added 5e (not finished)

aiju 2011-06-16 17:49:24 +02:00
parent fcf30f314b
commit 2acb5433d8
9 changed files with 1629 additions and 0 deletions

76
sys/src/cmd/5e/5e.c Normal file
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#include <u.h>
#include <libc.h>
#include <thread.h>
#include "dat.h"
#include "fns.h"
Process **PP;
static int nflag;
void
dump(void)
{
int i;
for(i = 0; i < 16; i++) {
print("R%2d %.8ux", i, P->R[i]);
if((i % 4) == 3) print("\n");
else print("\t");
}
}
static void
adjustns(void)
{
if(bind("/arm/bin", "/bin", MREPL) < 0)
sysfatal("bind: %r");
if(bind("/rc/bin", "/bin", MAFTER) < 0)
sysfatal("bind: %r");
putenv("cputype", "arm");
putenv("objtype", "arm");
}
void
cleanup(void)
{
if(P == nil)
return;
freesegs();
fddecref(P->fd);
free(P);
}
static void
usage(void)
{
fprint(2, "usage: 5e [ -n ] text [ args ]\n");
exits(nil);
}
void
main(int argc, char **argv)
{
ARGBEGIN {
case 'n': nflag++; break;
default: usage();
} ARGEND;
if(argc < 1)
usage();
if(_nprivates < 1)
sysfatal("we don't have privates");
if(rfork(RFREND | RFNAMEG | RFENVG) < 0)
sysfatal("rfork: %r");
atexit(cleanup);
if(nflag)
adjustns();
initproc();
if(loadtext(argv[0], argc, argv) < 0)
sysfatal("%r");
for(;;) {
if(ultraverbose)
dump();
step();
}
}

472
sys/src/cmd/5e/arm.c Normal file
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#include <u.h>
#include <libc.h>
#include <thread.h>
#include <bio.h>
#include <mach.h>
#include "dat.h"
#include "fns.h"
enum {
fI = 1<<25,
fP = 1<<24,
fLi = 1<<24,
fU = 1<<23,
fB = 1<<22,
fW = 1<<21,
fL = 1<<20,
fS = 1<<20,
fSg = 1<<6,
fH = 1<<5,
};
static void
invalid(u32int instr)
{
sysfatal("undefined instruction %8ux @ %8ux", instr, P->R[15] - 4);
}
static u32int
doshift(u32int instr)
{
ulong amount, val;
if((instr & (1<<4)) && (instr & (1<<7)))
invalid(instr);
if(instr & (1<<4))
amount = P->R[(instr >> 8) & 15];
else
amount = (instr >> 7) & 31;
val = P->R[instr & 15];
switch((instr >> 5) & 3) {
case 0:
return val << amount;
case 1:
return val >> amount;
case 2:
return ((long) val) >> amount;
case 3:
return (val >> amount) | (val << (32 - amount));
}
return 0;
}
static void
single(u32int instr)
{
long offset;
u32int addr;
u32int *Rn, *Rd;
void *targ;
Segment *seg;
if(instr & fI) {
if(instr & (1<<4))
invalid(instr);
offset = doshift(instr);
} else
offset = instr & ((1<<12) - 1);
if(!(instr & fU))
offset = - offset;
Rn = P->R + ((instr >> 16) & 15);
Rd = P->R + ((instr >> 12) & 15);
if((instr & (fW | fP)) == fW)
invalid(instr);
if(Rn == P->R + 15) {
if(instr & fW)
invalid(instr);
addr = P->R[15] + 4;
}
else
addr = *Rn;
if(instr & fP)
addr += offset;
targ = vaddr(addr, &seg);
switch(instr & (fB | fL)) {
case 0:
*(u32int*) targ = *Rd;
break;
case fB:
*(u8int*) targ = *Rd;
break;
case fL:
*Rd = *(u32int*) targ;
break;
case fB | fL:
*Rd = *(u8int*) targ;
break;
}
if(Rd == P->R + 15 && !(instr & fL)) {
if(instr & fB)
*(u8int*) targ += 8;
else
*(u32int*) targ += 8;
}
segunlock(seg);
if(!(instr & fP))
addr += offset;
if((instr & fW) || !(instr & fP))
*Rn = addr;
}
static void
swap(u32int instr)
{
u32int *Rm, *Rn, *Rd, *targ, tmp;
Segment *seg;
Rm = P->R + (instr & 15);
Rd = P->R + ((instr >> 12) & 15);
Rn = P->R + ((instr >> 16) & 15);
if(Rm == P->R + 15 || Rd == P->R + 15 || Rn == P->R + 15)
invalid(instr);
targ = (u32int *) vaddr(*Rn, &seg);
lock(&seg->lock);
if(instr & fB) {
tmp = *(u8int*) targ;
*(u8int*) targ = *Rm;
*Rd = tmp;
} else {
tmp = *targ;
*targ = *Rm;
*Rd = tmp;
}
unlock(&seg->lock);
segunlock(seg);
}
static u32int
add(u32int a, u32int b, u8int type, u8int *carry, u8int *overflow)
{
u32int res1;
u64int res2;
if(type) {
res2 = (u64int)a - b + *carry - 1;
res1 = res2;
