Add determining when we do not have enough writeback slots; Do not do model specific...

diff --git a/sim/ppc/ChangeLog b/sim/ppc/ChangeLog
index 2a4a55f..0ac2c75 100644 (file)
--- a/sim/ppc/ChangeLog
+++ b/sim/ppc/ChangeLog
@@ -1,3 +1,31 @@
+Tue Nov 28 13:38:26 1995  Michael Meissner  <meissner@tiktok.cygnus.com>
+
+       * configure{,.in} (--enable-sim-model-issue): Instead of defining
+       0/1, define it to be MODEL_ISSUE_{PROCESS,IGNORE}.
+
+       * std-config.h (WITH_MODEL_ISSUE): Default to 0.
+       (CURRENT_MODEL_ISSUE): Reference WITH_MODEL_ISSUE, and if that is
+       0, use current_model_issue.
+
+       * psim.c (current_model_issue): New global variable.
+
+       * cpu.c (cpu_create): Use CURRENT_MODEL_ISSUE > 0 instead of
+       WITH_MODEL_ISSUE.
+       (cpu_{init,halt}): Ditto.
+       * mon.c (mon_print_info): Ditto.
+       * ppc-instructions (PPC_INSN_* macros, branch handling): Ditto.
+
+       * mon.c (mon_print_info): Print instructins/second if verbose > 0,
+       rather than > 1.
+
+       * main.c (main): Set current_model_issue to MODEL_ISSUE_PROCESS if
+       the -I switch is used.
+       * sim_calls (sim_open): Ditto.
+
+       * ppc-instructions (model support): Add support for determining
+       when we don't have enough writeback slots.  Add tracing for the
+       beginning of each cycle.
+
 Mon Nov 27 17:46:33 1995  Michael Meissner  <meissner@tiktok.cygnus.com>
 
        * mon.c: Check for whether to include sys/types.h and sys/time.h.

diff --git a/sim/ppc/configure b/sim/ppc/configure
index b8f3443..f172a5c 100755 (executable)
--- a/sim/ppc/configure
+++ b/sim/ppc/configure
@@ -909,8 +909,8 @@ fi
 enableval="$enable_sim_model_issue"
 if test -n "$enableval"; then
   case "${enableval}" in
-  yes) sim_model_issue="-DWITH_MODEL_ISSUE=1";;
-  no)  sim_model_issue="-DWITH_MODEL_ISSUE=0";;
+  yes) sim_model_issue="-DWITH_MODEL_ISSUE=MODEL_ISSUE_PROCESS";;
+  no)  sim_model_issue="-DWITH_MODEL_ISSUE=MODEL_ISSUE_IGNORE";;
   *)   { echo "configure: error: "--enable-sim-model-issue does not take a value"" 1>&2; exit 1; }; sim_model_issue="";;
 esac
 if test x"$silent" != x"yes"; then

diff --git a/sim/ppc/configure.in b/sim/ppc/configure.in
index 0a708d2..a8382ce 100644 (file)
--- a/sim/ppc/configure.in
+++ b/sim/ppc/configure.in
@@ -353,8 +353,8 @@ fi],[sim_model=""])dnl
 AC_ARG_ENABLE(sim-model-issue,
 [  --enable-sim-model-issue            Specify whether to simulate model specific actions],
 [case "${enableval}" in
-  yes) sim_model_issue="-DWITH_MODEL_ISSUE=1";;
-  no)  sim_model_issue="-DWITH_MODEL_ISSUE=0";;
+  yes) sim_model_issue="-DWITH_MODEL_ISSUE=MODEL_ISSUE_PROCESS";;
+  no)  sim_model_issue="-DWITH_MODEL_ISSUE=MODEL_ISSUE_IGNORE";;
   *)   AC_MSG_ERROR("--enable-sim-model-issue does not take a value"); sim_model_issue="";;
 esac
 if test x"$silent" != x"yes"; then

diff --git a/sim/ppc/cpu.c b/sim/ppc/cpu.c
index 33094fe..ef8cfeb 100644 (file)
--- a/sim/ppc/cpu.c
+++ b/sim/ppc/cpu.c
@@ -96,7 +96,9 @@ cpu_create(psim *system,
   processor->virtual = vm_create(memory);
   processor->instruction_map = vm_create_instruction_map(processor->virtual);
   processor->data_map = vm_create_data_map(processor->virtual);
-  processor->model_ptr = model_create (processor);
+
+  if (CURRENT_MODEL_ISSUE > 0)
+    processor->model_ptr = model_create (processor);
 
