WebSVN – HelenOS – Diff – /branches/dynload/uspace/app/iloader/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"
 
 
 
 
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, size_t so_bias);
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, size_t so_bias, 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, so_bias);
    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, size_t so_bias)
{
    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;
    }
 
    /* Shared objects can be loaded with a bias */
    printf("Object type: %d\n", header->e_type);
    if (header->e_type == ET_DYN)
        elf->bias = so_bias;
    else
        elf->bias = 0;
 
    printf("Bias set to 0x%x\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 2971	Rev 2972
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	-
53	//#define RTLD_BIAS 0	-
54		-
55	static char *error_codes[] = {	52	static char *error_codes[] = {
56	"no error",	53	"no error",
57	"invalid image",	54	"invalid image",
58	"address space error",	55	"address space error",
59	"incompatible image",	56	"incompatible image",
60	"unsupported image type",	57	"unsupported image type",
61	"irrecoverable error"	58	"irrecoverable error"
62	};	59	};
63		60
64	static unsigned int elf_load(elf_ld_t *elf);	61	static unsigned int elf_load(elf_ld_t *elf, size_t so_bias);
65	static int segment_header(elf_ld_t elf, elf_segment_header_t entry);	62	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);	63	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);	64	static int load_segment(elf_ld_t elf, elf_segment_header_t entry);
68		65
69	int elf_load_file(char file_name, elf_info_t info)	66	int elf_load_file(char file_name, size_t so_bias, elf_info_t info)
70	{	67	{
71	elf_ld_t elf;	68	elf_ld_t elf;
72		69
73	int fd;	70	int fd;
74	int rc;	71	int rc;
75		72
76	printf("open and read '%s'...\n", file_name);	73	printf("open and read '%s'...\n", file_name);
77		74
78	fd = open(file_name, 0);	75	fd = open(file_name, 0);
79	if (fd < 0) {	76	if (fd < 0) {
80	printf("failed opening file\n");	77	printf("failed opening file\n");
81	return -1;	78	return -1;
82	}	79	}
83		80
84	elf.fd = fd;	81	elf.fd = fd;
85	elf.info = info;	82	elf.info = info;
86		83
87	rc = elf_load(&elf);	84	rc = elf_load(&elf, so_bias);
88	printf("elf_load() -> %d\n", rc);	85	printf("elf_load() -> %d\n", rc);
89		86
90	close(fd);	87	close(fd);
91		88
92	return rc;	89	return rc;
93	}	90	}
94		91
95	void elf_run(elf_info_t *info)	92	void elf_run(elf_info_t *info)
96	{	93	{
97	(*info->entry)();	94	(*info->entry)();
98		95
99	/* not reached */	96	/* not reached */
100	}	97	}
101		98
102	int elf_create_pcb(elf_info_t *info)	99	int elf_create_pcb(elf_info_t *info)
103	{	100	{
104	pcb_t *pcb;	101	pcb_t *pcb;
105	void *a;	102	void *a;
106		103
107	pcb = (pcb_t *)PCB_ADDRESS;	104	pcb = (pcb_t *)PCB_ADDRESS;
108		105
109	a = as_area_create(pcb, sizeof(pcb_t), AS_AREA_READ \| AS_AREA_WRITE);	106	a = as_area_create(pcb, sizeof(pcb_t), AS_AREA_READ \| AS_AREA_WRITE);
110	if (a == (void *)(-1)) {	107	if (a == (void *)(-1)) {
111	printf("elf_create_pcb: memory mapping failed\n");	108	printf("elf_create_pcb: memory mapping failed\n");
112	return EE_MEMORY;	109	return EE_MEMORY;
113	}	110	}
114		111
115	pcb->entry = info->entry;	112	pcb->entry = info->entry;
116	pcb->dynamic = info->dynamic;	113	pcb->dynamic = info->dynamic;
117		114
118	return 0;	115	return 0;
119	}	116	}
120		117
121		118
122	/** ELF loader	119	/** ELF loader
123	*	120	*
124	* @param header Pointer to ELF header in memory	121	* @param header Pointer to ELF header in memory
125	* @return EE_OK on success	122	* @return EE_OK on success
126	*/	123	*/
127	static unsigned int elf_load(elf_ld_t *elf)	124	static unsigned int elf_load(elf_ld_t *elf, size_t so_bias)
128	{	125	{
