elf32_machdep.c

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    1 /*-
    2  * Copyright 1996-1998 John D. Polstra.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  *
   25  * $FreeBSD$
   26  */
   27 
   28 #include <sys/param.h>
   29 #include <sys/kernel.h>
   30 #include <sys/systm.h>
   31 
   32 #define __ELF_WORD_SIZE 32
   33 
   34 #include <sys/exec.h>
   35 #include <sys/imgact.h>
   36 #include <sys/malloc.h>
   37 #include <sys/proc.h>
   38 #include <sys/namei.h>
   39 #include <sys/fcntl.h>
   40 #include <sys/sysent.h>
   41 #include <sys/imgact_elf.h>
   42 #include <sys/syscall.h>
   43 #include <sys/signalvar.h>
   44 #include <sys/vnode.h>
   45 #include <sys/linker.h>
   46 
   47 #include <vm/vm.h>
   48 #include <vm/vm_param.h>
   49 
   50 #include <machine/cpu.h>
   51 #include <machine/elf.h>
   52 #include <machine/reg.h>
   53 #include <machine/md_var.h>
   54 
   55 #ifdef __powerpc64__
   56 #include <compat/freebsd32/freebsd32_proto.h>
   57 #include <compat/freebsd32/freebsd32_util.h>
   58 
   59 extern const char *freebsd32_syscallnames[];
   60 #endif
   61 
   62 struct sysentvec elf32_freebsd_sysvec = {
   63         .sv_size        = SYS_MAXSYSCALL,
   64 #ifdef __powerpc64__
   65         .sv_table       = freebsd32_sysent,
   66 #else
   67         .sv_table       = sysent,
   68 #endif
   69         .sv_mask        = 0,
   70         .sv_sigsize     = 0,
   71         .sv_sigtbl      = NULL,
   72         .sv_errsize     = 0,
   73         .sv_errtbl      = NULL,
   74         .sv_transtrap   = NULL,
   75         .sv_fixup       = __elfN(freebsd_fixup),
   76         .sv_sendsig     = sendsig,
   77         .sv_sigcode     = sigcode32,
   78         .sv_szsigcode   = &szsigcode32,
   79         .sv_prepsyscall = NULL,
   80         .sv_name        = "FreeBSD ELF32",
   81         .sv_coredump    = __elfN(coredump),
   82         .sv_imgact_try  = NULL,
   83         .sv_minsigstksz = MINSIGSTKSZ,
   84         .sv_pagesize    = PAGE_SIZE,
   85         .sv_minuser     = VM_MIN_ADDRESS,
   86         .sv_stackprot   = VM_PROT_ALL,
   87 #ifdef __powerpc64__
   88         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   89         .sv_usrstack    = FREEBSD32_USRSTACK,
   90         .sv_psstrings   = FREEBSD32_PS_STRINGS,
   91         .sv_copyout_strings = freebsd32_copyout_strings,
   92         .sv_setregs     = ppc32_setregs,
   93         .sv_syscallnames = freebsd32_syscallnames,
   94 #else
   95         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   96         .sv_usrstack    = USRSTACK,
   97         .sv_psstrings   = PS_STRINGS,
   98         .sv_copyout_strings = exec_copyout_strings,
   99         .sv_setregs     = exec_setregs,
  100         .sv_syscallnames = syscallnames,
  101 #endif
  102         .sv_fixlimit    = NULL,
  103         .sv_maxssiz     = NULL,
  104         .sv_flags       = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP,
  105         .sv_set_syscall_retval = cpu_set_syscall_retval,
  106         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
  107         .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
  108         .sv_shared_page_len = PAGE_SIZE,
  109         .sv_schedtail   = NULL,
  110         .sv_thread_detach = NULL,
  111         .sv_trap        = NULL,
  112 };
  113 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
  114 
  115 static Elf32_Brandinfo freebsd_brand_info = {
  116         .brand          = ELFOSABI_FREEBSD,
  117         .machine        = EM_PPC,
  118         .compat_3_brand = "FreeBSD",
  119         .emul_path      = NULL,
  120         .interp_path    = "/libexec/ld-elf.so.1",
  121         .sysvec         = &elf32_freebsd_sysvec,
  122 #ifdef __powerpc64__
  123         .interp_newpath = "/libexec/ld-elf32.so.1",
  124 #else
  125         .interp_newpath = NULL,
  126 #endif
  127         .brand_note     = &elf32_freebsd_brandnote,
  128         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  129 };
  130 
  131 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
  132     (sysinit_cfunc_t) elf32_insert_brand_entry,
  133     &freebsd_brand_info);
  134 
  135 static Elf32_Brandinfo freebsd_brand_oinfo = {
  136         .brand          = ELFOSABI_FREEBSD,
  137         .machine        = EM_PPC,
  138         .compat_3_brand = "FreeBSD",
  139         .emul_path      = NULL,
  140         .interp_path    = "/usr/libexec/ld-elf.so.1",
  141         .sysvec         = &elf32_freebsd_sysvec,
  142         .interp_newpath = NULL,
  143         .brand_note     = &elf32_freebsd_brandnote,
  144         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  145 };
  146 
