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1.1 root 1: The following was a change log of the CCI "tahoe" porting.
2:
3:
4: 04/27 Rewrote fixmask.c to properly preserve r6 and r7. This method used should
5: have been used for the Vax; as it was, one had to count the number of register
6: variables declared in a function, and fixmask rebuilt the savemask from
7: scratch. This was a little bit kludgey; the new version simply OR's in
8: the two registers into the mask.
9:
10: 04/29 Replaced assembly version of exarith() with exarith.c from the 68k port,
11: with the call to emul() replaced my an asm(). Still slower than original vax.
12:
13: 05/02 Repaired fixpbig.e, the sed(1) script that replaces certain function
14: calls with inline code and fast subroutine calls (the vax "jsb"), as well
15: as changing all references to "np" and "lbot" to r6 and r7. The fast calls
16: are gone, because the tahoe isn't capable of such things. The rest were
17: changed to reflect different calling strategies.
18:
19: 08/29 Added an "#ifdef tahoe" to alloc.c which uses the original "ftstbit"
20: and "setbit" macros included in the source. The vax version uses asm()'s,
21: but I don't know the instruction set of the tahoe well enough to improve
22: on the macros' code.
23:
24: 09/04-09/08 Replaced more functions from bigmath.c with C versions from the
25: 68k port. ediv() and emul() calls were replaced with more asm's. Others were
26: moved into their own source files and used as they were.
27:
28: 09/10 Replaced Pushframe() and Iretfromfr(). The original Pushframe depended
29: on being called by a jsb. The new version makes the best of what it can
30: get from the standard call frame, and changes it around to match what's needed
31: (as specified in frame.h). Iretfromfr() was moved from frame.c, and had
32: asm's added to replace the qfunction it called. This basically just undoes
33: Pushframe().
34:
35: 09/10 GOT RAWLISP RUNNING! Version as of this afternoon would print a banner
36: and allow one to eval a few S-expressions. Problems seem to include: stringing
37: back through the stack frames, ediv reserved opperands, who knows what else.
38:
39: 09/18 Ediv requires that all of its arguments be registers. (Except for the
40: divisor, I think.) Very poorly documented. (as(1) doesn't compain. adb(1)
41: disassembles it properly. The architecture manual gives no indication of this.)
42: Now one can type numbers into the reader without getting a core dump, and
43: even do simple fixnum arithmetic.
44:
45: 09/18 Due to a typo Iretfromfr() was putting the old value of fp into r12
46: and not restoring fp at all. I don't yet know what problems this was causing.
47:
48: 09/18 /lib/c2 is optimizing away the "fixpbig.e" substitution of
49: calls to sp() ==> "movl sp,d0". Since "sp" is not a valid second
50: argument to subl3 (again no assembler complaints), another illegal instruction
51: core dump occurrs. Fixed by replacing "movl sp,d0" with "moval (sp),d0".
52:
53: 09/18 I can't figure out WHAT ediv's opperands are allowed to be. I'll
54: just fix those asm()'s until everyting works.
55:
56: 09/18 Bignum division problems:
57: ;; On a vax:
58: Franz Lisp, Opus 38.79
59: -> (quotient 999999999999 25)
60: 39999999999
61: ->
62: ;; On the tahoe:
63: Franz Lisp, Opus 38
64: -> (quotient 999999999999 25)
65: 198085033769738295431766579
66: ->
67:
68: 09/18 /lib/c2 was optimizing away another set of asm() constructs - in
69: this case the setting of r0 to the error frame location. "retfrom.s" is
70: the new, replaced version of Iretfromfr().
71:
72: 09/23 the ER% variables are not being correctly set to nil.
73: Cf. "sysat.c". Created raw.l to setq them, and discovered in
74: the process that semicolon hasn't got its readmacro properties
75: set up right. Flonums don't print correctly (always as ".0")
76: but seem to be capable of being added and comparred correctly.
