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|
// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/*********************************************************************
dvdisasm.c
Disassembly debugger view.
***************************************************************************/
#include "emu.h"
#include "debugvw.h"
#include "dvdisasm.h"
#include "debugcpu.h"
#include "debugger.h"
//**************************************************************************
// DEBUG VIEW DISASM SOURCE
//**************************************************************************
//-------------------------------------------------
// debug_view_disasm_source - constructor
//-------------------------------------------------
debug_view_disasm_source::debug_view_disasm_source(const char *name, device_t &device)
: debug_view_source(name, &device),
m_disasmintf(dynamic_cast<device_disasm_interface *>(&device)),
m_space(device.memory().space(AS_PROGRAM)),
m_decrypted_space(device.memory().has_space(AS_DECRYPTED_OPCODES) ? device.memory().space(AS_DECRYPTED_OPCODES) : device.memory().space(AS_PROGRAM))
{
}
//**************************************************************************
// DEBUG VIEW DISASM
//**************************************************************************
const int debug_view_disasm::DEFAULT_DASM_LINES, debug_view_disasm::DEFAULT_DASM_WIDTH, debug_view_disasm::DASM_MAX_BYTES;
//-------------------------------------------------
// debug_view_disasm - constructor
//-------------------------------------------------
debug_view_disasm::debug_view_disasm(running_machine &machine, debug_view_osd_update_func osdupdate, void *osdprivate)
: debug_view(machine, DVT_DISASSEMBLY, osdupdate, osdprivate),
m_right_column(DASM_RIGHTCOL_RAW),
m_backwards_steps(3),
m_dasm_width(DEFAULT_DASM_WIDTH),
m_last_direct_raw(nullptr),
m_last_direct_decrypted(nullptr),
m_last_change_count(0),
m_last_pcbyte(0),
m_divider1(0),
m_divider2(0),
m_divider3(0),
m_expression(machine)
{
// fail if no available sources
enumerate_sources();
if (m_source_list.count() == 0)
throw std::bad_alloc();
// count the number of comments
int total_comments = 0;
for (const debug_view_source &source : m_source_list)
{
const debug_view_disasm_source &dasmsource = downcast<const debug_view_disasm_source &>(source);
total_comments += dasmsource.device()->debug()->comment_count();
}
// configure the view
m_total.y = DEFAULT_DASM_LINES;
m_supports_cursor = true;
}
//-------------------------------------------------
// ~debug_view_disasm - destructor
//-------------------------------------------------
debug_view_disasm::~debug_view_disasm()
{
}
//-------------------------------------------------
// enumerate_sources - enumerate all possible
// sources for a disassembly view
//-------------------------------------------------
void debug_view_disasm::enumerate_sources()
{
// start with an empty list
m_source_list.reset();
// iterate over devices with disassembly interfaces
std::string name;
for (device_disasm_interface &dasm : disasm_interface_iterator(machine().root_device()))
{
name = string_format("%s '%s'", dasm.device().name(), dasm.device().tag());
if (dasm.device().memory().space_config(AS_PROGRAM)!=nullptr)
m_source_list.append(*global_alloc(debug_view_disasm_source(name.c_str(), dasm.device())));
}
// reset the source to a known good entry
set_source(*m_source_list.first());
}
//-------------------------------------------------
// view_notify - handle notification of updates
// to cursor changes
//-------------------------------------------------
void debug_view_disasm::view_notify(debug_view_notification type)
{
if (type == VIEW_NOTIFY_CURSOR_CHANGED)
adjust_visible_y_for_cursor();
else if (type == VIEW_NOTIFY_SOURCE_CHANGED)
m_expression.set_context(&downcast<const debug_view_disasm_source *>(m_source)->device()->debug()->symtable());
}
//-------------------------------------------------
// view_char - handle a character typed within
// the current view
//-------------------------------------------------
