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Diffstat (limited to 'ports/sysdeps/am33/dl-machine.h')
| -rw-r--r-- | ports/sysdeps/am33/dl-machine.h | 478 |
1 files changed, 0 insertions, 478 deletions
diff --git a/ports/sysdeps/am33/dl-machine.h b/ports/sysdeps/am33/dl-machine.h deleted file mode 100644 index 10e6e4662b..0000000000 --- a/ports/sysdeps/am33/dl-machine.h +++ /dev/null @@ -1,478 +0,0 @@ -/* Machine-dependent ELF dynamic relocation inline functions. AM33 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 Library General Public License as - published by the Free Software Foundation; either version 2 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 - Library General Public License for more details. - - You should have received a copy of the GNU Library 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 "mn10300" - -#include <sys/param.h> - -/* Return nonzero iff ELF header is compatible with the running host. */ -static inline int __attribute__ ((unused)) -elf_machine_matches_host (const Elf32_Ehdr *ehdr) -{ - return ehdr->e_machine == EM_MN10300; -} - - -/* 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 __attribute__ ((unused)) -elf_machine_dynamic (void) -{ - register Elf32_Addr *got asm ("a2"); - return *got; -} - - -/* Return the run-time load address of the shared object. */ -static inline Elf32_Addr __attribute__ ((unused)) -elf_machine_load_address (void) -{ - register Elf32_Addr gotaddr asm ("a2"); - Elf32_Addr off, gotval; - - asm ("mov _dl_start@GOTOFF,%0" : "=r" (off)); - asm ("mov (_dl_start@GOT,%1),%0" : "=r" (gotval) : "r" (gotaddr)); - - return off + gotaddr - gotval; -} - -#ifndef PROF -/* We add a declaration of this function here so that in dl-runtime.c - the ELF_MACHINE_RUNTIME_TRAMPOLINE macro really can pass the parameters - in registers. - - We cannot use this scheme for profiling because the _mcount call - destroys the passed register information. */ -static ElfW(Addr) fixup (struct link_map *l, ElfW(Word) reloc_offset) - __attribute__ ((unused)); -static ElfW(Addr) profile_fixup (struct link_map *l, ElfW(Word) reloc_offset, - ElfW(Addr) retaddr) - __attribute__ ((unused)); -#endif - -/* 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) -{ - Elf32_Addr *got; - extern void _dl_runtime_resolve (Elf32_Word) attribute_hidden; - extern void _dl_runtime_profile (Elf32_Word) attribute_hidden; - - 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]. */ - got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]); - 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 (__builtin_expect (profile, 0)) - { - got[2] = (Elf32_Addr) &_dl_runtime_profile; - - if (_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. */ - got[2] = (Elf32_Addr) &_dl_runtime_resolve; - } - - return lazy; -} - -/* This code is used in dl-runtime.c to call the `fixup' function - and then redirect to the address it returns. */ -#ifndef PROF -# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\ - .text\n\ - .globl _dl_runtime_resolve\n\ - .type _dl_runtime_resolve, @function\n\ -_dl_runtime_resolve:\n\ - add -12,sp # Preserve registers otherwise clobbered.\n\ - mov d1,(20,sp)\n\ - mov d0,(16,sp)\n\ - mov r1,d0\n\ - mov r0,d1\n\ - call fixup,[],0 # Call resolver.\n\ - mov d0,a0\n\ - mov (12,sp),d1 # Copy return address back to mdr,\n\ - mov d1,mdr # in case the callee returns with retf\n\ - mov (16,sp),d0 # Get register content back.\n\ - mov (20,sp),d1\n\ - add 12,sp\n\ - jmp (a0)\n\ - .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\ -\n\ - .globl _dl_runtime_profile\n\ - .type _dl_runtime_profile, @function\n\ -_dl_runtime_profile:\n\ - add -12,sp # Preserve registers otherwise clobbered.\n\ - mov d1,(20,sp)\n\ - mov d0,(16,sp)\n\ - mov r1,d0\n\ - mov r0,d1\n\ - call profile_fixup,[],0 # Call resolver.\n\ - mov d0,a0\n\ - mov (12,sp),d1 # Copy return address back to mdr,\n\ - mov d1,mdr # in case the callee returns with retf\n\ - mov (16,sp),d0 # Get register content back.