diff options
author | dfr <dfr@FreeBSD.org> | 1998-09-04 19:03:57 +0000 |
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committer | dfr <dfr@FreeBSD.org> | 1998-09-04 19:03:57 +0000 |
commit | b5ab30c0dc5fcbceebb8fe7939b9b22b365dbb81 (patch) | |
tree | b5d0a554c070d669d34d1dd16aedbdc80ac19468 /libexec/rtld-elf/alpha | |
parent | cc6d00dd2e04653dd42a1e017648ef5a6865205e (diff) | |
download | FreeBSD-src-b5ab30c0dc5fcbceebb8fe7939b9b22b365dbb81.zip FreeBSD-src-b5ab30c0dc5fcbceebb8fe7939b9b22b365dbb81.tar.gz |
Add alpha support.
Submitted by: John Birrell <jb@cimlogic.com.au> (with extra hacks by me)
Obtained from: Probably NetBSD
Diffstat (limited to 'libexec/rtld-elf/alpha')
-rw-r--r-- | libexec/rtld-elf/alpha/reloc.c | 309 | ||||
-rw-r--r-- | libexec/rtld-elf/alpha/rtld_start.S | 169 |
2 files changed, 478 insertions, 0 deletions
diff --git a/libexec/rtld-elf/alpha/reloc.c b/libexec/rtld-elf/alpha/reloc.c new file mode 100644 index 0000000..e43b12a --- /dev/null +++ b/libexec/rtld-elf/alpha/reloc.c @@ -0,0 +1,309 @@ +/*- + * 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. + * + * $Id: rtld.c,v 1.3 1998/05/01 08:39:27 dfr Exp $ + */ + +/* + * Dynamic linker for ELF. + * + * John Polstra <jdp@polstra.com>. + */ + +#include <sys/param.h> +#include <sys/mman.h> + +#include <dlfcn.h> +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "debug.h" +#include "rtld.h" + +/* + * Debugging support. + */ + +#define assert(cond) ((cond) ? (void) 0 :\ + (msg("oops: " __XSTRING(__LINE__) "\n"), abort())) +#define msg(s) (write(1, s, strlen(s))) +#define trace() msg("trace: " __XSTRING(__LINE__) "\n"); + +extern Elf_Dyn _DYNAMIC; + +/* Relocate a non-PLT object with addend. */ +static int +reloc_non_plt_obj(Obj_Entry *obj_rtld, const Obj_Entry *obj, + const Elf_Rela *rela) +{ + Elf_Addr *where = (Elf_Addr *) (obj->relocbase + rela->r_offset); + + switch (ELF_R_TYPE(rela->r_info)) { + + case R_ALPHA_REFQUAD: { + const Elf_Sym *def; + const Obj_Entry *defobj; + Elf_Addr tmp_value; + + def = find_symdef(ELF_R_SYM(rela->r_info), obj, + &defobj, false); + if (def == NULL) + return -1; + + tmp_value = (Elf_Addr) (defobj->relocbase + + def->st_value) + *where + rela->r_addend; + if (*where != tmp_value) + *where = tmp_value; + } + break; + + case R_ALPHA_GLOB_DAT: { + const Elf_Sym *def; + const Obj_Entry *defobj; + + def = find_symdef(ELF_R_SYM(rela->r_info), obj, + &defobj, false); + if (def == NULL) + return -1; + + if (*where != (Elf_Addr) (defobj->relocbase + + def->st_value)) + *where = (Elf_Addr) (defobj->relocbase + + def->st_value); + } + break; + + case R_ALPHA_RELATIVE: { + if (obj != obj_rtld || + (caddr_t)where < (caddr_t)_GLOBAL_OFFSET_TABLE_ || + (caddr_t)where >= (caddr_t)&_DYNAMIC) + *where += (Elf_Addr) obj->relocbase; + } + break; + + case R_ALPHA_COPY: { + /* + * These are deferred until all other relocations + * have been done. All we do here is make sure + * that the COPY relocation is not in a shared + * library. They are allowed only in executable + * files. + */ + if (!obj->mainprog) { + _rtld_error("%s: Unexpected R_COPY " + " relocation in shared library", + obj->path); + return -1; + } + } + break; + + default: + _rtld_error("%s: Unsupported relocation type %d" + " in non-PLT relocations\n", obj->path, + ELF_R_TYPE(rela->r_info)); + return -1; + } + return(0); +} + +/* Process the non-PLT relocations. */ +int +reloc_non_plt(Obj_Entry *obj, Obj_Entry *obj_rtld) +{ + const Elf_Rel *rellim; + const Elf_Rel *rel; + const Elf_Rela *relalim; + const Elf_Rela *rela; + + /* Perform relocations without addend if there are any: */ + rellim = (const Elf_Rel *) ((caddr_t) obj->rel + obj->relsize); + for (rel = obj->rel; obj->rel != NULL && rel < rellim; rel++) { + Elf_Rela locrela; + + locrela.r_info = rel->r_info; + locrela.r_offset = rel->r_offset; + locrela.r_addend = 0; + if (reloc_non_plt_obj(obj_rtld, obj, &locrela)) + return -1; + } + + /* Perform relocations with