if(((a ^ b) & (1<<31)) && !((b ^ res1) & (1<<31))) *overflow = 1;
if(res2 & 0x100000000LL) *carry = 0;
else *carry = 1;
} else {
res2 = (u64int)a + b + *carry;
res1 = res2;
if(!((a ^ b) & (1<<31)) && ((b ^ res1) & (1<<31))) *overflow = 1;
if(res2 & 0x100000000LL) *carry = 1;
else *carry = 0;
}
return res1;
}
static void
alu(u32int instr)
{
u32int Rn, *Rd, operand, shift, result, op;
u8int carry, overflow;
Rn = P->R[(instr >> 16) & 15];
Rd = P->R + ((instr >> 12) & 15);
if(((instr >> 16) & 15) == 15) {
Rn += 4;
if(!(instr & fI) && (instr & (1<<4)))
Rn += 4;
}
if(Rd == P->R + 15 && (instr & fS))
invalid(instr);
if(instr & fI) {
operand = instr & 0xFF;
shift = ((instr >> 8) & 15) << 1;
operand = (operand >> shift) | (operand << (32 - shift));
} else
operand = doshift(instr);
op = (instr >> 21) & 15;
carry = 0;
if(op >= 8 && op <= 11 && !(instr & fS))
sysfatal("no PSR transfers plz");
if(op >= 5 && op < 8) {
if(P->CPSR & flC)
carry = 1;
} else {
if(op != 4 && op != 5 && op != 11)
carry = 1;
}
overflow = 0;
switch(op) {
case 0: case 8: result = Rn & operand; break;
case 1: case 9: result = Rn ^ operand; break;
case 2: case 6: case 10: result = add(Rn, operand, 1, &carry, &overflow); break;
case 3: case 7: result = add(operand, Rn, 1, &carry, &overflow); break;
case 4: case 5: case 11: result = add(operand, Rn, 0, &carry, &overflow); break;
case 12: result = Rn | operand; break;
case 13: result = operand; break;
case 14: result = Rn & ~operand; break;
case 15: result = ~operand; break;
default: result = 0; /* never happens */
}
if(instr & fS) {
P->CPSR &= ~FLAGS;
if(result == 0)
P->CPSR |= flZ;
if(result & (1<<31))
P->CPSR |= flN;
if(carry && op > 1 && op < 12)
P->CPSR |= flC;
if(overflow)
P->CPSR |= flV;
}
if(op < 8 || op >= 12)
*Rd = result;
}
static void
branch(u32int instr)
{
long offset;
offset = instr & ((1<<24) - 1);
if(offset & (1<<23))
offset |= ~((1 << 24) - 1);
offset *= 4;
if(instr & fLi)
P->R[14] = P->R[15];
P->R[15] += offset + 4;
}
static void
halfword(u32int instr)
{
u32int offset, target, *Rn, *Rd;
Segment *seg;
if(instr & (1<<22)) {
offset = (instr & 15) | ((instr >> 4) & 0xF0);
} else {
if((instr & 15) == 15)
invalid(instr);
offset = P->R[instr & 15];
}
if(!(instr & fU))
offset = - offset;
if(!(instr & fP) && (instr & fW))
invalid(instr);
Rn = P->R + ((instr >> 16) & 15);
Rd = P->R + ((instr >> 12) & 15);
if(Rn == P->R + 15 || Rd == P->R + 15)
sysfatal("R15 in halfword");
target = *Rn;
if(instr & fP)
target += offset;
switch(instr & (fSg | fH | fL)) {
case fSg: *(u8int*) vaddr(target, &seg) = *Rd; break;
case fSg | fL: *Rd = (long) *(char*) vaddr(target, &seg); break;
case fH: case fSg | fH: *(u16int*) vaddr(target, &seg) = *Rd; break;
case fH | fL: *Rd = *(u16int*) vaddr(target, &seg); break;
case fH | fL | fSg: *Rd = (long) *(short*) vaddr(target, &seg); break;
}
segunlock(seg);
if(!(instr & fP))
target += offset;
if(!(instr & fP) || (instr & fW))
*Rn = target;
}
static void
block(u32int instr)
{
int i;
u32int targ, *Rn;
Segment *seg;
if(instr & (1<<22))
invalid(instr);
Rn = P->R + ((instr >> 16) & 15);
if(Rn == P->R + 15 || instr & (1<<15))
sysfatal("R15 block");
targ = *Rn;
if(instr & fU) {
for(i = 0; i < 16; i++) {
if(!(instr & (1<<i)))
continue;
if(instr & fP)
targ += 4;
if(instr & fL)
P->R[i] = *(u32int*) vaddr(targ, &seg);
else
*(u32int*) vaddr(targ, &seg) = P->R[i];
segunlock(seg);
if(!(instr & fP))
targ += 4;
}
} else {
for(i = 15; i >= 0; i--) {
if(!(instr & (1<<i)))
continue;
if(instr & fP)
targ -= 4;
if(instr & fL)
P->R[i] = *(u32int*) vaddr(targ, &seg);
else
*(u32int*) vaddr(targ, &seg) = P->R[i];
segunlock(seg);
if(!(instr & fP))
targ -= 4;
}
}
if(instr & fW)
*Rn = targ;
}
static void
multiply(u32int instr)
{
