157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
/*
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* This file is part of ltrace.
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* Copyright (C) 2013 Petr Machata, Red Hat Inc.
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* Copyright (C) 1998,2002,2004,2008,2009 Juan Cespedes
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* Copyright (C) 2009 Juan Cespedes
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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 "config.h"
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <asm/ptrace.h>
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#include <errno.h>
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#include "proc.h"
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#include "common.h"
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#include "regs.h"
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#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
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# define PTRACE_PEEKUSER PTRACE_PEEKUSR
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#endif
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#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
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# define PTRACE_POKEUSER PTRACE_POKEUSR
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#endif
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int
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arm_get_register(struct process *proc, enum arm_register reg, uint32_t *lp)
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{
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errno = 0;
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long l = ptrace(PTRACE_PEEKUSER, proc->pid, (void *)(reg * 4L), 0);
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if (l == -1 && errno != 0)
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return -1;
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*lp = (uint32_t)l;
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return 0;
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}
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int
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arm_set_register(struct process *proc, enum arm_register reg, uint32_t lp)
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{
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return ptrace(PTRACE_PEEKUSER, proc->pid,
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(void *)(reg * 4L), (void *)lp);
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}
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int
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arm_get_register_offpc(struct process *proc, enum arm_register reg,
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uint32_t *lp)
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{
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if (arm_get_register(proc, reg, lp) < 0)
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return -1;
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if (reg == ARM_REG_PC)
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*lp += 8;
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return 0;
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}
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int
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arm_get_shifted_register(struct process *proc, uint32_t inst, int carry,
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arch_addr_t pc_val, uint32_t *lp)
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{
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enum arm_register rm = BITS(inst, 0, 3);
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unsigned long shifttype = BITS(inst, 5, 6);
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uint32_t shift;
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if (BIT(inst, 4)) {
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if (arm_get_register_offpc(proc, BITS(inst, 8, 11), &shift) < 0)
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return -1;
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shift &= 0xff;
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} else {
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shift = BITS(inst, 7, 11);
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}
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uint32_t res;
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if (rm == ARM_REG_PC)
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/* xxx double cast */
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res = (uintptr_t)pc_val + (BIT(inst, 4) ? 12 : 8);
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else if (arm_get_register(proc, rm, &res) < 0)
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return -1;
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switch (shifttype) {
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case 0: /* LSL */
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res = shift >= 32 ? 0 : res << shift;
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break;
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case 1: /* LSR */
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res = shift >= 32 ? 0 : res >> shift;
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break;
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case 2: /* ASR */
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if (shift >= 32)
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shift = 31;
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res = ((res & 0x80000000L)
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? ~((~res) >> shift) : res >> shift);
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break;
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case 3: /* ROR/RRX */
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shift &= 31;
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if (shift == 0)
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res = (res >> 1) | (carry ? 0x80000000L : 0);
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else
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res = (res >> shift) | (res << (32 - shift));
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break;
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}
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*lp = res & 0xffffffff;
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return 0;
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}
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static arch_addr_t
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get_register_nocheck(struct process *proc, enum arm_register r)
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{
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uint32_t reg;
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if (arm_get_register(proc, r, ®) < 0)
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/* XXX double cast. */
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return (arch_addr_t)-1;
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/* XXX double cast. */
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return (arch_addr_t)(uintptr_t)reg;
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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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return get_register_nocheck(proc, ARM_REG_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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/* XXX double cast. */
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arm_set_register(proc, ARM_REG_PC, (uint32_t)addr);
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}
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void *
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get_stack_pointer(struct process *proc)
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{
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return get_register_nocheck(proc, ARM_REG_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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return get_register_nocheck(proc, ARM_REG_LR);
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}
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