aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/sparc/sparc32/dl-machine.h
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/sparc/sparc32/dl-machine.h')
-rw-r--r--sysdeps/sparc/sparc32/dl-machine.h568
1 files changed, 0 insertions, 568 deletions
diff --git a/sysdeps/sparc/sparc32/dl-machine.h b/sysdeps/sparc/sparc32/dl-machine.h
deleted file mode 100644
index 95f673270e..0000000000
--- a/sysdeps/sparc/sparc32/dl-machine.h
+++ /dev/null
@@ -1,568 +0,0 @@
-/* Machine-dependent ELF dynamic relocation inline functions. SPARC version.
- Copyright (C) 1996-2017 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 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 "sparc"
-
-#include <string.h>
-#include <sys/param.h>
-#include <ldsodefs.h>
-#include <sysdep.h>
-#include <tls.h>
-#include <dl-plt.h>
-#include <elf/dl-hwcaps.h>
-
-/* Return nonzero iff ELF header is compatible with the running host. */
-static inline int
-elf_machine_matches_host (const Elf32_Ehdr *ehdr)
-{
- if (ehdr->e_machine == EM_SPARC)
- return 1;
- else if (ehdr->e_machine == EM_SPARC32PLUS)
- {
-#if HAVE_TUNABLES || defined SHARED
- uint64_t hwcap_mask = GET_HWCAP_MASK();
- return GLRO(dl_hwcap) & hwcap_mask & HWCAP_SPARC_V9;
-#else
- return GLRO(dl_hwcap) & HWCAP_SPARC_V9;
-#endif
- }
- else
- return 0;
-}
-
-/* We have to do this because elf_machine_{dynamic,load_address} can be
- invoked from functions that have no GOT references, and thus the compiler
- has no obligation to load the PIC register. */
-#define LOAD_PIC_REG(PIC_REG) \
-do { register Elf32_Addr pc __asm("o7"); \
- __asm("sethi %%hi(_GLOBAL_OFFSET_TABLE_-4), %1\n\t" \
- "call 1f\n\t" \
- "add %1, %%lo(_GLOBAL_OFFSET_TABLE_+4), %1\n" \
- "1:\tadd %1, %0, %1" \
- : "=r" (pc), "=r" (PIC_REG)); \
-} while (0)
-
-/* 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 ("%l7");
-
- LOAD_PIC_REG (got);
-
- return *got;
-}
-
-/* Return the run-time load address of the shared object. */
-static inline Elf32_Addr
-elf_machine_load_address (void)
-{
- register Elf32_Addr *pc __asm ("%o7"), *got __asm ("%l7");
-
- __asm ("sethi %%hi(_GLOBAL_OFFSET_TABLE_-4), %1\n\t"
- "call 1f\n\t"
- " add %1, %%lo(_GLOBAL_OFFSET_TABLE_+4), %1\n\t"
- "call _DYNAMIC\n\t"
- "call _GLOBAL_OFFSET_TABLE_\n"
- "1:\tadd %1, %0, %1\n\t" : "=r" (pc), "=r" (got));
-
- /* got is now l_addr + _GLOBAL_OFFSET_TABLE_
- *got is _DYNAMIC
- pc[2]*4 is l_addr + _DYNAMIC - (long)pc - 8
- pc[3]*4 is l_addr + _GLOBAL_OFFSET_TABLE_ - (long)pc - 12 */
- return (Elf32_Addr) got - *got + (pc[2] - pc[3]) * 4 - 4;
-}
-
-/* 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)
-{
- Elf32_Addr *plt;
- extern void _dl_runtime_resolve (Elf32_Word);
- extern void _dl_runtime_profile (Elf32_Word);
-
- if (l->l_info[DT_JMPREL] && lazy)
- {
- Elf32_Addr rfunc;
-
- /* The entries for functions in the PLT have not yet been filled in.
