diff options
Diffstat (limited to 'sysdeps/mips/dl-trampoline.c')
| -rw-r--r-- | sysdeps/mips/dl-trampoline.c | 513 |
1 files changed, 0 insertions, 513 deletions
diff --git a/sysdeps/mips/dl-trampoline.c b/sysdeps/mips/dl-trampoline.c deleted file mode 100644 index 243c4d1f54..0000000000 --- a/sysdeps/mips/dl-trampoline.c +++ /dev/null @@ -1,513 +0,0 @@ -/* PLT trampoline. MIPS version. - Copyright (C) 1996-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Kazumoto Kojima <kkojima@info.kanagawa-u.ac.jp>. - - 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/>. */ - -/* FIXME: Profiling of shared libraries is not implemented yet. */ - -#include <sysdep.h> -#include <link.h> -#include <elf.h> -#include <ldsodefs.h> -#include <dl-machine.h> -#include <sysdep-cancel.h> - -/* Get link map for callers object containing STUB_PC. */ -static inline struct link_map * -elf_machine_runtime_link_map (ElfW(Addr) gpreg, ElfW(Addr) stub_pc) -{ - extern int _dl_mips_gnu_objects; - - /* got[1] is reserved to keep its link map address for the shared - object generated by the gnu linker. If all are such objects, we - can find the link map from current GPREG simply. If not so, get - the link map for caller's object containing STUB_PC. */ - - if (_dl_mips_gnu_objects) - { - ElfW(Addr) *got = elf_mips_got_from_gpreg (gpreg); - ElfW(Word) g1; - - g1 = ((ElfW(Word) *) got)[1]; - - if ((g1 & ELF_MIPS_GNU_GOT1_MASK) != 0) - { - struct link_map *l = - (struct link_map *) (g1 & ~ELF_MIPS_GNU_GOT1_MASK); - ElfW(Addr) base, limit; - const ElfW(Phdr) *p = l->l_phdr; - ElfW(Half) this, nent = l->l_phnum; - - /* For the common case of a stub being called from the containing - object, STUB_PC will point to somewhere within the object that - is described by the link map fetched via got[1]. Otherwise we - have to scan all maps. */ - for (this = 0; this < nent; this++) - { - if (p[this].p_type == PT_LOAD) - { - base = p[this].p_vaddr + l->l_addr; - limit = base + p[this].p_memsz; - if (stub_pc >= base && stub_pc < limit) - return l; - } - } - } - } - - struct link_map *l; - Lmid_t nsid; - - for (nsid = 0; nsid < DL_NNS; ++nsid) - for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next) - { - ElfW(Addr) base, limit; - const ElfW(Phdr) *p = l->l_phdr; - ElfW(Half) this, nent = l->l_phnum; - - for (this = 0; this < nent; ++this) - { - if (p[this].p_type == PT_LOAD) - { - base = p[this].p_vaddr + l->l_addr; - limit = base + p[this].p_memsz; - if (stub_pc >= base && stub_pc < limit) - return l; - } - } - } - - _dl_signal_error (0, NULL, NULL, "cannot find runtime link map"); - return NULL; -} - -/* Define mips specific runtime resolver. The function __dl_runtime_resolve - is called from assembler function _dl_runtime_resolve which converts - special argument registers t7 ($15) and t8 ($24): - t7 address to return to