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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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#ifdef TARGET_SPARC64
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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 ELFCLASS64
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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->tstate = 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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#else
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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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#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(struct elfhdr *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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bswaptls(&ehdr->e_entry); /* Entry point virtual address */
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bswaptls(&ehdr->e_phoff); /* Program header table file offset */
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bswaptls(&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(struct elf_phdr *phdr) |
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{ |
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bswap32s(&phdr->p_type); /* Segment type */
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bswaptls(&phdr->p_offset); /* Segment file offset */
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bswaptls(&phdr->p_vaddr); /* Segment virtual address */
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bswaptls(&phdr->p_paddr); /* Segment physical address */
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bswaptls(&phdr->p_filesz); /* Segment size in file */
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bswaptls(&phdr->p_memsz); /* Segment size in memory */
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bswap32s(&phdr->p_flags); /* Segment flags */
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bswaptls(&phdr->p_align); /* Segment alignment */
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} |
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static void bswap_shdr(struct elf_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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bswaptls(&shdr->sh_flags); |
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bswaptls(&shdr->sh_addr); |
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bswaptls(&shdr->sh_offset); |
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bswaptls(&shdr->sh_size); |
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bswap32s(&shdr->sh_link); |
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bswap32s(&shdr->sh_info); |
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bswaptls(&shdr->sh_addralign); |
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bswaptls(&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); |
370 |
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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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static void free_page(void * pageaddr) |
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{ |
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target_munmap((unsigned long)pageaddr, qemu_host_page_size); |
383 |
} |
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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; |
396 |
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if (!p) {
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return 0; /* bullet-proofing */ |
399 |
} |
400 |
while (argc-- > 0) { |
401 |
tmp = argv[argc]; |
402 |
if (!tmp) {
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fprintf(stderr, "VFS: argc is wrong");
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exit(-1);
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} |
406 |
tmp1 = tmp; |
407 |
while (*tmp++);
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len = tmp - tmp1; |
409 |
if (p < len) { /* this shouldn't happen - 128kB */ |
410 |
return 0; |
411 |
} |
412 |
while (len) {
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--p; --tmp; --len; |
414 |
if (--offset < 0) { |
415 |
offset = p % TARGET_PAGE_SIZE; |
416 |
pag = (char *) page[p/TARGET_PAGE_SIZE];
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417 |
if (!pag) {
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pag = (char *)get_free_page();
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page[p/TARGET_PAGE_SIZE] = (unsigned long)pag; |
420 |
if (!pag)
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return 0; |
422 |
} |
423 |
} |
424 |
if (len == 0 || offset == 0) { |
425 |
*(pag + offset) = *tmp; |
426 |
} |
427 |
else {
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int bytes_to_copy = (len > offset) ? offset : len;
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tmp -= bytes_to_copy; |
430 |
p -= bytes_to_copy; |
431 |
offset -= bytes_to_copy; |
432 |
len -= bytes_to_copy; |
433 |
memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1);
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} |
435 |
} |
436 |
} |
437 |
return p;
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} |
439 |
|
440 |
static int in_group_p(gid_t g) |
441 |
{ |
442 |
/* return TRUE if we're in the specified group, FALSE otherwise */
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int ngroup;
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int i;
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gid_t grouplist[NGROUPS]; |
446 |
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ngroup = getgroups(NGROUPS, grouplist); |
448 |
for(i = 0; i < ngroup; i++) { |
449 |
if(grouplist[i] == g) {
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return 1; |
451 |
} |
452 |
} |
453 |
return 0; |
454 |
} |
455 |
|
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static int count(char ** vec) |
457 |
{ |
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int i;
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|
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for(i = 0; *vec; i++) { |
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vec++; |
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} |
463 |
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return(i);
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} |
466 |
|
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static int prepare_binprm(struct linux_binprm *bprm) |
468 |
{ |
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struct stat st;
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int mode;
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int retval, id_change;
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|
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if(fstat(bprm->fd, &st) < 0) { |
474 |
return(-errno);
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} |
476 |
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mode = st.st_mode; |
478 |
if(!S_ISREG(mode)) { /* Must be regular file */ |
479 |
return(-EACCES);
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} |
481 |
if(!(mode & 0111)) { /* Must have at least one execute bit set */ |
482 |
return(-EACCES);
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} |
484 |
|
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bprm->e_uid = geteuid(); |
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bprm->e_gid = getegid(); |
487 |
id_change = 0;
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|
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/* Set-uid? */
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if(mode & S_ISUID) {
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bprm->e_uid = st.st_uid; |
492 |
if(bprm->e_uid != geteuid()) {
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id_change = 1;
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} |
495 |
} |
496 |
|
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/* Set-gid? */
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498 |
/*
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* If setgid is set but no group execute bit then this
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* is a candidate for mandatory locking, not a setgid
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* executable.
