| 1 | /*
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| 2 | * Copyright (c) 2016 Jiri Svoboda
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libc
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | /**
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| 34 | * @file
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| 35 | * @brief Userspace ELF loader.
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| 36 | */
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| 37 |
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| 38 | #include <elf/elf_load.h>
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| 39 | #include <elf/elf_mod.h>
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| 40 | #include <errno.h>
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| 41 | #include <stdio.h>
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| 42 | #include <stdlib.h>
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| 43 | #include <vfs/vfs.h>
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| 44 |
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| 45 | #ifdef CONFIG_RTLD
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| 46 | #include <rtld/rtld.h>
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| 47 | #endif
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| 48 |
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| 49 | #define DPRINTF(...)
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| 50 |
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| 51 | /** Load ELF program.
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| 52 | *
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| 53 | * @param file File handle
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| 54 | * @param info Place to store ELF program information
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| 55 | * @return EE_OK on success or an EE_x error code
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| 56 | */
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| 57 | int elf_load(int file, elf_info_t *info)
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| 58 | {
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| 59 | #ifdef CONFIG_RTLD
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| 60 | rtld_t *env;
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| 61 | #endif
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| 62 | int rc;
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| 63 |
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| 64 | rc = elf_load_file(file, 0, &info->finfo);
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| 65 | if (rc != EE_OK) {
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| 66 | DPRINTF("Failed to load executable '%s'.\n", file_name);
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| 67 | return rc;
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| 68 | }
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| 69 |
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| 70 | if (info->finfo.dynamic == NULL) {
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| 71 | /* Statically linked program */
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| 72 | DPRINTF("Binary is statically linked.\n");
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| 73 | info->env = NULL;
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| 74 | return EE_OK;
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| 75 | }
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| 76 |
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| 77 | DPRINTF("Binary is dynamically linked.\n");
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| 78 | #ifdef CONFIG_RTLD
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| 79 | DPRINTF("- prog dynamic: %p\n", info->finfo.dynamic);
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| 80 |
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| 81 | errno_t rc2 = rtld_prog_process(&info->finfo, &env);
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| 82 | switch (rc2) {
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| 83 | case EOK:
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| 84 | rc = EE_OK;
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| 85 | break;
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| 86 | case ENOMEM:
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| 87 | rc = EE_MEMORY;
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| 88 | break;
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| 89 | default:
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| 90 | DPRINTF("Unexpected error code from rtld_prog_process(): %s\n", str_error_name(rc2));
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| 91 | rc = EE_INVALID;
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| 92 | }
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| 93 |
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| 94 | info->env = env;
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| 95 | #else
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| 96 | rc = EE_UNSUPPORTED;
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| 97 | #endif
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| 98 | return rc;
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| 99 | }
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| 100 |
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| 101 | /** Set ELF-related PCB entries.
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| 102 | *
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| 103 | * Fills the program control block @a pcb with information from
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| 104 | * @a info.
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| 105 | *
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| 106 | * @param info Program info structure
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| 107 | * @param pcb PCB
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| 108 | */
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| 109 | void elf_set_pcb(elf_info_t *info, pcb_t *pcb)
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| 110 | {
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| 111 | pcb->entry = info->finfo.entry;
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| 112 | pcb->dynamic = info->finfo.dynamic;
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| 113 | pcb->rtld_runtime = info->env;
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| 114 | }
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| 115 |
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| 116 | /** @}
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| 117 | */
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