129	elf_header_t header_buf;	126	elf_header_t header_buf;
130	elf_header_t *header = &header_buf;	127	elf_header_t *header = &header_buf;
131	int i, rc;	128	int i, rc;
132		129
133	rc = read(elf->fd, header, sizeof(elf_header_t));	130	rc = read(elf->fd, header, sizeof(elf_header_t));
134	if (rc < 0) {	131	if (rc < 0) {
135	printf("read error\n");	132	printf("read error\n");
136	return EE_INVALID;	133	return EE_INVALID;
137	}	134	}
138		135
139	elf->header = header;	136	elf->header = header;
140		137
141	printf("ELF-load:");	138	printf("ELF-load:");
142	/* Identify ELF */	139	/* Identify ELF */
143	if (header->e_ident[EI_MAG0] != ELFMAG0 \|\|	140	if (header->e_ident[EI_MAG0] != ELFMAG0 \|\|
144	header->e_ident[EI_MAG1] != ELFMAG1 \|\|	141	header->e_ident[EI_MAG1] != ELFMAG1 \|\|
145	header->e_ident[EI_MAG2] != ELFMAG2 \|\|	142	header->e_ident[EI_MAG2] != ELFMAG2 \|\|
146	header->e_ident[EI_MAG3] != ELFMAG3) {	143	header->e_ident[EI_MAG3] != ELFMAG3) {
147	printf("invalid header\n");	144	printf("invalid header\n");
148	return EE_INVALID;	145	return EE_INVALID;
149	}	146	}
150		147
151	/* Identify ELF compatibility */	148	/* Identify ELF compatibility */
152	if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING \|\|	149	if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING \|\|
153	header->e_machine != ELF_MACHINE \|\|	150	header->e_machine != ELF_MACHINE \|\|
154	header->e_ident[EI_VERSION] != EV_CURRENT \|\|	151	header->e_ident[EI_VERSION] != EV_CURRENT \|\|
155	header->e_version != EV_CURRENT \|\|	152	header->e_version != EV_CURRENT \|\|
156	header->e_ident[EI_CLASS] != ELF_CLASS) {	153	header->e_ident[EI_CLASS] != ELF_CLASS) {
157	printf("incompatible data/version/class\n");	154	printf("incompatible data/version/class\n");
158	return EE_INCOMPATIBLE;	155	return EE_INCOMPATIBLE;
159	}	156	}
160		157
161	if (header->e_phentsize != sizeof(elf_segment_header_t))	158	if (header->e_phentsize != sizeof(elf_segment_header_t))
162	return EE_INCOMPATIBLE;	159	return EE_INCOMPATIBLE;
163		160
164	if (header->e_shentsize != sizeof(elf_section_header_t))	161	if (header->e_shentsize != sizeof(elf_section_header_t))
165	return EE_INCOMPATIBLE;	162	return EE_INCOMPATIBLE;
166		163
167	/* Check if the object type is supported. */	164	/* Check if the object type is supported. */
168	if (header->e_type != ET_EXEC && header->e_type != ET_DYN) {	165	if (header->e_type != ET_EXEC && header->e_type != ET_DYN) {
169	printf("Object type %d is not supported\n", header->e_type);	166	printf("Object type %d is not supported\n", header->e_type);
170	return EE_UNSUPPORTED;	167	return EE_UNSUPPORTED;
171	}	168	}
172		169
173	/* The run-time dynamic linker is loaded with a bias */	170	/* Shared objects can be loaded with a bias */
174	printf("Object type: %d\n", header->e_type);	171	printf("Object type: %d\n", header->e_type);
175	if (header->e_type == ET_DYN)	172	if (header->e_type == ET_DYN)
176	elf->bias = RTLD_BIAS;	173	elf->bias = so_bias;
177	else	174	else
178	elf->bias = 0;	175	elf->bias = 0;
179		176
180	printf("Bias set to 0x%d\n", elf->bias);	177	printf("Bias set to 0x%x\n", elf->bias);
181		178
182	printf("parse segments\n");	179	printf("parse segments\n");
183		180
184	/* Walk through all segment headers and process them. */	181	/* Walk through all segment headers and process them. */
185	for (i = 0; i < header->e_phnum; i++) {	182	for (i = 0; i < header->e_phnum; i++) {
186	elf_segment_header_t segment_hdr;	183	elf_segment_header_t segment_hdr;
187		184
188	/* Seek to start of segment header */	185	/* Seek to start of segment header */
189	lseek(elf->fd, header->e_phoff	186	lseek(elf->fd, header->e_phoff
190	+ i * sizeof(elf_segment_header_t), SEEK_SET);	187	+ i * sizeof(elf_segment_header_t), SEEK_SET);
191		188
