From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/x86_64/ia32/ia32_binfmt.c | 434 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 434 insertions(+) create mode 100644 arch/x86_64/ia32/ia32_binfmt.c (limited to 'arch/x86_64/ia32/ia32_binfmt.c') diff --git a/arch/x86_64/ia32/ia32_binfmt.c b/arch/x86_64/ia32/ia32_binfmt.c new file mode 100644 index 00000000000..93d568dfa76 --- /dev/null +++ b/arch/x86_64/ia32/ia32_binfmt.c @@ -0,0 +1,434 @@ +/* + * Written 2000,2002 by Andi Kleen. + * + * Loosely based on the sparc64 and IA64 32bit emulation loaders. + * This tricks binfmt_elf.c into loading 32bit binaries using lots + * of ugly preprocessor tricks. Talk about very very poor man's inheritance. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define ELF_NAME "elf/i386" + +#define AT_SYSINFO 32 +#define AT_SYSINFO_EHDR 33 + +int sysctl_vsyscall32 = 1; + +#define ARCH_DLINFO do { \ + if (sysctl_vsyscall32) { \ + NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \ + NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE); \ + } \ +} while(0) + +struct file; +struct elf_phdr; + +#define IA32_EMULATOR 1 + +#define ELF_ET_DYN_BASE (TASK_UNMAPPED_32 + 0x1000000) + +#undef ELF_ARCH +#define ELF_ARCH EM_386 + +#undef ELF_CLASS +#define ELF_CLASS ELFCLASS32 + +#define ELF_DATA ELFDATA2LSB + +#define USE_ELF_CORE_DUMP 1 + +/* Overwrite elfcore.h */ +#define _LINUX_ELFCORE_H 1 +typedef unsigned int elf_greg_t; + +#define ELF_NGREG (sizeof (struct user_regs_struct32) / sizeof(elf_greg_t)) +typedef elf_greg_t elf_gregset_t[ELF_NGREG]; + +/* + * These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out + * extra segments containing the vsyscall DSO contents. Dumping its + * contents makes post-mortem fully interpretable later without matching up + * the same kernel and hardware config to see what PC values meant. + * Dumping its extra ELF program headers includes all the other information + * a debugger needs to easily find how the vsyscall DSO was being used. + */ +#define ELF_CORE_EXTRA_PHDRS (VSYSCALL32_EHDR->e_phnum) +#define ELF_CORE_WRITE_EXTRA_PHDRS \ +do { \ + const struct elf32_phdr *const vsyscall_phdrs = \ + (const struct elf32_phdr *) (VSYSCALL32_BASE \ + + VSYSCALL32_EHDR->e_phoff); \ + int i; \ + Elf32_Off ofs = 0; \ + for (i = 0; i < VSYSCALL32_EHDR->e_phnum; ++i) { \ + struct elf32_phdr phdr = vsyscall_phdrs[i]; \ + if (phdr.p_type == PT_LOAD) { \ + BUG_ON(ofs != 0); \ + ofs = phdr.p_offset = offset; \ + phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz); \ + phdr.p_filesz = phdr.p_memsz; \ + offset += phdr.p_filesz; \ + } \ + else \ + phdr.p_offset += ofs; \ + phdr.p_paddr = 0; /* match other core phdrs */ \ + DUMP_WRITE(&phdr, sizeof(phdr)); \ + } \ +} while (0) +#define ELF_CORE_WRITE_EXTRA_DATA \ +do { \ + const struct elf32_phdr *const vsyscall_phdrs = \ + (const struct elf32_phdr *) (VSYSCALL32_BASE \ + + VSYSCALL32_EHDR->e_phoff); \ + int i; \ + for (i = 0; i < VSYSCALL32_EHDR->e_phnum; ++i) { \ + if (vsyscall_phdrs[i].p_type == PT_LOAD) \ + DUMP_WRITE((void *) (u64) vsyscall_phdrs[i].p_vaddr, \ + PAGE_ALIGN(vsyscall_phdrs[i].p_memsz)); \ + } \ +} while (0) + +struct elf_siginfo +{ + int si_signo; /* signal number */ + int si_code; /* extra code */ + int si_errno; /* errno */ +}; + +#define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0) + +struct elf_prstatus +{ + struct elf_siginfo pr_info; /* Info associated with signal */ + short pr_cursig; /* Current signal */ + unsigned int pr_sigpend; /* Set of pending signals */ + unsigned int pr_sighold; /* Set of held signals */ + pid_t pr_pid; + pid_t pr_ppid; + pid_t pr_pgrp; + pid_t pr_sid; + struct compat_timeval pr_utime; /* User time */ + struct compat_timeval pr_stime; /* System time */ + struct compat_timeval pr_cutime; /* Cumulative user time */ + struct compat_timeval pr_cstime; /* Cumulative system time */ + elf_gregset_t pr_reg; /* GP registers */ + int pr_fpvalid; /* True