root / linux-user / elfload.c @ e80cfcfc
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/* This is the Linux kernel elf-loading code, ported into user space */
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#include <stdio.h> |
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#include <sys/types.h> |
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#include <fcntl.h> |
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#include <sys/stat.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include <sys/mman.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "qemu.h" |
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#include "disas.h" |
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/* this flag is uneffective under linux too, should be deleted */
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#ifndef MAP_DENYWRITE
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#define MAP_DENYWRITE 0 |
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#endif
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/* should probably go in elf.h */
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#ifndef ELIBBAD
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#define ELIBBAD 80 |
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#endif
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#ifdef TARGET_I386
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#define ELF_START_MMAP 0x80000000 |
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/*
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* This is used to ensure we don't load something for the wrong architecture.
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*/
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#define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
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/*
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* These are used to set parameters in the core dumps.
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*/
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#define ELF_CLASS ELFCLASS32
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#define ELF_DATA ELFDATA2LSB
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#define ELF_ARCH EM_386
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/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
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starts %edx contains a pointer to a function which might be
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registered using `atexit'. This provides a mean for the
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dynamic linker to call DT_FINI functions for shared libraries
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that have been loaded before the code runs.
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A value of 0 tells we have no such handler. */
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#define ELF_PLAT_INIT(_r) _r->edx = 0 |
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static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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{
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regs->esp = infop->start_stack; |
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regs->eip = infop->entry; |
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} |
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#define USE_ELF_CORE_DUMP
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#define ELF_EXEC_PAGESIZE 4096 |
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#endif
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#ifdef TARGET_ARM
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#define ELF_START_MMAP 0x80000000 |
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#define elf_check_arch(x) ( (x) == EM_ARM )
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#define ELF_CLASS ELFCLASS32
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#ifdef TARGET_WORDS_BIGENDIAN
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#define ELF_DATA ELFDATA2MSB
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#else
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#define ELF_DATA ELFDATA2LSB
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#endif
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#define ELF_ARCH EM_ARM
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#define ELF_PLAT_INIT(_r) _r->ARM_r0 = 0 |
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static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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{
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target_long *stack = (void *)infop->start_stack;
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memset(regs, 0, sizeof(*regs)); |
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regs->ARM_cpsr = 0x10;
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regs->ARM_pc = infop->entry; |
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regs->ARM_sp = infop->start_stack; |
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regs->ARM_r2 = tswapl(stack[2]); /* envp */ |
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regs->ARM_r1 = tswapl(stack[1]); /* argv */ |
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/* XXX: it seems that r0 is zeroed after ! */
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// regs->ARM_r0 = tswapl(stack[0]); /* argc */
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} |
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#define USE_ELF_CORE_DUMP
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#define ELF_EXEC_PAGESIZE 4096 |
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#endif
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#ifdef TARGET_SPARC
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#define ELF_START_MMAP 0x80000000 |
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#define elf_check_arch(x) ( (x) == EM_SPARC )
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#define ELF_CLASS ELFCLASS32
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#define ELF_DATA ELFDATA2MSB
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#define ELF_ARCH EM_SPARC
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/*XXX*/
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#define ELF_PLAT_INIT(_r)
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static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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{
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regs->psr = 0;
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regs->pc = infop->entry; |
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regs->npc = regs->pc + 4;
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regs->y = 0;
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regs->u_regs[14] = infop->start_stack - 16 * 4; |
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} |
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#endif
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#ifdef TARGET_PPC
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#define ELF_START_MMAP 0x80000000 |
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#define elf_check_arch(x) ( (x) == EM_PPC )
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#define ELF_CLASS ELFCLASS32
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#ifdef TARGET_WORDS_BIGENDIAN
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#define ELF_DATA ELFDATA2MSB
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#else
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#define ELF_DATA ELFDATA2LSB
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#endif
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#define ELF_ARCH EM_PPC
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/* Note that isn't exactly what regular kernel does
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* but this is what the ABI wants and is needed to allow
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* execution of PPC BSD programs.
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*/
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#define ELF_PLAT_INIT(_r) \
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do { \
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target_ulong *pos = (target_ulong *)bprm->p, tmp = 1; \
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_r->gpr[3] = bprm->argc; \
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_r->gpr[4] = (unsigned long)++pos; \ |
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for (; tmp != 0; pos++) \ |
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tmp = *pos; \ |
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_r->gpr[5] = (unsigned long)pos; \ |
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} while (0) |
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/*
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* We need to put in some extra aux table entries to tell glibc what
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* the cache block size is, so it can use the dcbz instruction safely.
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*/
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#define AT_DCACHEBSIZE 19 |
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#define AT_ICACHEBSIZE 20 |
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#define AT_UCACHEBSIZE 21 |
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/* A special ignored type value for PPC, for glibc compatibility. */
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#define AT_IGNOREPPC 22 |
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/*
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* The requirements here are:
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* - keep the final alignment of sp (sp & 0xf)
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* - make sure the 32-bit value at the first 16 byte aligned position of
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* AUXV is greater than 16 for glibc compatibility.
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* AT_IGNOREPPC is used for that.
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* - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
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* even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
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*/
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#define DLINFO_ARCH_ITEMS 3 |
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#define ARCH_DLINFO \
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do { \
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sp -= DLINFO_ARCH_ITEMS * 2; \
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NEW_AUX_ENT(0, AT_DCACHEBSIZE, 0x20); \ |
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NEW_AUX_ENT(1, AT_ICACHEBSIZE, 0x20); \ |
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NEW_AUX_ENT(2, AT_UCACHEBSIZE, 0); \ |
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/* \
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* Now handle glibc compatibility. \
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*/ \
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sp -= 2*2; \ |
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NEW_AUX_ENT(0, AT_IGNOREPPC, AT_IGNOREPPC); \
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NEW_AUX_ENT(1, AT_IGNOREPPC, AT_IGNOREPPC); \
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} while (0) |
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static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop) |
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{
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_regs->msr = 1 << MSR_PR; /* Set user mode */ |
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_regs->gpr[1] = infop->start_stack;
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_regs->nip = infop->entry; |
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} |
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#define USE_ELF_CORE_DUMP
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#define ELF_EXEC_PAGESIZE 4096 |
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#endif
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#include "elf.h" |
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/*
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* MAX_ARG_PAGES defines the number of pages allocated for arguments
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* and envelope for the new program. 32 should suffice, this gives
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* a maximum env+arg of 128kB w/4KB pages!
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*/
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#define MAX_ARG_PAGES 32 |
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/*
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* This structure is used to hold the arguments that are
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* used when loading binaries.
