622 lines
15 KiB
C
622 lines
15 KiB
C
/* Native-dependent code for BSD Unix running on i386's, for GDB.
|
|
Copyright 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
$Id: freebsd-nat.c,v 1.3 1994/12/31 17:00:09 bde Exp $
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/param.h>
|
|
#include <signal.h>
|
|
#include <sys/user.h>
|
|
#include <machine/reg.h>
|
|
#include <machine/frame.h>
|
|
#include <sys/ptrace.h>
|
|
|
|
#include "defs.h"
|
|
|
|
/* this table must line up with REGISTER_NAMES in tm-i386v.h */
|
|
/* symbols like 'tEAX' come from <machine/reg.h> */
|
|
static int tregmap[] =
|
|
{
|
|
tEAX, tECX, tEDX, tEBX,
|
|
tESP, tEBP, tESI, tEDI,
|
|
tEIP, tEFLAGS, tCS, tSS,
|
|
tDS, tES, tSS, tSS, /* lies: no fs or gs */
|
|
};
|
|
|
|
/* blockend is the value of u.u_ar0, and points to the
|
|
place where ES is stored. */
|
|
|
|
int
|
|
i386_register_u_addr (blockend, regnum)
|
|
int blockend;
|
|
int regnum;
|
|
{
|
|
return (blockend + 4 * tregmap[regnum]);
|
|
}
|
|
|
|
|
|
#define fpstate save87
|
|
#define U_FPSTATE(u) u.u_pcb.pcb_savefpu
|
|
|
|
static void
|
|
i387_to_double (from, to)
|
|
char *from;
|
|
char *to;
|
|
{
|
|
long *lp;
|
|
/* push extended mode on 387 stack, then pop in double mode
|
|
*
|
|
* first, set exception masks so no error is generated -
|
|
* number will be rounded to inf or 0, if necessary
|
|
*/
|
|
asm ("pushl %eax"); /* grab a stack slot */
|
|
asm ("fstcw (%esp)"); /* get 387 control word */
|
|
asm ("movl (%esp),%eax"); /* save old value */
|
|
asm ("orl $0x3f,%eax"); /* mask all exceptions */
|
|
asm ("pushl %eax");
|
|
asm ("fldcw (%esp)"); /* load new value into 387 */
|
|
|
|
asm ("movl 8(%ebp),%eax");
|
|
asm ("fldt (%eax)"); /* push extended number on 387 stack */
|
|
asm ("fwait");
|
|
asm ("movl 12(%ebp),%eax");
|
|
asm ("fstpl (%eax)"); /* pop double */
|
|
asm ("fwait");
|
|
|
|
asm ("popl %eax"); /* flush modified control word */
|
|
asm ("fnclex"); /* clear exceptions */
|
|
asm ("fldcw (%esp)"); /* restore original control word */
|
|
asm ("popl %eax"); /* flush saved copy */
|
|
}
|
|
|
|
#if 0
|
|
static void
|
|
double_to_i387 (from, to)
|
|
char *from;
|
|
char *to;
|
|
{
|
|
/* push double mode on 387 stack, then pop in extended mode
|
|
* no errors are possible because every 64-bit pattern
|
|
* can be converted to an extended
|
|
*/
|
|
asm ("movl 8(%ebp),%eax");
|
|
asm ("fldl (%eax)");
|
|
asm ("fwait");
|
|
asm ("movl 12(%ebp),%eax");
|
|
asm ("fstpt (%eax)");
|
|
asm ("fwait");
|
|
}
|
|
#endif
|
|
|
|
struct env387
|
|
{
|
|
unsigned short control;
|
|
unsigned short r0;
|
|
unsigned short status;
|
|
unsigned short r1;
|
|
unsigned short tag;
|
|
unsigned short r2;
|
|
unsigned long eip;
|
|
unsigned short code_seg;
|
|
unsigned short opcode;
|
|
unsigned long operand;
|
|
unsigned short operand_seg;
|
|
unsigned short r3;
|
|