u32int *Rd, *Rn, *Rs, *Rm, res;
Rm = P->R + (instr & 15);
Rs = P->R + ((instr >> 8) & 15);
Rn = P->R + ((instr >> 12) & 15);
Rd = P->R + ((instr >> 16) & 15);
if(Rd == Rm || Rm == P->R + 15 || Rs == P->R + 15 || Rn == P->R + 15 || Rd == P->R + 15)
invalid(instr);
res = *Rm * *Rs;
if(instr & (1<<21))
res += *Rn;
*Rd = res;
if(instr & (1<<20)) {
P->CPSR &= ~(flN | flZ);
if(res & (1<<31))
P->CPSR |= flN;
if(res == 0)
P->CPSR |= flZ;
}
}
static void
multiplylong(u32int instr)
{
u32int *RdH, *RdL, *Rs, *Rm;
u64int res;
Rm = P->R + (instr & 15);
Rs = P->R + ((instr >> 8) & 15);
RdL = P->R + ((instr >> 12) & 15);
RdH = P->R + ((instr >> 16) & 15);
if(RdL == RdH || RdH == Rm || RdL == Rm || Rm == P->R + 15 || Rs == P->R + 15 || RdL == P->R + 15 || RdH == P->R + 15)
invalid(instr);
if(instr & (1<<22)) {
res = *Rs;
res *= *Rm;
} else
res = ((vlong)*(int*)Rs) * *(int*)Rm;
if(instr & (1<<21)) {
res += *RdL;
res += ((uvlong)*RdH) << 32;
}
*RdL = res;
*RdH = res >> 32;
if(instr & (1<<20)) {
P->CPSR &= ~FLAGS;
if(res == 0)
P->CPSR |= flN;
if(res & (1LL<<63))
P->CPSR |= flV;
}
}
static void
singleex(u32int instr)
{
u32int *Rn, *Rd, *Rm, *targ;
Segment *seg;
Rd = P->R + ((instr >> 12) & 15);
Rn = P->R + ((instr >> 16) & 15);
if(Rd == P->R + 15 || Rn == P->R + 15)
invalid(instr);
if(instr & fS) {
targ = vaddr(*Rn, &seg);
lock(&seg->lock);
*Rd = *targ;
segunlock(seg);
} else {
Rm = P->R + (instr & 15);
if(Rm == P->R + 15)
invalid(instr);
targ = vaddr(*Rn, &seg);
if(canlock(&seg->lock)) {
*Rd = 1;
} else {
*targ = *Rd;
unlock(&seg->lock);
*Rd = 0;
}
segunlock(seg);
}
}
void
step(void)
{
u32int instr;
Segment *seg;
instr = *(u32int*) vaddr(P->R[15], &seg);
segunlock(seg);
if(fulltrace) {
print("%d ", P->pid);
if(havesymbols) {
Symbol s;
char buf[512];
if(findsym(P->R[15], CTEXT, &s) >= 0)
print("%s ", s.name);
if(fileline(buf, 512, P->R[15]) >= 0)
print("%s ", buf);
}
print("%.8ux %.8ux %c%c%c%c\n", P->R[15], instr,
(P->CPSR & flZ) ? 'Z' : ' ',
(P->CPSR & flC) ? 'C' : ' ',
(P->CPSR & flN) ? 'N' : ' ',
(P->CPSR & flV) ? 'V' : ' '
);
}
P->R[15] += 4;
switch(instr >> 28) {
case 0x0: if(!(P->CPSR & flZ)) return; break;
case 0x1: if(P->CPSR & flZ) return; break;
case 0x2: if(!(P->CPSR & flC)) return; break;
case 0x3: if(P->CPSR & flC) return; break;
case 0x4: if(!(P->CPSR & flN)) return; break;
case 0x5: if(P->CPSR & flN) return; break;
case 0x6: if(!(P->CPSR & flV)) return; break;
case 0x7: if(P->CPSR & flV) return; break;
case 0x8: if(!(P->CPSR & flC) || (P->CPSR & flZ)) return; break;
case 0x9: if((P->CPSR & flC) && !(P->CPSR & flZ)) return; break;
case 0xA: if(!(P->CPSR & flN) != !(P->CPSR & flV)) return; break;
case 0xB: if(!(P->CPSR & flN) == !(P->CPSR & flV)) return; break;
case 0xC: if((P->CPSR & flZ) || !(P->CPSR & flN) != !(P->CPSR & flV)) return; break;
case 0xD: if(!(P->CPSR & flZ) && !(P->CPSR & flN) == !(P->CPSR & flV)) return; break;
case 0xE: break;
default: sysfatal("condition code %x not implemented", instr >> 28);
}
if((instr & 0x0FB00FF0) == 0x01000090)
swap(instr);
else if((instr & 0x0FE000F0) == 0x01800090)
singleex(instr);
else if((instr & 0x0FC000F0) == 0x90)
multiply(instr);
else if((instr & 0x0F8000F0) == 0x800090)
multiplylong(instr);
else if((instr & ((1<<26) | (1<<27))) == (1 << 26))
single(instr);
else if((instr & 0x0E000090) == 0x90 && (instr & 0x60))
halfword(instr);
else if((instr & ((1<<26) | (1<<27))) == 0)
alu(instr);
else if((instr & (7<<25)) == (5 << 25))
branch(instr);
else if((instr & (15<<24)) == (15 << 24))
syscall();
else if((instr & (7<<25)) == (4 << 25))
block(instr);
else
invalid(instr);
}

65
sys/src/cmd/5e/dat.h Normal file
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typedef struct Process Process;
