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BSD 4_3_Net_2 release
[unix-history] / usr / src / usr.bin / gdb / config / hp300bsd-dep.c
/*-
* This code is derived from software copyrighted by the Free Software
* Foundation.
*
* Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
* Modified 1990 by Van Jacobson at Lawrence Berkeley Laboratory.
*/
#ifndef lint
static char sccsid[] = "@(#)hp300bsd-dep.c 6.10 (Berkeley) 5/12/91";
#endif /* not lint */
/*
* Machine-dependent code for a Hewlett-Packard 9000/300, running bsd.
* Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
*
* This file is part of GDB.
*
* GDB 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 1, or (at your option) any later version.
*
* GDB 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
* GDB; see the file COPYING. If not, write to the Free Software Foundation,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef lint
static char rcsid[] = "$Header: hp300bsd-dep.c,v 1.6 91/03/13 01:04:43 mccanne Exp $";
#endif lint
#include <stdio.h>
#include "defs.h"
#include "param.h"
#include "frame.h"
#include "inferior.h"
#include "value.h"
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/ioctl.h>
/* #include <fcntl.h> Can we live without this? */
#include <a.out.h>
#ifndef N_SET_MAGIC
#define N_SET_MAGIC(exec, val) ((exec).a_magic = (val))
#endif
#ifdef NEWVM
#include <hp300/hp300/pte.h>
#endif
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/uio.h>
#include <sys/user.h> /* After a.out.h */
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/ptrace.h>
CORE_ADDR kernel_u_addr;
#ifdef KERNELDEBUG
#ifndef NEWVM
#include <sys/vmmac.h>
#include <machine/pte.h>
#endif
#include <machine/vmparam.h>
#include <machine/cpu.h>
#include <ctype.h>
#include "symtab.h" /* XXX */
extern int kernel_debugging;
#define KERNOFF ((unsigned)KERNBASE)
#define LOWRAM ((unsigned)0xfffffdce)
/* actually you can't really distinguish user and kernel by address */
#define INKERNEL(x) ((x) >= KERNOFF && (x) < KERNOFF + ctob(slr))
#define INUDOT(x) \
((x) >= KERNEL_U_ADDR && (x) < KERNEL_U_ADDR + ctob(UPAGES))
#define PT_ADDR_ANY ((caddr_t) 1)
/*
* Convert from sysmap pte index to system virtual address & vice-versa.
* (why aren't these in one of the system vm macro files???)
*/
#define smxtob(a) (sbr + (a) * sizeof(pte))
#define btosmx(b) (((b) - sbr) / sizeof(pte))
static int ok_to_cache();
#ifdef NEWVM
static int found_pcb;
static CORE_ADDR curpcb;
static CORE_ADDR kstack;
#endif
#endif
extern int errno;
/*
* This function simply calls ptrace with the given arguments. It exists so
* that all calls to ptrace are isolated in this machine-dependent file.
*/
int
call_ptrace(request, pid, arg3, arg4)
int request;
pid_t pid;
caddr_t arg3;
int arg4;
{
return(ptrace(request, pid, arg3, arg4));
}
kill_inferior()
{
if (remote_debugging) {
#ifdef KERNELDEBUG
if (kernel_debugging)
/*
* It's a very, very bad idea to go away leaving
* breakpoints in a remote kernel or to leave it
* stopped at a breakpoint.
*/
clear_breakpoints();
#endif
remote_close(0);
inferior_died();
} else if (inferior_pid != 0) {
ptrace(PT_KILL, inferior_pid, 0, 0);
wait(0);
inferior_died();
}
}
/*
* This is used when GDB is exiting. It gives less chance of error.
*/
kill_inferior_fast()
{
if (remote_debugging) {
#ifdef KERNELDEBUG
if (kernel_debugging)
clear_breakpoints();
#endif
remote_close(0);
return;
}
if (inferior_pid == 0)
return;
ptrace(PT_KILL, inferior_pid, 0, 0);
wait(0);
}
/*
* Resume execution of the inferior process. If STEP is nonzero, single-step
* it. If SIGNAL is nonzero, give it that signal.
*/
void
resume(step, signal)
int step;
int signal;
{
errno = 0;
if (remote_debugging)
remote_resume(step, signal);
else {
ptrace(step ? PT_STEP : PT_CONTINUE, inferior_pid,
PT_ADDR_ANY, signal);
if (errno)
perror_with_name("ptrace");
}
}
#ifdef ATTACH_DETACH
extern int attach_flag;
/*
* Start debugging the process whose number is PID.