unsigned char regs[8][10];
|
|
};
|
|
|
|
/* static */ void
|
|
print_387_control_word (control)
|
|
unsigned int control;
|
|
{
|
|
printf ("control 0x%04x: ", control);
|
|
printf ("compute to ");
|
|
switch ((control >> 8) & 3)
|
|
{
|
|
case 0: printf ("24 bits; "); break;
|
|
case 1: printf ("(bad); "); break;
|
|
case 2: printf ("53 bits; "); break;
|
|
case 3: printf ("64 bits; "); break;
|
|
}
|
|
printf ("round ");
|
|
switch ((control >> 10) & 3)
|
|
{
|
|
case 0: printf ("NEAREST; "); break;
|
|
case 1: printf ("DOWN; "); break;
|
|
case 2: printf ("UP; "); break;
|
|
case 3: printf ("CHOP; "); break;
|
|
}
|
|
if (control & 0x3f)
|
|
{
|
|
printf ("mask:");
|
|
if (control & 0x0001) printf (" INVALID");
|
|
if (control & 0x0002) printf (" DENORM");
|
|
if (control & 0x0004) printf (" DIVZ");
|
|
if (control & 0x0008) printf (" OVERF");
|
|
if (control & 0x0010) printf (" UNDERF");
|
|
if (control & 0x0020) printf (" LOS");
|
|
printf (";");
|
|
}
|
|
printf ("\n");
|
|
if (control & 0xe080) printf ("warning: reserved bits on 0x%x\n",
|
|
control & 0xe080);
|
|
}
|
|
|
|
/* static */ void
|
|
print_387_status_word (status)
|
|
unsigned int status;
|
|
{
|
|
printf ("status 0x%04x: ", status);
|
|
if (status & 0xff)
|
|
{
|
|
printf ("exceptions:");
|
|
if (status & 0x0001) printf (" INVALID");
|
|
if (status & 0x0002) printf (" DENORM");
|
|
if (status & 0x0004) printf (" DIVZ");
|
|
if (status & 0x0008) printf (" OVERF");
|
|
if (status & 0x0010) printf (" UNDERF");
|
|
if (status & 0x0020) printf (" LOS");
|
|
if (status & 0x0040) printf (" FPSTACK");
|
|
printf ("; ");
|
|
}
|
|
printf ("flags: %d%d%d%d; ",
|
|
(status & 0x4000) != 0,
|
|
(status & 0x0400) != 0,
|
|
(status & 0x0200) != 0,
|
|
(status & 0x0100) != 0);
|
|
|
|
printf ("top %d\n", (status >> 11) & 7);
|
|
}
|
|
|
|
static void
|
|
print_387_status (status, ep)
|
|
unsigned short status;
|
|
struct env387 *ep;
|
|
{
|
|
int i;
|
|
int bothstatus;
|
|
int top;
|
|
int fpreg;
|
|
unsigned char *p;
|
|
|
|
bothstatus = ((status != 0) && (ep->status != 0));
|
|
if (status != 0)
|
|
{
|
|
if (bothstatus)
|
|
printf ("u: ");
|
|
print_387_status_word ((unsigned int)status);
|
|
}
|
|
|
|
if (ep->status != 0)
|
|
{
|
|
if (bothstatus)
|
|
printf ("e: ");
|
|
print_387_status_word ((unsigned int)ep->status);
|
|
}
|
|
|
|
print_387_control_word ((unsigned int)ep->control);
|
|
printf ("opcode 0x%x; ", ep->opcode);
|
|
printf ("pc 0x%x:0x%x; ", ep->code_seg, ep->eip);
|
|
printf ("operand 0x%x:0x%x\n", ep->operand_seg, ep->operand);
|
|
|
|
top = (ep->status >> 11) & 7;
|
|
|
|
printf (" regno tag msb lsb value\n");
|
|
for (fpreg = 7; fpreg >= 0; fpreg--)
|
|
{
|
|
int st_regno;
|
|
double val;
|
|
|
|
/* The physical regno `fpreg' is only relevant as an index into the
|
|
* tag word. Logical `%st' numbers are required for indexing ep->regs.