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*/
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struct linux_binprm {
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char buf[128]; |
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unsigned long page[MAX_ARG_PAGES]; |
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unsigned long p; |
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int sh_bang;
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int fd;
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int e_uid, e_gid;
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int argc, envc;
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char * filename; /* Name of binary */ |
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unsigned long loader, exec; |
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int dont_iput; /* binfmt handler has put inode */ |
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}; |
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struct exec
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{
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unsigned int a_info; /* Use macros N_MAGIC, etc for access */ |
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unsigned int a_text; /* length of text, in bytes */ |
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unsigned int a_data; /* length of data, in bytes */ |
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unsigned int a_bss; /* length of uninitialized data area, in bytes */ |
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unsigned int a_syms; /* length of symbol table data in file, in bytes */ |
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unsigned int a_entry; /* start address */ |
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unsigned int a_trsize; /* length of relocation info for text, in bytes */ |
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unsigned int a_drsize; /* length of relocation info for data, in bytes */ |
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}; |
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#define N_MAGIC(exec) ((exec).a_info & 0xffff) |
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#define OMAGIC 0407 |
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#define NMAGIC 0410 |
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#define ZMAGIC 0413 |
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#define QMAGIC 0314 |
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/* max code+data+bss space allocated to elf interpreter */
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#define INTERP_MAP_SIZE (32 * 1024 * 1024) |
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/* max code+data+bss+brk space allocated to ET_DYN executables */
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#define ET_DYN_MAP_SIZE (128 * 1024 * 1024) |
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/* from personality.h */
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/* Flags for bug emulation. These occupy the top three bytes. */
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#define STICKY_TIMEOUTS 0x4000000 |
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#define WHOLE_SECONDS 0x2000000 |
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/* Personality types. These go in the low byte. Avoid using the top bit,
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* it will conflict with error returns.
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*/
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#define PER_MASK (0x00ff) |
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#define PER_LINUX (0x0000) |
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#define PER_SVR4 (0x0001 | STICKY_TIMEOUTS) |
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#define PER_SVR3 (0x0002 | STICKY_TIMEOUTS) |
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#define PER_SCOSVR3 (0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS) |
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#define PER_WYSEV386 (0x0004 | STICKY_TIMEOUTS) |
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#define PER_ISCR4 (0x0005 | STICKY_TIMEOUTS) |
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#define PER_BSD (0x0006) |
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#define PER_XENIX (0x0007 | STICKY_TIMEOUTS) |
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/* Necessary parameters */
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#define NGROUPS 32 |
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#define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
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#define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1)) |
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#define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1)) |
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#define INTERPRETER_NONE 0 |
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#define INTERPRETER_AOUT 1 |
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#define INTERPRETER_ELF 2 |
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#define DLINFO_ITEMS 11 |
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static inline void memcpy_fromfs(void * to, const void * from, unsigned long n) |
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{
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memcpy(to, from, n); |
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} |
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extern unsigned long x86_stack_size; |
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static int load_aout_interp(void * exptr, int interp_fd); |
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#ifdef BSWAP_NEEDED
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static void bswap_ehdr(Elf32_Ehdr *ehdr) |
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{
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bswap16s(&ehdr->e_type); /* Object file type */
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bswap16s(&ehdr->e_machine); /* Architecture */
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bswap32s(&ehdr->e_version); /* Object file version */
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bswap32s(&ehdr->e_entry); /* Entry point virtual address */
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bswap32s(&ehdr->e_phoff); /* Program header table file offset */
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bswap32s(&ehdr->e_shoff); /* Section header table file offset */
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bswap32s(&ehdr->e_flags); /* Processor-specific flags */
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bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
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bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
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bswap16s(&ehdr->e_phnum); /* Program header table entry count */
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bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
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bswap16s(&ehdr->e_shnum); /* Section header table entry count */
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bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
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} |
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static void bswap_phdr(Elf32_Phdr *phdr) |
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{
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bswap32s(&phdr->p_type); /* Segment type */
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bswap32s(&phdr->p_offset); /* Segment file offset */
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bswap32s(&phdr->p_vaddr); /* Segment virtual address */
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bswap32s(&phdr->p_paddr); /* Segment physical address */
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bswap32s(&phdr->p_filesz); /* Segment size in file */
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bswap32s(&phdr->p_memsz); /* Segment size in memory */
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bswap32s(&phdr->p_flags); /* Segment flags */
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bswap32s(&phdr->p_align); /* Segment alignment */
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} |
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static void bswap_shdr(Elf32_Shdr *shdr) |
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{
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bswap32s(&shdr->sh_name); |
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bswap32s(&shdr->sh_type); |
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bswap32s(&shdr->sh_flags); |
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bswap32s(&shdr->sh_addr); |
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bswap32s(&shdr->sh_offset); |
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bswap32s(&shdr->sh_size); |
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bswap32s(&shdr->sh_link); |
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bswap32s(&shdr->sh_info); |
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bswap32s(&shdr->sh_addralign); |
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bswap32s(&shdr->sh_entsize); |
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} |
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static void bswap_sym(Elf32_Sym *sym) |
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{
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bswap32s(&sym->st_name); |
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bswap32s(&sym->st_value); |
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bswap32s(&sym->st_size); |
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bswap16s(&sym->st_shndx); |
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} |
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#endif
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static void * get_free_page(void) |
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{
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void * retval;
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/* User-space version of kernel get_free_page. Returns a page-aligned
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* page-sized chunk of memory.
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*/
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retval = (void *)target_mmap(0, qemu_host_page_size, PROT_READ|PROT_WRITE, |
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MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
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if((long)retval == -1) { |
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perror("get_free_page");
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exit(-1);
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} |
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else {
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return(retval);
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} |
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} |
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|
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static void free_page(void * pageaddr) |
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{
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target_munmap((unsigned long)pageaddr, qemu_host_page_size); |
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} |
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|
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/*
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* 'copy_string()' copies argument/envelope strings from user
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* memory to free pages in kernel mem. These are in a format ready
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* to be put directly into the top of new user memory.