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*/
|
503 |
if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
|
504 |
bprm->e_gid = st.st_gid; |
505 |
if (!in_group_p(bprm->e_gid)) {
|
506 |
id_change = 1;
|
507 |
} |
508 |
} |
509 |
|
510 |
memset(bprm->buf, 0, sizeof(bprm->buf)); |
511 |
retval = lseek(bprm->fd, 0L, SEEK_SET);
|
512 |
if(retval >= 0) { |
513 |
retval = read(bprm->fd, bprm->buf, 128);
|
514 |
} |
515 |
if(retval < 0) { |
516 |
perror("prepare_binprm");
|
517 |
exit(-1);
|
518 |
/* return(-errno); */
|
519 |
} |
520 |
else {
|
521 |
return(retval);
|
522 |
} |
523 |
} |
524 |
|
525 |
unsigned long setup_arg_pages(unsigned long p, struct linux_binprm * bprm, |
526 |
struct image_info * info)
|
527 |
{ |
528 |
unsigned long stack_base, size, error; |
529 |
int i;
|
530 |
|
531 |
/* Create enough stack to hold everything. If we don't use
|
532 |
* it for args, we'll use it for something else...
|
533 |
*/
|
534 |
size = x86_stack_size; |
535 |
if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE)
|
536 |
size = MAX_ARG_PAGES*TARGET_PAGE_SIZE; |
537 |
error = target_mmap(0,
|
538 |
size + qemu_host_page_size, |
539 |
PROT_READ | PROT_WRITE, |
540 |
MAP_PRIVATE | MAP_ANONYMOUS, |
541 |
-1, 0); |
542 |
if (error == -1) { |
543 |
perror("stk mmap");
|
544 |
exit(-1);
|
545 |
} |
546 |
/* we reserve one extra page at the top of the stack as guard */
|
547 |
target_mprotect(error + size, qemu_host_page_size, PROT_NONE); |
548 |
|
549 |
stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE; |
550 |
p += stack_base; |
551 |
|
552 |
if (bprm->loader) {
|
553 |
bprm->loader += stack_base; |
554 |
} |
555 |
bprm->exec += stack_base; |
556 |
|
557 |
for (i = 0 ; i < MAX_ARG_PAGES ; i++) { |
558 |
if (bprm->page[i]) {
|
559 |
info->rss++; |
560 |
|
561 |
memcpy((void *)stack_base, (void *)bprm->page[i], TARGET_PAGE_SIZE); |
562 |
free_page((void *)bprm->page[i]);
|
563 |
} |
564 |
stack_base += TARGET_PAGE_SIZE; |
565 |
} |
566 |
return p;
|
567 |
} |
568 |
|
569 |
static void set_brk(unsigned long start, unsigned long end) |
570 |
{ |
571 |
/* page-align the start and end addresses... */
|
572 |
start = HOST_PAGE_ALIGN(start); |
573 |
end = HOST_PAGE_ALIGN(end); |
574 |
if (end <= start)
|
575 |
return;
|
576 |
if(target_mmap(start, end - start,
|
577 |
PROT_READ | PROT_WRITE | PROT_EXEC, |
578 |
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) { |
579 |
perror("cannot mmap brk");
|
580 |
exit(-1);
|
581 |
} |
582 |
} |
583 |
|
584 |
|
585 |
/* We need to explicitly zero any fractional pages after the data
|
586 |
section (i.e. bss). This would contain the junk from the file that
|
587 |
should not be in memory. */
|
588 |
static void padzero(unsigned long elf_bss) |
589 |
{ |
590 |
unsigned long nbyte; |
591 |
char * fpnt;
|
592 |
|
593 |
/* XXX: this is really a hack : if the real host page size is
|
594 |
smaller than the target page size, some pages after the end
|
595 |
of the file may not be mapped. A better fix would be to
|
596 |
patch target_mmap(), but it is more complicated as the file
|
597 |
size must be known */
|
598 |
if (qemu_real_host_page_size < qemu_host_page_size) {
|
599 |
unsigned long end_addr, end_addr1; |
600 |
end_addr1 = (elf_bss + qemu_real_host_page_size - 1) &
|
601 |
~(qemu_real_host_page_size - 1);
|
602 |
end_addr = HOST_PAGE_ALIGN(elf_bss); |
603 |
if (end_addr1 < end_addr) {
|
604 |
mmap((void *)end_addr1, end_addr - end_addr1,
|
605 |
PROT_READ|PROT_WRITE|PROT_EXEC, |
606 |
MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
607 |
} |
608 |
} |
609 |
|
610 |
nbyte = elf_bss & (qemu_host_page_size-1);
|
611 |
if (nbyte) {
|
612 |
nbyte = qemu_host_page_size - nbyte; |
613 |
fpnt = (char *) elf_bss;
|
614 |
do {
|
615 |
*fpnt++ = 0;
|
616 |
} while (--nbyte);
|
617 |
} |
618 |
} |
619 |
|
620 |
static unsigned int * create_elf_tables(char *p, int argc, int envc, |
621 |
struct elfhdr * exec,
|
622 |
unsigned long load_addr, |
623 |
unsigned long load_bias, |
624 |
unsigned long interp_load_addr, int ibcs, |
625 |
struct image_info *info)
|
626 |
{ |
627 |
target_ulong *argv, *envp; |
628 |
target_ulong *sp, *csp; |
629 |
int v;
|
630 |
|
631 |
/*
|
632 |
* Force 16 byte _final_ alignment here for generality.
