--- /dev/null
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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>
+
+#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32)
+#define ELF_DYNSZ 8
+#define ELF_DYN_TAG 0
+#define ELF_DYN_VAL 4
+#define GOTENT_SZ 4
+#else
+#define ELF_DYNSZ 16
+#define ELF_DYN_TAG 0
+#define ELF_DYN_VAL 8
+#define GOTENT_SZ 8
+#endif
+
+ .text
+ .align 4
+ .type __start,@function
+
+ .ent __start
+ .globl __start
+__start:
+ .set noreorder
+ bal 1f
+ nop
+1:
+#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32)
+ .cpload ra
+#else
+ .cpsetup ra, $0, 1b
+#endif
+ .set reorder
+
+ /* Discover the load address */
+ LA t0, 1b
+ PTR_SUBU t0, ra, t0
+
+#define DT_PLTGOT 3
+#define DT_MIPS_LOCAL_GOTNO 0x7000000a
+
+ /* Search dynamic table for DT_MIPS_LOCAL_GOTNO and DT_PLTGOT values */
+ LA t1, _DYNAMIC
+ PTR_ADDU t1, t0
+ LI t3, DT_PLTGOT
+ LI ta0, DT_MIPS_LOCAL_GOTNO
+0:
+ REG_L t2, ELF_DYN_TAG(t1)
+ beqz t2, .Lrelocate_local_got
+
+ bne t2, t3, 1f /* DT_PLTGOT? */
+ REG_L s0, ELF_DYN_VAL(t1)
+ PTR_ADDU s0, t0
+ b 2f
+
+1:
+ bne t2, ta0, 2f /* DT_MIPS_LOCAL_GOTNO? */
+ REG_L s1, ELF_DYN_VAL(t1)
+
+2: PTR_ADDU t1, ELF_DYNSZ
+ b 0b
+
+.Lrelocate_local_got:
+ /*
+ * Relocate the local GOT entries
+ * got[0] is address of lazy resolver function
+ * got[1] may be used for a GNU extension
+ */
+
+ PTR_ADDU s0, GOTENT_SZ
+ SUBU s1, 1
+ PTR_L t1, (s0)
+ bgez t1, 9f
+ PTR_ADDU s0, GOTENT_SZ
+ SUBU s1, 1
+ b 9f
+
+1: PTR_L t1, (s0)
+ PTR_ADDU t1, t0
+ PTR_S t1, (s0)
+ PTR_ADDU s0, GOTENT_SZ
+9: SUBU s1, 1
+ bgez s1, 1b
+
+ /* call linker_init */
+ move a0, sp
+#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32)
+ PTR_SUBU sp, 4*REGSZ /* space for arg saves in linker_init */
+#endif
+ jal __linker_init
+#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32)
+ PTR_ADDU sp, 4*REGSZ /* restore sp */
+#endif
+ move t9, v0
+ j t9
+ .end __start
+
+/* FIXME:Is this still needed? */
+ .section .ctors, "wa"
+ .globl __CTOR_LIST__
+__CTOR_LIST__:
+ .long -1
}
#if defined(USE_RELA)
-static int soinfo_relocate_a(soinfo* si, ElfW(Rela)* rela, unsigned count, soinfo* needed[]) {
+static int soinfo_relocate(soinfo* si, ElfW(Rela)* rela, unsigned count, soinfo* needed[]) {
ElfW(Sym)* symtab = si->symtab;
const char* strtab = si->strtab;
ElfW(Sym)* s;
}
return 0;
}
-#else
+
+#else // REL, not RELA.
