registers.c

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/*
 * Copyright (C) 2004 PathScale, Inc
 * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <errno.h>
#include <string.h>
#include <sys/ptrace.h>
#include <sysdep/ptrace.h>
#include <sysdep/ptrace_user.h>
#include <registers.h>

int save_registers(int pid, struct uml_pt_regs *regs)
{
    int err;

    err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);
    if (err < 0)
        return -errno;
    return 0;
}

int restore_registers(int pid, struct uml_pt_regs *regs)
{
    int err;

    err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);
    if (err < 0)
        return -errno;
    return 0;
}

/* This is set once at boot time and not changed thereafter */

static unsigned long exec_regs[MAX_REG_NR];
static unsigned long exec_fp_regs[FP_SIZE];

int init_registers(int pid)
{
    int err;

    err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
    if (err < 0)
        return -errno;

    arch_init_registers(pid);
    get_fp_registers(pid, exec_fp_regs);
    return 0;
}

void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
{
    memcpy(regs, exec_regs, sizeof(exec_regs));

    if (fp_regs)
        memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs));
}