elf32_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright 1996-1998 John D. Polstra.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  *
   27  * $FreeBSD$
   28  */
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/systm.h>
   33 
   34 #define __ELF_WORD_SIZE 32
   35 
   36 #include <sys/exec.h>
   37 #include <sys/imgact.h>
   38 #include <sys/malloc.h>
   39 #include <sys/proc.h>
   40 #include <sys/namei.h>
   41 #include <sys/fcntl.h>
   42 #include <sys/sysent.h>
   43 #include <sys/imgact_elf.h>
   44 #include <sys/syscall.h>
   45 #include <sys/sysctl.h>
   46 #include <sys/signalvar.h>
   47 #include <sys/vnode.h>
   48 #include <sys/linker.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/vm_param.h>
   52 
   53 #include <machine/altivec.h>
   54 #include <machine/cpu.h>
   55 #include <machine/fpu.h>
   56 #include <machine/elf.h>
   57 #include <machine/reg.h>
   58 #include <machine/md_var.h>
   59 
   60 #ifdef __powerpc64__
   61 #include <compat/freebsd32/freebsd32_proto.h>
   62 #include <compat/freebsd32/freebsd32_util.h>
   63 
   64 extern const char *freebsd32_syscallnames[];
   65 static void ppc32_fixlimit(struct rlimit *rl, int which);
   66 
   67 static SYSCTL_NODE(_compat, OID_AUTO, ppc32, CTLFLAG_RW, 0, "32-bit mode");
   68 
   69 #define PPC32_MAXDSIZ (1024*1024*1024)
   70 static u_long ppc32_maxdsiz = PPC32_MAXDSIZ;
   71 SYSCTL_ULONG(_compat_ppc32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ppc32_maxdsiz,
   72              0, "");
   73 #define PPC32_MAXSSIZ (64*1024*1024)
   74 u_long ppc32_maxssiz = PPC32_MAXSSIZ;
   75 SYSCTL_ULONG(_compat_ppc32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ppc32_maxssiz,
   76              0, "");
   77 #endif
   78 
   79 struct sysentvec elf32_freebsd_sysvec = {
   80         .sv_size        = SYS_MAXSYSCALL,
   81 #ifdef __powerpc64__
   82         .sv_table       = freebsd32_sysent,
   83 #else
   84         .sv_table       = sysent,
   85 #endif
   86         .sv_mask        = 0,
   87         .sv_errsize     = 0,
   88         .sv_errtbl      = NULL,
   89         .sv_transtrap   = NULL,
   90         .sv_fixup       = __elfN(freebsd_fixup),
   91         .sv_sendsig     = sendsig,
   92         .sv_sigcode     = sigcode32,
   93         .sv_szsigcode   = &szsigcode32,
   94         .sv_name        = "FreeBSD ELF32",
   95         .sv_coredump    = __elfN(coredump),
   96         .sv_imgact_try  = NULL,
   97         .sv_minsigstksz = MINSIGSTKSZ,
   98         .sv_minuser     = VM_MIN_ADDRESS,
   99         .sv_stackprot   = VM_PROT_ALL,
  100 #ifdef __powerpc64__
  101         .sv_maxuser     = VM_MAXUSER_ADDRESS32,
  102         .sv_usrstack    = FREEBSD32_USRSTACK,
  103         .sv_psstrings   = FREEBSD32_PS_STRINGS,
  104         .sv_copyout_strings = freebsd32_copyout_strings,
  105         .sv_setregs     = ppc32_setregs,
  106         .sv_syscallnames = freebsd32_syscallnames,
  107         .sv_fixlimit    = ppc32_fixlimit,
  108 #else
  109         .sv_maxuser     = VM_MAXUSER_ADDRESS,
  110         .sv_usrstack    = USRSTACK,
  111         .sv_psstrings   = PS_STRINGS,
  112         .sv_copyout_strings = exec_copyout_strings,
  113         .sv_setregs     = exec_setregs,
  114         .sv_syscallnames = syscallnames,
  115         .sv_fixlimit    = NULL,
  116 #endif
  117         .sv_maxssiz     = NULL,
  118         .sv_flags       = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP | SV_ASLR,
  119         .sv_set_syscall_retval = cpu_set_syscall_retval,
  120         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
  121         .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
  122         .sv_shared_page_len = PAGE_SIZE,
  123         .sv_schedtail   = NULL,
  124         .sv_thread_detach = NULL,
  125         .sv_trap        = NULL,
  126         .sv_hwcap       = &cpu_features,
  127         .sv_hwcap2      = &cpu_features2,
  128 };
  129 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
  130 
  131 static Elf32_Brandinfo freebsd_brand_info = {
  132         .brand          = ELFOSABI_FREEBSD,
  133         .machine        = EM_PPC,
  134         .compat_3_brand = "FreeBSD",
  135         .emul_path      = NULL,
  136         .interp_path    = "/libexec/ld-elf.so.1",
  137         .sysvec         = &elf32_freebsd_sysvec,
  138 #ifdef __powerpc64__
  139         .interp_newpath = "/libexec/ld-elf32.so.1",
  140 #else
  141         .interp_newpath = NULL,
  142 #endif
  143         .brand_note     = &elf32_freebsd_brandnote,
  144         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  145 };
  146 
  147 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
  148     (sysinit_cfunc_t) elf32_insert_brand_entry,
  149     &freebsd_brand_info);
  150 
  151 static Elf32_Brandinfo freebsd_brand_oinfo = {
