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-rw-r--r--sysdeps/ia64/dl-machine.h510
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diff --git a/sysdeps/ia64/dl-machine.h b/sysdeps/ia64/dl-machine.h
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+/* Machine-dependent ELF dynamic relocation inline functions. IA-64 version.
+ Copyright (C) 1995-2014 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef dl_machine_h
+#define dl_machine_h 1
+
+#define ELF_MACHINE_NAME "ia64"
+
+#include <assert.h>
+#include <string.h>
+#include <link.h>
+#include <errno.h>
+#include <dl-fptr.h>
+#include <tls.h>
+
+/* Translate a processor specific dynamic tag to the index
+ in l_info array. */
+#define DT_IA_64(x) (DT_IA_64_##x - DT_LOPROC + DT_NUM)
+
+static inline void __attribute__ ((always_inline))
+__ia64_init_bootstrap_fdesc_table (struct link_map *map)
+{
+ Elf64_Addr *boot_table;
+
+ /* careful: this will be called before got has been relocated... */
+ asm (";; addl %0 = @gprel (_dl_boot_fptr_table), gp" : "=r"(boot_table));
+
+ map->l_mach.fptr_table_len = ELF_MACHINE_BOOT_FPTR_TABLE_LEN;
+ map->l_mach.fptr_table = boot_table;
+}
+
+#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) \
+ __ia64_init_bootstrap_fdesc_table (&bootstrap_map);
+
+/* Return nonzero iff ELF header is compatible with the running host. */
+static inline int __attribute__ ((unused))
+elf_machine_matches_host (const Elf64_Ehdr *ehdr)
+{
+ return ehdr->e_machine == EM_IA_64;
+}
+
+
+/* Return the link-time address of _DYNAMIC. */
+static inline Elf64_Addr __attribute__ ((unused, const))
+elf_machine_dynamic (void)
+{
+ Elf64_Addr *p;
+
+ __asm__ (
+ ".section .sdata\n"
+ " .type __dynamic_ltv#, @object\n"
+ " .size __dynamic_ltv#, 8\n"
+ "__dynamic_ltv:\n"
+ " data8 @ltv(_DYNAMIC#)\n"
+ ".previous\n"
+ " addl %0 = @gprel(__dynamic_ltv#), gp ;;"
+ : "=r" (p));
+
+ return *p;
+}
+
+
+/* Return the run-time load address of the shared object. */
+static inline Elf64_Addr __attribute__ ((unused))
+elf_machine_load_address (void)
+{
+ Elf64_Addr ip;
+ int *p;
+
+ __asm__ (
+ "1: mov %0 = ip\n"
+ ".section .sdata\n"
+ "2: data4 @ltv(1b)\n"
+ " .align 8\n"
+ ".previous\n"
+ " addl %1 = @gprel(2b), gp ;;"
+ : "=r" (ip), "=r" (p));
+
+ return ip - (Elf64_Addr) *p;
+}
+
+/* Set up the loaded object described by L so its unrelocated PLT
+ entries will jump to the on-demand fixup code in dl-runtime.c. */
+
+static inline int __attribute__ ((unused, always_inline))
+elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
+{
+ extern void _dl_runtime_resolve (void);
+ extern void _dl_runtime_profile (void);
+
+ if (lazy)
+ {
+ register Elf64_Addr gp __asm__ ("gp");
+ Elf64_Addr *reserve, doit;
+
+ /*
+ * Careful with the typecast here or it will try to add l-l_addr
+ * pointer elements
+ */
+ reserve = ((Elf64_Addr *)
+ (l->l_info[DT_IA_64 (PLT_RESERVE)]->d_un.d_ptr + l->l_addr));
+ /* Identify this shared object. */
+ reserve[0] = (Elf64_Addr) l;
+
+ /* This function will be called to perform the relocation. */
+ if (!profile)
+ doit = (Elf64_Addr) ELF_PTR_TO_FDESC (&_dl_runtime_resolve)->ip;
+ else
+ {
+ if (GLRO(dl_profile) != NULL
+ && _dl_name_match_p (GLRO(dl_profile), l))
+ {
+ /* This is the object we are looking for. Say that we really
+ want profiling and the timers are started. */
+ GL(dl_profile_map) = l;
+ }
+ doit = (Elf64_Addr) ELF_PTR_TO_FDESC (&_dl_runtime_profile)->ip;
+ }
+
+ reserve[1] = doit;
+ reserve[2] = gp;
+ }
+
+ return lazy;
+}
+
+/* Names of the architecture-specific auditing callback functions. */
+#define ARCH_LA_PLTENTER ia64_gnu_pltenter
+#define ARCH_LA_PLTEXIT ia64_gnu_pltexit
+
+/* Undo the adds out0 = 16, sp below to get at the value we want in
+ __libc_stack_end. */
+#define DL_STACK_END(cookie) \
+ ((void *) (((long) (cookie)) - 16))
+
+/* Initial entry point code for the dynamic linker.
