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Diffstat (limited to 'REORG.TODO/sysdeps/s390/s390-64/dl-machine.h')
| -rw-r--r-- | REORG.TODO/sysdeps/s390/s390-64/dl-machine.h | 476 |
1 files changed, 476 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/s390/s390-64/dl-machine.h b/REORG.TODO/sysdeps/s390/s390-64/dl-machine.h new file mode 100644 index 0000000000..f2aeb1e78e --- /dev/null +++ b/REORG.TODO/sysdeps/s390/s390-64/dl-machine.h @@ -0,0 +1,476 @@ +/* Machine-dependent ELF dynamic relocation inline functions. + 64 bit S/390 Version. + Copyright (C) 2001-2017 Free Software Foundation, Inc. + Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). + 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 "s390x" + +#include <sys/param.h> +#include <string.h> +#include <link.h> +#include <sysdeps/s390/dl-procinfo.h> +#include <dl-irel.h> + +#define ELF_MACHINE_IRELATIVE R_390_IRELATIVE + +/* This is an older, now obsolete value. */ +#define EM_S390_OLD 0xA390 + +/* Return nonzero iff E_MACHINE is compatible with the running host. */ +static inline int +elf_machine_matches_host (const Elf64_Ehdr *ehdr) +{ + return (ehdr->e_machine == EM_S390 || ehdr->e_machine == EM_S390_OLD) + && ehdr->e_ident[EI_CLASS] == ELFCLASS64; +} + +/* 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 Elf64_Addr +elf_machine_dynamic (void) +{ + register Elf64_Addr *got; + + __asm__ ( " larl %0,_GLOBAL_OFFSET_TABLE_\n" + : "=&a" (got) : : "0" ); + + return *got; +} + +/* Return the run-time load address of the shared object. */ +static inline Elf64_Addr +elf_machine_load_address (void) +{ + Elf64_Addr addr; + + __asm__( " larl %0,_dl_start\n" + " larl 1,_GLOBAL_OFFSET_TABLE_\n" + " lghi 2,_dl_start@GOT\n" + " slg %0,0(2,1)" + : "=&d" (addr) : : "1", "2" ); + 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 (Elf64_Word); + extern void _dl_runtime_profile (Elf64_Word); +#if defined HAVE_S390_VX_ASM_SUPPORT + extern void _dl_runtime_resolve_vx (Elf64_Word); + extern void _dl_runtime_profile_vx (Elf64_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 .rela.plt section, push _GLOBAL_OFFSET_TABLE_[1], + and then jump to _GLOBAL_OFFSET_TABLE[2]. */ + Elf64_Addr *got; + got = (Elf64_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 + 0x2e. */ + if (got[1]) + { + l->l_mach.plt = got[1] + l->l_addr; + l->l_mach.jmprel = (const Elf64_Rela *) D_PTR (l, l_info[DT_JMPREL]); + } + got[1] = (Elf64_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] = (Elf64_Addr) &_dl_runtime_profile_vx; + else + got[2] = (Elf64_Addr) &_dl_runtime_profile; +#else + got[2] = (Elf64_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] = (Elf64_Addr) &_dl_runtime_resolve_vx; + else + got[2] = (Elf64_Addr) &_dl_runtime_resolve; +#else + got[2] = (Elf64_Addr) &_dl_runtime_resolve; +#endif + } + } + + return lazy; +} + +/* 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\ + lgr %r2,%r15\n\ + # Alloc stack frame\n\ + aghi %r15,-160\n\ + # Set the back chain to zero\n\ + xc 0(8,%r15),0(%r15)\n\ + # Call _dl_start with %r2 pointing to arg on stack\n\ + brasl %r14,_dl_start # call _dl_start\n\ +_dl_start_user:\n\ + # Save the user entry point address in %r8.\n\ + lgr %r8,%r2\n\ + # Point %r12 at the GOT.\n\ + larl %r12,_GLOBAL_OFFSET_TABLE_\n\ + # See if we were run as a command with the executable file\n\ + # name as an extra leading argument.\n\ + lghi %r1,_dl_skip_args@GOT\n\ + lg %r1,0(%r1,%r12)\n\ + lgf %r1,0(%r1) # load _dl_skip_args\n\ + # Get the original argument count.\n\ + lg %r0,160(%r15)\n\ + # Subtract _dl_skip_args from it.\n\ + sgr %r0,%r1\n\ + # Adjust the stack pointer to skip _dl_skip_args words.\n\ + sllg %r1,%r1,3\n\ + agr %r15,%r1\n\ + # Set the back chain to zero again\n\ + xc 0(8,%r15),0(%r15)\n\ + # Store back the modified argument count.\n\ + stg %r0,160(%r15)\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\ + lghi %r2,_rtld_local@GOT\n\ + lg %r2,0(%r2,%r12)\n\ + lg %r2,0(%r2)\n\ + lg %r3,160(%r15)\n\ + la %r4,168(%r15)\n\ + lgr %r5,%r3\n\ + sllg %r5,%r5,3\n\ + la %r5,176(%r5,%r15)\n\ + brasl %r14,_dl_init@PLT\n\ + # Pass our finalizer function to the user in %r14, as per ELF ABI.\n\ + lghi %r14,_dl_fini@GOT\n\ + lg %r14,0(%r14,%r12)\n\ + # Free stack frame\n\ + aghi %r15,160\n\ + # Jump to the user's entry point (saved in %r8).\n\ + br %r8\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 64 bit S/390 never uses Elf64_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 Elf64_Addr +elf_machine_fixup_plt (struct link_map *map, lookup_t t, + const Elf64_Rela *reloc, + Elf64_Addr *reloc_addr, Elf64_Addr value) +{ + return *reloc_addr = value; +} + +/* Return the final value of a plt relocation. */ +static inline Elf64_Addr +elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc, + Elf64_Addr value) +{ + return value; +} + +/* Names of the architecture-specific auditing callback functions. */ +#define ARCH_LA_PLTENTER s390_64_gnu_pltenter +#define ARCH_LA_PLTEXIT s390_64_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 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 int r_type = ELF64_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 Elf64_Sym *const refsym = sym; +#endif + struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); + Elf64_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 for 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_64: + *reloc_addr = value + reloc->r_addend; + break; + case R_390_32: + *(unsigned int *) 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_PC64: + *reloc_addr = value +reloc->r_addend - (Elf64_Addr) reloc_addr; + break; + case R_390_PC32DBL: + *(unsigned int *) reloc_addr = (unsigned int) + ((int) (value + reloc->r_addend - (Elf64_Addr) reloc_addr) >> 1); + break; + case R_390_PC32: + *(unsigned int *) reloc_addr = + value + reloc->r_addend - (Elf64_Addr) reloc_addr; + break; + case R_390_PC16DBL: + *(unsigned short *) reloc_addr = (unsigned short) + ((short) (value + reloc->r_addend - (Elf64_Addr) reloc_addr) >> 1); + break; + case R_390_PC16: + *(unsigned short *) reloc_addr = + value + reloc->r_addend - (Elf64_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 (Elf64_Addr l_addr, const Elf64_Rela *reloc, + void *const reloc_addr_arg) +{ + Elf64_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, + Elf64_Addr l_addr, const Elf64_Rela *reloc, + int skip_ifunc) +{ + Elf64_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); + const unsigned int r_type = ELF64_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)) + { + Elf64_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 */ |