#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mach.h>
static int debug = 0;
#define BITS(a, b) ((1<<(b+1))-(1<<a))
#define LSR(v, s) ((ulong)(v) >> (s))
#define ASR(v, s) ((long)(v) >> (s))
#define ROR(v, s) (LSR((v), (s)) | (((v) & ((1 << (s))-1)) << (32 - (s))))
typedef struct Instr Instr;
struct Instr
{
Map *map;
ulong w;
uvlong addr;
uchar op; /* super opcode */
uchar cond; /* bits 28-31 */
uchar store; /* bit 20 */
uchar rd; /* bits 12-15 */
uchar rn; /* bits 16-19 */
uchar rs; /* bits 0-11 (shifter operand) */
long imm; /* rotated imm */
char* curr; /* fill point in buffer */
char* end; /* end of buffer */
char* err; /* error message */
};
typedef struct Opcode Opcode;
struct Opcode
{
char* o;
void (*fmt)(Opcode*, Instr*);
uvlong (*foll)(Map*, Rgetter, Instr*, uvlong);
char* a;
};
static void format(char*, Instr*, char*);
static char FRAMENAME[] = ".frame";
/*
* Arm-specific debugger interface
*/
static char *armexcep(Map*, Rgetter);
static int armfoll(Map*, uvlong, Rgetter, uvlong*);
static int arminst(Map*, uvlong, char, char*, int);
static int armdas(Map*, uvlong, char*, int);
static int arminstlen(Map*, uvlong);
/*
* Debugger interface
*/
Machdata armmach =
{
{0, 0, 0, 0xD}, /* break point */
4, /* break point size */
leswab, /* short to local byte order */
leswal, /* long to local byte order */
leswav, /* long to local byte order */
risctrace, /* C traceback */
riscframe, /* Frame finder */
armexcep, /* print exception */
0, /* breakpoint fixup */
0, /* single precision float printer */
0, /* double precision float printer */
armfoll, /* following addresses */
arminst, /* print instruction */
armdas, /* dissembler */
arminstlen, /* instruction size */
};
static char*
armexcep(Map *map, Rgetter rget)
{
uvlong c;
c = (*rget)(map, "TYPE");
switch ((int)c&0x1f) {
case 0x11:
return "Fiq interrupt";
case 0x12:
return "Mirq interrupt";
case 0x13:
return "SVC/SWI Exception";
case 0x17:
return "Prefetch Abort/Data Abort";
case 0x18:
return "Data Abort";
case 0x1b:
return "Undefined instruction/Breakpoint";
case 0x1f:
return "Sys trap";
default:
return "Undefined trap";
}
}
static
char* cond[16] =
{
"EQ", "NE", "CS", "CC",
"MI", "PL", "VS", "VC",
"HI", "LS", "GE", "LT",
"GT", "LE", 0, "NV"
};
static
char* shtype[4] =
{
"<<", ">>", "->", "@>"
};
static
char *hb[4] =
{
"???", "HU", "B", "H"
};
static
char* addsub[2] =
{
"-", "+",
};
int
armclass(long w)
{
int op;
op = (w >> 25) & 0x7;
switch(op) {
case 0: /* data processing r,r,r */