|
|
*/
|
|
st_regno = (fpreg + 8 - top) & 7;
|
|
|
|
printf ("%%st(%d) %s ", st_regno, fpreg == top ? "=>" : " ");
|
|
|
|
switch ((ep->tag >> (fpreg * 2)) & 3)
|
|
{
|
|
case 0: printf ("valid "); break;
|
|
case 1: printf ("zero "); break;
|
|
case 2: printf ("trap "); break;
|
|
case 3: printf ("empty "); break;
|
|
}
|
|
for (i = 9; i >= 0; i--)
|
|
printf ("%02x", ep->regs[st_regno][i]);
|
|
|
|
i387_to_double (ep->regs[st_regno], (char *)&val);
|
|
printf (" %g\n", val);
|
|
}
|
|
}
|
|
|
|
void
|
|
i386_float_info ()
|
|
{
|
|
struct user u; /* just for address computations */
|
|
int i;
|
|
/* fpstate defined in <sys/user.h> */
|
|
struct fpstate *fpstatep;
|
|
char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
|
|
unsigned int uaddr;
|
|
char fpvalid;
|
|
unsigned int rounded_addr;
|
|
unsigned int rounded_size;
|
|
/*extern int corechan;*/
|
|
int skip;
|
|
extern int inferior_pid;
|
|
|
|
uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
|
|
if (inferior_pid)
|
|
{
|
|
int *ip;
|
|
|
|
rounded_addr = uaddr & -sizeof (int);
|
|
rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
|
|
sizeof (int) - 1) / sizeof (int);
|
|
skip = uaddr - rounded_addr;
|
|
|
|
ip = (int *)buf;
|
|
for (i = 0; i < rounded_size; i++)
|
|
{
|
|
*ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t)rounded_addr, 0);
|
|
rounded_addr += sizeof (int);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
#if 1
|
|
printf("float info: can't do a core file (yet)\n");
|
|
return;
|
|
#else
|
|
if (lseek (corechan, uaddr, 0) < 0)
|
|
perror_with_name ("seek on core file");
|
|
if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
|
|
perror_with_name ("read from core file");
|
|
skip = 0;
|
|
#endif
|
|
}
|
|
|
|
fpstatep = (struct fpstate *)(buf + skip);
|
|
print_387_status (fpstatep->sv_ex_sw, (struct env387 *)fpstatep);
|
|
}
|
|
|
|
#ifdef SETUP_ARBITRARY_FRAME
|
|
FRAME
|
|
setup_arbitrary_frame (numargs, args)
|
|
int numargs;
|
|
unsigned int *args;
|
|
{
|
|
if (numargs > 2)
|
|
error ("Too many args in frame specification");
|
|
return create_new_frame ((CORE_ADDR)args[0], (CORE_ADDR)args[1]);
|
|
}
|
|
#endif
|
|
|
|
#ifdef KERNEL_DEBUG
|
|
#include <sys/proc.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
|
|
#include <machine/vmparam.h>
|
|
#include <machine/pcb.h>
|
|
|
|
#define KERNOFF ((unsigned)KERNBASE)
|
|
#define INKERNEL(x) ((x) >= KERNOFF)
|
|
|
|
static CORE_ADDR sbr;
|
|
static CORE_ADDR curpcb;
|
|
static CORE_ADDR kstack;
|
|
static int found_pcb;
|
|
static int devmem;
|
|
static int kfd;
|
|
static struct pcb pcb;
|
|
int read_pcb (int, CORE_ADDR);
|
|
static CORE_ADDR kvtophys (int, CORE_ADDR);
|
|
static physrd(int, u_int, char*, int);
|
|
|
|
extern CORE_ADDR ksym_lookup(const char *);
|
|
|
|
/* substitutes for the stuff in libkvm which doesn't work */
|
|
/* most of this was taken from the old kgdb */
|
|
|
|
/* we don't need all this stuff, but the call should look the same */
|
|
kvm_open (efile, cfile, sfile, perm, errout)
|
|
char *efile;
|
|
char *cfile;
|
|
void *sfile;
|
|
int perm;
|
|
int errout;
|
|
{
|
|
struct stat stb;
|
|
CORE_ADDR addr;
|
|
int cfd;
|
|
|
|
if ((cfd = open(cfile, perm, 0)) < 0)
|
|
return (cfd);
|
|
|
|
fstat(cfd, &stb);
|
|
if ((stb.st_mode & S_IFMT) == S_IFCHR && stb.st_rdev == makedev(2, 0)) {
|
|
devmem = 1;
|
|
kfd = open ("/dev/kmem", perm, 0);
|
|
}
|
|
|
|
physrd(cfd, ksym_lookup("IdlePTD") - KERNOFF, (char*)&sbr, sizeof sbr);
|
|
printf("IdlePTD %x\n", sbr);
|
|
curpcb = ksym_lookup("curpcb") - KERNOFF;
|
|
physrd(cfd, curpcb, (char*)&curpcb, sizeof curpcb);
|
|
kstack = ksym_lookup("kstack");
|
|
|
|
found_pcb = 1; /* for vtophys */
|
|
if (!devmem)
|
|
read_pcb(cfd, ksym_lookup("dumppcb") - KERNOFF);
|
|
else
|
|
read_pcb(cfd, kvtophys(cfd, kstack));
|
|
|
|
return (cfd);
|
|
}
|
|
|
|
kvm_close (fd)
|
|
{
|
|
return (close (fd));
|
|
}
|
|
|
|
kvm_write(core_kd, memaddr, myaddr, len)
|
|
CORE_ADDR memaddr;
|
|
char *myaddr;
|
|
{
|
|
int cc;
|
|
|
|
if (devmem) {
|
|
if (kfd > 0) {
|
|
/*
|
|
* Just like kvm_read, only we write.
