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/*
* xen/arch/arm/arm32/traps.c
*
* ARM AArch32 Specific Trap handlers
*
* Copyright (c) 2012 Citrix Systems.
*
* 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.
*/
#include <xen/lib.h>
#include <xen/kernel.h>
#include <xen/sched.h>
#include <public/xen.h>
#include <asm/mmio.h>
#include <asm/processor.h>
#include <asm/traps.h>
void do_trap_reset(struct cpu_user_regs *regs)
{
do_unexpected_trap("Reset", regs);
}
void do_trap_undefined_instruction(struct cpu_user_regs *regs)
{
uint32_t pc = regs->pc;
uint32_t instr;
if ( !is_kernel_text(pc) &&
(system_state >= SYS_STATE_active || !is_kernel_inittext(pc)) )
goto die;
/* PC should be always a multiple of 4, as Xen is using ARM instruction set */
if ( regs->pc & 0x3 )
goto die;
instr = *((uint32_t *)pc);
if ( instr != BUG_OPCODE )
goto die;
if ( do_bug_frame(regs, pc) )
goto die;
regs->pc += 4;
return;
die:
do_unexpected_trap("Undefined Instruction", regs);
}
void do_trap_hypervisor_call(struct cpu_user_regs *regs)
{
do_unexpected_trap("Hypervisor Call", regs);
}
void do_trap_prefetch_abort(struct cpu_user_regs *regs)
{
do_unexpected_trap("Prefetch Abort", regs);
}
void do_trap_data_abort(struct cpu_user_regs *regs)
{
/*
* We cannot distinguish between Asynchronous External Abort and
* Synchronous Data Abort.
*
* As asynchronous abort (aka SError) generated by the hypervisor will
* result in a crash of the system (see __do_trap_serror()), it is fine to
* do it here.
*/
if ( VABORT_GEN_BY_GUEST(regs) )
do_trap_guest_serror(regs);
else
do_trap_hyp_sync(regs);
}
void finalize_instr_emulation(const struct instr_details *instr)
{
/*
* We have not implemented decoding of post indexing instructions for 32 bit.
* Thus, this should be unreachable.
*/
if ( instr->state == INSTR_LDR_STR_POSTINDEXING )
domain_crash(current->domain);
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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