diff options
Diffstat (limited to 'linux-user/elfload.c')
| -rw-r--r-- | linux-user/elfload.c | 1240 |
1 files changed, 0 insertions, 1240 deletions
diff --git a/linux-user/elfload.c b/linux-user/elfload.c deleted file mode 100644 index 57b5ed2..0000000 --- a/linux-user/elfload.c +++ /dev/null @@ -1,1240 +0,0 @@ -/* This is the Linux kernel elf-loading code, ported into user space */ - -#include <stdio.h> -#include <sys/types.h> -#include <fcntl.h> -#include <errno.h> -#include <unistd.h> -#include <sys/mman.h> -#include <stdlib.h> -#include <string.h> - -#include "qemu.h" -#include "disas.h" - -/* this flag is uneffective under linux too, should be deleted */ -#ifndef MAP_DENYWRITE -#define MAP_DENYWRITE 0 -#endif - -/* should probably go in elf.h */ -#ifndef ELIBBAD -#define ELIBBAD 80 -#endif - -#ifdef TARGET_I386 - -#define ELF_PLATFORM get_elf_platform() - -static const char *get_elf_platform(void) -{ - static char elf_platform[] = "i386"; - int family = (global_env->cpuid_version >> 8) & 0xff; - if (family > 6) - family = 6; - if (family >= 3) - elf_platform[1] = '0' + family; - return elf_platform; -} - -#define ELF_HWCAP get_elf_hwcap() - -static uint32_t get_elf_hwcap(void) -{ - return global_env->cpuid_features; -} - -#define ELF_START_MMAP 0x80000000 - -/* - * This is used to ensure we don't load something for the wrong architecture. - */ -#define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) ) - -/* - * These are used to set parameters in the core dumps. - */ -#define ELF_CLASS ELFCLASS32 -#define ELF_DATA ELFDATA2LSB -#define ELF_ARCH EM_386 - -static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) -{ - regs->esp = infop->start_stack; - regs->eip = infop->entry; - - /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program - starts %edx contains a pointer to a function which might be - registered using `atexit'. This provides a mean for the - dynamic linker to call DT_FINI functions for shared libraries - that have been loaded before the code runs. - - A value of 0 tells we have no such handler. */ - regs->edx = 0; -} - -#define USE_ELF_CORE_DUMP -#define ELF_EXEC_PAGESIZE 4096 - -#endif - -#ifdef TARGET_ARM - -#define ELF_START_MMAP 0x80000000 - -#define elf_check_arch(x) ( (x) == EM_ARM ) - -#define ELF_CLASS ELFCLASS32 -#ifdef TARGET_WORDS_BIGENDIAN -#define ELF_DATA ELFDATA2MSB -#else -#define ELF_DATA ELFDATA2LSB -#endif -#define ELF_ARCH EM_ARM - -static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) -{ - target_long stack = infop->start_stack; - memset(regs, 0, sizeof(*regs)); - regs->ARM_cpsr = 0x10; - if (infop->entry & 1) - regs->ARM_cpsr |= CPSR_T; - regs->ARM_pc = infop->entry & 0xfffffffe; - regs->ARM_sp = infop->start_stack; - regs->ARM_r2 = tgetl(stack + 8); /* envp */ - regs->ARM_r1 = tgetl(stack + 4); /* envp */ - /* XXX: it seems that r0 is zeroed after ! */ - regs->ARM_r0 = 0; - /* For uClinux PIC binaries. */ - regs->ARM_r10 = infop->start_data; -} - -#define USE_ELF_CORE_DUMP -#define ELF_EXEC_PAGESIZE 4096 - -enum -{ - ARM_HWCAP_ARM_SWP = 1 << 0, - ARM_HWCAP_ARM_HALF = 1 << 1, - ARM_HWCAP_ARM_THUMB = 1 << 2, - ARM_HWCAP_ARM_26BIT = 1 << 3, - ARM_HWCAP_ARM_FAST_MULT = 1 << 4, - ARM_HWCAP_ARM_FPA = 1 << 5, - ARM_HWCAP_ARM_VFP = 1 << 6, - ARM_HWCAP_ARM_EDSP = 1 << 7, -}; - -#define ELF_HWCAP (ARM_HWCAP_ARM_SWP | ARM_HWCAP_ARM_HALF \ - | ARM_HWCAP_ARM_THUMB | ARM_HWCAP_ARM_FAST_MULT \ - | ARM_HWCAP_ARM_FPA | ARM_HWCAP_ARM_VFP) - -#endif - -#ifdef TARGET_SPARC -#ifdef TARGET_SPARC64 - -#define ELF_START_MMAP 0x80000000 - -#define elf_check_arch(x) ( (x) == EM_SPARCV9 ) - -#define ELF_CLASS ELFCLASS64 -#define ELF_DATA ELFDATA2MSB -#define ELF_ARCH EM_SPARCV9 - -#define STACK_BIAS 2047 - -static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) -{ - regs->tstate = 0; - regs->pc = infop->entry; - regs->npc = regs->pc + 4; - regs->y = 0; - regs->u_regs[14] = infop->start_stack - 16 * 8 - STACK_BIAS; -} - -#else -#define ELF_START_MMAP 0x80000000 - -#define elf_check_arch(x) ( (x) == EM_SPARC ) - -#define ELF_CLASS ELFCLASS32 -#define ELF_DATA ELFDATA2MSB -#define ELF_ARCH