|
633 |
*/
|
634 |
sp = (unsigned int *) (~15UL & (unsigned long) p); |
635 |
csp = sp; |
636 |
csp -= (DLINFO_ITEMS + 1) * 2; |
637 |
#ifdef DLINFO_ARCH_ITEMS
|
638 |
csp -= DLINFO_ARCH_ITEMS*2;
|
639 |
#endif
|
640 |
csp -= envc+1;
|
641 |
csp -= argc+1;
|
642 |
csp -= (!ibcs ? 3 : 1); /* argc itself */ |
643 |
if ((unsigned long)csp & 15UL) |
644 |
sp -= ((unsigned long)csp & 15UL) / sizeof(*sp); |
645 |
|
646 |
#define NEW_AUX_ENT(nr, id, val) \
|
647 |
put_user (id, sp + (nr * 2)); \
|
648 |
put_user (val, sp + (nr * 2 + 1)) |
649 |
sp -= 2;
|
650 |
NEW_AUX_ENT (0, AT_NULL, 0); |
651 |
|
652 |
sp -= DLINFO_ITEMS*2;
|
653 |
NEW_AUX_ENT( 0, AT_PHDR, (target_ulong)(load_addr + exec->e_phoff));
|
654 |
NEW_AUX_ENT( 1, AT_PHENT, (target_ulong)(sizeof (struct elf_phdr))); |
655 |
NEW_AUX_ENT( 2, AT_PHNUM, (target_ulong)(exec->e_phnum));
|
656 |
NEW_AUX_ENT( 3, AT_PAGESZ, (target_ulong)(TARGET_PAGE_SIZE));
|
657 |
NEW_AUX_ENT( 4, AT_BASE, (target_ulong)(interp_load_addr));
|
658 |
NEW_AUX_ENT( 5, AT_FLAGS, (target_ulong)0); |
659 |
NEW_AUX_ENT( 6, AT_ENTRY, load_bias + exec->e_entry);
|
660 |
NEW_AUX_ENT( 7, AT_UID, (target_ulong) getuid());
|
661 |
NEW_AUX_ENT( 8, AT_EUID, (target_ulong) geteuid());
|
662 |
NEW_AUX_ENT( 9, AT_GID, (target_ulong) getgid());
|
663 |
NEW_AUX_ENT(11, AT_EGID, (target_ulong) getegid());
|
664 |
#ifdef ARCH_DLINFO
|
665 |
/*
|
666 |
* ARCH_DLINFO must come last so platform specific code can enforce
|
667 |
* special alignment requirements on the AUXV if necessary (eg. PPC).
|
668 |
*/
|
669 |
ARCH_DLINFO; |
670 |
#endif
|
671 |
#undef NEW_AUX_ENT
|
672 |
|
673 |
sp -= envc+1;
|
674 |
envp = sp; |
675 |
sp -= argc+1;
|
676 |
argv = sp; |
677 |
if (!ibcs) {
|
678 |
put_user((target_ulong)envp,--sp); |
679 |
put_user((target_ulong)argv,--sp); |
680 |
} |
681 |
put_user(argc,--sp); |
682 |
info->arg_start = (unsigned int)((unsigned long)p & 0xffffffff); |
683 |
while (argc-->0) { |
684 |
put_user((target_ulong)p,argv++); |
685 |
do {
|
686 |
get_user(v, p); |
687 |
p++; |
688 |
} while (v != 0); |
689 |
} |
690 |
put_user(0,argv);
|
691 |
info->arg_end = info->env_start = (unsigned int)((unsigned long)p & 0xffffffff); |
692 |
while (envc-->0) { |
693 |
put_user((target_ulong)p,envp++); |
694 |
do {
|
695 |
get_user(v, p); |
696 |
p++; |
697 |
} while (v != 0); |
698 |
} |
699 |
put_user(0,envp);
|
700 |
info->env_end = (unsigned int)((unsigned long)p & 0xffffffff); |
701 |
return sp;
|
702 |
} |
703 |
|
704 |
|
705 |
|
706 |
static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex, |
707 |
int interpreter_fd,
|
708 |
unsigned long *interp_load_addr) |
709 |
{ |
710 |
struct elf_phdr *elf_phdata = NULL; |
711 |
struct elf_phdr *eppnt;
|
712 |
unsigned long load_addr = 0; |
713 |
int load_addr_set = 0; |
714 |
int retval;
|
715 |
unsigned long last_bss, elf_bss; |
716 |
unsigned long error; |
717 |
int i;
|
718 |
|
719 |
elf_bss = 0;
|
720 |
last_bss = 0;
|
721 |
error = 0;
|
722 |
|
723 |
#ifdef BSWAP_NEEDED
|
724 |
bswap_ehdr(interp_elf_ex); |
725 |
#endif
|
726 |
/* First of all, some simple consistency checks */
|
727 |
if ((interp_elf_ex->e_type != ET_EXEC &&
|
728 |
interp_elf_ex->e_type != ET_DYN) || |
729 |
!elf_check_arch(interp_elf_ex->e_machine)) { |
730 |
return ~0UL; |
731 |
} |
732 |
|
733 |
|
734 |
/* Now read in all of the header information */
|
735 |
|
736 |
if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE) |
737 |
return ~0UL; |
738 |
|
739 |
elf_phdata = (struct elf_phdr *)
|
740 |
malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); |
741 |
|
742 |
if (!elf_phdata)
|
743 |
return ~0UL; |
744 |
|
745 |
/*
|
746 |
* If the size of this structure has changed, then punt, since
|
747 |
* we will be doing the wrong thing.