   /* link back to core system */
   processor->system = system;
@@ -114,7 +116,8 @@ cpu_init(cpu *processor)
   memset(&processor->regs, 0, sizeof(processor->regs));
   /* FIXME - should any of VM be inited also ? */
 
-  model_init (processor, processor->model_ptr);
+  if (CURRENT_MODEL_ISSUE > 0)
+    model_init (processor->model_ptr);
 }
 
 
@@ -247,7 +250,9 @@ cpu_halt(cpu *processor,
          signal);
   }
   else {
-    model_halt(processor, processor->model_ptr);
+    if (CURRENT_MODEL_ISSUE > 0)
+      model_halt(processor->model_ptr);
+
     processor->program_counter = cia;
     psim_halt(processor->system, processor->cpu_nr, cia, reason, signal);
   }

diff --git a/sim/ppc/main.c b/sim/ppc/main.c
index 8df9276..41791a1 100644 (file)
--- a/sim/ppc/main.c
+++ b/sim/ppc/main.c
@@ -23,7 +23,7 @@
 #include <stdio.h>
 
 #include "psim.h"
-#include "function_unit.h"
+#include "cpu.h"
 #include "options.h"
 
 #ifdef HAVE_STDLIB_H
@@ -116,6 +116,7 @@ main(int argc, char **argv)
        print_info = 1;
        break;
       case 'I':
+       current_model_issue = MODEL_ISSUE_PROCESS;
        print_info = 2;
        break;
       default:

diff --git a/sim/ppc/mon.c b/sim/ppc/mon.c
index 30bbbc4..3fe2f32 100644 (file)
--- a/sim/ppc/mon.c
+++ b/sim/ppc/mon.c
@@ -228,7 +228,7 @@ mon_print_info(psim *system,
   len_cpu = strlen (buffer);
 
 #ifdef HAVE_GETRUSAGE
-  if (total_insns && verbose > 1)
+  if (total_insns && verbose)
     {
       struct rusage mytime;
       if (getrusage (RUSAGE_SELF, &mytime) == 0
@@ -273,7 +273,7 @@ mon_print_info(psim *system,
       printf_filtered ("\n");
     }
 
-    if (WITH_MODEL_ISSUE)
+    if (CURRENT_MODEL_ISSUE > 0)
       {
        model_data *model_ptr = cpu_model(psim_cpu(system, cpu_nr));
        model_print *ptr = model_mon_info(model_ptr);
@@ -351,7 +351,7 @@ mon_print_info(psim *system,
 
   if (cpu_insns_second)
     printf_filtered ("%sSimulator speed was %s instructions/second\n",
-                    (monitor->nr_cpus <= 1 && verbose <= 1) ? "" : "\n",
+                    (monitor->nr_cpus > 1) ? "" : "\n",
                     mon_add_commas(buffer, sizeof(buffer), cpu_insns_second));
 }
 

diff --git a/sim/ppc/ppc-instructions b/sim/ppc/ppc-instructions
index ef15b8d..9553b71 100644 (file)
--- a/sim/ppc/ppc-instructions
+++ b/sim/ppc/ppc-instructions
@@ -76,7 +76,7 @@
 ::model-macro:::
        #define PPC_INSN_INT(OUT_MASK, IN_MASK, RC) \
                do { \
-                 if (WITH_MODEL_ISSUE) { \
+                 if (CURRENT_MODEL_ISSUE > 0) { \
                    if (RC) \
                      ppc_insn_int(my_index, cpu_model(processor), OUT_MASK, IN_MASK); \
                    else \
@@ -86,19 +86,19 @@
 
        #define PPC_INSN_INT_CR(OUT_MASK, IN_MASK, CR_MASK) \
                do { \
-                 if (WITH_MODEL_ISSUE) \
+                 if (CURRENT_MODEL_ISSUE > 0) \
                    ppc_insn_int_cr(my_index, cpu_model(processor), OUT_MASK, IN_MASK, CR_MASK); \
                } while (0)
 
        #define PPC_INSN_CR(OUT_MASK, IN_MASK) \
                do { \
-                 if (WITH_MODEL_ISSUE) \
+                 if (CURRENT_MODEL_ISSUE > 0) \
                    ppc_insn_cr(my_index, cpu_model(processor), OUT_MASK, IN_MASK); \
                } while (0)
 
        #define PPC_INSN_FLOAT(OUT_MASK, IN_MASK, RC) \
                do { \
-                 if (WITH_MODEL_ISSUE) { \
+                 if (CURRENT_MODEL_ISSUE > 0) { \
                    if (RC) \
                      ppc_insn_float(my_index, cpu_model(processor), OUT_MASK, IN_MASK); \
                    else \
@@ -108,37 +108,37 @@
 
