/* This is the library loader's main entry point. Let _dl_boot2 do its
* initializations and jump to the application's entry point
* afterwards. */
-asm( " .text\n"
- " .global _start\n"
- " .type _start,@function\n"
- "_start:\n"
- /* All arguments are on the stack initially */
- " mov r12, sp\n"
- " rcall _dl_start\n"
- /* Returns user entry point in r12. Save it. */
- " mov r0, r12\n"
- /* We're PIC, so get the Global Offset Table */
- " lddpc r6, .L_GOT\n"
- ".L_RGOT:\n"
- " rsub r6, pc\n"
- /* Adjust argc and argv according to _dl_skip_args */
- " ld.w r1, r6[_dl_skip_args@got]\n"
- " ld.w r1, r1[0]\n"
- " ld.w r2, sp++\n"
- " sub r2, r1\n"
- " add sp, sp, r1 << 2\n"
- " st.w --sp, r2\n"
- /* Load the finalizer function */
- " ld.w r12, r6[_dl_fini@got]\n"
- /* Jump to the user's entry point */
- " mov pc, r0\n\n"
+asm( " .text\n"
+ " .global _start\n"
+ " .type _start,@function\n"
+ "_start:\n"
+ /* All arguments are on the stack initially */
+ " mov r12, sp\n"
+ " rcall _dl_start\n"
+ /* Returns user entry point in r12. Save it. */
+ " mov r0, r12\n"
+ /* We're PIC, so get the Global Offset Table */
+ " lddpc r6, .L_GOT\n"
+ ".L_RGOT:\n"
+ " rsub r6, pc\n"
+ /* Adjust argc and argv according to _dl_skip_args */
+ " ld.w r1, r6[_dl_skip_args@got]\n"
+ " ld.w r1, r1[0]\n"
+ " ld.w r2, sp++\n"
+ " sub r2, r1\n"
+ " add sp, sp, r1 << 2\n"
+ " st.w --sp, r2\n"
+ /* Load the finalizer function */
+ " ld.w r12, r6[_dl_fini@got]\n"
+ /* Jump to the user's entry point */
+ " mov pc, r0\n\n"
- " .align 2\n"
- ".L_GOT:"
- " .long .L_RGOT - _GLOBAL_OFFSET_TABLE_\n"
- " .size _start, . - _start\n"
- " .previous\n");
+ " .align 2\n"
+ ".L_GOT:"
+ " .long .L_RGOT - _GLOBAL_OFFSET_TABLE_\n"
+ " .size _start, . - _start\n"
+ " .previous\n");
/* Get a pointer to the argv array. On many platforms this can be just
* the address if the first argument, on other platforms we need to
static __always_inline
void PERFORM_BOOTSTRAP_GOT(struct elf_resolve *tpnt)
{
- Elf32_Addr i, nr_got;
- register Elf32_Addr *__r6 __asm__("r6");
- Elf32_Addr *got = __r6;
+ Elf32_Addr i, nr_got;
+ register Elf32_Addr *__r6 __asm__("r6");
+ Elf32_Addr *got = __r6;
- nr_got = tpnt->dynamic_info[DT_AVR32_GOTSZ_IDX] / sizeof(*got);
- for (i = 2; i < nr_got; i++)
- got[i] += tpnt->loadaddr;
+ nr_got = tpnt->dynamic_info[DT_AVR32_GOTSZ_IDX] / sizeof(*got);
+ for (i = 2; i < nr_got; i++)
+ got[i] += tpnt->loadaddr;
}
#define PERFORM_BOOTSTRAP_GOT(tpnt) PERFORM_BOOTSTRAP_GOT(tpnt)
/* Handle relocation of the symbols in the dynamic loader. */
static __always_inline
void PERFORM_BOOTSTRAP_RELOC(ELF_RELOC *rpnt, unsigned long *reloc_addr,
- unsigned long symbol_addr,
- unsigned long load_addr, Elf32_Sym *symtab)
+ unsigned long symbol_addr,
+ unsigned long load_addr, Elf32_Sym *symtab)
{
- switch(ELF32_R_TYPE(rpnt->r_info)) {
- case R_AVR32_NONE:
- break;
- case R_AVR32_GLOB_DAT:
- case R_AVR32_JMP_SLOT:
- *reloc_addr = symbol_addr;
- break;
- case R_AVR32_RELATIVE:
- SEND_STDERR_DEBUG("Applying RELATIVE relocation: ");
- SEND_ADDRESS_STDERR_DEBUG(load_addr, 0);
- SEND_STDERR_DEBUG(" + ");
- SEND_ADDRESS_STDERR_DEBUG(rpnt->r_addend, 1);
- *reloc_addr = load_addr + rpnt->r_addend;
- break;
- default:
- SEND_STDERR("BOOTSTRAP_RELOC: unhandled reloc_type ");
- SEND_NUMBER_STDERR(ELF32_R_TYPE(rpnt->r_info), 1);
