diff options
Diffstat (limited to 'sysdeps/s390/s390-32/dl-machine.h')
| -rw-r--r-- | sysdeps/s390/s390-32/dl-machine.h | 522 |
1 files changed, 0 insertions, 522 deletions
diff --git a/sysdeps/s390/s390-32/dl-machine.h b/sysdeps/s390/s390-32/dl-machine.h deleted file mode 100644 index 2e3c77c58e..0000000000 --- a/sysdeps/s390/s390-32/dl-machine.h +++ /dev/null @@ -1,522 +0,0 @@ -/* Machine-dependent ELF dynamic relocation inline functions. S390 Version. - Copyright (C) 2000-2017 Free Software Foundation, Inc. - Contributed by Carl Pederson & Martin Schwidefsky. - 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 - -#define ELF_MACHINE_NAME "s390" - -#include <sys/param.h> -#include <string.h> -#include <link.h> -#include <sysdeps/s390/dl-procinfo.h> -#include <dl-irel.h> - -/* This is an older, now obsolete value. */ -#define EM_S390_OLD 0xA390 - -/* Return nonzero iff ELF header is compatible with the running host. */ -static inline int -elf_machine_matches_host (const Elf32_Ehdr *ehdr) -{ - /* Check if the kernel provides the high gpr facility if needed by - the binary. */ - if ((ehdr->e_flags & EF_S390_HIGH_GPRS) - && !(GLRO (dl_hwcap) & HWCAP_S390_HIGH_GPRS)) - return 0; - - return (ehdr->e_machine == EM_S390 || ehdr->e_machine == EM_S390_OLD) - && ehdr->e_ident[EI_CLASS] == ELFCLASS32; -} - - -/* Return the link-time address of _DYNAMIC. Conveniently, this is the - first element of the GOT. This must be inlined in a function which - uses global data. */ - -static inline Elf32_Addr -elf_machine_dynamic (void) -{ - register Elf32_Addr *got; - - __asm__( " bras %0,2f\n" - "1: .long _GLOBAL_OFFSET_TABLE_-1b\n" - "2: al %0,0(%0)" - : "=&a" (got) : : "0" ); - - return *got; -} - - -/* Return the run-time load address of the shared object. */ -static inline Elf32_Addr -elf_machine_load_address (void) -{ - Elf32_Addr addr; - - __asm__( " bras 1,2f\n" - "1: .long _GLOBAL_OFFSET_TABLE_ - 1b\n" - " .long (_dl_start - 1b - 0x80000000) & 0x00000000ffffffff\n" - "2: l %0,4(1)\n" - " ar %0,1\n" - " al 1,0(1)\n" - " sl %0,_dl_start@GOT(1)" - : "=&d" (addr) : : "1" ); - return addr; -} - -/* 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)) -elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) -{ - extern void _dl_runtime_resolve (Elf32_Word); - extern void _dl_runtime_profile (Elf32_Word); -#if defined HAVE_S390_VX_ASM_SUPPORT - extern void _dl_runtime_resolve_vx (Elf32_Word); - extern void _dl_runtime_profile_vx (Elf32_Word); -#endif - - - if (l->l_info[DT_JMPREL] && lazy) - { - /* The GOT entries for functions in the PLT have not yet been filled - in. Their initial contents will arrange when called to push an - offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1], - and then jump to _GLOBAL_OFFSET_TABLE[2]. */ - Elf32_Addr *got; - got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]); - /* If a library is prelinked but we have to relocate anyway, - we have to be able to undo the prelinking of .got.plt. - The prelinker saved us here address of .plt + 0x2c. */ - if (got[1]) - { - l->l_mach.plt = got[1] + l->l_addr; - l->l_mach.jmprel = (const Elf32_Rela *) D_PTR (l, l_info[DT_JMPREL]); - } - got[1] = (Elf32_Addr) l; /* Identify this shared object. */ - - /* The got[2] entry contains the address of a function which gets - called to get the address of a so far unresolved function and - jump to it. The profiling extension of the dynamic linker allows - to intercept the calls to collect information. In this case we - don't store the address in the GOT so that all future calls also - end in this function. */ - if (__glibc_unlikely (profile)) - { -#if defined HAVE_S390_VX_ASM_SUPPORT - if (GLRO(dl_hwcap) & HWCAP_S390_VX) - got[2] = (Elf32_Addr) &_dl_runtime_profile_vx; - else - got[2] = (Elf32_Addr) &_dl_runtime_profile; -#else - got[2] = (Elf32_Addr) &_dl_runtime_profile; -#endif - - 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; - } - else - { - /* This function will get called to fix up the GOT entry indicated by - the offset on the stack, and then jump to the resolved address. */ -#if defined HAVE_S390_VX_ASM_SUPPORT - if (GLRO(dl_hwcap) & HWCAP_S390_VX) - got[2] = (Elf32_Addr) &_dl_runtime_resolve_vx; - else - got[2] = (Elf32_Addr) &_dl_runtime_resolve; -#else - got[2] = (Elf32_Addr) &_dl_runtime_resolve; -#endif - } - } - - return lazy; -} - -/* Mask identifying addresses reserved for the user program, - where the dynamic linker should not map anything. */ -#define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL - -/* 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__ ("\n\ -.text\n\ -.align 4\n\ -.globl _start\n\ -.globl _dl_start_user\n\ -_start:\n\ - basr %r13,0\n\ -0: ahi %r13,.Llit-0b\n\ - lr %r2,%r15\n\ - # Alloc stack frame\n\ - ahi %r15,-96\n\ - # Set the back chain to zero\n\ - xc 0(4,%r15),0(%r15)\n\ - # Call _dl_start with %r2 pointing to arg on stack\n\ - l %r14,.Ladr1-.Llit(%r13)\n\ - bas %r14,0(%r14,%r13) # call _dl_start\n\ -_dl_start_user:\n\ - # Save the user entry point address in %r8.\n\ - lr %r8,%r2\n\ - # Point %r12 at the GOT.\n\ - l %r12,.Ladr0-.Llit(%r13)\n\ - ar %r12,%r13\n\ - # See if we were run as a command with the executable file\n\ - # name as an extra leading argument.\n\ - l %r1,_dl_skip_args@GOT(%r12)\n\ - l %r1,0(%r1) # load _dl_skip_args\n\ - ltr %r1,%r1\n\ - je 4f # Skip the arg adjustment if there were none.\n\ - # Get the original argument count.\n\ - l %r0,96(%r15)\n\ - # Subtract _dl_skip_args from it.\n\ - sr %r0,%r1\n\ - # Store back the modified argument count.\n\ - st %r0,96(%r15)\n\ - # Copy argv and envp forward to account for skipped argv entries.\n\ - # We skipped at least one argument or we would not get here.\n\ - la %r6,100(%r15) # Destination pointer i.e. &argv[0]\n\ - lr %r5,%r6\n\ - lr %r0,%r1\n\ - sll %r0,2\n # Number of skipped bytes.\n\ - ar %r5,%r0 # Source pointer = Dest + Skipped args.\n\ - # argv copy loop:\n\ -1: l %r7,0(%r5) # Load a word from the source.\n\ - st %r7,0(%r6) # Store the word in the destination.\n\ - ahi %r5,4\n\ - ahi %r6,4\n\ - ltr %r7,%r7\n\ - jne 1b # Stop after copying the NULL.\n\ - # envp copy loop:\n\ -2: l %r7,0(%r5) # Load a word from the source.\n\ - st %r7,0(%r6) # Store the word in the destination.\n\ - ahi %r5,4\n\ - ahi %r6,4\n\ - ltr %r7,%r7\n\ - jne 2b # Stop after copying the NULL.\n\ - # Now we have to zero out the envp entries after NULL to allow\n\ - # start.S to properly find auxv by skipping zeroes.\n\ - # zero out loop:\n\ - lhi %r7,0\n\ -3: st %r7,0(%r6) # Store zero.\n\ - ahi %r6,4 # Advance dest pointer.\n\ - ahi %r1,-1 # Subtract one from the word count.\n\ - ltr %r1,%r1\n\ - jne 3b # Keep copying if the word count is non-zero.\n\ - # Adjust _dl_argv\n\ - la %r6,100(%r15)\n\ - l %r1,_dl_argv@GOT(%r12)\n\ - st %r6,0(%r1)\n\ - # The special initializer gets called with the stack just\n\ - # as the application's entry point will see it; it can\n\ - # switch stacks if it moves these contents over.\n\ -" RTLD_START_SPECIAL_INIT "\n\ - # Call the function to run the initializers.\n\ - # Load the parameters:\n\ - # (%r2, %r3, %r4, %r5) = (_dl_loaded, argc, argv, envp)\n\ -4: l %r2,_rtld_local@GOT(%r12)\n\ - l %r2,0(%r2)\n\ - l %r3,96(%r15)\n\ - la %r4,100(%r15)\n\ - lr %r5,%r3\n\ - sll %r5,2\n\ - la %r5,104(%r5,%r15)\n\ - l %r1,.Ladr4-.Llit(%r13)\n\ - bas %r14,0(%r1,%r13)\n\ - # Pass our finalizer function to the user in %r14, as per ELF ABI.