diff options
Diffstat (limited to 'cpukit/libdl/rtl-mdreloc-sparc.c')
| -rw-r--r-- | cpukit/libdl/rtl-mdreloc-sparc.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/cpukit/libdl/rtl-mdreloc-sparc.c b/cpukit/libdl/rtl-mdreloc-sparc.c new file mode 100644 index 0000000000..a8bf5e15ae --- /dev/null +++ b/cpukit/libdl/rtl-mdreloc-sparc.c @@ -0,0 +1,261 @@ +/* + * Taken from NetBSD and stripped of the relocations not needed on RTEMS. + */ + +/* $NetBSD: mdreloc.c,v 1.43 2010/01/13 20:17:22 christos Exp $ */ + +/*- + * Copyright (c) 1999, 2002 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Paul Kranenburg and by Charles M. Hannum. + * + * 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 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 <sys/cdefs.h> + +#include <stdio.h> + +#include <rtems/rtl/rtl.h> +#include "rtl-elf.h" +#include "rtl-error.h" +#include "rtl-trace.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_U 0x04000000 /* Unaligned */ +#define _RF_SZ(s) (((s) & 0xff) << 8) /* memory target size */ +#define _RF_RS(s) ( (s) & 0xff) /* right shift */ + +static const uint32_t 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_B|_RF_SZ(32) | _RF_RS(0), /* RELATIVE */ + _RF_S|_RF_A| _RF_U|_RF_SZ(32) | _RF_RS(0), /* UA_32 */ +}; + +#define NOT_CURRENTLY_USED_BUT_MAYBE_USEFUL +#ifdef NOT_CURRENTLY_USED_BUT_MAYBE_USEFUL +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" +}; +#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_BASE_RELATIVE(t) ((reloc_target_flags[t] & _RF_B) != 0) +#define RELOC_UNALIGNED(t) ((reloc_target_flags[t] & _RF_U) != 0) +#define RELOC_USE_ADDEND(t) ((reloc_target_flags[t] & _RF_A) != 0) +#define RELOC_TARGET_SIZE(t) ((reloc_target_flags[t] >> 8) & 0xff) +#define RELOC_VALUE_RIGHTSHIFT(t) (reloc_target_flags[t] & 0xff) + +static const 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, -1, /* _GLOB_DAT, JMP_SLOT, _RELATIVE */ + _BM(32) /* _UA32 */ +#undef _BM +}; +#define RELOC_VALUE_BITMASK(t) (reloc_target_bitmask[t]) + +bool +rtems_rtl_elf_rel_resolve_sym (Elf_Word type) +{ + return RELOC_RESOLVE_SYMBOL (type) ? true : false; +} + +bool +rtems_rtl_elf_relocate_rela (const rtems_rtl_obj_t* obj, + const Elf_Rela* rela, + const rtems_rtl_obj_sect_t* sect, + const char* symname, + const Elf_Byte syminfo, + const Elf_Word symvalue) +{ + Elf_Addr *where; + Elf_Word type, value, mask; + + where = (Elf_Addr *) (sect->base + rela->r_offset); + + type = ELF_R_TYPE(rela->r_info); + if (type == R_TYPE(NONE)) + return true; + + /* We do JMP_SLOTs in _rtld_bind() below */ + if (type == R_TYPE(JMP_SLOT)) + return true; + + /* COPY relocs are also handled elsewhere */ + if (type == R_TYPE(COPY)) + return true; + + /* + * We use the fact that relocation types are an `enum' + * Note: R_SPARC_6 is currently numerically largest. + */ + if (type > R_TYPE(6)) + return false; + + value = rela->r_addend; + + /* + * Handle relative relocs here, as an optimization. + */ + if (type == R_TYPE (RELATIVE)) { + *where += (Elf_Addr)(sect->base + value); + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: reloc relative in %s --> %p", + rtems_rtl_obj_oname (obj), (void *)*where); + return true; + } + + if (RELOC_RESOLVE_SYMBOL (type)) { + /* Add in the symbol's absolute address */ + value += symvalue; + } + + if (RELOC_PC_RELATIVE (type)) { + value -= (Elf_Word)where; + } + + if (RELOC_BASE_RELATIVE (type)) { + /* + * Note that even though sparcs use `Elf_rela' + * exclusively we still need the implicit memory addend + * in relocations referring to GOT entries. + * Undoubtedly, someone f*cked this up in the distant + * past, and now we're stuck with it in the name of + * compatibility for all eternity.. + * + * In any case, the implicit and explicit should be + * mutually exclusive. We provide a check for that + * here. + */ +#define DIAGNOSTIC +#ifdef DIAGNOSTIC + if (value != 0 && *where != 0) { + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf("rtl: reloc base_rel(%s): where=%p, *where 0x%lx, " + "addend=0x%lx, base %p\n", + rtems_rtl_obj_oname (obj), + where, *where, rela->r_addend, sect->base); + } +#endif + value += (Elf_Word)(sect->base + *where); + } + + mask = RELOC_VALUE_BITMASK (type); + value >>= RELOC_VALUE_RIGHTSHIFT (type); + value &= mask; + + if (RELOC_UNALIGNED(type)) { + /* Handle unaligned relocations. */ + Elf_Addr tmp = 0; + char *ptr = (char *)where; + int i, size = RELOC_TARGET_SIZE (type) / 8; + + /* Read it in one byte at a time. */ + for (i=0; i<size; i++) + tmp = (tmp << 8) | ptr[i]; + + tmp &= ~mask; + tmp |= value; + + /* Write it back out. */ + for (i=0; i<size; i++) + ptr[i] = ((tmp >> (8*i)) & 0xff); + + } else { + *where &= ~mask; + *where |= value; + } + + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: %s %p @ %p in %s\n", + reloc_names[type], (void *)*where, where, rtems_rtl_obj_oname (obj)); + + + return true; +} + +bool +rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t* obj, + const Elf_Rel* rel, + const rtems_rtl_obj_sect_t* sect, + const char* symname, + const Elf_Byte syminfo, + const Elf_Word symvalue) +{ + printf ("rtl: rel type record not supported; please report\n"); + return false; +} |