77:
78: 09/24 Went through lots of code and found that the ER% variables
79: ARE being set correctly. The garbage collector, however, seems to be
80: trying to trash them and return them to the freelist, therefore their
81: value cells are being turned into freelist pointers. Removing the sweep
82: phase from gc1() seems to remove both this problem and the spontaneous
83: readtable disappearance. The 'ftstbit' and 'setbit' macros are suspected
84: as being the culprits.
85:
86: 09/24 Still suspecting something about the marking phase of gc1(). The
87: dumps looked awfully suspicious.
88:
89: 09/25 The marking phase, and in particular the bitset macros, were probably
90: indeed at fault. The macros used the ordinary Motorola-type non-reversed
91: byte order, while the code that read the bitmaps had been rewritten since
92: they had, and used the Vax reversed byte order. Rewrote the macros to
93: no longer use bytes.
94:
95: 09/25 Created "snlisp", the totally interpreted version of Franz. Works
96: fine except for the previously known bignum division bug and for cfasl'd
97: functions.
98:
99: 09/26 Fixed cfasl'd function error. callg_() was pushing its arglist
100: onto the stack in reverse order.
101:
102: 09/30 Reworked int:showstack, and added it to snlisp. A real mess (even
103: worse than it was before for the vax).
104:
105: 09/30 Fixed the bignum division bug. In mlsb() a function call was incorrectly
106: translated into an asm("ediv..."). This is the last known Franz bug as
107: of now.
108:
109: 10/23 RCS'd Liszt, and conditionalized it for the tahoe. Should work
110: identically as before, as a VAX cross-compiler. As a tahoe native compiler,
111: it still needs some work.
112:
113: 11/08 Discovered that a problem with Liszt was that fixnum subtractions were
114: not being done properly due to a ***SEVERELY BRAIN DAMAGED BROKEN EMUL
115: INSTRUCTION***. Turned faulty emul instructions into calls to emul()
116: which replaces the sign-extend-and-add functionality of the emul instruction
117: with a manual 64-bit add. Bignum divisions resulting in a negative number
118: were broken too.
119:
120: 11/10 Changed predecrement and postincrement modes in the compiler to make
121: up for the lack of same in the Tahoe instruction set.
122:
123: 11/13 ** Found that the emul instruction problem was present only in the old
124: WCS**. When the machine was rebooted this afternoon the problem went away.
125: Calls to emul() will be turned back into asm's.
126:
127: 11/14 Changed Lfasl() so that relocation of addresses works when an address
128: is not longword aligned. Also cleaned up the indentation.
129:
130: 11/16 Fixed Liszt and changed qlinker() to change the method of function
131: linkage, again because of alignment problems.
132:
133: 11/18 General repairs to fasl.c, and fixed a stupid quotemark typo (on my
134: part) in Liszt. Tried to port /usr/lib/lisp/autorun/tahoe.
135:
136: 12/5 Made various changes to liszt. Output works mostly most of the time,
137: but some things (read: nliszt) dump core.
138:
139: 12/8 Fixed liszt and qfuncl.c to remove shal instrucitons with negative
140: arguments, since these indescriminately mess up their opperands somehow.
141: Also changed subl2 in /usr/lib/lisp/autorun/tahoe with destination
142: sp, because subl2 doesn't seem to work on r14. r14 doesn't work as a source
143: opperand to movl either. Beats me why, I just fix 'em 'till they work.
144:
145: 12/11 Looking for a bug which causes nliszt to bomb on any functions with
146: more than one argument.
147:
148: 12/13 Above bug was caused by yet another missed postincrement instance.
149: Moved the postincrement handling around. Also ported code to handle &form
150: variable arguments.
151:
152: 12/14 Repaired code for (\\ x y)... compiled output did an ashq and an ediv
153: on an odd register.
154:
155: 12/16 Fixed a missed register save mask in one of the qfuncls. Added a missed
156: ".align" to the code that handles &forms.
157:
158: 12/17 Added r12 to qlinker's save mask. Added register mask for local functions
159: since they are now being called with calls's.
160:
161: 12/18 Added register save masks to local functions.
162:
163: 01/12 The _tynames table didn't have a necessary ".align 2" before it. This
164: was messing up compiled functions that called typep (causing align faults).
165:
166:
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