        #define PPC_INSN_FLOAT_CR(OUT_MASK, IN_MASK, CR_MASK) \
                do { \
-                 if (WITH_MODEL_ISSUE) \
+                 if (CURRENT_MODEL_ISSUE > 0) \
                    ppc_insn_float_cr(my_index, cpu_model(processor), OUT_MASK, IN_MASK, CR_MASK); \
                } while (0)
 
        #define PPC_INSN_INT_FLOAT(OUT_INT_MASK, OUT_FP_MASK, IN_INT_MASK, IN_FP_MASK) \
                do { \
-                 if (WITH_MODEL_ISSUE) \
+                 if (CURRENT_MODEL_ISSUE > 0) \
                    ppc_insn_int_float(my_index, cpu_model(processor), OUT_INT_MASK, OUT_FP_MASK, IN_INT_MASK, IN_FP_MASK); \
                } while (0)
 
        #define PPC_INSN_FROM_SPR(INT_MASK, SPR) \
                do { \
-                 if (WITH_MODEL_ISSUE) \
+                 if (CURRENT_MODEL_ISSUE > 0) \
                    ppc_insn_from_spr(my_index, cpu_model(processor), INT_MASK, SPR); \
                } while (0)
 
        #define PPC_INSN_TO_SPR(INT_MASK, SPR) \
                do { \
-                 if (WITH_MODEL_ISSUE) \
+                 if (CURRENT_MODEL_ISSUE > 0) \
                    ppc_insn_to_spr(my_index, cpu_model(processor), INT_MASK, SPR); \
                } while (0)
 
        #define PPC_INSN_MFCR(INT_MASK) \
                do { \
-                 if (WITH_MODEL_ISSUE) \
+                 if (CURRENT_MODEL_ISSUE > 0) \
                    ppc_insn_mfcr(my_index, cpu_model(processor), INT_MASK); \
                } while (0)
 
        #define PPC_INSN_MTCR(INT_MASK, FXM) \
                do { \
-                 if (WITH_MODEL_ISSUE) \
+                 if (CURRENT_MODEL_ISSUE > 0) \
                    ppc_insn_mtcr(my_index, cpu_model(processor), INT_MASK, FXM); \
                } while (0)
 
@@ -171,6 +171,9 @@
 
        #define PPC_NO_SPR      (-1)                    /* flag for no SPR register */
 
+       /* Return if 1 bit set */
+       #define PPC_ONE_BIT_SET_P(x) (((x) & ((x)-1)) == 0)
+
        /* Structure for each functional unit that is busy */
        typedef struct _model_busy model_busy;
        struct _model_busy {
@@ -180,8 +183,9 @@
          unsigned32 fp_busy;                           /* floating point registers that are busy */
          unsigned32 cr_fpscr_busy;                     /* CR/FPSCR registers that are busy */
          signed16 spr_busy;                            /* SPR register that is busy or PPC_NO_SPR */
-         signed8 issue;                                /* # of cycles until unit can accept another insn */
-         signed8 done;                                 /* # of cycles until insn is done */
+         signed16 issue;                               /* # of cycles until unit can accept another insn */
+         signed16 done;                                /* # of cycles until insn is done */
+         signed16 nr_writebacks;                       /* # of registers this unit writes back */
        };
 