|
748 |
*/
|
749 |
if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) { |
750 |
free(elf_phdata); |
751 |
return ~0UL; |
752 |
} |
753 |
|
754 |
retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET); |
755 |
if(retval >= 0) { |
756 |
retval = read(interpreter_fd, |
757 |
(char *) elf_phdata,
|
758 |
sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); |
759 |
} |
760 |
if (retval < 0) { |
761 |
perror("load_elf_interp");
|
762 |
exit(-1);
|
763 |
free (elf_phdata); |
764 |
return retval;
|
765 |
} |
766 |
#ifdef BSWAP_NEEDED
|
767 |
eppnt = elf_phdata; |
768 |
for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) { |
769 |
bswap_phdr(eppnt); |
770 |
} |
771 |
#endif
|
772 |
|
773 |
if (interp_elf_ex->e_type == ET_DYN) {
|
774 |
/* in order to avoid harcoding the interpreter load
|
775 |
address in qemu, we allocate a big enough memory zone */
|
776 |
error = target_mmap(0, INTERP_MAP_SIZE,
|
777 |
PROT_NONE, MAP_PRIVATE | MAP_ANON, |
778 |
-1, 0); |
779 |
if (error == -1) { |
780 |
perror("mmap");
|
781 |
exit(-1);
|
782 |
} |
783 |
load_addr = error; |
784 |
load_addr_set = 1;
|
785 |
} |
786 |
|
787 |
eppnt = elf_phdata; |
788 |
for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) |
789 |
if (eppnt->p_type == PT_LOAD) {
|
790 |
int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
|
791 |
int elf_prot = 0; |
792 |
unsigned long vaddr = 0; |
793 |
unsigned long k; |
794 |
|
795 |
if (eppnt->p_flags & PF_R) elf_prot = PROT_READ;
|
796 |
if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
|
797 |
if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
|
798 |
if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) {
|
799 |
elf_type |= MAP_FIXED; |
800 |
vaddr = eppnt->p_vaddr; |
801 |
} |
802 |
error = target_mmap(load_addr+TARGET_ELF_PAGESTART(vaddr), |
803 |
eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr), |
804 |
elf_prot, |
805 |
elf_type, |
806 |
interpreter_fd, |
807 |
eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr)); |
808 |
|
809 |
if (error > -1024UL) { |
810 |
/* Real error */
|
811 |
close(interpreter_fd); |
812 |
free(elf_phdata); |
813 |
return ~0UL; |
814 |
} |
815 |
|
816 |
if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
|
817 |
load_addr = error; |
818 |
load_addr_set = 1;
|
819 |
} |
820 |
|
821 |
/*
|
822 |
* Find the end of the file mapping for this phdr, and keep
|
823 |
* track of the largest address we see for this.
|
824 |
*/
|
825 |
k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; |
826 |
if (k > elf_bss) elf_bss = k;
|
827 |
|
828 |
/*
|
829 |
* Do the same thing for the memory mapping - between
|
830 |
* elf_bss and last_bss is the bss section.
|
831 |
*/
|
832 |
k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; |
833 |
if (k > last_bss) last_bss = k;
|
834 |
} |
835 |
|
836 |
/* Now use mmap to map the library into memory. */
|
837 |
|
838 |
close(interpreter_fd); |
839 |
|
840 |
/*
|
841 |
* Now fill out the bss section. First pad the last page up
|
842 |
* to the page boundary, and then perform a mmap to make sure
|
843 |
* that there are zeromapped pages up to and including the last
|
844 |
* bss page.
