ref: a411870ee4640241e3c494367d922847da84f972
dir: purgatorio/appl/lib/dis.b
implement Dis;
#
# Derived by Vita Nuova Limited 1998 from /appl/wm/rt.b, which is
# Copyright © 1996-1999 Lucent Technologies Inc. All rights reserved.
#
include "sys.m";
sys: Sys;
sprint: import sys;
include "math.m";
math: Math;
include "dis.m";
disptr: int;
disobj: array of byte;
optab := array[] of {
"nop",
"alt",
"nbalt",
"goto",
"call",
"frame",
"spawn",
"runt",
"load",
"mcall",
"mspawn",
"mframe",
"ret",
"jmp",
"case",
"exit",
"new",
"newa",
"newcb",
"newcw",
"newcf",
"newcp",
"newcm",
"newcmp",
"send",
"recv",
"consb",
"consw",
"consp",
"consf",
"consm",
"consmp",
"headb",
"headw",
"headp",
"headf",
"headm",
"headmp",
"tail",
"lea",
"indx",
"movp",
"movm",
"movmp",
"movb",
"movw",
"movf",
"cvtbw",
"cvtwb",
"cvtfw",
"cvtwf",
"cvtca",
"cvtac",
"cvtwc",
"cvtcw",
"cvtfc",
"cvtcf",
"addb",
"addw",
"addf",
"subb",
"subw",
"subf",
"mulb",
"mulw",
"mulf",
"divb",
"divw",
"divf",
"modw",
"modb",
"andb",
"andw",
"orb",
"orw",
"xorb",
"xorw",
"shlb",
"shlw",
"shrb",
"shrw",
"insc",
"indc",
"addc",
"lenc",
"lena",
"lenl",
"beqb",
"bneb",
"bltb",
"bleb",
"bgtb",
"bgeb",
"beqw",
"bnew",
"bltw",
"blew",
"bgtw",
"bgew",
"beqf",
"bnef",
"bltf",
"blef",
"bgtf",
"bgef",
"beqc",
"bnec",
"bltc",
"blec",
"bgtc",
"bgec",
"slicea",
"slicela",
"slicec",
"indw",
"indf",
"indb",
"negf",
"movl",
"addl",
"subl",
"divl",
"modl",
"mull",
"andl",
"orl",
"xorl",
"shll",
"shrl",
"bnel",
"bltl",
"blel",
"bgtl",
"bgel",
"beql",
"cvtlf",
"cvtfl",
"cvtlw",
"cvtwl",
"cvtlc",
"cvtcl",
"headl",
"consl",
"newcl",
"casec",
"indl",
"movpc",
"tcmp",
"mnewz",
"cvtrf",
"cvtfr",
"cvtws",
"cvtsw",
"lsrw",
"lsrl",
"eclr",
"newz",
"newaz",
"raise",
"casel",
"mulx",
"divx",
"cvtxx",
"mulx0",
"divx0",
"cvtxx0",
"mulx1",
"divx1",
"cvtxx1",
"cvtfx",
"cvtxf",
"expw",
"expl",
"expf",
"self",
};
init()
{
sys = load Sys Sys->PATH;
math = load Math Math->PATH; # optional
}
loadobj(disfile: string): (ref Mod, string)
{
fd := sys->open(disfile, sys->OREAD);
if(fd == nil)
return (nil, "open failed: "+sprint("%r"));
(ok, d) := sys->fstat(fd);
if(ok < 0)
return (nil, "stat failed: "+sprint("%r"));
objlen := int d.length;
disobj = array[objlen] of byte;
if(sys->read(fd, disobj, objlen) != objlen){
disobj = nil;
return (nil, "read failed: "+sprint("%r"));
}
disptr = 0;
m := ref Mod;
m.magic = operand();
if(m.magic == SMAGIC) {
n := operand();
m.sign = disobj[disptr:disptr+n];
disptr += n;
m.magic = operand();
}
if(m.magic != XMAGIC){
disobj = nil;
return (nil, "bad magic number");
}
m.rt = operand();
m.ssize = operand();
m.isize = operand();
m.dsize = operand();
m.tsize = operand();
m.lsize = operand();
m.entry = operand();
m.entryt = operand();
m.inst = array[m.isize] of ref Inst;
for(i := 0; i < m.isize; i++) {
o := ref Inst;
o.op = int disobj[disptr++];
o.addr = int disobj[disptr++];
case o.addr & ARM {
AXIMM or
AXINF or
AXINM =>
o.mid = operand();