- SEND_STDERR("REL, SYMBOL, LOAD: ");
- SEND_ADDRESS_STDERR(reloc_addr, 0);
- SEND_STDERR(", ");
- SEND_ADDRESS_STDERR(symbol_addr, 0);
- SEND_STDERR(", ");
- SEND_ADDRESS_STDERR(load_addr, 1);
- _dl_exit(1);
- }
+ switch(ELF32_R_TYPE(rpnt->r_info)) {
+ case R_AVR32_NONE:
+ break;
+ case R_AVR32_GLOB_DAT:
+ case R_AVR32_JMP_SLOT:
+ *reloc_addr = symbol_addr;
+ break;
+ case R_AVR32_RELATIVE:
+ SEND_STDERR_DEBUG("Applying RELATIVE relocation: ");
+ SEND_ADDRESS_STDERR_DEBUG(load_addr, 0);
+ SEND_STDERR_DEBUG(" + ");
+ SEND_ADDRESS_STDERR_DEBUG(rpnt->r_addend, 1);
+ *reloc_addr = load_addr + rpnt->r_addend;
+ break;
+ default:
+ SEND_STDERR("BOOTSTRAP_RELOC: unhandled reloc_type ");
+ SEND_NUMBER_STDERR(ELF32_R_TYPE(rpnt->r_info), 1);
+ SEND_STDERR("REL, SYMBOL, LOAD: ");
+ SEND_ADDRESS_STDERR(reloc_addr, 0);
+ SEND_STDERR(", ");
+ SEND_ADDRESS_STDERR(symbol_addr, 0);
+ SEND_STDERR(", ");
+ SEND_ADDRESS_STDERR(load_addr, 1);
+ _dl_exit(1);
+ }
}
/* Transfer control to the user's application, once the dynamic loader
* Since our _dl_boot will simply call whatever is returned by
* _dl_boot2, we can just return the address we're supposed to
* call. */
-#define START() return _dl_elf_main;
+#define START() return _dl_elf_main;
#include <elf.h>
#define ARCH_NUM 1
-#define DT_AVR32_GOTSZ_IDX (DT_NUM + OS_NUM)
+#define DT_AVR32_GOTSZ_IDX (DT_NUM + OS_NUM)
-#define ARCH_DYNAMIC_INFO(dpnt, dynamic, debug_addr) \
- do { \
- if (dpnt->d_tag == DT_AVR32_GOTSZ) \
- dynamic[DT_AVR32_GOTSZ_IDX] = dpnt->d_un.d_val; \
- } while (0)
+#define ARCH_DYNAMIC_INFO(dpnt, dynamic, debug_addr) \
+ do { \
+ if (dpnt->d_tag == DT_AVR32_GOTSZ) \
+ dynamic[DT_AVR32_GOTSZ_IDX] = dpnt->d_un.d_val; \
+ } while (0)
/* Initialization sequence for the application/library GOT. */
-#define INIT_GOT(GOT_BASE,MODULE) \
- do { \
- unsigned long i, nr_got; \
- \
- GOT_BASE[0] = (unsigned long) _dl_linux_resolve; \
- GOT_BASE[1] = (unsigned long) MODULE; \
- \
- /* Add load address displacement to all GOT entries */ \
- nr_got = MODULE->dynamic_info[DT_AVR32_GOTSZ_IDX] / 4; \
- for (i = 2; i < nr_got; i++) \
- GOT_BASE[i] += (unsigned long)MODULE->loadaddr; \
- } while (0)
-
-#define do_rem(result, n, base) ((result) = (n) % (base))
+#define INIT_GOT(GOT_BASE,MODULE) \
+ do { \
+ unsigned long i, nr_got; \
+ \
+ GOT_BASE[0] = (unsigned long) _dl_linux_resolve; \
+ GOT_BASE[1] = (unsigned long) MODULE; \
+ \
+ /* Add load address displacement to all GOT entries */ \
+ nr_got = MODULE->dynamic_info[DT_AVR32_GOTSZ_IDX] / 4; \
+ for (i = 2; i < nr_got; i++) \
+ GOT_BASE[i] += (unsigned long)MODULE->loadaddr; \
+ } while (0)
+
+#define do_rem(result, n, base) ((result) = (n) % (base))
/* Here we define the magic numbers that this dynamic loader should accept */
#define MAGIC1 EM_AVR32
#define ADDR_ALIGN 0xfff
#define OFFS_ALIGN 0x7ffff000
-#define elf_machine_type_class(type) \
- ((type == R_AVR32_JMP_SLOT) * ELF_RTYPE_CLASS_PLT)
+#define elf_machine_type_class(type) \
+ ((type == R_AVR32_JMP_SLOT) * ELF_RTYPE_CLASS_PLT)
/* AVR32 doesn't need any COPY relocs */
#define DL_NO_COPY_RELOCS
static inline Elf32_Addr
elf_machine_dynamic (void)
{
- register Elf32_Addr *got asm ("r6");
- return *got;
+ register Elf32_Addr *got asm ("r6");
+ return *got;
}