|
845 |
*/
|
846 |
padzero(elf_bss); |
847 |
elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */ |
848 |
|
849 |
/* Map the last of the bss segment */
|
850 |
if (last_bss > elf_bss) {
|
851 |
target_mmap(elf_bss, last_bss-elf_bss, |
852 |
PROT_READ|PROT_WRITE|PROT_EXEC, |
853 |
MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
854 |
} |
855 |
free(elf_phdata); |
856 |
|
857 |
*interp_load_addr = load_addr; |
858 |
return ((unsigned long) interp_elf_ex->e_entry) + load_addr; |
859 |
} |
860 |
|
861 |
/* Best attempt to load symbols from this ELF object. */
|
862 |
static void load_symbols(struct elfhdr *hdr, int fd) |
863 |
{ |
864 |
unsigned int i; |
865 |
struct elf_shdr sechdr, symtab, strtab;
|
866 |
char *strings;
|
867 |
struct syminfo *s;
|
868 |
|
869 |
lseek(fd, hdr->e_shoff, SEEK_SET); |
870 |
for (i = 0; i < hdr->e_shnum; i++) { |
871 |
if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr)) |
872 |
return;
|
873 |
#ifdef BSWAP_NEEDED
|
874 |
bswap_shdr(&sechdr); |
875 |
#endif
|
876 |
if (sechdr.sh_type == SHT_SYMTAB) {
|
877 |
symtab = sechdr; |
878 |
lseek(fd, hdr->e_shoff |
879 |
+ sizeof(sechdr) * sechdr.sh_link, SEEK_SET);
|
880 |
if (read(fd, &strtab, sizeof(strtab)) |
881 |
!= sizeof(strtab))
|
882 |
return;
|
883 |
#ifdef BSWAP_NEEDED
|
884 |
bswap_shdr(&strtab); |
885 |
#endif
|
886 |
goto found;
|
887 |
} |
888 |
} |
889 |
return; /* Shouldn't happen... */ |
890 |
|
891 |
found:
|
892 |
/* Now know where the strtab and symtab are. Snarf them. */
|
893 |
s = malloc(sizeof(*s));
|
894 |
s->disas_symtab = malloc(symtab.sh_size); |
895 |
s->disas_strtab = strings = malloc(strtab.sh_size); |
896 |
if (!s->disas_symtab || !s->disas_strtab)
|
897 |
return;
|
898 |
|
899 |
lseek(fd, symtab.sh_offset, SEEK_SET); |
900 |
if (read(fd, s->disas_symtab, symtab.sh_size) != symtab.sh_size)
|
901 |
return;
|
902 |
|
903 |
#ifdef BSWAP_NEEDED
|
904 |
for (i = 0; i < symtab.sh_size / sizeof(struct elf_sym); i++) |
905 |
bswap_sym(s->disas_symtab + sizeof(struct elf_sym)*i); |
906 |
#endif
|
907 |
|
908 |
lseek(fd, strtab.sh_offset, SEEK_SET); |
909 |
if (read(fd, strings, strtab.sh_size) != strtab.sh_size)
|
910 |
return;
|
911 |
s->disas_num_syms = symtab.sh_size / sizeof(struct elf_sym); |
912 |
s->next = syminfos; |
913 |
syminfos = s; |
914 |
} |
915 |
|
916 |
static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs, |
917 |
struct image_info * info)
|
918 |
{ |
919 |
struct elfhdr elf_ex;
|
920 |
struct elfhdr interp_elf_ex;
|
921 |
struct exec interp_ex;
|
922 |
int interpreter_fd = -1; /* avoid warning */ |
923 |
unsigned long load_addr, load_bias; |
924 |
int load_addr_set = 0; |
925 |
unsigned int interpreter_type = INTERPRETER_NONE; |
926 |
unsigned char ibcs2_interpreter; |
927 |
int i;
|
928 |
unsigned long mapped_addr; |
929 |
struct elf_phdr * elf_ppnt;
|
930 |
struct elf_phdr *elf_phdata;
|
931 |
unsigned long elf_bss, k, elf_brk; |
932 |
int retval;
|
933 |
char * elf_interpreter;
|
934 |
unsigned long elf_entry, interp_load_addr = 0; |
935 |
int status;
|
936 |
unsigned long start_code, end_code, end_data; |
937 |
unsigned long elf_stack; |
938 |
char passed_fileno[6]; |
939 |
|
940 |
ibcs2_interpreter = 0;
|
941 |
status = 0;
|
942 |
load_addr = 0;
|
943 |
load_bias = 0;
|
944 |
elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */ |
945 |
#ifdef BSWAP_NEEDED
|
946 |
bswap_ehdr(&elf_ex); |
947 |
#endif
|
948 |
|
949 |
if (elf_ex.e_ident[0] != 0x7f || |
950 |
strncmp(&elf_ex.e_ident[1], "ELF",3) != 0) { |
951 |
return -ENOEXEC;
|
952 |
} |
953 |
|
954 |
/* First of all, some simple consistency checks */
|
955 |
if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
|
956 |
(! elf_check_arch(elf_ex.e_machine))) { |
957 |
return -ENOEXEC;
|
958 |
} |
959 |
|
960 |
/* Now read in all of the header information */
|
961 |
elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum);
|
962 |
if (elf_phdata == NULL) { |
963 |
return -ENOMEM;
|
964 |
} |
965 |
|
966 |
retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET); |
967 |
if(retval > 0) { |
968 |
retval = read(bprm->fd, (char *) elf_phdata,
|
969 |
elf_ex.e_phentsize * elf_ex.e_phnum); |
970 |
} |
971 |
|
972 |
if (retval < 0) { |
973 |
perror("load_elf_binary");
|
974 |
exit(-1);
|
975 |
free (elf_phdata); |
976 |
return -errno;
|
977 |
} |
978 |
|
979 |
#ifdef BSWAP_NEEDED
|
980 |
elf_ppnt = elf_phdata; |
981 |
for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) { |
982 |
bswap_phdr(elf_ppnt); |
983 |
} |
984 |
#endif
|
985 |
elf_ppnt = elf_phdata; |
986 |
|
987 |
elf_bss = 0;
|
988 |
elf_brk = 0;
|
989 |
|
990 |
|
991 |
elf_stack = ~0UL;
|
992 |