EM_SPARC - -static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) -{ - regs->psr = 0; - regs->pc = infop->entry; - regs->npc = regs->pc + 4; - regs->y = 0; - regs->u_regs[14] = infop->start_stack - 16 * 4; -} - -#endif -#endif - -#ifdef TARGET_PPC - -#define ELF_START_MMAP 0x80000000 - -#define elf_check_arch(x) ( (x) == EM_PPC ) - -#define ELF_CLASS ELFCLASS32 -#ifdef TARGET_WORDS_BIGENDIAN -#define ELF_DATA ELFDATA2MSB -#else -#define ELF_DATA ELFDATA2LSB -#endif -#define ELF_ARCH EM_PPC - -/* - * We need to put in some extra aux table entries to tell glibc what - * the cache block size is, so it can use the dcbz instruction safely. - */ -#define AT_DCACHEBSIZE 19 -#define AT_ICACHEBSIZE 20 -#define AT_UCACHEBSIZE 21 -/* A special ignored type value for PPC, for glibc compatibility. */ -#define AT_IGNOREPPC 22 -/* - * The requirements here are: - * - keep the final alignment of sp (sp & 0xf) - * - make sure the 32-bit value at the first 16 byte aligned position of - * AUXV is greater than 16 for glibc compatibility. - * AT_IGNOREPPC is used for that. - * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC, - * even if DLINFO_ARCH_ITEMS goes to zero or is undefined. - */ -#define DLINFO_ARCH_ITEMS 5 -#define ARCH_DLINFO \ -do { \ - NEW_AUX_ENT(AT_DCACHEBSIZE, 0x20); \ - NEW_AUX_ENT(AT_ICACHEBSIZE, 0x20); \ - NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \ - /* \ - * Now handle glibc compatibility. \ - */ \ - NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \ - NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \ - } while (0) - -static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop) -{ - target_ulong pos = infop->start_stack; - target_ulong tmp; - - _regs->msr = 1 << MSR_PR; /* Set user mode */ - _regs->gpr[1] = infop->start_stack; - _regs->nip = infop->entry; - /* Note that isn't exactly what regular kernel does - * but this is what the ABI wants and is needed to allow - * execution of PPC BSD programs. - */ - _regs->gpr[3] = tgetl(pos); - pos += sizeof(target_ulong); - _regs->gpr[4] = pos; - for (tmp = 1; tmp != 0; pos += sizeof(target_ulong)) - tmp = ldl(pos); - _regs->gpr[5] = pos; -} - -#define USE_ELF_CORE_DUMP -#define ELF_EXEC_PAGESIZE 4096 - -#endif - -#ifdef TARGET_MIPS - -#define ELF_START_MMAP 0x80000000 - -#define elf_check_arch(x) ( (x) == EM_MIPS ) - -#define ELF_CLASS ELFCLASS32 -#ifdef TARGET_WORDS_BIGENDIAN -#define ELF_DATA ELFDATA2MSB -#else -#define ELF_DATA ELFDATA2LSB -#endif -#define ELF_ARCH EM_MIPS - -static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) -{ - regs->cp0_status = CP0St_UM; - regs->cp0_epc = infop->entry; - regs->regs[29] = infop->start_stack; -} - -#endif /* TARGET_MIPS */ - -#ifdef TARGET_SH4 - -#define ELF_START_MMAP 0x80000000 - -#define elf_check_arch(x) ( (x) == EM_SH ) - -#define ELF_CLASS ELFCLASS32 -#define ELF_DATA ELFDATA2LSB -#define ELF_ARCH EM_SH - -static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) -{ - /* Check other registers XXXXX */ - regs->pc = infop->entry; - regs->regs[15] = infop->start_stack - 16 * 4; -} - -#define USE_ELF_CORE_DUMP -#define ELF_EXEC_PAGESIZE 4096 - -#endif - -#ifndef ELF_PLATFORM -#define ELF_PLATFORM (NULL) -#endif - -#ifndef ELF_HWCAP -#define ELF_HWCAP 0 -#endif - -#include "elf.h" - -struct exec -{ - unsigned int a_info; /* Use macros N_MAGIC, etc for access */ - unsigned int a_text; /* length of text, in bytes */ - unsigned int a_data; /* length of data, in bytes */ - unsigned int a_bss; /* length of uninitialized data area, in bytes */ - unsigned int a_syms; /* length of symbol table data in file, in bytes */ - unsigned int a_entry; /* start address */ - unsigned int a_trsize; /* length of relocation info for text, in bytes */ - unsigned int a_drsize; /* length of relocation info for data, in bytes */ -}; - - -#define N_MAGIC(exec) ((exec).a_info & 0xffff) -#define OMAGIC 0407 -#define NMAGIC 0410 -#define ZMAGIC 0413 -#define QMAGIC 0314 - -/* max code+data+bss space allocated to elf interpreter */ -#define INTERP_MAP_SIZE (32 * 1024 * 1024) - -/* max code+data+bss+brk space allocated