+
static int soinfo_relocate(soinfo* si, ElfW(Rel)* rel, unsigned count, soinfo* needed[]) {
ElfW(Sym)* symtab = si->symtab;
const char* strtab = si->strtab;
break;
#elif defined(__mips__)
case R_MIPS_REL32:
+#if defined(__LP64__)
+ // MIPS Elf64_Rel entries contain compound relocations
+ // We only handle the R_MIPS_NONE|R_MIPS_64|R_MIPS_REL32 case
+ if (ELF64_R_TYPE2(rel->r_info) != R_MIPS_64 ||
+ ELF64_R_TYPE3(rel->r_info) != R_MIPS_NONE) {
+ DL_ERR("Unexpected compound relocation type:%d type2:%d type3:%d @ %p (%d)",
+ type, (unsigned)ELF64_R_TYPE2(rel->r_info),
+ (unsigned)ELF64_R_TYPE3(rel->r_info), rel, (int) (rel - start));
+ return -1;
+ }
+#endif
count_relocation(kRelocAbsolute);
MARK(rel->r_offset);
- TRACE_TYPE(RELO, "RELO REL32 %08x <- %08x %s",
- reloc, sym_addr, (sym_name) ? sym_name : "*SECTIONHDR*");
+ TRACE_TYPE(RELO, "RELO REL32 %08zx <- %08zx %s", static_cast<size_t>(reloc),
+ static_cast<size_t>(sym_addr), sym_name ? sym_name : "*SECTIONHDR*");
if (s) {
*reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr;
} else {
#if defined(__mips__)
static bool mips_relocate_got(soinfo* si, soinfo* needed[]) {
- unsigned* got = si->plt_got;
+ ElfW(Addr)** got = si->plt_got;
if (got == NULL) {
return true;
}
unsigned symtabno = si->mips_symtabno;
ElfW(Sym)* symtab = si->symtab;
- /*
- * got[0] is address of lazy resolver function
- * got[1] may be used for a GNU extension
- * set it to a recognizable address in case someone calls it
- * (should be _rtld_bind_start)
- * FIXME: maybe this should be in a separate routine
- */
-
+ // got[0] is the address of the lazy resolver function.
+ // got[1] may be used for a GNU extension.
+ // Set it to a recognizable address in case someone calls it (should be _rtld_bind_start).
+ // FIXME: maybe this should be in a separate routine?
if ((si->flags & FLAG_LINKER) == 0) {
size_t g = 0;
- got[g++] = 0xdeadbeef;
- if (got[g] & 0x80000000) {
- got[g++] = 0xdeadfeed;
+ got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadbeef);
+ if (reinterpret_cast<intptr_t>(got[g]) < 0) {
+ got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadfeed);
}
- /*
- * Relocate the local GOT entries need to be relocated
- */
+ // Relocate the local GOT entries.
for (; g < local_gotno; g++) {
- got[g] += si->load_bias;
+ got[g] = reinterpret_cast<ElfW(Addr)*>(reinterpret_cast<uintptr_t>(got[g]) + si->load_bias);
}
}
- /* Now for the global GOT entries */
+ // Now for the global GOT entries...
ElfW(Sym)* sym = symtab + gotsym;
got = si->plt_got + local_gotno;
for (size_t g = gotsym; g < symtabno; g++, sym++, got++) {
- const char* sym_name;
- ElfW(Sym)* s;
+ // This is an undefined reference... try to locate it.
+ const char* sym_name = si->strtab + sym->st_name;
soinfo* lsi;
-
- /* This is an undefined reference... try to locate it */
- sym_name = si->strtab + sym->st_name;
- s = soinfo_do_lookup(si, sym_name, &lsi, needed);
+ ElfW(Sym)* s = soinfo_do_lookup(si, sym_name, &lsi, needed);
if (s == NULL) {
- /* We only allow an undefined symbol if this is a weak
- reference.. */
+ // We only allow an undefined symbol if this is a weak reference.
s = &symtab[g];
if (ELF_ST_BIND(s->st_info) != STB_WEAK) {
DL_ERR("cannot locate \"%s\"...", sym_name);
return false;
}
*got = 0;
- }
- else {
- /* FIXME: is this sufficient?
- * For reference see NetBSD link loader
- * http://cvsweb.netbsd.org/bsdweb.cgi/src/libexec/ld.elf_so/arch/mips/mips_reloc.c?rev=1.53&content-type=text/x-cvsweb-markup
- */
- *got = lsi->load_bias + s->st_value;
+ } else {
+ // FIXME: is this sufficient?