addend if there are any: */ + relalim = (const Elf_Rela *) ((caddr_t) obj->rela + obj->relasize); + for (rela = obj->rela; obj->rela != NULL && rela < relalim; rela++) { + if (reloc_non_plt_obj(obj_rtld, obj, rela)) + return -1; + } + return 0; +} + +/* Process the PLT relocations. */ +int +reloc_plt(Obj_Entry *obj, bool bind_now) +{ + const Elf_Rel *rellim; + const Elf_Rel *rel; + const Elf_Rela *relalim; + const Elf_Rela *rela; + + /* Process the PLT relocations without addend if there are any. */ + rellim = (const Elf_Rel *) ((caddr_t) obj->pltrel + obj->pltrelsize); + if (bind_now) { + /* Fully resolve procedure addresses now */ + for (rel = obj->pltrel; obj->pltrel != NULL && rel < rellim; + rel++) { + Elf_Addr *where = (Elf_Addr *) (obj->relocbase + rel->r_offset); + const Elf_Sym *def; + const Obj_Entry *defobj; + + assert(ELF_R_TYPE(rel->r_info) == R_ALPHA_JMP_SLOT); + + def = find_symdef(ELF_R_SYM(rel->r_info), obj, &defobj, true); + if (def == NULL) + return -1; + + *where = (Elf_Addr) (defobj->relocbase + def->st_value); + } + } else { /* Just relocate the GOT slots pointing into the PLT */ + for (rel = obj->pltrel; obj->pltrel != NULL && rel < rellim; + rel++) { + Elf_Addr *where = (Elf_Addr *) + (obj->relocbase + rel->r_offset); + *where += (Elf_Addr) obj->relocbase; + } + } + + /* Process the PLT relocations with addend if there are any. */ + relalim = (const Elf_Rela *) ((caddr_t) obj->pltrela + + obj->pltrelasize); + if (bind_now) { + /* Fully resolve procedure addresses now */ + for (rela = obj->pltrela; obj->pltrela != NULL && rela < relalim; + rel++) { + Elf_Addr *where = (Elf_Addr *) (obj->relocbase + + rela->r_offset); + const Elf_Sym *def; + const Obj_Entry *defobj; + + assert(ELF_R_TYPE(rela->r_info) == R_ALPHA_JMP_SLOT); + + def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj, true); + if (def == NULL) + return -1; + + *where = (Elf_Addr) (defobj->relocbase + def->st_value); + } + } else { /* Just relocate the GOT slots pointing into the PLT */ + for (rela = obj->pltrela; obj->pltrela != NULL && rela < relalim; + rela++) { + Elf_Addr *where = (Elf_Addr *) + (obj->relocbase + rela->r_offset); + *where += (Elf_Addr) obj->relocbase; + } + } + return 0; +} + +/* Process an R_ALPHA_COPY relocation. */ +static int +do_copy_relocation(Obj_Entry *dstobj, const Elf_Rela *rela) +{ + void *dstaddr; + const Elf_Sym *dstsym; + const char *name; + unsigned long hash; + size_t size; + const void *srcaddr; + const Elf_Sym *srcsym; + Obj_Entry *srcobj; + + dstaddr = (void *) (dstobj->relocbase + rela->r_offset); + dstsym = dstobj->symtab + ELF_R_SYM(rela->r_info); + name = dstobj->strtab + dstsym->st_name; + hash = elf_hash(name); + size = dstsym->st_size; + + for (srcobj = dstobj->next; srcobj != NULL; srcobj = srcobj->next) + if ((srcsym = symlook_obj(name, hash, srcobj, false)) != NULL) + break; + + if (srcobj == NULL) { + _rtld_error("Undefined symbol \"%s\" referenced from COPY" + " relocation in %s", name, dstobj->path); + return -1; + } + + srcaddr = (const void *) (srcobj->relocbase + srcsym->st_value); + memcpy(dstaddr, srcaddr, size); + return 0; +} + +/* + * Process the special R_ALPHA_COPY relocations in the main program. These + * copy data from a shared object into a region in the main program's BSS + * segment. + * + * Returns 0 on success, -1 on failure. + */ +int +do_copy_relocations(Obj_Entry *dstobj) +{ + const Elf_Rel *rellim; + const Elf_Rel *rel; + const Elf_Rela *relalim; + const Elf_Rela *rela; + + assert(dstobj->mainprog); /* COPY relocations are invalid elsewhere */ + + rellim = (const Elf_Rel *) ((caddr_t) dstobj->rel + dstobj->relsize); + for (rel = dstobj->rel; dstobj->rel != NULL && rel < rellim; rel++) { + if (ELF_R_TYPE(rel->r_info) == R_ALPHA_COPY) { + Elf_Rela locrela; + + locrela.r_info = rel->r_info; + locrela.r_offset = rel->r_offset; + locrela.r_addend = 0; + if (do_copy_relocation(dstobj, &locrela)) + return -1; + } + } + + relalim = (const Elf_Rela *) ((caddr_t) dstobj->rela + + dstobj->relasize); + for (rela = dstobj->rela; dstobj->rela != NULL && rela < relalim; + rela++) { + if (ELF_R_TYPE(rela->r_info) == R_ALPHA_COPY) { + if (do_copy_relocation(dstobj, rela)) + return -1; + } + } + + return 0; +} diff --git a/libexec/rtld-elf/alpha/rtld_start.S b/libexec/rtld-elf/alpha/rtld_start.S new file mode 100644 index 0000000..e93829f --- /dev/null +++ b/libexec/rtld-elf/alpha/rtld_start.S @@ -0,0 +1,169 @@ +/* $Id$ */ +/* From: NetBSD: rtld_start.S,v 1.1 1996/12/16 20:38:09 cgd Exp */ + +/* + * Copyright 1996 Matt Thomas <matt@3am-software.com> + * 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. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * 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 <machine/asm.h> +#include <machine/pal.h> + +.extern _GLOBAL_OFFSET_TABLE_ + +LEAF(_rtld_start, 0) /* XXX */ + .set noreorder + br pv, $33 +$33: LDGP(pv) + + /* save away the stack pointer */ + + lda s0, 0(sp) /* get argc from stack */ + lda sp, -16(sp) /* space for arguments */ + + /* save ps_strings pointer */ + mov a3, s1 + + /* Step 1 -- Figure out the displacement */ + + br t2, $34 /* get our PC */ +$34: ldiq t3, $34 /* get where the linker thought we were */ + subq t2, t3, t8 /* calculate the displacement */ + + + /* Step 2 -- Find bounds of global offset table */ + + lda t5, _GLOBAL_OFFSET_TABLE_ + addq t8, t5, t9 /* add the displacement */ + lda t4, _DYNAMIC + addq t8, t4, t10 /* add the displacement */ + + /* + * Step 3 -- Every entry in the global offset table needs to + * modified for the displacement before any code will work. + */ + +$35: ldq t1, 0(t9) /* load the value */ + addq t8, t1, t1 /* add the displacement */ + stq t1, 0(t9) /* save the new value */ + lda t9, 8(t9) /* point to next entry */ + cmpult t9, t10, t1 /* are we done? */ + bne t1, $35 /* no, do more */ + + /* + * Ya! Things are far enough so we can do some dynamic linking! + */ + + lda a0, 0(s0) /* initial sp */ + lda a1, -16(s0) /* address for exit proc */ + lda a2, -8(s0) /* address for obj_main */ + CALL(_rtld) /* v0 = _rtld(sp, &exit_proc, &obj_main); */ + + ldq a1, -16(s0) /* our atexit function */ + ldq a2, -8(s0) /* obj_main entry */ + lda sp, 16(sp) /* readjust our stack */ + mov s0, a0 /* stack pointer */ + mov s1, a3 /* ps_strings pointer */ + mov v0, t12 + jsr ra, (v0), 0 /* (*_start)(sp, cleanup, obj); */ + ldgp gp, 0(ra) + + CALL(exit) + halt +END(_rtld_start) + + .set noat + .globl _rtld_bind_start + .ent _rtld_bind_start +_rtld_bind_start: + + lda sp, -168(sp) + .frame sp, 168, $26 + /* Preserve all registers that C normally doesn't. */ + stq $26, 0(sp) + stq $0, 8(sp) + stq $1, 16(sp) + stq $2, 24(sp) + stq $3, 32(sp) + stq $4, 40(sp) + stq $5, 48(sp) + stq $6, 56(sp) + stq $7, 64(sp) + stq $8, 72(sp) + stq $16, 80(sp) + stq $17, 88(sp) + stq $18, 96(sp) + stq $19, 104(sp) + stq $20, 112(sp) + stq $21, 120(sp) + stq $22, 128(sp) + stq $23, 136(sp) + stq $24, 144(sp) + stq $25, 152(sp) + stq $29, 160(sp) + .mask 0x27ff01ff, -168 + /* Set up our $gp */ + br gp, $100 +$100: ldgp gp, 0(gp) + .prologue 1 + /* Set up the arguments for _rtld_bind. */ + ldq a0, 8(t12) /* object structure */ + mov at_reg, a1 /* offset of reloc entry */ + CALL(_rtld_bind) + + /* Move the destination address into position. */ + mov $0, $27 + /* Restore program registers. */ + ldq $26, 0(sp) + ldq $0, 8(sp) + ldq $1, 16(sp) + ldq $2, 24(sp) + ldq $3, 32(sp) + ldq $4, 40(sp) + ldq $5, 48(sp) + ldq $6, 56(sp) + ldq $7, 64(sp) + ldq $8, 72(sp) + ldq $16, 80(sp) + ldq $17, 88(sp) + ldq $18, 96(sp) + ldq $19, 104(sp) + ldq $20, 112(sp) + ldq $21, 120(sp) + ldq $22, 128(sp) + ldq $23, 136(sp) + ldq $24, 144(sp) + ldq $25, 152(sp) + ldq $29, 160(sp) + /* Flush the Icache after having modified the .plt code. */ + imb + /* Clean up and turn control to the destination */ + lda sp, 168(sp) + jmp $31, ($27) + .end _rtld_bind_start + + + + |