/* $NetBSD: kobj_machdep.c,v 1.8 2023/04/28 07:33:56 skrll Exp $ */ /*- * Copyright (c) 2008 The NetBSD Foundation, Inc. * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``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 FOUNDATION OR CONTRIBUTORS * 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. */ /*- * Copyright 1996-1998 John D. Polstra. * 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> __KERNEL_RCSID(0, "$NetBSD: kobj_machdep.c,v 1.8 2023/04/28 07:33:56 skrll Exp $"); #define ELFSIZE ARCH_ELFSIZE #include <sys/param.h> #include <sys/systm.h> #include <sys/kobj.h> #include <sys/exec.h> #include <sys/exec_elf.h> int kobj_reloc(kobj_t ko, uintptr_t relocbase, const void *data, bool isrela, bool local) { #ifdef _LP64 Elf64_Half *wwhere; #endif Elf_Addr *where; Elf32_Half *hwhere; Elf_Addr addr; Elf_Sword addend; /* needs to be signed */ u_int rtype, symidx; const Elf_Rela *rela; int error; if (!isrela) { panic("kobj_reloc: REL relocations not supported"); } rela = (const Elf_Rela *)data; where = (Elf_Addr *) (relocbase + rela->r_offset); hwhere = (Elf32_Half *) (relocbase + rela->r_offset); #ifdef _LP64 wwhere = (Elf64_Half *) (relocbase + rela->r_offset); #endif addend = rela->r_addend; rtype = ELF_R_TYPE(rela->r_info); symidx = ELF_R_SYM(rela->r_info); const Elf_Sym *sym = kobj_symbol(ko, symidx); if (!local && ELF_ST_BIND(sym->st_info) == STB_LOCAL) { return 0; } switch (rtype) { case R_PPC_NONE: break; case R_PPC_RELATIVE: /* word32 B + A */ addend += relocbase; /* A += B */ break; case R_PPC_REL32: /* word32 S + A - P */ case R_PPC_REL16: /* half16* (S + A - P) */ case R_PPC_REL16_LO: /* half16 #lo(S + A - P) */ case R_PPC_REL16_HI: /* half16 #hi(S + A - P) */ case R_PPC_REL16_HA: /* half16 #ha(S + A - P) */ addend -= relocbase + rela->r_offset; /* A -= P */ /* FALLTHROUGH */ #ifdef _LP64 case R_PPC_ADDR64: /* doubleword64 S + A */ #endif case R_PPC_ADDR32: /* word32 S + A */ case R_PPC_ADDR16: /* half16* S + A */ case R_PPC_ADDR16_LO: /* half16 #lo(S + A) */ case R_PPC_ADDR16_HA: /* half16 #ha(S + A) */ case R_PPC_ADDR16_HI: /* half16 #hi(S + A) */ error = kobj_sym_lookup(ko, symidx, &addr); if (error) return -1; #if 0 /* * addend values are sometimes relative to sections * (i.e. .rodata) in rela, where in reality they * are relative to relocbase. Detect this condition. */ if (addr > relocbase && addr <= (relocbase + addend)) addr = relocbase + addend; else #endif addend += addr; /* A += S */ break; default: printf("kobj_reloc: unexpected relocation type %u\n", rtype); return -1; } switch (rtype) { case R_PPC_REL32: /* word32 S + A - P */ #ifdef _LP64 *wwhere = addend; break; #endif case R_PPC_RELATIVE: /* doubleword64/word32 B + A */ case R_PPC_ADDR32: /* doubleword64/word32 S + A */ *where = addend; break; case R_PPC_REL16: /* half16* (S + A - P) */ case R_PPC_ADDR16: /* half16* S + A */ if ((int16_t) addend != addend) return -1; /* FALLTHROUGH */ case R_PPC_REL16_LO: /* half16 #lo(S + A - P) */ case R_PPC_ADDR16_LO: /* half16 #lo(S + A) */ *hwhere = addend & 0xffff; break; case R_PPC_REL16_HA: /* half16 #ha(S + A - P) */ case R_PPC_ADDR16_HA: /* half16 #ha(S + A) */ addend += 0x8000; /* FALLTHROUGH */ case R_PPC_REL16_HI: /* half16 #hi(S + A - P) */ case R_PPC_ADDR16_HI: /* half16 #hi(S + A) */ *hwhere = (addend >> 16) & 0xffff; break; } return 0; } int kobj_machdep(kobj_t ko, void *base, size_t size, bool load) { if (load) __syncicache(base, size); return 0; }
