freebsd-skq/sys/mips/mips/elf_trampoline.c
delphij fa1c6f9a29 Delete unneeded #include <sys/inflate.h> from sys/mips.
PR:		229763
Submitted by:	Yoshihiro Ota <ota at j.email.ne.jp>
Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D20190
2019-05-23 05:17:18 +00:00

226 lines
5.7 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2005 Olivier Houchard. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <machine/asm.h>
#include <sys/param.h>
#if ELFSIZE == 64
#include <sys/elf64.h>
#else
#include <sys/elf32.h>
#endif
/*
* Since we are compiled outside of the normal kernel build process, we
* need to include opt_global.h manually.
*/
#include "opt_global.h"
#include <machine/elf.h>
#include <machine/cpufunc.h>
#include <machine/stdarg.h>
#ifndef KERNNAME
#error Kernel name not provided
#endif
extern char kernel_start[];
extern char kernel_end[];
static __inline void *
memcpy(void *dst, const void *src, size_t len)
{
const char *s = src;
char *d = dst;
while (len) {
if (0 && len >= 4 && !((vm_offset_t)d & 3) &&
!((vm_offset_t)s & 3)) {
*(uint32_t *)d = *(uint32_t *)s;
s += 4;
d += 4;
len -= 4;
} else {
*d++ = *s++;
len--;
}
}
return (dst);
}
static __inline void
bzero(void *addr, size_t count)
{
char *tmp = (char *)addr;
while (count > 0) {
if (count >= 4 && !((vm_offset_t)tmp & 3)) {
*(uint32_t *)tmp = 0;
tmp += 4;
count -= 4;
} else {
*tmp = 0;
tmp++;
count--;
}
}
}
/*
* Convert number to pointer, truncate on 64->32 case, sign extend
* in 32->64 case
*/
#define mkptr(x) ((void *)(intptr_t)(int)(x))
/*
* Relocate PT_LOAD segements of kernel ELF image to their respective
* virtual addresses and return entry point
*/
void *
load_kernel(void * kstart)
{
#if ELFSIZE == 64
Elf64_Ehdr *eh;
Elf64_Phdr phdr[64] /* XXX */;
Elf64_Shdr shdr[64] /* XXX */;
#else
Elf32_Ehdr *eh;
Elf32_Phdr phdr[64] /* XXX */;
Elf32_Shdr shdr[64] /* XXX */;
#endif
int i, j;
void *entry_point;
vm_offset_t loadend = 0;
intptr_t lastaddr;
int symtabindex = -1;
int symstrindex = -1;
Elf_Size tmp;
#if ELFSIZE == 64
eh = (Elf64_Ehdr *)kstart;
#else
eh = (Elf32_Ehdr *)kstart;
#endif
entry_point = mkptr(eh->e_entry);
memcpy(phdr, (void *)(kstart + eh->e_phoff),
eh->e_phnum * sizeof(phdr[0]));
memcpy(shdr, (void *)(kstart + eh->e_shoff),
sizeof(*shdr) * eh->e_shnum);
if (eh->e_shnum * eh->e_shentsize != 0 && eh->e_shoff != 0) {
for (i = 0; i < eh->e_shnum; i++) {
if (shdr[i].sh_type == SHT_SYMTAB) {
/*
* XXX: check if .symtab is in PT_LOAD?
*/
if (shdr[i].sh_offset != 0 &&
shdr[i].sh_size != 0) {
symtabindex = i;
symstrindex = shdr[i].sh_link;
}
}
}
}
/*
* Copy loadable segments
*/
for (i = 0; i < eh->e_phnum; i++) {
volatile char c;
if (phdr[i].p_type != PT_LOAD)
continue;
memcpy(mkptr(phdr[i].p_vaddr),
(void*)(kstart + phdr[i].p_offset), phdr[i].p_filesz);
/* Clean space from oversized segments, eg: bss. */
if (phdr[i].p_filesz < phdr[i].p_memsz)
bzero(mkptr(phdr[i].p_vaddr + phdr[i].p_filesz),
phdr[i].p_memsz - phdr[i].p_filesz);
if (loadend < phdr[i].p_vaddr + phdr[i].p_memsz)
loadend = phdr[i].p_vaddr + phdr[i].p_memsz;
}
/* Now grab the symbol tables. */
lastaddr = (intptr_t)(int)loadend;
if (symtabindex >= 0 && symstrindex >= 0) {
tmp = SYMTAB_MAGIC;
memcpy((void *)lastaddr, &tmp, sizeof(tmp));
lastaddr += sizeof(Elf_Size);
tmp = shdr[symtabindex].sh_size +
shdr[symstrindex].sh_size + 2*sizeof(Elf_Size);
memcpy((void *)lastaddr, &tmp, sizeof(tmp));
lastaddr += sizeof(Elf_Size);
/* .symtab size */
tmp = shdr[symtabindex].sh_size;
memcpy((void *)lastaddr, &tmp, sizeof(tmp));
lastaddr += sizeof(shdr[symtabindex].sh_size);
/* .symtab data */
memcpy((void*)lastaddr,
shdr[symtabindex].sh_offset + kstart,
shdr[symtabindex].sh_size);
lastaddr += shdr[symtabindex].sh_size;
/* .strtab size */
tmp = shdr[symstrindex].sh_size;
memcpy((void *)lastaddr, &tmp, sizeof(tmp));
lastaddr += sizeof(shdr[symstrindex].sh_size);
/* .strtab data */
memcpy((void*)lastaddr,
shdr[symstrindex].sh_offset + kstart,
shdr[symstrindex].sh_size);
} else {
/* Do not take any chances */
tmp = 0;
memcpy((void *)lastaddr, &tmp, sizeof(tmp));
}
return entry_point;
}
void
_startC(register_t a0, register_t a1, register_t a2, register_t a3)
{
unsigned int * code;
int i;
void (*entry_point)(register_t, register_t, register_t, register_t);
/*
* Relocate segment to the predefined memory location
* Most likely it will be KSEG0/KSEG1 address
*/
entry_point = load_kernel(kernel_start);
/* Pass saved registers to original _start */
entry_point(a0, a1, a2, a3);
}