sigutil_64.c

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#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/thread_info.h>
#include <linux/uaccess.h>
#include <linux/errno.h>

#include <asm/sigcontext.h>
#include <asm/fpumacro.h>
#include <asm/ptrace.h>
#include <asm/switch_to.h>

#include "sigutil.h"

int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
{
    unsigned long *fpregs = current_thread_info()->fpregs;
    unsigned long fprs;
    int err = 0;
    
    fprs = current_thread_info()->fpsaved[0];
    if (fprs & FPRS_DL)
        err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
                    (sizeof(unsigned int) * 32));
    if (fprs & FPRS_DU)
        err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
                    (sizeof(unsigned int) * 32));
    err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
    err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
    err |= __put_user(fprs, &fpu->si_fprs);

    return err;
}

int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
{
    unsigned long *fpregs = current_thread_info()->fpregs;
    unsigned long fprs;
    int err;

    err = __get_user(fprs, &fpu->si_fprs);
    fprs_write(0);
    regs->tstate &= ~TSTATE_PEF;
    if (fprs & FPRS_DL)
        err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
                       (sizeof(unsigned int) * 32));
    if (fprs & FPRS_DU)
        err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
                       (sizeof(unsigned int) * 32));
    err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
    err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
    current_thread_info()->fpsaved[0] |= fprs;
    return err;
}

int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
{
    int i, err = __put_user(wsaved, &rwin->wsaved);

    for (i = 0; i < wsaved; i++) {
        struct reg_window *rp = &current_thread_info()->reg_window[i];
        unsigned long fp = current_thread_info()->rwbuf_stkptrs[i];

        err |= copy_to_user(&rwin->reg_window[i], rp,
                    sizeof(struct reg_window));
        err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
    }
    return err;
}

int restore_rwin_state(__siginfo_rwin_t __user *rp)
{
    struct thread_info *t = current_thread_info();
    int i, wsaved, err;

    __get_user(wsaved, &rp->wsaved);
    if (wsaved > NSWINS)
        return -EFAULT;

    err = 0;
    for (i = 0; i < wsaved; i++) {
        err |= copy_from_user(&t->reg_window[i],
                      &rp->reg_window[i],
                      sizeof(struct reg_window));
        err |= __get_user(t->rwbuf_stkptrs[i],
                  &rp->rwbuf_stkptrs[i]);
    }
    if (err)
        return err;

    set_thread_wsaved(wsaved);
    synchronize_user_stack();
    if (get_thread_wsaved())
        return -EFAULT;
    return 0;
}