192	rc = read(elf->fd, &segment_hdr, sizeof(elf_segment_header_t));	189	rc = read(elf->fd, &segment_hdr, sizeof(elf_segment_header_t));
193	if (rc < 0) { printf("read error\n"); return EE_INVALID; }	190	if (rc < 0) { printf("read error\n"); return EE_INVALID; }
194		191
195	rc = segment_header(elf, &segment_hdr);	192	rc = segment_header(elf, &segment_hdr);
196	if (rc != EE_OK)	193	if (rc != EE_OK)
197	return rc;	194	return rc;
198	}	195	}
199		196
200	printf("parse sections\n");	197	printf("parse sections\n");
201		198
202	/* Inspect all section headers and proccess them. */	199	/* Inspect all section headers and proccess them. */
203	for (i = 0; i < header->e_shnum; i++) {	200	for (i = 0; i < header->e_shnum; i++) {
204	elf_section_header_t section_hdr;	201	elf_section_header_t section_hdr;
205		202
206	/* Seek to start of section header */	203	/* Seek to start of section header */
207	lseek(elf->fd, header->e_shoff	204	lseek(elf->fd, header->e_shoff
208	+ i * sizeof(elf_section_header_t), SEEK_SET);	205	+ i * sizeof(elf_section_header_t), SEEK_SET);
209		206
210	rc = read(elf->fd, &section_hdr, sizeof(elf_section_header_t));	207	rc = read(elf->fd, &section_hdr, sizeof(elf_section_header_t));
211	if (rc < 0) { printf("read error\n"); return EE_INVALID; }	208	if (rc < 0) { printf("read error\n"); return EE_INVALID; }
212		209
213	rc = section_header(elf, &section_hdr);	210	rc = section_header(elf, &section_hdr);
214	if (rc != EE_OK)	211	if (rc != EE_OK)
215	return rc;	212	return rc;
216	}	213	}
217		214
218	elf->info->entry =	215	elf->info->entry =
219	(entry_point_t)((uint8_t *)header->e_entry + elf->bias);	216	(entry_point_t)((uint8_t *)header->e_entry + elf->bias);
220		217
221	printf("done\n");	218	printf("done\n");
222		219
223	return EE_OK;	220	return EE_OK;
224	}	221	}
225		222
226	/** Print error message according to error code.	223	/** Print error message according to error code.
227	*	224	*
228	* @param rc Return code returned by elf_load().	225	* @param rc Return code returned by elf_load().
229	*	226	*
230	* @return NULL terminated description of error.	227	* @return NULL terminated description of error.
231	*/	228	*/
232	char *elf_error(unsigned int rc)	229	char *elf_error(unsigned int rc)
233	{	230	{
234	assert(rc < sizeof(error_codes) / sizeof(char *));	231	assert(rc < sizeof(error_codes) / sizeof(char *));
235		232
236	return error_codes[rc];	233	return error_codes[rc];
237	}	234	}
238		235
239	/** Process segment header.	236	/** Process segment header.
240	*	237	*
241	* @param entry Segment header.	238	* @param entry Segment header.
242	* @param elf ELF header.	239	* @param elf ELF header.
243	*	240	*
244	* @return EE_OK on success, error code otherwise.	241	* @return EE_OK on success, error code otherwise.
245	*/	242	*/
246	static int segment_header(elf_ld_t elf, elf_segment_header_t entry)	243	static int segment_header(elf_ld_t elf, elf_segment_header_t entry)
247	{	244	{
248	switch (entry->p_type) {	245	switch (entry->p_type) {
249	case PT_NULL:	246	case PT_NULL:
250	case PT_PHDR:	247	case PT_PHDR:
251	break;	248	break;
252	case PT_LOAD:	249	case PT_LOAD:
253	return load_segment(elf, entry);	250	return load_segment(elf, entry);
254	break;	251	break;
255	case PT_DYNAMIC:	252	case PT_DYNAMIC:
256	case PT_INTERP:	253	case PT_INTERP:
257	case PT_SHLIB:	254	case PT_SHLIB:
258	case PT_NOTE:	255	case PT_NOTE:
259	case PT_LOPROC:	256	case PT_LOPROC:
260	case PT_HIPROC:	257	case PT_HIPROC:
261	default:	258	default:
262	printf("segment p_type %d unknown\n", entry->p_type);	259	printf("segment p_type %d unknown\n", entry->p_type);
263	return EE_UNSUPPORTED;	260	return EE_UNSUPPORTED;
264	break;	261	break;
265	}	262	}
266	return EE_OK;	263	return EE_OK;
267	}	264	}
268		265
269	/** Load segment described by program header entry.	266	/** Load segment described by program header entry.