\n\ - l %r14,_dl_fini@GOT(%r12)\n\ - # Free stack frame\n\ - ahi %r15,96\n\ - # Jump to the user's entry point (saved in %r8).\n\ - br %r8\n\ -.Llit:\n\ -.Ladr0: .long _GLOBAL_OFFSET_TABLE_-.Llit\n\ -.Ladr1: .long _dl_start-.Llit\n\ -.Ladr4: .long _dl_init@PLT-.Llit\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_COPY iff TYPE should not be allowed to resolve to one - of the main executable's symbols, as for a COPY reloc. */ -#define elf_machine_type_class(type) \ - ((((type) == R_390_JMP_SLOT || (type) == R_390_TLS_DTPMOD \ - || (type) == R_390_TLS_DTPOFF || (type) == R_390_TLS_TPOFF) \ - * ELF_RTYPE_CLASS_PLT) \ - | (((type) == R_390_COPY) * ELF_RTYPE_CLASS_COPY)) - -/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ -#define ELF_MACHINE_JMP_SLOT R_390_JMP_SLOT - -/* The S390 never uses Elf32_Rel relocations. */ -#define ELF_MACHINE_NO_REL 1 -#define ELF_MACHINE_NO_RELA 0 - -/* We define an initialization functions. This is called very early in - _dl_sysdep_start. */ -#define DL_PLATFORM_INIT dl_platform_init () - -static inline void __attribute__ ((unused)) -dl_platform_init (void) -{ - if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0') - /* Avoid an empty string which would disturb us. */ - GLRO(dl_platform) = NULL; -} - -static inline Elf32_Addr -elf_machine_fixup_plt (struct link_map *map, lookup_t t, - const Elf32_Rela *reloc, - Elf32_Addr *reloc_addr, Elf32_Addr value) -{ - return *reloc_addr = value; -} - -/* Return the final value of a plt relocation. */ -static inline Elf32_Addr -elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc, - Elf32_Addr value) -{ - return value; -} - -/* Names of the architecture-specific auditing callback functions. */ -#define ARCH_LA_PLTENTER s390_32_gnu_pltenter -#define ARCH_LA_PLTEXIT s390_32_gnu_pltexit - -#endif /* !dl_machine_h */ - - -#ifdef RESOLVE_MAP - -/* 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 Elf32_Rela *reloc, - const Elf32_Sym *sym, const struct r_found_version *version, - void *const reloc_addr_arg, int skip_ifunc) -{ - Elf32_Addr *const reloc_addr = reloc_addr_arg; - const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); - -#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC - if (__glibc_unlikely (r_type == R_390_RELATIVE)) - { -# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC - /* 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. */ -# ifndef SHARED - weak_extern (GL(dl_rtld_map)); -# endif - if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */ -# endif - *reloc_addr = map->l_addr + reloc->r_addend; - } - else -#endif - if (__glibc_unlikely (r_type == R_390_NONE)) - return; - else - { -#if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP - /* Only needed for R_390_COPY below. */ - const Elf32_Sym *const refsym = sym; -#endif - struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); - Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value; - - if (sym != NULL - && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0) - && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1) - && __builtin_expect (!skip_ifunc, 1)) - value = elf_ifunc_invoke (value); - - switch (r_type) - { - case R_390_IRELATIVE: - value = map->l_addr + reloc->r_addend; - if (__glibc_likely (!skip_ifunc)) - value = elf_ifunc_invoke (value); - *reloc_addr = value; - break; - - case R_390_GLOB_DAT: - case R_390_JMP_SLOT: - *reloc_addr = value + reloc->r_addend; - break; - -#ifndef RESOLVE_CONFLICT_FIND_MAP - case R_390_TLS_DTPMOD: -# ifdef RTLD_BOOTSTRAP - /* During startup the dynamic linker is always the module - with index 1. - XXX If this relocation is necessary move before RESOLVE - call. */ - *reloc_addr = 1; -# else - /* Get the information