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/altivec.h>
   51 #include <machine/cpu.h>
   52 #include <machine/elf.h>
   53 #include <machine/reg.h>
   54 #include <machine/md_var.h>
   55 
   56 #ifdef __powerpc64__
   57 #include <compat/freebsd32/freebsd32_proto.h>
   58 #include <compat/freebsd32/freebsd32_util.h>
   59 
   60 extern const char *freebsd32_syscallnames[];
   61 #endif
   62 
   63 struct sysentvec elf32_freebsd_sysvec = {
   64         .sv_size        = SYS_MAXSYSCALL,
   65 #ifdef __powerpc64__
   66         .sv_table       = freebsd32_sysent,
   67 #else
   68         .sv_table       = sysent,
   69 #endif
   70         .sv_mask        = 0,
   71         .sv_errsize     = 0,
   72         .sv_errtbl      = NULL,
   73         .sv_transtrap   = NULL,
   74         .sv_fixup       = __elfN(freebsd_fixup),
   75         .sv_sendsig     = sendsig,
   76         .sv_sigcode     = sigcode32,
   77         .sv_szsigcode   = &szsigcode32,
   78         .sv_name        = "FreeBSD ELF32",
   79         .sv_coredump    = __elfN(coredump),
   80         .sv_imgact_try  = NULL,
   81         .sv_minsigstksz = MINSIGSTKSZ,
   82         .sv_pagesize    = PAGE_SIZE,
   83         .sv_minuser     = VM_MIN_ADDRESS,
   84         .sv_stackprot   = VM_PROT_ALL,
   85 #ifdef __powerpc64__
   86         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   87         .sv_usrstack    = FREEBSD32_USRSTACK,
   88         .sv_psstrings   = FREEBSD32_PS_STRINGS,
   89         .sv_copyout_strings = freebsd32_copyout_strings,
   90         .sv_setregs     = ppc32_setregs,
   91         .sv_syscallnames = freebsd32_syscallnames,
   92 #else
   93         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   94         .sv_usrstack    = USRSTACK,
   95         .sv_psstrings   = PS_STRINGS,
   96         .sv_copyout_strings = exec_copyout_strings,
   97         .sv_setregs     = exec_setregs,
   98         .sv_syscallnames = syscallnames,
   99 #endif
  100         .sv_fixlimit    = NULL,
  101         .sv_maxssiz     = NULL,
  102         .sv_flags       = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP,
  103         .sv_set_syscall_retval = cpu_set_syscall_retval,
  104         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
  105         .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
  106         .sv_shared_page_len = PAGE_SIZE,
  107         .sv_schedtail   = NULL,
  108         .sv_thread_detach = NULL,
  109         .sv_trap        = NULL,
  110 };
  111 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
  112 
  113 static Elf32_Brandinfo freebsd_brand_info = {
  114         .brand          = ELFOSABI_FREEBSD,
  115         .machine        = EM_PPC,
  116         .compat_3_brand = "FreeBSD",
  117         .emul_path      = NULL,
  118         .interp_path    = "/libexec/ld-elf.so.1",
  119         .sysvec         = &elf32_freebsd_sysvec,
  120 #ifdef __powerpc64__
  121         .interp_newpath = "/libexec/ld-elf32.so.1",
  122 #else
  123         .interp_newpath = NULL,
  124 #endif
  125         .brand_note     = &elf32_freebsd_brandnote,
  126         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  127 };
  128 
  129 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
  130     (sysinit_cfunc_t) elf32_insert_brand_entry,
  131     &freebsd_brand_info);
  132 
  133 static Elf32_Brandinfo freebsd_brand_oinfo = {
  134         .brand          = ELFOSABI_FREEBSD,
  135         .machine        = EM_PPC,
  136         .compat_3_brand = "FreeBSD",
  137         .emul_path      = NULL,
  138         .interp_path    = "/usr/libexec/ld-elf.so.1",
  139         .sysvec         = &elf32_freebsd_sysvec,
  140         .interp_newpath = NULL,
  141         .brand_note     = &elf32_freebsd_brandnote,
  142         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  143 };
  144 
  145 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  146         (sysinit_cfunc_t) elf32_insert_brand_entry,
  147         &freebsd_brand_oinfo);
  148 
  149 void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase);
  150 
  151 void
  152 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
  153 {
  154         size_t len;
  155         struct pcb *pcb;
  156 
  157         len = 0;
  158         pcb = td->td_pcb;
  159         if (pcb->pcb_flags & PCB_VEC) {
  160                 save_vec_nodrop(td);
  161                 if (dst != NULL) {
  162                         len += elf32_populate_note(NT_PPC_VMX,
  163                             &pcb->pcb_vec, dst,
  164                             sizeof(pcb->pcb_vec), NULL);
  165                 } else
  166                         len += elf32_populate_note(NT_PPC_VMX, NULL, NULL,
  167                             sizeof(pcb->pcb_vec), NULL);
  168         }
  169         *off = len;
  170 }
  171 
  172 #ifndef __powerpc64__
  173 bool
  174 elf_is_ifunc_reloc(Elf_Size r_info __unused)
  175 {
  176 
  177         return (false);
  178 }
  179 
  180 /* Process one elf relocation with addend. */
  181 static int
  182 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  183     int type, int local, elf_lookup_fn lookup)
  184 {
  185         Elf_Addr *where;
  186         Elf_Half *hwhere;
