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Re: MSP430 SIM: Add support for hardware multiply
- From: Nicholas Clifton <nickc at redhat dot com>
- To: Mike Frysinger <vapier at gentoo dot org>, gdb-patches at sourceware dot org
- Date: Tue, 19 Aug 2014 11:36:36 +0100
- Subject: Re: MSP430 SIM: Add support for hardware multiply
- Authentication-results: sourceware.org; auth=none
- References: <87zjislnam dot fsf at redhat dot com> <5804568 dot hLA7fg3VQR at vapier>
Hi Mike,
the global static vars really look like they should be part of the cpu or sim
state and not just global variables. otherwise you can't easily reset them ?
Done:
sim/msp430/ChangeLog
2014-08-19 Nick Clifton <nickc@redhat.com>
* msp430-sim.c: Move static hardware multiply support variables
from here...
* msp430-sim.h (msp430_cpu_state): ... into here ...
* msp430-sim.c (get_op, put_op): ... and update references to use
the msp430_cpu_state structure.
diff --git a/sim/msp430/msp430-sim.c b/sim/msp430/msp430-sim.c
index 7812868..b9a6a7e 100644
--- a/sim/msp430/msp430-sim.c
+++ b/sim/msp430/msp430-sim.c
@@ -317,18 +317,6 @@ trace_reg_get (SIM_DESC sd, int n)
#define REG_GET(N) trace_reg_get (sd, N)
/* Hardware multiply (and accumulate) support. */
-static enum { UNSIGN_32, SIGN_32, UNSIGN_MAC_32, SIGN_MAC_32 } hwmult_type;
-static unsigned32 hwmult_op1;
-static unsigned32 hwmult_op2;
-static unsigned32 hwmult_result;
-static signed32 hwmult_signed_result;
-static unsigned32 hwmult_accumulator;
-static signed32 hwmult_signed_accumulator;
-
-static enum { UNSIGN_64, SIGN_64 } hw32mult_type;
-static unsigned64 hw32mult_op1;
-static unsigned64 hw32mult_op2;
-static unsigned64 hw32mult_result;
static unsigned int
zero_ext (unsigned int v, unsigned int bits)
@@ -413,65 +401,69 @@ get_op (SIM_DESC sd, MSP430_Opcode_Decoded *opc, int n)
switch (addr)
{
case 0x13A:
- switch (hwmult_type)
+ switch (HWMULT (sd, hwmult_type))
{
case UNSIGN_MAC_32:
- case UNSIGN_32: rv = zero_ext (hwmult_result, 16); break;
+ case UNSIGN_32:
+ rv = zero_ext (HWMULT (sd, hwmult_result), 16);
+ break;
case SIGN_MAC_32:
- case SIGN_32: rv = sign_ext (hwmult_signed_result, 16); break;
+ case SIGN_32:
+ rv = sign_ext (HWMULT (sd, hwmult_signed_result), 16);
+ break;
}
break;
case 0x13C:
- switch (hwmult_type)
+ switch (HWMULT (sd, hwmult_type))
{
case UNSIGN_MAC_32:
case UNSIGN_32:
- rv = zero_ext (hwmult_result >> 16, 16);
+ rv = zero_ext (HWMULT (sd, hwmult_result) >> 16, 16);
break;
case SIGN_MAC_32:
case SIGN_32:
- rv = sign_ext (hwmult_signed_result >> 16, 16);
+ rv = sign_ext (HWMULT (sd, hwmult_signed_result) >> 16, 16);
break;
}
break;
case 0x13E:
- switch (hwmult_type)
+ switch (HWMULT (sd, hwmult_type))
{
case UNSIGN_32:
rv = 0;
break;
case SIGN_32:
- rv = hwmult_signed_result < 0 ? -1 : 0;
+ rv = HWMULT (sd, hwmult_signed_result) < 0 ? -1 : 0;
break;
case UNSIGN_MAC_32:
rv = 0; /* FIXME: Should be carry of last accumulate. */
break;
case SIGN_MAC_32:
- rv = hwmult_signed_accumulator < 0 ? -1 : 0;
+ rv = HWMULT (sd, hwmult_signed_accumulator) < 0 ? -1 : 0;
break;
}
break;
case 0x154:
- rv = zero_ext (hw32mult_result, 16);
+ rv = zero_ext (HWMULT (sd, hw32mult_result), 16);
break;
case 0x156:
- rv = zero_ext (hw32mult_result >> 16, 16);
