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Diffstat (limited to 'sysdeps/csky/dl-machine.h')
| -rw-r--r-- | sysdeps/csky/dl-machine.h | 362 |
1 files changed, 362 insertions, 0 deletions
diff --git a/sysdeps/csky/dl-machine.h b/sysdeps/csky/dl-machine.h new file mode 100644 index 0000000000..451c8f7920 --- /dev/null +++ b/sysdeps/csky/dl-machine.h @@ -0,0 +1,362 @@ +/* Machine-dependent ELF dynamic relocation inline functions. C-SKY version. + Copyright (C) 2018 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 "csky" + +#include <sys/param.h> +#include <sysdep.h> +#include <dl-tls.h> + +/* Return nonzero if ELF header is compatible with the running host. */ +static inline int +elf_machine_matches_host (const Elf32_Ehdr *ehdr) +{ + return ehdr->e_machine == EM_CSKY; +} + +/* Return the link-time address of _DYNAMIC. + This must be inlined in a function which uses global data. */ +static inline Elf32_Addr +elf_machine_dynamic (void) +{ + register Elf32_Addr *got __asm__ ("gb"); + return *got; +} + +/* Return the run-time load address ,of the shared object. */ +static inline Elf32_Addr +elf_machine_load_address (void) +{ + extern Elf32_Addr __dl_start (void *) asm ("_dl_start"); + Elf32_Addr got_addr = (Elf32_Addr) &__dl_start; + Elf32_Addr pcrel_addr; + asm ("grs %0,_dl_start\n" : "=r" (pcrel_addr)); + + return pcrel_addr - got_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__ ((always_inline)) +elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) +{ + Elf32_Addr *got; + extern void _dl_runtime_resolve (Elf32_Word); + + 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]. */ + got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]); + + if (got[1]) + l->l_mach.plt = got[1] + l->l_addr; + 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. */ + got[2] = (Elf32_Addr) &_dl_runtime_resolve; + } + return lazy; +} + +/* Mask identifying addresses reserved for the user program, + where the dynamic linker should not map anything. */ +#define ELF_MACHINE_USER_ADDRESS_MASK 0x80000000UL + +/* 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 ("\ +.text\n\ +.globl _start\n\ +.type _start, @function\n\ +.globl _dl_start_user\n\ +.type _dl_start_user, @function\n\ +_start:\n\ + grs gb, .Lgetpc1\n\ +.Lgetpc1:\n\ + lrw t0, .Lgetpc1@GOTPC\n\ + addu gb, t0\n\ + mov a0, sp\n\ + lrw t1, _dl_start@GOTOFF\n\ + addu t1, gb\n\ + jsr t1\n\ +_dl_start_user:\n\ + /* get _dl_skip_args */ \n\ + lrw r11, _dl_skip_args@GOTOFF\n\ + addu r11, gb\n\ + ldw r11, (r11, 0)\n\ + /* store program entry address in r11 */ \n\ + mov r10, a0\n\ + /* Get argc */\n\ + ldw a1, (sp, 0)\n\ + /* Get **argv */\n\ + mov a2, sp\n\ + addi a2, 4\n\ + cmpnei r11, 0\n\ + bt .L_fixup_stack\n\ +.L_done_fixup:\n\ + mov a3, a1\n\ + lsli a3, 2\n\ + add a3, a2\n\ + addi a3, 4\n\ + lrw a0, _rtld_local@GOTOFF\n\ + addu a0, gb\n\ + ldw a0, (a0, 0)\n\ + lrw t1, _dl_init@PLT\n\ + addu t1, gb\n\ + ldw t1, (t1)\n\ + jsr t1\n\ + lrw a0, _dl_fini@GOTOFF\n\ + addu a0, gb\n\ + jmp r10\n\ +.L_fixup_stack:\n\ + subu a1, r11\n\ + lsli r11, 2\n\ + addu sp, r11\n\ + stw a1, (sp, 0)\n\ + mov a2, sp\n\ + addi a2, 4\n\ + lrw a3, _dl_argv@GOTOFF\n\ + addu a3, gb\n\ + stw a2, (a3, 0)\n\ + br .L_done_fixup\n\ +"); + +/* 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_NOCOPY iff TYPE should not be allowed to resolve to one + of the main executable's symbols, as for a COPY reloc. */ +#ifndef RTLD_BOOTSTRAP +# define elf_machine_type_class(type) \ + ((((type) == R_CKCORE_JUMP_SLOT || (type) == R_CKCORE_TLS_DTPMOD32 \ + || (type) == R_CKCORE_TLS_DTPOFF32 || (type) == R_CKCORE_TLS_TPOFF32) \ + * ELF_RTYPE_CLASS_PLT) \ + | (((type) == R_CKCORE_COPY) * ELF_RTYPE_CLASS_COPY)) +#else +# define elf_machine_type_class(type) \ + ((((type) == R_CKCORE_JUMP_SLOT \ + | (((type) == R_CKCORE_COPY) * ELF_RTYPE_CLASS_COPY)) +#endif + +/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ +#define ELF_MACHINE_JMP_SLOT R_CKCORE_JUMP_SLOT + +/* C-SKY never uses Elf32_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 Elf32_Addr +elf_machine_fixup_plt (struct link_map *map, lookup_t t, + const ElfW(Sym) *refsym, const