr=0x%x-0x%x...\n", entry->p_vaddr + bias,
319	entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE));	322	entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE));
320		323
321	a = as_area_create((uint8_t *)entry->p_vaddr + bias,	324	a = as_area_create((uint8_t *)entry->p_vaddr + bias,
322	entry->p_memsz, flags);	325	entry->p_memsz, flags);
323	if (a == (void *)(-1)) {	326	if (a == (void *)(-1)) {
324	printf("memory mapping failed\n");	327	printf("memory mapping failed\n");
325	return EE_MEMORY;	328	return EE_MEMORY;
326	}	329	}
327		330
328	printf("as_area_create(0x%x, 0x%x, %d) -> 0x%x\n",	331	printf("as_area_create(0x%x, 0x%x, %d) -> 0x%x\n",
329	entry->p_vaddr+bias, entry->p_memsz, flags, (unsigned)a);	332	entry->p_vaddr+bias, entry->p_memsz, flags, (unsigned)a);
330		333
331	/*	334	/*
332	* Load segment data	335	* Load segment data
333	*/	336	*/
334	printf("seek to %d\n", entry->p_offset);	337	printf("seek to %d\n", entry->p_offset);
335	rc = lseek(elf->fd, entry->p_offset, SEEK_SET);	338	rc = lseek(elf->fd, entry->p_offset, SEEK_SET);
336	if (rc < 0) { printf("seek error\n"); return EE_INVALID; }	339	if (rc < 0) { printf("seek error\n"); return EE_INVALID; }
337		340
338	printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias);	341	printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias);
339	/* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz);	342	/* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz);
340	if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/	343	if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/
341	unsigned left, now;	344	unsigned left, now;
342	uint8_t *dp;	345	uint8_t *dp;
343		346
344	left = entry->p_filesz;	347	left = entry->p_filesz;
345	dp = (uint8_t *)(entry->p_vaddr + bias);	348	dp = (uint8_t *)(entry->p_vaddr + bias);
346		349
347	while (left > 0) {	350	while (left > 0) {
348	now = 4096;	351	now = 4096;
349	if (now > left) now=left;	352	if (now > left) now=left;
350	printf("read %d...", now);	353	printf("read %d...", now);
351	rc = read(elf->fd, dp, now);	354	rc = read(elf->fd, dp, now);
352	if (rc < 0) { printf("read error\n"); return EE_INVALID; }	355	if (rc < 0) { printf("read error\n"); return EE_INVALID; }
353	printf("->%d\n", rc);	356	printf("->%d\n", rc);
354	left -= now;	357	left -= now;
355	dp += now;	358	dp += now;
356	}	359	}
357		360
358	return EE_OK;	361	return EE_OK;
359	}	362	}
360		363
361	/** Process section header.	364	/** Process section header.
362	*	365	*
363	* @param entry Segment header.	366	* @param entry Segment header.
364	* @param elf ELF header.	367	* @param elf ELF header.
365	*	368	*
366	* @return EE_OK on success, error code otherwise.	369	* @return EE_OK on success, error code otherwise.
367	*/	370	*/
368	static int section_header(elf_ld_t elf, elf_section_header_t entry)	371	static int section_header(elf_ld_t elf, elf_section_header_t entry)
369	{	372	{
370	switch (entry->sh_type) {	373	switch (entry->sh_type) {
371	case SHT_PROGBITS:	374	case SHT_PROGBITS:
372	if (entry->sh_flags & SHF_TLS) {	375	if (entry->sh_flags & SHF_TLS) {
373	/* .tdata */	376	/* .tdata */
374	}	377	}
375	break;	378	break;
376	case SHT_NOBITS:	379	case SHT_NOBITS:
377	if (entry->sh_flags & SHF_TLS) {	380	if (entry->sh_flags & SHF_TLS) {
378	/* .tbss */	381	/* .tbss */
379	}	382	}
380	break;	383	break;
381	case SHT_DYNAMIC:	384	case SHT_DYNAMIC:
382	elf->info->dynamic =	385	elf->info->dynamic =
383	(void )((uint8_t )entry->sh_addr + elf->bias);	386	(void )((uint8_t )entry->sh_addr + elf->bias);
384	printf("dynamic section found at 0x%x\n",	387	printf("dynamic section found at 0x%x\n",
385	(uintptr_t)elf->info->dynamic);	388	(uintptr_t)elf->info->dynamic);
386	break;	389	break;
387	default:	390	default:
388	break;	391	break;
389	}	392	}
390		393
391	return EE_OK;	394	return EE_OK;
392	}	395	}
393		396
394	/** @}	397	/** @}
395	*/	398	*/
396		399

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(root)/branches/dynload/uspace/srv/loader/elf_load.c @ 3555 – Rev 2965 → 2971