typedef struct Segment Segment;
typedef struct Fdtable Fdtable;
typedef struct Fd Fd;
enum {
STACKTOP = 0x80000000UL,
STACKSIZE = 0x10000,
FDBLOCK = 16,
SEGNUM = 8,
flN = 1<<31,
flZ = 1<<30,
flC = 1<<29,
flV = 1<<28,
FLAGS = flN | flZ | flC | flV,
};
enum {
SEGTEXT,
SEGDATA,
SEGBSS,
SEGSTACK,
};
struct Process {
Segment* S[SEGNUM];
u32int R[16]; /* general purpose registers / PC (R15) */
u32int CPSR; /* status register */
char errbuf[ERRMAX];
Fd *fd;
int pid;
};
extern void **_privates;
extern int _nprivates;
#define P (*(Process**)_privates)
enum {
SEGFLLOCK = 1,
};
struct Segment {
Ref;
int flags;
RWLock rw; /* lock for SEGLOCK segments */
Lock lock; /* atomic accesses */
u32int start, size;
void *data;
Ref *ref;
};
struct Fd {
RWLock;
Ref ref;
u8int *fds;
int nfds;
};
#define fulltrace 0
#define havesymbols 0
#define ultraverbose 0
#define systrace 0

23
sys/src/cmd/5e/fns.h Normal file
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void *emalloc(u32int);
void *emallocz(u32int);
void *erealloc(void *, u32int);
void initproc(void);
int loadtext(char *, int, char **);
Segment *newseg(u32int, u32int, int);
void *vaddr(u32int, Segment **);
void *vaddrnol(u32int);
void step(void);
void syscall(void);
void cherrstr(char *, ...);
u32int noteerr(u32int, u32int);
void freesegs(void);
Fd *newfd(void);
Fd *copyfd(Fd *);
void fddecref(Fd *);
int iscexec(Fd *, int);
void setcexec(Fd *, int, int);
void cleanup(void);
void segunlock(Segment *);
void *copyifnec(u32int, int, int *);
void *bufifnec(u32int, int, int *);
void copyback(u32int, int, void *);

7
sys/src/cmd/5e/mkfile Normal file
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</$objtype/mkfile
TARG=5e
OFILES=5e.$O seg.$O proc.$O util.$O arm.$O sys.$O
HFILES=dat.h fns.h
</sys/src/cmd/mkone

244
sys/src/cmd/5e/proc.c Normal file
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#include <u.h>
#include <libc.h>
#include <thread.h>
#include <bio.h>
#include <mach.h>
#include <ctype.h>
#include <tos.h>
#include "dat.h"
#include "fns.h"
void
initproc(void)
{
P = emallocz(sizeof(Process));
P->pid = getpid();
P->fd = newfd();
}
static void
initstack(int argc, char **argv)
{
ulong tos, sp, ap, size, i, len;
tos = STACKTOP - sizeof(Tos) * 2;
sp = tos;
size = 8;
for(i = 0; i < argc; i++)
size += strlen(argv[i]) + 5;
sp -= size;
sp &= ~7;
P->R[0] = tos;
P->R[1] = STACKTOP - 4;
P->R[13] = sp;
*(ulong *) vaddrnol(sp) = argc;
sp += 4;
ap = sp + (argc + 1) * 4;
for(i = 0; i < argc; i++) {
*(ulong *) vaddrnol(sp) = ap;
sp += 4;
len = strlen(argv[i]) + 1;
memcpy(vaddrnol(ap), argv[i], len);
ap += len;
}
*(ulong *) vaddrnol(sp) = 0;
((Tos *) vaddrnol(tos))->pid = getpid();
}
static int
loadscript(int fd, char *file, int argc, char **argv)
{
char buf[513], *p, **q, **nargv;
int rc, nargc, i;
seek(fd, 0, 0);
rc = readn(fd, buf, 512);
if(rc <= 0)
goto invalid;
close(fd);
buf[rc] = 0;
p = strchr(buf, '\n');
if(p == nil)
goto invalid;
*p = 0;
while(isspace(*--p))
*p = 0;
nargc = 0;
p = buf + 2;
while(*p) {
while(*p && isspace(*p))
p++;
nargc++;
while(*p && !isspace(*p))
p++;
}
if(nargc == 0)
goto invalid;
nargv = emallocz(sizeof(char *) * (nargc + argc));
q = nargv;
p = buf + 2;
while(*p) {
while(*p && isspace(*p))
p++;
*(p-1) = 0;
*q++ = p;
while(*p && !isspace(*p))
p++;
}
*q++ = file;
for(i = 1; i < argc; i++)
*q++ = argv[i];
rc = loadtext(*nargv, argc + nargc, nargv);
free(nargv);
return rc;
invalid:
werrstr("exec header invalid");
return -1;
}
int
loadtext(char *file, int argc, char **argv)
{
int fd, i;
Fhdr fp;
Segment *text, *data, *bss, *stack;
char buf[2];
fd = open(file, OREAD);
if(fd < 0) return -1;
if(pread(fd, buf, 2, 0) == 2 && buf[0] == '#' && buf[1] == '!')