+ rv = zero_ext (HWMULT (sd, hw32mult_result) >> 16, 16);
break;
case 0x158:
- rv = zero_ext (hw32mult_result >> 32, 16);
+ rv = zero_ext (HWMULT (sd, hw32mult_result) >> 32, 16);
break;
case 0x15A:
- switch (hw32mult_type)
+ switch (HWMULT (sd, hw32mult_type))
{
- case UNSIGN_64: rv = zero_ext (hw32mult_result >> 48, 16); break;
- case SIGN_64: rv = sign_ext (hw32mult_result >> 48, 16); break;
+ case UNSIGN_64: rv = zero_ext (HWMULT (sd, hw32mult_result) >> 48, 16); break;
+ case SIGN_64: rv = sign_ext (HWMULT (sd, hw32mult_result) >> 48, 16); break;
}
break;
@@ -582,77 +574,91 @@ put_op (SIM_DESC sd, MSP430_Opcode_Decoded *opc, int n, int val)
switch (addr)
{
- case 0x130: hwmult_op1 = val; hwmult_type = UNSIGN_32; break;
- case 0x132: hwmult_op1 = val; hwmult_type = SIGN_32; break;
- case 0x134: hwmult_op1 = val; hwmult_type = UNSIGN_MAC_32; break;
- case 0x136: hwmult_op1 = val; hwmult_type = SIGN_MAC_32; break;
+ case 0x130: HWMULT (sd, hwmult_op1) = val; HWMULT (sd, hwmult_type) = UNSIGN_32; break;
+ case 0x132: HWMULT (sd, hwmult_op1) = val; HWMULT (sd, hwmult_type) = SIGN_32; break;
+ case 0x134: HWMULT (sd, hwmult_op1) = val; HWMULT (sd, hwmult_type) = UNSIGN_MAC_32; break;
+ case 0x136: HWMULT (sd, hwmult_op1) = val; HWMULT (sd, hwmult_type) = SIGN_MAC_32; break;
- case 0x138: hwmult_op2 = val;
- switch (hwmult_type)
+ case 0x138: HWMULT (sd, hwmult_op2) = val;
+ switch (HWMULT (sd, hwmult_type))
{
case UNSIGN_32:
- hwmult_result = hwmult_op1 * hwmult_op2;
- hwmult_signed_result = (signed) hwmult_result;
- hwmult_accumulator = hwmult_signed_accumulator = 0;
+ HWMULT (sd, hwmult_result) = HWMULT (sd, hwmult_op1) * HWMULT (sd, hwmult_op2);
+ HWMULT (sd, hwmult_signed_result) = (signed) HWMULT (sd, hwmult_result);
+ HWMULT (sd, hwmult_accumulator) = HWMULT (sd, hwmult_signed_accumulator) = 0;
break;
case SIGN_32:
- a = sign_ext (hwmult_op1, 16);
- b = sign_ext (hwmult_op2, 16);
- hwmult_signed_result = a * b;
- hwmult_result = (unsigned) hwmult_signed_result;
- hwmult_accumulator = hwmult_signed_accumulator = 0;
+ a = sign_ext (HWMULT (sd, hwmult_op1), 16);
+ b = sign_ext (HWMULT (sd, hwmult_op2), 16);
+ HWMULT (sd, hwmult_signed_result) = a * b;
+ HWMULT (sd, hwmult_result) = (unsigned) HWMULT (sd, hwmult_signed_result);
+ HWMULT (sd, hwmult_accumulator) = HWMULT (sd, hwmult_signed_accumulator) = 0;
break;
case UNSIGN_MAC_32:
- hwmult_accumulator += hwmult_op1 * hwmult_op2;
- hwmult_signed_accumulator += hwmult_op1 * hwmult_op2;
- hwmult_result = hwmult_accumulator;
- hwmult_signed_result = hwmult_signed_accumulator;
+ HWMULT (sd, hwmult_accumulator) += HWMULT (sd, hwmult_op1) * HWMULT (sd, hwmult_op2);
+ HWMULT (sd, hwmult_signed_accumulator) += HWMULT (sd, hwmult_op1) * HWMULT (sd, hwmult_op2);
+ HWMULT (sd, hwmult_result) = HWMULT (sd, hwmult_accumulator);
+ HWMULT (sd, hwmult_signed_result) = HWMULT (sd, hwmult_signed_accumulator);
break;
case SIGN_MAC_32:
- a = sign_ext (hwmult_op1, 16);
- b = sign_ext (hwmult_op2, 16);
- hwmult_accumulator += a * b;
- hwmult_signed_accumulator += a * b;
- hwmult_result = hwmult_accumulator;
- hwmult_signed_result = hwmult_signed_accumulator;
+ a = sign_ext (HWMULT (sd, hwmult_op1), 16);
