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Diffstat (limited to 'ports/sysdeps/am33/dl-machine.h')
| -rw-r--r-- | ports/sysdeps/am33/dl-machine.h | 481 |
1 files changed, 481 insertions, 0 deletions
diff --git a/ports/sysdeps/am33/dl-machine.h b/ports/sysdeps/am33/dl-machine.h new file mode 100644 index 0000000000..52278c0a4e --- /dev/null +++ b/ports/sysdeps/am33/dl-machine.h @@ -0,0 +1,481 @@ +/* Machine-dependent ELF dynamic relocation inline functions. AM33 version. + Copyright (C) 1995,96,97,98,99,2000,2001, 2004, 2011 + 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; +} + +#if !defined PROF && !__BOUNDED_POINTERS__ +/* 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. */ +/* GKM FIXME: Fix trampoline to pass bounds so we can do + without the `__unbounded' qualifier. */ +static ElfW(Addr) fixup (struct link_map *__unbounded 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. */ +#if !defined PROF && !__BOUNDED_POINTERS__ +# 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 */ |