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*
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*/
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static unsigned long copy_strings(int argc,char ** argv,unsigned long *page, |
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unsigned long p) |
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{
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char *tmp, *tmp1, *pag = NULL; |
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int len, offset = 0; |
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|
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if (!p) {
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return 0; /* bullet-proofing */ |
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} |
| 377 |
while (argc-- > 0) { |
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tmp = argv[argc]; |
| 379 |
if (!tmp) {
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fprintf(stderr, "VFS: argc is wrong");
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exit(-1);
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} |
| 383 |
tmp1 = tmp; |
| 384 |
while (*tmp++);
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len = tmp - tmp1; |
| 386 |
if (p < len) { /* this shouldn't happen - 128kB */ |
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return 0; |
| 388 |
} |
| 389 |
while (len) {
|
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--p; --tmp; --len; |
| 391 |
if (--offset < 0) { |
| 392 |
offset = p % TARGET_PAGE_SIZE; |
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pag = (char *) page[p/TARGET_PAGE_SIZE];
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if (!pag) {
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pag = (char *)get_free_page();
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page[p/TARGET_PAGE_SIZE] = (unsigned long)pag; |
| 397 |
if (!pag)
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return 0; |
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} |
| 400 |
} |
| 401 |
if (len == 0 || offset == 0) { |
| 402 |
*(pag + offset) = *tmp; |
| 403 |
} |
| 404 |
else {
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int bytes_to_copy = (len > offset) ? offset : len;
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tmp -= bytes_to_copy; |
| 407 |
p -= bytes_to_copy; |
| 408 |
offset -= bytes_to_copy; |
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len -= bytes_to_copy; |
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memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1);
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} |
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} |
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} |
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return p;
|
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} |
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|
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static int in_group_p(gid_t g) |
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{
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/* return TRUE if we're in the specified group, FALSE otherwise */
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int ngroup;
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| 421 |
int i;
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gid_t grouplist[NGROUPS]; |
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ngroup = getgroups(NGROUPS, grouplist); |
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for(i = 0; i < ngroup; i++) { |
| 426 |
if(grouplist[i] == g) {
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return 1; |
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} |
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} |
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return 0; |
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} |
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|
| 433 |
static int count(char ** vec) |
| 434 |
{
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| 435 |
int i;
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| 436 |
|
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for(i = 0; *vec; i++) { |
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vec++; |
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} |
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return(i);
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} |
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|
| 444 |
static int prepare_binprm(struct linux_binprm *bprm) |
| 445 |
{
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| 446 |
struct stat st;
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| 447 |
int mode;
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| 448 |
int retval, id_change;
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| 449 |
|
| 450 |
if(fstat(bprm->fd, &st) < 0) { |
| 451 |
return(-errno);
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} |
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|
| 454 |
mode = st.st_mode; |
| 455 |
if(!S_ISREG(mode)) { /* Must be regular file */ |
| 456 |
return(-EACCES);
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} |
| 458 |
if(!(mode & 0111)) { /* Must have at least one execute bit set */ |
| 459 |
return(-EACCES);
|
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} |
| 461 |
|
| 462 |
bprm->e_uid = geteuid(); |
| 463 |
bprm->e_gid = getegid(); |
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id_change = 0;
|
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|
| 466 |
/* Set-uid? */
|
| 467 |
if(mode & S_ISUID) {
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bprm->e_uid = st.st_uid; |
| 469 |
if(bprm->e_uid != geteuid()) {
|
| 470 |
id_change = 1;
|
| 471 |
} |
| 472 |
} |
| 473 |
|
| 474 |
/* Set-gid? */
|
| 475 |
/*
|
| 476 |
* If setgid is set but no group execute bit then this
|
| 477 |
* is a candidate for mandatory locking, not a setgid
|
| 478 |
* executable.
|
| 479 |
*/
|
| 480 |
if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
|
| 481 |
bprm->e_gid = st.st_gid; |
| 482 |
if (!in_group_p(bprm->e_gid)) {
|
| 483 |
id_change = 1;
|
| 484 |
} |
| 485 |
} |
| 486 |
|
| 487 |
memset(bprm->buf, 0, sizeof(bprm->buf)); |
| 488 |
retval = lseek(bprm->fd, 0L, SEEK_SET);
|
| 489 |
if(retval >= 0) { |
| 490 |
retval = read(bprm->fd, bprm->buf, 128);
|
| 491 |
} |
| 492 |
if(retval < 0) { |
| 493 |
perror("prepare_binprm");
|
| 494 |
exit(-1);
|
| 495 |
/* return(-errno); */
|
| 496 |
} |
| 497 |
else {
|
| 498 |
return(retval);
|
| 499 |
} |
| 500 |
} |
| 501 |
|
| 502 |
unsigned long setup_arg_pages(unsigned long p, struct linux_binprm * bprm, |
| 503 |
struct image_info * info)
|
| 504 |
{
|
| 505 |
unsigned long stack_base, size, error; |
| 506 |
int i;
|
| 507 |
|
| 508 |
/* Create enough stack to hold everything. If we don't use
|
| 509 |
* it for args, we'll use it for something else...
|
| 510 |
*/
|
| 511 |
size = x86_stack_size; |
| 512 |
if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE)
|
| 513 |
size = MAX_ARG_PAGES*TARGET_PAGE_SIZE; |
| 514 |
error = target_mmap(0,
|
| 515 |
size + qemu_host_page_size, |
| 516 |
PROT_READ | PROT_WRITE, |
| 517 |
MAP_PRIVATE | MAP_ANONYMOUS, |
| 518 |
-1, 0); |
| 519 |
if (error == -1) { |
| 520 |
perror("stk mmap");
|
| 521 |
exit(-1);
|
| 522 |
} |
| 523 |
/* we reserve one extra page at the top of the stack as guard */
|
| 524 |
target_mprotect(error + size, qemu_host_page_size, PROT_NONE); |
| 525 |
|
| 526 |
stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE; |
| 527 |
p += stack_base; |
| 528 |
|
| 529 |
if (bprm->loader) {
|
| 530 |
bprm->loader += stack_base; |
| 531 |
} |
| 532 |
bprm->exec += stack_base; |
| 533 |
|
| 534 |
for (i = 0 ; i < MAX_ARG_PAGES ; i++) { |
| 535 |
if (bprm->page[i]) {
|
| 536 |
info->rss++; |
| 537 |
|
| 538 |
memcpy((void *)stack_base, (void *)bprm->page[i], TARGET_PAGE_SIZE); |
| 539 |
free_page((void *)bprm->page[i]);
|
| 540 |
} |
| 541 |
stack_base += TARGET_PAGE_SIZE; |
| 542 |
} |
| 543 |
return p;
|
| 544 |
} |
| 545 |
|
| 546 |
static void set_brk(unsigned long start, unsigned long end) |
| 547 |
{
|
| 548 |
/* page-align the start and end addresses... */
|
| 549 |
start = HOST_PAGE_ALIGN(start); |
| 550 |
end = HOST_PAGE_ALIGN(end); |
| 551 |
if (end <= start)
|
| 552 |
return;
|
| 553 |
if(target_mmap(start, end - start,
|
| 554 |
PROT_READ | PROT_WRITE | PROT_EXEC, |
| 555 |
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) { |
| 556 |
perror("cannot mmap brk");
|
| 557 |
exit(-1);
|
| 558 |
} |
| 559 |
} |
| 560 |
|
| 561 |
|
| 562 |
/* We need to explicitly zero any fractional pages after the data
|
| 563 |
section (i.e. bss). This would contain the junk from the file that
|
| 564 |
should not be in memory. */
|
| 565 |
static void padzero(unsigned long elf_bss) |
| 566 |
{
|
| 567 |
unsigned long nbyte; |
| 568 |
char * fpnt;
|
| 569 |
|
| 570 |
/* XXX: this is really a hack : if the real host page size is
|
| 571 |
smaller than the target page size, some pages after the end
|
| 572 |
of the file may not be mapped. A better fix would be to
|
| 573 |
patch target_mmap(), but it is more complicated as the file
|
| 574 |
size must be known */
|
| 575 |
if (qemu_real_host_page_size < qemu_host_page_size) {
|
| 576 |
unsigned long end_addr, end_addr1; |
| 577 |
end_addr1 = (elf_bss + qemu_real_host_page_size - 1) &
|
| 578 |
~(qemu_real_host_page_size - 1);
|
| 579 |
end_addr = HOST_PAGE_ALIGN(elf_bss); |
| 580 |
if (end_addr1 < end_addr) {
|
| 581 |
mmap((void *)end_addr1, end_addr - end_addr1,
|
| 582 |
PROT_READ|PROT_WRITE|PROT_EXEC, |
| 583 |
MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
| 584 |
} |
| 585 |
} |
| 586 |
|
| 587 |
nbyte = elf_bss & (qemu_host_page_size-1);
|
| 588 |
if (nbyte) {
|
| 589 |
nbyte = qemu_host_page_size - nbyte; |
| 590 |
fpnt = (char *) elf_bss;
|
| 591 |
do {
|
| 592 |
*fpnt++ = 0;
|
| 593 |
} while (--nbyte);
|
| 594 |
} |
| 595 |
} |
| 596 |
|
| 597 |
static unsigned int * create_elf_tables(char *p, int argc, int envc, |
| 598 |
struct elfhdr * exec,
|
| 599 |
unsigned long load_addr, |
| 600 |
unsigned long load_bias, |
| 601 |
unsigned long interp_load_addr, int ibcs, |
| 602 |
struct image_info *info)
|
| 603 |
{
|
| 604 |
target_ulong *argv, *envp; |
| 605 |
target_ulong *sp, *csp; |
| 606 |
int v;
|
| 607 |
|
| 608 |
/*
|
| 609 |
* Force 16 byte _final_ alignment here for generality.