if math co-processor being used. */ +}; + +#define ELF_PRARGSZ (80) /* Number of chars for args */ + +struct elf_prpsinfo +{ + char pr_state; /* numeric process state */ + char pr_sname; /* char for pr_state */ + char pr_zomb; /* zombie */ + char pr_nice; /* nice val */ + unsigned int pr_flag; /* flags */ + __u16 pr_uid; + __u16 pr_gid; + pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid; + /* Lots missing */ + char pr_fname[16]; /* filename of executable */ + char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */ +}; + +#define __STR(x) #x +#define STR(x) __STR(x) + +#define _GET_SEG(x) \ + ({ __u32 seg; asm("movl %%" STR(x) ",%0" : "=r"(seg)); seg; }) + +/* Assumes current==process to be dumped */ +#define ELF_CORE_COPY_REGS(pr_reg, regs) \ + pr_reg[0] = regs->rbx; \ + pr_reg[1] = regs->rcx; \ + pr_reg[2] = regs->rdx; \ + pr_reg[3] = regs->rsi; \ + pr_reg[4] = regs->rdi; \ + pr_reg[5] = regs->rbp; \ + pr_reg[6] = regs->rax; \ + pr_reg[7] = _GET_SEG(ds); \ + pr_reg[8] = _GET_SEG(es); \ + pr_reg[9] = _GET_SEG(fs); \ + pr_reg[10] = _GET_SEG(gs); \ + pr_reg[11] = regs->orig_rax; \ + pr_reg[12] = regs->rip; \ + pr_reg[13] = regs->cs; \ + pr_reg[14] = regs->eflags; \ + pr_reg[15] = regs->rsp; \ + pr_reg[16] = regs->ss; + +#define user user32 + +#define __ASM_X86_64_ELF_H 1 +#define elf_read_implies_exec(ex, have_pt_gnu_stack) (!(have_pt_gnu_stack)) +//#include +#include + +typedef struct user_i387_ia32_struct elf_fpregset_t; +typedef struct user32_fxsr_struct elf_fpxregset_t; + + +static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *regs) +{ + ELF_CORE_COPY_REGS((*elfregs), regs) +} + +static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs) +{ + struct pt_regs *pp = (struct pt_regs *)(t->thread.rsp0); + --pp; + ELF_CORE_COPY_REGS((*elfregs), pp); + /* fix wrong segments */ + (*elfregs)[7] = t->thread.ds; + (*elfregs)[9] = t->thread.fsindex; + (*elfregs)[10] = t->thread.gsindex; + (*elfregs)[8] = t->thread.es; + return 1; +} + +static inline int +elf_core_copy_task_fpregs(struct task_struct *tsk, struct pt_regs *regs, elf_fpregset_t *fpu) +{ + struct _fpstate_ia32 *fpstate = (void*)fpu; + mm_segment_t oldfs = get_fs(); + + if (!tsk_used_math(tsk)) + return 0; + if (!regs) + regs = (struct pt_regs *)tsk->thread.rsp0; + --regs; + if (tsk == current) + unlazy_fpu(tsk); + set_fs(KERNEL_DS); + save_i387_ia32(tsk, fpstate, regs, 1); + /* Correct for i386 bug. It puts the fop into the upper 16bits of + the tag word (like FXSAVE), not into the fcs*/ + fpstate->cssel |= fpstate->tag & 0xffff0000; + set_fs(oldfs); + return 1; +} + +#define ELF_CORE_COPY_XFPREGS 1 +static inline int +elf_core_copy_task_xfpregs(struct task_struct *t, elf_fpxregset_t *xfpu) +{ + struct pt_regs *regs = ((struct pt_regs *)(t->thread.rsp0))-1; + if (!tsk_used_math(t)) + return 0; + if (t == current) + unlazy_fpu(t); + memcpy(xfpu, &t->thread.i387.fxsave, sizeof(elf_fpxregset_t)); + xfpu->fcs = regs->cs; + xfpu->fos = t->thread.ds; /* right? */ + return 1; +} + +#undef elf_check_arch +#define elf_check_arch(x) \ + ((x)->e_machine == EM_386) + +extern int force_personality32; + +#define ELF_EXEC_PAGESIZE PAGE_SIZE +#define ELF_HWCAP (boot_cpu_data.x86_capability[0]) +#define ELF_PLATFORM ("i686") +#define SET_PERSONALITY(ex, ibcs2) \ +do { \ + unsigned long new_flags = 0; \ + if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \ + new_flags = _TIF_IA32; \ + if ((current_thread_info()->flags & _TIF_IA32) \ + != new_flags) \ + set_thread_flag(TIF_ABI_PENDING); \ + else \ + clear_thread_flag(TIF_ABI_PENDING); \ + /* XXX This overwrites the user set personality */ \ + current->personality |= force_personality32; \ +} while (0) + +/* Override some function names */ +#define elf_format elf32_format + +#define init_elf_binfmt init_elf32_binfmt +#define exit_elf_binfmt exit_elf32_binfmt + +#define load_elf_binary load_elf32_binary + +#define ELF_PLAT_INIT(r, load_addr) elf32_init(r) +#define