ElfW(Sym) *sym, + const Elf32_Rela *reloc, + Elf32_Addr *reloc_addr, Elf32_Addr value) +{ + return *reloc_addr = value; +} + +/* Return the final value of a plt relocation. On the csky the JMP_SLOT + relocation ignores the addend. */ +static inline Elf32_Addr +elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc, + Elf32_Addr value) +{ + return value; +} + +/* Names of the architecture-specific auditing callback functions. */ +#define ARCH_LA_PLTENTER csky_gnu_pltenter +#define ARCH_LA_PLTEXIT csky_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__ ((unused, 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; + const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); + unsigned short __attribute__ ((unused)) *opcode16_addr; + Elf32_Addr __attribute__ ((unused)) insn_opcode = 0x0; + + if (__builtin_expect (r_type == R_CKCORE_RELATIVE, 0)) + *reloc_addr = map->l_addr + reloc->r_addend; + else + { + const Elf32_Sym *const refsym = sym; + struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); + ElfW(Addr) value = SYMBOL_ADDRESS (sym_map, sym, true); + opcode16_addr = (unsigned short *)reloc_addr; + + switch (r_type) + { + case R_CKCORE_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 + || (sym->st_size < refsym->st_size && GLRO(dl_verbose))) + { + 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 ?: "<program name unknown>", + strtab + refsym->st_name); + } + memcpy (reloc_addr_arg, (void *) value, + MIN (sym->st_size, refsym->st_size)); + break; + case R_CKCORE_GLOB_DAT: + case R_CKCORE_JUMP_SLOT: + *reloc_addr = value; + break; + case R_CKCORE_ADDR32: + *reloc_addr = value + reloc->r_addend; + break; + case R_CKCORE_PCREL32: + *reloc_addr = value + reloc->r_addend - (Elf32_Addr) reloc_addr; + break; +#if defined(__CK810__) || defined(__CK807__) + case R_CKCORE_ADDR_HI16: + insn_opcode = (*opcode16_addr << 16) | (*(opcode16_addr + 1)); + insn_opcode = (insn_opcode & 0xffff0000) + | (((value + reloc->r_addend) >> 16) & 0xffff); + *(opcode16_addr++) = (unsigned short)(insn_opcode >> 16); + *opcode16_addr = (unsigned short)(insn_opcode & 0xffff); + break; + case R_CKCORE_ADDR_LO16: + insn_opcode = (*opcode16_addr << 16) | (*(opcode16_addr + 1)); + insn_opcode = (insn_opcode & 0xffff0000) + | ((value + reloc->r_addend) & 0xffff); + *(opcode16_addr++) = (unsigned short)(insn_opcode >> 16); + *opcode16_addr = (unsigned short)(insn_opcode & 0xffff); + break; + case R_CKCORE_PCREL_IMM26BY2: + { + unsigned int offset = ((value + reloc->r_addend - + (unsigned int)reloc_addr) >> 1); + insn_opcode = (*opcode16_addr << 16) | (*(opcode16_addr + 1)); + if (offset > 0x3ffffff){ + const char *strtab; + strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); + + _dl_error_printf ("\ +%s:The reloc R_CKCORE_PCREL_IMM26BY2 cannot reach the symbol '%s'.\n", + rtld_progname ?: "<program name unknown>", + strtab + refsym->st_name); + break; + } + insn_opcode = (insn_opcode & ~0x3ffffff) | offset; + *(opcode16_addr++) = (unsigned short)(insn_opcode >> 16); + *opcode16_addr = (unsigned short)(insn_opcode & 0xffff); + break; + } + case R_CKCORE_PCREL_JSR_IMM26BY2: + break; +#endif +#ifndef RTLD_BOOTSTRAP + case R_CKCORE_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_CKCORE_TLS_DTPOFF32: + if (sym != NULL) + *reloc_addr =(sym == NULL ? 0 : sym->st_value) + reloc->r_addend; + break; + case R_CKCORE_TLS_TPOFF32: + if (sym != NULL) + { + CHECK_STATIC_TLS (map, sym_map); + *reloc_addr = (sym->st_value + sym_map->l_tls_offset + + reloc->r_addend); + } + break; +#endif /* !RTLD_BOOTSTRAP */ + case R_CKCORE_NONE: + break; + default: + break; + } + } +} + +auto inline void __attribute__ ((unused, 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__ ((unused, 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 (ELF32_R_TYPE (reloc->r_info) == R_CKCORE_JUMP_SLOT) + { + /* Check for unexpected PLT reloc type. */ + if (__builtin_expect (r_type == R_CKCORE_JUMP_SLOT, 1)) + { + if (__builtin_expect (map->l_mach.plt, 0) == 0) + *reloc_addr = l_addr + reloc->r_addend; + else + *reloc_addr = map->l_mach.plt; + } + } +} + +#endif /* RESOLVE_MAP */ |