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/*
* 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);
force_sig(SIGKILL, tsk);
return 0;
}
pte = pte_alloc(pmd, address);
if (!pte) {
__free_page(page);
force_sig(SIGKILL, 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 */
current->thread.map_base = 0x40000000;
/* 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;
/*
* 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 */
}
#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;
}
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