110 lines
2.1 KiB
C
110 lines
2.1 KiB
C
/*
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* Copyright (C) 2004 PathScale, Inc
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* Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/ptrace.h>
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#ifdef __i386__
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#include <sys/user.h>
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#endif
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#include <longjmp.h>
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#include <sysdep/ptrace_user.h>
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#include <sys/uio.h>
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#include <asm/sigcontext.h>
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#include <linux/elf.h>
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#include <registers.h>
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#include <sys/mman.h>
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static unsigned long ptrace_regset;
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unsigned long host_fp_size;
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int get_fp_registers(int pid, unsigned long *regs)
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{
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struct iovec iov = {
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.iov_base = regs,
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.iov_len = host_fp_size,
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};
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if (ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov) < 0)
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return -errno;
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return 0;
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}
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int put_fp_registers(int pid, unsigned long *regs)
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{
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struct iovec iov = {
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.iov_base = regs,
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.iov_len = host_fp_size,
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};
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if (ptrace(PTRACE_SETREGSET, pid, ptrace_regset, &iov) < 0)
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return -errno;
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return 0;
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}
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int arch_init_registers(int pid)
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{
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struct iovec iov = {
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/* Just use plenty of space, it does not cost us anything */
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.iov_len = 2 * 1024 * 1024,
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};
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int ret;
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iov.iov_base = mmap(NULL, iov.iov_len, PROT_WRITE | PROT_READ,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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if (iov.iov_base == MAP_FAILED)
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return -ENOMEM;
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/* GDB has x86_xsave_length, which uses x86_cpuid_count */
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ptrace_regset = NT_X86_XSTATE;
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ret = ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov);
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if (ret)
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ret = -errno;
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if (ret == -ENODEV) {
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#ifdef CONFIG_X86_32
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ptrace_regset = NT_PRXFPREG;
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#else
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ptrace_regset = NT_PRFPREG;
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#endif
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iov.iov_len = 2 * 1024 * 1024;
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ret = ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov);
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if (ret)
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ret = -errno;
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}
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munmap(iov.iov_base, 2 * 1024 * 1024);
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host_fp_size = iov.iov_len;
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return ret;
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}
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unsigned long get_thread_reg(int reg, jmp_buf *buf)
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{
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switch (reg) {
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#ifdef __i386__
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case HOST_IP:
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return buf[0]->__eip;
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case HOST_SP:
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return buf[0]->__esp;
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case HOST_BP:
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return buf[0]->__ebp;
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#else
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case HOST_IP:
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return buf[0]->__rip;
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case HOST_SP:
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return buf[0]->__rsp;
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case HOST_BP:
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return buf[0]->__rbp;
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#endif
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default:
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printk(UM_KERN_ERR "get_thread_regs - unknown register %d\n",
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reg);
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return 0;
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}
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}
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