the caller of the function - t8 index for this function symbol in .dynsym - to usual c arguments. - - Other architectures call fixup from dl-runtime.c in - _dl_runtime_resolve. MIPS instead calls __dl_runtime_resolve. We - have to use our own version because of the way the got section is - treated on MIPS (we've also got ELF_MACHINE_PLT defined). */ - -/* The flag _dl_mips_gnu_objects is set if all dynamic objects are - generated by the gnu linker. */ -int _dl_mips_gnu_objects = 1; - -/* This is called from assembly stubs below which the compiler can't see. */ -static ElfW(Addr) -__dl_runtime_resolve (ElfW(Word), ElfW(Word), ElfW(Addr), ElfW(Addr)) - __attribute_used__; - -static ElfW(Addr) -__dl_runtime_resolve (ElfW(Word) sym_index, - ElfW(Word) return_address, - ElfW(Addr) old_gpreg, - ElfW(Addr) stub_pc) -{ - struct link_map *l = elf_machine_runtime_link_map (old_gpreg, stub_pc); - const ElfW(Sym) *const symtab - = (const ElfW(Sym) *) D_PTR (l, l_info[DT_SYMTAB]); - const char *strtab = (const void *) D_PTR (l, l_info[DT_STRTAB]); - ElfW(Addr) *got - = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]); - const ElfW(Word) local_gotno - = (const ElfW(Word)) l->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val; - const ElfW(Word) gotsym - = (const ElfW(Word)) l->l_info[DT_MIPS (GOTSYM)]->d_un.d_val; - const ElfW(Sym) *sym = &symtab[sym_index]; - struct link_map *sym_map; - ElfW(Addr) value; - - /* FIXME: The symbol versioning stuff is not tested yet. */ - if (__builtin_expect (ELFW(ST_VISIBILITY) (sym->st_other), 0) == 0) - { - switch (l->l_info[VERSYMIDX (DT_VERSYM)] != NULL ? 1 : 0) - { - default: - { - const ElfW(Half) *vernum = - (const void *) D_PTR (l, l_info[VERSYMIDX (DT_VERSYM)]); - ElfW(Half) ndx = vernum[sym_index] & 0x7fff; - const struct r_found_version *version = &l->l_versions[ndx]; - - if (version->hash != 0) - { - /* We need to keep the scope around so do some locking. This is - not necessary for objects which cannot be unloaded or when - we are not using any threads (yet). */ - if (!RTLD_SINGLE_THREAD_P) - THREAD_GSCOPE_SET_FLAG (); - - sym_map = _dl_lookup_symbol_x (strtab + sym->st_name, l, - &sym, l->l_scope, version, - ELF_RTYPE_CLASS_PLT, 0, 0); - - /* We are done with the global scope. */ - if (!RTLD_SINGLE_THREAD_P) - THREAD_GSCOPE_RESET_FLAG (); - - break; - } - /* Fall through. */ - } - case 0: - { - /* We need to keep the scope around so do some locking. This is - not necessary for objects which cannot be unloaded or when - we are not using any threads (yet). */ - int flags = DL_LOOKUP_ADD_DEPENDENCY; - if (!RTLD_SINGLE_THREAD_P) - { - THREAD_GSCOPE_SET_FLAG (); - flags |= DL_LOOKUP_GSCOPE_LOCK; - } - - sym_map = _dl_lookup_symbol_x (strtab + sym->st_name, l, &sym, - l->l_scope, 0, ELF_RTYPE_CLASS_PLT, - flags, 0); - - /* We are done with the