        /* Structure to hold the current state information for the simulated CPU model */
@@ -189,7 +193,8 @@
          cpu *processor;                               /* point back to processor */
          const char *name;                             /* model name */
          const model_time *timing;                     /* timing information */
-         model_busy *busy_list;                        /* list of busy function units */
+         model_busy busy_head;                         /* dummy entry to head list of busy function units */
+         model_busy *busy_tail;                        /* tail of list of busy function units */
          model_busy *free_list;                        /* list of model_busy structs not in use */
          count_type nr_cycles;                         /* # cycles */
          count_type nr_branches;                       /* # branches */
@@ -201,7 +206,9 @@
          count_type nr_stalls_data;                    /* # of stalls for data */
          count_type nr_stalls_unit;                    /* # of stalls waiting for a function unit */
          count_type nr_stalls_serialize;               /* # of stalls waiting for things to quiet down */
+         count_type nr_stalls_writeback;               /* # of stalls waiting for a writeback slot */
          count_type nr_units[nr_ppc_function_units];   /* function unit counts */
+         int max_nr_writebacks;                        /* max # of writeback slots available */
          unsigned32 int_busy;                          /* int registers that are busy */
          unsigned32 fp_busy;                           /* floating point registers that are busy */
          unsigned32 cr_fpscr_busy;                     /* CR/FPSCR registers that are busy */
@@ -271,7 +278,8 @@
 # Trace releasing resources
 void::model-static::model_trace_release:model_data *model_ptr, model_busy *busy
        int i;
-       TRACE(trace_model,("done, %s\n", ppc_function_unit_name[busy->unit]));
+       TRACE(trace_model,("done, %s, %d writeback%s\n", ppc_function_unit_name[busy->unit],
+                          busy->nr_writebacks, busy->nr_writebacks == 1 ? "" : "s"));
        if (busy->int_busy) {
          for(i = 0; i < 32; i++) {
            if (((1 << i) & busy->int_busy) != 0) {
@@ -357,45 +365,61 @@ void::model-static::model_trace_busy_p:model_data *model_ptr, unsigned32 int_bus
 \f
 # Advance state to next cycle, releasing any registers allocated
 void::model-internal::model_new_cycle:model_data *model_ptr
-       model_busy *cur_busy  = model_ptr->busy_list;
+       model_busy *cur_busy  = model_ptr->busy_head.next;
        model_busy *free_list = model_ptr->free_list;
-       model_busy *next_busy = (model_busy *)0;
+       model_busy *busy_tail = &model_ptr->busy_head;
+       int nr_writebacks     = model_ptr->max_nr_writebacks;
        model_busy *next;
 
        model_ptr->nr_cycles++;
+       TRACE(trace_model,("New cycle %lu\n", (unsigned long)model_ptr->nr_cycles));
        for ( ; cur_busy; cur_busy = next) {
          next = cur_busy->next;
-         if (--cur_busy->done <= 0) {          /* function unit done, release registers */
-           model_ptr->int_busy &= ~cur_busy->int_busy;
-           model_ptr->fp_busy &= ~cur_busy->fp_busy;
-           model_ptr->cr_fpscr_busy &= ~cur_busy->cr_fpscr_busy;
-           if (cur_busy->spr_busy != PPC_NO_SPR)
-             model_ptr->spr_busy[cur_busy->spr_busy] = 0;
-
-           if (WITH_TRACE && ppc_trace[trace_model])
-             model_trace_release(model_ptr, cur_busy);
-
-           model_ptr->busy[cur_busy->unit] = 0;
-           cur_busy->next = free_list;
-           free_list = cur_busy;
+         if (--cur_busy->done <= 0) {          /* function unit done, release registers if we have writeback slots */
+           nr_writebacks -= cur_busy->nr_writebacks;
+           if (nr_writebacks >= 0) {
+             model_ptr->int_busy &= ~cur_busy->int_busy;
+             model_ptr->fp_busy &= ~cur_busy->fp_busy;
+             model_ptr->cr_fpscr_busy &= ~cur_busy->cr_fpscr_busy;
+             if (cur_busy->spr_busy != PPC_NO_SPR)
+               model_ptr->spr_busy[cur_busy->spr_busy] = 0;
+
+             if (WITH_TRACE && ppc_trace[trace_model])
+               model_trace_release(model_ptr, cur_busy);
+
+             model_ptr->busy[cur_busy->unit] = 0;
+             cur_busy->next = free_list;
+             free_list = cur_busy;
+           }
+           else {      /* writeback slots not available */
+             TRACE(trace_model,("%d writeback slot%s not available for %s\n",
+                                cur_busy->nr_writebacks,
+                                cur_busy->nr_writebacks == 1 ? " is" : "s are",
+                                ppc_function_unit_name[cur_busy->unit]));
+             cur_busy->done++;                 /* undo -- above */
+             model_ptr->nr_stalls_writeback++;
+             busy_tail->next = cur_busy;
+             busy_tail = cur_busy;
+           }
          }
          else if (--cur_busy->issue <= 0) {    /* function unit pipelined, allow new use */
            TRACE(trace_model,("pipeline, %s ready for next client\n", ppc_function_unit_name[cur_busy->unit]));
            model_ptr->busy[cur_busy->unit] = 0;
-           cur_busy->next = next_busy;
-           next_busy = cur_busy;
+           busy_tail->next = cur_busy;
+           busy_tail = cur_busy;
          }
          else {
            TRACE(trace_model,("%s still working, issue = %d, done = %d\n",
                               ppc_function_unit_name[cur_busy->unit],
                               cur_busy->issue,
                               cur_busy->done));
-           cur_busy->next = next_busy;
-           next_busy = cur_busy;
+           busy_tail->next = cur_busy;
+           busy_tail = cur_busy;
          }
        }
 