|
|
*/
|
|
errno = 0;
|
|
if (lseek(kfd, (off_t)memaddr, 0) < 0 && errno != 0) {
|
|
error("kvm_write:invalid address (%x)", memaddr);
|
|
return (0);
|
|
}
|
|
cc = write(kfd, myaddr, len);
|
|
if (cc < 0) {
|
|
error("kvm_write:write failed");
|
|
return (0);
|
|
} else if (cc < len)
|
|
error("kvm_write:short write");
|
|
return (cc);
|
|
} else
|
|
return (0);
|
|
} else {
|
|
printf("kvm_write not implemented for dead kernels\n");
|
|
return (0);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
kvm_read(core_kd, memaddr, myaddr, len)
|
|
CORE_ADDR memaddr;
|
|
char *myaddr;
|
|
{
|
|
return (kernel_core_file_hook (core_kd, memaddr, myaddr, len));
|
|
}
|
|
|
|
kvm_uread(core_kd, p, memaddr, myaddr, len)
|
|
register struct proc *p;
|
|
CORE_ADDR memaddr;
|
|
char *myaddr;
|
|
{
|
|
register char *cp;
|
|
char procfile[MAXPATHLEN];
|
|
ssize_t amount;
|
|
int fd;
|
|
|
|
if (devmem) {
|
|
cp = myaddr;
|
|
|
|
sprintf(procfile, "/proc/%d/mem", p->p_pid);
|
|
fd = open(procfile, O_RDONLY, 0);
|
|
|
|
if (fd < 0) {
|
|
error("cannot open %s", procfile);
|
|
close(fd);
|
|
return (0);
|
|
}
|
|
|
|
while (len > 0) {
|
|
if (lseek(fd, memaddr, 0) == -1 && errno != 0) {
|
|
error("invalid address (%x) in %s",
|
|
memaddr, procfile);
|
|
break;
|
|
}
|
|
amount = read(fd, cp, len);
|
|
if (amount < 0) {
|
|
error("error reading %s", procfile);
|
|
break;
|
|
}
|
|
cp += amount;
|
|
memaddr += amount;
|
|
len -= amount;
|
|
}
|
|
|
|
close(fd);
|
|
return (ssize_t)(cp - myaddr);
|
|
} else {
|
|
return (kernel_core_file_hook (core_kd, memaddr, myaddr, len));
|
|
}
|
|
}
|
|
|
|
static
|
|
physrd(cfd, addr, dat, len)
|
|
u_int addr;
|
|
char *dat;
|
|
{
|
|
if (lseek(cfd, (off_t)addr, L_SET) == -1)
|
|
return (-1);
|
|
return (read(cfd, dat, len));
|
|
}
|
|
|
|
static CORE_ADDR
|
|
kvtophys (fd, addr)
|
|
CORE_ADDR addr;
|
|
{
|
|
CORE_ADDR v;
|
|
struct pte pte;
|
|
static CORE_ADDR PTD = -1;
|
|
CORE_ADDR current_ptd;
|
|
|
|
/*if (devmem && kfd > 0)
|
|
return (addr);
|
|
/*
|
|
* If we're looking at the kernel stack,
|
|
* munge the address to refer to the user space mapping instead;
|
|
* that way we get the requested process's kstack, not the running one.
|
|
*/
|
|
if (addr >= kstack && addr < kstack + ctob(UPAGES))
|
|
addr = (addr - kstack) + curpcb;
|
|
|
|
/*
|
|
* We may no longer have a linear system page table...
|
|
*
|
|
* Here's the scoop. IdlePTD contains the physical address
|
|
* of a page table directory that always maps the kernel.
|
|
* IdlePTD is in memory that is mapped 1-to-1, so we can
|
|
* find it easily given its 'virtual' address from ksym_lookup().
|
|
* For hysterical reasons, the value of IdlePTD is stored in sbr.
|
|
*
|
|
* To look up a kernel address, we first convert it to a 1st-level
|
|
* address and look it up in IdlePTD. This gives us the physical
|
|
* address of a page table page; we extract the 2nd-level part of
|
|
* VA and read the 2nd-level pte. Finally, we add the offset part
|
|
* of the VA into the physical address from the pte and return it.