global scope. */ - if (!RTLD_SINGLE_THREAD_P) - THREAD_GSCOPE_RESET_FLAG (); - } - } - - /* Currently value contains the base load address of the object - that defines sym. Now add in the symbol offset. */ - value = (sym ? sym_map->l_addr + sym->st_value : 0); - } - else - /* We already found the symbol. The module (and therefore its load - address) is also known. */ - value = l->l_addr + sym->st_value; - - /* Apply the relocation with that value. */ - *(got + local_gotno + sym_index - gotsym) = value; - - return value; -} - -#if _MIPS_SIM == _ABIO32 -#define ELF_DL_FRAME_SIZE 40 - -#define ELF_DL_SAVE_ARG_REGS "\ - sw $15, 36($29)\n \ - sw $4, 16($29)\n \ - sw $5, 20($29)\n \ - sw $6, 24($29)\n \ - sw $7, 28($29)\n \ -" - -#define ELF_DL_RESTORE_ARG_REGS "\ - lw $31, 36($29)\n \ - lw $4, 16($29)\n \ - lw $5, 20($29)\n \ - lw $6, 24($29)\n \ - lw $7, 28($29)\n \ -" - -/* The PLT resolver should also save and restore $2 and $3, which are used - as arguments to MIPS16 stub functions. */ -#define ELF_DL_PLT_FRAME_SIZE 48 - -#define ELF_DL_PLT_SAVE_ARG_REGS \ - ELF_DL_SAVE_ARG_REGS "\ - sw $2, 40($29)\n \ - sw $3, 44($29)\n \ -" - -#define ELF_DL_PLT_RESTORE_ARG_REGS \ - ELF_DL_RESTORE_ARG_REGS "\ - lw $2, 40($29)\n \ - lw $3, 44($29)\n \ -" - -#define IFABIO32(X) X -#define IFNEWABI(X) - -#else /* _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64 */ - -#define ELF_DL_FRAME_SIZE 80 - -#define ELF_DL_SAVE_ARG_REGS "\ - sd $15, 72($29)\n \ - sd $4, 8($29)\n \ - sd $5, 16($29)\n \ - sd $6, 24($29)\n \ - sd $7, 32($29)\n \ - sd $8, 40($29)\n \ - sd $9, 48($29)\n \ - sd $10, 56($29)\n \ - sd $11, 64($29)\n \ -" - -#define ELF_DL_RESTORE_ARG_REGS "\ - ld $31, 72($29)\n \ - ld $4, 8($29)\n \ - ld $5, 16($29)\n \ - ld $6, 24($29)\n \ - ld $7, 32($29)\n \ - ld $8, 40($29)\n \ - ld $9, 48($29)\n \ - ld $10, 56($29)\n \ - ld $11, 64($29)\n \ -" - -/* The PLT resolver should also save and restore $2 and $3, which are used - as arguments to MIPS16 stub functions. */ -#define ELF_DL_PLT_FRAME_SIZE 96 - -#define ELF_DL_PLT_SAVE_ARG_REGS \ - ELF_DL_SAVE_ARG_REGS "\ - sd $2, 80($29)\n \ - sd $3, 88($29)\n \ -" - -#define ELF_DL_PLT_RESTORE_ARG_REGS \ - ELF_DL_RESTORE_ARG_REGS "\ - ld $2, 80($29)\n \ - ld $3, 88($29)\n \ -" - -#define IFABIO32(X) -#define IFNEWABI(X) X - -#endif - -#ifndef __mips16 -asm ("\n\ - .text\n\ - .align 2\n\ - .set nomips16\n\ - .globl _dl_runtime_resolve\n\ - .type _dl_runtime_resolve,@function\n\ - .ent _dl_runtime_resolve\n\ -_dl_runtime_resolve:\n\ - .frame $29, " STRINGXP(ELF_DL_FRAME_SIZE) ", $31\n\ - .set noreorder\n\ - # Save GP.\n\ -1: move $3, $28\n\ - # Save arguments and sp value in stack.\n\ - " STRINGXP(PTR_SUBIU) " $29, " STRINGXP(ELF_DL_FRAME_SIZE) "\n\ - # Modify t9 ($25) so as to point .cpload instruction.\n\ - " IFABIO32(STRINGXP(PTR_ADDIU) " $25, (2f-1b)\n") "\ - # Compute GP.