- Their initial contents will arrange when called to set the high 22
- bits of %g1 with an offset into the .rela.plt section and jump to
- the beginning of the PLT. */
- plt = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]);
- if (__builtin_expect(profile, 0))
- {
- rfunc = (Elf32_Addr) &_dl_runtime_profile;
-
- if (GLRO(dl_profile) != NULL
- && _dl_name_match_p (GLRO(dl_profile), l))
- GL(dl_profile_map) = l;
- }
- else
- {
- rfunc = (Elf32_Addr) &_dl_runtime_resolve;
- }
-
- /* The beginning of the PLT does:
-
- sethi %hi(_dl_runtime_{resolve,profile}), %g2
- pltpc: jmpl %g2 + %lo(_dl_runtime_{resolve,profile}), %g2
- nop
- .word MAP
-
- The PC value (pltpc) saved in %g2 by the jmpl points near the
- location where we store the link_map pointer for this object. */
-
- plt[0] = 0x05000000 | ((rfunc >> 10) & 0x003fffff);
- plt[1] = 0x85c0a000 | (rfunc & 0x3ff);
- plt[2] = OPCODE_NOP; /* Fill call delay slot. */
- plt[3] = (Elf32_Addr) l;
- if (__builtin_expect (l->l_info[VALIDX(DT_GNU_PRELINKED)] != NULL, 0)
- || __builtin_expect (l->l_info [VALIDX (DT_GNU_LIBLISTSZ)] != NULL, 0))
- {
- /* Need to reinitialize .plt to undo prelinking. */
- Elf32_Rela *rela = (Elf32_Rela *) D_PTR (l, l_info[DT_JMPREL]);
- Elf32_Rela *relaend
- = (Elf32_Rela *) ((char *) rela
- + l->l_info[DT_PLTRELSZ]->d_un.d_val);
-#if !defined RTLD_BOOTSTRAP && !defined __sparc_v9__
- /* Note that we don't mask the hwcap here, as the flush is
- essential to functionality on those cpu's that implement it.
- For sparcv9 we can assume flush is present. */
- const int do_flush = GLRO(dl_hwcap) & HWCAP_SPARC_FLUSH;
-#else
- const int do_flush = 1;
-#endif
-
- /* prelink must ensure there are no R_SPARC_NONE relocs left
- in .rela.plt. */
- while (rela < relaend)
- {
- *(unsigned int *) (rela->r_offset + l->l_addr)
- = OPCODE_SETHI_G1 | (rela->r_offset + l->l_addr
- - (Elf32_Addr) plt);
- *(unsigned int *) (rela->r_offset + l->l_addr + 4)
- = OPCODE_BA | ((((Elf32_Addr) plt
- - rela->r_offset - l->l_addr - 4) >> 2)
- & 0x3fffff);
- if (do_flush)
- {
- __asm __volatile ("flush %0" : : "r" (rela->r_offset
- + l->l_addr));
- __asm __volatile ("flush %0+4" : : "r" (rela->r_offset
- + l->l_addr));
- }
- ++rela;
- }
- }
- }
-
- return lazy;
-}
-
-/* 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_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_SPARC_JMP_SLOT \
- || ((type) >= R_SPARC_TLS_GD_HI22 && (type) <= R_SPARC_TLS_TPOFF64)) \
- * ELF_RTYPE_CLASS_PLT) \
- | (((type) == R_SPARC_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_SPARC_JMP_SLOT
-
-/* The SPARC never uses Elf32_Rel relocations. */
-#define ELF_MACHINE_NO_REL 1
-#define ELF_MACHINE_NO_RELA 0
-
-/* Undo the sub %sp, 6*4, %sp; add %sp, 22*4, %o0 below to get at the
- value we want in __libc_stack_end. */
-#define DL_STACK_END(cookie) \
- ((void *) (((long) (cookie)) - (22 - 6) * 4))
-
-/* 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_GOT_ADDRESS(pic_reg, reg, symbol) \
- "sethi %gdop_hix22(" #symbol "), " #reg "\n\t" \
- "xor " #reg ", %gdop_lox10(" #symbol "), " #reg "\n\t" \
- "ld [" #pic_reg " + " #reg "], " #reg ", %gdop(" #symbol ")"
-
-#define RTLD_START __asm__ ("\
- .text\n\
- .globl _start\n\
- .type _start, @function\n\
- .align 32\n\
-_start:\n\
- /* Allocate space for functions to drop their arguments. */\n\
- sub %sp, 6*4, %sp\n\
- /* Pass pointer to argument block to _dl_start. */\n\
- call _dl_start\n\
- add %sp, 22*4, %o0\n\
- /* FALTHRU */\n\
- .globl _dl_start_user\n\
- .type _dl_start_user, @function\n\
-_dl_start_user:\n\
- /* Load the PIC register. */\n\
-1: call 2f\n\
- sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7\n\
-2: or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7\n\
- add %l7, %o7, %l7\n\
- /* Save the user entry point address in %l0 */\n\
- mov %o0, %l0\n\
- /* See if we were run as a command with the executable file name as an\n\
- extra leading argument. If so, adjust the contents of the stack. */\n\
- " RTLD_GOT_ADDRESS(%l7, %g2, _dl_skip_args) "\n\
- ld [%g2], %i0\n\
- tst %i0\n\
- beq 3f\n\
- ld [%sp+22*4], %i5 /* load argc */\n\
- /* Find out how far to shift. */\n\
- " RTLD_GOT_ADDRESS(%l7, %l3, _dl_argv) "\n\
- sub %i5, %i0, %i5\n\
- ld [%l3], %l4\n\
- sll %i0, 2, %i2\n\
- st %i5, [%sp+22*4]\n\
- sub %l4, %i2, %l4\n\
- add %sp, 23*4, %i1\n\
- add %i1, %i2, %i2\n\
- st %l4, [%l3]\n\
- /* Copy down argv */\n\
-21: ld [%i2], %i3\n\
- add %i2, 4, %i2\n\
- tst %i3\n\
- st %i3, [%i1]\n\
- bne 21b\n\
- add %i1, 4, %i1\n\
- /* Copy down env */\n\