|
| 610 |
*/
|
| 611 |
sp = (unsigned int *) (~15UL & (unsigned long) p); |
| 612 |
csp = sp; |
| 613 |
csp -= (DLINFO_ITEMS + 1) * 2; |
| 614 |
#ifdef DLINFO_ARCH_ITEMS
|
| 615 |
csp -= DLINFO_ARCH_ITEMS*2;
|
| 616 |
#endif
|
| 617 |
csp -= envc+1;
|
| 618 |
csp -= argc+1;
|
| 619 |
csp -= (!ibcs ? 3 : 1); /* argc itself */ |
| 620 |
if ((unsigned long)csp & 15UL) |
| 621 |
sp -= ((unsigned long)csp & 15UL) / sizeof(*sp); |
| 622 |
|
| 623 |
#define NEW_AUX_ENT(nr, id, val) \
|
| 624 |
put_user (id, sp + (nr * 2)); \
|
| 625 |
put_user (val, sp + (nr * 2 + 1)) |
| 626 |
sp -= 2;
|
| 627 |
NEW_AUX_ENT (0, AT_NULL, 0); |
| 628 |
|
| 629 |
sp -= DLINFO_ITEMS*2;
|
| 630 |
NEW_AUX_ENT( 0, AT_PHDR, (target_ulong)(load_addr + exec->e_phoff));
|
| 631 |
NEW_AUX_ENT( 1, AT_PHENT, (target_ulong)(sizeof (struct elf_phdr))); |
| 632 |
NEW_AUX_ENT( 2, AT_PHNUM, (target_ulong)(exec->e_phnum));
|
| 633 |
NEW_AUX_ENT( 3, AT_PAGESZ, (target_ulong)(TARGET_PAGE_SIZE));
|
| 634 |
NEW_AUX_ENT( 4, AT_BASE, (target_ulong)(interp_load_addr));
|
| 635 |
NEW_AUX_ENT( 5, AT_FLAGS, (target_ulong)0); |
| 636 |
NEW_AUX_ENT( 6, AT_ENTRY, load_bias + exec->e_entry);
|
| 637 |
NEW_AUX_ENT( 7, AT_UID, (target_ulong) getuid());
|
| 638 |
NEW_AUX_ENT( 8, AT_EUID, (target_ulong) geteuid());
|
| 639 |
NEW_AUX_ENT( 9, AT_GID, (target_ulong) getgid());
|
| 640 |
NEW_AUX_ENT(11, AT_EGID, (target_ulong) getegid());
|
| 641 |
#ifdef ARCH_DLINFO
|
| 642 |
/*
|
| 643 |
* ARCH_DLINFO must come last so platform specific code can enforce
|
| 644 |
* special alignment requirements on the AUXV if necessary (eg. PPC).
|
| 645 |
*/
|
| 646 |
ARCH_DLINFO; |
| 647 |
#endif
|
| 648 |
#undef NEW_AUX_ENT
|
| 649 |
|
| 650 |
sp -= envc+1;
|
| 651 |
envp = sp; |
| 652 |
sp -= argc+1;
|
| 653 |
argv = sp; |
| 654 |
if (!ibcs) {
|
| 655 |
put_user((target_ulong)envp,--sp); |
| 656 |
put_user((target_ulong)argv,--sp); |
| 657 |
} |
| 658 |
put_user(argc,--sp); |
| 659 |
info->arg_start = (unsigned int)((unsigned long)p & 0xffffffff); |
| 660 |
while (argc-->0) { |
| 661 |
put_user((target_ulong)p,argv++); |
| 662 |
do {
|
| 663 |
get_user(v, p); |
| 664 |
p++; |
| 665 |
} while (v != 0); |
| 666 |
} |
| 667 |
put_user(0,argv);
|
| 668 |
info->arg_end = info->env_start = (unsigned int)((unsigned long)p & 0xffffffff); |
| 669 |
while (envc-->0) { |
| 670 |
put_user((target_ulong)p,envp++); |
| 671 |
do {
|
| 672 |
get_user(v, p); |
| 673 |
p++; |
| 674 |
} while (v != 0); |
| 675 |
} |
| 676 |
put_user(0,envp);
|
| 677 |
info->env_end = (unsigned int)((unsigned long)p & 0xffffffff); |
| 678 |
return sp;
|
| 679 |
} |
| 680 |
|
| 681 |
|
| 682 |
|
| 683 |
static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex, |
| 684 |
int interpreter_fd,
|
| 685 |
unsigned long *interp_load_addr) |
| 686 |
{
|
| 687 |
struct elf_phdr *elf_phdata = NULL; |
| 688 |
struct elf_phdr *eppnt;
|
| 689 |
unsigned long load_addr = 0; |
| 690 |
int load_addr_set = 0; |
| 691 |
int retval;
|
| 692 |
unsigned long last_bss, elf_bss; |
| 693 |
unsigned long error; |
| 694 |
int i;
|
| 695 |
|
| 696 |
elf_bss = 0;
|
| 697 |
last_bss = 0;
|
| 698 |
error = 0;
|
| 699 |
|
| 700 |
#ifdef BSWAP_NEEDED
|
| 701 |
bswap_ehdr(interp_elf_ex); |
| 702 |
#endif
|
| 703 |
/* First of all, some simple consistency checks */
|
| 704 |
if ((interp_elf_ex->e_type != ET_EXEC &&
|
| 705 |
interp_elf_ex->e_type != ET_DYN) || |
| 706 |
!elf_check_arch(interp_elf_ex->e_machine)) {
|
| 707 |
return ~0UL; |
| 708 |
} |
| 709 |
|
| 710 |
|
| 711 |
/* Now read in all of the header information */
|
| 712 |
|
| 713 |
if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE) |
| 714 |
return ~0UL; |
| 715 |
|
| 716 |
elf_phdata = (struct elf_phdr *)
|
| 717 |
malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); |
| 718 |
|
| 719 |
if (!elf_phdata)
|
| 720 |
return ~0UL; |
| 721 |
|
| 722 |
/*
|
| 723 |
* If the size of this structure has changed, then punt, since
|
| 724 |
* we will be doing the wrong thing.
