/* * IA-32 ELF support. * * Copyright (C) 1999 Arun Sharma * Copyright (C) 2001 Hewlett-Packard Co * David Mosberger-Tang * * 06/16/00 A. Mallick initialize csd/ssd/tssd/cflg for ia32_load_state * 04/13/01 D. Mosberger dropped saving tssd in ar.k1---it's not needed * 09/14/01 D. Mosberger fixed memory management for gdt/tss page */ #include #include #include #include #include #define CONFIG_BINFMT_ELF32 /* Override some function names */ #undef start_thread #define start_thread ia32_start_thread #define elf_format elf32_format #define init_elf_binfmt init_elf32_binfmt #define exit_elf_binfmt exit_elf32_binfmt #undef CONFIG_BINFMT_ELF #ifdef CONFIG_BINFMT_ELF32 # define CONFIG_BINFMT_ELF CONFIG_BINFMT_ELF32 #endif #undef CONFIG_BINFMT_ELF_MODULE #ifdef CONFIG_BINFMT_ELF32_MODULE # define CONFIG_BINFMT_ELF_MODULE CONFIG_BINFMT_ELF32_MODULE #endif #undef CLOCKS_PER_SEC #define CLOCKS_PER_SEC IA32_CLOCKS_PER_SEC extern void ia64_elf32_init (struct pt_regs *regs); extern void put_dirty_page (struct task_struct * tsk, struct page *page, unsigned long address); static void elf32_set_personality (void); #define ELF_PLAT_INIT(_r) ia64_elf32_init(_r) #define setup_arg_pages(bprm) ia32_setup_arg_pages(bprm) #define elf_map elf32_map #define SET_PERSONALITY(ex, ibcs2) elf32_set_personality() /* Ugly but avoids duplication */ #include "../../../fs/binfmt_elf.c" extern struct page *ia32_shared_page[]; extern unsigned long *ia32_gdt; struct page * ia32_install_shared_page (struct vm_area_struct *vma, unsigned long address, int no_share) { struct page *pg = ia32_shared_page[(address - vma->vm_start)/PAGE_SIZE]; get_page(pg); return pg; } static struct vm_operations_struct ia32_shared_page_vm_ops = { nopage: ia32_install_shared_page }; void ia64_elf32_init (struct pt_regs *regs) { struct vm_area_struct *vma; /* * Map GDT and TSS below 4GB, where the processor can find them. We need to map * it with privilege level 3 because the IVE uses non-privileged accesses to these * tables. IA-32 segmentation is used to protect against IA-32 accesses to them. */ vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL); if (vma) { vma->vm_mm = current->mm; vma->vm_start = IA32_GDT_OFFSET; vma->vm_end = vma->vm_start + max(PAGE_SIZE, 2*IA32_PAGE_SIZE); vma->vm_page_prot = PAGE_SHARED; vma->vm_flags = VM_READ|VM_MAYREAD; vma->vm_ops = &ia32_shared_page_vm_ops; vma->vm_pgoff = 0; vma->vm_file = NULL; vma->vm_private_data = NULL; down_write(¤t->mm->mmap_sem); { insert_vm_struct(current->mm, vma); } up_write(¤t->mm->mmap_sem); } /* * Install LDT as anonymous memory. This gives us all-zero segment descriptors * until a task modifies them via modify_ldt(). */ vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL); if (vma) { vma->vm_mm = current->mm; vma->vm_start = IA32_LDT_OFFSET; vma->vm_end = vma->vm_start + PAGE_ALIGN(IA32_LDT_ENTRIES*IA32_LDT_ENTRY_SIZE); vma->vm_page_prot = PAGE_SHARED; vma->vm_flags = VM_READ|VM_WRITE|VM_MAYREAD|VM_MAYWRITE; vma->vm_ops = NULL; vma->vm_pgoff = 0; vma->vm_file = NULL; vma->vm_private_data = NULL; down_write(¤t->mm->mmap_sem); { insert_vm_struct(current->mm, vma); } up_write(¤t->mm->mmap_sem); } ia64_psr(regs)->ac = 0; /* turn off alignment checking */ regs->loadrs = 0; /* * According to the ABI %edx points to an `atexit' handler. Since we don't have * one we'll set it to 0 and initialize all the other registers just to make * things more deterministic, ala the i386 implementation. */ regs->r8 = 0; /* %eax */ regs->r11 = 0; /* %ebx */ regs->r9 = 0; /* %ecx */ regs->r10 = 0; /* %edx */ regs->r13 = 0; /* %ebp */ regs->r14 = 0; /* %esi */ regs->r15 = 0; /* %edi */ current->thread.eflag = IA32_EFLAG; current->thread.fsr = IA32_FSR_DEFAULT; current->thread.fcr = IA32_FCR_DEFAULT; current->thread.fir = 0; current->thread.fdr = 0; /* * Setup GDTD. Note: GDTD is the descrambled version of the pseudo-descriptor * format defined by Figure 3-11 "Pseudo-Descriptor Format" in the IA-32 * architecture manual. */ regs->r31 = IA32_SEG_UNSCRAMBLE(IA32_SEG_DESCRIPTOR(IA32_GDT_OFFSET, IA32_PAGE_SIZE - 1, 0, 0, 0, 0, 0, 0, 0)); /* Setup the segment selectors */ regs->r16 = (__USER_DS << 16) | __USER_DS; /* ES == DS, GS, FS are zero */ regs->r17 = (__USER_DS << 16) | __USER_CS; /* SS, CS; ia32_load_state() sets TSS and LDT */ ia32_load_segment_descriptors(current); ia32_load_state(current); } int ia32_setup_arg_pages (struct linux_binprm *bprm) { unsigned long stack_base; struct vm_area_struct *mpnt; int i; stack_base = IA32_STACK_TOP - MAX_ARG_PAGES*PAGE_SIZE; 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; down_write(¤t->mm->mmap_sem); { mpnt->vm_mm = current->mm; mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p; mpnt->vm_end = IA32_STACK_TOP; mpnt->vm_page_prot = PAGE_COPY; mpnt->vm_flags = VM_STACK_FLAGS; mpnt->vm_ops = NULL; mpnt->vm_pgoff = 0; mpnt->vm_file = NULL; mpnt->vm_private_data = 0; insert_vm_struct(current->mm, mpnt); current->mm->total_vm = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT; } for (i = 0 ; i < MAX_ARG_PAGES ; i++) { struct page *page = bprm->page[i]; if (page) { bprm->page[i] = NULL; put_dirty_page(current, page, stack_base); } stack_base += PAGE_SIZE; } up_write(¤t->mm->mmap_sem); return 0; } static void elf32_set_personality (void) { set_personality(PER_LINUX32); current->thread.map_base = IA32_PAGE_OFFSET/3; current->thread.task_size = IA32_PAGE_OFFSET; /* use what Linux/x86 uses... */ set_fs(USER_DS); /* set addr limit for new TASK_SIZE */ } static unsigned long elf32_map (struct file *filep, unsigned long addr, struct elf_phdr *eppnt, int prot, int type) { unsigned long pgoff = (eppnt->p_vaddr) & ~IA32_PAGE_MASK; return ia32_do_mmap(filep, (addr & IA32_PAGE_MASK), eppnt->p_filesz + pgoff, prot, type, eppnt->p_offset - pgoff); }