-       model_ptr->busy_list = next_busy;
+       busy_tail->next = (model_busy *)0;
+       model_ptr->busy_tail = busy_tail;
        model_ptr->free_list = free_list;
 
 # Mark a function unit as busy, return the busy structure
@@ -410,16 +434,19 @@ model_busy *::model-internal::model_make_busy:model_data *model_ptr, ppc_functio
        else {
          busy = model_ptr->free_list;
          model_ptr->free_list = busy->next;
+         busy->next = (model_busy *)0;
+         busy->int_busy = 0;
+         busy->fp_busy = 0;
+         busy->cr_fpscr_busy = 0;
+         busy->nr_writebacks = 0;
        }
-       busy->next = model_ptr->busy_list;
+
        busy->unit = unit;
        busy->issue = issue;
        busy->done = done;
-       busy->int_busy = 0;
-       busy->fp_busy = 0;
-       busy->cr_fpscr_busy = 0;
        busy->spr_busy = PPC_NO_SPR;
-       model_ptr->busy_list = busy;
+       model_ptr->busy_tail->next = busy;
+       model_ptr->busy_tail = busy;
        model_ptr->busy[unit] = 1;
        model_ptr->nr_units[unit]++;
        return busy;
@@ -449,7 +476,7 @@ model_busy *::model-internal::model_wait_for_unit:itable_index index, model_data
 
 # Serialize the processor, waiting for all instructions to drain out before adding an instruction.
 void::model-function::model_serialize:itable_index index, model_data *model_ptr
-       while (model_ptr->busy_list) {
+       while (model_ptr->busy_head.next) {
          TRACE(trace_model,("waiting for pipeline to empty\n"));
          model_ptr->nr_stalls_serialize++;
          model_new_cycle(model_ptr);
@@ -494,10 +521,13 @@ void::model-function::ppc_insn_int:itable_index index, model_data *model_ptr, co
        busy_ptr = model_wait_for_unit(index, model_ptr, &model_ptr->timing[index]);
        model_ptr->int_busy |= out_mask;
        busy_ptr->int_busy |= out_mask;
+       if (out_mask)
+         busy_ptr->nr_writebacks = (PPC_ONE_BIT_SET_P(out_mask)) ? 1 : 2;
+
        if (WITH_TRACE && ppc_trace[trace_model])
          model_trace_make_busy(model_ptr, out_mask, 0, 0);
 
-# Schedule an instruction that takes integer input registers and produces output registers & sets some CR registers
+# Schedule an instruction that takes integer input registers and produces output registers & sets a CR register
 void::model-function::ppc_insn_int_cr:itable_index index, model_data *model_ptr, const unsigned32 out_mask, const unsigned32 in_mask, const unsigned32 cr_mask
        const unsigned32 int_mask = out_mask | in_mask;
        model_busy *busy_ptr;
@@ -519,6 +549,12 @@ void::model-function::ppc_insn_int_cr:itable_index index, model_data *model_ptr,
        busy_ptr->int_busy |= out_mask;
        model_ptr->cr_fpscr_busy |= cr_mask;
        busy_ptr->cr_fpscr_busy |= cr_mask;
+       if (out_mask)
+         busy_ptr->nr_writebacks = (PPC_ONE_BIT_SET_P(out_mask)) ? 1 : 2;
+
+       if (cr_mask)
+         busy_ptr->nr_writebacks++;
+
        if (WITH_TRACE && ppc_trace[trace_model])
          model_trace_make_busy(model_ptr, out_mask, 0, cr_mask);
 
@@ -543,11 +579,14 @@ void::model-function::ppc_insn_cr:itable_index index, model_data *model_ptr, con
        busy_ptr = model_wait_for_unit(index, model_ptr, &model_ptr->timing[index]);
        model_ptr->cr_fpscr_busy |= out_mask;
        busy_ptr->cr_fpscr_busy |= out_mask;
+       if (out_mask)
+         busy_ptr->nr_writebacks = 1;
+
        if (WITH_TRACE && ppc_trace[trace_model])
          model_trace_make_busy(model_ptr, 0, 0, out_mask);
 