void debug_view_disasm::view_char(int chval)
{
debug_view_xy origcursor = m_cursor;
u8 end_buffer = 3;
s32 temp;
switch (chval)
{
case DCH_UP:
if (m_cursor.y > 0)
m_cursor.y--;
break;
case DCH_DOWN:
if (m_cursor.y < m_total.y - 1)
m_cursor.y++;
break;
case DCH_PUP:
temp = m_cursor.y - (m_visible.y - end_buffer);
if (temp < 0)
m_cursor.y = 0;
else
m_cursor.y = temp;
break;
case DCH_PDOWN:
temp = m_cursor.y + (m_visible.y - end_buffer);
if (temp > m_total.y - 1)
m_cursor.y = m_total.y - 1;
else
m_cursor.y = temp;
break;
case DCH_HOME: // set the active column to the PC
{
const debug_view_disasm_source &source = downcast<const debug_view_disasm_source &>(*m_source);
offs_t pc = source.m_space.address_to_byte(source.device()->safe_pcbase()) & source.m_space.logbytemask();
// figure out which row the pc is on
for (unsigned int curline = 0; curline < m_byteaddress.size(); curline++)
if (m_byteaddress[curline] == pc)
m_cursor.y = curline;
break;
}
case DCH_CTRLHOME:
m_cursor.y = 0;
break;
case DCH_CTRLEND:
m_cursor.y = m_total.y - 1;
break;
}
/* send a cursor changed notification */
if (m_cursor.y != origcursor.y)
{
begin_update();
view_notify(VIEW_NOTIFY_CURSOR_CHANGED);
m_update_pending = true;
end_update();
}
}
//-------------------------------------------------
// view_click - handle a mouse click within the
// current view
//-------------------------------------------------
void debug_view_disasm::view_click(const int button, const debug_view_xy& pos)
{
const debug_view_xy origcursor = m_cursor;
m_cursor = pos;
/* cursor popup|toggle */
bool cursorVisible = true;
if (m_cursor.y == origcursor.y)
{
cursorVisible = !m_cursor_visible;
}
/* send a cursor changed notification */
begin_update();
m_cursor_visible = cursorVisible;
view_notify(VIEW_NOTIFY_CURSOR_CHANGED);
m_update_pending = true;
end_update();
}
//-------------------------------------------------
// find_pc_backwards - back up the specified
// number of instructions from the given PC
//-------------------------------------------------
offs_t debug_view_disasm::find_pc_backwards(offs_t targetpc, int numinstrs)
{
const debug_view_disasm_source &source = downcast<const debug_view_disasm_source &>(*m_source);
// compute the increment
int minlen = source.m_space.byte_to_address(source.m_disasmintf->min_opcode_bytes());
if (minlen == 0) minlen = 1;
int maxlen = source.m_space.byte_to_address(source.m_disasmintf->max_opcode_bytes());
if (maxlen == 0) maxlen = 1;
// start off numinstrs back
offs_t curpc = targetpc - minlen * numinstrs;
if (curpc > targetpc)
curpc = 0;
/* loop until we find what we are looking for */
offs_t targetpcbyte = source.m_space.address_to_byte(targetpc) & source.m_space.logbytemask();
offs_t fillpcbyte = targetpcbyte;
offs_t lastgoodpc = targetpc;
while (1)
{
// fill the buffer up to the target
offs_t curpcbyte = source.m_space.address_to_byte(curpc) & source.m_space.logbytemask();
u8 opbuf[1024], argbuf[1024];
while (curpcbyte < fillpcbyte)
{
fillpcbyte--;
opbuf[1000 + fillpcbyte - targetpcbyte] = machine().debugger().cpu().read_opcode(source.m_decrypted_space, fillpcbyte, 1);
argbuf[1000 + fillpcbyte - targetpcbyte] = machine().debugger().cpu().read_opcode(source.m_space, fillpcbyte, 1);
}
// loop until we get past the target instruction
int instcount = 0;
int instlen;
offs_t scanpc;
for (scanpc = curpc; scanpc < targetpc; scanpc += instlen)
{
offs_t scanpcbyte = source.m_space.address_to_byte(scanpc) & source.m_space.logbytemask();
offs_t physpcbyte = scanpcbyte;
// get the disassembly, but only if mapped
instlen = 1;
if (source.m_space.device().memory().translate(source.m_space.spacenum(), TRANSLATE_FETCH, physpcbyte))
{
std::ostringstream dasmbuffer;
instlen = source.m_disasmintf->disassemble(dasmbuffer, scanpc, &opbuf[1000 + scanpcbyte - targetpcbyte], &argbuf[1000 + scanpcbyte - targetpcbyte]) & DASMFLAG_LENGTHMASK;
}
// count this one
instcount++;
}
// if we ended up right on targetpc, this is a good candidate
if (scanpc == targetpc && instcount <= numinstrs)