return loadscript(fd, file, argc, argv);
seek(fd, 0, 0);
if(crackhdr(fd, &fp) == 0) {
werrstr("exec header invalid");
return -1;
}
if(fp.magic != E_MAGIC) {
werrstr("exec header invalid");
return -1;
}
freesegs();
memset(P->R, 0, sizeof(P->R));
P->CPSR = 0;
text = newseg(fp.txtaddr - fp.hdrsz, fp.txtsz + fp.hdrsz, SEGTEXT);
data = newseg(fp.dataddr, fp.datsz, SEGDATA);
bss = newseg(fp.dataddr + fp.datsz, fp.bsssz, SEGBSS);
stack = newseg(STACKTOP - STACKSIZE, STACKSIZE, SEGSTACK);
seek(fd, fp.txtoff - fp.hdrsz, 0);
if(readn(fd, text->data, fp.txtsz + fp.hdrsz) < fp.txtsz + fp.hdrsz)
sysfatal("%r");
seek(fd, fp.datoff, 0);
if(readn(fd, data->data, fp.datsz) < fp.datsz)
sysfatal("%r");
memset(bss->data, 0, bss->size);
memset(stack->data, 0, stack->size);
P->R[15] = fp.entry;
if(havesymbols && syminit(fd, &fp) < 0)
fprint(2, "initializing symbol table: %r\n");
close(fd);
for(i = 0; i < P->fd->nfds * 8; i++)
if(iscexec(P->fd, i))
close(i);
wlock(P->fd);
free(P->fd->fds);
P->fd->fds = nil;
P->fd->nfds = 0;
wunlock(P->fd);
initstack(argc, argv);
return 0;
}
void
cherrstr(char *str, ...)
{
va_list va;
va_start(va, str);
vsnprint(P->errbuf, ERRMAX, str, va);
va_end(va);
}
u32int
noteerr(u32int x, u32int y)
{
if(((int)x) >= ((int)y))
return x;
rerrstr(P->errbuf, ERRMAX);
return x;
}
Fd *
newfd(void)
{
Fd *fd;
fd = emallocz(sizeof(*fd));
incref(&fd->ref);
return fd;
}
Fd *
copyfd(Fd *old)
{
Fd *new;
rlock(old);
new = newfd();
if(old->nfds > 0) {
new->nfds = old->nfds;
new->fds = emalloc(old->nfds);
memcpy(new->fds, old->fds, old->nfds);
}
runlock(old);
return new;
}
void
fddecref(Fd *fd)
{
if(decref(&fd->ref) == 0) {
free(fd->fds);
free(fd);
}
}
int
iscexec(Fd *fd, int n)
{
int r;
r = 0;
rlock(fd);
if(n / 8 < fd->nfds)
r = (fd->fds[n / 8] & (1 << (n % 8))) != 0;
runlock(fd);
return r;
}
void
setcexec(Fd *fd, int n, int status)
{
int old;
wlock(fd);
if(n / 8 >= fd->nfds) {
if(status == 0) {
wunlock(fd);
return;
}
old = fd->nfds;
fd->nfds = (n / 8) + 1;
fd->fds = erealloc(fd->fds, fd->nfds);
memset(fd->fds + old, 0, fd->nfds - old);
}
if(status == 0)
fd->fds[n / 8] &= ~(1 << (n % 8));
else
fd->fds[n / 8] |= (1 << (n % 8));
wunlock(fd);
}

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#include <u.h>
#include <libc.h>
#include <thread.h>
#include "dat.h"
#include "fns.h"
Segment *
newseg(u32int start, u32int size, int idx)
{
Segment *s;
s = emallocz(sizeof *s);
incref(s);
s->start = start;
s->size = size;
s->ref = emalloc(size + sizeof(Ref));
memset(s->ref, 0, sizeof(Ref));
incref(s->ref);
s->data = s->ref + 1;
if(idx == SEGBSS)
s->flags = SEGFLLOCK;
P->S[idx] = s;
return s;
}
void
freesegs(void)
{
Segment **s;
for(s = P->S; s < P->S + SEGNUM; s++) {
if(*s == nil)
continue;
if(decref((*s)->ref) == 0)
free((*s)->ref);
if(decref(*s) == 0)
free(*s);
*s = nil;
}
}
void *
vaddr(u32int addr, Segment **seg)
{
Segment **ss, *s;
for(ss = P->S; ss < P->S + SEGNUM; ss++) {
if(*ss == nil)
continue;
s = *ss;
if(addr >= s->start && addr < s->start + s->size) {
if(s->flags & SEGFLLOCK)
rlock(&s->rw);
*seg = s;
return (char *)s->data + (addr - s->start);
}
}
sysfatal("fault %.8ux @ %.8ux", addr, P->R[15]);
return nil;
}
void *
vaddrnol(u32int addr)
{
Segment *seg;
void *ret;
ret = vaddr(addr, &seg);
segunlock(seg);
return ret;
}
/* might be made a macro for hurr durr performance */
void
segunlock(Segment *s)
{
if(s->flags & SEGFLLOCK)
runlock(&s->rw);
}
void *
copyifnec(u32int addr, int len, int *copied)
{
void *targ, *ret;
Segment *seg;
targ = vaddr(addr, &seg);
if((seg->flags & SEGFLLOCK) == 0) {
*copied = 0;
return targ;
}
if(len < 0)
len = strlen(targ) + 1;
ret = emalloc(len);
memcpy(ret, targ, len);
segunlock(seg);
