diff options
| author | christos <christos@NetBSD.org> | 1999-02-24 18:25:40 +0000 |
|---|---|---|
| committer | christos <christos@NetBSD.org> | 1999-02-24 18:25:40 +0000 |
| commit | 62926e7ee2ed1f271f1002fc421be5ddd64a9027 (patch) | |
| tree | 439b0d6a192b2b6f5355be7393a7786fe5df9295 /libexec | |
| parent | 6c1ead9587174ef5a720bc23c2a63dd72389e7a5 (diff) | |
Work in progress (does not work yet).
Diffstat (limited to 'libexec')
| -rw-r--r-- | libexec/ld.elf_so/arch/sparc/Makefile.inc | 6 | ||||
| -rw-r--r-- | libexec/ld.elf_so/arch/sparc/mdreloc.c | 282 | ||||
| -rw-r--r-- | libexec/ld.elf_so/arch/sparc/rtld_start.S | 67 |
3 files changed, 355 insertions, 0 deletions
diff --git a/libexec/ld.elf_so/arch/sparc/Makefile.inc b/libexec/ld.elf_so/arch/sparc/Makefile.inc new file mode 100644 index 00000000000..0ef1e31ebcb --- /dev/null +++ b/libexec/ld.elf_so/arch/sparc/Makefile.inc @@ -0,0 +1,6 @@ +# $NetBSD: Makefile.inc,v 1.1 1999/02/24 18:25:40 christos Exp $ + +SRCS+= rtld_start.S mdreloc.c + +CPPFLAGS+= -fpic -DELFSIZE=32 -DRTLD_RELOCATE_SELF +LDFLAGS+= -Bshareable -Bsymbolic -e _rtld_start diff --git a/libexec/ld.elf_so/arch/sparc/mdreloc.c b/libexec/ld.elf_so/arch/sparc/mdreloc.c new file mode 100644 index 00000000000..2e981ee1c17 --- /dev/null +++ b/libexec/ld.elf_so/arch/sparc/mdreloc.c @@ -0,0 +1,282 @@ +/* $NetBSD: mdreloc.c,v 1.1 1999/02/24 18:25:41 christos Exp $ */ + +/*- + * Copyright (c) 1999 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Paul Kranenburg. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * 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. + */ + +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "rtldenv.h" +#include "debug.h" +#include "rtld.h" + +/* + * The following table holds for each relocation type: + * - the width in bits of the memory location the relocation + * applies to (not currently used) + * - the number of bits the relocation value must be shifted to the + * right (i.e. discard least significant bits) to fit into + * the appropriate field in the instruction word. + * - flags indicating whether + * * the relocation involves a symbol + * * the relocation is relative to the current position + * * the relocation is for a GOT entry + * * the relocation is relative to the load address + * + */ +#define _RF_S 0x80000000 /* Resolve symbol */ +#define _RF_A 0x40000000 /* Use addend */ +#define _RF_P 0x20000000 /* Location relative */ +#define _RF_G 0x10000000 /* GOT offset */ +#define _RF_B 0x08000000 /* Load address relative */ +#define _RF_SZ(s) (((s) & 0xff) << 8) /* memory target size */ +#define _RF_RS(s) ( (s) & 0xff) /* right shift */ +static int reloc_target_flags[] = { + 0, /* NONE */ + _RF_S|_RF_A| _RF_SZ(8) | _RF_RS(0), /* RELOC_8 */ + _RF_S|_RF_A| _RF_SZ(16) | _RF_RS(0), /* RELOC_16 */ + _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* RELOC_32 */ + _RF_S|_RF_A|_RF_P| _RF_SZ(8) | _RF_RS(0), /* DISP_8 */ + _RF_S|_RF_A|_RF_P| _RF_SZ(16) | _RF_RS(0), /* DISP_16 */ + _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* DISP_32 */ + _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP_30 */ + _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP_22 */ + _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* HI22 */ + _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 22 */ + _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 13 */ + _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* LO10 */ + _RF_G| _RF_SZ(32) | _RF_RS(0), /* GOT10 */ + _RF_G| _RF_SZ(32) | _RF_RS(0), /* GOT13 */ + _RF_G| _RF_SZ(32) | _RF_RS(10), /* GOT22 */ + _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PC10 */ + _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PC22 */ + _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WPLT30 */ + _RF_SZ(32) | _RF_RS(0), /* COPY */ + _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* GLOB_DAT */ + _RF_SZ(32) | _RF_RS(0), /* JMP_SLOT */ + _RF_A| _RF_SZ(32) | _RF_RS(0), /* RELATIVE */ + _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* UA_32 */ + + /*unknown*/ _RF_SZ(32) | _RF_RS(0), /* PLT32 */ + /*unknown*/ _RF_SZ(32) | _RF_RS(0), /* HIPLT22 */ + /*unknown*/ _RF_SZ(32) | _RF_RS(0), /* LOPLT10 */ + /*unknown*/ _RF_SZ(32) | _RF_RS(0), /* LOPLT10 */ + /*unknown*/ _RF_SZ(32) | _RF_RS(0), /* PCPLT22 */ + /*unknown*/ _RF_SZ(32) | _RF_RS(0), /* PCPLT32 */ + _RF_S|_RF_A|/*unknown*/ _RF_SZ(32) | _RF_RS(0), /* 10 */ + _RF_S|_RF_A|/*unknown*/ _RF_SZ(32) | _RF_RS(0), /* 11 */ + _RF_S|_RF_A|/*unknown*/ _RF_SZ(32) | _RF_RS(0), /* 64 */ + _RF_S|_RF_A|/*unknown*/ _RF_SZ(32) | _RF_RS(0), /* OLO10 */ + _RF_S|_RF_A|/*unknown*/ _RF_SZ(32) | _RF_RS(0), /* HH22 */ + _RF_S|_RF_A|/*unknown*/ _RF_SZ(32) | _RF_RS(0), /* HM10 */ + _RF_S|_RF_A|/*unknown*/ _RF_SZ(32) | _RF_RS(0), /* LM22 */ + _RF_S|_RF_A|_RF_P|/*unknown*/ _RF_SZ(32) | _RF_RS(0), /* WDISP16 */ + _RF_S|_RF_A|_RF_P|/*unknown*/ _RF_SZ(32) | _RF_RS(0), /* WDISP19 */ + /*unknown*/ _RF_SZ(32) | _RF_RS(0), /* GLOB_JMP */ + /*unknown*/ _RF_SZ(32) | _RF_RS(0), /* 7 */ + /*unknown*/ _RF_SZ(32) | _RF_RS(0), /* 5 */ + /*unknown*/ _RF_SZ(32) | _RF_RS(0), /* 6 */ +}; + +#ifdef RTLD_DEBUG_RELOC +static const char *reloc_names[] = { + "NONE", "RELOC_8", "RELOC_16", "RELOC_32", "DISP_8", + "DISP_16", "DISP_32", "WDISP_30", "WDISP_22", "HI22", + "22", "13", "LO10", "GOT10", "GOT13", + "GOT22", "PC10", "PC22", "WPLT30", "COPY", + "GLOB_DAT", "JMP_SLOT", "RELATIVE", "UA_32", "PLT32", + "HIPLT22", "LOPLT10", "LOPLT10", "PCPLT22", "PCPLT32", + "10", "11", "64", "OLO10", "HH22", + "HM10", "LM22", "WDISP16", "WDISP19", "GLOB_JMP", + "7", "5", "6" +}; +#endif + +#define RELOC_RESOLVE_SYMBOL(t) ((reloc_target_flags[t] & _RF_S) != 0) +#define RELOC_PC_RELATIVE(t) ((reloc_target_flags[t] & _RF_P) != 0) +#define RELOC_TARGET_SIZE(t) ((reloc_target_flags[t] >> 8) & 0xff) +#define RELOC_VALUE_RIGHTSHIFT(t) (reloc_target_flags[t] & 0xff) + +static int reloc_target_bitmask[] = { +#define _BM(x) (~(-(1ULL << (x)))) + 0, /* NONE */ + _BM(8), _BM(16), _BM(32), /* RELOC_8, _16, _32 */ + _BM(8), _BM(16), _BM(32), /* DISP8, DISP16, DISP32 */ + _BM(30), _BM(22), /* WDISP30, WDISP22 */ + _BM(22), _BM(22), /* HI22, _22 */ + _BM(13), _BM(10), /* RELOC_13, _LO10 */ + _BM(10), _BM(13), _BM(22), /* GOT10, GOT13, GOT22 */ + _BM(10), _BM(22), /* _PC10, _PC22 */ + _BM(30), 0, /* _WPLT30, _COPY */ + -1, -1, _BM(22), /* _GLOB_DAT, JMP_SLOT, _RELATIVE */ + _BM(32), _BM(32), /* _UA32, PLT32 */ + _BM(22), _BM(10), /* _HIPLT22, LOPLT10 */ + _BM(32), _BM(22), _BM(10), /* _PCPLT32, _PCPLT22, _PCPLT10 */ + _BM(10), _BM(11), -1, /* _10, _11, _64 */ + _BM(10), _BM(22), /* _OLO10, _HH22 */ + _BM(10), _BM(22), /* _HM10, _LM22 */ + _BM(16), _BM(19), /* _WDISP16, _WDISP19 */ + -1, /* GLOB_JMP */ + _BM(7), _BM(5), _BM(6) /* _7, _5, _6 */ +#undef _BM +}; +#define RELOC_VALUE_BITMASK(t) (reloc_target_bitmask[t]) + +int +_rtld_relocate_nonplt_object( + const Obj_Entry *obj, + const Elf_RelA *rela, + bool dodebug) +{ + Elf_Addr *where = (Elf_Addr *) (obj->relocbase + rela->r_offset); + Elf_Word type, value, mask; + const Elf_Sym *def = NULL; + const Obj_Entry *defobj = NULL; + + type = ELF_R_TYPE(rela->r_info); + if (type == R_TYPE(NONE)) + return (0); + + /* + * We use the fact that relocation types are an `enum' + * Note: R_SPARC_6 is currently numerically largest. + */ + if (type > R_TYPE(6)) + return (-1); + + /* + * Handle relative relocs here, because we might not + * be able to access globals yet + */ + if (!dodebug && type == R_TYPE(RELATIVE)) { + *where += (Elf_Addr) obj->relocbase; + return 0; + } + + value = rela->r_addend; + if (RELOC_RESOLVE_SYMBOL(type)) { + + /* Find the symbol */ + def = _rtld_find_symdef(_rtld_objlist, rela->r_info, + NULL, obj, &defobj, false); + if (def == NULL) + return (-1); + + /* Add in the symbol's absolute address */ + value += (Elf_Word)(defobj->relocbase + def->st_value); + } + + if (RELOC_PC_RELATIVE(type)) { + value -= (Elf_Word)where; + } + + mask = RELOC_VALUE_BITMASK(type); + value >>= RELOC_VALUE_RIGHTSHIFT(type); + value &= mask; + + /* We ignore alignment restrictions here */ + *where &= ~mask; + *where |= value; +#ifdef RTLD_DEBUG_RELOC + if (RELOC_RESOLVE_SYMBOL(type)) { + rdbg(dodebug, "%s %s in %s --> %p %s", + reloc_names[type], + defobj->strtab + def->st_name, obj->path, + (void *)*where, defobj->path); + } + else { + rdbg(dodebug, "%s --> %p", reloc_names[type], + (void *)*where); + } +#endif + return (0); +} + +int +_rtld_relocate_plt_object( + const Obj_Entry *obj, + const Elf_RelA *rela, + caddr_t *addrp, + bool bind_now, + bool dodebug) +{ + const Elf_Sym *def; + const Obj_Entry *defobj; + Elf_Addr *where = (Elf_Addr *) (obj->relocbase + rela->r_offset); + Elf_Addr value; + + if (bind_now == 0 && obj->pltgot != NULL) + return (0); + + /* Fully resolve procedure addresses now */ + + assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT)); + + def = _rtld_find_symdef(_rtld_objlist, rela->r_info, + NULL, obj, &defobj, true); + if (def == NULL) + return (-1); + + value = (Elf_Addr) (defobj->relocbase + def->st_value); + + rdbg(dodebug, "bind now %d/fixup in %s --> old=%p new=%p", + (int)bind_now, defobj->strtab + def->st_name, + (void *)*where, (void *)value); + + /* + * At the PLT entry pointed at by `where', we now construct + * a direct transfer to the now fully resolved function + * address. The resulting code in the jump slot is: + * + * sethi %hi(addr), %g1 + * jmp %g1+%lo(addr) + * nop ! delay slot + */ +#define SETHI 0x03000000 +#define JMP 0x81c06000 +#define NOP 0x01000000 + where[0] = SETHI | ((value >> 10) & 0x003fffff); + where[1] = JMP | (value & 0x000003ff); + where[2] = NOP; + + if (addrp != NULL) + *addrp = (caddr_t)value; + + return (0); +} diff --git a/libexec/ld.elf_so/arch/sparc/rtld_start.S b/libexec/ld.elf_so/arch/sparc/rtld_start.S new file mode 100644 index 00000000000..94ee49ca323 --- /dev/null +++ b/libexec/ld.elf_so/arch/sparc/rtld_start.S @@ -0,0 +1,67 @@ +/* $NetBSD: rtld_start.S,v 1.1 1999/02/24 18:25:41 christos Exp $ */ + +/*- + * Copyright (c) 1998 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Christos Zoulas. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * 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. + */ + +#include <machine/asm.h> + + .text + .align 8 + .globl _rtld_start + .type _rtld_start,@function +_rtld_start: + mov 0, %fp + add %sp, 56, %o0 ! &argc - 8 + andn %sp, 7, %sp ! align + sub %sp, 24, %sp ! expand to standard stack frame size + st %g1, [%sp] ! Store ps_strings + + call _rtld,0 ! _rtld(sp) + nop + + ld [%sp - 4], %g3 + ld [%sp - 8], %g2 + ld [%sp - 12], %g1 + ld [%o0], %o0 + call %o0 + + .align 4 + .globl _rtld_bind_start + .type _rtld_bind_start,@function +_rtld_bind_start: # (obj, reloff) + call exit,0 ! exit(random) + nop + ret |