+ b = sign_ext (HWMULT (sd, hwmult_op2), 16);
+ HWMULT (sd, hwmult_accumulator) += a * b;
+ HWMULT (sd, hwmult_signed_accumulator) += a * b;
+ HWMULT (sd, hwmult_result) = HWMULT (sd, hwmult_accumulator);
+ HWMULT (sd, hwmult_signed_result) = HWMULT (sd, hwmult_signed_accumulator);
break;
}
break;
case 0x13a:
/* Copy into LOW result... */
- switch (hwmult_type)
+ switch (HWMULT (sd, hwmult_type))
{
case UNSIGN_MAC_32:
case UNSIGN_32:
- hwmult_accumulator = hwmult_result = zero_ext (val, 16);
- hwmult_signed_accumulator = sign_ext (val, 16);
+ HWMULT (sd, hwmult_accumulator) = HWMULT (sd, hwmult_result) = zero_ext (val, 16);
+ HWMULT (sd, hwmult_signed_accumulator) = sign_ext (val, 16);
break;
case SIGN_MAC_32:
case SIGN_32:
- hwmult_signed_accumulator = hwmult_result = sign_ext (val, 16);
- hwmult_accumulator = zero_ext (val, 16);
+ HWMULT (sd, hwmult_signed_accumulator) = HWMULT (sd, hwmult_result) = sign_ext (val, 16);
+ HWMULT (sd, hwmult_accumulator) = zero_ext (val, 16);
break;
}
break;
- case 0x140: hw32mult_op1 = val; hw32mult_type = UNSIGN_64; break;
- case 0x142: hw32mult_op1 = (hw32mult_op1 & 0xFFFF) | (val << 16); break;
- case 0x144: hw32mult_op1 = val; hw32mult_type = SIGN_64; break;
- case 0x146: hw32mult_op1 = (hw32mult_op1 & 0xFFFF) | (val << 16); break;
- case 0x150: hw32mult_op2 = val; break;
-
- case 0x152: hw32mult_op2 = (hw32mult_op2 & 0xFFFF) | (val << 16);
- switch (hw32mult_type)
+ case 0x140:
+ HWMULT (sd, hw32mult_op1) = val;
+ HWMULT (sd, hw32mult_type) = UNSIGN_64;
+ break;
+ case 0x142:
+ HWMULT (sd, hw32mult_op1) = (HWMULT (sd, hw32mult_op1) & 0xFFFF) | (val << 16);
+ break;
+ case 0x144:
+ HWMULT (sd, hw32mult_op1) = val;
+ HWMULT (sd, hw32mult_type) = SIGN_64;
+ break;
+ case 0x146:
+ HWMULT (sd, hw32mult_op1) = (HWMULT (sd, hw32mult_op1) & 0xFFFF) | (val << 16);
+ break;
+ case 0x150:
+ HWMULT (sd, hw32mult_op2) = val;
+ break;
+
+ case 0x152:
+ HWMULT (sd, hw32mult_op2) = (HWMULT (sd, hw32mult_op2) & 0xFFFF) | (val << 16);
+ switch (HWMULT (sd, hw32mult_type))
{
case UNSIGN_64:
- hw32mult_result = hw32mult_op1 * hw32mult_op2;
+ HWMULT (sd, hw32mult_result) = HWMULT (sd, hw32mult_op1) * HWMULT (sd, hw32mult_op2);
break;
case SIGN_64:
- hw32mult_result = sign_ext (hw32mult_op1, 32) * sign_ext (hw32mult_op2, 32);
+ HWMULT (sd, hw32mult_result) = sign_ext (HWMULT (sd, hw32mult_op1), 32)
+ * sign_ext (HWMULT (sd, hw32mult_op2), 32);
break;
}
break;
diff --git a/sim/msp430/msp430-sim.h b/sim/msp430/msp430-sim.h
index 1865e4e..2a0912e 100644
--- a/sim/msp430/msp430-sim.h
+++ b/sim/msp430/msp430-sim.h
@@ -21,11 +21,29 @@
#ifndef _MSP430_SIM_H_
#define _MSP430_SIM_H_
+typedef enum { UNSIGN_32, SIGN_32, UNSIGN_MAC_32, SIGN_MAC_32 } hwmult_type;
+typedef enum { UNSIGN_64, SIGN_64 } hw32mult_type;
+
struct msp430_cpu_state
{
int regs[16];
int cio_breakpoint;
int cio_buffer;
+
+ hwmult_type hwmult_type;
+ unsigned32 hwmult_op1;
+ unsigned32 hwmult_op2;
+ unsigned32 hwmult_result;
+ signed32 hwmult_signed_result;
+ unsigned32 hwmult_accumulator;
+ signed32 hwmult_signed_accumulator;
+
+ hw32mult_type hw32mult_type;
+ unsigned64 hw32mult_op1;
+ unsigned64 hw32mult_op2;
+ unsigned64 hw32mult_result;
};
+#define HWMULT(SD, FIELD) MSP430_CPU (SD)->state.FIELD
+
#endif