}
case (o.addr>>3) & 7 {
AFP or
AMP or
AIMM =>
o.src = operand();
AIND|AFP or
AIND|AMP =>
o.src = operand()<<16;
o.src |= operand();
}
case o.addr & 7 {
AFP or
AMP or
AIMM =>
o.dst = operand();
AIND|AFP or
AIND|AMP =>
o.dst = operand()<<16;
o.dst |= operand();
}
m.inst[i] = o;
}
m.types = array[m.tsize] of ref Type;
for(i = 0; i < m.tsize; i++) {
h := ref Type;
id := operand();
h.size = operand();
h.np = operand();
h.map = disobj[disptr:disptr+h.np];
disptr += h.np;
m.types[i] = h;
}
for(;;) {
op := int disobj[disptr++];
if(op == 0)
break;
n := op & (DMAX-1);
if(n == 0)
n = operand();
offset := operand();
dat: ref Data;
case op>>4 {
DEFB =>
dat = ref Data.Bytes(op, n, offset, disobj[disptr:disptr+n]);
disptr += n;
DEFW =>
words := array[n] of int;
for(i = 0; i < n; i++)
words[i] = getw();
dat = ref Data.Words(op, n, offset, words);
DEFS =>
dat = ref Data.String(op, n, offset, string disobj[disptr:disptr+n]);
disptr += n;
DEFF =>
if(math != nil){
reals := array[n] of real;
for(i = 0; i < n; i++)
reals[i] = math->bits64real(getl());
dat = ref Data.Reals(op, n, offset, reals);
} else {
disptr += 8*n; # skip it
dat = ref Data.Reals(op, n, offset, nil);
}
break;
DEFA =>
typex := getw();
length := getw();
dat = ref Data.Array(op, n, offset, typex, length);
DIND =>
dat = ref Data.Aindex(op, n, offset, getw());
DAPOP =>
dat = ref Data.Arestore(op, n, offset);
DEFL =>
bigs := array[n] of big;
for(i = 0; i < n; i++)
bigs[i] = getl();
dat = ref Data.Bigs(op, n, offset, bigs);
* =>
dat = ref Data.Zero(op, n, offset);
}
m.data = dat :: m.data;
}
m.data = revdat(m.data);
m.name = gets();
m.links = array[m.lsize] of ref Link;
for(i = 0; i < m.lsize; i++) {
l := ref Link;
l.pc = operand();
l.desc = operand();
l.sig = getw();
l.name = gets();
m.links[i] = l;
}
if(m.rt & Dis->HASLDT0)
raise "obsolete dis";
if(m.rt & Dis->HASLDT){
nl := operand();
imps := array[nl] of array of ref Import;
for(i = 0; i < nl; i++){
n := operand();
imps[i] = array[n] of ref Import;
for(j := 0; j < n; j++){
imps[i][j] = im := ref Import;
im.sig = getw();
im.name = gets();
}
}
disptr++;
m.imports = imps;
}
if(m.rt & Dis->HASEXCEPT){
nh := operand(); # number of handlers
hs := array[nh] of ref Handler;
for(i = 0; i < nh; i++){
h := hs[i] = ref Handler;
h.eoff = operand();
h.pc1 = operand();
h.pc2 = operand();
t := operand();
if(t >= 0)
h.t = m.types[t];
n := operand();
h.ne = n>>16;
n &= 16rffff; # number of cases
h.etab = array[n+1] of ref Except;
for(j := 0; j < n; j++){
e := h.etab[j] = ref Except;
k := disptr;
while(int disobj[disptr++]) # pattern
;
e.s = string disobj[k: disptr-1];
e.pc = operand();
}
e := h.etab[j] = ref Except;
e.pc = operand(); # * pc
}
disptr++; # 0 byte
m.handlers = hs;
}
m.srcpath = gets();
disobj = nil;
return (m, nil);
}
operand(): int
{
if(disptr >= len disobj)
return -1;
b := int disobj[disptr++];
case b & 16rC0 {
16r00 =>
return b;
16r40 =>
return b | ~16r7F;
16r80 =>
