131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/*
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* This file is part of ltrace.
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* Copyright (C) 2014 Petr Machata, Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <sys/ptrace.h>
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#include <asm/ptrace.h>
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#include <linux/uio.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "backend.h"
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#include "proc.h"
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#define PC_OFF (32 * 4)
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int
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aarch64_read_gregs(struct process *proc, struct user_pt_regs *regs)
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{
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*regs = (struct user_pt_regs) {};
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struct iovec iovec;
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iovec.iov_base = regs;
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iovec.iov_len = sizeof *regs;
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return ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS, &iovec) < 0
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? -1 : 0;
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}
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int
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aarch64_write_gregs(struct process *proc, struct user_pt_regs *regs)
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{
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struct iovec iovec;
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iovec.iov_base = regs;
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iovec.iov_len = sizeof *regs;
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return ptrace(PTRACE_SETREGSET, proc->pid, NT_PRSTATUS, &iovec) < 0
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? -1 : 0;
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}
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int
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aarch64_read_fregs(struct process *proc, struct user_fpsimd_state *regs)
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{
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*regs = (struct user_fpsimd_state) {};
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struct iovec iovec;
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iovec.iov_base = regs;
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iovec.iov_len = sizeof *regs;
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return ptrace(PTRACE_GETREGSET, proc->pid, NT_FPREGSET, &iovec) < 0
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? -1 : 0;
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}
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arch_addr_t
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get_instruction_pointer(struct process *proc)
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{
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struct user_pt_regs regs;
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if (aarch64_read_gregs(proc, ®s) < 0) {
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fprintf(stderr, "get_instruction_pointer: "
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"Couldn't read registers of %d.\n", proc->pid);
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return 0;
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}
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/*
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char buf[128];
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sprintf(buf, "cat /proc/%d/maps", proc->pid);
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system(buf);
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*/
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/* XXX double cast */
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return (arch_addr_t) (uintptr_t) regs.pc;
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}
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void
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set_instruction_pointer(struct process *proc, arch_addr_t addr)
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{
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struct user_pt_regs regs;
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if (aarch64_read_gregs(proc, ®s) < 0) {
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fprintf(stderr, "get_instruction_pointer: "
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"Couldn't read registers of %d.\n", proc->pid);
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return;
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}
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/* XXX double cast */
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regs.pc = (uint64_t) (uintptr_t) addr;
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if (aarch64_write_gregs(proc, ®s) < 0) {
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fprintf(stderr, "get_instruction_pointer: "
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"Couldn't write registers of %d.\n", proc->pid);
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return;
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}
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}
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arch_addr_t
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get_stack_pointer(struct process *proc)
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{
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struct user_pt_regs regs;
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if (aarch64_read_gregs(proc, ®s) < 0) {
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fprintf(stderr, "get_stack_pointer: "
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"Couldn't read registers of %d.\n", proc->pid);
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return 0;
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}
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/* XXX double cast */
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return (arch_addr_t) (uintptr_t) regs.sp;
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}
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arch_addr_t
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get_return_addr(struct process *proc, arch_addr_t stack_pointer)
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{
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struct user_pt_regs regs;
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if (aarch64_read_gregs(proc, ®s) < 0) {
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fprintf(stderr, "get_return_addr: "
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"Couldn't read registers of %d.\n", proc->pid);
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return 0;
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}
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/* XXX double cast */
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return (arch_addr_t) (uintptr_t) regs.regs[30];
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}
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