270	*	267	*
271	* @param entry Program header entry describing segment to be loaded.	268	* @param entry Program header entry describing segment to be loaded.
272	* @param elf ELF header.	269	* @param elf ELF header.
273	*	270	*
274	* @return EE_OK on success, error code otherwise.	271	* @return EE_OK on success, error code otherwise.
275	*/	272	*/
276	int load_segment(elf_ld_t elf, elf_segment_header_t entry)	273	int load_segment(elf_ld_t elf, elf_segment_header_t entry)
277	{	274	{
278	void *a;	275	void *a;
279	int flags = 0;	276	int flags = 0;
280	uintptr_t bias;	277	uintptr_t bias;
281	int rc;	278	int rc;
282		279
283	printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr,	280	printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr,
284	entry->p_memsz);	281	entry->p_memsz);
285		282
286	bias = elf->bias;	283	bias = elf->bias;
287		284
288	if (entry->p_align > 1) {	285	if (entry->p_align > 1) {
289	if ((entry->p_offset % entry->p_align) !=	286	if ((entry->p_offset % entry->p_align) !=
290	(entry->p_vaddr % entry->p_align)) {	287	(entry->p_vaddr % entry->p_align)) {
291	printf("align check 1 failed offset%%align=%d, vaddr%%align=%d\n",	288	printf("align check 1 failed offset%%align=%d, vaddr%%align=%d\n",
292	entry->p_offset % entry->p_align,	289	entry->p_offset % entry->p_align,
293	entry->p_vaddr % entry->p_align	290	entry->p_vaddr % entry->p_align
294	);	291	);
295	return EE_INVALID;	292	return EE_INVALID;
296	}	293	}
297	}	294	}
298		295
299	/* if (entry->p_flags & PF_X)	296	/* if (entry->p_flags & PF_X)
300	flags \|= AS_AREA_EXEC;	297	flags \|= AS_AREA_EXEC;
301	if (entry->p_flags & PF_W)	298	if (entry->p_flags & PF_W)
302	flags \|= AS_AREA_WRITE;	299	flags \|= AS_AREA_WRITE;
303	if (entry->p_flags & PF_R)	300	if (entry->p_flags & PF_R)
304	flags \|= AS_AREA_READ;	301	flags \|= AS_AREA_READ;
305	flags \|= AS_AREA_CACHEABLE;	302	flags \|= AS_AREA_CACHEABLE;
306	*/	303	*/
307	/* FIXME: Kernel won't normally allow this, unless you "patch" it */	304	/* FIXME: Kernel won't normally allow this, unless you "patch" it */
308	// flags = AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_EXEC \| AS_AREA_CACHEABLE;	305	// flags = AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_EXEC \| AS_AREA_CACHEABLE;
309	flags = AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE;	306	flags = AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE;
310		307
311	/*	308	/*
312	* Check if the virtual address starts on page boundary.	309	* Check if the virtual address starts on page boundary.
