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openwrt/toolchain/uClibc/patches/407-ldso-avr32-2.patch

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Subject: [PATCH] ldso: AVR32 support
This implements the AVR32-specific parts of the dynamic linker.
---
ldso/ldso/avr32/dl-debug.h | 45 +++++++++
ldso/ldso/avr32/dl-startup.h | 110 ++++++++++++++++++++++++
ldso/ldso/avr32/dl-syscalls.h | 5 +
ldso/ldso/avr32/dl-sysdep.h | 103 ++++++++++++++++++++++
ldso/ldso/avr32/elfinterp.c | 191 ++++++++++++++++++++++++++++++++++++++++++
ldso/ldso/avr32/resolve.S | 28 ++++++
6 files changed, 482 insertions(+)
Index: uClibc-0.9.28/ldso/ldso/avr32/dl-debug.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ uClibc-0.9.28/ldso/ldso/avr32/dl-debug.h 2006-05-05 09:30:43.000000000 +0200
@@ -0,0 +1,45 @@
+/*
+ * AVR32 ELF shared libary loader support
+ *
+ * Copyright (C) 2005 Atmel Norway
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. The name of the above contributors may not be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+static const char *_dl_reltypes_tab[] = {
+ "R_AVR32_NONE",
+ "R_AVR32_32", "R_AVR32_16", "R_AVR32_8",
+ "R_AVR32_32_PCREL", "R_AVR32_16_PCREL", "R_AVR32_8_PCREL",
+ "R_AVR32_DIFF32", "R_AVR32_DIFF16", "R_AVR32_DIFF8",
+ "R_AVR32_GOT32", "R_AVR32_GOT16", "R_AVR32_GOT8",
+ "R_AVR32_21S", "R_AVR32_16U", "R_AVR32_16S", "R_AVR32_8S", "R_AVR32_8S_EXT",
+ "R_AVR32_22H_PCREL", "R_AVR32_18W_PCREL", "R_AVR32_16B_PCREL",
+ "R_AVR32_16N_PCREL", "R_AVR32_14UW_PCREL", "R_AVR32_11H_PCREL",
+ "R_AVR32_10UW_PCREL", "R_AVR32_9H_PCREL", "R_AVR32_9UW_PCREL",
+ "R_AVR32_HI16", "R_AVR32_LO16",
+ "R_AVR32_GOTPC", "R_AVR32_GOTCALL", "R_AVR32_LDA_GOT",
+ "R_AVR32_GOT21S", "R_AVR32_GOT18SW", "R_AVR32_GOT16S", "R_AVR32_GOT7UW",
+ "R_AVR32_32_CPENT", "R_AVR32_CPCALL", "R_AVR32_16_CP", "R_AVR32_9W_CP",
+ "R_AVR32_RELATIVE", "R_AVR32_GLOB_DAT", "R_AVR32_JMP_SLOT",
+ "R_AVR32_ALIGN",
+};
Index: uClibc-0.9.28/ldso/ldso/avr32/dl-startup.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ uClibc-0.9.28/ldso/ldso/avr32/dl-startup.h 2006-05-05 09:29:45.000000000 +0200
@@ -0,0 +1,110 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Architecture specific code used by dl-startup.c
+ * Copyright (C) 2005 Atmel Norway
+ */
+
+/* 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"
+
+ " .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
+ * do something a little more subtle here. */
+#define GET_ARGV(ARGVP, ARGS) ARGVP = ((unsigned long *)ARGS + 1)
+
+
+/* We can't call functions before the GOT has been initialized */
+#define NO_FUNCS_BEFORE_BOOTSTRAP
+
+/*
+ * Relocate the GOT during dynamic loader bootstrap. This will add
+ * the load address to all entries in the GOT, which is necessary
+ * because the linker doesn't generate R_AVR32_RELATIVE relocs for the
+ * GOT.
+ */
+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;
+
+ 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)
+{
+ 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
+ * is done. This routine has to exit the current function, then call
+ * the _dl_elf_main function.
