diff options
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/Makefile | 27 | ||||
| -rw-r--r-- | elf/dl-load.c | 12 | ||||
| -rw-r--r-- | elf/dlfcn.h | 11 | ||||
| -rw-r--r-- | elf/elf.h | 4 | ||||
| -rw-r--r-- | elf/rtld.c | 5 |
5 files changed, 46 insertions, 13 deletions
diff --git a/elf/Makefile b/elf/Makefile index ef9207c..269a872 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -20,7 +20,7 @@ subdir := elf -headers = elf.h bits/elfclass.h link.h dlfcn.h +headers = elf.h bits/elfclass.h bits/dlfcn.h link.h dlfcn.h routines = $(dl-routines) dl-open dl-close dl-symbol dl-support \ dl-version enbl-secure @@ -88,6 +88,30 @@ $(objpfx)dl-allobjs.so: $(rtld-routines:%=$(objpfx)%.so) $(objpfx)librtld.so: $(objpfx)dl-allobjs.so $(common-objpfx)libc_pic.a $(reloc-link) '-Wl,-(' $^ -lgcc '-Wl,-)' +# Do we need a linker script? +rtld-ldscript-in := $(firstword $(wildcard $(+sysdep_dirs:%=%/rtld-ldscript.in))) +ifneq (,$(rtld-ldscript-in)) +LDFLAGS-rtld = -T $(objpfx)rtld-ldscript + +before-compile += $(objpfx)rtld-ldscript +rtld-parms = $(wildcard $(+sysdep_dirs:%=%/rtld-parms)) +include $(rtld-parms) +generated += rtld-ldscript +$(objpfx)rtld-ldscript: $(rtld-ldscript-in) $(rtld-parms) + sed -e 's#@@rtld-oformat@@#$(rtld-oformat)#' \ + -e 's#@@rtld-arch@@#$(rtld-arch)#' \ + -e 's#@@rtld-entry@@#$(rtld-entry)#' \ + -e 's#@@rtld-base@@#$(rtld-base)#' $< >$@ + +$(objpfx)ld.so: $(objpfx)librtld.so $(objpfx)rtld-ldscript + $(rtld-link) -Wl,-soname=$(rtld-installed-name) + +define rtld-link +$(LINK.o) -nostdlib -nostartfiles -shared -o $@ \ + -Wl,-rpath=$(default-rpath) $(LDFLAGS-rtld) \ + $(filter-out $(objpfx)rtld-ldscript,$^) +endef +else $(objpfx)ld.so: $(objpfx)librtld.so $(rtld-link) -Wl,-soname=$(rtld-installed-name) @@ -95,6 +119,7 @@ define rtld-link $(LINK.o) -nostdlib -nostartfiles -shared -o $@ \ -Wl,-rpath=$(default-rpath) $^ endef +endif # The dl code in the static libc needs a default library path. CFLAGS-dl-support.c = -D'DEFAULT_RPATH="$(default-rpath)"' diff --git a/elf/dl-load.c b/elf/dl-load.c index 10cc074..8785921 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -44,6 +44,15 @@ #define MAP_COPY MAP_PRIVATE #endif +/* Some systems link their relocatable objects for another base address + than 0. We want to know the base address for these such that we can + subtract this address from the segment addresses during mapping. + This results in a more efficient address space usage. Defaults to + zero for almost all systems. */ +#ifndef MAP_BASE_ADDR +#define MAP_BASE_ADDR(l) 0 +#endif + #include <endian.h> #if BYTE_ORDER == BIG_ENDIAN @@ -335,7 +344,8 @@ _dl_map_object_from_fd (char *name, int fd, char *realname, caddr_t mapat; ElfW(Addr) mappref; size_t maplength = loadcmds[nloadcmds - 1].allocend - c->mapstart; - mappref = ELF_PREFERRED_ADDRESS (loader, maplength, c->mapstart); + mappref = (ELF_PREFERRED_ADDRESS (loader, maplength, c->mapstart) + - MAP_BASE_ADDR (l)); mapat = map_segment (mappref, maplength, c->prot, 0, c->mapoff); l->l_addr = (ElfW(Addr)) mapat - c->mapstart; diff --git a/elf/dlfcn.h b/elf/dlfcn.h index 9b06988..9db5fb4 100644 --- a/elf/dlfcn.h +++ b/elf/dlfcn.h @@ -22,15 +22,8 @@ #include <features.h> -/* The MODE argument to `dlopen' contains one of the following: */ -#define RTLD_LAZY 0x001 /* Lazy function call binding. */ -#define RTLD_NOW 0x002 /* Immediate function call binding. */ -#define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */ - -/* If the following bit is set in the MODE argument to `dlopen', - the symbols of the loaded object and its dependencies are made - visible as if the object were linked directly into the program. */ -#define RTLD_GLOBAL 0x100 +/* Collect various system dependand definitions and declarations. */ +#include <bits/dlfcn.h> /* If the first argument of `dlsym' is set to RTLD_NEXT the run-time address of the symbol called NAME in the next shared object is @@ -741,6 +741,8 @@ typedef struct #define E_MIPS_ARCH_1 0x00000000 /* -mips1 code. */ #define E_MIPS_ARCH_2 0x10000000 /* -mips2 code. */ #define E_MIPS_ARCH_3 0x20000000 /* -mips3 code. */ +#define E_MIPS_ARCH_4 0x30000000 /* -mips4 code. */ +#define E_MIPS_ARCH_5 0x40000000 /* -mips5 code. */ /* Special section indices. */ @@ -810,6 +812,8 @@ typedef struct /* Legal values for p_type field of Elf32_Phdr. */ #define PT_MIPS_REGINFO 0x70000000 /* Register usage information */ +#define PT_MIPS_RTPROC 0x70000001 /* Runtime procedure table. */ +#define PT_MIPS_OPTIONS 0x70000002 /* Legal values for d_tag field of Elf32_Dyn. */ @@ -25,6 +25,7 @@ #include <sys/mman.h> /* Check if MAP_ANON is defined. */ #include <stdio-common/_itoa.h> #include <assert.h> +#include <entry.h> #include "dynamic-link.h" @@ -137,7 +138,7 @@ _dl_start (void *arg) /* Now life is peachy; we can do all normal operations. On to the real work. */ -void _start (void); +void ENTRY_POINT (void); /* Some helper functions. */ @@ -268,7 +269,7 @@ dl_main (const ElfW(Phdr) *phdr, /* Set up a flag which tells we are just starting. */ _dl_starting_up = 1; - if (*user_entry == (ElfW(Addr)) &_start) + if (*user_entry == (ElfW(Addr)) &ENTRY_POINT) { /* Ho ho. We are not the program interpreter! We are the program itself! This means someone ran ld.so as a command. Well, that |