summaryrefslogtreecommitdiff
path: root/ports/sysdeps/am33/dl-machine.h
diff options
context:
space:
mode:
Diffstat (limited to 'ports/sysdeps/am33/dl-machine.h')
-rw-r--r--ports/sysdeps/am33/dl-machine.h481
1 files changed, 481 insertions, 0 deletions
diff --git a/ports/sysdeps/am33/dl-machine.h b/ports/sysdeps/am33/dl-machine.h
new file mode 100644
index 0000000000..52278c0a4e
--- /dev/null
+++ b/ports/sysdeps/am33/dl-machine.h
@@ -0,0 +1,481 @@
+/* Machine-dependent ELF dynamic relocation inline functions. AM33 version.
+ Copyright (C) 1995,96,97,98,99,2000,2001, 2004, 2011
+ 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. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef dl_machine_h
+#define dl_machine_h
+
+#define ELF_MACHINE_NAME "mn10300"
+
+#include <sys/param.h>
+
+/* Return nonzero iff ELF header is compatible with the running host. */
+static inline int __attribute__ ((unused))
+elf_machine_matches_host (const Elf32_Ehdr *ehdr)
+{
+ return ehdr->e_machine == EM_MN10300;
+}
+
+
+/* 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 __attribute__ ((unused))
+elf_machine_dynamic (void)
+{
+ register Elf32_Addr *got asm ("a2");
+ return *got;
+}
+
+
+/* Return the run-time load address of the shared object. */
+static inline Elf32_Addr __attribute__ ((unused))
+elf_machine_load_address (void)
+{
+ register Elf32_Addr gotaddr asm ("a2");
+ Elf32_Addr off, gotval;
+
+ asm ("mov _dl_start@GOTOFF,%0" : "=r" (off));
+ asm ("mov (_dl_start@GOT,%1),%0" : "=r" (gotval) : "r" (gotaddr));
+
+ return off + gotaddr - gotval;
+}
+
+#if !defined PROF && !__BOUNDED_POINTERS__
+/* We add a declaration of this function here so that in dl-runtime.c
+ the ELF_MACHINE_RUNTIME_TRAMPOLINE macro really can pass the parameters
+ in registers.
+
+ We cannot use this scheme for profiling because the _mcount call
+ destroys the passed register information. */
+/* GKM FIXME: Fix trampoline to pass bounds so we can do
+ without the `__unbounded' qualifier. */
+static ElfW(Addr) fixup (struct link_map *__unbounded l, ElfW(Word) reloc_offset)
+ __attribute__ ((unused));
+static ElfW(Addr) profile_fixup (struct link_map *l, ElfW(Word) reloc_offset,
+ ElfW(Addr) retaddr)
+ __attribute__ ((unused));
+#endif
+
+/* 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__ ((unused))
+elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
+{
+ Elf32_Addr *got;
+ extern void _dl_runtime_resolve (Elf32_Word) attribute_hidden;
+ extern void _dl_runtime_profile (Elf32_Word) attribute_hidden;
+
+ 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 .rel.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]);
+ 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. */
+ if (__builtin_expect (profile, 0))
+ {
+ got[2] = (Elf32_Addr) &_dl_runtime_profile;
+
+ if (_dl_name_match_p (GLRO(dl_profile), l))
+ /* This is the object we are looking for. Say that we really
+ want profiling and the timers are started. */
+ GL(dl_profile_map) = l;
+ }
+ else
+ /* This function will get called to fix up the GOT entry indicated by
+ the offset on the stack, and then jump to the resolved address. */
+ got[2] = (Elf32_Addr) &_dl_runtime_resolve;