\n\ -2: " STRINGXP(SETUP_GP) "\n\ - " STRINGXV(SETUP_GP64 (0, _dl_runtime_resolve)) "\n\ - .set reorder\n\ - # Save slot call pc.\n\ - move $2, $31\n\ - " IFABIO32(STRINGXP(CPRESTORE(32))) "\n\ - " ELF_DL_SAVE_ARG_REGS "\ - move $4, $24\n\ - move $5, $15\n\ - move $6, $3\n\ - move $7, $2\n\ - jal __dl_runtime_resolve\n\ - " ELF_DL_RESTORE_ARG_REGS "\ - " STRINGXP(RESTORE_GP64) "\n\ - " STRINGXP(PTR_ADDIU) " $29, " STRINGXP(ELF_DL_FRAME_SIZE) "\n\ - move $25, $2\n\ - jr $25\n\ - .end _dl_runtime_resolve\n\ - .previous\n\ -"); - -/* Assembler veneer called from the PLT header code when using PLTs. - - Code in each PLT entry and the PLT header fills in the arguments to - this function: - - - $15 (o32 t7, n32/n64 t3) - caller's return address - - $24 (t8) - PLT entry index - - $25 (t9) - address of _dl_runtime_pltresolve - - o32 $28 (gp), n32/n64 $14 (t2) - address of .got.plt - - Different registers are used for .got.plt because the ABI was - originally designed for o32, where gp was available (call - clobbered). On n32/n64 gp is call saved. - - _dl_fixup needs: - - - $4 (a0) - link map address - - $5 (a1) - .rel.plt offset (== PLT entry index * 8) */ - -asm ("\n\ - .text\n\ - .align 2\n\ - .set nomips16\n\ - .globl _dl_runtime_pltresolve\n\ - .type _dl_runtime_pltresolve,@function\n\ - .ent _dl_runtime_pltresolve\n\ -_dl_runtime_pltresolve:\n\ - .frame $29, " STRINGXP(ELF_DL_PLT_FRAME_SIZE) ", $31\n\ - .set noreorder\n\ - # Save arguments and sp value in stack.\n\ -1: " STRINGXP(PTR_SUBIU) " $29, " STRINGXP(ELF_DL_PLT_FRAME_SIZE) "\n\ - " IFABIO32(STRINGXP(PTR_L) " $13, " STRINGXP(PTRSIZE) "($28)") "\n\ - " IFNEWABI(STRINGXP(PTR_L) " $13, " STRINGXP(PTRSIZE) "($14)") "\n\ - # Modify t9 ($25) so as to point .cpload instruction.\n\ - " IFABIO32(STRINGXP(PTR_ADDIU) " $25, (2f-1b)\n") "\ - # Compute GP.\n\ -2: " STRINGXP(SETUP_GP) "\n\ - " STRINGXV(SETUP_GP64 (0, _dl_runtime_pltresolve)) "\n\ - .set reorder\n\ - " IFABIO32(STRINGXP(CPRESTORE(32))) "\n\ - " ELF_DL_PLT_SAVE_ARG_REGS "\ - move $4, $13\n\ - sll $5, $24, " STRINGXP(PTRLOG) " + 1\n\ - jal _dl_fixup\n\ - move $25, $2\n\ - " ELF_DL_PLT_RESTORE_ARG_REGS "\ - " STRINGXP(RESTORE_GP64) "\n\ - " STRINGXP(PTR_ADDIU) " $29, " STRINGXP(ELF_DL_PLT_FRAME_SIZE) "\n\ - jr $25\n\ - .end _dl_runtime_pltresolve\n\ - .previous\n\ -"); - -#elif _MIPS_SIM == _ABIO32 /* __mips16 */ -/* MIPS16 version, O32 only. */ -asm ("\n\ - .text\n\ - .align 2\n\ - .set mips16\n\ - .globl _dl_runtime_resolve\n\ - .type _dl_runtime_resolve,@function\n\ - .ent _dl_runtime_resolve\n\ -_dl_runtime_resolve:\n\ - .frame $29, " STRINGXP (ELF_DL_FRAME_SIZE) ", $31\n\ - # Save arguments and sp value in stack.