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tms34020: implement CLIP opcode (#5716)

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* tms34020: Fix out of bounds read, when extra logging is enabled

* tms34020: Annotate unimplemented clip opcode

* tms34020: Implement CLIP instruction
This commit is contained in:
Priit Laes 2019-10-06 16:09:49 +03:00 committed by ajrhacker
parent 4bbabbde2d
commit 290dad6ea1
2 changed files with 58 additions and 2 deletions
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55
src/devices/cpu/tms34010/34010ops.hxx
View File

@ -2107,7 +2107,60 @@ void tms340x0_device::cexec_s(uint16_t op)
void tms340x0_device::clip(uint16_t op)
{
if (!m_is_34020) { unimpl(op); return; }
logerror("020:clip\n");
XY daddr = DADDR_XY();
XY wstart = WSTART_XY();
XY wend = WEND_XY();
XY dydx = DYDX_XY();
// logerror("020:clip PC=0x%08x: WSTART=(%dx%d) WEND=(%dx%d) DADDR=(%dx%d) DYDX=(%dx%d)\n",
// m_pc, wstart.x, wstart.y, wend.x, wend.y, daddr.x, daddr.y, dydx.x, dydx.y);
// Check whether array intersects with window...
bool is_l = wstart.x < (daddr.x + dydx.x);
bool is_r = wend.x > daddr.x;
bool is_t = wstart.y < (daddr.y + dydx.y);
bool is_b = wend.y > daddr.y;
if (!(is_l || is_r || is_t || is_b))
{
// ...no itersection, set flags and return
m_st |= STBIT_Z | STBIT_V;
// TODO: manual does not specify cycles, only states that this is complex instruction
COUNT_CYCLES(3);
return;
}
CLR_V();
CLR_Z();
// Handle clipping if needed
bool array_clipped = false;
if (wstart.x > daddr.x)
{
DADDR_X() = wstart.x;
array_clipped = true;
}
if (wend.x < (daddr.x + dydx.x - 1))
{
DYDX_X() = wend.x - daddr.x;
array_clipped = true;
}
if (wstart.y > daddr.y)
{
DADDR_Y() = wstart.y;
array_clipped = true;
}
if (wend.y < (daddr.y + dydx.y - 1))
{
DYDX_Y() = wend.y - daddr.y;
array_clipped = true;
}
if (array_clipped)
m_st |= STBIT_V;
// TODO: manual does not specify cycles, only states that this is complex instruction
COUNT_CYCLES(3);
}
void tms340x0_device::cmovcg_a(uint16_t op)

5
src/devices/cpu/tms34010/tms34010.cpp
View File

@ -187,10 +187,13 @@ device_memory_interface::space_config_vector tms340x0_device::memory_space_confi
#define OFFSET() BREG(4)
#define WSTART_X() BREG_X(5)
#define WSTART_Y() BREG_Y(5)
#define WSTART_XY() BREG_XY(5)
#define WEND_X() BREG_X(6)
#define WEND_Y() BREG_Y(6)
#define WEND_XY() BREG_XY(6)
#define DYDX_X() BREG_X(7)
#define DYDX_Y() BREG_Y(7)
#define DYDX_XY() BREG_XY(7)
#define COLOR0() BREG(8)
#define COLOR1() BREG(9)
#define COUNT() BREG(10)
@ -1496,7 +1499,7 @@ u16 tms34020_device::io_register_r(offs_t offset)
{
int result, total;
LOGCONTROLREGS("%s: read %s\n", machine().describe_context(), ioreg_name[offset]);
LOGCONTROLREGS("%s: read %s\n", machine().describe_context(), ioreg020_name[offset]);
switch (offset)
{