+ }
+
+ return lazy;
+}
+
+/* This code is used in dl-runtime.c to call the `fixup' function
+ and then redirect to the address it returns. */
+#if !defined PROF && !__BOUNDED_POINTERS__
+# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
+ .text\n\
+ .globl _dl_runtime_resolve\n\
+ .type _dl_runtime_resolve, @function\n\
+_dl_runtime_resolve:\n\
+ add -12,sp # Preserve registers otherwise clobbered.\n\
+ mov d1,(20,sp)\n\
+ mov d0,(16,sp)\n\
+ mov r1,d0\n\
+ mov r0,d1\n\
+ call fixup,[],0 # Call resolver.\n\
+ mov d0,a0\n\
+ mov (12,sp),d1 # Copy return address back to mdr,\n\
+ mov d1,mdr # in case the callee returns with retf\n\
+ mov (16,sp),d0 # Get register content back.\n\
+ mov (20,sp),d1\n\
+ add 12,sp\n\
+ jmp (a0)\n\
+ .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
+\n\
+ .globl _dl_runtime_profile\n\
+ .type _dl_runtime_profile, @function\n\
+_dl_runtime_profile:\n\
+ add -12,sp # Preserve registers otherwise clobbered.\n\
+ mov d1,(20,sp)\n\
+ mov d0,(16,sp)\n\
+ mov r1,d0\n\
+ mov r0,d1\n\
+ call profile_fixup,[],0 # Call resolver.\n\
+ mov d0,a0\n\
+ mov (12,sp),d1 # Copy return address back to mdr,\n\
+ mov d1,mdr # in case the callee returns with retf\n\
+ mov (16,sp),d0 # Get register content back.\n\
+ mov (20,sp),d1\n\
+ add 12,sp\n\
+ jmp (a0)\n\
+ .size _dl_runtime_profile, .-_dl_runtime_profile\n\
+ .previous\n\
+");
+#else
+# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\n\
+ .text\n\
+ .globl _dl_runtime_resolve\n\
+ .globl _dl_runtime_profile\n\
+ .type _dl_runtime_resolve, @function\n\
+ .type _dl_runtime_profile, @function\n\
+_dl_runtime_resolve:\n\
+_dl_runtime_profile:\n\
+ add -12,sp # Preserve registers otherwise clobbered.\n\
+ mov d1,(20,sp)\n\
+ mov d0,(16,sp)\n\
+ mov r1,d0\n\
+ mov r0,d1\n\
+ call profile_fixup,[],0 # Call resolver.\n\
+ mov d0,a0\n\
+ mov (12,sp),d1 # Copy return address back to mdr,\n\
+ mov d1,mdr # in case the callee returns with retf\n\
+ mov (16,sp),d0 # Get register content back.\n\
+ mov (20,sp),d1\n\
+ add 12,sp\n\
+ jmp (a0)\n\
+ .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
+ .size _dl_runtime_profile, .-_dl_runtime_profile\n\
+ .previous\n\
+");
+#endif
+
+/* Mask identifying addresses reserved for the user program,
+ where the dynamic linker should not map anything. */
+#define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL
+
+/* 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 ("\n\
+ .text\n\
+.globl _start\n\
+.globl _dl_start_user\n\
+_start:\n\
+ mov 0,a3 # Mark the top of the stack\n\
+ mov sp,a1\n\
+ add -20,sp # Prepare for function call\n\
+ mov a1,d0\n\
+ call _dl_start,[],0\n\
+_dl_start_user:\n\
+ # Save the user entry point address in d2.\n\
+ mov d0,d2\n\
+ # Point a2 at the GOT.\n\
+0: mov pc,a2\n\
+ add _GLOBAL_OFFSET_TABLE_ - (0b-.),a2\n\
+ # Store the highest stack address\n\
+ mov (__libc_stack_end@GOT,a2),a0\n\
+ mov a1,(a0)\n\
+ # See if we were run as a command with the executable file\n\
+ # name as an extra leading argument.\n\
+ mov (_dl_skip_args@GOT,a2),a0\n\
+ mov (a0),d0\n\
+ # Pop the original argument count.\n\
+ mov (20,sp),d3\n\
+ # Subtract _dl_skip_args from it.\n\