+ *
+ * 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;
Index: uClibc-0.9.28/ldso/ldso/avr32/dl-syscalls.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ uClibc-0.9.28/ldso/ldso/avr32/dl-syscalls.h 2006-05-05 09:29:25.000000000 +0200
@@ -0,0 +1,5 @@
+/* We can't use the real errno in ldso, since it has not yet
+ * been dynamicly linked in yet. */
+extern int _dl_errno;
+#define __set_errno(X) {(_dl_errno) = (X);}
+#include "sys/syscall.h"
Index: uClibc-0.9.28/ldso/ldso/avr32/dl-sysdep.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ uClibc-0.9.28/ldso/ldso/avr32/dl-sysdep.h 2006-05-05 09:30:43.000000000 +0200
@@ -0,0 +1,103 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Various assembly language/system dependent hacks that are required
+ * so that we can minimize the amount of platform specific code.
+ * Copyright (C) 2004-2005 Atmel Norway
+ */
+
+/* Define this if the system uses RELOCA. */
+#define ELF_USES_RELOCA
+
+#include <elf.h>
+
+#define ARCH_NUM 1
+#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)
+
+/* 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))
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+#define MAGIC1 EM_AVR32
+#undef MAGIC2
+
+/* Used for error messages */
+#define ELF_TARGET "AVR32"
+
+unsigned long _dl_linux_resolver(unsigned long got_offset, unsigned long *got);
+
+/* 4096 bytes alignment */
+#define PAGE_ALIGN 0xfffff000
+#define ADDR_ALIGN 0xfff
+#define OFFS_ALIGN 0x7ffff000
+
+#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
+
+/* 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
+elf_machine_dynamic (void)
+{
+ 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;
+}
+
+/*
+ * Perform any RELATIVE relocations specified by DT_RELCOUNT.
+ * Currently, we don't use that tag, but we might in the future as
+ * this would reduce the startup time somewhat (although probably not by much).
+ */
+static inline void
+elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr,
+ Elf32_Word relative_count)
+{
+ 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);
+}
Index: uClibc-0.9.28/ldso/ldso/avr32/elfinterp.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ uClibc-0.9.28/ldso/ldso/avr32/elfinterp.c 2006-05-05 09:30:43.000000000 +0200
@@ -0,0 +1,191 @@
+/*
+ * AVR32 ELF shared library loader suppport
+ *
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. The name of the above contributors may not be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+unsigned long _dl_linux_resolver(unsigned long got_offset, unsigned long *got)
+{
+ 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;
+
+#if 0
+ 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;
+
+#if 0
+ new_addr = (unsigned long) _dl_find_hash(strtab + sym->st_name,
+ tpnt->symbol_scope, tpnt,
+ resolver);
+#endif
+
+ entry = (unsigned long *)(got + local_gotno + sym_index - gotsym);
+ *entry = new_addr;
+#endif
+
+ return new_addr;
+}
+
+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))
+{
+ 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];
+
+ for (i = 0; i < rel_size; i++, rpnt++) {
+ int symtab_index, res;
+
+ symtab_index = ELF32_R_SYM(rpnt->r_info);
+
+ debug_sym(symtab, strtab, symtab_index);
+ debug_reloc(symtab, strtab, rpnt);
+
+ res = reloc_func(tpnt, scope, rpnt, symtab, strtab);
+
+ if (res == 0)
+ continue;
+
+ _dl_dprintf(2, "\n%s: ", _dl_progname);
+
+ 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 defined(__SUPPORT_LD_DEBUG__)
+ _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);
+#endif
+ _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)
+{
+ 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;
+#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;
+ }
+ }
+
+#if defined(__SUPPORT_LD_DEBUG__)
+ 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;
+ }
+
+#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);
+#endif
+
+ return 0;
+}
+
+void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
+ unsigned long rel_addr,
+ unsigned long rel_size)
+{
+ /* 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)
+{
+ return _dl_parse(rpnt->dyn, rpnt->dyn->symbol_scope, rel_addr, rel_size,
+ _dl_do_reloc);
+}
Index: uClibc-0.9.28/ldso/ldso/avr32/resolve.S
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ uClibc-0.9.28/ldso/ldso/avr32/resolve.S 2006-05-05 09:29:25.000000000 +0200
@@ -0,0 +1,28 @@
+/*
+ * Linux dynamic resolving code for AVR32. Fixes up the GOT entry as
+ * indicated in register r12 and jumps to the resolved address.
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ *
+ * Copyright (C) 2004 Atmel Norway
+ */
+
+#define ip r5
+
+ .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
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