-22: ld [%i2], %i3\n\
- add %i2, 4, %i2\n\
- tst %i3\n\
- st %i3, [%i1]\n\
- bne 22b\n\
- add %i1, 4, %i1\n\
- /* Copy down auxiliary table. */\n\
-23: ld [%i2], %i3\n\
- ld [%i2+4], %i4\n\
- add %i2, 8, %i2\n\
- tst %i3\n\
- st %i3, [%i1]\n\
- st %i4, [%i1+4]\n\
- bne 23b\n\
- add %i1, 8, %i1\n\
- /* %o0 = _dl_loaded, %o1 = argc, %o2 = argv, %o3 = envp. */\n\
-3: " RTLD_GOT_ADDRESS(%l7, %o0, _rtld_local) "\n\
- add %sp, 23*4, %o2\n\
- sll %i5, 2, %o3\n\
- add %o3, 4, %o3\n\
- mov %i5, %o1\n\
- add %o2, %o3, %o3\n\
- call _dl_init\n\
- ld [%o0], %o0\n\
- /* Pass our finalizer function to the user in %g1. */\n\
- " RTLD_GOT_ADDRESS(%l7, %g1, _dl_fini) "\n\
- /* Jump to the user's entry point and deallocate the extra stack we got. */\n\
- jmp %l0\n\
- add %sp, 6*4, %sp\n\
- .size _dl_start_user, . - _dl_start_user\n\
- .previous");
-
-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)
-{
-#ifdef __sparc_v9__
- /* Sparc v9 can assume flush is always present. */
- const int do_flush = 1;
-#else
- /* Note that we don't mask the hwcap here, as the flush is essential to
- functionality on those cpu's that implement it. */
- const int do_flush = GLRO(dl_hwcap) & HWCAP_SPARC_FLUSH;
-#endif
- return sparc_fixup_plt (reloc, reloc_addr, value, 1, do_flush);
-}
-
-/* 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 */
-
-#define ARCH_LA_PLTENTER sparc32_gnu_pltenter
-#define ARCH_LA_PLTEXIT sparc32_gnu_pltexit
-
-#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;
-#if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP
- const Elf32_Sym *const refsym = sym;
-#endif
- Elf32_Addr value;
- const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
-#if !defined RESOLVE_CONFLICT_FIND_MAP
- struct link_map *sym_map = NULL;
-#endif
-
-#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);
-#endif
-
- if (__glibc_unlikely (r_type == R_SPARC_NONE))
- return;
-
- if (__glibc_unlikely (r_type == R_SPARC_SIZE32))
- {
- *reloc_addr = sym->st_size + reloc->r_addend;
- return;
- }
-
-#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
- if (__glibc_unlikely (r_type == R_SPARC_RELATIVE))
- {
-# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
- if (map != &_dl_rtld_map) /* Already done in rtld itself. */
-# endif
- *reloc_addr += map->l_addr + reloc->r_addend;
- return;
- }
-#endif
-
-#ifndef RESOLVE_CONFLICT_FIND_MAP
- if (__builtin_expect (ELF32_ST_BIND (sym->st_info) == STB_LOCAL, 0)
- && sym->st_shndx != SHN_UNDEF)
- {
- value = map->l_addr;
- }
- else
- {
- sym_map = RESOLVE_MAP (&sym, version, r_type);
- value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value;
- }
-#else
- value = 0;
-#endif
-
- value += reloc->r_addend; /* Assume copy relocs have zero addend. */
-
- 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 = ((Elf32_Addr (*) (int)) value) (GLRO(dl_hwcap));
- }
-
- switch (r_type)
- {
-#if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP
- 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
- || (GLRO(dl_verbose) && sym->st_size < refsym->st_size))
- {
- 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",
- RTLD_PROGNAME, strtab + refsym->st_name);
- }
- memcpy (reloc_addr_arg, (void *) value,
- MIN (sym->st_size, refsym->st_size));
- break;
-#endif
- case R_SPARC_GLOB_DAT:
- case R_SPARC_32:
- *reloc_addr = value;
- break;
- case R_SPARC_IRELATIVE:
- value = ((Elf32_Addr (*) (int)) value) (GLRO(dl_hwcap));
- *reloc_addr = value;
- break;
- case R_SPARC_JMP_IREL:
- value = ((Elf32_Addr (*) (int)) value) (GLRO(dl_hwcap));
- /* Fall thru */
- case R_SPARC_JMP_SLOT:
- {
-#if !defined RTLD_BOOTSTRAP && !defined __sparc_v9__
- /* Note that we don't mask the hwcap here, as the flush is
- essential to functionality on those cpu's that implement
- it. For sparcv9 we can assume flush is present. */
- const int do_flush = GLRO(dl_hwcap) & HWCAP_SPARC_FLUSH;
-#else
- /* Unfortunately, this is necessary, so that we can ensure
- ld.so will not execute corrupt PLT entry instructions. */
- const int do_flush = 1;
-#endif
- /* At this point we don't need to bother with thread safety,
- so we can optimize the first instruction of .plt out. */
- sparc_fixup_plt (reloc, reloc_addr, value, 0, do_flush);
- }
- break;
-#ifndef RESOLVE_CONFLICT_FIND_MAP
- case R_SPARC_TLS_DTPMOD32:
- /* Get the information from the link map returned by the
- resolv function. */
- if (sym_map != NULL)
- *reloc_addr = sym_map->l_tls_modid;
- break;
- case R_SPARC_TLS_DTPOFF32:
- /* During relocation all TLS symbols are defined and used.