+ sub d0,d3\n\
+ # Adjust the stack pointer to skip _dl_skip_args words.\n\
+ asl2 d0\n\
+ mov sp,a0\n\
+ add d0,a0\n\
+ mov a0,sp\n\
+ # Push argc back on the stack.\n\
+ mov d3,(20,sp)\n\
+ # The special initializer gets called with the stack just\n\
+ # as the application's entry point will see it; it can\n\
+ # switch stacks if it moves these contents over.\n\
+" RTLD_START_SPECIAL_INIT "\n\
+ # Load the parameters again.\n\
+ # (d0, d1, (12,sp), (16,sp)) = (_dl_loaded, argc, argv, envp)\n\
+ add 24,a0\n\
+ mov a0,(12,sp) # a0 is 24+sp\n\
+ mov d3,d1 # d3 contained argc\n\
+ inc d3\n\
+ asl2 d3 # d3 is now (argc+1)*4,\n\
+ add d3,a0 # the offset between argv and envp\n\
+ mov a0,(16,sp)\n\
+ mov (_rtld_local@GOTOFF,a2),d0\n\
+ # Call the function to run the initializers.\n\
+ call _dl_init@PLT,[],0\n\
+ # Pass our finalizer function to the user in d0, as per ELF ABI.\n\
+ mov (_dl_fini@GOT,a2),d0\n\
+ add 20,sp\n\
+ # Jump to the user's entry point.\n\
+ mov d2,a1\n\
+ jmp (a1)\n\
+ .previous\n\
+");
+
+#ifndef RTLD_START_SPECIAL_INIT
+#define RTLD_START_SPECIAL_INIT /* nothing */
+#endif
+
+/* 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_NOCOPY 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_MN10300_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
+ | (((type) == R_MN10300_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_MN10300_JMP_SLOT
+
+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)
+{
+ return *reloc_addr = value;
+}
+
+/* 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 */
+
+#ifdef RESOLVE
+
+/* The mn10300 never uses Elf32_Rel relocations. */
+#define ELF_MACHINE_NO_REL 1
+
+/* 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 Elf32_Rela *reloc,
+ const Elf32_Sym *sym, const struct r_found_version *version,
+ void *const reloc_addr_arg, int skip_ifunc)
+{
+ const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
+ Elf32_Addr value, *reloc_addr;
+
+ /* Make sure we drop any previous alignment assumptions. */
+ asm ("" : "=r" (reloc_addr) : "0" (reloc_addr_arg));
+
+#define COPY_UNALIGNED_WORD(sw, tw, align) \
+ { \
+ unsigned long *__sl = (void*)&(sw), *__tl = (void*)&(tw); \
+ unsigned short *__ss = (void*)&(sw), *__ts = (void*)&(tw); \
+ unsigned char *__sc = (void*)&(sw), *__tc = (void*)&(tw); \
+ switch ((align)) \
+ { \
+ case 0: \
+ *__tl = *__sl; \
+ break; \
+ case 2: \
+ *__ts++ = *__ss++; \
+ *__ts = *__ss; \
+ break; \
+ default: \
+ *__tc++ = *__sc++; \
+ *__tc++ = *__sc++; \
+ *__tc++ = *__sc++; \
+ *__tc = *__sc; \
+ break; \
+ } \
+ }
+
+#define COPY_UNALIGNED_HALFWORD(sw, tw, align) \
+ { \
+ unsigned short *__ss = (void*)&(sw), *__ts = (void*)&(tw); \
+ unsigned char *__sc = (void*)&(sw), *__tc = (void*)&(tw); \
+ switch ((align)) \
+ { \
+ case 0: \
+ *__ts = *__ss; \
+ break; \
+ default: \
+ *__tc++ = *__sc++; \
+ *__tc = *__sc; \
+ break; \
+ } \
+ }
+
+#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
+ if (__builtin_expect (r_type == R_MN10300_RELATIVE, 0))
+ {
+# 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);
+ if (map != &_dl_rtld_map) /* Already done in rtld itself. */
+# endif
+ {