lastgoodpc = curpc;
// we're also done if we go back too far
if (targetpc - curpc >= numinstrs * maxlen)
break;
// and if we hit 0, we're done
if (curpc == 0)
break;
// back up one more and try again
curpc -= minlen;
if (curpc > targetpc)
curpc = 0;
}
return lastgoodpc;
}
//-------------------------------------------------
// generate_bytes - generate the opcode byte
// values
//-------------------------------------------------
void debug_view_disasm::generate_bytes(offs_t pcbyte, int numbytes, int minbytes, int maxchars, bool encrypted)
{
const debug_view_disasm_source &source = downcast<const debug_view_disasm_source &>(*m_source);
const int char_num = source.m_space.is_octal() ? 3 : 2;
const int base = m_dasm.tellp();
// output the first value
int offset = 0;
if (maxchars >= char_num * minbytes)
offset += util::stream_format(m_dasm, source.m_space.is_octal() ? "%0*o" : "%0*X", minbytes * char_num, machine().debugger().cpu().read_opcode(source.m_decrypted_space, pcbyte, minbytes));
// output subsequent values
int byte;
for (byte = minbytes; byte < numbytes && offset + 1 + char_num * minbytes < maxchars; byte += minbytes)
offset += util::stream_format(m_dasm, source.m_space.is_octal() ? " %0*o" : " %0*X", minbytes * char_num, machine().debugger().cpu().read_opcode(encrypted ? source.m_space : source.m_decrypted_space, pcbyte + byte, minbytes));
// if we ran out of room, indicate more
if ((byte < numbytes) && (byte != minbytes) && (maxchars > 3))
m_dasm.seekp(base + maxchars - 4) << "...";
}
//-------------------------------------------------
// recompute - recompute selected info for the
// disassembly view
//-------------------------------------------------
bool debug_view_disasm::recompute(offs_t pc, int startline, int lines)
{
util::ovectorstream buffer;
bool changed = false;
const debug_view_disasm_source &source = downcast<const debug_view_disasm_source &>(*m_source);
const int char_num = source.m_space.is_octal() ? 3 : 2;
// determine how many characters we need for an address and set the divider
m_divider1 = 1 + (source.m_space.logaddrchars()/2*char_num) + 1;
// assume a fixed number of characters for the disassembly
m_divider2 = m_divider1 + 1 + m_dasm_width + 1;
// determine how many bytes we might need to display
const int minbytes = source.m_disasmintf->min_opcode_bytes();
const int maxbytes = source.m_disasmintf->max_opcode_bytes();
// ensure that the PC is aligned to the minimum opcode size
pc &= ~source.m_space.byte_to_address_end(minbytes - 1);
// set the width of the third column according to display mode
if (m_right_column == DASM_RIGHTCOL_RAW || m_right_column == DASM_RIGHTCOL_ENCRYPTED)
{
int const maxbytes_clamped = (std::min)(maxbytes, DASM_MAX_BYTES);
m_total.x = m_divider2 + 1 + char_num * maxbytes_clamped + (maxbytes_clamped / minbytes - 1) + 1;
}
else if (m_right_column == DASM_RIGHTCOL_COMMENTS)
m_total.x = m_divider2 + 1 + 50; // DEBUG_COMMENT_MAX_LINE_LENGTH
else
m_total.x = m_divider2 + 1;
// allocate address array
m_byteaddress.resize(m_total.y);
// allocate disassembly buffer
const auto total_bytes = m_total.x * m_total.y;
m_dasm.clear();
m_dasm.reserve(total_bytes).seekp(total_bytes);
// iterate over lines
for (int line = 0; line < lines; line++)
{
// convert PC to a byte offset
const offs_t pcbyte = source.m_space.address_to_byte(pc) & source.m_space.logbytemask();
// save a copy of the previous line as a backup if we're only doing one line
const auto instr = startline + line;
const auto base = instr * m_total.x;
char oldbuf[100];
if (lines == 1)
std::memcpy(oldbuf, &m_dasm.vec()[base], (std::min<std::size_t>)(sizeof(oldbuf), m_total.x));
// convert back and set the address of this instruction
m_byteaddress[instr] = pcbyte;
m_dasm.clear();
util::stream_format(m_dasm.seekp(base),
source.m_space.is_octal() ? " %0*o " : " %0*X ",
source.m_space.logaddrchars()/2*char_num, source.m_space.byte_to_address(pcbyte));
// make sure we can translate the address, and then disassemble the result
buffer.clear();