 
-# Schedule an instruction that takes floating point input registers and produces output fp registers
+# Schedule an instruction that takes floating point input registers and produces an output fp register
 void::model-function::ppc_insn_float:itable_index index, model_data *model_ptr, const unsigned32 out_mask, const unsigned32 in_mask
        const unsigned32 fp_mask = out_mask | in_mask;
        model_busy *busy_ptr;
@@ -567,11 +606,12 @@ void::model-function::ppc_insn_float:itable_index index, model_data *model_ptr,
        busy_ptr = model_wait_for_unit(index, model_ptr, &model_ptr->timing[index]);
        model_ptr->fp_busy |= out_mask;
        busy_ptr->fp_busy |= out_mask;
+       busy_ptr->nr_writebacks = 1;
        if (WITH_TRACE && ppc_trace[trace_model])
          model_trace_make_busy(model_ptr, 0, out_mask, 0);
 
 
-# Schedule an instruction that takes floating point input registers and produces output fp registers & sets some CR regs
+# Schedule an instruction that takes floating point input registers and produces an output fp register & sets a CR reg
 void::model-function::ppc_insn_float_cr:itable_index index, model_data *model_ptr, const unsigned32 out_mask, const unsigned32 in_mask, const unsigned32 cr_mask
        const unsigned32 fp_mask = out_mask | in_mask;
        model_busy *busy_ptr;
@@ -593,6 +633,7 @@ void::model-function::ppc_insn_float_cr:itable_index index, model_data *model_pt
        busy_ptr->fp_busy |= out_mask;
        model_ptr->cr_fpscr_busy |= cr_mask;
        busy_ptr->cr_fpscr_busy |= cr_mask;
+       busy_ptr->nr_writebacks = (cr_mask) ? 2 : 1;
        if (WITH_TRACE && ppc_trace[trace_model])
          model_trace_make_busy(model_ptr, 0, out_mask, cr_mask);
 
@@ -619,6 +660,7 @@ void::model-function::ppc_insn_int_float:itable_index index, model_data *model_p
          busy_ptr->int_busy |= out_int_mask;
          model_ptr->fp_busy |= out_fp_mask;
          busy_ptr->fp_busy |= out_fp_mask;
+         busy_ptr->nr_writebacks = ((out_int_mask) ? 1 : 0) + ((out_fp_mask) ? 1 : 0);
          if (WITH_TRACE && ppc_trace[trace_model])
            model_trace_make_busy(model_ptr, out_int_mask, out_fp_mask, 0);
          return;
@@ -639,6 +681,7 @@ void::model-function::ppc_insn_from_spr:itable_index index, model_data *model_pt
        busy_ptr = model_wait_for_unit(index, model_ptr, &model_ptr->timing[index]);
        model_ptr->int_busy |= int_mask;
        busy_ptr->int_busy |= int_mask;
+       busy_ptr->nr_writebacks = 1;
        if (WITH_TRACE && ppc_trace[trace_model])
          model_trace_make_busy(model_ptr, int_mask, 0, 0);
 
@@ -657,6 +700,7 @@ void::model-function::ppc_insn_to_spr:itable_index index, model_data *model_ptr,
        busy_ptr = model_wait_for_unit(index, model_ptr, &model_ptr->timing[index]);
        busy_ptr->spr_busy = nSPR;
        model_ptr->spr_busy[nSPR] = 1;
+       busy_ptr->nr_writebacks = 1;
        TRACE(trace_model,("Making register %s busy.\n", spr_name(nSPR)));
 
 # Schedule a MFCR instruction that moves the CR into an integer regsiter
@@ -675,6 +719,7 @@ void::model-function::ppc_insn_mfcr:itable_index index, model_data *model_ptr, u
        busy_ptr = model_wait_for_unit(index, model_ptr, &model_ptr->timing[index]);
        model_ptr->int_busy |= int_mask;
        busy_ptr->int_busy |= int_mask;
+       busy_ptr->nr_writebacks = 1;
        if (WITH_TRACE && ppc_trace[trace_model])
          model_trace_make_busy(model_ptr, int_mask, 0, 0);
 
@@ -711,23 +756,31 @@ void::model-function::ppc_insn_mtcr:itable_index index, model_data *model_ptr, u
        busy_ptr->cr_fpscr_busy |= cr_mask;
        model_ptr->cr_fpscr_busy |= cr_mask;
        model_ptr->nr_mtcrf_crs[nr_crs]++;
+       busy_ptr->nr_writebacks = 1;
        if (WITH_TRACE && ppc_trace[trace_model])
          model_trace_make_busy(model_ptr, 0, 0, cr_mask);
 \f
 model_data *::model-function::model_create:cpu *processor
        model_data *model_ptr = ZALLOC(model_data);
-       ASSERT(CURRENT_MODEL > 0 && CURRENT_MODEL < nr_models);
        model_ptr->name = model_name[CURRENT_MODEL];
        model_ptr->timing = model_time_mapping[CURRENT_MODEL];
        model_ptr->processor = processor;
        model_ptr->nr_cycles = 1;
+       model_ptr->busy_tail = &model_ptr->busy_head;
+       switch (CURRENT_MODEL) {
+       case MODEL_ppc601:  model_ptr->max_nr_writebacks = 1; break;    /* ??? */
+       case MODEL_ppc603:  model_ptr->max_nr_writebacks = 2; break;
+       case MODEL_ppc603e: model_ptr->max_nr_writebacks = 2; break;
+       case MODEL_ppc604:  model_ptr->max_nr_writebacks = 2; break;
+       default: error ("Unknown model %d\n", CURRENT_MODEL);
+       }
        return model_ptr;
 