  152         .brand          = ELFOSABI_FREEBSD,
  153         .machine        = EM_PPC,
  154         .compat_3_brand = "FreeBSD",
  155         .emul_path      = NULL,
  156         .interp_path    = "/usr/libexec/ld-elf.so.1",
  157         .sysvec         = &elf32_freebsd_sysvec,
  158         .interp_newpath = NULL,
  159         .brand_note     = &elf32_freebsd_brandnote,
  160         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  161 };
  162 
  163 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  164         (sysinit_cfunc_t) elf32_insert_brand_entry,
  165         &freebsd_brand_oinfo);
  166 
  167 void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase);
  168 
  169 void
  170 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
  171 {
  172         size_t len;
  173         struct pcb *pcb;
  174         uint64_t vshr[32];
  175         uint64_t *vsr_dw1;
  176         int vsr_idx;
  177 
  178         len = 0;
  179         pcb = td->td_pcb;
  180 
  181         if (pcb->pcb_flags & PCB_VEC) {
  182                 save_vec_nodrop(td);
  183                 if (dst != NULL) {
  184                         len += elf32_populate_note(NT_PPC_VMX,
  185                             &pcb->pcb_vec, (char *)dst + len,
  186                             sizeof(pcb->pcb_vec), NULL);
  187                 } else
  188                         len += elf32_populate_note(NT_PPC_VMX, NULL, NULL,
  189                             sizeof(pcb->pcb_vec), NULL);
  190         }
  191 
  192         if (pcb->pcb_flags & PCB_VSX) {
  193                 save_fpu_nodrop(td);
  194                 if (dst != NULL) {
  195                         /*
  196                          * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and
  197                          * VSR32-VSR63 overlap with VR0-VR31, so we only copy
  198                          * the non-overlapping data, which is doubleword 1 of VSR0-VSR31.
  199                          */
  200                         for (vsr_idx = 0; vsr_idx < nitems(vshr); vsr_idx++) {
  201                                 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2];
  202                                 vshr[vsr_idx] = *vsr_dw1;
  203                         }
  204                         len += elf32_populate_note(NT_PPC_VSX,
  205                             vshr, (char *)dst + len,
  206                             sizeof(vshr), NULL);
  207                 } else
  208                         len += elf32_populate_note(NT_PPC_VSX, NULL, NULL,
  209                             sizeof(vshr), NULL);
  210         }
  211 
  212         *off = len;
  213 }
  214 
  215 #ifndef __powerpc64__
  216 bool
  217 elf_is_ifunc_reloc(Elf_Size r_info __unused)
  218 {
  219 
  220         return (false);
  221 }
  222 
  223 /* Process one elf relocation with addend. */
  224 static int
  225 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  226     int type, int local, elf_lookup_fn lookup)
  227 {
  228         Elf_Addr *where;
  229         Elf_Half *hwhere;
  230         Elf_Addr addr;
  231         Elf_Addr addend;
  232         Elf_Word rtype, symidx;
  233         const Elf_Rela *rela;
  234         int error;
  235 
  236         switch (type) {
  237         case ELF_RELOC_REL:
  238                 panic("PPC only supports RELA relocations");
  239                 break;
  240         case ELF_RELOC_RELA:
  241                 rela = (const Elf_Rela *)data;
  242                 where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset);
  243                 hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset);
  244                 addend = rela->r_addend;
  245                 rtype = ELF_R_TYPE(rela->r_info);
  246                 symidx = ELF_R_SYM(rela->r_info);
  247                 break;
  248         default:
  249                 panic("elf_reloc: unknown relocation mode %d\n", type);
  250         }
  251 
  252         switch (rtype) {
  253 
  254         case R_PPC_NONE:
  255                 break;
  256 
  257         case R_PPC_ADDR32: /* word32 S + A */
  258                 error = lookup(lf, symidx, 1, &addr);
  259                 if (error != 0)
  260                         return -1;
  261                 *where = elf_relocaddr(lf, addr + addend);
  262                         break;
  263 
  264         case R_PPC_ADDR16_LO: /* #lo(S) */
  265                 error = lookup(lf, symidx, 1, &addr);
  266                 if (error != 0)
  267                         return -1;
  268                 /*
  269                  * addend values are sometimes relative to sections
  270                  * (i.e. .rodata) in rela, where in reality they
  271                  * are relative to relocbase. Detect this condition.