to ET_DYN executables */ -#define ET_DYN_MAP_SIZE (128 * 1024 * 1024) - -/* from personality.h */ - -/* Flags for bug emulation. These occupy the top three bytes. */ -#define STICKY_TIMEOUTS 0x4000000 -#define WHOLE_SECONDS 0x2000000 - -/* Personality types. These go in the low byte. Avoid using the top bit, - * it will conflict with error returns. - */ -#define PER_MASK (0x00ff) -#define PER_LINUX (0x0000) -#define PER_SVR4 (0x0001 | STICKY_TIMEOUTS) -#define PER_SVR3 (0x0002 | STICKY_TIMEOUTS) -#define PER_SCOSVR3 (0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS) -#define PER_WYSEV386 (0x0004 | STICKY_TIMEOUTS) -#define PER_ISCR4 (0x0005 | STICKY_TIMEOUTS) -#define PER_BSD (0x0006) -#define PER_XENIX (0x0007 | STICKY_TIMEOUTS) - -/* Necessary parameters */ -#define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE -#define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1)) -#define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1)) - -#define INTERPRETER_NONE 0 -#define INTERPRETER_AOUT 1 -#define INTERPRETER_ELF 2 - -#define DLINFO_ITEMS 12 - -static inline void memcpy_fromfs(void * to, const void * from, unsigned long n) -{ - memcpy(to, from, n); -} - -extern unsigned long x86_stack_size; - -static int load_aout_interp(void * exptr, int interp_fd); - -#ifdef BSWAP_NEEDED -static void bswap_ehdr(struct elfhdr *ehdr) -{ - bswap16s(&ehdr->e_type); /* Object file type */ - bswap16s(&ehdr->e_machine); /* Architecture */ - bswap32s(&ehdr->e_version); /* Object file version */ - bswaptls(&ehdr->e_entry); /* Entry point virtual address */ - bswaptls(&ehdr->e_phoff); /* Program header table file offset */ - bswaptls(&ehdr->e_shoff); /* Section header table file offset */ - bswap32s(&ehdr->e_flags); /* Processor-specific flags */ - bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */ - bswap16s(&ehdr->e_phentsize); /* Program header table entry size */ - bswap16s(&ehdr->e_phnum); /* Program header table entry count */ - bswap16s(&ehdr->e_shentsize); /* Section header table entry size */ - bswap16s(&ehdr->e_shnum); /* Section header table entry count */ - bswap16s(&ehdr->e_shstrndx); /* Section header string table index */ -} - -static void bswap_phdr(struct elf_phdr *phdr) -{ - bswap32s(&phdr->p_type); /* Segment type */ - bswaptls(&phdr->p_offset); /* Segment file offset */ - bswaptls(&phdr->p_vaddr); /* Segment virtual address */ - bswaptls(&phdr->p_paddr); /* Segment physical address */ - bswaptls(&phdr->p_filesz); /* Segment size in file */ - bswaptls(&phdr->p_memsz); /* Segment size in memory */ - bswap32s(&phdr->p_flags); /* Segment flags */ - bswaptls(&phdr->p_align); /* Segment alignment */ -} - -static void bswap_shdr(struct elf_shdr *shdr) -{ - bswap32s(&shdr->sh_name); - bswap32s(&shdr->sh_type); - bswaptls(&shdr->sh_flags); - bswaptls(&shdr->sh_addr); - bswaptls(&shdr->sh_offset); - bswaptls(&shdr->sh_size); - bswap32s(&shdr->sh_link); - bswap32s(&shdr->sh_info); - bswaptls(&shdr->sh_addralign); - bswaptls(&shdr->sh_entsize); -} - -static void bswap_sym(Elf32_Sym *sym) -{ - bswap32s(&sym->st_name); - bswap32s(&sym->st_value); - bswap32s(&sym->st_size); - bswap16s(&sym->st_shndx); -} -#endif - -/* - * 'copy_elf_strings()' copies argument/envelope strings from user - * memory to free pages in kernel mem. These are in a format ready - * to be put directly into the top of new user memory. - * - */ -static unsigned long copy_elf_strings(int argc,char ** argv, void **page, - unsigned long p) -{ - char *tmp, *tmp1, *pag = NULL; - int len, offset = 0; - - if (!p) { - return 0; /* bullet-proofing */ - } - while (argc-- > 0) { - tmp = argv[argc]; - if (!tmp) { - fprintf(stderr, "VFS: argc is wrong"); - exit(-1); - } - tmp1 = tmp; - while (*tmp++); - len = tmp - tmp1; - if (p < len) { /* this shouldn't happen - 128kB */ - return 0; - } - while (len) { - --p; --tmp; --len; - if (--offset < 0) { - offset = p % TARGET_PAGE_SIZE; - pag = (char *)page[p/TARGET_PAGE_SIZE]; - if (!pag) { - pag = (char *)malloc(TARGET_PAGE_SIZE); - page[p/TARGET_PAGE_SIZE] = pag; - if (!pag) - return 0; - } - } - if (len == 0 || offset == 0) { - *(pag + offset) = *tmp; - } - else { - int bytes_to_copy = (len > offset) ? offset : len; - tmp -= bytes_to_copy; - p -= bytes_to_copy; - offset -= bytes_to_copy; - len -= bytes_to_copy; - memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1); - } - } - } - return p; -} - -unsigned long setup_arg_pages(target_ulong p, struct linux_binprm * bprm, - struct image_info * info) -{ - target_ulong stack_base, size, error; - int i; - - /* Create enough stack to hold everything. If we don't use - * it for args, we'll use it for something else... - */ - size = x86_stack_size; - if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE) - size = MAX_ARG_PAGES*TARGET_PAGE_SIZE; - error = target_mmap(0, - size + qemu_host_page_size, - PROT_READ | PROT_WRITE, - MAP_PRIVATE | MAP_ANONYMOUS, - -1, 0); - if (error == -1) { - perror("stk mmap"); - exit(-1); - } - /* we reserve one extra page at the top of the stack as guard */ - target_mprotect(error + size, qemu_host_page_size, PROT_NONE); - - stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE; - p += stack_base; - - for (i = 0 ; i < MAX_ARG_PAGES ; i++) { - if (bprm->page[i]) { - info->rss++; - - memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE); - free(bprm->page[i]); - } - stack_base += TARGET_PAGE_SIZE; - } - return p; -} - -static void set_brk(unsigned long start, unsigned long end) -{ - /* page-align the start and end addresses... */ - start = HOST_PAGE_ALIGN(start); - end = HOST_PAGE_ALIGN(end); - if (end <= start) - return; - if(target_mmap(start, end - start, - PROT_READ | PROT_WRITE | PROT_EXEC, - MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) { - perror("cannot mmap brk"); - exit(-1); - } -} - - -/* We need to explicitly zero any fractional pages after the data - section (i.e. bss). This would contain the junk from the file that - should not be in memory. */ -static void padzero(unsigned long elf_bss) -{ - unsigned long nbyte; - - /* XXX: this is really a hack : if the real host page size is - smaller than the target page size, some pages after the end - of the file may not be mapped. A better fix would be to - patch target_mmap(), but it is more complicated as the file - size must be known */ - if (qemu_real_host_page_size < qemu_host_page_size) { - unsigned long end_addr, end_addr1; - end_addr1 = (elf_bss + qemu_real_host_page_size - 1) & - ~(qemu_real_host_page_size - 1); - end_addr = HOST_PAGE_ALIGN(elf_bss); - if (end_addr1 < end_addr) { - mmap((void *)end_addr1, end_addr - end_addr1, - PROT_READ|PROT_WRITE|PROT_EXEC, - MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); - } - } - - nbyte = elf_bss & (qemu_host_page_size-1); - if (nbyte) { - nbyte = qemu_host_page_size - nbyte; - do { - tput8(elf_bss, 0); - elf_bss++; - } while (--nbyte); - } -} - - -static unsigned long create_elf_tables(target_ulong p, int argc, int envc, - struct elfhdr * exec, - unsigned long load_addr, - unsigned long load_bias, - unsigned long interp_load_addr, int ibcs, - struct image_info *info) -{ - target_ulong sp; - int size; - target_ulong u_platform; - const char *k_platform; - const int n = sizeof(target_ulong); - - sp = p; - u_platform = 0; - k_platform = ELF_PLATFORM; - if (k_platform) { - size_t len = strlen(k_platform) + 1; - sp -= (len + n - 1) & ~(n - 1); - u_platform = sp; - memcpy_to_target(sp, k_platform, len); - } - /* - * Force 16 byte _final_ alignment here for generality. - */ - sp = sp &~ (target_ulong)15; - size = (DLINFO_ITEMS + 1) * 2; - if (k_platform) - size += 2; -#ifdef DLINFO_ARCH_ITEMS - size += DLINFO_ARCH_ITEMS * 2; -#endif - size += envc + argc + 2; - size += (!ibcs ? 