\n\t" -# if _MIPS_ISA >= _MIPS_ISA_MIPS32 - "save " STRINGXP (ELF_DL_FRAME_SIZE) ", $4-$7, $ra\n\t" -# else - "addiu $sp, -" STRINGXP (ELF_DL_FRAME_SIZE) "\n\ - sw $7, 32($sp)\n\ - sw $6, 28($sp)\n\ - sw $5, 24($sp)\n\ - sw $4, 20($sp)\n\t" -# endif - "# Preserve caller's $ra, for RESTORE instruction below.\n\ - move $5, $15\n\ - sw $5, 36($sp)\n\ - # Compute GP into $2.\n\ - li $2, %hi(_gp_disp)\n\ - addiu $3, $pc, %lo(_gp_disp)\n\ - sll $2, 16\n\ - addu $2, $3\n\ - lw $3, %got(__dl_runtime_resolve)($2)\n\ - move $4, $24\n\ - addiu $3, %lo(__dl_runtime_resolve)\n\ - move $7, $ra\n\ - move $6, $28\n\ - move $25, $3\n\ - jalr $3\n\t" -# if _MIPS_ISA >= _MIPS_ISA_MIPS32 - "restore " STRINGXP(ELF_DL_FRAME_SIZE) ", $4-$7, $ra\n\t" -# else - "# Restore $ra, move placed further down to hide latency.\n\ - lw $4, 36($sp)\n\ - lw $5, 24($sp)\n\ - lw $6, 28($sp)\n\ - lw $7, 32($sp)\n\ - move $ra, $4\n\ - lw $4, 20($sp)\n\ - addiu $sp, " STRINGXP(ELF_DL_FRAME_SIZE) "\n\t" -# endif - "move $25, $2\n\ - jr $2\n\ - .end _dl_runtime_resolve\n\ - .previous\n\ -"); - -asm ("\n\ - .text\n\ - .align 2\n\ - .set mips16\n\ - .globl _dl_runtime_pltresolve\n\ - .type _dl_runtime_pltresolve,@function\n\ - .ent _dl_runtime_pltresolve\n\ -_dl_runtime_pltresolve:\n\ - .frame $29, " STRINGXP(ELF_DL_PLT_FRAME_SIZE) ", $31\n\ - # Save arguments and sp value in stack.\n\t" -# if _MIPS_ISA >= _MIPS_ISA_MIPS32 - "save " STRINGXP(ELF_DL_PLT_FRAME_SIZE) ", $4-$7, $ra\n\t" -# else - "addiu $sp, -" STRINGXP(ELF_DL_PLT_FRAME_SIZE) "\n\ - sw $7, 40($sp)\n\ - sw $6, 36($sp)\n\ - sw $5, 32($sp)\n\ - sw $4, 28($sp)\n\t" -# endif - "# Preserve MIPS16 stub function arguments.\n\ - sw $3, 20($sp)\n\ - sw $2, 16($sp)\n\ - # Preserve caller's $ra, for RESTORE instruction below.\n\ - move $3, $15\n\ - sw $3, 44($sp)\n\ - # Compute GP into $2.\n\ - li $2, %hi(_gp_disp)\n\ - addiu $3, $pc, %lo(_gp_disp)\n\ - sll $2, 16\n\ - addu $2, $3\n\ - # Save GP value in slot.\n\ - sw $2, 24($sp)\n\ - # Load _dl_fixup address.\n\ - lw $6, %call16(_dl_fixup)($2)\n\ - # Load link map address.\n\ - move $3, $28\n\ - lw $4, " STRINGXP (PTRSIZE) "($3)\n\ - move $5, $24\n\ - sll $5, " STRINGXP (PTRLOG) " + 1\n\ - # Call _dl_fixup.\n\ - move $25, $6\n\ - jalr $6\n\ - move $25, $2\n\ - # Reload GP value into $28.\n\ - lw $3, 24($sp)\n\ - move $28, $3\n\ - lw $3, 16($sp)\n\ - move $15, $3\n\ - lw $3, 20($sp)\n\t" -# if _MIPS_ISA >= _MIPS_ISA_MIPS32 - "restore " STRINGXP (ELF_DL_PLT_FRAME_SIZE) ", $4-$7, $ra\n\t" -# else - "# Restore $ra, move placed further down to hide latency.\n\ - lw $4, 44($sp)\n\ - lw $5, 32($sp)\n\ - lw $6, 36($sp)\n\ - lw $7, 40($sp)\n\ - move $ra, $4\n\ - lw $4, 28($sp)\n\ - addiu $sp, " STRINGXP (ELF_DL_PLT_FRAME_SIZE) "\n\t" -# endif - ".set noreorder\n\ - jr $2\n\ - move $2, $15\n\ - .set reorder\n\ - .end _dl_runtime_pltresolve\n\ - .previous\n\ -"); - -#else /* __mips16 && _MIPS_SIM != _ABIO32 */ -# error "MIPS16 support for N32/N64 not implemented" - -#endif /* __mips16 */ |