  147 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  148         (sysinit_cfunc_t) elf32_insert_brand_entry,
  149         &freebsd_brand_oinfo);
  150 
  151 void
  152 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  153     size_t *off __unused)
  154 {
  155 }
  156 
  157 #ifndef __powerpc64__
  158 /* Process one elf relocation with addend. */
  159 static int
  160 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  161     int type, int local, elf_lookup_fn lookup)
  162 {
  163         Elf_Addr *where;
  164         Elf_Half *hwhere;
  165         Elf_Addr addr;
  166         Elf_Addr addend;
  167         Elf_Word rtype, symidx;
  168         const Elf_Rela *rela;
  169         int error;
  170 
  171         switch (type) {
  172         case ELF_RELOC_REL:
  173                 panic("PPC only supports RELA relocations");
  174                 break;
  175         case ELF_RELOC_RELA:
  176                 rela = (const Elf_Rela *)data;
  177                 where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset);
  178                 hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset);
  179                 addend = rela->r_addend;
  180                 rtype = ELF_R_TYPE(rela->r_info);
  181                 symidx = ELF_R_SYM(rela->r_info);
  182                 break;
  183         default:
  184                 panic("elf_reloc: unknown relocation mode %d\n", type);
  185         }
  186 
  187         switch (rtype) {
  188 
  189         case R_PPC_NONE:
  190                 break;
  191 
  192         case R_PPC_ADDR32: /* word32 S + A */
  193                 error = lookup(lf, symidx, 1, &addr);
  194                 if (error != 0)
  195                         return -1;
  196                 addr += addend;
  197                 *where = addr;
  198                         break;
  199 
  200         case R_PPC_ADDR16_LO: /* #lo(S) */
  201                 error = lookup(lf, symidx, 1, &addr);
  202                 if (error != 0)
  203                         return -1;
  204                 /*
  205                  * addend values are sometimes relative to sections
  206                  * (i.e. .rodata) in rela, where in reality they
  207                  * are relative to relocbase. Detect this condition.
  208                  */
  209                 if (addr > relocbase && addr <= (relocbase + addend))
  210                         addr = relocbase + addend;
  211                 else
  212                         addr += addend;
  213                 *hwhere = addr & 0xffff;
  214                 break;
  215 
  216         case R_PPC_ADDR16_HA: /* #ha(S) */
  217                 error = lookup(lf, symidx, 1, &addr);
  218                 if (error != 0)
  219                         return -1;
  220                 /*
  221                  * addend values are sometimes relative to sections
  222                  * (i.e. .rodata) in rela, where in reality they
  223                  * are relative to relocbase. Detect this condition.
  224                  */
  225                 if (addr > relocbase && addr <= (relocbase + addend))
  226                         addr = relocbase + addend;
  227                 else
  228                         addr += addend;
  229                 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
  230                     & 0xffff;
  231                 break;
  232 
  233         case R_PPC_RELATIVE: /* word32 B + A */
  234                 *where = elf_relocaddr(lf, relocbase + addend);
  235                 break;
  236 
  237         default:
  238                 printf("kldload: unexpected relocation type %d\n",
  239                     (int) rtype);
  240                 return -1;
  241         }
  242         return(0);
  243 }
  244 
  245 int
  246 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  247     elf_lookup_fn lookup)
  248 {
  249 
  250         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  251 }
  252 
  253 int
  254 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  255     int type, elf_lookup_fn lookup)
  256 {
  257 
  258         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  259 }
  260 
  261 int
  262 elf_cpu_load_file(linker_file_t lf)
  263 {
  264         /* Only sync the cache for non-kernel modules */
  265         if (lf->id != 1)
  266                 __syncicache(lf->address, lf->size);
  267         return (0);
  268 }
  269 
  270 int
  271 elf_cpu_unload_file(linker_file_t lf __unused)
  272 {
  273 
  274         return (0);
  275 }
  276 #endif

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powerpc/elf32_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/elf32_machdep.c