3 : 1); /* argc itself */ - size *= n; - if (size & 15) - sp -= 16 - (size & 15); - -#define NEW_AUX_ENT(id, val) do { \ - sp -= n; tputl(sp, val); \ - sp -= n; tputl(sp, id); \ - } while(0) - NEW_AUX_ENT (AT_NULL, 0); - - /* There must be exactly DLINFO_ITEMS entries here. */ - NEW_AUX_ENT(AT_PHDR, (target_ulong)(load_addr + exec->e_phoff)); - NEW_AUX_ENT(AT_PHENT, (target_ulong)(sizeof (struct elf_phdr))); - NEW_AUX_ENT(AT_PHNUM, (target_ulong)(exec->e_phnum)); - NEW_AUX_ENT(AT_PAGESZ, (target_ulong)(TARGET_PAGE_SIZE)); - NEW_AUX_ENT(AT_BASE, (target_ulong)(interp_load_addr)); - NEW_AUX_ENT(AT_FLAGS, (target_ulong)0); - NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry); - NEW_AUX_ENT(AT_UID, (target_ulong) getuid()); - NEW_AUX_ENT(AT_EUID, (target_ulong) geteuid()); - NEW_AUX_ENT(AT_GID, (target_ulong) getgid()); - NEW_AUX_ENT(AT_EGID, (target_ulong) getegid()); - NEW_AUX_ENT(AT_HWCAP, (target_ulong) ELF_HWCAP); - if (k_platform) - NEW_AUX_ENT(AT_PLATFORM, u_platform); -#ifdef ARCH_DLINFO - /* - * ARCH_DLINFO must come last so platform specific code can enforce - * special alignment requirements on the AUXV if necessary (eg. PPC). - */ - ARCH_DLINFO; -#endif -#undef NEW_AUX_ENT - - sp = loader_build_argptr(envc, argc, sp, p, !ibcs); - return sp; -} - - -static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex, - int interpreter_fd, - unsigned long *interp_load_addr) -{ - struct elf_phdr *elf_phdata = NULL; - struct elf_phdr *eppnt; - unsigned long load_addr = 0; - int load_addr_set = 0; - int retval; - unsigned long last_bss, elf_bss; - unsigned long error; - int i; - - elf_bss = 0; - last_bss = 0; - error = 0; - -#ifdef BSWAP_NEEDED - bswap_ehdr(interp_elf_ex); -#endif - /* First of all, some simple consistency checks */ - if ((interp_elf_ex->e_type != ET_EXEC && - interp_elf_ex->e_type != ET_DYN) || - !elf_check_arch(interp_elf_ex->e_machine)) { - return ~0UL; - } - - - /* Now read in all of the header information */ - - if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE) - return ~0UL; - - elf_phdata = (struct elf_phdr *) - malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); - - if (!elf_phdata) - return ~0UL; - - /* - * If the size of this structure has changed, then punt, since - * we will be doing the wrong thing. - */ - if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) { - free(elf_phdata); - return ~0UL; - } - - retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET); - if(retval >= 0) { - retval = read(interpreter_fd, - (char *) elf_phdata, - sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); - } - if (retval < 0) { - perror("load_elf_interp"); - exit(-1); - free (elf_phdata); - return retval; - } -#ifdef BSWAP_NEEDED - eppnt = elf_phdata; - for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) { - bswap_phdr(eppnt); - } -#endif - - if (interp_elf_ex->e_type == ET_DYN) { - /* in order to avoid harcoding the interpreter load - address in qemu, we allocate a big enough memory zone */ - error = target_mmap(0, INTERP_MAP_SIZE, - PROT_NONE, MAP_PRIVATE | MAP_ANON, - -1, 0); - if (error == -1) { - perror("mmap"); - exit(-1); - } - load_addr = error; - load_addr_set = 1; - } - - eppnt = elf_phdata; - for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) - if (eppnt->p_type == PT_LOAD) { - int elf_type = MAP_PRIVATE | MAP_DENYWRITE; - int elf_prot = 0; - unsigned long vaddr = 0; - unsigned long k; - - if (eppnt->p_flags & PF_R) elf_prot = PROT_READ; - if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; - if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; - if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) { - elf_type |= MAP_FIXED; - vaddr = eppnt->p_vaddr; - } - error = target_mmap(load_addr+TARGET_ELF_PAGESTART(vaddr), - eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr), - elf_prot, - elf_type, - interpreter_fd, - eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr)); - - if (error == -1) { - /* Real error */ - close(interpreter_fd); - free(elf_phdata); - return ~0UL; - } - - if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) { - load_addr = error; - load_addr_set = 1; - } - - /* - * Find the end of the file mapping for this phdr, and keep - * track of the largest address we see for this. - */ - k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; - if (k > elf_bss) elf_bss = k; - - /* - * Do the same thing for the memory mapping - between - * elf_bss and last_bss is the bss section. - */ - k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; - if (k > last_bss) last_bss = k; - } - - /* Now use mmap to map the library into memory. */ - - close(interpreter_fd); - - /* - * Now fill out the bss section. First pad the last page up - * to the page boundary, and then perform a mmap to make sure - * that there are zeromapped pages up to and including the last - * bss page. - */ - padzero(elf_bss); - elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */ - - /* Map the last of the bss segment */ - if (last_bss > elf_bss) { - target_mmap(elf_bss, last_bss-elf_bss, - PROT_READ|PROT_WRITE|PROT_EXEC, - MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); - } - free(elf_phdata); - - *interp_load_addr = load_addr; - return ((unsigned long) interp_elf_ex->e_entry) + load_addr; -} - -/* Best attempt to load symbols from this ELF object. */ -static void load_symbols(struct elfhdr *hdr, int fd) -{ - unsigned int i; - struct elf_shdr sechdr, symtab, strtab; - char *strings; - struct syminfo *s; - - lseek(fd, hdr->e_shoff, SEEK_SET); - for (i = 0; i < hdr->e_shnum; i++) { - if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr)) - return; -#ifdef BSWAP_NEEDED - bswap_shdr(&sechdr); -#endif - if (sechdr.sh_type == SHT_SYMTAB) { - symtab = sechdr; - lseek(fd, hdr->e_shoff - + sizeof(sechdr) * sechdr.sh_link, SEEK_SET); - if (read(fd, &strtab, sizeof(strtab)) - != sizeof(strtab)) - return; -#ifdef BSWAP_NEEDED - bswap_shdr(&strtab); -#endif - goto found; - } - } - return; /* Shouldn't happen... */ - - found: - /* Now know where the strtab and symtab are. Snarf them. */ - s = malloc(sizeof(*s)); - s->disas_symtab = malloc(symtab.sh_size); - s->disas_strtab = strings = malloc(strtab.sh_size); - if (!s->disas_symtab || !s->disas_strtab) - return; - - lseek(fd, symtab.sh_offset, SEEK_SET); - if (read(fd, s->disas_symtab, symtab.sh_size) != symtab.sh_size) - return; - -#ifdef BSWAP_NEEDED - for (i = 0; i < symtab.sh_size / sizeof(struct elf_sym); i++) - bswap_sym(s->disas_symtab + sizeof(struct elf_sym)*i); -#endif - - lseek(fd, strtab.sh_offset, SEEK_SET); - if (read(fd, strings, strtab.sh_size) != strtab.sh_size) - return; - s->disas_num_syms = symtab.sh_size / sizeof(struct elf_sym); - s->next = syminfos; - syminfos = s; -} - -int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs, - struct image_info * info) -{ - struct elfhdr elf_ex; - struct elfhdr interp_elf_ex; - struct exec interp_ex; - int interpreter_fd = -1; /* avoid warning */ - unsigned long load_addr, load_bias; - int load_addr_set = 0; - unsigned int interpreter_type = INTERPRETER_NONE; - unsigned char ibcs2_interpreter; - int i; - unsigned long mapped_addr; - struct elf_phdr * elf_ppnt; - struct elf_phdr *elf_phdata; - unsigned long elf_bss, k, elf_brk; - int retval; - char * elf_interpreter; - unsigned long elf_entry, interp_load_addr = 0; - int status; - unsigned long start_code, end_code, end_data; - unsigned long elf_stack; - char passed_fileno[6]; - - ibcs2_interpreter = 0; - status = 0; - load_addr = 0; - load_bias = 0; - elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */ -#ifdef BSWAP_NEEDED - bswap_ehdr(&elf_ex); -#endif - - /* First of all, some simple consistency checks */ - if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) || - (! elf_check_arch(elf_ex.e_machine))) { - return -ENOEXEC; - } - - bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p); - bprm->p = copy_elf_strings(bprm->envc,bprm->envp,bprm->page,bprm->p); - bprm->p = copy_elf_strings(bprm->argc,bprm->argv,bprm->page,bprm->p); - if (!bprm->p) { - retval = -E2BIG; - } - - /* Now read in all of the header information */ - elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum); - if (elf_phdata == NULL) { - return -ENOMEM; - } - - retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET); - if(retval > 0) { - retval = read(bprm->fd, (char *) elf_phdata, - elf_ex.e_phentsize * elf_ex.e_phnum); - } - - if (retval < 0) { - perror("load_elf_binary"); - exit(-1); - free (elf_phdata); - return -errno; - } - -#ifdef BSWAP_NEEDED - elf_ppnt = elf_phdata; - for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) { - bswap_phdr(elf_ppnt); - } -#endif - elf_ppnt = elf_phdata; - - elf_bss = 0; - elf_brk = 0; - - - elf_stack = ~0UL; - elf_interpreter = NULL; - start_code = ~0UL; - end_code = 0; - end_data = 0; - - for(i=0;i < elf_ex.e_phnum; i++) { - if (elf_ppnt->p_type == PT_INTERP) { - if ( elf_interpreter != NULL ) - { - free (elf_phdata); - free(elf_interpreter); - close(bprm->fd); - return -EINVAL; - } - - /* This is the program interpreter used for - * shared libraries - for now assume that this - * is an a.out format binary - */ - - elf_interpreter = (char *)malloc(elf_ppnt->p_filesz); - - if (elf_interpreter == NULL) { - free (elf_phdata); - close(bprm->fd); - return -ENOMEM; - } - - retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET); - if(retval >= 0) { - retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz); - } - if(retval < 0) { - perror("load_elf_binary2"); - exit(-1); - } - - /* If the program interpreter is one of these two, - then assume an iBCS2 image. Otherwise assume - a native linux image. */ - - /* JRP - Need to add X86 lib dir stuff here... */ - - if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 || - strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) { - ibcs2_interpreter = 1; - } - -#if 0 - printf("Using ELF interpreter %s\n", elf_interpreter); -#endif - if (retval >= 0) { - retval = open(path(elf_interpreter), O_RDONLY); - if(retval >= 0) { - interpreter_fd = retval; - } - else { - perror(elf_interpreter); - exit(-1); - /* retval = -errno; */ - } - } - - if (retval >= 0) { - retval = lseek(interpreter_fd, 0, SEEK_SET); - if(retval >= 0) { - retval = read(interpreter_fd,bprm->buf,128); - } - } - if (retval >= 0) { - interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */ - interp_elf_ex=*((struct elfhdr *) bprm->buf); /* elf exec-header */ - } - if (retval < 0) { - perror("load_elf_binary3"); - exit(-1); - free (elf_phdata); - free(elf_interpreter); - close(bprm->fd); - return retval; - } - } - elf_ppnt++; - } - - /* Some simple consistency checks for the interpreter */ - if (elf_interpreter){ - interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT; - - /* Now figure out which format our binary is */ - if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) && - (N_MAGIC(interp_ex) != QMAGIC)) { - interpreter_type = INTERPRETER_ELF; - } - - if (interp_elf_ex.e_ident[0] != 0x7f || - strncmp(&interp_elf_ex.e_ident[1], "ELF",3) != 0) { - interpreter_type &= ~INTERPRETER_ELF; - } - - if (!interpreter_type) { - free(elf_interpreter); - free(elf_phdata); - close(bprm->fd); - return -ELIBBAD; - } - } - - /* OK, we are done with that, now set up the arg stuff, - and then start this sucker up */ - - { - char * passed_p; - - if (interpreter_type == INTERPRETER_AOUT) { - snprintf(passed_fileno, sizeof(passed_fileno), "%d", bprm->fd); - passed_p = passed_fileno; - - if (elf_interpreter) { - bprm->p = copy_elf_strings(1,&passed_p,bprm->page,bprm->p); - bprm->argc++; - } - } - if (!bprm->p) { - if (elf_interpreter) { - free(elf_interpreter); - } - free (elf_phdata); - close(bprm->fd); - return -E2BIG; - } - } - - /* OK, This is the point of no return */ - info->end_data = 0; - info->end_code = 0; - info->start_mmap = (unsigned long)ELF_START_MMAP; - info->mmap = 0; - elf_entry = (unsigned long) elf_ex.e_entry; - - /* Do this so that we can load the interpreter, if need be. We will - change some of these later */ - info->rss = 0; - bprm->p = setup_arg_pages(bprm->p, bprm, info); - info->start_stack = bprm->p; - - /* Now we do a little grungy work by mmaping the ELF image into - * the correct location in memory. At this point, we assume that - * the image should be loaded at fixed address, not at a variable - * address. - */ - - for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) { - int elf_prot = 0; - int elf_flags = 0; - unsigned long error; - - if (elf_ppnt->p_type != PT_LOAD) - continue; - - if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ; - if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; - if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; - elf_flags = MAP_PRIVATE | MAP_DENYWRITE; - if (elf_ex.e_type == ET_EXEC || load_addr_set) { - elf_flags |= MAP_FIXED; - } else if (elf_ex.e_type == ET_DYN) { - /* Try and get dynamic programs out of the way of the default mmap - base, as well as whatever program they might try to exec. This - is because the brk will follow the loader, and is not movable. */ - /* NOTE: for qemu, we do a big mmap to get enough space - without harcoding any address */ - error = target_mmap(0, ET_DYN_MAP_SIZE, - PROT_NONE, MAP_PRIVATE | MAP_ANON, - -1, 0); - if (error == -1) { - perror("mmap"); - exit(-1); - } - load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr); - } - - error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr), - (elf_ppnt->p_filesz + - TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), - elf_prot, - (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), - bprm->fd, - (elf_ppnt->p_offset - - TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); - if (error == -1) { - perror("mmap"); - exit(-1); - } - -#ifdef LOW_ELF_STACK - if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack) - elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr); -#endif - - if (!load_addr_set) { - load_addr_set = 1; - load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset; - if (elf_ex.e_type == ET_DYN) { - load_bias += error - - TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr); - load_addr += load_bias; - } - } - k = elf_ppnt->p_vaddr; - if (k < start_code) - start_code = k; - k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; - if (k > elf_bss) - elf_bss = k; - if ((elf_ppnt->p_flags & PF_X) && end_code < k) - end_code = k; - if (end_data < k) - end_data = k; - k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; - if (k > elf_brk) elf_brk = k; - } - - elf_entry += load_bias; - elf_bss += load_bias; - elf_brk += load_bias; - start_code += load_bias; - end_code += load_bias; - // start_data += load_bias; - end_data += load_bias; - - if (elf_interpreter) { - if (interpreter_type & 1) { - elf_entry = load_aout_interp(&interp_ex, interpreter_fd); - } - else if (interpreter_type & 2) { - elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd, - &interp_load_addr); - } - - close(interpreter_fd); - free(elf_interpreter); - - if (elf_entry == ~0UL) { - printf("Unable to load interpreter\n"); - free(elf_phdata); - exit(-1); - return 0; - } - } - - free(elf_phdata); - - if (loglevel) - load_symbols(&elf_ex, bprm->fd); - - if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd); - info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX); - -#ifdef LOW_ELF_STACK - info->start_stack = bprm->p = elf_stack - 4; -#endif - bprm->p = create_elf_tables(bprm->p, - bprm->argc, - bprm->envc, - &elf_ex, - load_addr, load_bias, - interp_load_addr, - (interpreter_type == INTERPRETER_AOUT ? 0 : 1), - info); - info->start_brk = info->brk = elf_brk; - info->end_code = end_code; - info->start_code = start_code; - info->start_data = end_code; - info->end_data = end_data; - info->start_stack = bprm->p; - - /* Calling set_brk effectively mmaps the pages that we need for the bss and break - sections */ - set_brk(elf_bss, elf_brk); - - padzero(elf_bss); - -#if 0 - printf("(start_brk) %x\n" , info->start_brk); - printf("(end_code) %x\n" , info->end_code); - printf("(start_code) %x\n" , info->start_code); - printf("(end_data) %x\n" , info->end_data); - printf("(start_stack) %x\n" , info->start_stack); - printf("(brk) %x\n" , info->brk); -#endif - - if ( info->personality == PER_SVR4 ) - { - /* Why this, you ask??? Well SVr4 maps page 0 as read-only, - and some applications "depend" upon this behavior. - Since we do not have the power to recompile these, we - emulate the SVr4 behavior. Sigh. */ - mapped_addr = target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC, - MAP_FIXED | MAP_PRIVATE, -1, 0); - } - - info->entry = elf_entry; - - return 0; -} - -static int load_aout_interp(void * exptr, int interp_fd) -{ - printf("a.out interpreter not yet supported\n"); - return(0); -} - -void do_init_thread(struct target_pt_regs *regs, struct image_info *infop) -{ - init_thread(regs, infop); -} |