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authorchristos <christos@NetBSD.org>1999-02-24 18:25:40 +0000
committerchristos <christos@NetBSD.org>1999-02-24 18:25:40 +0000
commit62926e7ee2ed1f271f1002fc421be5ddd64a9027 (patch)
tree439b0d6a192b2b6f5355be7393a7786fe5df9295 /libexec
parent6c1ead9587174ef5a720bc23c2a63dd72389e7a5 (diff)
Work in progress (does not work yet).
Diffstat (limited to 'libexec')
-rw-r--r--libexec/ld.elf_so/arch/sparc/Makefile.inc6
-rw-r--r--libexec/ld.elf_so/arch/sparc/mdreloc.c282
-rw-r--r--libexec/ld.elf_so/arch/sparc/rtld_start.S67
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