patch-2.3.43 linux/arch/ia64/ia32/binfmt_elf32.c

• Lines: 181
• Date: Tue Feb 8 12:01:59 2000
• Orig file: v2.3.42/linux/arch/ia64/ia32/binfmt_elf32.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/arch/ia64/ia32/binfmt_elf32.c linux/arch/ia64/ia32/binfmt_elf32.c
@@ -0,0 +1,180 @@
+/*
+ * IA-32 ELF support.
+ *
+ * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
+ */
+#include <linux/config.h>
+#include <linux/posix_types.h>
+
+#include <asm/signal.h>
+#include <asm/ia32.h>
+
+#define CONFIG_BINFMT_ELF32
+
+/* Override some function names */
+#undef start_thread
+#define start_thread			ia32_start_thread
+#define init_elf_binfmt			init_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
+
+void ia64_elf32_init(struct pt_regs *regs);
+#define ELF_PLAT_INIT(_r)		ia64_elf32_init(_r)
+
+#define setup_arg_pages(bprm)		ia32_setup_arg_pages(bprm)
+
+/* Ugly but avoids duplication */
+#include "../../../fs/binfmt_elf.c"
+
+/* Global descriptor table */
+unsigned long *ia32_gdt_table, *ia32_tss;
+
+struct page *
+put_shared_page(struct task_struct * tsk, struct page *page, unsigned long address)
+{
+	pgd_t * pgd;
+	pmd_t * pmd;
+	pte_t * pte;
+
+	if (page_count(page) != 1)
+		printk("mem_map disagrees with %p at %08lx\n", page, address);
+	pgd = pgd_offset(tsk->mm, address);
+	pmd = pmd_alloc(pgd, address);
+	if (!pmd) {
+		__free_page(page);
+		oom(tsk);
+		return 0;
+	}
+	pte = pte_alloc(pmd, address);
+	if (!pte) {
+		__free_page(page);
+		oom(tsk);
+		return 0;
+	}
+	if (!pte_none(*pte)) {
+		pte_ERROR(*pte);
+		__free_page(page);
+		return 0;
+	}
+	flush_page_to_ram(page);
+	set_pte(pte, pte_mkwrite(mk_pte(page, PAGE_SHARED)));
+	/* no need for flush_tlb */
+	return page;
+}
+
+void ia64_elf32_init(struct pt_regs *regs)
+{
+	int nr;
+
+	put_shared_page(current, mem_map + MAP_NR(ia32_gdt_table), IA32_PAGE_OFFSET);
+	if (PAGE_SHIFT <= IA32_PAGE_SHIFT)
+		put_shared_page(current, mem_map + MAP_NR(ia32_tss), IA32_PAGE_OFFSET + PAGE_SIZE);
+
+	nr = smp_processor_id();
+	
+	/* Do all the IA-32 setup here */
+
+	/* CS descriptor */
+	__asm__("mov ar.csd = %0" : /* no outputs */
+		: "r" IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0xBL, 1L,
+					  3L, 1L, 1L, 1L));
+	/* SS descriptor */
+	__asm__("mov ar.ssd = %0" : /* no outputs */
+		: "r" IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0x3L, 1L,
+					  3L, 1L, 1L, 1L));
+	/* EFLAGS */
+	__asm__("mov ar.eflag = %0" : /* no outputs */ : "r" (IA32_EFLAG));
+
+	/* Control registers */
+	__asm__("mov ar.cflg = %0"
+		: /* no outputs */
+		: "r" (((ulong) IA32_CR4 << 32) | IA32_CR0));
+	__asm__("mov ar.fsr = %0"
+		: /* no outputs */
+		: "r" ((ulong)IA32_FSR_DEFAULT));
+	__asm__("mov ar.fcr = %0"
+		: /* no outputs */
+		: "r" ((ulong)IA32_FCR_DEFAULT));
+	__asm__("mov ar.fir = r0");
+	__asm__("mov ar.fdr = r0");
+	/* TSS */
+	__asm__("mov ar.k1 = %0"
+		: /* no outputs */
+		: "r" IA64_SEG_DESCRIPTOR(IA32_PAGE_OFFSET + PAGE_SIZE,
+					  0x1FFFL, 0xBL, 1L,
+					  3L, 1L, 1L, 1L));
+
+	/* Get the segment selectors right */
+	regs->r16 = (__USER_DS << 16) |  (__USER_DS); /* ES == DS, GS, FS are zero */
+	regs->r17 = (_TSS(nr) << 48) | (_LDT(nr) << 32)
+		    | (__USER_DS << 16) | __USER_CS;
+
+	/* Setup other segment descriptors - ESD, DSD, FSD, GSD */
+	regs->r24 = IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0x3L, 1L, 3L, 1L, 1L, 1L);
+	regs->r27 = IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0x3L, 1L, 3L, 1L, 1L, 1L);
+	regs->r28 = IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0x3L, 1L, 3L, 1L, 1L, 1L);
+	regs->r29 = IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0x3L, 1L, 3L, 1L, 1L, 1L);
+
+	/* Setup the LDT and GDT */
+	regs->r30 = ia32_gdt_table[_LDT(nr)];
+	regs->r31 = IA64_SEG_DESCRIPTOR(0xc0000000L, 0x400L, 0x3L, 1L, 3L,
+					1L, 1L, 1L);
+
+       	/* Clear psr.ac */
+	regs->cr_ipsr &= ~IA64_PSR_AC;
+
+	regs->loadrs = 0;
+}
+
+#undef STACK_TOP
+#define STACK_TOP ((IA32_PAGE_OFFSET/3) * 2)
+
+int ia32_setup_arg_pages(struct linux_binprm *bprm)
+{
+	unsigned long stack_base;
+	struct vm_area_struct *mpnt;
+	int i;
+
+	stack_base = 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; 
+	
+	{
+		mpnt->vm_mm = current->mm;
+		mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p;
+		mpnt->vm_end = 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++) {
+		if (bprm->page[i]) {
+			current->mm->rss++;
+			put_dirty_page(current,bprm->page[i],stack_base);
+		}
+		stack_base += PAGE_SIZE;
+	}
+	
+	return 0;
+}