  272                  */
  273                 if (addr > relocbase && addr <= (relocbase + addend))
  274                         addr = relocbase;
  275                 addr = elf_relocaddr(lf, addr + addend);
  276                 *hwhere = addr & 0xffff;
  277                 break;
  278 
  279         case R_PPC_ADDR16_HA: /* #ha(S) */
  280                 error = lookup(lf, symidx, 1, &addr);
  281                 if (error != 0)
  282                         return -1;
  283                 /*
  284                  * addend values are sometimes relative to sections
  285                  * (i.e. .rodata) in rela, where in reality they
  286                  * are relative to relocbase. Detect this condition.
  287                  */
  288                 if (addr > relocbase && addr <= (relocbase + addend))
  289                         addr = relocbase;
  290                 addr = elf_relocaddr(lf, addr + addend);
  291                 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
  292                     & 0xffff;
  293                 break;
  294 
  295         case R_PPC_RELATIVE: /* word32 B + A */
  296                 *where = elf_relocaddr(lf, relocbase + addend);
  297                 break;
  298 
  299         default:
  300                 printf("kldload: unexpected relocation type %d\n",
  301                     (int) rtype);
  302                 return -1;
  303         }
  304         return(0);
  305 }
  306 
  307 void
  308 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase)
  309 {
  310         Elf_Rela *rela = NULL, *relalim;
  311         Elf_Addr relasz = 0;
  312         Elf_Addr *where;
  313 
  314         /*
  315          * Extract the rela/relasz values from the dynamic section
  316          */
  317         for (; dynp->d_tag != DT_NULL; dynp++) {
  318                 switch (dynp->d_tag) {
  319                 case DT_RELA:
  320                         rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr);
  321                         break;
  322                 case DT_RELASZ:
  323                         relasz = dynp->d_un.d_val;
  324                         break;
  325                 }
  326         }
  327 
  328         /*
  329          * Relocate these values
  330          */
  331         relalim = (Elf_Rela *)((caddr_t)rela + relasz);
  332         for (; rela < relalim; rela++) {
  333                 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE)
  334                         continue;
  335                 where = (Elf_Addr *)(relocbase + rela->r_offset);
  336                 *where = (Elf_Addr)(relocbase + rela->r_addend);
  337         }
  338 }
  339 
  340 int
  341 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  342     elf_lookup_fn lookup)
  343 {
  344 
  345         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  346 }
  347 
  348 int
  349 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  350     int type, elf_lookup_fn lookup)
  351 {
  352 
  353         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  354 }
  355 
  356 int
  357 elf_cpu_load_file(linker_file_t lf)
  358 {
  359         /* Only sync the cache for non-kernel modules */
  360         if (lf->id != 1)
  361                 __syncicache(lf->address, lf->size);
  362         return (0);
  363 }
  364 
  365 int
  366 elf_cpu_unload_file(linker_file_t lf __unused)
  367 {
  368 
  369         return (0);
  370 }
  371 #endif
  372 
  373 #ifdef __powerpc64__
  374 static void
  375 ppc32_fixlimit(struct rlimit *rl, int which)
  376 {
  377         switch (which) {
  378         case RLIMIT_DATA:
  379                 if (ppc32_maxdsiz != 0) {
  380                         if (rl->rlim_cur > ppc32_maxdsiz)
  381                                 rl->rlim_cur = ppc32_maxdsiz;
  382                         if (rl->rlim_max > ppc32_maxdsiz)
  383                                 rl->rlim_max = ppc32_maxdsiz;
  384                 }
  385                 break;
  386         case RLIMIT_STACK:
  387                 if (ppc32_maxssiz != 0) {
  388                         if (rl->rlim_cur > ppc32_maxssiz)
  389                                 rl->rlim_cur = ppc32_maxssiz;
  390                         if (rl->rlim_max > ppc32_maxssiz)
  391                                 rl->rlim_max = ppc32_maxssiz;
  392                 }
  393                 break;
  394         }
  395 }
  396 #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