buffer.seekp(0);
int numbytes = 0;
offs_t physpcbyte = pcbyte;
if (source.m_space.device().memory().translate(source.m_space.spacenum(), TRANSLATE_FETCH_DEBUG, physpcbyte))
{
u8 opbuf[64], argbuf[64];
// fetch the bytes up to the maximum
for (numbytes = 0; numbytes < maxbytes; numbytes++)
{
opbuf[numbytes] = machine().debugger().cpu().read_opcode(source.m_decrypted_space, pcbyte + numbytes, 1);
argbuf[numbytes] = machine().debugger().cpu().read_opcode(source.m_space, pcbyte + numbytes, 1);
}
// disassemble the result
pc += numbytes = source.m_disasmintf->disassemble(buffer, pc & source.m_space.logaddrmask(), opbuf, argbuf) & DASMFLAG_LENGTHMASK;
}
else
buffer << "<unmapped>";
buffer.put('\0');
// append the disassembly to the buffer
util::stream_format(m_dasm.seekp(base + m_divider1 + 1), "%2$-*1$.*1$s ", m_dasm_width, &buffer.vec()[0]);
// output the right column
if (m_right_column == DASM_RIGHTCOL_RAW || m_right_column == DASM_RIGHTCOL_ENCRYPTED)
{
// get the bytes
numbytes = source.m_space.address_to_byte(numbytes) & source.m_space.logbytemask();
m_dasm.seekp(base + m_divider2);
generate_bytes(pcbyte, numbytes, minbytes, m_total.x - m_divider2, m_right_column == DASM_RIGHTCOL_ENCRYPTED);
}
else if (m_right_column == DASM_RIGHTCOL_COMMENTS)
{
// get and add the comment, if present
const offs_t comment_address = source.m_space.byte_to_address(m_byteaddress[instr]);
const char *const text = source.device()->debug()->comment_text(comment_address);
if (text != nullptr)
util::stream_format(m_dasm.seekp(base + m_divider2), "// %.*s", m_total.x - m_divider2 - 4, text);
}
m_dasm.put('\0');
// see if the line changed at all
if (lines == 1 && strncmp(oldbuf, &m_dasm.vec()[base], (std::min<std::size_t>)(sizeof(oldbuf), m_total.x)) != 0)
changed = true;
}
// update opcode base information
m_last_direct_decrypted = source.m_decrypted_space.direct().ptr();
m_last_direct_raw = source.m_space.direct().ptr();
m_last_change_count = source.device()->debug()->comment_change_count();
// no longer need to recompute
m_recompute = false;
return changed;
}
//-------------------------------------------------
// view_update - update the contents of the
// disassembly view
//-------------------------------------------------
void debug_view_disasm::view_update()
{
const debug_view_disasm_source &source = downcast<const debug_view_disasm_source &>(*m_source);
offs_t pc = source.device()->safe_pcbase();
offs_t pcbyte = source.m_space.address_to_byte(pc) & source.m_space.logbytemask();
// update our context; if the expression is dirty, recompute
if (m_expression.dirty())
m_recompute = true;
// if we're tracking a value, make sure it is visible
u64 previous = m_expression.last_value();
u64 result = m_expression.value();
if (result != previous)
{
offs_t resultbyte = source.m_space.address_to_byte(result) & source.m_space.logbytemask();
// see if the new result is an address we already have
u32 row;
for (row = 0; row < m_byteaddress.size(); row++)
if (m_byteaddress[row] == resultbyte)
break;
// if we didn't find it, or if it's really close to the bottom, recompute
if (row == m_byteaddress.size() || row >= m_total.y - m_visible.y)
m_recompute = true;
// otherwise, if it's not visible, adjust the view so it is
else if (row < m_topleft.y || row >= m_topleft.y + m_visible.y - 2)
m_topleft.y = (row > 3) ? row - 3 : 0;
}
// if the opcode base has changed, rework things
if (source.m_decrypted_space.direct().ptr() != m_last_direct_decrypted || source.m_space.direct().ptr() != m_last_direct_raw)
m_recompute = true;
// if the comments have changed, redo it
if (m_last_change_count != source.device()->debug()->comment_change_count())
m_recompute = true;
// if we need to recompute, do it
bool recomputed_this_time = false;
recompute:
if (m_recompute)
{
// recompute the view
if (!m_byteaddress.empty() && m_last_change_count != source.device()->debug()->comment_change_count())
{
// smoosh us against the left column, but not the top row
m_topleft.x = 0;
// recompute from where we last recomputed!