+ The C function `_dl_start' is the real entry point;
+ its return value is the user program's entry point. */
+
+#define RTLD_START asm ( \
+".text\n" \
+" .global _start#\n" \
+" .proc _start#\n" \
+"_start:\n" \
+"0: { .mii\n" \
+" .prologue\n" \
+" .save rp, r0\n" \
+" .body\n" \
+" .prologue\n" \
+" .save ar.pfs, r32\n" \
+" alloc loc0 = ar.pfs, 0, 3, 4, 0\n" \
+" .body\n" \
+" mov r2 = ip\n" \
+" addl r3 = @gprel(0b), r0\n" \
+" ;;\n" \
+" }\n" \
+" { .mlx\n" \
+" /* Calculate the GP, and save a copy in loc1. */\n" \
+" sub gp = r2, r3\n" \
+" movl r8 = 0x9804c0270033f\n" \
+" ;;\n" \
+" }\n" \
+" { .mii\n" \
+" mov ar.fpsr = r8\n" \
+" sub loc1 = r2, r3\n" \
+" /* _dl_start wants a pointer to the pointer to the arg block and\n" \
+" the arg block starts with an integer, thus the magic 16. */\n" \
+" adds out0 = 16, sp\n" \
+" }\n" \
+" { .bbb\n" \
+" br.call.sptk.many b0 = _dl_start#\n" \
+" ;;\n" \
+" }\n" \
+" .endp _start#\n" \
+" /* FALLTHRU */\n" \
+" .global _dl_start_user#\n" \
+" .proc _dl_start_user#\n" \
+"_dl_start_user:\n" \
+" .prologue\n" \
+" .save rp, r0\n" \
+" .body\n" \
+" .prologue\n" \
+" .save ar.pfs, r32\n" \
+" .body\n" \
+" { .mii\n" \
+" addl r3 = @gprel(_dl_skip_args), gp\n" \
+" adds r11 = 24, sp /* Load the address of argv. */\n" \
+" /* Save the pointer to the user entry point fptr in loc2. */\n" \
+" mov loc2 = ret0\n" \
+" ;;\n" \
+" }\n" \
+" { .mii\n" \
+" ld4 r3 = [r3]\n" \
+" adds r10 = 16, sp /* Load the address of argc. */\n" \
+" mov out2 = r11\n" \
+" ;;\n" \
+" /* See if we were run as a command with the executable file\n" \
+" name as an extra leading argument. If so, adjust the argv\n" \
+" pointer to skip _dl_skip_args words.\n" \
+" Note that _dl_skip_args is an integer, not a long - Jes\n" \
+"\n" \
+" The stack pointer has to be 16 byte aligned. We cannot simply\n" \
+" addjust the stack pointer. We have to move the whole argv and\n" \
+" envp and adjust _dl_argv by _dl_skip_args. H.J. */\n" \
+" }\n" \
+" { .mib\n" \
+" ld8 out1 = [r10] /* is argc actually stored as a long\n" \
+" or as an int? */\n" \
+" addl r2 = @ltoff(_dl_argv), gp\n" \
+" ;;\n" \
+" }\n" \
+" { .mmi\n" \
+" ld8 r2 = [r2] /* Get the address of _dl_argv. */\n" \
+" sub out1 = out1, r3 /* Get the new argc. */\n" \
+" shladd r3 = r3, 3, r0\n" \
+" ;;\n" \
+" }\n" \
+" {\n" \
+" .mib\n" \
+" ld8 r17 = [r2] /* Get _dl_argv. */\n" \
+" add r15 = r11, r3 /* The address of the argv we move */\n" \
+" ;;\n" \
+" }\n" \
+" /* ??? Could probably merge these two loops into 3 bundles.\n" \
+" using predication to control which set of copies we're on. */\n" \
+"1: /* Copy argv. */\n" \
+" { .mfi\n" \
+" ld8 r16 = [r15], 8 /* Load the value in the old argv. */\n" \
+" ;;\n" \
+" }\n" \
+" { .mib\n" \
+" st8 [r11] = r16, 8 /* Store it in the new argv. */\n" \
+" cmp.ne p6, p7 = 0, r16\n" \
+"(p6) br.cond.dptk.few 1b\n" \
+" ;;\n" \
+" }\n" \
+" { .mmi\n" \
+" mov out3 = r11\n" \
+" sub r17 = r17, r3 /* Substract _dl_skip_args. */\n" \
+" addl out0 = @gprel(_rtld_local), gp\n" \
+" }\n" \
+"1: /* Copy env. */\n" \
+" { .mfi\n" \
+" ld8 r16 = [r15], 8 /* Load the value in the old env. */\n" \
+" ;;\n" \
+" }\n" \
+" { .mib\n" \
+" st8 [r11] = r16, 8 /* Store it in the new env. */\n" \
+" cmp.ne p6, p7 = 0, r16\n" \
+"(p6) br.cond.dptk.few 1b\n" \
+" ;;\n" \
+" }\n" \
+" { .mmb\n" \
+" st8 [r10] = out1 /* Record the new argc. */\n" \
+" ld8 out0 = [out0] /* get the linkmap */\n" \
+" }\n" \
+" { .mmb\n" \
+" st8 [r2] = r17 /* Load the new _dl_argv. */\n" \