+ // For reference see NetBSD link loader
+ // http://cvsweb.netbsd.org/bsdweb.cgi/src/libexec/ld.elf_so/arch/mips/mips_reloc.c?rev=1.53&content-type=text/x-cvsweb-markup
+ *got = reinterpret_cast<ElfW(Addr)*>(lsi->load_bias + s->st_value);
}
}
return true;
si->plt_rel_count = d->d_un.d_val / sizeof(ElfW(Rel));
#endif
break;
-#if !defined(__LP64__)
+#if defined(__mips__)
case DT_PLTGOT:
- // Used by 32-bit MIPS.
- si->plt_got = (unsigned *)(base + d->d_un.d_ptr);
+ // Used by mips and mips64.
+ si->plt_got = reinterpret_cast<ElfW(Addr)**>(base + d->d_un.d_ptr);
break;
#endif
case DT_DEBUG:
// Set the DT_DEBUG entry to the address of _r_debug for GDB
// if the dynamic table is writable
+// FIXME: not working currently for N64
+// The flags for the LOAD and DYNAMIC program headers do not agree.
+// The LOAD section containng the dynamic table has been mapped as
+// read-only, but the DYNAMIC header claims it is writable.
+#if !(defined(__mips__) && defined(__LP64__))
if ((dynamic_flags & PF_W) != 0) {
d->d_un.d_val = reinterpret_cast<uintptr_t>(&_r_debug);
}
break;
+#endif
#if defined(USE_RELA)
case DT_RELA:
si->rela = (ElfW(Rela)*) (base + d->d_un.d_ptr);
#if defined(USE_RELA)
if (si->plt_rela != NULL) {
DEBUG("[ relocating %s plt ]\n", si->name );
- if (soinfo_relocate_a(si, si->plt_rela, si->plt_rela_count, needed)) {
+ if (soinfo_relocate(si, si->plt_rela, si->plt_rela_count, needed)) {
return false;
}
}
if (si->rela != NULL) {
DEBUG("[ relocating %s ]\n", si->name );
- if (soinfo_relocate_a(si, si->rela, si->rela_count, needed)) {
+ if (soinfo_relocate(si, si->rela, si->rela_count, needed)) {
return false;
}
}
#define ELFW(what) ELF32_ ## what
#endif
+// mips64 interprets Elf64_Rel structures' r_info field differently.
+// bionic (like other C libraries) has macros that assume regular ELF files,
+// but the dynamic linker needs to be able to load mips64 ELF files.
+#if defined(__mips__) && defined(__LP64__)
+#undef ELF64_R_SYM
+#undef ELF64_R_TYPE
+#undef ELF64_R_INFO
+#define ELF64_R_SYM(info) (((info) >> 0) & 0xffffffff)
+#define ELF64_R_SSYM(info) (((info) >> 32) & 0xff)
+#define ELF64_R_TYPE3(info) (((info) >> 40) & 0xff)
+#define ELF64_R_TYPE2(info) (((info) >> 48) & 0xff)
+#define ELF64_R_TYPE(info) (((info) >> 56) & 0xff)
+#endif
+
// Returns the address of the page containing address 'x'.
#define PAGE_START(x) ((x) & PAGE_MASK)
typedef void (*linker_function_t)();
-// Android uses REL for 32-bit but only uses RELA for 64-bit.
-#if defined(__LP64__)
+// Android uses RELA for aarch64 and x86_64. mips64 still uses REL.
+#if defined(__aarch64__) || defined(__x86_64__)
#define USE_RELA 1
#endif
unsigned* bucket;
unsigned* chain;
-#if !defined(__LP64__)
- // This is only used by 32-bit MIPS, but needs to be here for
+#if defined(__mips__) || !defined(__LP64__)
+ // This is only used by mips and mips64, but needs to be here for
// all 32-bit architectures to preserve binary compatibility.
- unsigned* plt_got;
+ ElfW(Addr)** plt_got;
#endif
#if defined(USE_RELA)
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