--- /dev/null
+/* Machine-dependent ELF dynamic relocation inline functions. ARM version.
+ Copyright (C) 1995, 1996, 1997, 1998 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; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#ifndef dl_machine_h
+#define dl_machine_h
+
+#define ELF_MACHINE_NAME "ARM"
+
+#include <sys/param.h>
+
+#include <assert.h>
+
+/* Return nonzero iff E_MACHINE is compatible with the running host. */
+static inline int __attribute__ ((unused))
+elf_machine_matches_host (Elf32_Half e_machine)
+{
+ switch (e_machine)
+ {
+ case EM_ARM:
+ return 1;
+ default:
+ return 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 __attribute__ ((unused))
+elf_machine_dynamic (void)
+{
+ register Elf32_Addr *got asm ("r10");
+ return *got;
+}
+
+
+/* Return the run-time load address of the shared object. */
+// patb
+static inline Elf32_Addr __attribute__ ((unused))
+elf_machine_load_address (void)
+{
+ Elf32_Addr addr;
+ asm (" ldr ip,.L1
+ ldr r3,.L3
+ add r3, r3, sl
+ ldr ip,[sl, ip]
+ sub ip, r3, ip
+ b .L2
+ .L1: .word _dl_start(GOT)
+ .L3: .word _dl_start(GOTOFF)
+ .L2: mov %0, ip"
+ : "=r" (addr) : : "ip", "r3");
+ return 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__ ((unused))
+elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
+{
+ Elf32_Addr *got;
+ extern void _dl_runtime_resolve (Elf32_Word);
+ extern void _dl_runtime_profile (Elf32_Word);
+
+ if (l->l_info[DT_JMPREL] && lazy)
+ {
+ /* patb: this is different than i386 */
+ /* The GOT entries for functions in the PLT have not yet been filled
+ in. Their initial contents will arrange when called to push an
+ index into the .got section, load ip with &_GLOBAL_OFFSET_TABLE_[3],
+ and then jump to _GLOBAL_OFFSET_TABLE[2]. */
+ got = (Elf32_Addr *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr);
+ 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 (profile)
+ {
+ got[2] = (Elf32_Addr) &_dl_runtime_profile;
+ /* Say that we really want profiling and the timers are started. */
+ _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. */
+ // macro for handling PIC situation....
+#ifdef PIC
+#define CALL_ROUTINE(x) " ldr sl,0f
+ add sl, pc, sl
+1: ldr r2, 2f
+ mov lr, pc
+ add pc, sl, r2
+ b 3f
+0: .word _GLOBAL_OFFSET_TABLE_ - 1b - 4
+2: .word " #x "(GOTOFF)
+3: "
+#else
+#define CALL_ROUTINE(x) " bl " #x
+#endif
+
+#ifndef PROF
+# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
+ .text
+ .globl _dl_runtime_resolve
+ .type _dl_runtime_resolve, #function
+ .align 2
+_dl_runtime_resolve:
+ @ we get called with
+ @ stack[0] contains the return address from this call
+ @ ip contains &GOT[n+3] (pointer to function)
+ @ lr points to &GOT[2]
+
+ @ save almost everything; lr is already on the stack
+ stmdb sp!,{r0-r3,sl,fp}
+
+ @ prepare to call fixup()
+
+ @ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each
+ sub r1, ip, lr
+ sub r1, r1, #4
+ add r1, r1, r1
+
+ @ get pointer to linker struct
+ ldr r0, [lr, #-4]
+
+ " CALL_ROUTINE(fixup) "
+
+ @ save the return
+ mov ip, r0
+
+ @ restore the stack
+ ldmia sp!,{r0-r3,sl,fp,lr}
+
+ @ jump to the newly found address
+ mov pc, ip
+
+ .size _dl_runtime_resolve, .-_dl_runtime_resolve
+
+ .globl _dl_runtime_profile
+ .type _dl_runtime_profile, #function
+ .align 2
+_dl_runtime_profile:
+ @ we get caled with
+ @ stack[0] contains the return address from this call
+ @ ip contains &GOT[n+3] (pointer to function)
+ @ lr points to &GOT[2]
+
+ @ save almost everything; return add is already on the stack
+ stmdb sp!,{r0-r3,fp}
+
+ @ prepare to call fixup()
+
