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Bochs/bochs/iodev/iodebug.cc
Volker Ruppert 4dd5816108 Some changes in the Bochs plugins code. 
- Changed variable type of the plugin_t "type" member from enum to Bit16u.
- Added support for returning device flags with the new mode PLUGIN_FLAGS in
  the plugin entry functions. It is currently only used for devices that can
  be connected to a PCI slot.
- Code cleanup in core device plugins: checking type no longer necessary.
- The "non-plugin" mode now also uses the "loadtype" member of plugin_t.

TODO: Change PCI slot options to bx_param_enum_c and build the choices list
using the new capabilities of the plugin API.
2021-02-26 20:37:49 +00:00

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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001-2021 The Bochs Project
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
/////////////////////////////////////////////////////////////////////////
// Define BX_PLUGGABLE in files that can be compiled into plugins. For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE
#include "iodev.h"
#if BX_SUPPORT_IODEBUG
#include "cpu/cpu.h"
#include "iodebug.h"
#define BX_IODEBUG_THIS this->
bx_iodebug_c *theIODebugDevice = NULL;
PLUGIN_ENTRY_FOR_MODULE(iodebug)
{
if (mode == PLUGIN_INIT) {
theIODebugDevice = new bx_iodebug_c();
bx_devices.pluginIODebug = theIODebugDevice;
BX_REGISTER_DEVICE_DEVMODEL(plugin, type, theIODebugDevice, BX_PLUGIN_IODEBUG);
} else if (mode == PLUGIN_FINI) {
bx_devices.pluginIODebug = &bx_devices.stubIODebug;
delete theIODebugDevice;
} else if (mode == PLUGIN_PROBE) {
return (int)PLUGTYPE_OPTIONAL;
}
return(0); // Success
}
struct bx_iodebug_s_type {
bool enabled;
unsigned register_select;
Bit32u registers[2];
bx_phy_address monitored_mem_areas_start[BX_IODEBUG_MAX_AREAS];
bx_phy_address monitored_mem_areas_end[BX_IODEBUG_MAX_AREAS];
} bx_iodebug_s;
bx_iodebug_c::bx_iodebug_c()
{
put("iodebug", "IODBG");
}
void bx_iodebug_c::init(void)
{
DEV_register_ioread_handler(this, read_handler, 0x8A00,"BOCHS IODEBUG", 2);
DEV_register_iowrite_handler(this, write_handler, 0x8A00,"BOCHS IODEBUG", 2);
DEV_register_iowrite_handler(this, write_handler, 0x8A01,"BOCHS IODEBUG", 2);
bx_iodebug_s.enabled = 0;
bx_iodebug_s.register_select = 0;
for(int i=0;i<BX_IODEBUG_MAX_AREAS;i++) {
bx_iodebug_s.monitored_mem_areas_start[i] = 0;
bx_iodebug_s.monitored_mem_areas_end[i] = 0;
}
}
Bit32u bx_iodebug_c::read_handler(void *this_ptr, Bit32u addr, unsigned io_len)
{
bx_iodebug_c *bx_iodebug_ptr = (bx_iodebug_c *) this_ptr;
return bx_iodebug_ptr->read(addr, io_len);
}
Bit32u bx_iodebug_c::read(Bit32u addr, unsigned io_len)
{
if (bx_iodebug_s.enabled) return 0x8A00;
return(0);
}
void bx_iodebug_c::write_handler(void *this_ptr, Bit32u addr, Bit32u dvalue, unsigned io_len)
{
bx_iodebug_c *bx_iodebug_ptr = (bx_iodebug_c *) this_ptr;
bx_iodebug_ptr->write(addr, dvalue, io_len);
}
void bx_iodebug_c::write(Bit32u addr, Bit32u dvalue, unsigned io_len)