+ COPY_UNALIGNED_WORD (*reloc_addr, value, (int) reloc_addr & 3);
+ value += map->l_addr;
+ COPY_UNALIGNED_WORD (value, *reloc_addr, (int) reloc_addr & 3);
+ }
+ }
+# ifndef RTLD_BOOTSTRAP
+ else if (__builtin_expect (r_type == R_MN10300_NONE, 0))
+ return;
+# endif
+ else
+#endif
+ {
+#ifndef RTLD_BOOTSTRAP
+ const Elf32_Sym *const refsym = sym;
+#endif
+
+ value = RESOLVE (&sym, version, ELF32_R_TYPE (reloc->r_info));
+ if (sym)
+ value += sym->st_value;
+ value += reloc->r_addend; /* Assume copy relocs have zero addend. */
+
+ switch (r_type)
+ {
+#ifndef RTLD_BOOTSTRAP
+ case R_MN10300_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))
+ {
+ extern char **_dl_argv;
+ 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",
+ _dl_argv[0] ?: "<program name unknown>",
+ strtab + refsym->st_name);
+ }
+ memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
+ refsym->st_size));
+ break;
+#endif
+ case R_MN10300_GLOB_DAT:
+ case R_MN10300_JMP_SLOT:
+ /* These addresses are always aligned. */
+ *reloc_addr = value;
+ break;
+ case R_MN10300_32:
+ COPY_UNALIGNED_WORD (value, *reloc_addr, (int) reloc_addr & 3);
+ break;
+#ifndef RTLD_BOOTSTRAP
+ case R_MN10300_16:
+ COPY_UNALIGNED_HALFWORD (value, *reloc_addr, (int) reloc_addr & 1);
+ break;
+ case R_MN10300_8:
+ *(char *) reloc_addr = value;
+ break;
+ case R_MN10300_PCREL32:
+ value -= (Elf32_Addr) reloc_addr;
+ COPY_UNALIGNED_WORD (value, *reloc_addr, (int) reloc_addr & 3);
+ break;
+ case R_MN10300_PCREL16:
+ value -= (Elf32_Addr) reloc_addr;
+ COPY_UNALIGNED_HALFWORD (value, *reloc_addr, (int) reloc_addr & 1);
+ break;
+ case R_MN10300_PCREL8:
+ value -= (Elf32_Addr) reloc_addr;
+ *(char *) reloc_addr = (value - (Elf32_Addr) reloc_addr);
+ break;
+#endif
+ case R_MN10300_NONE: /* Alright, Wilbur. */
+ break;
+#if !defined RTLD_BOOTSTRAP || defined _NDEBUG
+ default:
+ _dl_reloc_bad_type (map, ELFW(R_TYPE) (reloc->r_info), 0);
+ break;
+#endif
+ }
+
+ }
+}
+
+static inline void
+elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
+ void *const reloc_addr_arg)
+{
+ Elf32_Addr value, *reloc_addr;
+
+ asm ("" : "=r" (reloc_addr) : "0" (reloc_addr_arg));
+
+ COPY_UNALIGNED_WORD (*reloc_addr, value, (int)reloc_addr & 3);
+ value += l_addr;
+ COPY_UNALIGNED_WORD (value, *reloc_addr, (int)reloc_addr & 3);
+}
+
+static inline void
+elf_machine_lazy_rel (struct link_map *map,
+ Elf32_Addr l_addr, const Elf32_Rela *reloc,
+ int skip_ifunc)
+{
+ unsigned long int const r_type = ELF32_R_TYPE (reloc->r_info);
+
+ /* Check for unexpected PLT reloc type. */
+ if (__builtin_expect (r_type, R_MN10300_JMP_SLOT) == R_MN10300_JMP_SLOT)
+ {
+ Elf32_Addr* const reloc_addr = (void *)(l_addr + reloc->r_offset);
+ Elf32_Addr value;
+
+ /* Perform a RELATIVE reloc on the .got entry that transfers
+ to the .plt. */
+ COPY_UNALIGNED_WORD (*reloc_addr, value, (int)reloc_addr & 3);
+ value += l_addr;
+ COPY_UNALIGNED_WORD (value, *reloc_addr, (int)reloc_addr & 3);
+ }
+ else if (__builtin_expect (r_type, R_MN10300_NONE) != R_MN10300_NONE)
+ _dl_reloc_bad_type (map, ELFW(R_TYPE) (reloc->r_info), 1);
+
+}
+
+#endif /* RESOLVE */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-30 21:00:06 +0000