op = ((w >> 4) & 0xf);
if(op == 0x9) {
op = 48+16; /* mul */
if(w & (1<<24)) {
op += 2;
if(w & (1<<22))
op++; /* swap */
break;
}
if(w & (1<<23)) { /* mullu */
op = (48+24+4+4+2+2+4);
if(w & (1<<22)) /* mull */
op += 2;
}
if(w & (1<<21))
op++; /* mla */
break;
}
if((op & 0x9) == 0x9) /* ld/st byte/half s/u */
{
op = (48+16+4) + ((w >> 22) & 0x1) + ((w >> 19) & 0x2);
break;
}
op = (w >> 21) & 0xf;
if(w & (1<<4))
op += 32;
else
if((w & (31<<7)) || (w & (1<<5)))
op += 16;
break;
case 1: /* data processing i,r,r */
op = (48) + ((w >> 21) & 0xf);
break;
case 2: /* load/store byte/word i(r) */
op = (48+24) + ((w >> 22) & 0x1) + ((w >> 19) & 0x2);
break;
case 3: /* load/store byte/word (r)(r) */
op = (48+24+4) + ((w >> 22) & 0x1) + ((w >> 19) & 0x2);
break;
case 4: /* block data transfer (r)(r) */
op = (48+24+4+4) + ((w >> 20) & 0x1);
break;
case 5: /* branch / branch link */
op = (48+24+4+4+2) + ((w >> 24) & 0x1);
break;
case 7: /* coprocessor crap */
op = (48+24+4+4+2+2) + ((w >> 3) & 0x2) + ((w >> 20) & 0x1);
break;
default:
op = (48+24+4+4+2+2+4+4);
break;
}
return op;
}
static int
decode(Map *map, uvlong pc, Instr *i)
{
ulong w;
if(get4(map, pc, &w) < 0) {
werrstr("can't read instruction: %r");
return -1;
}
i->w = w;
i->addr = pc;
i->cond = (w >> 28) & 0xF;
i->op = armclass(w);
i->map = map;
return 1;
}
#pragma varargck argpos bprint 2
static void
bprint(Instr *i, char *fmt, ...)
{
va_list arg;
va_start(arg, fmt);
i->curr = vseprint(i->curr, i->end, fmt, arg);
va_end(arg);
}
static int
plocal(Instr *i)
{
char *reg;
Symbol s;
char *fn;
int class;
int offset;
if(!findsym(i->addr, CTEXT, &s)) {
if(debug)fprint(2,"fn not found @%llux: %r\n", i->addr);
return 0;
}
fn = s.name;
if (!findlocal(&s, FRAMENAME, &s)) {
if(debug)fprint(2,"%s.%s not found @%s: %r\n", fn, FRAMENAME, s.name);
return 0;
}
if(s.value > i->imm) {
class = CAUTO;
offset = s.value-i->imm;
reg = "(SP)";
} else {
class = CPARAM;
offset = i->imm-s.value-4;
reg = "(FP)";
}
if(!getauto(&s, offset, class, &s)) {
if(debug)fprint(2,"%s %s not found @%ux: %r\n", fn,
class == CAUTO ? " auto" : "param", offset);
return 0;
}
bprint(i, "%s%c%lld%s", s.name, class == CPARAM ? '+' : '-', s.value, reg);
return 1;
}
/*
* Print value v as name[+offset]
*/
static int
gsymoff(char *buf, int n, long v, int space)
{
Symbol s;
int r;
long delta;
r = delta = 0; /* to shut compiler up */
if (v) {
r = findsym(v, space, &s);
if (r)
delta = v-s.value;
if (delta < 0)
delta = -delta;
}
if (v == 0 || r == 0 || delta >= 4096)
