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"
 
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;
 
    /* Final flags for the memory area */
 
    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));
 
    /*
     * For the course of loading, the area needs to be readable
     * and writeable.
     */
    a = as_area_create((uint8_t *)entry->p_vaddr + bias,
        entry->p_memsz, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE);
    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 = 16384;
        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;
    }
 
    printf("set area flags to %d\n", flags);
    rc = as_area_change_flags((uint8_t *)entry->p_vaddr + bias, flags);
    if (rc != 0) {
        printf("failed to set memory area flags\n");
        return EE_MEMORY;
    }
 
    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 2977	Rev 2985
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	static char *error_codes[] = {	52	static char *error_codes[] = {
53	"no error",	53	"no error",
54	"invalid image",	54	"invalid image",
55	"address space error",	55	"address space error",
56	"incompatible image",	56	"incompatible image",
57	"unsupported image type",	57	"unsupported image type",
58	"irrecoverable error"	58	"irrecoverable error"
59	};	59	};
60		60
61	static unsigned int elf_load(elf_ld_t *elf, size_t so_bias);	61	static unsigned int elf_load(elf_ld_t *elf, size_t so_bias);
62	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);
63	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);
64	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);
65		65
66	int elf_load_file(char file_name, size_t so_bias, elf_info_t info)	66	int elf_load_file(char file_name, size_t so_bias, elf_info_t info)
67	{	67	{
68	elf_ld_t elf;	68	elf_ld_t elf;
69		69
70	int fd;	70	int fd;
71	int rc;	71	int rc;
72		72
73	printf("open and read '%s'...\n", file_name);	73	printf("open and read '%s'...\n", file_name);
74		74
75	fd = open(file_name, 0);	75	fd = open(file_name, 0);
76	if (fd < 0) {	76	if (fd < 0) {
77	printf("failed opening file\n");	77	printf("failed opening file\n");
78	return -1;	78	return -1;
79	}	79	}
80		80
81	elf.fd = fd;	81	elf.fd = fd;
82	elf.info = info;	82	elf.info = info;
83		83
84	rc = elf_load(&elf, so_bias);	84	rc = elf_load(&elf, so_bias);
85	printf("elf_load() -> %d\n", rc);	85	printf("elf_load() -> %d\n", rc);
86		86
87	close(fd);	87	close(fd);
88		88
89	return rc;	89	return rc;
90	}	90	}
91		91
92	void elf_run(elf_info_t *info)	92	void elf_run(elf_info_t *info)
93	{	93	{
94	(*info->entry)();	94	(*info->entry)();
95		95
96	/* not reached */	96	/* not reached */
97	}	97	}
98		98
99	int elf_create_pcb(elf_info_t *info)	99	int elf_create_pcb(elf_info_t *info)
100	{	100	{
101	pcb_t *pcb;	101	pcb_t *pcb;
102	void *a;	102	void *a;
103		103
104	pcb = (pcb_t *)PCB_ADDRESS;	104	pcb = (pcb_t *)PCB_ADDRESS;
105		105
106	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);
107	if (a == (void *)(-1)) {	107	if (a == (void *)(-1)) {
108	printf("elf_create_pcb: memory mapping failed\n");	108	printf("elf_create_pcb: memory mapping failed\n");
109	return EE_MEMORY;	109	return EE_MEMORY;
110	}	110	}
111		111
112	pcb->entry = info->entry;	112	pcb->entry = info->entry;
113	pcb->dynamic = info->dynamic;	113	pcb->dynamic = info->dynamic;
114		114