elf_interpreter = NULL;
|
993 |
start_code = ~0UL;
|
994 |
end_code = 0;
|
995 |
end_data = 0;
|
996 |
|
997 |
for(i=0;i < elf_ex.e_phnum; i++) { |
998 |
if (elf_ppnt->p_type == PT_INTERP) {
|
999 |
if ( elf_interpreter != NULL ) |
1000 |
{ |
1001 |
free (elf_phdata); |
1002 |
free(elf_interpreter); |
1003 |
close(bprm->fd); |
1004 |
return -EINVAL;
|
1005 |
} |
1006 |
|
1007 |
/* This is the program interpreter used for
|
1008 |
* shared libraries - for now assume that this
|
1009 |
* is an a.out format binary
|
1010 |
*/
|
1011 |
|
1012 |
elf_interpreter = (char *)malloc(elf_ppnt->p_filesz);
|
1013 |
|
1014 |
if (elf_interpreter == NULL) { |
1015 |
free (elf_phdata); |
1016 |
close(bprm->fd); |
1017 |
return -ENOMEM;
|
1018 |
} |
1019 |
|
1020 |
retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET); |
1021 |
if(retval >= 0) { |
1022 |
retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz); |
1023 |
} |
1024 |
if(retval < 0) { |
1025 |
perror("load_elf_binary2");
|
1026 |
exit(-1);
|
1027 |
} |
1028 |
|
1029 |
/* If the program interpreter is one of these two,
|
1030 |
then assume an iBCS2 image. Otherwise assume
|
1031 |
a native linux image. */
|
1032 |
|
1033 |
/* JRP - Need to add X86 lib dir stuff here... */
|
1034 |
|
1035 |
if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 || |
1036 |
strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) { |
1037 |
ibcs2_interpreter = 1;
|
1038 |
} |
1039 |
|
1040 |
#if 0
|
1041 |
printf("Using ELF interpreter %s\n", elf_interpreter);
|
1042 |
#endif
|
1043 |
if (retval >= 0) { |
1044 |
retval = open(path(elf_interpreter), O_RDONLY); |
1045 |
if(retval >= 0) { |
1046 |
interpreter_fd = retval; |
1047 |
} |
1048 |
else {
|
1049 |
perror(elf_interpreter); |
1050 |
exit(-1);
|
1051 |
/* retval = -errno; */
|
1052 |
} |
1053 |
} |
1054 |
|
1055 |
if (retval >= 0) { |
1056 |
retval = lseek(interpreter_fd, 0, SEEK_SET);
|
1057 |
if(retval >= 0) { |
1058 |
retval = read(interpreter_fd,bprm->buf,128);
|
1059 |
} |
1060 |
} |
1061 |
if (retval >= 0) { |
1062 |
interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */ |
1063 |
interp_elf_ex=*((struct elfhdr *) bprm->buf); /* elf exec-header */ |
1064 |
} |
1065 |
if (retval < 0) { |
1066 |
perror("load_elf_binary3");
|
1067 |
exit(-1);
|
1068 |
free (elf_phdata); |
1069 |
free(elf_interpreter); |
1070 |
close(bprm->fd); |
1071 |
return retval;
|
1072 |
} |
1073 |
} |
1074 |
elf_ppnt++; |
1075 |
} |
1076 |
|
1077 |
/* Some simple consistency checks for the interpreter */
|
1078 |
if (elf_interpreter){
|
1079 |
interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT; |
1080 |
|
1081 |
/* Now figure out which format our binary is */
|
1082 |
if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) &&
|
1083 |
(N_MAGIC(interp_ex) != QMAGIC)) { |
1084 |
interpreter_type = INTERPRETER_ELF; |
1085 |
} |
1086 |
|
1087 |
if (interp_elf_ex.e_ident[0] != 0x7f || |
1088 |
strncmp(&interp_elf_ex.e_ident[1], "ELF",3) != 0) { |
1089 |
interpreter_type &= ~INTERPRETER_ELF; |
1090 |
} |
1091 |
|
1092 |
if (!interpreter_type) {
|
1093 |
free(elf_interpreter); |
1094 |
free(elf_phdata); |
1095 |
close(bprm->fd); |
1096 |
return -ELIBBAD;
|
1097 |
} |
1098 |
} |
1099 |
|
1100 |
/* OK, we are done with that, now set up the arg stuff,
|
1101 |
and then start this sucker up */
|
1102 |
|
1103 |
if (!bprm->sh_bang) {
|
1104 |
char * passed_p;
|
1105 |
|
1106 |
if (interpreter_type == INTERPRETER_AOUT) {
|
1107 |
snprintf(passed_fileno, sizeof(passed_fileno), "%d", bprm->fd); |
1108 |
passed_p = passed_fileno; |
1109 |
|
1110 |
if (elf_interpreter) {
|
1111 |
bprm->p = copy_strings(1,&passed_p,bprm->page,bprm->p);
|
1112 |
bprm->argc++; |
1113 |
} |
1114 |
} |
1115 |
if (!bprm->p) {
|
1116 |
if (elf_interpreter) {
|
1117 |
free(elf_interpreter); |
1118 |
} |
1119 |
free (elf_phdata); |
1120 |
close(bprm->fd); |
1121 |
return -E2BIG;
|
1122 |
} |
1123 |
} |
1124 |
|
1125 |
/* OK, This is the point of no return */
|
1126 |
info->end_data = 0;
|
1127 |
info->end_code = 0;
|
1128 |
info->start_mmap = (unsigned long)ELF_START_MMAP; |
1129 |
info->mmap = 0;
|
1130 |
elf_entry = (unsigned long) elf_ex.e_entry; |
1131 |
|
1132 |
/* Do this so that we can load the interpreter, if need be. We will
|
1133 |
change some of these later */
|
1134 |
info->rss = 0;
|
1135 |
bprm->p = setup_arg_pages(bprm->p, bprm, info); |
1136 |
info->start_stack = bprm->p; |
1137 |
|
1138 |
/* Now we do a little grungy work by mmaping the ELF image into
|
1139 |
* the correct location in memory. At this point, we assume that
|
1140 |
* the image should be loaded at fixed address, not at a variable
|
1141 |
* address.
