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/*
* 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];
}
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