Merged kernel support for ELF executable format from karolina.lindqvist.
Now kernel can directly run executables generated by gcc.
This commit is contained in:
Serge Vakulenko
207
sys/kernel/exec_elf.c
Normal file
207
sys/kernel/exec_elf.c
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@@ -0,0 +1,207 @@
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/* $NetBSD: exec_elf32.c,v 1.49.2.2 2000/11/03 20:00:38 tv Exp $ */
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/*-
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* Copyright (c) 1994 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1996 Christopher G. Demetriou
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "param.h"
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#include "systm.h"
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#include "kernel.h"
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#include "map.h"
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#include "user.h"
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#include "proc.h"
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//#include "malloc.h"
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#include "inode.h"
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#include "namei.h"
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//#include "vnode.h"
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#include "exec.h"
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#include "exec_elf.h"
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#include "fcntl.h"
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//#include "syscall.h"
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#include "signalvar.h"
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#include "mount.h"
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#include "stat.h"
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extern char sigcode[], esigcode[];
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/* round up and down to page boundaries. */
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#define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1))
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#define ELF_TRUNC(a, b) ((a) & ~((b) - 1))
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/*
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* elf_check(): Prepare an Elf binary's exec package
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*
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* First, set of the various offsets/lengths in the exec package.
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*
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* Then, mark the text image busy (so it can be demand paged) or error
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* out if this is not possible. Finally, set up vmcmds for the
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* text, data, bss, and stack segments.
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*/
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int
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exec_elf_check(struct exec_params *epp)
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{
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struct elf_phdr *ph;
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int error, i, phsize;
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const char elfident[] = {ELFMAG0, ELFMAG1, ELFMAG2, ELFMAG3,
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ELFCLASS32, ELFDATA2LSB, EV_CURRENT, ELFOSABI_SYSV, 0};
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/*
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* Check that this is an ELF file that we can handle,
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* and do some sanity checks on the header
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*/
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if (epp->hdr_len < sizeof(struct elf_ehdr))
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return ENOEXEC;
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for (i = 0; i < sizeof elfident; i++)
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if (epp->hdr.elf.e_ident[i] != elfident[i])
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return ENOEXEC;
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if (epp->hdr.elf.e_type != ET_EXEC)
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return ENOEXEC;
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if (epp->hdr.elf.e_machine != EM_MIPS || epp->hdr.elf.e_version != EV_CURRENT)
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return ENOEXEC;
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if (epp->hdr.elf.e_phentsize != sizeof(struct elf_phdr) || epp->hdr.elf.e_phoff == 0 || epp->hdr.elf.e_phnum == 0)
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return ENOEXEC;
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if (epp->hdr.elf.e_shnum == 0 || epp->hdr.elf.e_shentsize != sizeof(struct elf_shdr))
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return ENOEXEC;
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/*
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* Read program headers
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*/
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phsize = epp->hdr.elf.e_phnum * sizeof(struct elf_phdr);
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ph = exec_alloc(phsize, NBPW, epp);
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if (ph == NULL) {
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printf("can't alloc ph[] sz=%d\n", phsize);
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return ENOEXEC;
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}
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if ((error = rdwri(UIO_READ, epp->ip, (caddr_t)ph, phsize, epp->hdr.elf.e_phoff, IO_UNIT, 0)) != 0)
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return ENOEXEC;
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epp->text.len = epp->data.len = epp->bss.len = epp->stack.len = epp->heap.len = 0;
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epp->text.vaddr = epp->data.vaddr = epp->bss.vaddr = epp->stack.vaddr = epp->heap.vaddr = NO_ADDR;
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if (epp->hdr.elf.e_phnum == 1 && ph[0].p_type == PT_LOAD && ph[0].p_flags == (PF_R|PF_W|PF_X)) {
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/*
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* In the simple a.out type link, in elf format, there is only
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* one loadable segment that is RWE containing everything
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* Here we fix the memory allocation, and we are done.
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*/
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epp->data.vaddr = (caddr_t)ph[0].p_vaddr;
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epp->data.len = ph[0].p_memsz;
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epp->heap.vaddr = (caddr_t)ph[0].p_vaddr + ph[0].p_memsz;
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epp->heap.len = 0;
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epp->stack.len = SSIZE + epp->argbc + epp->envbc + (epp->argc+epp->envc+4)*NBPW;
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epp->stack.vaddr = (caddr_t)USER_DATA_END - epp->stack.len;
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/*
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* We assume .bss is the different between the memory data
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* section size and the file size.
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*/
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epp->bss.vaddr = epp->data.vaddr + ph[0].p_filesz;
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epp->bss.len = ph[0].p_memsz - ph[0].p_filesz;
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epp->data.len = epp->bss.vaddr - epp->data.vaddr;
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} else {
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/*
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* At the current moment we don't handle anything else
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* The rest of the code is implemented as need arise.
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*/
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return ENOEXEC;
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}
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/*
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* Save arglist
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*/
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exec_save_args(epp);
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/*
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* Establish memory
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*/
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if ((error = exec_estab(epp)) != 0)
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return error;
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/*
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* Now load the program sections into memory
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*/
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for (i = 0; i < epp->hdr.elf.e_phnum; i++) {
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if (ph[i].p_type != PT_LOAD)
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continue;
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/*
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* Sanity check that the load is to our intended address space.
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*/
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if (!((epp->text.vaddr != NO_ADDR
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&& ((caddr_t)ph[i].p_vaddr >= epp->text.vaddr
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&& (caddr_t)ph[i].p_vaddr + ph[i].p_filesz <= epp->text.vaddr + epp->text.len))
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|| (epp->data.vaddr != NO_ADDR
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&& (caddr_t)ph[i].p_vaddr >= epp->data.vaddr
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&& (caddr_t)ph[i].p_vaddr + ph[i].p_filesz <= epp->data.vaddr + epp->data.len))
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|| ph[i].p_filesz >= ph[i].p_memsz || ph[i].p_filesz <= 0)
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return ENOEXEC;
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error = rdwri(UIO_READ, epp->ip, (caddr_t)ph[i].p_vaddr, ph[i].p_filesz, ph[i].p_offset, IO_UNIT, 0);
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}
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exec_clear(epp);
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exec_setupstack(epp->hdr.elf.e_entry, epp);
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return 0;
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}
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