- Therefore the offset is already correct. */
- *reloc_addr = (sym == NULL ? 0 : sym->st_value) + reloc->r_addend;
- break;
- case R_SPARC_TLS_TPOFF32:
- /* The offset is negative, forward from the thread pointer. */
- /* We know the offset of 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 - sym_map->l_tls_offset
- + reloc->r_addend;
- }
- break;
-# ifndef RTLD_BOOTSTRAP
- case R_SPARC_TLS_LE_HIX22:
- case R_SPARC_TLS_LE_LOX10:
- if (sym != NULL)
- {
- CHECK_STATIC_TLS (map, sym_map);
- value = sym->st_value - sym_map->l_tls_offset
- + reloc->r_addend;
- if (r_type == R_SPARC_TLS_LE_HIX22)
- *reloc_addr = (*reloc_addr & 0xffc00000) | ((~value) >> 10);
- else
- *reloc_addr = (*reloc_addr & 0xffffe000) | (value & 0x3ff)
- | 0x1c00;
- }
- break;
-# endif
-#endif
-#ifndef RTLD_BOOTSTRAP
- case R_SPARC_8:
- *(char *) reloc_addr = value;
- break;
- case R_SPARC_16:
- *(short *) reloc_addr = value;
- break;
- case R_SPARC_DISP8:
- *(char *) reloc_addr = (value - (Elf32_Addr) reloc_addr);
- break;
- case R_SPARC_DISP16:
- *(short *) reloc_addr = (value - (Elf32_Addr) reloc_addr);
- break;
- case R_SPARC_DISP32:
- *reloc_addr = (value - (Elf32_Addr) reloc_addr);
- break;
- case R_SPARC_LO10:
- *reloc_addr = (*reloc_addr & ~0x3ff) | (value & 0x3ff);
- break;
- case R_SPARC_WDISP30:
- *reloc_addr = ((*reloc_addr & 0xc0000000)
- | ((value - (unsigned int) reloc_addr) >> 2));
- break;
- case R_SPARC_HI22:
- *reloc_addr = (*reloc_addr & 0xffc00000) | (value >> 10);
- break;
- case R_SPARC_UA16:
- ((unsigned char *) reloc_addr_arg) [0] = value >> 8;
- ((unsigned char *) reloc_addr_arg) [1] = value;
- break;
- case R_SPARC_UA32:
- ((unsigned char *) reloc_addr_arg) [0] = value >> 24;
- ((unsigned char *) reloc_addr_arg) [1] = value >> 16;
- ((unsigned char *) reloc_addr_arg) [2] = value >> 8;
- ((unsigned char *) reloc_addr_arg) [3] = value;
- break;
-#endif
-#if !defined RTLD_BOOTSTRAP || defined _NDEBUG
- default:
- _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);
-
- if (__glibc_likely (r_type == R_SPARC_JMP_SLOT))
- ;
- else if (r_type == R_SPARC_JMP_IREL)
- {
- Elf32_Addr value = map->l_addr + reloc->r_addend;
- if (__glibc_likely (!skip_ifunc))
- value = ((Elf32_Addr (*) (int)) value) (GLRO(dl_hwcap));
- sparc_fixup_plt (reloc, reloc_addr, value, 1, 1);
- }
- else if (r_type == R_SPARC_NONE)
- ;
- else
- _dl_reloc_bad_type (map, r_type, 1);
-}
-
-#endif /* RESOLVE_MAP */
generated by cgit v1.2.3-70-g09d2 (git 2.48.1) at 2025-04-09 01:41:50 +0000