*copied = 1;
return ret;
}
void *
bufifnec(u32int addr, int len, int *buffered)
{
void *targ;
Segment *seg;
targ = vaddr(addr, &seg);
if((seg->flags & SEGFLLOCK) == 0) {
*buffered = 0;
return targ;
}
segunlock(seg);
*buffered = 1;
return emalloc(len);
}
void
copyback(u32int addr, int len, void *data)
{
void *targ;
Segment *seg;
if(len <= 0)
return;
targ = vaddr(addr, &seg);
memmove(targ, data, len);
segunlock(seg);
free(data);
}

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#include <u.h>
#include <libc.h>
#include <thread.h>
#include "dat.h"
#include "fns.h"
#include </sys/src/libc/9syscall/sys.h>
static u32int
arg(int n)
{
/* no locking necessary, since we're on the stack */
return *(u32int*) vaddrnol(P->R[13] + 4 + 4 * n);
}
static u64int
argv(int n)
{
return arg(n) | ((u64int)arg(n+1) << 32);
}
static void
sysopen(void)
{
u32int name, flags;
char *namet;
int fd, copied;
name = arg(0);
flags = arg(1);
namet = copyifnec(name, -1, &copied);
if(systrace)
fprint(2, "open(%#ux=\"%s\", %#o)\n", name, namet, flags);
fd = open(namet, flags);
if(copied)
free(namet);
if(fd < 0) {
noteerr(0, 1);
P->R[0] = fd;
return;
}
setcexec(P->fd, fd, flags & OCEXEC);
P->R[0] = fd;
}
static void
syscreate(void)
{
u32int name, flags, perm;
char *namet;
int fd, copied;
name = arg(0);
flags = arg(1);
perm = arg(2);
namet = copyifnec(name, -1, &copied);
if(systrace)
fprint(2, "create(%#ux=\"%s\", %#o, %o)\n", name, namet, flags, perm);
fd = create(namet, flags, perm);
if(copied)
free(namet);
if(fd < 0) {
noteerr(0, 1);
P->R[0] = fd;
return;
}
setcexec(P->fd, fd, flags & OCEXEC);
P->R[0] = fd;
}
static void
sysclose(void)
{
u32int fd;
fd = arg(0);
if(systrace)
fprint(2, "close(%d)\n", fd);
P->R[0] = noteerr(close(fd), 0);
if((fd & (1<<31)) == 0)
setcexec(P->fd, fd, 0);
}
static void
syspread(void)
{
int buffered;
u32int fd, size, buf;
u64int off;
void *targ;
fd = arg(0);
buf = arg(1);
size = arg(2);
off = argv(3);
if(systrace)
fprint(2, "pread(%d, %#ux, %ud, %#ullx)\n", fd, buf, size, off);
targ = bufifnec(buf, size, &buffered);
P->R[0] = noteerr(pread(fd, targ, size, off), size);
if(buffered)
copyback(buf, P->R[0], targ);
}
static void
syspwrite(void)
{
u32int fd, size, buf;
u64int off;
int copied;
void *buft;
fd = arg(0);
buf = arg(1);
size = arg(2);
off = argv(3);
buft = copyifnec(buf, size, &copied);
if(systrace)
fprint(2, "pwrite(%d, %#ux, %ud, %#ullx)\n", fd, buf, size, off);
P->R[0] = noteerr(pwrite(fd, buft, size, off), size);
if(copied)
free(buft);
}
static void
sysseek(void)
{
u32int fd, type;
vlong n, *ret;
Segment *seg;
ret = vaddr(arg(0), &seg);
fd = arg(1);
n = argv(2);
type = arg(4);
if(systrace)
fprint(2, "seek(%d, %lld, %d)\n", fd, n, type);
*ret = seek(fd, n, type);
if(*ret < 0) noteerr(0, 1);
segunlock(seg);
}
static void
sysfd2path(void)
{
u32int fd, buf, nbuf;
void *buft;
int buffered;
fd = arg(0);
buf = arg(1);
nbuf = arg(2);
buft = bufifnec(buf, nbuf, &buffered);
if(systrace)
fprint(2, "fd2path(%d, %#ux, %d)\n", fd, buf, nbuf);
P->R[0] = noteerr(fd2path(fd, buft, nbuf), 0);
if(buffered)
copyback(buf, nbuf, buft);
}
static void
sysstat(void)
{
u32int name, edir, nedir;
char *namet;
void *edirt;
int copied, buffered;
name = arg(0);
namet = copyifnec(name, -1, &copied);
edir = arg(1);
nedir = arg(2);
edirt = bufifnec(edir, nedir, &buffered);
if(systrace)
fprint(2, "stat(%#ux=\"%s\", %#ux, %ud)\n", name, namet, edir, nedir);
P->R[0] = noteerr(stat(namet, edirt, nedir), nedir);
if(copied)
free(namet);
if(buffered)
copyback(edir, P->R[0], edirt);
}
static void
sysfstat(void)
{
u32int fd, edir, nedir;
void *edirt;
int buffered;
fd = arg(0);
edir = arg(1);
nedir = arg(2);
edirt = bufifnec(edir, nedir, &buffered);