|
| 725 |
*/
|
| 726 |
if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) { |
| 727 |
free(elf_phdata); |
| 728 |
return ~0UL; |
| 729 |
} |
| 730 |
|
| 731 |
retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET); |
| 732 |
if(retval >= 0) { |
| 733 |
retval = read(interpreter_fd, |
| 734 |
(char *) elf_phdata,
|
| 735 |
sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); |
| 736 |
} |
| 737 |
if (retval < 0) { |
| 738 |
perror("load_elf_interp");
|
| 739 |
exit(-1);
|
| 740 |
free (elf_phdata); |
| 741 |
return retval;
|
| 742 |
} |
| 743 |
#ifdef BSWAP_NEEDED
|
| 744 |
eppnt = elf_phdata; |
| 745 |
for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) { |
| 746 |
bswap_phdr(eppnt); |
| 747 |
} |
| 748 |
#endif
|
| 749 |
|
| 750 |
if (interp_elf_ex->e_type == ET_DYN) {
|
| 751 |
/* in order to avoid harcoding the interpreter load
|
| 752 |
address in qemu, we allocate a big enough memory zone */
|
| 753 |
error = target_mmap(0, INTERP_MAP_SIZE,
|
| 754 |
PROT_NONE, MAP_PRIVATE | MAP_ANON, |
| 755 |
-1, 0); |
| 756 |
if (error == -1) { |
| 757 |
perror("mmap");
|
| 758 |
exit(-1);
|
| 759 |
} |
| 760 |
load_addr = error; |
| 761 |
load_addr_set = 1;
|
| 762 |
} |
| 763 |
|
| 764 |
eppnt = elf_phdata; |
| 765 |
for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) |
| 766 |
if (eppnt->p_type == PT_LOAD) {
|
| 767 |
int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
|
| 768 |
int elf_prot = 0; |
| 769 |
unsigned long vaddr = 0; |
| 770 |
unsigned long k; |
| 771 |
|
| 772 |
if (eppnt->p_flags & PF_R) elf_prot = PROT_READ;
|
| 773 |
if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
|
| 774 |
if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
|
| 775 |
if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) {
|
| 776 |
elf_type |= MAP_FIXED; |
| 777 |
vaddr = eppnt->p_vaddr; |
| 778 |
} |
| 779 |
error = target_mmap(load_addr+TARGET_ELF_PAGESTART(vaddr), |
| 780 |
eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr), |
| 781 |
elf_prot, |
| 782 |
elf_type, |
| 783 |
interpreter_fd, |
| 784 |
eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr)); |
| 785 |
|
| 786 |
if (error > -1024UL) { |
| 787 |
/* Real error */
|
| 788 |
close(interpreter_fd); |
| 789 |
free(elf_phdata); |
| 790 |
return ~0UL; |
| 791 |
} |
| 792 |
|
| 793 |
if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
|
| 794 |
load_addr = error; |
| 795 |
load_addr_set = 1;
|
| 796 |
} |
| 797 |
|
| 798 |
/*
|
| 799 |
* Find the end of the file mapping for this phdr, and keep
|
| 800 |
* track of the largest address we see for this.
|
| 801 |
*/
|
| 802 |
k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; |
| 803 |
if (k > elf_bss) elf_bss = k;
|
| 804 |
|
| 805 |
/*
|
| 806 |
* Do the same thing for the memory mapping - between
|
| 807 |
* elf_bss and last_bss is the bss section.
|
| 808 |
*/
|
| 809 |
k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; |
| 810 |
if (k > last_bss) last_bss = k;
|
| 811 |
} |
| 812 |
|
| 813 |
/* Now use mmap to map the library into memory. */
|
| 814 |
|
| 815 |
close(interpreter_fd); |
| 816 |
|
| 817 |
/*
|
| 818 |
* Now fill out the bss section. First pad the last page up
|
| 819 |
* to the page boundary, and then perform a mmap to make sure
|
| 820 |
* that there are zeromapped pages up to and including the last
|
| 821 |
* bss page.
|
| 822 |
*/
|
| 823 |
padzero(elf_bss); |
| 824 |
elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */ |
| 825 |
|
| 826 |
/* Map the last of the bss segment */
|
| 827 |
if (last_bss > elf_bss) {
|
| 828 |
target_mmap(elf_bss, last_bss-elf_bss, |
| 829 |
PROT_READ|PROT_WRITE|PROT_EXEC, |
| 830 |
MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
| 831 |
} |
| 832 |
free(elf_phdata); |
| 833 |
|
| 834 |
*interp_load_addr = load_addr; |
| 835 |
return ((unsigned long) interp_elf_ex->e_entry) + load_addr; |
| 836 |
} |
| 837 |
|
| 838 |
/* Best attempt to load symbols from this ELF object. */
|
| 839 |
static void load_symbols(struct elfhdr *hdr, int fd) |
| 840 |
{
|
| 841 |
unsigned int i; |
| 842 |
struct elf_shdr sechdr, symtab, strtab;
|
| 843 |
char *strings;
|
| 844 |
struct syminfo *s;
|
| 845 |
|
| 846 |
lseek(fd, hdr->e_shoff, SEEK_SET); |
| 847 |
for (i = 0; i < hdr->e_shnum; i++) { |
| 848 |
if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr)) |
| 849 |
return;
|
| 850 |
#ifdef BSWAP_NEEDED
|
| 851 |
bswap_shdr(&sechdr); |
| 852 |
#endif
|
| 853 |
if (sechdr.sh_type == SHT_SYMTAB) {
|
| 854 |
symtab = sechdr; |
| 855 |
lseek(fd, hdr->e_shoff |
| 856 |
+ sizeof(sechdr) * sechdr.sh_link, SEEK_SET);
|
| 857 |
if (read(fd, &strtab, sizeof(strtab)) |
| 858 |
!= sizeof(strtab))
|
| 859 |
return;
|
| 860 |
#ifdef BSWAP_NEEDED
|
| 861 |
bswap_shdr(&strtab); |
| 862 |
#endif
|
| 863 |
goto found;
|
| 864 |
} |
| 865 |
} |
| 866 |
return; /* Shouldn't happen... */ |
| 867 |
|
| 868 |
found:
|
| 869 |
/* Now know where the strtab and symtab are. Snarf them. */
|
| 870 |
s = malloc(sizeof(*s));
|
| 871 |
s->disas_symtab = malloc(symtab.sh_size); |
| 872 |
s->disas_strtab = strings = malloc(strtab.sh_size); |
| 873 |
if (!s->disas_symtab || !s->disas_strtab)
|
| 874 |
return;
|
| 875 |
|
| 876 |
lseek(fd, symtab.sh_offset, SEEK_SET); |
| 877 |
if (read(fd, s->disas_symtab, symtab.sh_size) != symtab.sh_size)
|
| 878 |
return;
|
| 879 |
|