/* Return the run-time load address of the shared object. */
static inline Elf32_Addr
elf_machine_load_address (void)
{
- extern void __dl_start asm("_dl_start");
- Elf32_Addr got_addr = (Elf32_Addr) &__dl_start;
- Elf32_Addr pcrel_addr;
-
- asm (" lddpc %0, 2f\n"
- "1: add %0, pc\n"
- " rjmp 3f\n"
- " .align 2\n"
- "2: .long _dl_start - 1b\n"
- "3:\n"
- : "=r"(pcrel_addr) : : "cc");
-
- return pcrel_addr - got_addr;
+ extern void __dl_start asm("_dl_start");
+ Elf32_Addr got_addr = (Elf32_Addr) &__dl_start;
+ Elf32_Addr pcrel_addr;
+
+ asm (" lddpc %0, 2f\n"
+ "1: add %0, pc\n"
+ " rjmp 3f\n"
+ " .align 2\n"
+ "2: .long _dl_start - 1b\n"
+ "3:\n"
+ : "=r"(pcrel_addr) : : "cc");
+
+ return pcrel_addr - got_addr;
}
/*
*/
static inline void
elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr,
- Elf32_Word relative_count)
+ Elf32_Word relative_count)
{
- Elf32_Rela *rpnt = (void *)rel_addr;
+ Elf32_Rela *rpnt = (void *)rel_addr;
- do {
- Elf32_Addr *reloc_addr;
- reloc_addr = (void *)(load_off + (rpnt++)->r_offset);
- *reloc_addr = load_off + rpnt->r_addend;
- } while (--relative_count);
+ do {
+ Elf32_Addr *reloc_addr;
+ reloc_addr = (void *)(load_off + (rpnt++)->r_offset);
+ *reloc_addr = load_off + rpnt->r_addend;
+ } while (--relative_count);
}
unsigned long _dl_linux_resolver(unsigned long got_offset, unsigned long *got)
{
- /*
- * AVR32 currently does not do lazy relocation.
- */
+ /*
+ * AVR32 currently does not do lazy relocation.
+ */
#if 0
- struct elf_resolve *tpnt = (struct elf_resolve *)got[1];
- Elf32_Sym *sym;
- unsigned long local_gotno;
- unsigned long gotsym;
- unsigned long new_addr;
- char *strtab, *symname;
- unsigned long *entry;
- unsigned long sym_index = got_offset / 4;
-
- local_gotno = tpnt->dynamic_info[DT_AVR32_LOCAL_GOTNO];
- gotsym = tpnt->dynamic_info[DT_AVR32_GOTSYM];
-
- sym = ((Elf32_Sym *)(tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr))
- + sym_index;
- strtab = (char *)(tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
- symname = strtab + sym->st_name;
-
- new_addr = (unsigned long) _dl_find_hash(strtab + sym->st_name,
- tpnt->symbol_scope, tpnt,
- resolver);
-
- entry = (unsigned long *)(got + local_gotno + sym_index - gotsym);
- *entry = new_addr;
-
- return new_addr;
+ struct elf_resolve *tpnt = (struct elf_resolve *)got[1];
+ Elf32_Sym *sym;
+ unsigned long local_gotno;
+ unsigned long gotsym;
+ unsigned long new_addr;
+ char *strtab, *symname;
+ unsigned long *entry;
+ unsigned long sym_index = got_offset / 4;
+
+ local_gotno = tpnt->dynamic_info[DT_AVR32_LOCAL_GOTNO];
+ gotsym = tpnt->dynamic_info[DT_AVR32_GOTSYM];
+
+ sym = ((Elf32_Sym *)(tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr))
+ + sym_index;
+ strtab = (char *)(tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
+ symname = strtab + sym->st_name;
+
+ new_addr = (unsigned long) _dl_find_hash(strtab + sym->st_name,
+ tpnt->symbol_scope, tpnt,
+ resolver);
+
+ entry = (unsigned long *)(got + local_gotno + sym_index - gotsym);
+ *entry = new_addr;
+
+ return new_addr;
#endif
- return 0;
+ return 0;
}
static int
_dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
- unsigned long rel_addr, unsigned long rel_size,
- int (*reloc_func)(struct elf_resolve *tpnt, struct dyn_elf *scope,
- Elf32_Rela *rpnt, Elf32_Sym *symtab, char *strtab))