115	return 0;	115	return 0;
116	}	116	}
117		117
118		118
119	/** ELF loader	119	/** ELF loader
120	*	120	*
121	* @param header Pointer to ELF header in memory	121	* @param header Pointer to ELF header in memory
122	* @return EE_OK on success	122	* @return EE_OK on success
123	*/	123	*/
124	static unsigned int elf_load(elf_ld_t *elf, size_t so_bias)	124	static unsigned int elf_load(elf_ld_t *elf, size_t so_bias)
125	{	125	{
126	elf_header_t header_buf;	126	elf_header_t header_buf;
127	elf_header_t *header = &header_buf;	127	elf_header_t *header = &header_buf;
128	int i, rc;	128	int i, rc;
129		129
130	rc = read(elf->fd, header, sizeof(elf_header_t));	130	rc = read(elf->fd, header, sizeof(elf_header_t));
131	if (rc < 0) {	131	if (rc < 0) {
132	printf("read error\n");	132	printf("read error\n");
133	return EE_INVALID;	133	return EE_INVALID;
134	}	134	}
135		135
136	elf->header = header;	136	elf->header = header;
137		137
138	printf("ELF-load:");	138	printf("ELF-load:");
139	/* Identify ELF */	139	/* Identify ELF */
140	if (header->e_ident[EI_MAG0] != ELFMAG0 \|\|	140	if (header->e_ident[EI_MAG0] != ELFMAG0 \|\|
141	header->e_ident[EI_MAG1] != ELFMAG1 \|\|	141	header->e_ident[EI_MAG1] != ELFMAG1 \|\|
142	header->e_ident[EI_MAG2] != ELFMAG2 \|\|	142	header->e_ident[EI_MAG2] != ELFMAG2 \|\|
143	header->e_ident[EI_MAG3] != ELFMAG3) {	143	header->e_ident[EI_MAG3] != ELFMAG3) {
144	printf("invalid header\n");	144	printf("invalid header\n");
145	return EE_INVALID;	145	return EE_INVALID;
146	}	146	}
147		147
148	/* Identify ELF compatibility */	148	/* Identify ELF compatibility */
149	if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING \|\|	149	if (header->e_ident[EI_DATA] != ELF_DATA_ENCODING \|\|
150	header->e_machine != ELF_MACHINE \|\|	150	header->e_machine != ELF_MACHINE \|\|
151	header->e_ident[EI_VERSION] != EV_CURRENT \|\|	151	header->e_ident[EI_VERSION] != EV_CURRENT \|\|
152	header->e_version != EV_CURRENT \|\|	152	header->e_version != EV_CURRENT \|\|
153	header->e_ident[EI_CLASS] != ELF_CLASS) {	153	header->e_ident[EI_CLASS] != ELF_CLASS) {
154	printf("incompatible data/version/class\n");	154	printf("incompatible data/version/class\n");
155	return EE_INCOMPATIBLE;	155	return EE_INCOMPATIBLE;
156	}	156	}
157		157
158	if (header->e_phentsize != sizeof(elf_segment_header_t))	158	if (header->e_phentsize != sizeof(elf_segment_header_t))
159	return EE_INCOMPATIBLE;	159	return EE_INCOMPATIBLE;
160		160
161	if (header->e_shentsize != sizeof(elf_section_header_t))	161	if (header->e_shentsize != sizeof(elf_section_header_t))
162	return EE_INCOMPATIBLE;	162	return EE_INCOMPATIBLE;
163		163
164	/* Check if the object type is supported. */	164	/* Check if the object type is supported. */
165	if (header->e_type != ET_EXEC && header->e_type != ET_DYN) {	165	if (header->e_type != ET_EXEC && header->e_type != ET_DYN) {
166	printf("Object type %d is not supported\n", header->e_type);	166	printf("Object type %d is not supported\n", header->e_type);
167	return EE_UNSUPPORTED;	167	return EE_UNSUPPORTED;
168	}	168	}
169		169
170	/* Shared objects can be loaded with a bias */	170	/* Shared objects can be loaded with a bias */
171	printf("Object type: %d\n", header->e_type);	171	printf("Object type: %d\n", header->e_type);
172	if (header->e_type == ET_DYN)	172	if (header->e_type == ET_DYN)