+ @ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each
+ sub r1, ip, lr
+ sub r1, r1, #4
+ add r1, r1, r1
+
+ @ get pointer to linker struct
+ ldr r0, [lr, #-4]
+
+ " CALL_ROUTINE(profile_fixup) "
+
+ @ save the return
+ mov ip, r0
+
+ @ restore the stack
+ ldmia sp!,{r0-r3,fp,lr}
+
+ @ jump to the newly found address
+ mov pc, ip
+
+ .size _dl_runtime_profile, .-_dl_runtime_profile
+ .previous
+");
+#else // PROF
+# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
+ .text
+ .globl _dl_runtime_resolve
+ .globl _dl_runtime_profile
+ .type _dl_runtime_resolve, #function
+ .type _dl_runtime_profile, #function
+ .align 2
+_dl_runtime_resolve:
+_dl_runtime_profile:
+ stmdb sp!,{r0-r3,fp}
+ ldr r1,[sp,#0x34]
+ sub r1, ip, lr
+ sub r1, r1, #4
+ add r1, r1, r1
+ ldr r0, [lr, #-4]
+ " CALL_ROUTINE(fixup) "
+ mov ip, r0
+ ldmia sp!,{r0-r3,fp,lr}
+ mov pc, ip
+
+ .size _dl_runtime_profile, .-_dl_runtime_profile
+ .previous
+");
+#endif //PROF
+
+/* 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 ("\
+.text
+.globl _start
+.globl _dl_start_user
+_start:
+ @ at start time, all the args are on the stack
+ mov r0, sp
+ bl _dl_start
+ @ returns user entry point in r0
+_dl_start_user:
+ mov r6, r0
+ @ we are PIC code, so get global offset table
+ ldr sl, .L_GET_GOT
+ add sl, pc, sl
+.L_GOT_GOT:
+ @ See if we were run as a command with the executable file
+ @ name as an extra leading argument.
+ ldr r1, .L_SKIP_ARGS
+ ldr r1, [sl, r1]
+ @ get the original arg count
+ ldr r0, [sp]
+ @ subtract _dl_skip_args from it
+ sub r0, r0, r1
+ @ adjust the stack pointer to skip them
+ add sp, sp, r1, lsl #2
+ @ store the new argc in the new stack location
+ str r0, [sp]
+
+ @ now we enter a _dl_init_next loop
+ ldr r2, .L_DEF_SCOPE
+ ldr r2, [sl, r2]
+ ldr r4, [r2, #8]
+ @ call _dl_init_next to get the address of an initalizer
+0: mov r0, r4
+ bl _dl_init_next(PLT)
+ cmp r0, #0
+ beq 1f
+ @ call the shared-object initializer
+ @ during this call, the stack may get moved around
+ mov lr, pc
+ mov pc, r0
+ @ go back and look for another initializer
+ b 0b
+1: @ clear the startup flag
+ ldr r2, .L_STARTUP_FLAG
+ ldr r1, [sl, r2]
+ @ we know r0==0 at this point
+ str r0, [r1]
+ @ load the finalizer function
+ ldr r0, .L_FINI_PROC
+ ldr r0, [sl, r0]
+ @ jump to the user_s entry point
+ mov pc, r6
+.L_GET_GOT:
+ .word _GLOBAL_OFFSET_TABLE_ - .L_GOT_GOT - 4 \n\
+.L_SKIP_ARGS: \n\
+ .word _dl_skip_args(GOTOFF) \n\
+.L_DEF_SCOPE: \n\
+ .word _dl_default_scope(GOT) \n\
+.L_STARTUP_FLAG:
+ .word _dl_starting_up(GOT)
+.L_FINI_PROC:
+ .word _dl_fini(GOT)
+.previous\n\
+");
+
+/* Nonzero iff TYPE should not be allowed to resolve to one of
+ the main executable's symbols, as for a COPY reloc. */
+#define elf_machine_lookup_noexec_p(type) ((type) == R_ARM_COPY)
+
+/* Nonzero iff TYPE describes relocation of a PLT entry, so
+ PLT entries should not be allowed to define the value. */
+#define elf_machine_lookup_noplt_p(type) ((type) == R_ARM_JMP_SLOT)
+
+/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
+#define ELF_MACHINE_JMP_SLOT R_ARM_JMP_SLOT
+
+/* The i386 never uses Elf32_Rela relocations. */
+#define ELF_MACHINE_NO_RELA 1
+
+/* We define an initialization functions. This is called very early in
+ _dl_sysdep_start. */
+#define DL_PLATFORM_INIT dl_platform_init ()
+
+extern const char *_dl_platform;
+
+static inline void __attribute__ ((unused))
+dl_platform_init (void)
+{
+ if (_dl_platform == NULL)
+ /* We default to ARM
+ This is where processors could be distinguished arm2, arm6, sa110, etc */
+ _dl_platform = "ARM";
+}
+
+static inline void