|
1142 |
*/
|
1143 |
|
1144 |
for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) { |
1145 |
int elf_prot = 0; |
1146 |
int elf_flags = 0; |
1147 |
unsigned long error; |
1148 |
|
1149 |
if (elf_ppnt->p_type != PT_LOAD)
|
1150 |
continue;
|
1151 |
|
1152 |
if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
|
1153 |
if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
|
1154 |
if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
|
1155 |
elf_flags = MAP_PRIVATE | MAP_DENYWRITE; |
1156 |
if (elf_ex.e_type == ET_EXEC || load_addr_set) {
|
1157 |
elf_flags |= MAP_FIXED; |
1158 |
} else if (elf_ex.e_type == ET_DYN) { |
1159 |
/* Try and get dynamic programs out of the way of the default mmap
|
1160 |
base, as well as whatever program they might try to exec. This
|
1161 |
is because the brk will follow the loader, and is not movable. */
|
1162 |
/* NOTE: for qemu, we do a big mmap to get enough space
|
1163 |
without harcoding any address */
|
1164 |
error = target_mmap(0, ET_DYN_MAP_SIZE,
|
1165 |
PROT_NONE, MAP_PRIVATE | MAP_ANON, |
1166 |
-1, 0); |
1167 |
if (error == -1) { |
1168 |
perror("mmap");
|
1169 |
exit(-1);
|
1170 |
} |
1171 |
load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr); |
1172 |
} |
1173 |
|
1174 |
error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr), |
1175 |
(elf_ppnt->p_filesz + |
1176 |
TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), |
1177 |
elf_prot, |
1178 |
(MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), |
1179 |
bprm->fd, |
1180 |
(elf_ppnt->p_offset - |
1181 |
TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); |
1182 |
if (error == -1) { |
1183 |
perror("mmap");
|
1184 |
exit(-1);
|
1185 |
} |
1186 |
|
1187 |
#ifdef LOW_ELF_STACK
|
1188 |
if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack)
|
1189 |
elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr); |
1190 |
#endif
|
1191 |
|
1192 |
if (!load_addr_set) {
|
1193 |
load_addr_set = 1;
|
1194 |
load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset; |
1195 |
if (elf_ex.e_type == ET_DYN) {
|
1196 |
load_bias += error - |
1197 |
TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr); |
1198 |
load_addr += load_bias; |
1199 |
} |
1200 |
} |
1201 |
k = elf_ppnt->p_vaddr; |
1202 |
if (k < start_code)
|
1203 |
start_code = k; |
1204 |
k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; |
1205 |
if (k > elf_bss)
|
1206 |
elf_bss = k; |
1207 |
if ((elf_ppnt->p_flags & PF_X) && end_code < k)
|
1208 |
end_code = k; |
1209 |
if (end_data < k)
|
1210 |
end_data = k; |
1211 |
k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; |
1212 |
if (k > elf_brk) elf_brk = k;
|
1213 |
} |
1214 |
|
1215 |
elf_entry += load_bias; |
1216 |
elf_bss += load_bias; |
1217 |
elf_brk += load_bias; |
1218 |
start_code += load_bias; |
1219 |
end_code += load_bias; |
1220 |
// start_data += load_bias;
|
1221 |
end_data += load_bias; |
1222 |
|
1223 |
if (elf_interpreter) {
|
1224 |
if (interpreter_type & 1) { |
1225 |
elf_entry = load_aout_interp(&interp_ex, interpreter_fd); |
1226 |
} |
1227 |
else if (interpreter_type & 2) { |
1228 |
elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd, |
1229 |
&interp_load_addr); |
1230 |
} |
1231 |
|
1232 |
close(interpreter_fd); |
1233 |
free(elf_interpreter); |
1234 |
|
1235 |
if (elf_entry == ~0UL) { |
1236 |
printf("Unable to load interpreter\n");
|
1237 |
free(elf_phdata); |
1238 |
exit(-1);
|
1239 |
return 0; |
1240 |
} |
1241 |
} |
1242 |
|
1243 |
free(elf_phdata); |
1244 |
|
1245 |
if (loglevel)
|
1246 |
load_symbols(&elf_ex, bprm->fd); |
1247 |
|
1248 |
if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd);
|
1249 |
info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX); |
1250 |
|
1251 |
#ifdef LOW_ELF_STACK
|
1252 |
info->start_stack = bprm->p = elf_stack - 4;
|
1253 |
#endif
|
1254 |