return snprint(buf, n, "#%lux", v);
if (strcmp(s.name, ".string") == 0)
return snprint(buf, n, "#%lux", v);
if (!delta)
return snprint(buf, n, "%s", s.name);
if (s.type != 't' && s.type != 'T')
return snprint(buf, n, "%s+%llux", s.name, v-s.value);
else
return snprint(buf, n, "#%lux", v);
}
static void
armdps(Opcode *o, Instr *i)
{
i->store = (i->w >> 20) & 1;
i->rn = (i->w >> 16) & 0xf;
i->rd = (i->w >> 12) & 0xf;
i->rs = (i->w >> 0) & 0xf;
if(i->rn == 15 && i->rs == 0) {
if(i->op == 8) {
format("MOVW", i,"CPSR, R%d");
return;
} else
if(i->op == 10) {
format("MOVW", i,"SPSR, R%d");
return;
}
} else
if(i->rn == 9 && i->rd == 15) {
if(i->op == 9) {
format("MOVW", i, "R%s, CPSR");
return;
} else
if(i->op == 11) {
format("MOVW", i, "R%s, SPSR");
return;
}
}
format(o->o, i, o->a);
}
static void
armdpi(Opcode *o, Instr *i)
{
ulong v;
int c;
v = (i->w >> 0) & 0xff;
c = (i->w >> 8) & 0xf;
while(c) {
v = (v<<30) | (v>>2);
c--;
}
i->imm = v;
i->store = (i->w >> 20) & 1;
i->rn = (i->w >> 16) & 0xf;
i->rd = (i->w >> 12) & 0xf;
i->rs = i->w&0x0f;
/* RET is encoded as ADD #0,R14,R15 */
if((i->w & 0x0fffffff) == 0x028ef000){
format("RET%C", i, "");
return;
}
if((i->w & 0x0ff0ffff) == 0x0280f000){
format("B%C", i, "0(R%n)");
return;
}
format(o->o, i, o->a);
}
static void
armsdti(Opcode *o, Instr *i)
{
ulong v;
v = i->w & 0xfff;
if(!(i->w & (1<<23)))
v = -v;
i->store = ((i->w >> 23) & 0x2) | ((i->w >>21) & 0x1);
i->imm = v;
i->rn = (i->w >> 16) & 0xf;
i->rd = (i->w >> 12) & 0xf;
/* RET is encoded as LW.P x,R13,R15 */
if ((i->w & 0x0ffff000) == 0x049df000)
{
format("RET%C%p", i, "%I");
return;
}
format(o->o, i, o->a);
}
/* arm V4 ld/st halfword, signed byte */
static void
armhwby(Opcode *o, Instr *i)
{
i->store = ((i->w >> 23) & 0x2) | ((i->w >>21) & 0x1);
i->imm = (i->w & 0xf) | ((i->w >> 8) & 0xf);
if (!(i->w & (1 << 23)))
i->imm = - i->imm;
i->rn = (i->w >> 16) & 0xf;
i->rd = (i->w >> 12) & 0xf;
i->rs = (i->w >> 0) & 0xf;
format(o->o, i, o->a);
}
static void
armsdts(Opcode *o, Instr *i)
{
i->store = ((i->w >> 23) & 0x2) | ((i->w >>21) & 0x1);
i->rs = (i->w >> 0) & 0xf;
i->rn = (i->w >> 16) & 0xf;
i->rd = (i->w >> 12) & 0xf;
format(o->o, i, o->a);
}
static void
armbdt(Opcode *o, Instr *i)
{
i->store = (i->w >> 21) & 0x3; /* S & W bits */
i->rn = (i->w >> 16) & 0xf;
i->imm = i->w & 0xffff;
if(i->w == 0xe8fd8000)
format("RFE", i, "");
else
format(o->o, i, o->a);
}
static void
armund(Opcode *o, Instr *i)
{
format(o->o, i, o->a);
}
static void
armcdt(Opcode *o, Instr *i)
{