| 880 |
#ifdef BSWAP_NEEDED
|
| 881 |
for (i = 0; i < symtab.sh_size / sizeof(struct elf_sym); i++) |
| 882 |
bswap_sym(s->disas_symtab + sizeof(struct elf_sym)*i); |
| 883 |
#endif
|
| 884 |
|
| 885 |
lseek(fd, strtab.sh_offset, SEEK_SET); |
| 886 |
if (read(fd, strings, strtab.sh_size) != strtab.sh_size)
|
| 887 |
return;
|
| 888 |
s->disas_num_syms = symtab.sh_size / sizeof(struct elf_sym); |
| 889 |
s->next = syminfos; |
| 890 |
syminfos = s; |
| 891 |
} |
| 892 |
|
| 893 |
static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs, |
| 894 |
struct image_info * info)
|
| 895 |
{
|
| 896 |
struct elfhdr elf_ex;
|
| 897 |
struct elfhdr interp_elf_ex;
|
| 898 |
struct exec interp_ex;
|
| 899 |
int interpreter_fd = -1; /* avoid warning */ |
| 900 |
unsigned long load_addr, load_bias; |
| 901 |
int load_addr_set = 0; |
| 902 |
unsigned int interpreter_type = INTERPRETER_NONE; |
| 903 |
unsigned char ibcs2_interpreter; |
| 904 |
int i;
|
| 905 |
unsigned long mapped_addr; |
| 906 |
struct elf_phdr * elf_ppnt;
|
| 907 |
struct elf_phdr *elf_phdata;
|
| 908 |
unsigned long elf_bss, k, elf_brk; |
| 909 |
int retval;
|
| 910 |
char * elf_interpreter;
|
| 911 |
unsigned long elf_entry, interp_load_addr = 0; |
| 912 |
int status;
|
| 913 |
unsigned long start_code, end_code, end_data; |
| 914 |
unsigned long elf_stack; |
| 915 |
char passed_fileno[6]; |
| 916 |
|
| 917 |
ibcs2_interpreter = 0;
|
| 918 |
status = 0;
|
| 919 |
load_addr = 0;
|
| 920 |
load_bias = 0;
|
| 921 |
elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */ |
| 922 |
#ifdef BSWAP_NEEDED
|
| 923 |
bswap_ehdr(&elf_ex); |
| 924 |
#endif
|
| 925 |
|
| 926 |
if (elf_ex.e_ident[0] != 0x7f || |
| 927 |
strncmp(&elf_ex.e_ident[1], "ELF",3) != 0) { |
| 928 |
return -ENOEXEC;
|
| 929 |
} |
| 930 |
|
| 931 |
/* First of all, some simple consistency checks */
|
| 932 |
if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
|
| 933 |
(! elf_check_arch(elf_ex.e_machine))) {
|
| 934 |
return -ENOEXEC;
|
| 935 |
} |
| 936 |
|
| 937 |
/* Now read in all of the header information */
|
| 938 |
elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum);
|
| 939 |
if (elf_phdata == NULL) { |
| 940 |
return -ENOMEM;
|
| 941 |
} |
| 942 |
|
| 943 |
retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET); |
| 944 |
if(retval > 0) { |
| 945 |
retval = read(bprm->fd, (char *) elf_phdata,
|
| 946 |
elf_ex.e_phentsize * elf_ex.e_phnum); |
| 947 |
} |
| 948 |
|
| 949 |
if (retval < 0) { |
| 950 |
perror("load_elf_binary");
|
| 951 |
exit(-1);
|
| 952 |
free (elf_phdata); |
| 953 |
return -errno;
|
| 954 |
} |
| 955 |
|
| 956 |
#ifdef BSWAP_NEEDED
|
| 957 |
elf_ppnt = elf_phdata; |
| 958 |
for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) { |
| 959 |
bswap_phdr(elf_ppnt); |
| 960 |
} |
| 961 |
#endif
|
| 962 |
elf_ppnt = elf_phdata; |
| 963 |
|
| 964 |
elf_bss = 0;
|
| 965 |
elf_brk = 0;
|
| 966 |
|
| 967 |
|
| 968 |
elf_stack = ~0UL;
|
| 969 |
elf_interpreter = NULL;
|
| 970 |
start_code = ~0UL;
|
| 971 |
end_code = 0;
|
| 972 |
end_data = 0;
|
| 973 |
|
| 974 |
for(i=0;i < elf_ex.e_phnum; i++) { |
| 975 |
if (elf_ppnt->p_type == PT_INTERP) {
|
| 976 |
if ( elf_interpreter != NULL ) |
| 977 |
{
|
| 978 |
free (elf_phdata); |
| 979 |
free(elf_interpreter); |
| 980 |
close(bprm->fd); |
| 981 |
return -EINVAL;
|
| 982 |
} |
| 983 |
|
| 984 |
/* This is the program interpreter used for
|
| 985 |
* shared libraries - for now assume that this
|
| 986 |
* is an a.out format binary
|
| 987 |
*/
|
| 988 |
|
| 989 |
elf_interpreter = (char *)malloc(elf_ppnt->p_filesz);
|
| 990 |
|
| 991 |
if (elf_interpreter == NULL) { |
| 992 |
free (elf_phdata); |
| 993 |
close(bprm->fd); |
| 994 |
return -ENOMEM;
|
| 995 |
} |
| 996 |
|
| 997 |
retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET); |
| 998 |
if(retval >= 0) { |
| 999 |
retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz); |
| 1000 |
} |
| 1001 |
if(retval < 0) { |
| 1002 |
perror("load_elf_binary2");
|
| 1003 |
exit(-1);
|
| 1004 |
} |
| 1005 |
|
| 1006 |
/* If the program interpreter is one of these two,
|
| 1007 |
then assume an iBCS2 image. Otherwise assume
|
| 1008 |
a native linux image. */
|
| 1009 |
|
| 1010 |
/* JRP - Need to add X86 lib dir stuff here... */
|
| 1011 |
|
| 1012 |
if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 || |
| 1013 |
strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) { |
| 1014 |
ibcs2_interpreter = 1;
|
| 1015 |
} |
| 1016 |
|
| 1017 |
#if 0
|
| 1018 |
printf("Using ELF interpreter %s\n", elf_interpreter);
|
| 1019 |
#endif
|
| 1020 |
if (retval >= 0) { |
| 1021 |
retval = open(path(elf_interpreter), O_RDONLY); |
| 1022 |
if(retval >= 0) { |
| 1023 |
interpreter_fd = retval; |
| 1024 |
} |
| 1025 |
else {
|
| 1026 |
perror(elf_interpreter); |
| 1027 |
exit(-1);
|
| 1028 |
/* retval = -errno; */
|
| 1029 |
} |
| 1030 |
} |
| 1031 |
|
| 1032 |
if (retval >= 0) { |
| 1033 |
retval = lseek(interpreter_fd, 0, SEEK_SET);
|
| 1034 |
if(retval >= 0) { |
| 1035 |
retval = read(interpreter_fd,bprm->buf,128);
|
| 1036 |
} |
| 1037 |
} |
| 1038 |
if (retval >= 0) { |
| 1039 |
interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */ |
| 1040 |
interp_elf_ex=*((struct elfhdr *) bprm->buf); /* elf exec-header */ |
| 1041 |
} |
| 1042 |
if (retval < 0) { |
| 1043 |
perror("load_elf_binary3");
|