173	elf->bias = so_bias;	173	elf->bias = so_bias;
174	else	174	else
175	elf->bias = 0;	175	elf->bias = 0;
176		176
177	printf("Bias set to 0x%x\n", elf->bias);	177	printf("Bias set to 0x%x\n", elf->bias);
178		178
179	printf("parse segments\n");	179	printf("parse segments\n");
180		180
181	/* Walk through all segment headers and process them. */	181	/* Walk through all segment headers and process them. */
182	for (i = 0; i < header->e_phnum; i++) {	182	for (i = 0; i < header->e_phnum; i++) {
183	elf_segment_header_t segment_hdr;	183	elf_segment_header_t segment_hdr;
184		184
185	/* Seek to start of segment header */	185	/* Seek to start of segment header */
186	lseek(elf->fd, header->e_phoff	186	lseek(elf->fd, header->e_phoff
187	+ i * sizeof(elf_segment_header_t), SEEK_SET);	187	+ i * sizeof(elf_segment_header_t), SEEK_SET);
188		188
189	rc = read(elf->fd, &segment_hdr, sizeof(elf_segment_header_t));	189	rc = read(elf->fd, &segment_hdr, sizeof(elf_segment_header_t));
190	if (rc < 0) { printf("read error\n"); return EE_INVALID; }	190	if (rc < 0) { printf("read error\n"); return EE_INVALID; }
191		191
192	rc = segment_header(elf, &segment_hdr);	192	rc = segment_header(elf, &segment_hdr);
193	if (rc != EE_OK)	193	if (rc != EE_OK)
194	return rc;	194	return rc;
195	}	195	}
196		196
197	printf("parse sections\n");	197	printf("parse sections\n");
198		198
199	/* Inspect all section headers and proccess them. */	199	/* Inspect all section headers and proccess them. */
200	for (i = 0; i < header->e_shnum; i++) {	200	for (i = 0; i < header->e_shnum; i++) {
201	elf_section_header_t section_hdr;	201	elf_section_header_t section_hdr;
202		202
203	/* Seek to start of section header */	203	/* Seek to start of section header */
204	lseek(elf->fd, header->e_shoff	204	lseek(elf->fd, header->e_shoff
205	+ i * sizeof(elf_section_header_t), SEEK_SET);	205	+ i * sizeof(elf_section_header_t), SEEK_SET);
206		206
207	rc = read(elf->fd, &section_hdr, sizeof(elf_section_header_t));	207	rc = read(elf->fd, &section_hdr, sizeof(elf_section_header_t));
208	if (rc < 0) { printf("read error\n"); return EE_INVALID; }	208	if (rc < 0) { printf("read error\n"); return EE_INVALID; }
209		209
210	rc = section_header(elf, &section_hdr);	210	rc = section_header(elf, &section_hdr);
211	if (rc != EE_OK)	211	if (rc != EE_OK)
212	return rc;	212	return rc;
213	}	213	}
214		214
215	elf->info->entry =	215	elf->info->entry =
216	(entry_point_t)((uint8_t *)header->e_entry + elf->bias);	216	(entry_point_t)((uint8_t *)header->e_entry + elf->bias);
217		217
218	printf("done\n");	218	printf("done\n");
219		219
220	return EE_OK;	220	return EE_OK;
221	}	221	}
222		222
223	/** Print error message according to error code.	223	/** Print error message according to error code.
224	*	224	*
225	* @param rc Return code returned by elf_load().	225	* @param rc Return code returned by elf_load().
226	*	226	*
227	* @return NULL terminated description of error.	227	* @return NULL terminated description of error.
228	*/	228	*/
229	char *elf_error(unsigned int rc)	229	char *elf_error(unsigned int rc)
230	{	230	{
231	assert(rc < sizeof(error_codes) / sizeof(char *));	231	assert(rc < sizeof(error_codes) / sizeof(char *));
232		232
233	return error_codes[rc];	233	return error_codes[rc];
234	}	234	}
235		235
236	/** Process segment header.	236	/** Process segment header.
