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-rw-r--r--ports/sysdeps/mips/dl-trampoline.c513
1 files changed, 0 insertions, 513 deletions
diff --git a/ports/sysdeps/mips/dl-trampoline.c b/ports/sysdeps/mips/dl-trampoline.c
deleted file mode 100644
index f565654934..0000000000
--- a/ports/sysdeps/mips/dl-trampoline.c
+++ /dev/null
@@ -1,513 +0,0 @@
-/* PLT trampoline. MIPS version.
- Copyright (C) 1996-2014 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)
- {
- 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 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 22:50:05 +0000