+" br.call.sptk.many b0 = _dl_init_internal#\n" \
+" ;;\n" \
+" }\n" \
+" /* Pass our finalizer function to the user,\n" \
+" and jump to the user's entry point. */\n" \
+" { .mmi\n" \
+" ld8 r3 = [loc2], 8\n" \
+" mov b0 = r0\n" \
+" }\n" \
+" { .mmi\n" \
+" addl ret0 = @ltoff(@fptr(_dl_fini#)), gp\n" \
+" ;;\n" \
+" mov b6 = r3\n" \
+" }\n" \
+" { .mmi\n" \
+" ld8 ret0 = [ret0]\n" \
+" ld8 gp = [loc2]\n" \
+" mov ar.pfs = loc0\n" \
+" ;;\n" \
+" }\n" \
+" { .mfb\n" \
+" br.sptk.many b6\n" \
+" ;;\n" \
+" }\n" \
+" .endp _dl_start_user#\n" \
+".previous\n");
+
+
+#ifndef RTLD_START_SPECIAL_INIT
+#define RTLD_START_SPECIAL_INIT /* nothing */
+#endif
+
+/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or TLS
+ variable, so undefined references should not be allowed to define the
+ value.
+ ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
+ of the main executable's symbols, as for a COPY reloc, which we don't
+ use. */
+/* ??? Ignore *MSB for now. */
+#define elf_machine_type_class(type) \
+ (((type) == R_IA64_IPLTLSB || (type) == R_IA64_DTPMOD64LSB \
+ || (type) == R_IA64_DTPREL64LSB || (type) == R_IA64_TPREL64LSB) \
+ * ELF_RTYPE_CLASS_PLT)
+
+/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
+#define ELF_MACHINE_JMP_SLOT R_IA64_IPLTLSB
+
+/* According to the IA-64 specific documentation, Rela is always used. */
+#define ELF_MACHINE_NO_REL 1
+
+/* Return the address of the entry point. */
+#define ELF_MACHINE_START_ADDRESS(map, start) \
+({ \
+ ElfW(Addr) addr; \
+ DL_DT_FUNCTION_ADDRESS(map, start, static, addr) \
+ addr; \
+})
+
+/* Fixup a PLT entry to bounce directly to the function at VALUE. */
+static inline struct fdesc __attribute__ ((always_inline))
+elf_machine_fixup_plt (struct link_map *l, lookup_t t,
+ const Elf64_Rela *reloc,
+ Elf64_Addr *reloc_addr, struct fdesc value)
+{
+ /* l is the link_map for the caller, t is the link_map for the object
+ * being called */
+ /* got has already been relocated in elf_get_dynamic_info() */
+ reloc_addr[1] = value.gp;
+ /* we need a "release" here to ensure that the gp is visible before
+ the code entry point is updated: */
+ ((volatile Elf64_Addr *) reloc_addr)[0] = value.ip;
+ return value;
+}
+
+/* Return the final value of a plt relocation. */
+static inline struct fdesc
+elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc,
+ struct fdesc value)
+{
+ /* No need to handle rel vs rela since IA64 is rela only */
+ return (struct fdesc) { value.ip + reloc->r_addend, value.gp };
+}
+
+#endif /* !dl_machine_h */
+
+#ifdef RESOLVE_MAP
+
+#define R_IA64_TYPE(R) ((R) & -8)
+#define R_IA64_FORMAT(R) ((R) & 7)
+
+#define R_IA64_FORMAT_32MSB 4
+#define R_IA64_FORMAT_32LSB 5
+#define R_IA64_FORMAT_64MSB 6
+#define R_IA64_FORMAT_64LSB 7
+
+
+/* Perform the relocation specified by RELOC and SYM (which is fully
+ resolved). MAP is the object containing the reloc. */
+auto inline void
+__attribute ((always_inline))
+elf_machine_rela (struct link_map *map,
+ const Elf64_Rela *reloc,
+ const Elf64_Sym *sym,
+ const struct r_found_version *version,
+ void *const reloc_addr_arg,
+ int skip_ifunc)
+{
+ Elf64_Addr *const reloc_addr = reloc_addr_arg;
+ const unsigned long int r_type = ELF64_R_TYPE (reloc->r_info);
+ Elf64_Addr value;
+
+#if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC && !defined SHARED
+ /* This is defined in rtld.c, but nowhere in the static libc.a; make the
+ reference weak so static programs can still link. This declaration
+ cannot be done when compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP)