+elf_machine_fixup_plt (struct link_map *map, const Elf32_Rel *reloc,
+ Elf32_Addr *reloc_addr, Elf32_Addr value)
+{
+ *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_Rel *reloc,
+ Elf32_Addr value)
+{
+ return value;
+}
+
+#endif /* !dl_machine_h */
+
+#ifdef RESOLVE
+
+extern char **_dl_argv;
+
+/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
+ MAP is the object containing the reloc. */
+
+static inline void
+elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
+ const Elf32_Sym *sym, const struct r_found_version *version,
+ Elf32_Addr *const reloc_addr)
+{
+ if (ELF32_R_TYPE (reloc->r_info) == R_ARM_RELATIVE)
+ {
+#ifndef RTLD_BOOTSTRAP
+ if (map != &_dl_rtld_map) /* Already done in rtld itself. */
+#endif
+ *reloc_addr += map->l_addr;
+ }
+ else if (ELF32_R_TYPE (reloc->r_info) != R_ARM_NONE)
+ {
+ const Elf32_Sym *const refsym = sym;
+ Elf32_Addr value = RESOLVE (&sym, version, ELF32_R_TYPE (reloc->r_info));
+ if (sym)
+ value += sym->st_value;
+
+ switch (ELF32_R_TYPE (reloc->r_info))
+ {
+ case R_ARM_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
+ || (_dl_verbose && sym->st_size < refsym->st_size))
+ {
+ const char *strtab;
+
+ strtab = ((const char *) map->l_addr
+ + map->l_info[DT_STRTAB]->d_un.d_ptr);
+ _dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>",
+ ": Symbol `", strtab + refsym->st_name,
+ "' has different size in shared object, "
+ "consider re-linking\n", NULL);
+ }
+ memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
+ refsym->st_size));
+ break;
+ case R_ARM_GLOB_DAT:
+ case R_ARM_JMP_SLOT:
+
+#if 0
+#define _HEX(i) for (j=28; j>=0; j-=4) b[7-j/4]="0123456789abcdef"[((int)i>>j)&15];
+{
+char b[10];
+int j;
+_HEX(map->l_addr);
+__asm__ (" mov r0, #2; mov r1, %0; mov r2, #9; swi 0x00900004; "
+ : : "r"(b) : "r0", "r1", "r2" );
+_HEX(sym->st_size);
+__asm__ (" mov r0, #2; mov r1, %0; mov r2, #9; swi 0x00900004; "
+ : : "r"(b) : "r0", "r1", "r2" );
+_HEX(&sym->st_value);
+__asm__ (" mov r0, #2; mov r1, %0; mov r2, #9; swi 0x00900004; "
+ : : "r"(b) : "r0", "r1", "r2" );
+_HEX(sym->st_value);
+__asm__ (" mov r0, #2; mov r1, %0; mov r2, #9; swi 0x00900004; "
+ : : "r"(b) : "r0", "r1", "r2" );
+_HEX(sym);
+__asm__ (" mov r0, #2; mov r1, %0; mov r2, #9; swi 0x00900004; "
+ : : "r"(b) : "r0", "r1", "r2" );
+_HEX(reloc_addr);
+__asm__ (" mov r0, #2; mov r1, %0; mov r2, #9; swi 0x00900004; "
+ : : "r"(b) : "r0", "r1", "r2" );
+b[0]=' '; b[1]='\n';
+__asm__ (" mov r0, #2; mov r1, %0; mov r2, #2; swi 0x00900004; "
+ : : "r"(b) : "r0", "r1", "r2" );
+}
+#endif
+ *reloc_addr = value;
+ break;
+ case R_ARM_32:
+ {
+#ifndef RTLD_BOOTSTRAP
+ /* 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)
+ /* Undo the relocation done here during bootstrapping.
+ Now we will relocate it anew, possibly using a
+ binding found in the user program or a loaded library
+ rather than the dynamic linker's built-in definitions
+ used while loading those libraries. */
+ value -= map->l_addr + refsym->st_value;
+#endif
+ *reloc_addr += value;
+ break;
+ }
+ case R_ARM_PC26:
+ *reloc_addr += (value - (Elf32_Addr) reloc_addr);
+ break;
+ default:
+ assert (! "unexpected dynamic reloc type");
+ break;
+ }
+ }
+}
+
+static inline void
+elf_machine_lazy_rel (struct link_map *map, const Elf32_Rel *reloc)
+{
+ Elf32_Addr *const reloc_addr = (void *) (map->l_addr + reloc->r_offset);
+ switch (ELF32_R_TYPE (reloc->r_info))
+ {
+ case R_ARM_JMP_SLOT:
+ *reloc_addr += map->l_addr;
+ break;
+ default:
+ assert (! "unexpected PLT reloc type");
+ break;
+ }
+}
+
+#endif /* RESOLVE */
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