| 1044 |
exit(-1);
|
| 1045 |
free (elf_phdata); |
| 1046 |
free(elf_interpreter); |
| 1047 |
close(bprm->fd); |
| 1048 |
return retval;
|
| 1049 |
} |
| 1050 |
} |
| 1051 |
elf_ppnt++; |
| 1052 |
} |
| 1053 |
|
| 1054 |
/* Some simple consistency checks for the interpreter */
|
| 1055 |
if (elf_interpreter){
|
| 1056 |
interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT; |
| 1057 |
|
| 1058 |
/* Now figure out which format our binary is */
|
| 1059 |
if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) &&
|
| 1060 |
(N_MAGIC(interp_ex) != QMAGIC)) {
|
| 1061 |
interpreter_type = INTERPRETER_ELF; |
| 1062 |
} |
| 1063 |
|
| 1064 |
if (interp_elf_ex.e_ident[0] != 0x7f || |
| 1065 |
strncmp(&interp_elf_ex.e_ident[1], "ELF",3) != 0) { |
| 1066 |
interpreter_type &= ~INTERPRETER_ELF; |
| 1067 |
} |
| 1068 |
|
| 1069 |
if (!interpreter_type) {
|
| 1070 |
free(elf_interpreter); |
| 1071 |
free(elf_phdata); |
| 1072 |
close(bprm->fd); |
| 1073 |
return -ELIBBAD;
|
| 1074 |
} |
| 1075 |
} |
| 1076 |
|
| 1077 |
/* OK, we are done with that, now set up the arg stuff,
|
| 1078 |
and then start this sucker up */
|
| 1079 |
|
| 1080 |
if (!bprm->sh_bang) {
|
| 1081 |
char * passed_p;
|
| 1082 |
|
| 1083 |
if (interpreter_type == INTERPRETER_AOUT) {
|
| 1084 |
snprintf(passed_fileno, sizeof(passed_fileno), "%d", bprm->fd); |
| 1085 |
passed_p = passed_fileno; |
| 1086 |
|
| 1087 |
if (elf_interpreter) {
|
| 1088 |
bprm->p = copy_strings(1,&passed_p,bprm->page,bprm->p);
|
| 1089 |
bprm->argc++; |
| 1090 |
} |
| 1091 |
} |
| 1092 |
if (!bprm->p) {
|
| 1093 |
if (elf_interpreter) {
|
| 1094 |
free(elf_interpreter); |
| 1095 |
} |
| 1096 |
free (elf_phdata); |
| 1097 |
close(bprm->fd); |
| 1098 |
return -E2BIG;
|
| 1099 |
} |
| 1100 |
} |
| 1101 |
|
| 1102 |
/* OK, This is the point of no return */
|
| 1103 |
info->end_data = 0;
|
| 1104 |
info->end_code = 0;
|
| 1105 |
info->start_mmap = (unsigned long)ELF_START_MMAP; |
| 1106 |
info->mmap = 0;
|
| 1107 |
elf_entry = (unsigned long) elf_ex.e_entry; |
| 1108 |
|
| 1109 |
/* Do this so that we can load the interpreter, if need be. We will
|
| 1110 |
change some of these later */
|
| 1111 |
info->rss = 0;
|
| 1112 |
bprm->p = setup_arg_pages(bprm->p, bprm, info); |
| 1113 |
info->start_stack = bprm->p; |
| 1114 |
|
| 1115 |
/* Now we do a little grungy work by mmaping the ELF image into
|
| 1116 |
* the correct location in memory. At this point, we assume that
|
| 1117 |
* the image should be loaded at fixed address, not at a variable
|
| 1118 |
* address.
|
| 1119 |
*/
|
| 1120 |
|
| 1121 |
for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) { |
| 1122 |
int elf_prot = 0; |
| 1123 |
int elf_flags = 0; |
| 1124 |
unsigned long error; |
| 1125 |
|
| 1126 |
if (elf_ppnt->p_type != PT_LOAD)
|
| 1127 |
continue;
|
| 1128 |
|
| 1129 |
if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
|
| 1130 |
if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
|
| 1131 |
if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
|
| 1132 |
elf_flags = MAP_PRIVATE | MAP_DENYWRITE; |
| 1133 |
if (elf_ex.e_type == ET_EXEC || load_addr_set) {
|
| 1134 |
elf_flags |= MAP_FIXED; |
| 1135 |
} else if (elf_ex.e_type == ET_DYN) { |
| 1136 |
/* Try and get dynamic programs out of the way of the default mmap
|
| 1137 |
base, as well as whatever program they might try to exec. This
|
| 1138 |
is because the brk will follow the loader, and is not movable. */
|
| 1139 |
/* NOTE: for qemu, we do a big mmap to get enough space
|
| 1140 |
without harcoding any address */
|
| 1141 |
error = target_mmap(0, ET_DYN_MAP_SIZE,
|
| 1142 |
PROT_NONE, MAP_PRIVATE | MAP_ANON, |
| 1143 |
-1, 0); |
| 1144 |
if (error == -1) { |
| 1145 |
perror("mmap");
|
| 1146 |
exit(-1);
|
| 1147 |
} |
| 1148 |
load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr); |
| 1149 |
} |
| 1150 |
|
| 1151 |
error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr), |
| 1152 |
(elf_ppnt->p_filesz + |
| 1153 |
TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), |
| 1154 |
elf_prot, |
| 1155 |
(MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), |
| 1156 |
bprm->fd, |
| 1157 |
(elf_ppnt->p_offset - |
| 1158 |
TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); |
| 1159 |
if (error == -1) { |
| 1160 |
perror("mmap");
|
| 1161 |
exit(-1);
|
| 1162 |
} |
| 1163 |
|
| 1164 |
#ifdef LOW_ELF_STACK
|
| 1165 |
if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack)
|
| 1166 |
elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr); |
| 1167 |
#endif
|
| 1168 |
|
| 1169 |
if (!load_addr_set) {
|
| 1170 |
load_addr_set = 1;
|
| 1171 |
load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset; |
| 1172 |
if (elf_ex.e_type == ET_DYN) {
|
| 1173 |
load_bias += error - |
| 1174 |
TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr); |
| 1175 |
load_addr += load_bias; |
| 1176 |
} |
| 1177 |
} |
| 1178 |
k = elf_ppnt->p_vaddr; |
| 1179 |
if (k < start_code)
|
| 1180 |
start_code = k; |
| 1181 |
k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; |
| 1182 |
if (k > elf_bss)
|
| 1183 |
elf_bss = k; |
| 1184 |
if ((elf_ppnt->p_flags & PF_X) && end_code < k)
|
| 1185 |
end_code = k; |
| 1186 |
if (end_data < k)
|
| 1187 |
end_data = k; |
| 1188 |
k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; |
| 1189 |
if (k > elf_brk) elf_brk = k;
