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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 <stdlib.h>
#include <sys/ptrace.h>
#ifdef __i386__
#include <sys/user.h>
#endif
#include <longjmp.h>
#include <sysdep/ptrace_user.h>
#include <sys/uio.h>
#include <asm/sigcontext.h>
#include <linux/elf.h>
#include <registers.h>
#include <sys/mman.h>
static unsigned long ptrace_regset;
unsigned long host_fp_size;
int get_fp_registers(int pid, unsigned long *regs)
{
struct iovec iov = {
.iov_base = regs,
.iov_len = host_fp_size,
};
if (ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov) < 0)
return -errno;
return 0;
}
int put_fp_registers(int pid, unsigned long *regs)
{
struct iovec iov = {
.iov_base = regs,
.iov_len = host_fp_size,
};
if (ptrace(PTRACE_SETREGSET, pid, ptrace_regset, &iov) < 0)
return -errno;
return 0;
}
int arch_init_registers(int pid)
{
struct iovec iov = {
/* Just use plenty of space, it does not cost us anything */
.iov_len = 2 * 1024 * 1024,
};
int ret;
iov.iov_base = mmap(NULL, iov.iov_len, PROT_WRITE | PROT_READ,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (iov.iov_base == MAP_FAILED)
return -ENOMEM;
/* GDB has x86_xsave_length, which uses x86_cpuid_count */
ptrace_regset = NT_X86_XSTATE;
ret = ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov);
if (ret)
ret = -errno;
if (ret == -ENODEV) {
#ifdef CONFIG_X86_32
ptrace_regset = NT_PRXFPREG;
#else
ptrace_regset = NT_PRFPREG;
#endif
iov.iov_len = 2 * 1024 * 1024;
ret = ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov);
if (ret)
ret = -errno;
}
munmap(iov.iov_base, 2 * 1024 * 1024);
host_fp_size = iov.iov_len;
return ret;
}
unsigned long get_thread_reg(int reg, jmp_buf *buf)
{
switch (reg) {
#ifdef __i386__
case HOST_IP:
return buf[0]->__eip;
case HOST_SP:
return buf[0]->__esp;
case HOST_BP:
return buf[0]->__ebp;
#else
case HOST_IP:
return buf[0]->__rip;
case HOST_SP:
return buf[0]->__rsp;
case HOST_BP:
return buf[0]->__rbp;
#endif
default:
printk(UM_KERN_ERR "get_thread_regs - unknown register %d\n",
reg);
return 0;
}
}
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