bprm->p = (unsigned long) |
1255 |
create_elf_tables((char *)bprm->p,
|
1256 |
bprm->argc, |
1257 |
bprm->envc, |
1258 |
&elf_ex, |
1259 |
load_addr, load_bias, |
1260 |
interp_load_addr, |
1261 |
(interpreter_type == INTERPRETER_AOUT ? 0 : 1), |
1262 |
info); |
1263 |
if (interpreter_type == INTERPRETER_AOUT)
|
1264 |
info->arg_start += strlen(passed_fileno) + 1;
|
1265 |
info->start_brk = info->brk = elf_brk; |
1266 |
info->end_code = end_code; |
1267 |
info->start_code = start_code; |
1268 |
info->end_data = end_data; |
1269 |
info->start_stack = bprm->p; |
1270 |
|
1271 |
/* Calling set_brk effectively mmaps the pages that we need for the bss and break
|
1272 |
sections */
|
1273 |
set_brk(elf_bss, elf_brk); |
1274 |
|
1275 |
padzero(elf_bss); |
1276 |
|
1277 |
#if 0
|
1278 |
printf("(start_brk) %x\n" , info->start_brk);
|
1279 |
printf("(end_code) %x\n" , info->end_code);
|
1280 |
printf("(start_code) %x\n" , info->start_code);
|
1281 |
printf("(end_data) %x\n" , info->end_data);
|
1282 |
printf("(start_stack) %x\n" , info->start_stack);
|
1283 |
printf("(brk) %x\n" , info->brk);
|
1284 |
#endif
|
1285 |
|
1286 |
if ( info->personality == PER_SVR4 )
|
1287 |
{ |
1288 |
/* Why this, you ask??? Well SVr4 maps page 0 as read-only,
|
1289 |
and some applications "depend" upon this behavior.
|
1290 |
Since we do not have the power to recompile these, we
|
1291 |
emulate the SVr4 behavior. Sigh. */
|
1292 |
mapped_addr = target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
|
1293 |
MAP_FIXED | MAP_PRIVATE, -1, 0); |
1294 |
} |
1295 |
|
1296 |
#ifdef ELF_PLAT_INIT
|
1297 |
/*
|
1298 |
* The ABI may specify that certain registers be set up in special
|
1299 |
* ways (on i386 %edx is the address of a DT_FINI function, for
|
1300 |
* example. This macro performs whatever initialization to
|
1301 |
* the regs structure is required.
|
1302 |
*/
|
1303 |
ELF_PLAT_INIT(regs); |
1304 |
#endif
|
1305 |
|
1306 |
|
1307 |
info->entry = elf_entry; |
1308 |
|
1309 |
return 0; |
1310 |
} |
1311 |
|
1312 |
|
1313 |
|
1314 |
int elf_exec(const char * filename, char ** argv, char ** envp, |
1315 |
struct target_pt_regs * regs, struct image_info *infop) |
1316 |
{ |
1317 |
struct linux_binprm bprm;
|
1318 |
int retval;
|
1319 |
int i;
|
1320 |
|
1321 |
bprm.p = TARGET_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int); |
1322 |
for (i=0 ; i<MAX_ARG_PAGES ; i++) /* clear page-table */ |
1323 |
bprm.page[i] = 0;
|
1324 |
retval = open(filename, O_RDONLY); |
1325 |
if (retval < 0) |
1326 |
return retval;
|
1327 |
bprm.fd = retval; |
1328 |
bprm.filename = (char *)filename;
|
1329 |
bprm.sh_bang = 0;
|
1330 |
bprm.loader = 0;
|
1331 |
bprm.exec = 0;
|
1332 |
bprm.dont_iput = 0;
|
1333 |
bprm.argc = count(argv); |
1334 |
bprm.envc = count(envp); |
1335 |
|
1336 |
retval = prepare_binprm(&bprm); |
1337 |
|
1338 |
if(retval>=0) { |
1339 |
bprm.p = copy_strings(1, &bprm.filename, bprm.page, bprm.p);
|
1340 |
bprm.exec = bprm.p; |
1341 |
bprm.p = copy_strings(bprm.envc,envp,bprm.page,bprm.p); |
1342 |
bprm.p = copy_strings(bprm.argc,argv,bprm.page,bprm.p); |
1343 |
if (!bprm.p) {
|
1344 |
retval = -E2BIG; |
1345 |
} |
1346 |
} |
1347 |
|
1348 |
if(retval>=0) { |
1349 |
retval = load_elf_binary(&bprm,regs,infop); |
1350 |
} |
1351 |
if(retval>=0) { |
1352 |
/* success. Initialize important registers */
|
1353 |
init_thread(regs, infop); |
1354 |
return retval;
|
1355 |
} |
1356 |
|
1357 |
/* Something went wrong, return the inode and free the argument pages*/
|
1358 |
for (i=0 ; i<MAX_ARG_PAGES ; i++) { |
1359 |
free_page((void *)bprm.page[i]);
|
1360 |
} |
1361 |
return(retval);
|
1362 |
} |
1363 |
|
1364 |
|
1365 |
static int load_aout_interp(void * exptr, int interp_fd) |
1366 |
{ |
1367 |
printf("a.out interpreter not yet supported\n");
|
1368 |
return(0); |
1369 |
} |
1370 |
|