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