237	*	237	*
238	* @param entry Segment header.	238	* @param entry Segment header.
239	* @param elf ELF header.	239	* @param elf ELF header.
240	*	240	*
241	* @return EE_OK on success, error code otherwise.	241	* @return EE_OK on success, error code otherwise.
242	*/	242	*/
243	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)
244	{	244	{
245	switch (entry->p_type) {	245	switch (entry->p_type) {
246	case PT_NULL:	246	case PT_NULL:
247	case PT_PHDR:	247	case PT_PHDR:
248	break;	248	break;
249	case PT_LOAD:	249	case PT_LOAD:
250	return load_segment(elf, entry);	250	return load_segment(elf, entry);
251	break;	251	break;
252	case PT_DYNAMIC:	252	case PT_DYNAMIC:
253	case PT_INTERP:	253	case PT_INTERP:
254	case PT_SHLIB:	254	case PT_SHLIB:
255	case PT_NOTE:	255	case PT_NOTE:
256	case PT_LOPROC:	256	case PT_LOPROC:
257	case PT_HIPROC:	257	case PT_HIPROC:
258	default:	258	default:
259	printf("segment p_type %d unknown\n", entry->p_type);	259	printf("segment p_type %d unknown\n", entry->p_type);
260	return EE_UNSUPPORTED;	260	return EE_UNSUPPORTED;
261	break;	261	break;
262	}	262	}
263	return EE_OK;	263	return EE_OK;
264	}	264	}
265		265
266	/** Load segment described by program header entry.	266	/** Load segment described by program header entry.
267	*	267	*
268	* @param entry Program header entry describing segment to be loaded.	268	* @param entry Program header entry describing segment to be loaded.
269	* @param elf ELF header.	269	* @param elf ELF header.
270	*	270	*
271	* @return EE_OK on success, error code otherwise.	271	* @return EE_OK on success, error code otherwise.
272	*/	272	*/
273	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)
274	{	274	{
275	void *a;	275	void *a;
276	int flags = 0;	276	int flags = 0;
277	uintptr_t bias;	277	uintptr_t bias;
278	int rc;	278	int rc;
279		279
280	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,
281	entry->p_memsz);	281	entry->p_memsz);
282		282
283	bias = elf->bias;	283	bias = elf->bias;
284		284
285	if (entry->p_align > 1) {	285	if (entry->p_align > 1) {
286	if ((entry->p_offset % entry->p_align) !=	286	if ((entry->p_offset % entry->p_align) !=
287	(entry->p_vaddr % entry->p_align)) {	287	(entry->p_vaddr % entry->p_align)) {
288	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",
289	entry->p_offset % entry->p_align,	289	entry->p_offset % entry->p_align,
290	entry->p_vaddr % entry->p_align	290	entry->p_vaddr % entry->p_align
291	);	291	);
292	return EE_INVALID;	292	return EE_INVALID;
293	}	293	}
294	}	294	}
295		295
296	/* if (entry->p_flags & PF_X)	296	if (entry->p_flags & PF_X)
297	flags \|= AS_AREA_EXEC;	297	flags \|= AS_AREA_EXEC;
298	if (entry->p_flags & PF_W)	298	if (entry->p_flags & PF_W)
299	flags \|= AS_AREA_WRITE;	299	flags \|= AS_AREA_WRITE;
300	if (entry->p_flags & PF_R)	300	if (entry->p_flags & PF_R)
301	flags \|= AS_AREA_READ;	301	flags \|= AS_AREA_READ;
302	flags \|= AS_AREA_CACHEABLE;	302	flags \|= AS_AREA_CACHEABLE;
303	*/	303
304	/* FIXME: Kernel won't normally allow this, unless you "patch" it */	304	/* Final flags for the memory area */
305	// flags = AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_EXEC \| AS_AREA_CACHEABLE;	-
306	flags = AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE;	305	flags = AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE;
307		306
308	/*	307	/*
309	* Check if the virtual address starts on page boundary.	308	* Check if the virtual address starts on page boundary.