setup_arg_pages(bprm, stack_top, exec_stack) \ + ia32_setup_arg_pages(bprm, stack_top, exec_stack) +int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack); + +#undef start_thread +#define start_thread(regs,new_rip,new_rsp) do { \ + asm volatile("movl %0,%%fs" :: "r" (0)); \ + asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS)); \ + load_gs_index(0); \ + (regs)->rip = (new_rip); \ + (regs)->rsp = (new_rsp); \ + (regs)->eflags = 0x200; \ + (regs)->cs = __USER32_CS; \ + (regs)->ss = __USER32_DS; \ + set_fs(USER_DS); \ +} while(0) + + +#define elf_map elf32_map + +#include + +MODULE_DESCRIPTION("Binary format loader for compatibility with IA32 ELF binaries."); +MODULE_AUTHOR("Eric Youngdale, Andi Kleen"); + +#undef MODULE_DESCRIPTION +#undef MODULE_AUTHOR + +#define elf_addr_t __u32 + +#undef TASK_SIZE +#define TASK_SIZE 0xffffffff + +static void elf32_init(struct pt_regs *); + +#include "../../../fs/binfmt_elf.c" + +static void elf32_init(struct pt_regs *regs) +{ + struct task_struct *me = current; + regs->rdi = 0; + regs->rsi = 0; + regs->rdx = 0; + regs->rcx = 0; + regs->rax = 0; + regs->rbx = 0; + regs->rbp = 0; + regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 = + regs->r13 = regs->r14 = regs->r15 = 0; + me->thread.fs = 0; + me->thread.gs = 0; + me->thread.fsindex = 0; + me->thread.gsindex = 0; + me->thread.ds = __USER_DS; + me->thread.es = __USER_DS; +} + +int setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack) +{ + unsigned long stack_base; + struct vm_area_struct *mpnt; + struct mm_struct *mm = current->mm; + int i, ret; + + stack_base = IA32_STACK_TOP - MAX_ARG_PAGES * PAGE_SIZE; + mm->arg_start = bprm->p + stack_base; + + bprm->p += stack_base; + if (bprm->loader) + bprm->loader += stack_base; + bprm->exec += stack_base; + + mpnt = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL); + if (!mpnt) + return -ENOMEM; + + if (security_vm_enough_memory((IA32_STACK_TOP - (PAGE_MASK & (unsigned long) bprm->p))>>PAGE_SHIFT)) { + kmem_cache_free(vm_area_cachep, mpnt); + return -ENOMEM; + } + + memset(mpnt, 0, sizeof(*mpnt)); + + down_write(&mm->mmap_sem); + { + mpnt->vm_mm = mm; + mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p; + mpnt->vm_end = IA32_STACK_TOP; + if (executable_stack == EXSTACK_ENABLE_X) + mpnt->vm_flags = VM_STACK_FLAGS | VM_EXEC; + else if (executable_stack == EXSTACK_DISABLE_X) + mpnt->vm_flags = VM_STACK_FLAGS & ~VM_EXEC; + else + mpnt->vm_flags = VM_STACK_FLAGS; + mpnt->vm_page_prot = (mpnt->vm_flags & VM_EXEC) ? + PAGE_COPY_EXEC : PAGE_COPY; + if ((ret = insert_vm_struct(mm, mpnt))) { + up_write(&mm->mmap_sem); + kmem_cache_free(vm_area_cachep, mpnt); + return ret; + } + mm->stack_vm = mm->total_vm = vma_pages(mpnt); + } + + for (i = 0 ; i < MAX_ARG_PAGES ; i++) { + struct page *page = bprm->page[i]; + if (page) { + bprm->page[i] = NULL; + install_arg_page(mpnt, page, stack_base); + } + stack_base += PAGE_SIZE; + } + up_write(&mm->mmap_sem); + + return 0; +} + +static unsigned long +elf32_map (struct file *filep, unsigned long addr, struct elf_phdr *eppnt, int prot, int type) +{ + unsigned long map_addr; + struct task_struct *me = current; + + down_write(&me->mm->mmap_sem); + map_addr = do_mmap(filep, ELF_PAGESTART(addr), + eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr), prot, + type, + eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr)); + up_write(&me->mm->mmap_sem); + return(map_addr); +} + +#ifdef CONFIG_SYSCTL +/* Register vsyscall32 into the ABI table */ +#include + +static ctl_table abi_table2[] = { + { 99, "vsyscall32", &sysctl_vsyscall32, sizeof(int), 0644, NULL, + proc_dointvec }, + { 0, } +}; + +static ctl_table abi_root_table2[] = { + { .ctl_name = CTL_ABI, .procname = "abi", .mode = 0555, + .child = abi_table2 }, + { 0 }, +}; + +static __init int ia32_binfmt_init(void) +{ + register_sysctl_table(abi_root_table2, 1); + return 0; +} +__initcall(ia32_binfmt_init); +#endif -- cgit v1.2.3