+ because rtld.c contains the common defn for _dl_rtld_map, which is
+ incompatible with a weak decl in the same file. */
+ weak_extern (_dl_rtld_map);
+#endif
+
+ /* We cannot use a switch here because we cannot locate the switch
+ jump table until we've self-relocated. */
+
+#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
+ if (__builtin_expect (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_REL64LSB),
+ 0))
+ {
+ assert (ELF64_R_TYPE (reloc->r_info) == R_IA64_REL64LSB);
+ value = *reloc_addr;
+# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
+ /* Already done in dynamic linker. */
+ if (map != &GL(dl_rtld_map))
+# endif
+ value += map->l_addr;
+ }
+ else
+#endif
+ if (__builtin_expect (r_type == R_IA64_NONE, 0))
+ return;
+ else
+ {
+ struct link_map *sym_map;
+
+ /* RESOLVE_MAP() will return NULL if it fail to locate the symbol. */
+ if ((sym_map = RESOLVE_MAP (&sym, version, r_type)))
+ {
+ value = sym_map->l_addr + sym->st_value + reloc->r_addend;
+
+ if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DIR64LSB))
+ ;/* No adjustment. */
+ else if (r_type == R_IA64_IPLTLSB)
+ {
+ elf_machine_fixup_plt (NULL, NULL, reloc, reloc_addr,
+ DL_FIXUP_MAKE_VALUE (sym_map, value));
+ return;
+ }
+ else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_FPTR64LSB))
+ value = _dl_make_fptr (sym_map, sym, value);
+ else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_PCREL64LSB))
+ value -= (Elf64_Addr) reloc_addr & -16;
+ else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DTPMOD64LSB))
+#ifdef RTLD_BOOTSTRAP
+ /* During startup the dynamic linker is always index 1. */
+ value = 1;
+#else
+ /* Get the information from the link map returned by the
+ resolv function. */
+ value = sym_map->l_tls_modid;
+ else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DTPREL64LSB))
+ value -= sym_map->l_addr;
+#endif
+ else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_TPREL64LSB))
+ {
+#ifndef RTLD_BOOTSTRAP
+ CHECK_STATIC_TLS (map, sym_map);
+#endif
+ value += sym_map->l_tls_offset - sym_map->l_addr;
+ }
+ else
+ _dl_reloc_bad_type (map, r_type, 0);
+ }
+ else
+ value = 0;
+ }
+
+ /* ??? Ignore MSB and Instruction format for now. */
+ if (R_IA64_FORMAT (r_type) == R_IA64_FORMAT_64LSB)
+ *reloc_addr = value;
+ else if (R_IA64_FORMAT (r_type) == R_IA64_FORMAT_32LSB)
+ *(int *) reloc_addr = value;
+ else if (r_type == R_IA64_IPLTLSB)
+ {
+ reloc_addr[0] = 0;
+ reloc_addr[1] = 0;
+ }
+ else
+ _dl_reloc_bad_type (map, r_type, 0);
+}
+
+/* Let do-rel.h know that on IA-64 if l_addr is 0, all RELATIVE relocs
+ can be skipped. */
+#define ELF_MACHINE_REL_RELATIVE 1
+
+auto inline void
+__attribute ((always_inline))
+elf_machine_rela_relative (Elf64_Addr l_addr, const Elf64_Rela *reloc,
+ void *const reloc_addr_arg)
+{
+ Elf64_Addr *const reloc_addr = reloc_addr_arg;
+ /* ??? Ignore MSB and Instruction format for now. */
+ assert (ELF64_R_TYPE (reloc->r_info) == R_IA64_REL64LSB);
+
+ *reloc_addr += l_addr;
+}
+
+/* Perform a RELATIVE reloc on the .got entry that transfers to the .plt. */
+auto inline void
+__attribute ((always_inline))
+elf_machine_lazy_rel (struct link_map *map,
+ Elf64_Addr l_addr, const Elf64_Rela *reloc,
+ int skip_ifunc)
+{
+ Elf64_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
+ const unsigned long int r_type = ELF64_R_TYPE (reloc->r_info);
+
+ if (r_type == R_IA64_IPLTLSB)
+ {
+ reloc_addr[0] += l_addr;
+ reloc_addr[1] += l_addr;
+ }
+ else if (r_type == R_IA64_NONE)
+ return;
+ else
+ _dl_reloc_bad_type (map, r_type, 1);
+}
+
+#endif /* RESOLVE_MAP */