format(o->o, i, o->a);
}
static void
armunk(Opcode *o, Instr *i)
{
format(o->o, i, o->a);
}
static void
armb(Opcode *o, Instr *i)
{
ulong v;
v = i->w & 0xffffff;
if(v & 0x800000)
v |= ~0xffffff;
i->imm = (v<<2) + i->addr + 8;
format(o->o, i, o->a);
}
static void
armco(Opcode *o, Instr *i) /* coprocessor instructions */
{
int op, p, cp;
char buf[1024];
i->rn = (i->w >> 16) & 0xf;
i->rd = (i->w >> 12) & 0xf;
i->rs = i->w&0xf;
cp = (i->w >> 8) & 0xf;
p = (i->w >> 5) & 0x7;
if(i->w&(1<<4)) {
op = (i->w >> 21) & 0x07;
snprint(buf, sizeof(buf), "#%x, #%x, R%d, C(%d), C(%d), #%x\n", cp, op, i->rd, i->rn, i->rs, p);
} else {
op = (i->w >> 20) & 0x0f;
snprint(buf, sizeof(buf), "#%x, #%x, C(%d), C(%d), C(%d), #%x\n", cp, op, i->rd, i->rn, i->rs, p);
}
format(o->o, i, buf);
}
static int
armcondpass(Map *map, Rgetter rget, uchar cond)
{
uvlong psr;
uchar n;
uchar z;
uchar c;
uchar v;
psr = rget(map, "PSR");
n = (psr >> 31) & 1;
z = (psr >> 30) & 1;
c = (psr >> 29) & 1;
v = (psr >> 28) & 1;
switch(cond) {
case 0: return z;
case 1: return !z;
case 2: return c;
case 3: return !c;
case 4: return n;
case 5: return !n;
case 6: return v;
case 7: return !v;
case 8: return c && !z;
case 9: return !c || z;
case 10: return n == v;
case 11: return n != v;
case 12: return !z && (n == v);
case 13: return z && (n != v);
case 14: return 1;
case 15: return 0;
}
}
static ulong
armshiftval(Map *map, Rgetter rget, Instr *i)
{
if(i->w & (1 << 25)) { /* immediate */
ulong imm = i->w & BITS(0, 7);
ulong s = (i->w & BITS(8, 11)) >> 7; /* this contains the *2 */
return ROR(imm, s);
} else {
char buf[8];
ulong v;
ulong s = (i->w & BITS(7,11)) >> 7;
sprint(buf, "R%ld", i->w & 0xf);
v = rget(map, buf);
switch((i->w & BITS(4, 6)) >> 4) {
case 0: /* LSLIMM */
return v << s;
case 1: /* LSLREG */
sprint(buf, "R%lud", s >> 1);
s = rget(map, buf) & 0xFF;
if(s >= 32) return 0;
return v << s;
case 2: /* LSRIMM */
return LSR(v, s);
case 3: /* LSRREG */
sprint(buf, "R%ld", s >> 1);
s = rget(map, buf) & 0xFF;
if(s >= 32) return 0;
return LSR(v, s);
case 4: /* ASRIMM */
if(s == 0) {
if((v & (1U<<31)) == 0)
return 0;
return 0xFFFFFFFF;
}
return ASR(v, s);
case 5: /* ASRREG */
sprint(buf, "R%ld", s >> 1);
s = rget(map, buf) & 0xFF;
if(s >= 32) {
if((v & (1U<<31)) == 0)
return 0;
return 0xFFFFFFFF;
}
return ASR(v, s);
case 6: /* RORIMM */
if(s == 0) {
ulong c = (rget(map, "PSR") >> 29) & 1;
return (c << 31) | LSR(v, 1);
}
return ROR(v, s);
case 7: /* RORREG */
sprint(buf, "R%ld", (s>>1)&0xF);
s = rget(map, buf);