313	*/	310	*/
314	if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) {	311	if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) {
315	printf("align check 2 failed - not page-aligned\n");	312	printf("align check 2 failed - not page-aligned\n");
316	printf("vaddr = 0x%x, should be 0x%x\n",	313	printf("vaddr = 0x%x, should be 0x%x\n",
317	entry->p_vaddr, ALIGN_UP(entry->p_vaddr, PAGE_SIZE));	314	entry->p_vaddr, ALIGN_UP(entry->p_vaddr, PAGE_SIZE));
318	return EE_UNSUPPORTED;	315	return EE_UNSUPPORTED;
319	}	316	}
320		317
321	printf("map to p_vaddr=0x%x-0x%x...\n", entry->p_vaddr + bias,	318	printf("map to p_vaddr=0x%x-0x%x...\n", entry->p_vaddr + bias,
322	entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE));	319	entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE));
323		320
324	a = as_area_create((uint8_t *)entry->p_vaddr + bias,	321	a = as_area_create((uint8_t *)entry->p_vaddr + bias,
325	entry->p_memsz, flags);	322	entry->p_memsz, flags);
326	if (a == (void *)(-1)) {	323	if (a == (void *)(-1)) {
327	printf("memory mapping failed\n");	324	printf("memory mapping failed\n");
328	return EE_MEMORY;	325	return EE_MEMORY;
329	}	326	}
330		327
331	printf("as_area_create(0x%x, 0x%x, %d) -> 0x%x\n",	328	printf("as_area_create(0x%x, 0x%x, %d) -> 0x%x\n",
332	entry->p_vaddr+bias, entry->p_memsz, flags, (unsigned)a);	329	entry->p_vaddr+bias, entry->p_memsz, flags, (unsigned)a);
333		330
334	/*	331	/*
335	* Load segment data	332	* Load segment data
336	*/	333	*/
337	printf("seek to %d\n", entry->p_offset);	334	printf("seek to %d\n", entry->p_offset);
338	rc = lseek(elf->fd, entry->p_offset, SEEK_SET);	335	rc = lseek(elf->fd, entry->p_offset, SEEK_SET);
339	if (rc < 0) { printf("seek error\n"); return EE_INVALID; }	336	if (rc < 0) { printf("seek error\n"); return EE_INVALID; }
340		337
341	printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias);	338	printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias);
342	/* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz);	339	/* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz);
343	if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/	340	if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/
344	unsigned left, now;	341	unsigned left, now;
345	uint8_t *dp;	342	uint8_t *dp;
346		343
347	left = entry->p_filesz;	344	left = entry->p_filesz;
348	dp = (uint8_t *)(entry->p_vaddr + bias);	345	dp = (uint8_t *)(entry->p_vaddr + bias);
349		346
350	while (left > 0) {	347	while (left > 0) {
351	now = 4096;	348	now = 4096;
352	if (now > left) now=left;	349	if (now > left) now=left;
353	printf("read %d...", now);	350	printf("read %d...", now);
354	rc = read(elf->fd, dp, now);	351	rc = read(elf->fd, dp, now);
355	if (rc < 0) { printf("read error\n"); return EE_INVALID; }	352	if (rc < 0) { printf("read error\n"); return EE_INVALID; }
356	printf("->%d\n", rc);	353	printf("->%d\n", rc);
357	left -= now;	354	left -= now;
358	dp += now;	355	dp += now;
359	}	356	}
360		357
361	return EE_OK;	358	return EE_OK;
362	}	359	}
363		360
364	/** Process section header.	361	/** Process section header.
365	*	362	*
366	* @param entry Segment header.	363	* @param entry Segment header.
367	* @param elf ELF header.	364	* @param elf ELF header.
368	*	365	*
369	* @return EE_OK on success, error code otherwise.	366	* @return EE_OK on success, error code otherwise.
370	*/	367	*/
371	static int section_header(elf_ld_t elf, elf_section_header_t entry)	368	static int section_header(elf_ld_t elf, elf_section_header_t entry)
372	{	369	{
373	switch (entry->sh_type) {	370	switch (entry->sh_type) {
374	case SHT_PROGBITS:	371	case SHT_PROGBITS:
375	if (entry->sh_flags & SHF_TLS) {	372	if (entry->sh_flags & SHF_TLS) {
376	/* .tdata */	373	/* .tdata */
377	}	374	}
378	break;	375	break;
379	case SHT_NOBITS:	376	case SHT_NOBITS:
380	if (entry->sh_flags & SHF_TLS) {	377	if (entry->sh_flags & SHF_TLS) {
381	/* .tbss */	378	/* .tbss */
382	}	379	}
383	break;	380	break;
384	case SHT_DYNAMIC:	381	case SHT_DYNAMIC:
385	elf->info->dynamic =	382	elf->info->dynamic =
386	(void )((uint8_t )entry->sh_addr + elf->bias);	383	(void )((uint8_t )entry->sh_addr + elf->bias);
387	printf("dynamic section found at 0x%x\n",	384	printf("dynamic section found at 0x%x\n",
388	(uintptr_t)elf->info->dynamic);	385	(uintptr_t)elf->info->dynamic);
389	break;	386	break;
390	default:	387	default:
391	break;	388	break;
392	}	389	}
393		390
394	return EE_OK;	391	return EE_OK;
395	}	392	}
396		393
397	/** @}	394	/** @}
398	*/	395	*/
399		396

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(root)/branches/dynload/uspace/app/iloader/elf_load.c – Rev 2971 → 2972