310	*/	309	*/
311	if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) {	310	if (ALIGN_UP(entry->p_vaddr, PAGE_SIZE) != entry->p_vaddr) {
312	printf("align check 2 failed - not page-aligned\n");	311	printf("align check 2 failed - not page-aligned\n");
313	printf("vaddr = 0x%x, should be 0x%x\n",	312	printf("vaddr = 0x%x, should be 0x%x\n",
314	entry->p_vaddr, ALIGN_UP(entry->p_vaddr, PAGE_SIZE));	313	entry->p_vaddr, ALIGN_UP(entry->p_vaddr, PAGE_SIZE));
315	return EE_UNSUPPORTED;	314	return EE_UNSUPPORTED;
316	}	315	}
317		316
318	printf("map to p_vaddr=0x%x-0x%x...\n", entry->p_vaddr + bias,	317	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));	318	entry->p_vaddr + bias + ALIGN_UP(entry->p_memsz, PAGE_SIZE));
320		319
-		320	/*
-		321	* For the course of loading, the area needs to be readable
-		322	* and writeable.
-		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, AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE);
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 = 16384;	351	now = 16384;
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	}
-		360
-		361	printf("set area flags to %d\n", flags);
-		362	rc = as_area_change_flags((uint8_t *)entry->p_vaddr + bias, flags);
-		363	if (rc != 0) {
-		364	printf("failed to set memory area flags\n");
-		365	return EE_MEMORY;
-		366	}
357		367
358	return EE_OK;	368	return EE_OK;
359	}	369	}
360		370
361	/** Process section header.	371	/** Process section header.
362	*	372	*
363	* @param entry Segment header.	373	* @param entry Segment header.
364	* @param elf ELF header.	374	* @param elf ELF header.
365	*	375	*
366	* @return EE_OK on success, error code otherwise.	376	* @return EE_OK on success, error code otherwise.
367	*/	377	*/
368	static int section_header(elf_ld_t elf, elf_section_header_t entry)	378	static int section_header(elf_ld_t elf, elf_section_header_t entry)
369	{	379	{
370	switch (entry->sh_type) {	380	switch (entry->sh_type) {
371	case SHT_PROGBITS:	381	case SHT_PROGBITS:
372	if (entry->sh_flags & SHF_TLS) {	382	if (entry->sh_flags & SHF_TLS) {
373	/* .tdata */	383	/* .tdata */
374	}	384	}
375	break;	385	break;
376	case SHT_NOBITS:	386	case SHT_NOBITS:
377	if (entry->sh_flags & SHF_TLS) {	387	if (entry->sh_flags & SHF_TLS) {
378	/* .tbss */	388	/* .tbss */
379	}	389	}
380	break;	390	break;
381	case SHT_DYNAMIC:	391	case SHT_DYNAMIC:
382	elf->info->dynamic =	392	elf->info->dynamic =
383	(void )((uint8_t )entry->sh_addr + elf->bias);	393	(void )((uint8_t )entry->sh_addr + elf->bias);
384	printf("dynamic section found at 0x%x\n",	394	printf("dynamic section found at 0x%x\n",
385	(uintptr_t)elf->info->dynamic);	395	(uintptr_t)elf->info->dynamic);
386	break;	396	break;
387	default:	397	default:
388	break;	398	break;
389	}	399	}
390		400
391	return EE_OK;	401	return EE_OK;
392	}	402	}
393		403
394	/** @}	404	/** @}
395	*/	405	*/
396		406

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(root)/branches/dynload/uspace/srv/loader/elf_load.c @ 3772 – Rev 2977 → 2985