 void::model-function::model_init:model_data *model_ptr
 
 void::model-function::model_halt:model_data *model_ptr
        /* Let pipeline drain */
-       while (model_ptr->busy_list)
+       while (model_ptr->busy_head.next)
          model_new_cycle(model_ptr);
 
 model_print *::model-function::model_mon_info:model_data *model_ptr
@@ -770,6 +823,15 @@ model_print *::model-function::model_mon_info:model_data *model_ptr
          tail->suffix_singular = " waiting for serialization";
        }
 
+       if (model_ptr->nr_stalls_writeback) {
+         tail->next = ZALLOC(model_print);
+         tail = tail->next;
+         tail->count = model_ptr->nr_stalls_writeback;
+         tail->name = "";
+         tail->suffix_plural = "times a writeback slot was unavilable";
+         tail->suffix_singular = "time a writeback was unavilable";
+       }
+
        if (model_ptr->nr_branches) {
          tail->next = ZALLOC(model_print);
          tail = tail->next;
@@ -1357,7 +1419,7 @@ void::function::invalid_arithemetic_operation:cpu *processor, unsigned_word cia,
        if (AA) NIA = IEA(EXTS(LI_0b00));
        else    NIA = IEA(CIA + EXTS(LI_0b00));
        if (LK) LR = (spreg)CIA+4;
-       if (WITH_MODEL_ISSUE)
+       if (CURRENT_MODEL_ISSUE > 0)
          model_branches(cpu_model(processor), 1, -1);
 
 0.16,6.BO,11.BI,16.BD,30.AA,31.LK:B:t::Branch Conditional
@@ -1366,7 +1428,7 @@ void::function::invalid_arithemetic_operation:cpu *processor, unsigned_word cia,
 *603e:PPC_UNIT_BPU,   PPC_UNIT_BPU,   1,  1,  0
 *604: PPC_UNIT_BPU,   PPC_UNIT_BPU,   1,  1,  0
        int M, ctr_ok, cond_ok, succeed;
-       if (WITH_MODEL_ISSUE && ! BO{0})
+       if (CURRENT_MODEL_ISSUE > 0 && ! BO{0})
          model_wait_for_cr(cpu_model(processor), BIT32_BI);
        if (is_64bit_implementation && is_64bit_mode) M = 0;
        else                                          M = 32;
@@ -1381,7 +1443,7 @@ void::function::invalid_arithemetic_operation:cpu *processor, unsigned_word cia,
        else
          succeed = 0;
        if (LK) LR = (spreg)IEA(CIA + 4);
-       if (WITH_MODEL_ISSUE)
+       if (CURRENT_MODEL_ISSUE > 0)
          model_branches(cpu_model(processor), succeed, BO);
        if (! BO{0}) {
          int reverse;
@@ -1390,7 +1452,7 @@ void::function::invalid_arithemetic_operation:cpu *processor, unsigned_word cia,
          } else {      /* branch prediction bit not set */
            reverse = EXTS(BD_0b00) >= 0;
          }
-         if (WITH_MODEL_ISSUE)
+         if (CURRENT_MODEL_ISSUE > 0)
            model_branch_predict(cpu_model(processor), reverse ? !succeed : succeed);
        }
 