+ unsigned long rel_addr, unsigned long rel_size,
+ int (*reloc_func)(struct elf_resolve *tpnt, struct dyn_elf *scope,
+ Elf32_Rela *rpnt, Elf32_Sym *symtab, char *strtab))
{
- Elf32_Sym *symtab;
- Elf32_Rela *rpnt;
- char *strtab;
- int i;
+ Elf32_Sym *symtab;
+ Elf32_Rela *rpnt;
+ char *strtab;
+ int i;
- rpnt = (Elf32_Rela *)rel_addr;
- rel_size /= sizeof(Elf32_Rela);
- symtab = (Elf32_Sym *)tpnt->dynamic_info[DT_SYMTAB];
- strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
+ rpnt = (Elf32_Rela *)rel_addr;
+ rel_size /= sizeof(Elf32_Rela);
+ symtab = (Elf32_Sym *)tpnt->dynamic_info[DT_SYMTAB];
+ strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
- for (i = 0; i < rel_size; i++, rpnt++) {
- int symtab_index, res;
+ for (i = 0; i < rel_size; i++, rpnt++) {
+ int symtab_index, res;
- symtab_index = ELF32_R_SYM(rpnt->r_info);
+ symtab_index = ELF32_R_SYM(rpnt->r_info);
- debug_sym(symtab, strtab, symtab_index);
- debug_reloc(symtab, strtab, rpnt);
+ debug_sym(symtab, strtab, symtab_index);
+ debug_reloc(symtab, strtab, rpnt);
- res = reloc_func(tpnt, scope, rpnt, symtab, strtab);
+ res = reloc_func(tpnt, scope, rpnt, symtab, strtab);
- if (res == 0)
- continue;
+ if (res == 0)
+ continue;
- _dl_dprintf(2, "\n%s: ", _dl_progname);
+ _dl_dprintf(2, "\n%s: ", _dl_progname);
- if (symtab_index)
- _dl_dprintf(2, "symbol '%s': ",
- strtab + symtab[symtab_index].st_name);
+ if (symtab_index)
+ _dl_dprintf(2, "symbol '%s': ",
+ strtab + symtab[symtab_index].st_name);
- if (res < 0) {
- int reloc_type = ELF32_R_TYPE(rpnt->r_info);
+ if (res < 0) {
+ int reloc_type = ELF32_R_TYPE(rpnt->r_info);
#if defined(__SUPPORT_LD_DEBUG__)
- _dl_dprintf(2, "can't handle reloc type %s\n",
- _dl_reltypes(reloc_type));
+ _dl_dprintf(2, "can't handle reloc type %s\n",
+ _dl_reltypes(reloc_type));
#else
- _dl_dprintf(2, "can't handle reloc type %x\n",
- reloc_type);
+ _dl_dprintf(2, "can't handle reloc type %x\n",
+ reloc_type);
#endif
- _dl_exit(-res);
- } else {
- _dl_dprintf(2, "can't resolve symbol\n");
- return res;
- }
- }
-
- return 0;
+ _dl_exit(-res);
+ } else {
+ _dl_dprintf(2, "can't resolve symbol\n");
+ return res;
+ }
+ }
+
+ return 0;
}
static int _dl_do_reloc(struct elf_resolve *tpnt, struct dyn_elf *scope,
- Elf32_Rela *rpnt, Elf32_Sym *symtab, char *strtab)
+ Elf32_Rela *rpnt, Elf32_Sym *symtab, char *strtab)
{
- int reloc_type;
- int symtab_index;
- char *symname;
- unsigned long *reloc_addr;
- unsigned long symbol_addr;
+ int reloc_type;
+ int symtab_index;
+ char *symname;
+ unsigned long *reloc_addr;
+ unsigned long symbol_addr;
#if defined(__SUPPORT_LD_DEBUG__)
- unsigned long old_val;
+ unsigned long old_val;
#endif
- reloc_addr = (unsigned long *)(tpnt->loadaddr + rpnt->r_offset);
- reloc_type = ELF32_R_TYPE(rpnt->r_info);
- symtab_index = ELF32_R_SYM(rpnt->r_info);
- symbol_addr = 0;
- symname = strtab + symtab[symtab_index].st_name;
-
- if (symtab_index) {
- symbol_addr = (unsigned long)
- _dl_find_hash(strtab + symtab[symtab_index].st_name,
- tpnt->symbol_scope, tpnt,
- elf_machine_type_class(reloc_type));
-
- /* Allow undefined references to weak symbols */
- if (!symbol_addr &&
- ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK) {
- _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
- _dl_progname, symname);
