Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 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 <linux/types.h>

#include <linux/stddef.h>

#include <linux/rwsem.h>

#include <linux/sched.h>

#include <linux/compat.h>

#include <linux/string.h>

#include <linux/binfmts.h>

#include <linux/mm.h>

#include <linux/security.h>

#include <linux/elfcore-compat.h>

#include <asm/segment.h> 

#include <asm/ptrace.h>

#include <asm/processor.h>

#include <asm/user32.h>

#include <asm/sigcontext32.h>

#include <asm/fpu32.h>

#include <asm/i387.h>

#include <asm/uaccess.h>

#include <asm/ia32.h>

#include <asm/vsyscall32.h>

#undef  ELF_ARCH

#undef  ELF_CLASS

#define ELF_CLASS       ELFCLASS32

#define ELF_ARCH        EM_386

#undef  elfhdr

#undef  elf_phdr

#undef  elf_note

#undef  elf_addr_t

#define elfhdr          elf32_hdr

#define elf_phdr        elf32_phdr

#define elf_note        elf32_note

#define elf_addr_t      Elf32_Off

#define ELF_NAME "elf/i386"

#define AT_SYSINFO 32

#define AT_SYSINFO_EHDR         33

int sysctl_vsyscall32 = 1;

#undef ARCH_DLINFO

#define ARCH_DLINFO do {  \

        if (sysctl_vsyscall32) { \

                current->mm->context.vdso = (void *)VSYSCALL32_BASE;    \

                NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \

                NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE);    \

        }       \

} while(0)

struct file;

#define IA32_EMULATOR 1

#undef ELF_ET_DYN_BASE

#define ELF_ET_DYN_BASE         (TASK_UNMAPPED_BASE + 0x1000000)

#define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0)

#define _GET_SEG(x) \

        ({ __u32 seg; asm("movl %%" __stringify(x) ",%0" : "=r"(seg)); seg; })

/* Assumes current==process to be dumped */

#undef  ELF_CORE_COPY_REGS

#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 elf_prstatus    compat_elf_prstatus

#define elf_prpsinfo    compat_elf_prpsinfo

#define elf_fpregset_t  struct user_i387_ia32_struct

#define elf_fpxregset_t struct user32_fxsr_struct

#define user            user32

#undef elf_read_implies_exec

#define elf_read_implies_exec(ex, executable_stack)     (executable_stack != EXSTACK_DISABLE_X)

#define elf_core_copy_regs              elf32_core_copy_regs

static inline void elf32_core_copy_regs(compat_elf_gregset_t *elfregs,

                                        struct pt_regs *regs)

{

        ELF_CORE_COPY_REGS((&elfregs->ebx), regs)

}

#define elf_core_copy_task_regs         elf32_core_copy_task_regs

static inline int elf32_core_copy_task_regs(struct task_struct *t,

                                            compat_elf_gregset_t* elfregs)

{

        struct pt_regs *pp = task_pt_regs(t);

        ELF_CORE_COPY_REGS((&elfregs->ebx), pp);

        /* fix wrong segments */

        elfregs->ds = t->thread.ds;

        elfregs->fs = t->thread.fsindex;

        elfregs->gs = t->thread.gsindex;

        elfregs->es = t->thread.es;

        return 1;

}

#define elf_core_copy_task_fpregs       elf32_core_copy_task_fpregs

static inline int

elf32_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 = task_pt_regs(tsk);

        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

#define ELF_CORE_XFPREG_TYPE NT_PRXFPREG

#define elf_core_copy_task_xfpregs      elf32_core_copy_task_xfpregs

static inline int

elf32_core_copy_task_xfpregs(struct task_struct *t, elf_fpxregset_t *xfpu)

{

        struct pt_regs *regs = task_pt_regs(t);

        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;

#undef  ELF_EXEC_PAGESIZE

#undef  ELF_HWCAP

#undef  ELF_PLATFORM

#undef  SET_PERSONALITY

#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

#undef  ELF_PLAT_INIT

#define ELF_PLAT_INIT(r, load_addr)     elf32_init(r)

#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)

#include <linux/module.h>

MODULE_DESCRIPTION("Binary format loader for compatibility with IA32 ELF binaries.");

MODULE_AUTHOR("Eric Youngdale, Andi Kleen");

#undef MODULE_DESCRIPTION

#undef MODULE_AUTHOR

static void elf32_init(struct pt_regs *);

#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1

#define arch_setup_additional_pages syscall32_setup_pages

extern int syscall32_setup_pages(struct linux_binprm *, int exstack);

#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;

}

#ifdef CONFIG_SYSCTL

/* Register vsyscall32 into the ABI table */

#include <linux/sysctl.h>

static ctl_table abi_table2[] = {

        {

                .procname       = "vsyscall32",

                .data           = &sysctl_vsyscall32,

                .maxlen         = sizeof(int),

                .mode           = 0644,

                .proc_handler   = proc_dointvec

        },

        {}

};

static ctl_table abi_root_table2[] = {

        {

                .ctl_name = CTL_ABI,

                .procname = "abi",

                .mode = 0555,

                .child = abi_table2

        },

        {}

};

static __init int ia32_binfmt_init(void)

{

        register_sysctl_table(abi_root_table2);

        return 0;

}

__initcall(ia32_binfmt_init);

#endif