if(s == 0 || (s & 0xF) == 0)
return v;
return ROR(v, s & 0xF);
}
}
}
static int
nbits(ulong v)
{
int n = 0;
int i;
for(i=0; i < 32 ; i++) {
if(v & 1) ++n;
v >>= 1;
}
return n;
}
static ulong
armmaddr(Map *map, Rgetter rget, Instr *i)
{
ulong v;
ulong nb;
char buf[8];
ulong rn;
rn = (i->w >> 16) & 0xf;
sprint(buf,"R%ld", rn);
v = rget(map, buf);
nb = nbits(i->w & ((1 << 15) - 1));
switch((i->w >> 23) & 3) {
case 0: return (v - (nb*4)) + 4;
case 1: return v;
case 2: return v - (nb*4);
case 3: return v + 4;
}
}
static uvlong
armaddr(Map *map, Rgetter rget, Instr *i)
{
char buf[8];
ulong rn;
sprint(buf, "R%ld", (i->w >> 16) & 0xf);
rn = rget(map, buf);
if((i->w & (1<<24)) == 0) { /* POSTIDX */
sprint(buf, "R%ld", rn);
return rget(map, buf);
}
if((i->w & (1<<25)) == 0) { /* OFFSET */
sprint(buf, "R%ld", rn);
if(i->w & (1U<<23))
return rget(map, buf) + (i->w & BITS(0,11));
return rget(map, buf) - (i->w & BITS(0,11));
} else { /* REGOFF */
ulong index = 0;
uchar c;
uchar rm;
sprint(buf, "R%ld", i->w & 0xf);
rm = rget(map, buf);
switch((i->w & BITS(5,6)) >> 5) {
case 0: index = rm << ((i->w & BITS(7,11)) >> 7); break;
case 1: index = LSR(rm, ((i->w & BITS(7,11)) >> 7)); break;
case 2: index = ASR(rm, ((i->w & BITS(7,11)) >> 7)); break;
case 3:
if((i->w & BITS(7,11)) == 0) {
c = (rget(map, "PSR") >> 29) & 1;
index = c << 31 | LSR(rm, 1);
} else {
index = ROR(rm, ((i->w & BITS(7,11)) >> 7));
}
break;
}
if(i->w & (1<<23))
return rn + index;
return rn - index;
}
}
static uvlong
armfadd(Map *map, Rgetter rget, Instr *i, uvlong pc)
{
char buf[8];
int r;
r = (i->w >> 12) & 0xf;
if(r != 15 || !armcondpass(map, rget, (i->w >> 28) & 0xf))
return pc+4;
r = (i->w >> 16) & 0xf;
sprint(buf, "R%d", r);
return rget(map, buf) + armshiftval(map, rget, i);
}
static uvlong
armfmovm(Map *map, Rgetter rget, Instr *i, uvlong pc)
{
ulong v;
ulong addr;
v = i->w & 1<<15;
if(!v || !armcondpass(map, rget, (i->w>>28)&0xf))
return pc+4;
addr = armmaddr(map, rget, i) + nbits(i->w & BITS(0,15));
if(get4(map, addr, &v) < 0) {
werrstr("can't read addr: %r");
return -1;
}
return v;
}
static uvlong
armfbranch(Map *map, Rgetter rget, Instr *i, uvlong pc)
{
if(!armcondpass(map, rget, (i->w >> 28) & 0xf))
return pc+4;
return pc + (((signed long)i->w << 8) >> 6) + 8;
}
static uvlong
armfmov(Map *map, Rgetter rget, Instr *i, uvlong pc)
{
ulong rd, v;
rd = (i->w >> 12) & 0xf;
if(rd != 15 || !armcondpass(map, rget, (i->w>>28)&0xf))
return pc+4;
/* LDR */
/* BUG: Needs LDH/B, too */