from the link map returned by the - resolv function. */ - if (sym_map != NULL) - *reloc_addr = sym_map->l_tls_modid; -# endif - break; - case R_390_TLS_DTPOFF: -# ifndef RTLD_BOOTSTRAP - /* During relocation all TLS symbols are defined and used. - Therefore the offset is already correct. */ - if (sym != NULL) - *reloc_addr = sym->st_value + reloc->r_addend; -# endif - break; - case R_390_TLS_TPOFF: - /* The offset is negative, forward from the thread pointer. */ -# ifdef RTLD_BOOTSTRAP - *reloc_addr = sym->st_value + reloc->r_addend - map->l_tls_offset; -# else - /* We know the offset of the object the symbol is contained in. - It is a negative value which will be added to the - thread pointer. */ - if (sym != NULL) - { - CHECK_STATIC_TLS (map, sym_map); - *reloc_addr = (sym->st_value + reloc->r_addend - - sym_map->l_tls_offset); - } -#endif - break; -#endif /* use TLS */ - -#ifndef RTLD_BOOTSTRAP -# ifndef RESOLVE_CONFLICT_FIND_MAP - /* Not needed in dl-conflict.c. */ - case R_390_COPY: - if (sym == NULL) - /* This can happen in trace mode if an object could not be - found. */ - break; - if (__builtin_expect (sym->st_size > refsym->st_size, 0) - || (__builtin_expect (sym->st_size < refsym->st_size, 0) - && __builtin_expect (GLRO(dl_verbose), 0))) - { - const char *strtab; - - strtab = (const char *) D_PTR(map,l_info[DT_STRTAB]); - _dl_error_printf ("\ -%s: Symbol `%s' has different size in shared object, consider re-linking\n", - RTLD_PROGNAME, strtab + refsym->st_name); - } - memcpy (reloc_addr_arg, (void *) value, - MIN (sym->st_size, refsym->st_size)); - break; -# endif - case R_390_32: - *reloc_addr = value + reloc->r_addend; - break; - case R_390_16: - *(unsigned short *) reloc_addr = value + reloc->r_addend; - break; - case R_390_8: - *(char *) reloc_addr = value + reloc->r_addend; - break; -# ifndef RESOLVE_CONFLICT_FIND_MAP - case R_390_PC32: - *reloc_addr = value + reloc->r_addend - (Elf32_Addr) reloc_addr; - break; - case R_390_PC16DBL: - *(unsigned short *) reloc_addr = (unsigned short) - ((short) (value + reloc->r_addend - (Elf32_Addr) reloc_addr) >> 1); - break; - case R_390_PC32DBL: - *(unsigned int *) reloc_addr = (unsigned int) - ((int) (value + reloc->r_addend - (Elf32_Addr) reloc_addr) >> 1); - break; - case R_390_PC16: - *(unsigned short *) reloc_addr = - value + reloc->r_addend - (Elf32_Addr) reloc_addr; - break; - case R_390_NONE: - break; -# endif -#endif -#if !defined(RTLD_BOOTSTRAP) || defined(_NDEBUG) - default: - /* We add these checks in the version to relocate ld.so only - if we are still debugging. */ - _dl_reloc_bad_type (map, r_type, 0); - break; -#endif - } - } -} - -auto inline void -__attribute__ ((always_inline)) -elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc, - void *const reloc_addr_arg) -{ - Elf32_Addr *const reloc_addr = reloc_addr_arg; - *reloc_addr = l_addr + reloc->r_addend; -} - -auto inline void -__attribute__ ((always_inline)) -elf_machine_lazy_rel (struct link_map *map, - Elf32_Addr l_addr, const Elf32_Rela *reloc, - int skip_ifunc) -{ - Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); - const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); - /* Check for unexpected PLT reloc type. */ - if (__glibc_likely (r_type == R_390_JMP_SLOT)) - { - if (__builtin_expect (map->l_mach.plt, 0) == 0) - *reloc_addr += l_addr; - else - *reloc_addr = map->l_mach.plt + (reloc - map->l_mach.jmprel) * 32; - } - else if (__glibc_likely (r_type == R_390_IRELATIVE)) - { - Elf32_Addr value = map->l_addr + reloc->r_addend; - if (__glibc_likely (!skip_ifunc)) - value = elf_ifunc_invoke (value); - *reloc_addr = value; - } - else - _dl_reloc_bad_type (map, r_type, 1); -} - -#endif /* RESOLVE_MAP */ |