recompute(source.m_space.byte_to_address(m_byteaddress[0]), 0, m_total.y);
}
else
{
// determine the addresses of what we will display
offs_t backpc = find_pc_backwards(u32(m_expression.value()), m_backwards_steps);
// put ourselves back in the top left
m_topleft.y = 0;
m_topleft.x = 0;
recompute(backpc, 0, m_total.y);
}
recomputed_this_time = true;
}
// figure out the row where the PC is and recompute the disassembly
if (pcbyte != m_last_pcbyte)
{
// find the row with the PC on it
for (u32 row = 0; row < m_visible.y; row++)
{
u32 effrow = m_topleft.y + row;
if (effrow >= m_byteaddress.size())
break;
if (pcbyte == m_byteaddress[effrow])
{
// see if we changed
bool changed = recompute(pc, effrow, 1);
if (changed && !recomputed_this_time)
{
m_recompute = true;
goto recompute;
}
// set the effective row and PC
m_cursor.y = effrow;
view_notify(VIEW_NOTIFY_CURSOR_CHANGED);
}
}
m_last_pcbyte = pcbyte;
}
// loop over visible rows
debug_view_char *dest = &m_viewdata[0];
for (u32 row = 0; row < m_visible.y; row++)
{
u32 effrow = m_topleft.y + row;
u32 col = 0;
// if this visible row is valid, add it to the buffer
u8 attrib = DCA_NORMAL;
if (effrow < m_byteaddress.size())
{
// if we're on the line with the PC, recompute and hilight it
if (pcbyte == m_byteaddress[effrow])
attrib = DCA_CURRENT;
// if we're on a line with a breakpoint, tag it changed
else
{
for (device_debug::breakpoint *bp = source.device()->debug()->breakpoint_first(); bp != nullptr; bp = bp->next())
if (m_byteaddress[effrow] == (source.m_space.address_to_byte(bp->address()) & source.m_space.logbytemask()))
attrib = DCA_CHANGED;
}
// if we're on the active column and everything is couth, highlight it
if (m_cursor_visible && effrow == m_cursor.y)
attrib |= DCA_SELECTED;
// if we've visited this pc, mark it as such
if (source.device()->debug()->track_pc_visited(m_byteaddress[effrow]))
attrib |= DCA_VISITED;
// get the effective string
const char *data = &m_dasm.vec()[effrow * m_total.x];
u32 len = u32(strlen(data));
// copy data
u32 effcol = m_topleft.x;
while (col < m_visible.x && effcol < len)
{
dest->byte = data[effcol++];
dest->attrib = (effcol <= m_divider1 || effcol >= m_divider2) ? (attrib | DCA_ANCILLARY) : attrib;
// comments are just green for now - maybe they shouldn't even be this?
if (effcol >= m_divider2 && m_right_column == DASM_RIGHTCOL_COMMENTS)
attrib |= DCA_COMMENT;
dest++;
col++;
}
}
// fill the rest with blanks
while (col < m_visible.x)
{
dest->byte = ' ';
dest->attrib = (effrow < m_total.y) ? (attrib | DCA_ANCILLARY) : attrib;
dest++;
col++;
}
}
}
//-------------------------------------------------
// selected_address - return the PC of the
// currently selected address in the view
//-------------------------------------------------
offs_t debug_view_disasm::selected_address()
{
flush_updates();
return downcast<const debug_view_disasm_source &>(*m_source).m_space.byte_to_address(m_byteaddress[m_cursor.y]);
}
//-------------------------------------------------
// set_sexpression - set the expression string
// describing the home address
//-------------------------------------------------
void debug_view_disasm::set_expression(const char *expression)
{
begin_update();
m_expression.set_string(expression);
m_recompute = m_update_pending = true;
end_update();
}
//-------------------------------------------------
// set_right_column - set the contents of the
// right column
//-------------------------------------------------
void debug_view_disasm::set_right_column(disasm_right_column contents)
{
begin_update();
m_right_column = contents;
m_recompute = m_update_pending = true;
end_update();
}
//-------------------------------------------------
// set_backward_steps - set the number of
// instructions displayed before the home address
//-------------------------------------------------
void debug_view_disasm::set_backward_steps(u32 steps)
{
begin_update();
m_backwards_steps = steps;
m_recompute = m_update_pending = true;
end_update();
}
//-------------------------------------------------
// set_disasm_width - set the width in characters
// of the main disassembly section
//-------------------------------------------------
void debug_view_disasm::set_disasm_width(u32 width)
{
begin_update();
m_dasm_width = width;
m_recompute = m_update_pending = true;
end_update();
}
//-------------------------------------------------
// set_selected_address - set the PC of the
// currently selected address in the view
//-------------------------------------------------
void debug_view_disasm::set_selected_address(offs_t address)
{
const debug_view_disasm_source &source = downcast<const debug_view_disasm_source &>(*m_source);
offs_t byteaddress = source.m_space.address_to_byte(address) & source.m_space.logbytemask();
for (int line = 0; line < m_total.y; line++)
if (m_byteaddress[line] == byteaddress)
{
m_cursor.y = line;
set_cursor_position(m_cursor);
break;
}
}
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