if(disptr >= len disobj)
return -1;
if(b & 16r20)
b |= ~16r3F;
else
b &= 16r3F;
return (b<<8) | int disobj[disptr++];
16rC0 =>
if(disptr+2 >= len disobj)
return -1;
if(b & 16r20)
b |= ~16r3F;
else
b &= 16r3F;
b = b<<24 |
(int disobj[disptr]<<16) |
(int disobj[disptr+1]<<8)|
int disobj[disptr+2];
disptr += 3;
return b;
}
return 0;
}
get4(a: array of byte, i: int): int
{
return (int a[i+0] << 24) | (int a[i+1] << 16) | (int a[i+2] << 8) | int a[i+3];
}
getw(): int
{
if(disptr+3 >= len disobj)
return -1;
i := (int disobj[disptr+0]<<24) |
(int disobj[disptr+1]<<16) |
(int disobj[disptr+2]<<8) |
int disobj[disptr+3];
disptr += 4;
return i;
}
getl(): big
{
if(disptr+7 >= len disobj)
return big -1;
i := (big disobj[disptr+0]<<56) |
(big disobj[disptr+1]<<48) |
(big disobj[disptr+2]<<40) |
(big disobj[disptr+3]<<32) |
(big disobj[disptr+4]<<24) |
(big disobj[disptr+5]<<16) |
(big disobj[disptr+6]<<8) |
big disobj[disptr+7];
disptr += 8;
return i;
}
gets(): string
{
s := disptr;
while(disptr < len disobj && disobj[disptr] != byte 0)
disptr++;
v := string disobj[s:disptr];
disptr++;
return v;
}
revdat(d: list of ref Data): list of ref Data
{
t: list of ref Data;
while(d != nil) {
t = hd d :: t;
d = tl d;
}
return t;
}
op2s(op: int): string
{
if(op < 0 || op >= len optab)
return sys->sprint("OP%d", op);
return optab[op];
}
inst2s(o: ref Inst): string
{
fi := 0;
si := 0;
s := sprint("%-10s", optab[o.op]);
src := "";
dst := "";
mid := "";
case (o.addr>>3) & 7 {
AFP =>
src = sprint("%d(fp)", o.src);
AMP =>
src = sprint("%d(mp)", o.src);
AIMM =>
src = sprint("$%d", o.src);
AIND|AFP =>
fi = (o.src>>16) & 16rFFFF;
si = o.src & 16rFFFF;
src = sprint("%d(%d(fp))", si, fi);
AIND|AMP =>
fi = (o.src>>16) & 16rFFFF;
si = o.src & 16rFFFF;
src = sprint("%d(%d(mp))", si, fi);
}
case o.addr & ARM {
AXIMM =>
mid = sprint("$%d", o.mid);
AXINF =>
mid = sprint("%d(fp)", o.mid);
AXINM =>
mid = sprint("%d(mp)", o.mid);
}
case o.addr & 7 {
AFP =>
dst = sprint("%d(fp)", o.dst);
AMP =>
dst = sprint("%d(mp)", o.dst);
AIMM =>
dst = sprint("$%d", o.dst);
AIND|AFP =>
fi = (o.dst>>16) & 16rFFFF;
si = o.dst & 16rFFFF;
dst = sprint("%d(%d(fp))", si, fi);
AIND|AMP =>
fi = (o.dst>>16) & 16rFFFF;
si = o.dst & 16rFFFF;
dst = sprint("%d(%d(mp))", si, fi);
}
if(mid == "") {
if(src == "")
s += sprint("%s", dst);
else if(dst == "")
s += sprint("%s", src);
else
s += sprint("%s, %s", src, dst);
}
else
s += sprint("%s, %s, %s", src, mid, dst);
return s;
}
getsb(fd: ref Sys->FD, o: int): (string, int)
{
b := array[1] of byte;
buf := array[8192] of byte;
p := len buf;
for( ; ; o++){
sys->seek(fd, big -o, Sys->SEEKEND);
if(sys->read(fd, b, 1) != 1)
return (nil, 0);
if(b[0] == byte 0){
if(p < len buf)
break;
}
else if(p > 0)
buf[--p] = b[0];
}
return (string buf[p: ], o);
}
src(disf: string): string
{
fd := sys->open(disf, sys->OREAD);
if(fd == nil)
return nil;
(s, nil) := getsb(fd, 1);
if(s != nil && s[0] == '/')
return s;
return nil;
}