if(systrace)
fprint(2, "fstat(%d, %#ux, %d)\n", fd, edir, nedir);
P->R[0] = noteerr(fstat(fd, edirt, nedir), nedir);
if(buffered)
copyback(edir, P->R[0], edirt);
}
static void
sysexits(void)
{
if(arg(0) == 0)
exits(nil);
else
exits(vaddrnol(arg(0)));
}
static void
sysbrk(void)
{
ulong v;
Segment *s;
v = arg(0);
if(v >= P->S[SEGSTACK]->start)
sysfatal("bss > stack, wtf?");
if(v < P->S[SEGBSS]->start)
sysfatal("bss length < 0, wtf?");
s = P->S[SEGBSS];
wlock(&s->rw);
s->ref = realloc(s->ref, v - s->start + 4);
if(s->ref == nil)
sysfatal("error reallocating");
s->data = s->ref + 1;
if(s->size < v - s->start)
memset((char*)s->data + s->size, 0, v - s->start - s->size);
s->size = v - s->start;
P->R[0] = 0;
wunlock(&s->rw);
}
static void
syserrstr(void)
{
char buf[ERRMAX], *srct;
u32int src, len;
int copied;
src = arg(0);
len = arg(1);
srct = copyifnec(src, len, &copied);
strcpy(buf, P->errbuf);
utfecpy(P->errbuf, P->errbuf + ERRMAX, srct);
utfecpy(srct, srct + len, buf);
if(copied)
copyback(src, len, srct);
P->R[0] = 0;
}
static void
syschdir(void)
{
u32int dir;
char *dirt;
int copied;
dir = arg(0);
dirt = copyifnec(dir, -1, &copied);
if(systrace)
fprint(2, "chdir(%#ux=\"%s\")\n", dir, dirt);
P->R[0] = noteerr(chdir(dirt), 0);
if(copied)
free(dirt);
}
static void
sysnotify(void)
{
}
static void
sysrfork(void)
{
u32int flags;
int rc, i;
Process *p;
Segment *s, *t;
Fd *old;
enum {
RFORKPASS = RFENVG | RFCENVG | RFNOTEG | RFNOMNT | RFNAMEG | RFCNAMEG | RFNOWAIT | RFREND | RFFDG | RFCFDG,
RFORKHANDLED = RFPROC | RFMEM,
};
flags = arg(0);
if(systrace)
fprint(2, "rfork(%#o)\n", flags);
if(flags & ~(RFORKPASS | RFORKHANDLED))
sysfatal("rfork with unhandled flags %#o", flags & ~(RFORKPASS | RFORKHANDLED));
if((flags & RFPROC) == 0) {
if(flags & RFFDG) {
old = P->fd;
P->fd = copyfd(P->fd);
fddecref(old);
}
if(flags & RFCFDG) {
old = P->fd;
P->fd = newfd();
fddecref(old);
}
P->R[0] = noteerr(rfork(flags & RFORKPASS), 0);
return;
}
p = emallocz(sizeof(Process));
memcpy(p, P, sizeof(Process));
for(i = 0; i < SEGNUM; i++) {
s = p->S[i];
if(s == nil)
continue;
if((flags & RFMEM) == 0 && i != SEGTEXT || i == SEGSTACK) {
t = emallocz(sizeof(Segment));
incref(t);
t->size = s->size;
t->start = s->start;
t->ref = emalloc(sizeof(Ref) + s->size);
memset(t->ref, 0, sizeof(Ref));
incref(t->ref);
t->data = t->ref + 1;
memcpy(t->data, s->data, s->size);
p->S[i] = t;
} else {
incref(s);
incref(s->ref);
}
}
if(flags & RFFDG)
p->fd = copyfd(P->fd);
else if(flags & RFCFDG)
p->fd = newfd();
else
incref(&P->fd->ref);
rc = rfork(RFPROC | RFMEM | (flags & RFORKPASS));
if(rc < 0)
sysfatal("rfork: %r");
if(rc == 0) {
P = p;
atexit(cleanup);
P->pid = getpid();
}
P->R[0] = rc;
}
static void
sysexec(void)
{
u32int name, argv, *argvt;
char *namet, **argvv;
int i, argc, rc;
Segment *seg1, *seg2;
name = arg(0);
argv = arg(1);
namet = strdup(vaddr(name, &seg1));
segunlock(seg1);
argvt = vaddr(argv, &seg1);
if(systrace)
fprint(2, "exec(%#ux=\"%s\", %#ux)\n", name, namet, argv);
for(argc = 0; argvt[argc]; argc++)
;
argvv = emalloc(sizeof(char *) * argc);
for(i = 0; i < argc; i++) {
argvv[i] = strdup(vaddr(argvt[i], &seg2));
segunlock(seg2);
}
segunlock(seg1);
rc = loadtext(namet, argc, argvv);
for(i = 0; i < argc; i++)
free(argvv[i]);
free(argvv);
if(rc < 0)
P->R[0] = noteerr(rc, 0);
free(namet);
}
static void
sysawait(void)
{
u32int s, n;
void *st;
int buffered;
s = arg(0);
n = arg(1);
st = bufifnec(s, n, &buffered);
if(systrace)
fprint(2, "await(%#ux, %d)\n", s, n);
P->R[0] = noteerr(await(st, n), 0);
if(buffered)
copyback(s, P->R[0], st);
}
static void
syspipe(void)
{
u32int fd, *fdt;
int buffered;
fd = arg(0);
if(systrace)
