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      1 ChangeLog
      2 
      3 See the ChangeLog file looking for lines taged with the word FIXME.
      4 
      5 
      6 COREFILE.C:
      7 
      8 The implementation of corefile.c (defined by corefile.h) isn't the
      9 best.  It is intended to be functionaly correct rather than fast.  One
     10 option being considered is to add a data cache to reduce the overhead
     11 of the most common case of data read/writes.
     12 
     13 
     14 VEA:
     15 
     16 Missing VEA system calls.
     17 
     18 powerpc.igen:
     19 
     20 Missing or commented out instructions.
     21 
     22 
     23 64bit:
     24 
     25 64bit target untested. 64bit host broken.  For instance use of scanf
     26 "%x", &long long.
     27 
     28 
     29 
     30 hw_*.c:
     31 
     32 Better and more devices.
     33 
     34 PORTABILITY:
     35 
     36 (Notes taken from Michael Meissner): Heavy use of the ## operator -
     37 fix using the classic X/**/Y hack; Use of the signed keyword.  In
     38 particular, signed char has no analogue in classic C (though most
     39 implementations of classic C use signed chars); Use of long long which
     40 restricts the target compiler to be GCC.
     41 
     42 
     43 TRACING:
     44 
     45 debug.c: Macro's should be extended to include:
     46 
     47 	IS_*TRACE:	True if tracing enabled
     48 	*TRACE_PREFIX:	Outputs just the prefix line
     49 
     50 hw_trace.c: Flush, replace with a psim_set_tracing or some
     51 	such program.
     52 
     53 
     54 CIA/NIA:
     55 
     56 Replace with functions to return/increment the CIA?
     57 
     58 
     59 
     60 SMP & GDB:
     61 
     62 GDB doesn't understand SMP!
     63 
     64 
     65 
     66 
     67 OVERALL STRUCTURE:
     68 
     69 A new file pstruct.h is to be created that contains a single flat data
     70 structure containing:
     71 
     72 		pstruct {
     73 			events;
     74 			core;
     75 			processor[nr_cpus];
     76 			monitor;
     77 			devices;
     78 			trace;
     79 		}
     80 
     81 The CPU's structure, in turn would contain the VM sub structures.
     82 
     83 When SMP==0, everything would have PSTRUCT passed.  In SMP mode,
     84 however, there are two choices: PSTRUCT + CPU_NR or PROCESSOR.  I
     85 suspect the latter is better.
     86 
     87 It is believed that this would significantly improve performance (at
     88 the price of reduced control over object scope).
     89 
     90 
     91 
     92 
     93 IGEN:
     94 
     95 Igen at present can't do the following:
     96 
     97 	o	duplication is an all or nothing affair.
     98 
     99 		It should be configurable according to
    100 		the instruction or the sub-table.
    101 
    102 
    103 	o	Due to the naming, only a single generated
    104 		simulator can be included in a program.
    105 
    106 		IGEN should be able to generate multiple
    107 		engines that can all be included in a program
    108 
    109 	o	handle alternate architectures.
    110 
    111 
    112 	o	Igen should support the generation of a
    113 		disasembler and posibly an assembler.
    114 
    115 		I suggest that the table be extended to
    116 		include, for each instruction, additional
    117 		lines describing the extual format of the
    118 		instruction.
    119 
    120 		One possible format is:
    121 
    122 			"mtlr %RS":SPR.something
    123 			"mtspr %SPR, %RS"
    124