\n\ - mov (20,sp),d1\n\ - add 12,sp\n\ - jmp (a0)\n\ - .size _dl_runtime_profile, .-_dl_runtime_profile\n\ - .previous\n\ -"); -#else -# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\n\ - .text\n\ - .globl _dl_runtime_resolve\n\ - .globl _dl_runtime_profile\n\ - .type _dl_runtime_resolve, @function\n\ - .type _dl_runtime_profile, @function\n\ -_dl_runtime_resolve:\n\ -_dl_runtime_profile:\n\ - add -12,sp # Preserve registers otherwise clobbered.\n\ - mov d1,(20,sp)\n\ - mov d0,(16,sp)\n\ - mov r1,d0\n\ - mov r0,d1\n\ - call profile_fixup,[],0 # Call resolver.\n\ - mov d0,a0\n\ - mov (12,sp),d1 # Copy return address back to mdr,\n\ - mov d1,mdr # in case the callee returns with retf\n\ - mov (16,sp),d0 # Get register content back.\n\ - mov (20,sp),d1\n\ - add 12,sp\n\ - jmp (a0)\n\ - .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\ - .size _dl_runtime_profile, .-_dl_runtime_profile\n\ - .previous\n\ -"); -#endif - -/* 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\ -.globl _start\n\ -.globl _dl_start_user\n\ -_start:\n\ - mov 0,a3 # Mark the top of the stack\n\ - mov sp,a1\n\ - add -20,sp # Prepare for function call\n\ - mov a1,d0\n\ - call _dl_start,[],0\n\ -_dl_start_user:\n\ - # Save the user entry point address in d2.\n\ - mov d0,d2\n\ - # Point a2 at the GOT.\n\ -0: mov pc,a2\n\ - add _GLOBAL_OFFSET_TABLE_ - (0b-.),a2\n\ - # Store the highest stack address\n\ - mov (__libc_stack_end@GOT,a2),a0\n\ - mov a1,(a0)\n\ - # See if we were run as a command with the executable file\n\ - # name as an extra leading argument.\n\ - mov (_dl_skip_args@GOT,a2),a0\n\ - mov (a0),d0\n\ - # Pop the original argument count.\n\ - mov (20,sp),d3\n\ - # Subtract _dl_skip_args from it.\n\ - sub d0,d3\n\ - # Adjust the stack pointer to skip _dl_skip_args words.\n\ - asl2 d0\n\ - mov sp,a0\n\ - add d0,a0\n\ - mov a0,sp\n\ - # Push argc back on the stack.\n\ - mov d3,(20,sp)\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\ - # Load the parameters again.\n\ - # (d0, d1, (12,sp), (16,sp)) = (_dl_loaded, argc, argv, envp)\n\ - add 24,a0\n\ - mov a0,(12,sp) # a0 is 24+sp\n\ - mov d3,d1 # d3 contained argc\n\ - inc d3\n\ - asl2 d3 # d3 is now (argc+1)*4,\n\ - add d3,a0 # the offset between argv and envp\n\ - mov a0,(16,sp)\n\ - mov (_rtld_local@GOTOFF,a2),d0\n\ - # Call the function to run the initializers.\n\ - call _dl_init@PLT,[],0\n\ - # Pass our finalizer function to the user in d0, as per ELF ABI.\n\ - mov (_dl_fini@GOT,a2),d0\n\ - add 20,sp\n\ - # Jump to the user's entry point.\n\ - mov d2,a1\n\ - jmp (a1)\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, so - PLT entries 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. */ -#define elf_machine_type_class(type) \ - ((((type) == R_MN10300_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \ - | (((type) == R_MN10300_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_MN10300_JMP_SLOT - -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 + reloc->r_addend; -} - -#endif /* !dl_machine_h */ - -#ifdef RESOLVE - -/* The mn10300 never uses Elf32_Rel relocations. */ -#define ELF_MACHINE_NO_REL 1 - -/* Perform the relocation specified by RELOC and SYM (which is fully resolved). - MAP is the object containing the reloc. */ - -static inline void -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) -{ - const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); - Elf32_Addr value, *reloc_addr; - - /* Make sure we drop any previous alignment assumptions. */ - asm ("" : "=r" (reloc_addr) : "0" (reloc_addr_arg)); - -#define COPY_UNALIGNED_WORD(sw, tw, align) \ - { \ - unsigned long *__sl = (void*)&(sw), *__tl = (void*)&(tw); \ - unsigned short *__ss = (void*)&(sw), *__ts = (void*)&(tw); \ - unsigned char *__sc = (void*)&(sw), *__tc = (void*)&(tw); \ - switch ((align)) \ - { \ - case 0: \ - *__tl = *__sl; \ - break; \ - case 2: \ - *__ts++ = *__ss++; \ - *__ts = *__ss; \ - break; \ - default: \ - *__tc++ = *__sc++; \ - *__tc++ = *__sc++; \ - *__tc++ = *__sc++; \ - *__tc = *__sc; \ - break; \ - } \ - } - -#define COPY_UNALIGNED_HALFWORD(sw, tw, align) \ - { \ - unsigned short *__ss = (void*)&(sw), *__ts = (void*)&(tw); \ - unsigned char *__sc = (void*)&(sw), *__tc = (void*)&(tw); \ - switch ((align)) \ - { \ - case 0: \ - *__ts = *__ss; \ - break; \ - default: \ - *__tc++ = *__sc++; \ - *__tc = *__sc; \ - break; \ - } \ - } - -#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC - if (__builtin_expect (r_type == R_MN10300_RELATIVE, 0)) - { -# 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. */ - weak_extern (_dl_rtld_map); - if (map != &_dl_rtld_map) /* Already done in rtld itself. */ -# endif - { - COPY_UNALIGNED_WORD (*reloc_addr, value, (int) reloc_addr & 3); - value += map->l_addr; - COPY_UNALIGNED_WORD (value, *reloc_addr, (int) reloc_addr & 3); - } - } -# ifndef RTLD_BOOTSTRAP - else if (__builtin_expect (r_type == R_MN10300_NONE, 0)) - return; -# endif - else -#endif - { -#ifndef RTLD_BOOTSTRAP - const Elf32_Sym *const refsym = sym; -#endif - - value = RESOLVE (&sym, version, ELF32_R_TYPE (reloc->r_info)); - if (sym) - value += sym->st_value; - value += reloc->r_addend; /* Assume copy relocs have zero addend. */ - - switch (r_type) - { -#ifndef RTLD_BOOTSTRAP - case R_MN10300_COPY: - if (sym == NULL) - /* This can happen in trace mode if an object could not be - found. */ - break; - if (sym->st_size > refsym->st_size - || (GLRO(dl_verbose) && sym->st_size < refsym->st_size)) - { - extern char **_dl_argv; - const char *strtab; - - strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); - _dl_error_printf ("\ -%s: Symbol `%s' has different size in shared object, consider re-linking\n", - _dl_argv[0] ?: "<program name unknown>", - strtab + refsym->st_name); - } - memcpy (reloc_addr, (void *) value, MIN (sym->st_size, - refsym->st_size)); - break; -#endif - case R_MN10300_GLOB_DAT: - case R_MN10300_JMP_SLOT: - /* These addresses are always aligned. */ - *reloc_addr = value; - break; - case R_MN10300_32: - COPY_UNALIGNED_WORD (value, *reloc_addr, (int) reloc_addr & 3); - break; -#ifndef RTLD_BOOTSTRAP - case R_MN10300_16: - COPY_UNALIGNED_HALFWORD (value, *reloc_addr, (int) reloc_addr & 1); - break; - case R_MN10300_8: - *(char *) reloc_addr = value; - break; - case R_MN10300_PCREL32: - value -= (Elf32_Addr) reloc_addr; - COPY_UNALIGNED_WORD (value, *reloc_addr, (int) reloc_addr & 3); - break; - case R_MN10300_PCREL16: - value -= (Elf32_Addr) reloc_addr; - COPY_UNALIGNED_HALFWORD (value, *reloc_addr, (int) reloc_addr & 1); - break; - case R_MN10300_PCREL8: - value -= (Elf32_Addr) reloc_addr; - *(char *) reloc_addr = (value - (Elf32_Addr) reloc_addr); - break; -#endif - case R_MN10300_NONE: /* Alright, Wilbur. */ - break; -#if !defined RTLD_BOOTSTRAP || defined _NDEBUG - default: - _dl_reloc_bad_type (map, ELFW(R_TYPE) (reloc->r_info), 0); - break; -#endif - } - - } -} - -static inline void -elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc, - void *const reloc_addr_arg) -{ - Elf32_Addr value, *reloc_addr; - - asm ("" : "=r" (reloc_addr) : "0" (reloc_addr_arg)); - - COPY_UNALIGNED_WORD (*reloc_addr, value, (int)reloc_addr & 3); - value += l_addr; - COPY_UNALIGNED_WORD (value, *reloc_addr, (int)reloc_addr & 3); -} - -static inline void -elf_machine_lazy_rel (struct link_map *map, - Elf32_Addr l_addr, const Elf32_Rela *reloc, - int skip_ifunc) -{ - unsigned long int const r_type = ELF32_R_TYPE (reloc->r_info); - - /* Check for unexpected PLT reloc type. */ - if (__builtin_expect (r_type, R_MN10300_JMP_SLOT) == R_MN10300_JMP_SLOT) - { - Elf32_Addr* const reloc_addr = (void *)(l_addr + reloc->r_offset); - Elf32_Addr value; - - /* Perform a RELATIVE reloc on the .got entry that transfers - to the .plt. */ - COPY_UNALIGNED_WORD (*reloc_addr, value, (int)reloc_addr & 3); - value += l_addr; - COPY_UNALIGNED_WORD (value, *reloc_addr, (int)reloc_addr & 3); - } - else if (__builtin_expect (r_type, R_MN10300_NONE) != R_MN10300_NONE) - _dl_reloc_bad_type (map, ELFW(R_TYPE) (reloc->r_info), 1); - -} - -#endif /* RESOLVE */ |