fprint(2, "pipe(%#ux)\n", fd);
fdt = bufifnec(fd, 8, &buffered);
P->R[0] = noteerr(pipe((int *) fdt), 0);
if(buffered)
copyback(fd, 8, fdt);
}
static void
sysdup(void)
{
u32int oldfd, newfd;
oldfd = arg(0);
newfd = arg(1);
if(systrace)
fprint(2, "dup(%d, %d)\n", oldfd, newfd);
P->R[0] = noteerr(dup(oldfd, newfd), 0);
}
static void
syssleep(void)
{
u32int n;
n = arg(0);
if(systrace)
fprint(2, "sleep(%d)\n", n);
P->R[0] = noteerr(sleep(n), 0);
}
static void
sysrendezvous(void)
{
u32int tag, value;
tag = arg(0);
value = arg(1);
if(systrace)
fprint(2, "rendezvous(%#ux, %#ux)\n", tag, value);
P->R[0] = (u32int) rendezvous((void *) tag, (void *) value);
if(P->R[0] == ~0)
noteerr(0, 1);
}
static void
sysmount(void)
{
u32int fd, afd, old, flag, aname;
char *oldt, *anamet;
int copiedold, copiedaname;
fd = arg(0);
afd = arg(1);
old = arg(2);
flag = arg(3);
aname = arg(4);
oldt = copyifnec(old, -1, &copiedold);
if(aname) {
anamet = copyifnec(aname, -1, &copiedaname);
if(systrace)
fprint(2, "mount(%d, %d, %#x=\"%s\", %#o, %#x=\"%s\")\n", fd, afd, old, oldt, flag, aname, anamet);
} else {
anamet = nil;
copiedaname = 0;
if(systrace)
fprint(2, "mount(%d, %d, %#x=\"%s\", %#o, nil)\n", fd, afd, old, oldt, flag);
}
P->R[0] = noteerr(mount(fd, afd, oldt, flag, anamet), 0);
if(copiedold)
free(oldt);
if(copiedaname)
free(anamet);
}
static void
sysbind(void)
{
u32int name, old, flags;
char *namet, *oldt;
int copiedname, copiedold;
name = arg(0);
old = arg(1);
flags = arg(2);
namet = copyifnec(name, -1, &copiedname);
oldt = copyifnec(old, -1, &copiedold);
if(systrace)
fprint(2, "bind(%#ux=\"%s\", %#ux=\"%s\", %#o)\n", name, namet, old, oldt, flags);
P->R[0] = noteerr(bind(namet, oldt, flags), 0);
if(copiedname)
free(namet);
if(copiedold)
free(oldt);
}
static void
sysunmount(void)
{
u32int name, old;
char *namet, *oldt;
int copiedname, copiedold;
name = arg(0);
old = arg(1);
oldt = copyifnec(old, -1, &copiedold);
if(name == 0) {
namet = nil;
copiedname = 0;
if(systrace)
fprint(2, "unmount(nil, %#ux=\"%s\")\n", old, oldt);
P->R[0] = noteerr(unmount(nil, oldt), 0);
} else {
namet = copyifnec(name, -1, &copiedname);
if(systrace)
fprint(2, "unmount(%#ux=\"%s\", %#ux=\"%s\")\n", name, namet, old, oldt);
P->R[0] = noteerr(unmount(namet, oldt), 0);
}
if(copiedold)
free(oldt);
if(copiedname)
free(namet);
}
static void
sysremove(void)
{
u32int file;
char *filet;
int copied;
file = arg(0);
filet = copyifnec(file, -1, &copied);
if(systrace)
fprint(2, "remove(%#ux=\"%s\")\n", file, filet);
P->R[0] = noteerr(remove(filet), 0);
if(copied)
free(filet);
}
void
syscall(void)
{
u32int n;
static void (*calls[])(void) = {
[EXITS] sysexits,
[CLOSE] sysclose,
[OPEN] sysopen,
[CREATE] syscreate,
[PREAD] syspread,
[PWRITE] syspwrite,
[BRK_] sysbrk,
[ERRSTR] syserrstr,
[STAT] sysstat,
[FSTAT] sysfstat,
[SEEK] sysseek,
[CHDIR] syschdir,
[FD2PATH] sysfd2path,
[NOTIFY] sysnotify,
[RFORK] sysrfork,
[EXEC] sysexec,
[AWAIT] sysawait,
[PIPE] syspipe,
[SLEEP] syssleep,
[RENDEZVOUS] sysrendezvous,
[BIND] sysbind,
[UNMOUNT] sysunmount,
[DUP] sysdup,
[MOUNT] sysmount,
[REMOVE] sysremove,
};
n = P->R[0];
if(n >= nelem(calls) || calls[n] == nil)
sysfatal("no such syscall %d @ %#ux", n, P->R[15] - 4);
calls[n]();
}

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#include <u.h>
#include <libc.h>
#include <thread.h>
#include "dat.h"
#include "fns.h"
void *
emalloc(u32int size)
{
void *v;
v = malloc(size);
if(v == nil)
sysfatal("%r");
return v;
}
void *
emallocz(u32int size)
{
void *v;
v = emalloc(size);
memset(v, 0, size);
return v;
}
void *
erealloc(void *old, u32int size)
{
void *v;
v = realloc(old, size);
if(v == nil)
sysfatal("%r");
return v;
}