*/
attach(pid)
int pid;
{
errno = 0;
ptrace(PT_ATTACH, pid, 0, 0);
if (errno)
perror_with_name("ptrace");
attach_flag = 1;
return pid;
}
/*
* Stop debugging the process whose number is PID and continue it
* with signal number SIGNAL. SIGNAL = 0 means just continue it.
*/
void
detach(signal)
int signal;
{
errno = 0;
ptrace(PT_DETACH, inferior_pid, PT_ADDR_ANY, signal);
if (errno)
perror_with_name("ptrace");
attach_flag = 0;
}
#endif /* ATTACH_DETACH */
static unsigned int
get_register_offset()
{
unsigned int offset;
struct user u; /* XXX */
#ifdef NEWVM
offset = (char *) &u.u_kproc.kp_proc.p_regs - (char *) &u;
offset = ptrace(PT_READ_U, inferior_pid, (caddr_t)offset, 0) -
USRSTACK;
#else
offset = (char *) &u.u_ar0 - (char *) &u;
offset = ptrace(PT_READ_U, inferior_pid, (caddr_t)offset, 0) -
KERNEL_U_ADDR;
#endif
return offset;
}
void
fetch_inferior_registers()
{
register int regno;
register unsigned int regaddr;
char buf[MAX_REGISTER_RAW_SIZE];
register int i;
unsigned int offset;
if (remote_debugging) {
extern char registers[];
remote_fetch_registers(registers);
return;
}
offset = get_register_offset();
for (regno = 0; regno < NUM_REGS; regno++) {
regaddr = register_addr(regno, offset);
for (i = 0; i < REGISTER_RAW_SIZE(regno); i += sizeof(int)) {
*(int *)&buf[i] = ptrace(PT_READ_U, inferior_pid,
(caddr_t)regaddr, 0);
regaddr += sizeof(int);
}
supply_register(regno, buf);
}
}
/*
* Store our register values back into the inferior. If REGNO is -1, do this
* for all registers. Otherwise, REGNO specifies which register (so we can
* save time).
*/
store_inferior_registers(regno)
int regno;
{
register unsigned int regaddr;
char buf[80];
extern char registers[];
register int i;
unsigned int offset;
if (remote_debugging) {
extern char registers[];
remote_store_registers(registers);
return;
}
offset = get_register_offset();
if (regno >= 0) {
regaddr = register_addr(regno, offset);
for (i = 0; i < REGISTER_RAW_SIZE(regno); i += sizeof(int)) {
errno = 0;
ptrace(PT_WRITE_U, inferior_pid, (caddr_t)regaddr,
*(int *) &registers[REGISTER_BYTE(regno) + i]);
if (errno != 0) {
sprintf(buf, "writing register number %d(%d)",
regno, i);
perror_with_name(buf);
}
regaddr += sizeof(int);
}
} else
for (regno = 0; regno < NUM_REGS; regno++) {
regaddr = register_addr(regno, offset);
for (i = 0; i < REGISTER_RAW_SIZE(regno);
i += sizeof(int)) {
errno = 0;
ptrace(PT_WRITE_U, inferior_pid,
(caddr_t)regaddr,
*(int *) &registers[REGISTER_BYTE(regno) + i]);
if (errno != 0) {
sprintf(buf,
"writing register number %d(%d)",
regno, i);
perror_with_name(buf);
}
regaddr += sizeof(int);
}
}
}
/*
* Copy LEN bytes from inferior's memory starting at MEMADDR to debugger
* memory starting at MYADDR. On failure (cannot read from inferior, usually
* because address is out of bounds) returns the value of errno.
*/
int
read_inferior_memory(memaddr, myaddr, len)
CORE_ADDR memaddr;
char *myaddr;
int len;
{
register int i;
/* Round starting address down to longword boundary. */
register CORE_ADDR addr = memaddr & -sizeof(int);
/* Round ending address up; get number of longwords that makes. */
register int count = (((memaddr + len) - addr) + sizeof(int) - 1) /
sizeof(int);
/* Allocate buffer of that many longwords. */
register int *buffer = (int *) alloca(count * sizeof(int));
extern int errno;
if (remote_debugging)
return (remote_read_inferior_memory(memaddr, myaddr, len));
/* Read all the longwords */
errno = 0;
for (i = 0; i < count && errno == 0; i++, addr += sizeof(int))
buffer[i] = ptrace(PT_READ_I, inferior_pid, (caddr_t)addr, 0);
/* Copy appropriate bytes out of the buffer. */
bcopy((char *) buffer + (memaddr & (sizeof(int) - 1)), myaddr, len);
return(errno);
}
/*
* Copy LEN bytes of data from debugger memory at MYADDR to inferior's memory
* at MEMADDR. On failure (cannot write the inferior) returns the value of
* errno.