  187         Elf_Addr addr;
  188         Elf_Addr addend;
  189         Elf_Word rtype, symidx;
  190         const Elf_Rela *rela;
  191         int error;
  192 
  193         switch (type) {
  194         case ELF_RELOC_REL:
  195                 panic("PPC only supports RELA relocations");
  196                 break;
  197         case ELF_RELOC_RELA:
  198                 rela = (const Elf_Rela *)data;
  199                 where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset);
  200                 hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset);
  201                 addend = rela->r_addend;
  202                 rtype = ELF_R_TYPE(rela->r_info);
  203                 symidx = ELF_R_SYM(rela->r_info);
  204                 break;
  205         default:
  206                 panic("elf_reloc: unknown relocation mode %d\n", type);
  207         }
  208 
  209         switch (rtype) {
  210 
  211         case R_PPC_NONE:
  212                 break;
  213 
  214         case R_PPC_ADDR32: /* word32 S + A */
  215                 error = lookup(lf, symidx, 1, &addr);
  216                 if (error != 0)
  217                         return -1;
  218                 *where = elf_relocaddr(lf, addr + addend);
  219                         break;
  220 
  221         case R_PPC_ADDR16_LO: /* #lo(S) */
  222                 error = lookup(lf, symidx, 1, &addr);
  223                 if (error != 0)
  224                         return -1;
  225                 /*
  226                  * addend values are sometimes relative to sections
  227                  * (i.e. .rodata) in rela, where in reality they
  228                  * are relative to relocbase. Detect this condition.
  229                  */
  230                 if (addr > relocbase && addr <= (relocbase + addend))
  231                         addr = relocbase;
  232                 addr = elf_relocaddr(lf, addr + addend);
  233                 *hwhere = addr & 0xffff;
  234                 break;
  235 
  236         case R_PPC_ADDR16_HA: /* #ha(S) */
  237                 error = lookup(lf, symidx, 1, &addr);
  238                 if (error != 0)
  239                         return -1;
  240                 /*
  241                  * addend values are sometimes relative to sections
  242                  * (i.e. .rodata) in rela, where in reality they
  243                  * are relative to relocbase. Detect this condition.
  244                  */
  245                 if (addr > relocbase && addr <= (relocbase + addend))
  246                         addr = relocbase;
  247                 addr = elf_relocaddr(lf, addr + addend);
  248                 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
  249                     & 0xffff;
  250                 break;
  251 
  252         case R_PPC_RELATIVE: /* word32 B + A */
  253                 *where = elf_relocaddr(lf, relocbase + addend);
  254                 break;
  255 
  256         default:
  257                 printf("kldload: unexpected relocation type %d\n",
  258                     (int) rtype);
  259                 return -1;
  260         }
  261         return(0);
  262 }
  263 
  264 void
  265 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase)
  266 {
  267         Elf_Rela *rela = NULL, *relalim;
  268         Elf_Addr relasz = 0;
  269         Elf_Addr *where;
  270 
  271         /*
  272          * Extract the rela/relasz values from the dynamic section
  273          */
  274         for (; dynp->d_tag != DT_NULL; dynp++) {
  275                 switch (dynp->d_tag) {
  276                 case DT_RELA:
  277                         rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr);
  278                         break;
  279                 case DT_RELASZ:
  280                         relasz = dynp->d_un.d_val;
  281                         break;
  282                 }
  283         }
  284 
  285         /*
  286          * Relocate these values
  287          */
  288         relalim = (Elf_Rela *)((caddr_t)rela + relasz);
  289         for (; rela < relalim; rela++) {
  290                 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE)
  291                         continue;
  292                 where = (Elf_Addr *)(relocbase + rela->r_offset);
  293                 *where = (Elf_Addr)(relocbase + rela->r_addend);
  294         }
  295 }
  296 
  297 int
  298 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  299     elf_lookup_fn lookup)
  300 {
  301 
  302         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  303 }
  304 
  305 int
  306 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  307     int type, elf_lookup_fn lookup)
  308 {
  309 
  310         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  311 }
  312 
  313 int
  314 elf_cpu_load_file(linker_file_t lf)
  315 {
  316         /* Only sync the cache for non-kernel modules */
  317         if (lf->id != 1)
  318                 __syncicache(lf->address, lf->size);
  319         return (0);
  320 }
  321 
  322 int
  323 elf_cpu_unload_file(linker_file_t lf __unused)
  324 {
  325 
  326         return (0);
  327 }
  328 #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