|
| 1190 |
} |
| 1191 |
|
| 1192 |
elf_entry += load_bias; |
| 1193 |
elf_bss += load_bias; |
| 1194 |
elf_brk += load_bias; |
| 1195 |
start_code += load_bias; |
| 1196 |
end_code += load_bias; |
| 1197 |
// start_data += load_bias;
|
| 1198 |
end_data += load_bias; |
| 1199 |
|
| 1200 |
if (elf_interpreter) {
|
| 1201 |
if (interpreter_type & 1) { |
| 1202 |
elf_entry = load_aout_interp(&interp_ex, interpreter_fd); |
| 1203 |
} |
| 1204 |
else if (interpreter_type & 2) { |
| 1205 |
elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd, |
| 1206 |
&interp_load_addr); |
| 1207 |
} |
| 1208 |
|
| 1209 |
close(interpreter_fd); |
| 1210 |
free(elf_interpreter); |
| 1211 |
|
| 1212 |
if (elf_entry == ~0UL) { |
| 1213 |
printf("Unable to load interpreter\n");
|
| 1214 |
free(elf_phdata); |
| 1215 |
exit(-1);
|
| 1216 |
return 0; |
| 1217 |
} |
| 1218 |
} |
| 1219 |
|
| 1220 |
free(elf_phdata); |
| 1221 |
|
| 1222 |
if (loglevel)
|
| 1223 |
load_symbols(&elf_ex, bprm->fd); |
| 1224 |
|
| 1225 |
if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd);
|
| 1226 |
info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX); |
| 1227 |
|
| 1228 |
#ifdef LOW_ELF_STACK
|
| 1229 |
info->start_stack = bprm->p = elf_stack - 4;
|
| 1230 |
#endif
|
| 1231 |
bprm->p = (unsigned long) |
| 1232 |
create_elf_tables((char *)bprm->p,
|
| 1233 |
bprm->argc, |
| 1234 |
bprm->envc, |
| 1235 |
&elf_ex, |
| 1236 |
load_addr, load_bias, |
| 1237 |
interp_load_addr, |
| 1238 |
(interpreter_type == INTERPRETER_AOUT ? 0 : 1), |
| 1239 |
info); |
| 1240 |
if (interpreter_type == INTERPRETER_AOUT)
|
| 1241 |
info->arg_start += strlen(passed_fileno) + 1;
|
| 1242 |
info->start_brk = info->brk = elf_brk; |
| 1243 |
info->end_code = end_code; |
| 1244 |
info->start_code = start_code; |
| 1245 |
info->end_data = end_data; |
| 1246 |
info->start_stack = bprm->p; |
| 1247 |
|
| 1248 |
/* Calling set_brk effectively mmaps the pages that we need for the bss and break
|
| 1249 |
sections */
|
| 1250 |
set_brk(elf_bss, elf_brk); |
| 1251 |
|
| 1252 |
padzero(elf_bss); |
| 1253 |
|
| 1254 |
#if 0
|
| 1255 |
printf("(start_brk) %x\n" , info->start_brk);
|
| 1256 |
printf("(end_code) %x\n" , info->end_code);
|
| 1257 |
printf("(start_code) %x\n" , info->start_code);
|
| 1258 |
printf("(end_data) %x\n" , info->end_data);
|
| 1259 |
printf("(start_stack) %x\n" , info->start_stack);
|
| 1260 |
printf("(brk) %x\n" , info->brk);
|
| 1261 |
#endif
|
| 1262 |
|
| 1263 |
if ( info->personality == PER_SVR4 )
|
| 1264 |
{
|
| 1265 |
/* Why this, you ask??? Well SVr4 maps page 0 as read-only,
|
| 1266 |
and some applications "depend" upon this behavior.
|
| 1267 |
Since we do not have the power to recompile these, we
|
| 1268 |
emulate the SVr4 behavior. Sigh. */
|
| 1269 |
mapped_addr = target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
|
| 1270 |
MAP_FIXED | MAP_PRIVATE, -1, 0); |
| 1271 |
} |
| 1272 |
|
| 1273 |
#ifdef ELF_PLAT_INIT
|
| 1274 |
/*
|
| 1275 |
* The ABI may specify that certain registers be set up in special
|
| 1276 |
* ways (on i386 %edx is the address of a DT_FINI function, for
|
| 1277 |
* example. This macro performs whatever initialization to
|
| 1278 |
* the regs structure is required.
|
| 1279 |
*/
|
| 1280 |
ELF_PLAT_INIT(regs); |
| 1281 |
#endif
|
| 1282 |
|
| 1283 |
|
| 1284 |
info->entry = elf_entry; |
| 1285 |
|
| 1286 |
return 0; |
| 1287 |
} |
| 1288 |
|
| 1289 |
|
| 1290 |
|
| 1291 |
int elf_exec(const char * filename, char ** argv, char ** envp, |
| 1292 |
struct target_pt_regs * regs, struct image_info *infop) |
| 1293 |
{
|
| 1294 |
struct linux_binprm bprm;
|
| 1295 |
int retval;
|
| 1296 |
int i;
|
| 1297 |
|
| 1298 |
bprm.p = TARGET_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int); |
| 1299 |
for (i=0 ; i<MAX_ARG_PAGES ; i++) /* clear page-table */ |
| 1300 |
bprm.page[i] = 0;
|
| 1301 |
retval = open(filename, O_RDONLY); |
| 1302 |
if (retval < 0) |
| 1303 |
return retval;
|
| 1304 |
bprm.fd = retval; |
| 1305 |
bprm.filename = (char *)filename;
|
| 1306 |
bprm.sh_bang = 0;
|
| 1307 |
bprm.loader = 0;
|
| 1308 |
bprm.exec = 0;
|
| 1309 |
bprm.dont_iput = 0;
|
| 1310 |
bprm.argc = count(argv); |
| 1311 |
bprm.envc = count(envp); |
| 1312 |
|
| 1313 |
retval = prepare_binprm(&bprm); |
| 1314 |
|
| 1315 |
if(retval>=0) { |
| 1316 |
bprm.p = copy_strings(1, &bprm.filename, bprm.page, bprm.p);
|
| 1317 |
bprm.exec = bprm.p; |
| 1318 |
bprm.p = copy_strings(bprm.envc,envp,bprm.page,bprm.p); |
| 1319 |
bprm.p = copy_strings(bprm.argc,argv,bprm.page,bprm.p); |
| 1320 |
if (!bprm.p) {
|
| 1321 |
retval = -E2BIG; |
| 1322 |
} |
| 1323 |
} |
| 1324 |
|
| 1325 |
if(retval>=0) { |
| 1326 |
retval = load_elf_binary(&bprm,regs,infop); |
| 1327 |
} |
| 1328 |
if(retval>=0) { |
| 1329 |
/* success. Initialize important registers */
|
| 1330 |
init_thread(regs, infop); |
| 1331 |
return retval;
|
| 1332 |
} |
| 1333 |
|
| 1334 |
/* Something went wrong, return the inode and free the argument pages*/
|
| 1335 |
for (i=0 ; i<MAX_ARG_PAGES ; i++) { |
| 1336 |
free_page((void *)bprm.page[i]);
|
| 1337 |
} |
| 1338 |
return(retval);
|
| 1339 |
} |
| 1340 |
|
| 1341 |
|
| 1342 |
static int load_aout_interp(void * exptr, int interp_fd) |
| 1343 |
{
|
| 1344 |
printf("a.out interpreter not yet supported\n");
|
| 1345 |
return(0); |
| 1346 |
} |
| 1347 |
|