/* Machine-dependent ELF dynamic relocation inline functions. Sparc64 version. Copyright (C) 1997, 1998, 1999, 2000 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; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #define ELF_MACHINE_NAME "sparc64" #include #include #include #include #define ELF64_R_TYPE_ID(info) ((info) & 0xff) #define ELF64_R_TYPE_DATA(info) ((info) >> 8) /* Return nonzero iff E_MACHINE is compatible with the running host. */ static inline int elf_machine_matches_host (Elf64_Half e_machine) { return e_machine == EM_SPARCV9; } /* 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 *elf_pic_register __asm__("%l7"); return *elf_pic_register; } /* Return the run-time load address of the shared object. */ static inline Elf64_Addr elf_machine_load_address (void) { register Elf64_Addr elf_pic_register __asm__("%l7"); Elf64_Addr pc, la; /* Utilize the fact that a local .got entry will be partially initialized at startup awaiting its RELATIVE fixup. */ __asm("sethi %%hi(.Load_address), %1\n" ".Load_address:\n\t" "rd %%pc, %0\n\t" "or %1, %%lo(.Load_address), %1\n\t" : "=r"(pc), "=r"(la)); return pc - *(Elf64_Addr *)(elf_pic_register + la); } /* We have 4 cases to handle. And we code different code sequences for each one. I love V9 code models... */ 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) { unsigned int *insns = (unsigned int *) reloc_addr; Elf64_Addr plt_vaddr = (Elf64_Addr) reloc_addr; /* Now move plt_vaddr up to the call instruction. */ plt_vaddr += (2 * 4); /* PLT entries .PLT32768 and above look always the same. */ if (__builtin_expect (reloc->r_addend, 0) != 0) { *reloc_addr = value - map->l_addr; } /* 32-bit Sparc style, the target is in the lower 32-bits of address space. */ else if ((value >> 32) == 0) { /* sethi %hi(target), %g1 jmpl %g1 + %lo(target), %g0 */ insns[2] = 0x81c06000 | (value & 0x3ff); __asm __volatile ("flush %0 + 8" : : "r" (insns)); insns[1] = 0x03000000 | ((unsigned int)(value >> 10)); __asm __volatile ("flush %0 + 4" : : "r" (insns)); } /* We can also get somewhat simple sequences if the distance between the target and the PLT entry is within +/- 2GB. */ else if ((plt_vaddr > value && ((plt_vaddr - value) >> 32) == 0) || (value > plt_vaddr && ((value - plt_vaddr) >> 32) == 0)) { unsigned int displacement; if (plt_vaddr > value) displacement = (0 - (plt_vaddr - value)); else displacement = value - plt_vaddr; /* mov %o7, %g1 call displacement mov %g1, %o7 */ insns[3] = 0x9e100001; __asm __volatile ("flush %0 + 12" : : "r" (insns)); insns[2] = 0x40000000 | (displacement >> 2); __asm __volatile ("flush %0 + 8" : : "r" (insns)); insns[1] = 0x8210000f; __asm __volatile ("flush %0 + 4" : : "r" (insns)); } /* Worst case, ho hum... */ else { unsigned int high32 = (value >> 32); unsigned int low32 = (unsigned int) value; /* ??? Some tricks can be stolen from the sparc64 egcs backend constant formation code I wrote. -DaveM */ /* sethi %hh(value), %g1 sethi %lm(value), %g5 or %g1, %hm(value), %g1 or %g5, %lo(value), %g5 sllx %g1, 32, %g1 jmpl %g1 + %g5, %g0 nop */ insns[6] = 0x81c04005; __asm __volatile ("flush %0 + 24" : : "r" (insns)); insns[5] = 0x83287020; __asm __volatile ("flush %0 + 20" : : "r" (insns)); insns[4] = 0x8a116000 | (low32 & 0x3ff); __asm __volatile ("flush %0 + 16" : : "r" (insns)); insns[3] = 0x82106000 | (high32 & 0x3ff); __asm __volatile ("flush %0 + 12" : : "r" (insns)); insns[2] = 0x0b000000 | (low32 >> 10); __asm __volatile ("flush %0 + 8" : : "r" (insns)); insns[1] = 0x03000000 | (high32 >> 10); __asm __volatile ("flush %0 + 4" : : "r" (insns)); } return 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 + reloc->r_addend; } #ifdef RESOLVE /* 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 Elf64_Rela *reloc, const Elf64_Sym *sym, const struct r_found_version *version, Elf64_Addr *const reloc_addr) { #ifndef RTLD_BOOTSTRAP /* 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 if (ELF64_R_TYPE_ID (reloc->r_info) == R_SPARC_RELATIVE) { #ifndef RTLD_BOOTSTRAP if (map != &_dl_rtld_map) /* Already done in rtld itself. */ #endif *reloc_addr = map->l_addr + reloc->r_addend; } else if (ELF64_R_TYPE_ID (reloc->r_info) != R_SPARC_NONE) /* Who is Wilbur? */ { const Elf64_Sym *const refsym = sym; Elf64_Addr value; if (sym->st_shndx != SHN_UNDEF && ELF64_ST_BIND (sym->st_info) == STB_LOCAL) value = map->l_addr; else { value = RESOLVE (&sym, version, ELF64_R_TYPE_ID (reloc->r_info)); if (sym) value += sym->st_value; } value += reloc->r_addend; /* Assume copy relocs have zero addend. */ switch (ELF64_R_TYPE_ID (reloc->r_info)) { case R_SPARC_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 || (_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_sysdep_error (_dl_argv[0] ?: "", ": Symbol `", strtab + refsym->st_name, "' has different size in shared object, " "consider re-linking\n", NULL); } memcpy (reloc_addr, (void *) value, MIN (sym->st_size, refsym->st_size)); break; case R_SPARC_64: case R_SPARC_GLOB_DAT: *reloc_addr = value; break; case R_SPARC_8: *(char *) reloc_addr = value; break; case R_SPARC_16: *(short *) reloc_addr = value; break; case R_SPARC_32: *(unsigned int *) reloc_addr = value; break; case R_SPARC_DISP8: *(char *) reloc_addr = (value - (Elf64_Addr) reloc_addr); break; case R_SPARC_DISP16: *(short *) reloc_addr = (value - (Elf64_Addr) reloc_addr); break; case R_SPARC_DISP32: *(unsigned int *) reloc_addr = (value - (Elf64_Addr) reloc_addr); break; case R_SPARC_WDISP30: *(unsigned int *) reloc_addr = ((*(unsigned int *)reloc_addr & 0xc0000000) | ((value - (Elf64_Addr) reloc_addr) >> 2)); break; /* MEDLOW code model relocs */ case R_SPARC_LO10: *(unsigned int *) reloc_addr = ((*(unsigned int *)reloc_addr & ~0x3ff) | (value & 0x3ff)); break; case R_SPARC_HI22: *(unsigned int *) reloc_addr = ((*(unsigned int *)reloc_addr & 0xffc00000) | (value >> 10)); break; case R_SPARC_OLO10: *(unsigned int *) reloc_addr = ((*(unsigned int *)reloc_addr & ~0x1fff) | (((value & 0x3ff) + ELF64_R_TYPE_DATA (reloc->r_info)) & 0x1fff)); break; /* MEDMID code model relocs */ case R_SPARC_H44: *(unsigned int *) reloc_addr = ((*(unsigned int *)reloc_addr & 0xffc00000) | (value >> 22)); break; case R_SPARC_M44: *(unsigned int *) reloc_addr = ((*(unsigned int *)reloc_addr & ~0x3ff) | ((value >> 12) & 0x3ff)); break; case R_SPARC_L44: *(unsigned int *) reloc_addr = ((*(unsigned int *)reloc_addr & ~0xfff) | (value & 0xfff)); break; /* MEDANY code model relocs */ case R_SPARC_HH22: *(unsigned int *) reloc_addr = ((*(unsigned int *)reloc_addr & 0xffc00000) | (value >> 42)); break; case R_SPARC_HM10: *(unsigned int *) reloc_addr = ((*(unsigned int *)reloc_addr & ~0x3ff) | ((value >> 32) & 0x3ff)); break; case R_SPARC_LM22: *(unsigned int *) reloc_addr = ((*(unsigned int *)reloc_addr & 0xffc00000) | ((value >> 10) & 0x003fffff)); break; case R_SPARC_JMP_SLOT: elf_machine_fixup_plt(map, NULL, reloc, reloc_addr, value); break; default: _dl_reloc_bad_type (map, ELFW(R_TYPE) (reloc->r_info), 0); break; } } } static inline void elf_machine_lazy_rel (struct link_map *map, Elf64_Addr l_addr, const Elf64_Rela *reloc) { switch (ELF64_R_TYPE (reloc->r_info)) { case R_SPARC_NONE: break; case R_SPARC_JMP_SLOT: break; default: _dl_reloc_bad_type (map, ELFW(R_TYPE) (reloc->r_info), 1); break; } } #endif /* RESOLVE */ /* Nonzero iff TYPE should not be allowed to resolve to one of the main executable's symbols, as for a COPY reloc. */ #define elf_machine_lookup_noexec_p(type) ((type) == R_SPARC_COPY) /* Nonzero iff TYPE describes relocation of a PLT entry, so PLT entries should not be allowed to define the value. */ #define elf_machine_lookup_noplt_p(type) ((type) == R_SPARC_JMP_SLOT) /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ #define ELF_MACHINE_JMP_SLOT R_SPARC_JMP_SLOT /* The SPARC never uses Elf64_Rel relocations. */ #define ELF_MACHINE_NO_REL 1 /* The SPARC overlaps DT_RELA and DT_PLTREL. */ #define ELF_MACHINE_PLTREL_OVERLAP 1 /* 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 elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) { if (l->l_info[DT_JMPREL] && lazy) { extern void _dl_runtime_resolve_0 (void); extern void _dl_runtime_resolve_1 (void); extern void _dl_runtime_profile_0 (void); extern void _dl_runtime_profile_1 (void); Elf64_Addr res0_addr, res1_addr; unsigned int *plt = (void *) D_PTR (l, l_info[DT_PLTGOT]); if (! profile) { res0_addr = (Elf64_Addr) &_dl_runtime_resolve_0; res1_addr = (Elf64_Addr) &_dl_runtime_resolve_1; } else { res0_addr = (Elf64_Addr) &_dl_runtime_profile_0; res1_addr = (Elf64_Addr) &_dl_runtime_profile_1; if (_dl_name_match_p (_dl_profile, l)) _dl_profile_map = l; } /* PLT0 looks like: save %sp, -192, %sp sethi %hh(_dl_runtime_{resolve,profile}_0), %l0 sethi %lm(_dl_runtime_{resolve,profile}_0), %l1 or %l0, %hm(_dl_runtime_{resolve,profile}_0), %l0 or %l1, %lo(_dl_runtime_{resolve,profile}_0), %l1 sllx %l0, 32, %l0 jmpl %l0 + %l1, %l6 sethi %hi(0xffc00), %l2 */ plt[0] = 0x9de3bf40; plt[1] = 0x21000000 | (res0_addr >> (64 - 22)); plt[2] = 0x23000000 | ((res0_addr >> 10) & 0x003fffff); plt[3] = 0xa0142000 | ((res0_addr >> 32) & 0x3ff); plt[4] = 0xa2146000 | (res0_addr & 0x3ff); plt[5] = 0xa12c3020; plt[6] = 0xadc40011; plt[7] = 0x250003ff; /* PLT1 looks like: save %sp, -192, %sp sethi %hh(_dl_runtime_{resolve,profile}_1), %l0 sethi %lm(_dl_runtime_{resolve,profile}_1), %l1 or %l0, %hm(_dl_runtime_{resolve,profile}_1), %l0 or %l1, %lo(_dl_runtime_{resolve,profile}_1), %l1 sllx %l0, 32, %l0 jmpl %l0 + %l1, %l6 srlx %g1, 12, %o1 */ plt[8 + 0] = 0x9de3bf40; plt[8 + 1] = 0x21000000 | (res1_addr >> (64 - 22)); plt[8 + 2] = 0x23000000 | ((res1_addr >> 10) & 0x003fffff); plt[8 + 3] = 0xa0142000 | ((res1_addr >> 32) & 0x3ff); plt[8 + 4] = 0xa2146000 | (res1_addr & 0x3ff); plt[8 + 5] = 0xa12c3020; plt[8 + 6] = 0xadc40011; plt[8 + 7] = 0x9330700c; /* Now put the magic cookie at the beginning of .PLT3 Entry .PLT4 is unused by this implementation. */ *((struct link_map **)(&plt[16 + 0])) = l; } return lazy; } /* This code is used in dl-runtime.c to call the `fixup' function and then redirect to the address it returns. */ #define TRAMPOLINE_TEMPLATE(tramp_name, fixup_name) \ asm ("\ .text .globl " #tramp_name "_0 .type " #tramp_name "_0, @function .align 32 " #tramp_name "_0: ! sethi %hi(1047552), %l2 - Done in .PLT0 ldx [%l6 + 32 + 8], %o0 sub %g1, %l6, %l0 xor %l2, -1016, %l2 sethi %hi(5120), %l3 add %l0, %l2, %l0 sethi %hi(32768), %l4 udivx %l0, %l3, %l3 sllx %l3, 2, %l1 add %l1, %l3, %l1 sllx %l1, 10, %l2 sllx %l1, 5, %l1 sub %l0, %l2, %l0 udivx %l0, 24, %l0 add %l0, %l4, %l0 add %l1, %l0, %l1 add %l1, %l1, %l0 add %l0, %l1, %l0 mov %i7, %o2 call " #fixup_name " sllx %l0, 3, %o1 jmp %o0 restore .size " #tramp_name "_0, . - " #tramp_name "_0 .globl " #tramp_name "_1 .type " #tramp_name "_1, @function .align 32 " #tramp_name "_1: ! srlx %g1, 12, %o1 - Done in .PLT1 ldx [%l6 + 8], %o0 add %o1, %o1, %o3 mov %i7, %o2 call " #fixup_name " add %o1, %o3, %o1 jmp %o0 restore .size " #tramp_name "_1, . - " #tramp_name "_1 .previous"); #ifndef PROF #define ELF_MACHINE_RUNTIME_TRAMPOLINE \ TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup); \ TRAMPOLINE_TEMPLATE (_dl_runtime_profile, profile_fixup); #else #define ELF_MACHINE_RUNTIME_TRAMPOLINE \ TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup); \ TRAMPOLINE_TEMPLATE (_dl_runtime_profile, fixup); #endif /* The PLT uses Elf64_Rela relocs. */ #define elf_machine_relplt elf_machine_rela /* 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 __S1(x) #x #define __S(x) __S1(x) #define RTLD_START __asm__ ( "\ .text .global _start .type _start, @function .align 32 _start: /* Make room for functions to drop their arguments on the stack. */ sub %sp, 6*8, %sp /* Pass pointer to argument block to _dl_start. */ call _dl_start add %sp," __S(STACK_BIAS) "+22*8,%o0 /* FALLTHRU */ .size _start, .-_start .global _dl_start_user .type _dl_start_user, @function _dl_start_user: /* Load the GOT register. */ 1: call 11f sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)),%l7 11: or %l7,%lo(_GLOBAL_OFFSET_TABLE_-(1b-.)),%l7 add %l7,%o7,%l7 /* Save the user entry point address in %l0. */ mov %o0,%l0 /* Store the highest stack address. */ sethi %hi(__libc_stack_end), %g5 or %g5, %lo(__libc_stack_end), %g5 ldx [%l7 + %g5], %l1 add %sp, 6*8, %l2 stx %l2, [%l1] /* See if we were run as a command with the executable file name as an extra leading argument. If so, we must shift things around since we must keep the stack doubleword aligned. */ sethi %hi(_dl_skip_args), %g5 or %g5, %lo(_dl_skip_args), %g5 ldx [%l7+%g5], %i0 ld [%i0], %i0 brz,pt %i0, 2f ldx [%sp+" __S(STACK_BIAS) "+22*8], %i5 /* Find out how far to shift. */ sub %i5, %i0, %i5 sllx %i0, 3, %i2 stx %i5, [%sp+" __S(STACK_BIAS) "+22*8] add %sp, " __S(STACK_BIAS) "+23*8, %i1 add %i1, %i2, %i2 /* Copy down argv. */ 12: ldx [%i2], %i3 add %i2, 8, %i2 stx %i3, [%i1] brnz,pt %i3, 12b add %i1, 8, %i1 /* Copy down envp. */ 13: ldx [%i2], %i3 add %i2, 8, %i2 stx %i3, [%i1] brnz,pt %i3, 13b add %i1, 8, %i1 /* Copy down auxiliary table. */ 14: ldx [%i2], %i3 ldx [%i2+8], %i4 add %i2, 16, %i2 stx %i3, [%i1] stx %i4, [%i1+8] brnz,pt %i3, 13b add %i1, 16, %i1 /* %o0 = _dl_loaded, %o1 = argc, %o2 = argv, %o3 = envp. */ 2: sethi %hi(_dl_loaded), %o0 add %sp, " __S(STACK_BIAS) "+23*8, %o2 orcc %o0, %lo(_dl_loaded), %o0 sllx %i5, 3, %o3 ldx [%l7+%o0], %o0 add %o3, 8, %o3 mov %i5, %o1 add %o2, %o3, %o3 call _dl_init ldx [%o0], %o0 /* Pass our finalizer function to the user in %g1. */ sethi %hi(_dl_fini), %g1 or %g1, %lo(_dl_fini), %g1 ldx [%l7+%g1], %g1 /* Jump to the user's entry point and deallocate the extra stack we got. */ jmp %l0 add %sp, 6*8, %sp .size _dl_start_user, . - _dl_start_user .previous");