|
|
*
|
|
* User addresses are a little more complicated. If we don't have
|
|
* a current PCB from read_pcb(), we use PTD, which is the (fixed)
|
|
* virtual address of the current ptd. Since it's NOT in 1-to-1
|
|
* kernel space, we must look it up using IdlePTD. If we do have
|
|
* a pcb, we get the ptd from pcb_ptd.
|
|
*/
|
|
|
|
if (INKERNEL(addr))
|
|
current_ptd = sbr;
|
|
else if (found_pcb == 0) {
|
|
if (PTD == -1)
|
|
PTD = kvtophys(fd, ksym_lookup("PTD"));
|
|
current_ptd = PTD;
|
|
} else
|
|
current_ptd = pcb.pcb_ptd;
|
|
|
|
/*
|
|
* Read the first-level page table (ptd).
|
|
*/
|
|
v = current_ptd + ((unsigned)addr >> PD_SHIFT) * sizeof pte;
|
|
if (physrd(fd, v, (char *)&pte, sizeof pte) < 0 || pte.pg_v == 0)
|
|
return (~0);
|
|
|
|
/*
|
|
* Read the second-level page table.
|
|
*/
|
|
v = i386_ptob(pte.pg_pfnum) + ((addr&PT_MASK) >> PG_SHIFT) * sizeof pte;
|
|
if (physrd(fd, v, (char *) &pte, sizeof(pte)) < 0 || pte.pg_v == 0)
|
|
return (~0);
|
|
|
|
addr = i386_ptob(pte.pg_pfnum) + (addr & PGOFSET);
|
|
#if 0
|
|
printf("vtophys(%x) -> %x\n", oldaddr, addr);
|
|
#endif
|
|
return (addr);
|
|
}
|
|
|
|
read_pcb (fd, uaddr)
|
|
CORE_ADDR uaddr;
|
|
{
|
|
int i;
|
|
int *pcb_regs = (int *)&pcb;
|
|
int eip;
|
|
|
|
if (physrd(fd, uaddr, (char *)&pcb, sizeof pcb) < 0) {
|
|
error("cannot read pcb at %x\n", uaddr);
|
|
return (-1);
|
|
}
|
|
printf("current pcb at %x\n", uaddr);
|
|
|
|
/*
|
|
* get the register values out of the sys pcb and
|
|
* store them where `read_register' will find them.
|
|
*/
|
|
for (i = 0; i < 8; ++i)
|
|
supply_register(i, &pcb_regs[i+10]);
|
|
supply_register(8, &pcb_regs[8]); /* eip */
|
|
supply_register(9, &pcb_regs[9]); /* eflags */
|
|
for (i = 10; i < 13; ++i) /* cs, ss, ds */
|
|
supply_register(i, &pcb_regs[i+9]);
|
|
supply_register(13, &pcb_regs[18]); /* es */
|
|
for (i = 14; i < 16; ++i) /* fs, gs */
|
|
supply_register(i, &pcb_regs[i+8]);
|
|
|
|
#if 0 /* doesn't work ??? */
|
|
/* Hmm... */
|
|
if (target_read_memory(pcb_regs[5+10]+4, &eip, sizeof eip, 0))
|
|
error("Cannot read PC.");
|
|
supply_register(8, &eip); /* eip */
|
|
#endif
|
|
|
|
/* XXX 80387 registers? */
|
|
}
|
|
|
|
/*
|
|
* read len bytes from kernel virtual address 'addr' into local
|
|
* buffer 'buf'. Return numbert of bytes if read ok, 0 otherwise. On read
|
|
* errors, portion of buffer not read is zeroed.
|
|
*/
|
|
kernel_core_file_hook(fd, addr, buf, len)
|
|
CORE_ADDR addr;
|
|
char *buf;
|
|
int len;
|
|
{
|
|
int i;
|
|
CORE_ADDR paddr;
|
|
register char *cp;
|
|
int cc;
|
|
|
|
cp = buf;
|
|
|
|
while (len > 0) {
|
|
paddr = kvtophys(fd, addr);
|
|
if (paddr == ~0) {
|
|
bzero(buf, len);
|
|
break;
|
|
}
|
|
/* we can't read across a page boundary */
|
|
i = min(len, NBPG - (addr & PGOFSET));
|
|
if ((cc = physrd(fd, paddr, cp, i)) <= 0) {
|
|
bzero(cp, len);
|
|
return (cp - buf);
|
|
}
|
|
cp += cc;
|
|
addr += cc;
|
|
len -= cc;
|
|
}
|
|
return (cp - buf);
|
|
}
|
|
#endif /* KERNEL_DEBUG */
|