if((i->w>>26)&0x3 == 1) {
if(get4(map, armaddr(map, rget, i), &v) < 0) {
werrstr("can't read instruction: %r");
return pc+4;
}
return v;
}
/* MOV */
v = armshiftval(map, rget, i);
return v;
}
static Opcode opcodes[] =
{
"AND%C%S", armdps, 0, "R%s,R%n,R%d",
"EOR%C%S", armdps, 0, "R%s,R%n,R%d",
"SUB%C%S", armdps, 0, "R%s,R%n,R%d",
"RSB%C%S", armdps, 0, "R%s,R%n,R%d",
"ADD%C%S", armdps, armfadd, "R%s,R%n,R%d",
"ADC%C%S", armdps, 0, "R%s,R%n,R%d",
"SBC%C%S", armdps, 0, "R%s,R%n,R%d",
"RSC%C%S", armdps, 0, "R%s,R%n,R%d",
"TST%C%S", armdps, 0, "R%s,R%n",
"TEQ%C%S", armdps, 0, "R%s,R%n",
"CMP%C%S", armdps, 0, "R%s,R%n",
"CMN%C%S", armdps, 0, "R%s,R%n",
"ORR%C%S", armdps, 0, "R%s,R%n,R%d",
"MOVW%C%S", armdps, armfmov, "R%s,R%d",
"BIC%C%S", armdps, 0, "R%s,R%n,R%d",
"MVN%C%S", armdps, 0, "R%s,R%d",
/* 16 */
"AND%C%S", armdps, 0, "(R%s%h%m),R%n,R%d",
"EOR%C%S", armdps, 0, "(R%s%h%m),R%n,R%d",
"SUB%C%S", armdps, 0, "(R%s%h%m),R%n,R%d",
"RSB%C%S", armdps, 0, "(R%s%h%m),R%n,R%d",
"ADD%C%S", armdps, armfadd, "(R%s%h%m),R%n,R%d",
"ADC%C%S", armdps, 0, "(R%s%h%m),R%n,R%d",
"SBC%C%S", armdps, 0, "(R%s%h%m),R%n,R%d",
"RSC%C%S", armdps, 0, "(R%s%h%m),R%n,R%d",
"TST%C%S", armdps, 0, "(R%s%h%m),R%n",
"TEQ%C%S", armdps, 0, "(R%s%h%m),R%n",
"CMP%C%S", armdps, 0, "(R%s%h%m),R%n",
"CMN%C%S", armdps, 0, "(R%s%h%m),R%n",
"ORR%C%S", armdps, 0, "(R%s%h%m),R%n,R%d",
"MOVW%C%S", armdps, armfmov, "(R%s%h%m),R%d",
"BIC%C%S", armdps, 0, "(R%s%h%m),R%n,R%d",
"MVN%C%S", armdps, 0, "(R%s%h%m),R%d",
/* 32 */
"AND%C%S", armdps, 0, "(R%s%hR%M),R%n,R%d",
"EOR%C%S", armdps, 0, "(R%s%hR%M),R%n,R%d",
"SUB%C%S", armdps, 0, "(R%s%hR%M),R%n,R%d",
"RSB%C%S", armdps, 0, "(R%s%hR%M),R%n,R%d",
"ADD%C%S", armdps, armfadd, "(R%s%hR%M),R%n,R%d",
"ADC%C%S", armdps, 0, "(R%s%hR%M),R%n,R%d",
"SBC%C%S", armdps, 0, "(R%s%hR%M),R%n,R%d",
"RSC%C%S", armdps, 0, "(R%s%hR%M),R%n,R%d",
"TST%C%S", armdps, 0, "(R%s%hR%M),R%n",
"TEQ%C%S", armdps, 0, "(R%s%hR%M),R%n",
"CMP%C%S", armdps, 0, "(R%s%hR%M),R%n",
"CMN%C%S", armdps, 0, "(R%s%hR%M),R%n",
"ORR%C%S", armdps, 0, "(R%s%hR%M),R%n,R%d",
"MOVW%C%S", armdps, armfmov, "(R%s%hR%M),R%d",
"BIC%C%S", armdps, 0, "(R%s%hR%M),R%n,R%d",
"MVN%C%S", armdps, 0, "(R%s%hR%M),R%d",
/* 48 */
"AND%C%S", armdpi, 0, "$#%i,R%n,R%d",
"EOR%C%S", armdpi, 0, "$#%i,R%n,R%d",
"SUB%C%S", armdpi, 0, "$#%i,R%n,R%d",
"RSB%C%S", armdpi, 0, "$#%i,R%n,R%d",
"ADD%C%S", armdpi, armfadd, "$#%i,R%n,R%d",
"ADC%C%S", armdpi, 0, "$#%i,R%n,R%d",
"SBC%C%S", armdpi, 0, "$#%i,R%n,R%d",
"RSC%C%S", armdpi, 0, "$#%i,R%n,R%d",
