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/* kgdb support for MN10300
*
* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/ptrace.h>
#include <linux/kgdb.h>
#include <linux/uaccess.h>
#include <unit/leds.h>
#include <unit/serial.h>
#include <asm/debugger.h>
#include <asm/serial-regs.h>
#include "internal.h"
/*
* Copy kernel exception frame registers to the GDB register file
*/
void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
unsigned long ssp = (unsigned long) (regs + 1);
gdb_regs[GDB_FR_D0] = regs->d0;
gdb_regs[GDB_FR_D1] = regs->d1;
gdb_regs[GDB_FR_D2] = regs->d2;
gdb_regs[GDB_FR_D3] = regs->d3;
gdb_regs[GDB_FR_A0] = regs->a0;
gdb_regs[GDB_FR_A1] = regs->a1;
gdb_regs[GDB_FR_A2] = regs->a2;
gdb_regs[GDB_FR_A3] = regs->a3;
gdb_regs[GDB_FR_SP] = (regs->epsw & EPSW_nSL) ? regs->sp : ssp;
gdb_regs[GDB_FR_PC] = regs->pc;
gdb_regs[GDB_FR_MDR] = regs->mdr;
gdb_regs[GDB_FR_EPSW] = regs->epsw;
gdb_regs[GDB_FR_LIR] = regs->lir;
gdb_regs[GDB_FR_LAR] = regs->lar;
gdb_regs[GDB_FR_MDRQ] = regs->mdrq;
gdb_regs[GDB_FR_E0] = regs->e0;
gdb_regs[GDB_FR_E1] = regs->e1;
gdb_regs[GDB_FR_E2] = regs->e2;
gdb_regs[GDB_FR_E3] = regs->e3;
gdb_regs[GDB_FR_E4] = regs->e4;
gdb_regs[GDB_FR_E5] = regs->e5;
gdb_regs[GDB_FR_E6] = regs->e6;
gdb_regs[GDB_FR_E7] = regs->e7;
gdb_regs[GDB_FR_SSP] = ssp;
gdb_regs[GDB_FR_MSP] = 0;
gdb_regs[GDB_FR_USP] = regs->sp;
gdb_regs[GDB_FR_MCRH] = regs->mcrh;
gdb_regs[GDB_FR_MCRL] = regs->mcrl;
gdb_regs[GDB_FR_MCVF] = regs->mcvf;
gdb_regs[GDB_FR_DUMMY0] = 0;
gdb_regs[GDB_FR_DUMMY1] = 0;
gdb_regs[GDB_FR_FS0] = 0;
}
/*
* Extracts kernel SP/PC values understandable by gdb from the values
* saved by switch_to().
*/
void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
{
gdb_regs[GDB_FR_SSP] = p->thread.sp;
gdb_regs[GDB_FR_PC] = p->thread.pc;
gdb_regs[GDB_FR_A3] = p->thread.a3;
gdb_regs[GDB_FR_USP] = p->thread.usp;
gdb_regs[GDB_FR_FPCR] = p->thread.fpu_state.fpcr;
}
/*
* Fill kernel exception frame registers from the GDB register file
*/
void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
regs->d0 = gdb_regs[GDB_FR_D0];
regs->d1 = gdb_regs[GDB_FR_D1];
regs->d2 = gdb_regs[GDB_FR_D2];
regs->d3 = gdb_regs[GDB_FR_D3];
regs->a0 = gdb_regs[GDB_FR_A0];
regs->a1 = gdb_regs[GDB_FR_A1];
regs->a2 = gdb_regs[GDB_FR_A2];
regs->a3 = gdb_regs[GDB_FR_A3];
regs->sp = gdb_regs[GDB_FR_SP];
regs->pc = gdb_regs[GDB_FR_PC];
regs->mdr = gdb_regs[GDB_FR_MDR];
regs->epsw = gdb_regs[GDB_FR_EPSW];
regs->lir = gdb_regs[GDB_FR_LIR];
regs->lar = gdb_regs[GDB_FR_LAR];
regs->mdrq = gdb_regs[GDB_FR_MDRQ];
regs->e0 = gdb_regs[GDB_FR_E0];
regs->e1 = gdb_regs[GDB_FR_E1];
regs->e2 = gdb_regs[GDB_FR_E2];
regs->e3 = gdb_regs[GDB_FR_E3];
regs->e4 = gdb_regs[GDB_FR_E4];
regs->e5 = gdb_regs[GDB_FR_E5];
regs->e6 = gdb_regs[GDB_FR_E6];
regs->e7 = gdb_regs[GDB_FR_E7];
regs->sp = gdb_regs[GDB_FR_SSP];
/* gdb_regs[GDB_FR_MSP]; */
// regs->usp = gdb_regs[GDB_FR_USP];
regs->mcrh = gdb_regs[GDB_FR_MCRH];
regs->mcrl = gdb_regs[GDB_FR_MCRL];
regs->mcvf = gdb_regs[GDB_FR_MCVF];
/* gdb_regs[GDB_FR_DUMMY0]; */
/* gdb_regs[GDB_FR_DUMMY1]; */
// regs->fpcr = gdb_regs[GDB_FR_FPCR];
// regs->fs0 = gdb_regs[GDB_FR_FS0];
}
struct kgdb_arch arch_kgdb_ops = {
.gdb_bpt_instr = { 0xff },
.flags = KGDB_HW_BREAKPOINT,
};
/*
* Handle unknown packets and [Ccs] packets
*/
int kgdb_arch_handle_exception(int vector, int signo, int err_code,
char *remcom_in_buffer, char *remcom_out_buffer,
struct pt_regs *regs)
{
long addr;
char *ptr;
switch (remcom_in_buffer[0]) {
case 'c':
if (kgdb_contthread && kgdb_contthread != current) {
strcpy(remcom_out_buffer, "E00");
break;
}
kgdb_contthread = NULL;
/* try to read optional parameter, pc unchanged if no parm */
ptr = &remcom_in_buffer[1];
if (kgdb_hex2long(&ptr, &addr))
regs->pc = addr;
return 0;
case 's':
break; /* we don't do hardware single stepping */
}
return -1; /* this means that we do not want to exit from the handler */
}
/*
* Handle event interception
* - returns 0 if the exception should be skipped, -ERROR otherwise.
*/
int debugger_intercept(enum exception_code excep, int signo, int si_code,
struct pt_regs *regs)
{
int ret;
ret = kgdb_handle_exception(excep, signo, si_code, regs);
debugger_local_cache_flushinv();
return ret;
}
/*
* Determine if we've hit a debugger special breakpoint
*/
int at_debugger_breakpoint(struct pt_regs *regs)
{
return regs->pc == (unsigned long)&__arch_kgdb_breakpoint;
}
/*
* Initialise kgdb
*/
int kgdb_arch_init(void)
{
return 0;
}
/*
* Do something, perhaps, but don't know what.
*/
void kgdb_arch_exit(void)
{
}
#ifdef CONFIG_SMP
void debugger_nmi_interrupt(struct pt_regs *regs, enum exception_code code)
{
kgdb_nmicallback(arch_smp_processor_id(), regs);
debugger_local_cache_flushinv();
}
void kgdb_roundup_cpus(unsigned long flags)
{
smp_jump_to_debugger();
}
#endif
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