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      1 /*
      2  * This file is part of ltrace.
      3  *
      4  * Copyright (C) 2013 Imagination Technologies Ltd.
      5  *
      6  * This program is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU General Public License
      8  * version 2 as published by the Free Software Foundation.
      9  *
     10  * This program is distributed in the hope that it will be useful, but
     11  * WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU General Public License
     16  * along with this program; if not, write to the Free Software
     17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
     18  * 02110-1301 USA
     19  */
     20 
     21 #include "config.h"
     22 
     23 #include <sys/types.h>
     24 #include <sys/ptrace.h>
     25 #include <linux/uio.h>
     26 #include <asm/ptrace.h>
     27 
     28 #include "proc.h"
     29 #include "common.h"
     30 
     31 arch_addr_t
     32 get_instruction_pointer(struct process *proc)
     33 {
     34 	struct user_gp_regs regs;
     35 	struct iovec iov;
     36 
     37 	iov.iov_base = &regs;
     38 	iov.iov_len = sizeof(regs);
     39 	if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS, (long)&iov))
     40 		return (void *)-1;
     41 
     42 	return (void *)regs.pc; /* PC */
     43 }
     44 
     45 void
     46 set_instruction_pointer(struct process *proc, arch_addr_t addr)
     47 {
     48 	struct user_gp_regs regs;
     49 	struct iovec iov;
     50 
     51 	iov.iov_base = &regs;
     52 	iov.iov_len = sizeof(regs);
     53 	if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS, (long)&iov))
     54 		return;
     55 
     56 	regs.pc = (unsigned long)addr;
     57 
     58 	iov.iov_base = &regs;
     59 	iov.iov_len = sizeof(regs);
     60 	ptrace(PTRACE_SETREGSET, proc->pid, NT_PRSTATUS, (long)&iov);
     61 }
     62 
     63 arch_addr_t
     64 get_stack_pointer(struct process *proc)
     65 {
     66 	struct user_gp_regs regs;
     67 	struct iovec iov;
     68 
     69 	iov.iov_base = &regs;
     70 	iov.iov_len = sizeof(regs);
     71 	if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS, (long)&iov))
     72 		return (void *)-1;
     73 
     74 	return (void *)regs.ax[0][0]; /* A0StP (A0.0) */
     75 }
     76 
     77 arch_addr_t
     78 get_return_addr(struct process *proc, void *stack_pointer)
     79 {
     80 	struct user_gp_regs regs;
     81 	struct iovec iov;
     82 
     83 	iov.iov_base = &regs;
     84 	iov.iov_len = sizeof(regs);
     85 	if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS, (long)&iov))
     86 		return (void *)-1;
     87 
     88 	return (void *)regs.dx[4][1]; /* D1RtP (D1.4) */
     89 }
     90