@@ -1402,7 +1464,7 @@ void::function::invalid_arithemetic_operation:cpu *processor, unsigned_word cia,
        int M, ctr_ok, cond_ok, succeed;
        if (is_64bit_implementation && is_64bit_mode) M = 0;
        else                                          M = 32;
-       if (WITH_MODEL_ISSUE && ! BO{0})
+       if (CURRENT_MODEL_ISSUE > 0 && ! BO{0})
          model_wait_for_cr(cpu_model(processor), BIT32_BI);
        if (!BO{2}) CTR = CTR - 1;
        ctr_ok = BO{2} || ((MASKED(CTR, M, 63) != 0) != BO{3});
@@ -1414,7 +1476,7 @@ void::function::invalid_arithemetic_operation:cpu *processor, unsigned_word cia,
        else
          succeed = 0;
        if (LK) LR = (spreg)IEA(CIA + 4);
-       if (WITH_MODEL_ISSUE) {
+       if (CURRENT_MODEL_ISSUE > 0) {
          model_branches(cpu_model(processor), succeed, BO);
          if (! BO{0})
            model_branch_predict(cpu_model(processor), BO{4} ? !succeed : succeed);
@@ -1426,7 +1488,7 @@ void::function::invalid_arithemetic_operation:cpu *processor, unsigned_word cia,
 *603e:PPC_UNIT_BPU,   PPC_UNIT_BPU,   1,  1,  0
 *604: PPC_UNIT_BPU,   PPC_UNIT_BPU,   1,  1,  0
        int cond_ok, succeed;
-       if (WITH_MODEL_ISSUE && ! BO{0})
+       if (CURRENT_MODEL_ISSUE > 0 && ! BO{0})
          model_wait_for_cr(cpu_model(processor), BIT32_BI);
        cond_ok = BO{0} || (CR{BI} == BO{1});
        if (cond_ok) {
@@ -1436,7 +1498,7 @@ void::function::invalid_arithemetic_operation:cpu *processor, unsigned_word cia,
        else
          succeed = 0;
        if (LK) LR = (spreg)IEA(CIA + 4);
-       if (WITH_MODEL_ISSUE) {
+       if (CURRENT_MODEL_ISSUE > 0) {
          model_branches(cpu_model(processor), succeed, BO);
          if (! BO{0})
            model_branch_predict(cpu_model(processor), BO{4} ? !succeed : succeed);
@@ -1450,7 +1512,7 @@ void::function::invalid_arithemetic_operation:cpu *processor, unsigned_word cia,
 *603: PPC_UNIT_SRU,   PPC_UNIT_SRU,   3,  3,  0
 *603e:PPC_UNIT_SRU,   PPC_UNIT_SRU,   3,  3,  0
 *604: PPC_UNIT_SCIU1, PPC_UNIT_SCIU2, 1,  1,  0
-       if (WITH_MODEL_ISSUE)
+       if (CURRENT_MODEL_ISSUE > 0)
          model_serialize(my_index, cpu_model(processor));
        system_call_interrupt(processor, cia);
 

diff --git a/sim/ppc/psim.c b/sim/ppc/psim.c
index 636ae05..e12556c 100644 (file)
--- a/sim/ppc/psim.c
+++ b/sim/ppc/psim.c
@@ -97,6 +97,7 @@ int current_host_byte_order;
 int current_environment;
 int current_alignment;
 int current_floating_point;
+int current_model_issue = MODEL_ISSUE_IGNORE;
 model_enum current_model = WITH_DEFAULT_MODEL;
 
 

diff --git a/sim/ppc/sim_calls.c b/sim/ppc/sim_calls.c
index c59d3e1..c2cef9a 100644 (file)
--- a/sim/ppc/sim_calls.c
+++ b/sim/ppc/sim_calls.c
@@ -106,6 +106,7 @@ sim_open (char *args)
            print_info = 1;
            break;
          case 'I':
+           current_model_issue = MODEL_ISSUE_PROCESS;
            print_info = 2;
            break;
          }
@@ -341,7 +342,7 @@ zalloc(long size)
   void *memory = (void*)xmalloc(size);
   if (memory == NULL)
     error("xmalloc failed\n");
-  bzero(memory, size);
+  memset(memory, 0, size);
   return memory;
 }
 

diff --git a/sim/ppc/std-config.h b/sim/ppc/std-config.h
index e1b308c..86214c0 100644 (file)
--- a/sim/ppc/std-config.h
+++ b/sim/ppc/std-config.h
@@ -275,10 +275,18 @@ extern int current_floating_point;
 #define WITH_DEFAULT_MODEL             DEFAULT_MODEL
 #endif
 
+#define MODEL_ISSUE_IGNORE             (-1)
+#define MODEL_ISSUE_PROCESS            1
+
 #ifndef WITH_MODEL_ISSUE
-#define WITH_MODEL_ISSUE               1
+#define WITH_MODEL_ISSUE               0
 #endif
 
+extern int current_model_issue;
+#define CURRENT_MODEL_ISSUE (WITH_MODEL_ISSUE  \
+                            ? WITH_MODEL_ISSUE \
+                            : current_model_issue)
+
 /* INLINE CODE SELECTION:
 
    GCC -O3 attempts to inline any function or procedure in scope.  The