{
//fprintf(stderr, "IODEBUG addr: %4x\tdvalue: %8x\tio_len: %8x\n", (unsigned) addr, (unsigned) dvalue, io_len);
if (addr == 0x8A01)
{
bx_iodebug_s.registers[bx_iodebug_s.register_select] =
(bx_iodebug_s.registers[bx_iodebug_s.register_select] << 16) +
(dvalue & 0xFFFF);
}
if (addr != 0x8A00) return;
if (!bx_iodebug_s.enabled)
{
if(dvalue == 0x8A00)
{
bx_iodebug_s.enabled = 1;
// fprintf(stderr, "IODEBUG enabled\n");
bx_iodebug_s.registers[0] = 0;
bx_iodebug_s.registers[1] = 0;
}
return;
}
switch(dvalue)
{
case 0x8A01:
bx_iodebug_s.register_select = 0;
// fprintf(stderr, "IODEBUG register 0 selected\n");
break;
case 0x8A02:
bx_iodebug_s.register_select = 1;
// fprintf(stderr, "IODEBUG register 1 selected\n");
break;
case 0x8A80:
bx_iodebug_s.register_select = 0;
bx_iodebug_c::add_range(bx_iodebug_s.registers[0],
bx_iodebug_s.registers[1]);
bx_iodebug_s.registers[0] = 0;
bx_iodebug_s.registers[1] = 0;
break;
#if BX_DEBUGGER
case 0x8AE0:
fprintf(stderr, "request return to dbg prompt received, 0x8AE0 command (iodebug)\n");
bx_guard.interrupt_requested=1;
break;
case 0x8AE2:
fprintf(stderr, "request made by the guest os to disable tracing, iodebug port 0x8A00->0x8AE2\n");
BX_CPU(dbg_cpu)->trace = 0;
break;
case 0x8AE3:
fprintf(stderr, "request made by the guest os to enable tracing, iodebug port 0x8A00->0x8AE3\n");
BX_CPU(dbg_cpu)->trace = 1;
break;
case 0x8AE4:
fprintf(stderr, "request made by the guest os to disable register tracing, iodebug port 0x8A00->0x8AE4\n");
BX_CPU(dbg_cpu)->trace_reg = 0;
break;
case 0x8AE5:
fprintf(stderr, "request made by the guest os to enable register tracing, iodebug port 0x8A00->0x8AE5\n");
BX_CPU(dbg_cpu)->trace_reg = 1;
break;
#endif
case 0x8AFF:
bx_iodebug_s.enabled = 0;
// fprintf(stderr, "IODEBUG device deactivated\n");
// break;
// default:
// fprintf(stderr,"IODEBUG unsupported register code\n");
}
}
// Static function
void bx_iodebug_c::mem_write(BX_CPU_C *cpu, bx_phy_address addr, unsigned len, void *data)
{
if(! bx_iodebug_s.enabled) return;
unsigned area = bx_iodebug_c::range_test(addr, len);
// Device is enabled, testing address ranges
if(area)
{
area--;
#if BX_DEBUGGER
if (cpu != NULL) {
fprintf(stdout, "IODEBUG CPU %d @ eip: " FMT_ADDRX " write at monitored memory location " FMT_PHY_ADDRX "\n",
cpu->bx_cpuid, cpu->get_instruction_pointer(), addr);
}
else {
fprintf(stdout, "IODEBUG write at monitored memory location " FMT_PHY_ADDRX "\n", addr);
}
bx_guard.interrupt_requested=1;
#else
fprintf(stderr, "IODEBUG write to monitored memory area: %2u\t", area);
if (cpu != NULL)
fprintf(stderr, "by EIP:\t\t" FMT_ADDRX "\n\t", cpu->get_instruction_pointer());
else
fprintf(stderr, "(device origin)\t");
fprintf(stderr, "range start: \t\t" FMT_PHY_ADDRX "\trange end:\t" FMT_PHY_ADDRX "\n\taddress accessed:\t%08X\tdata written:\t",
bx_iodebug_s.monitored_mem_areas_start[area],
bx_iodebug_s.monitored_mem_areas_end[area],
(unsigned) addr);
switch(len)
{
case 1: {
Bit8u data8 = * ((Bit8u *) data);