"TST%C%S", armdpi, 0, "$#%i,R%n",
"TEQ%C%S", armdpi, 0, "$#%i,R%n",
"CMP%C%S", armdpi, 0, "$#%i,R%n",
"CMN%C%S", armdpi, 0, "$#%i,R%n",
"ORR%C%S", armdpi, 0, "$#%i,R%n,R%d",
"MOVW%C%S", armdpi, armfmov, "$#%i,R%d",
"BIC%C%S", armdpi, 0, "$#%i,R%n,R%d",
"MVN%C%S", armdpi, 0, "$#%i,R%d",
/* 48+16 */
"MUL%C%S", armdpi, 0, "R%M,R%s,R%n",
"MULA%C%S", armdpi, 0, "R%M,R%s,R%n,R%d",
"SWPW", armdpi, 0, "R%s,(R%n),R%d",
"SWPB", armdpi, 0, "R%s,(R%n),R%d",
/* 48+16+4 */
"MOV%u%C%p", armhwby, 0, "R%d,(R%n%UR%M)",
"MOV%u%C%p", armhwby, 0, "R%d,%I",
"MOV%u%C%p", armhwby, armfmov, "(R%n%UR%M),R%d",
"MOV%u%C%p", armhwby, armfmov, "%I,R%d",
/* 48+24 */
"MOVW%C%p", armsdti, 0, "R%d,%I",
"MOVB%C%p", armsdti, 0, "R%d,%I",
"MOVW%C%p", armsdti, armfmov, "%I,R%d",
"MOVBU%C%p", armsdti, armfmov, "%I,R%d",
"MOVW%C%p", armsdts, 0, "R%d,(R%s%h%m)(R%n)",
"MOVB%C%p", armsdts, 0, "R%d,(R%s%h%m)(R%n)",
"MOVW%C%p", armsdts, armfmov, "(R%s%h%m)(R%n),R%d",
"MOVBU%C%p", armsdts, armfmov, "(R%s%h%m)(R%n),R%d",
"MOVM%C%P%a", armbdt, armfmovm, "[%r],(R%n)",
"MOVM%C%P%a", armbdt, armfmovm, "(R%n),[%r]",
"B%C", armb, armfbranch, "%b",
"BL%C", armb, armfbranch, "%b",
"CDP%C", armco, 0, "",
"CDP%C", armco, 0, "",
"MCR%C", armco, 0, "",
"MRC%C", armco, 0, "",
/* 48+24+4+4+2+2+4 */
"MULLU%C%S", armdpi, 0, "R%M,R%s,(R%n,R%d)",
"MULALU%C%S", armdpi, 0, "R%M,R%s,(R%n,R%d)",
"MULL%C%S", armdpi, 0, "R%M,R%s,(R%n,R%d)",
"MULAL%C%S", armdpi, 0, "R%M,R%s,(R%n,R%d)",
/* 48+24+4+4+2+2+4+4 */
"UNK", armunk, 0, "",
};
static void
gaddr(Instr *i)
{
*i->curr++ = '$';
i->curr += gsymoff(i->curr, i->end-i->curr, i->imm, CANY);
}
static char *mode[] = { 0, "IA", "DB", "IB" };
static char *pw[] = { "P", "PW", 0, "W" };
static char *sw[] = { 0, "W", "S", "SW" };
static void
format(char *mnemonic, Instr *i, char *f)
{
int j, k, m, n;
int g;
char *fmt;
if(mnemonic)
format(0, i, mnemonic);
if(f == 0)
return;
if(mnemonic)
if(i->curr < i->end)
*i->curr++ = '\t';
for ( ; *f && i->curr < i->end; f++) {
if(*f != '%') {
*i->curr++ = *f;
continue;
}
switch (*++f) {
case 'C': /* .CONDITION */
if(cond[i->cond])
bprint(i, ".%s", cond[i->cond]);
break;
case 'S': /* .STORE */
if(i->store)
bprint(i, ".S");
break;
case 'P': /* P & U bits for block move */
n = (i->w >>23) & 0x3;
if (mode[n])
bprint(i, ".%s", mode[n]);
break;
case 'p': /* P & W bits for single data xfer*/
if (pw[i->store])
bprint(i, ".%s", pw[i->store]);
break;
case 'a': /* S & W bits for single data xfer*/
if (sw[i->store])
bprint(i, ".%s", sw[i->store]);
break;