- return 0;
- }
- }
+ reloc_addr = (unsigned long *)(tpnt->loadaddr + rpnt->r_offset);
+ reloc_type = ELF32_R_TYPE(rpnt->r_info);
+ symtab_index = ELF32_R_SYM(rpnt->r_info);
+ symbol_addr = 0;
+ symname = strtab + symtab[symtab_index].st_name;
+
+ if (symtab_index) {
+ symbol_addr = (unsigned long)
+ _dl_find_hash(strtab + symtab[symtab_index].st_name,
+ tpnt->symbol_scope, tpnt,
+ elf_machine_type_class(reloc_type));
+
+ /* Allow undefined references to weak symbols */
+ if (!symbol_addr &&
+ ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK) {
+ _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
+ _dl_progname, symname);
+ return 0;
+ }
+ }
#if defined(__SUPPORT_LD_DEBUG__)
- old_val = *reloc_addr;
+ old_val = *reloc_addr;
#endif
- switch (reloc_type) {
- case R_AVR32_NONE:
- break;
- case R_AVR32_GLOB_DAT:
- case R_AVR32_JMP_SLOT:
- *reloc_addr = symbol_addr + rpnt->r_addend;
- break;
- case R_AVR32_RELATIVE:
- *reloc_addr = (unsigned long)tpnt->loadaddr
- + rpnt->r_addend;
- break;
- default:
- return -1;
- }
+ switch (reloc_type) {
+ case R_AVR32_NONE:
+ break;
+ case R_AVR32_GLOB_DAT:
+ case R_AVR32_JMP_SLOT:
+ *reloc_addr = symbol_addr + rpnt->r_addend;
+ break;
+ case R_AVR32_RELATIVE:
+ *reloc_addr = (unsigned long)tpnt->loadaddr
+ + rpnt->r_addend;
+ break;
+ default:
+ return -1;
+ }
#if defined(__SUPPORT_LD_DEBUG__)
- if (_dl_debug_reloc && _dl_debug_detail)
- _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n",
- old_val, *reloc_addr);
+ if (_dl_debug_reloc && _dl_debug_detail)
+ _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n",
+ old_val, *reloc_addr);
#endif
- return 0;
+ return 0;
}
void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
- unsigned long rel_addr,
- unsigned long rel_size)
+ unsigned long rel_addr,
+ unsigned long rel_size)
{
- /* TODO: Might want to support this in order to get faster
- * startup times... */
+ /* TODO: Might want to support this in order to get faster
+ * startup times... */
}
int _dl_parse_relocation_information(struct dyn_elf *rpnt,
- unsigned long rel_addr,
- unsigned long rel_size)
+ unsigned long rel_addr,
+ unsigned long rel_size)
{
- return _dl_parse(rpnt->dyn, rpnt->dyn->symbol_scope, rel_addr, rel_size,
- _dl_do_reloc);
+ return _dl_parse(rpnt->dyn, rpnt->dyn->symbol_scope, rel_addr, rel_size,
+ _dl_do_reloc);
}
#define ip r5
- .text
- .global _dl_linux_resolve
- .type _dl_linux_resolve,@function
+ .text
+ .global _dl_linux_resolve
+ .type _dl_linux_resolve,@function
_dl_linux_resolve:
- /* The PLT code pushed r8 for us. It contains the address of this
- function's GOT entry, that is entry 0. ip contains the address
- of the GOT entry of the function we wanted to call. */
- stm --sp, r9-r12, lr
- mov r11, r8
- sub r12, ip, r8
- rcall _dl_linux_resolver
- mov ip, r12
- popm r8-r12,lr
- mov pc, ip
- .size _dl_linux_resolve, . - _dl_linux_resolve
+ /* The PLT code pushed r8 for us. It contains the address of this
+ function's GOT entry, that is entry 0. ip contains the address
+ of the GOT entry of the function we wanted to call. */
+ stm --sp, r9-r12, lr
+ mov r11, r8
+ sub r12, ip, r8
+ rcall _dl_linux_resolver
+ mov ip, r12
+ popm r8-r12,lr
+ mov pc, ip
+ .size _dl_linux_resolve, . - _dl_linux_resolve
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