fprintf(stderr,"%02X\n", (unsigned) data8);
break;
}
case 2: {
Bit16u data16 = * ((Bit16u *) data);
fprintf(stderr,"%04X\n", (unsigned) data16);
break;
}
case 4: {
Bit32u data32 = * ((Bit32u *) data);
fprintf(stderr,"%08X\n", (unsigned) data32);
break;
}
case 8: {
Bit64u data64 = * ((Bit64u *) data);
fprintf(stderr,"%08X%08x\n",
(unsigned) (data64 >> 32),
(unsigned) (data64 & 0xffffffff));
break;
}
default:
fprintf(stderr, "unsupported write size\n");
}
#endif
}
}
void bx_iodebug_c::mem_read(BX_CPU_C *cpu, bx_phy_address addr, unsigned len, void *data)
{
if(! bx_iodebug_s.enabled) return;
unsigned area = bx_iodebug_c::range_test(addr, len);
// Device is enabled, testing address ranges
if(area)
{
area--;
#if BX_DEBUGGER
if (cpu != NULL) {
fprintf(stdout, "IODEBUG CPU %d @ eip: " FMT_ADDRX " read at monitored memory location " FMT_PHY_ADDRX "\n",
cpu->bx_cpuid, cpu->get_instruction_pointer(), addr);
}
else {
fprintf(stdout, "IODEBUG read at monitored memory location " FMT_PHY_ADDRX "\n", addr);
}
bx_guard.interrupt_requested=1;
#else
fprintf(stderr, "IODEBUG read at monitored memory area: %2u\t", area);
if (cpu != NULL)
fprintf(stderr, "by EIP:\t\t" FMT_ADDRX "\n\t", cpu->get_instruction_pointer());
else
fprintf(stderr, "(device origin)\t");
fprintf(stderr, "range start: \t\t" FMT_PHY_ADDRX "\trange end:\t" FMT_PHY_ADDRX "\n\taddress accessed:\t" FMT_PHY_ADDRX "\tdata written:\t",
bx_iodebug_s.monitored_mem_areas_start[area],
bx_iodebug_s.monitored_mem_areas_end[area],
(unsigned) addr);
switch(len)
{
case 1: {
Bit8u data8 = * ((Bit8u *) data);
fprintf(stderr,"%02X\n", data8);
break;
}
case 2: {
Bit16u data16 = * ((Bit16u *) data);
fprintf(stderr,"%04X\n", data16);
break;
}
case 4: {
Bit32u data32 = * ((Bit32u *) data);
fprintf(stderr,"%08X\n", data32);
break;
}
case 8: {
Bit64u data64 = * ((Bit64u *) data);
fprintf(stderr,"%08X%08x\n",
(Bit32u)(data64 >> 32),
(Bit32u)(data64 & 0xffffffff));
break;
}
default:
fprintf(stderr, "unsupported read size\n");
}
#endif
}
}
unsigned bx_iodebug_c::range_test(bx_phy_address addr, unsigned len)
{
for(unsigned i=0;i<BX_IODEBUG_MAX_AREAS;i++)
{
if(bx_iodebug_s.monitored_mem_areas_start[i] != 0 ||
bx_iodebug_s.monitored_mem_areas_end[i] != 0)
{
if((Bit32u)(addr+len-1) < bx_iodebug_s.monitored_mem_areas_start[i])
continue;
if(addr < bx_iodebug_s.monitored_mem_areas_end[i])
{
return(++i);
}
}
}
return(0);
}
void bx_iodebug_c::add_range(bx_phy_address addr_start, bx_phy_address addr_end)
{
for(unsigned i=0;i<BX_IODEBUG_MAX_AREAS;i++)
{
if(!bx_iodebug_s.monitored_mem_areas_start[i] &&
!bx_iodebug_s.monitored_mem_areas_end[i])
{
bx_iodebug_s.monitored_mem_areas_start[i] = addr_start;
bx_iodebug_s.monitored_mem_areas_end[i] = addr_end;
// fprintf(stderr, "IODEBUG added range successfully in slot: %i\n",i);
return;
}
}
//fprintf(stderr, "IODEBUG unable to register memory range, all slots taken\n");
}
#endif /* if BX_SUPPORT_IODEBUG */
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