case 's':
bprint(i, "%d", i->rs & 0xf);
break;
case 'M':
bprint(i, "%lud", (i->w>>8) & 0xf);
break;
case 'm':
bprint(i, "%lud", (i->w>>7) & 0x1f);
break;
case 'h':
bprint(i, shtype[(i->w>>5) & 0x3]);
break;
case 'u': /* Signed/unsigned Byte/Halfword */
bprint(i, hb[(i->w>>5) & 0x3]);
break;
case 'I':
if (i->rn == 13) {
if (plocal(i))
break;
}
g = 0;
fmt = "#%lx(R%d)";
if (i->rn == 15) {
/* convert load of offset(PC) to a load immediate */
if (get4(i->map, i->addr+i->imm+8, (ulong*)&i->imm) > 0)
{
g = 1;
fmt = "";
}
}
if (mach->sb)
{
if (i->rd == 11) {
ulong nxti;
if (get4(i->map, i->addr+4, &nxti) > 0) {
if ((nxti & 0x0e0f0fff) == 0x060c000b) {
i->imm += mach->sb;
g = 1;
fmt = "-SB";
}
}
}
if (i->rn == 12)
{
i->imm += mach->sb;
g = 1;
fmt = "-SB(SB)";
}
}
if (g)
{
gaddr(i);
bprint(i, fmt, i->rn);
}
else
bprint(i, fmt, i->imm, i->rn);
break;
case 'U': /* Add/subtract from base */
bprint(i, addsub[(i->w >> 23) & 1]);
break;
case 'n':
bprint(i, "%d", i->rn);
break;
case 'd':
bprint(i, "%d", i->rd);
break;
case 'i':
bprint(i, "%lux", i->imm);
break;
case 'b':
i->curr += symoff(i->curr, i->end-i->curr,
i->imm, CTEXT);
break;
case 'g':
i->curr += gsymoff(i->curr, i->end-i->curr,
i->imm, CANY);
break;
case 'r':
n = i->imm&0xffff;
j = 0;
k = 0;
while(n) {
m = j;
while(n&0x1) {
j++;
n >>= 1;
}
if(j != m) {
if(k)
bprint(i, ",");
if(j == m+1)
bprint(i, "R%d", m);
else
bprint(i, "R%d-R%d", m, j-1);
k = 1;
}
j++;
n >>= 1;
}
break;
case '\0':
*i->curr++ = '%';
return;
default:
bprint(i, "%%%c", *f);
break;
}
}
*i->curr = 0;
}
static int
printins(Map *map, uvlong pc, char *buf, int n)
{
Instr i;
i.curr = buf;
i.end = buf+n-1;
if(decode(map, pc, &i) < 0)
return -1;
(*opcodes[i.op].fmt)(&opcodes[i.op], &i);
return 4;
}
static int
arminst(Map *map, uvlong pc, char modifier, char *buf, int n)
{
USED(modifier);
return printins(map, pc, buf, n);
}
static int
armdas(Map *map, uvlong pc, char *buf, int n)
{
Instr i;
i.curr = buf;
i.end = buf+n;
if(decode(map, pc, &i) < 0)
return -1;
if(i.end-i.curr > 8)
i.curr = _hexify(buf, i.w, 7);
*i.curr = 0;
return 4;
}
static int
arminstlen(Map *map, uvlong pc)
{
Instr i;
if(decode(map, pc, &i) < 0)
return -1;
return 4;
}
static int
armfoll(Map *map, uvlong pc, Rgetter rget, uvlong *foll)
{
uvlong d;
Instr i;
if(decode(map, pc, &i) < 0)
return -1;
if(opcodes[i.op].foll) {
d = (*opcodes[i.op].foll)(map, rget, &i, pc);
if(d == -1)
return -1;
} else
d = pc+4;
foll[0] = d;
return 1;
}
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