*/
int
write_inferior_memory(memaddr, myaddr, len)
CORE_ADDR memaddr;
char *myaddr;
int len;
{
register int i;
/* Round starting address down to longword boundary. */
register CORE_ADDR addr = memaddr & -sizeof(int);
/* Round ending address up; get number of longwords that makes. */
register int count = (((memaddr + len) - addr) + sizeof(int) - 1) /
sizeof(int);
/* Allocate buffer of that many longwords. */
register int *buffer = (int *) alloca(count * sizeof(int));
extern int errno;
/*
* Fill start and end extra bytes of buffer with existing memory
* data.
*/
if (remote_debugging)
return (remote_write_inferior_memory(memaddr, myaddr, len));
/*
* Fill start and end extra bytes of buffer with existing memory
* data.
*/
buffer[0] = ptrace(PT_READ_I, inferior_pid, (caddr_t)addr, 0);
if (count > 1)
buffer[count - 1] = ptrace(PT_READ_I, inferior_pid,
(caddr_t)addr + (count - 1) * sizeof(int), 0);
/* Copy data to be written over corresponding part of buffer */
bcopy(myaddr, (char *) buffer + (memaddr & (sizeof(int) - 1)), len);
/* Write the entire buffer. */
errno = 0;
for (i = 0; i < count && errno == 0; i++, addr += sizeof(int))
ptrace(PT_WRITE_I, inferior_pid, (caddr_t)addr, buffer[i]);
return(errno);
}
/*
* Work with core dump and executable files, for GDB.
* This code would be in core.c if it weren't machine-dependent.
*/
#ifndef N_TXTADDR
#define N_TXTADDR(hdr) 0
#endif /* no N_TXTADDR */
#ifndef N_DATADDR
#define N_DATADDR(hdr) hdr.a_text
#endif /* no N_DATADDR */
/*
* Make COFF and non-COFF names for things a little more compatible to reduce
* conditionals later.
*/
#ifndef AOUTHDR
#define AOUTHDR struct exec
#endif
extern char *sys_siglist[];
/* Hook for `exec_file_command' command to call. */
extern void (*exec_file_display_hook) ();
/* File names of core file and executable file. */
extern char *corefile;
extern char *execfile;
/* Descriptors on which core file and executable file are open.
Note that the execchan is closed when an inferior is created
and reopened if the inferior dies or is killed. */
extern int corechan;
extern int execchan;
/* Last modification time of executable file.
Also used in source.c to compare against mtime of a source file. */
extern int exec_mtime;
/* Virtual addresses of bounds of the two areas of memory in the core file. */
extern CORE_ADDR data_start;
extern CORE_ADDR data_end;
extern CORE_ADDR stack_start;
extern CORE_ADDR stack_end;
/* Virtual addresses of bounds of two areas of memory in the exec file.
Note that the data area in the exec file is used only when there is no core file. */
extern CORE_ADDR text_start;
extern CORE_ADDR text_end;
extern CORE_ADDR exec_data_start;
extern CORE_ADDR exec_data_end;
/* Address in executable file of start of text area data. */
extern int text_offset;
/* Address in executable file of start of data area data. */
extern int exec_data_offset;
/* Address in core file of start of data area data. */
extern int data_offset;
/* Address in core file of start of stack area data. */
extern int stack_offset;
/* a.out header saved in core file. */
extern AOUTHDR core_aouthdr;
/* a.out header of exec file. */
extern AOUTHDR exec_aouthdr;
extern void validate_files();
extern int (*core_file_hook)();
#ifdef KERNELDEBUG
/*
* Kernel debugging routines.
*/
static CORE_ADDR file_offset;
static CORE_ADDR lowram;
static CORE_ADDR sbr;
static CORE_ADDR slr;
static struct pcb pcb;
static CORE_ADDR kernel_udot_va;
#ifndef CFSIZE
#include <machine/frame.h>
#endif
static CORE_ADDR
ksym_lookup(name)
char *name;
{
struct symbol *sym;
int i;
if ((i = lookup_misc_func(name)) < 0)
error("kernel symbol `%s' not found.", name);
return (misc_function_vector[i].address);
}
/*
* return true if 'len' bytes starting at 'addr' can be read out as
* longwords and/or locally cached (this is mostly for memory mapped
* i/o register access when debugging remote kernels).
*/
static int
ok_to_cache(addr, len)
{
#ifdef NEWVM
static CORE_ADDR intiobase, extiobase;
if (! intiobase) {
intiobase = ksym_lookup("intiobase");
(void)remote_read_inferior_memory(intiobase, &intiobase,
sizeof(intiobase));
extiobase = ksym_lookup("extiobase");
(void)remote_read_inferior_memory(extiobase, &extiobase,
sizeof(extiobase));
}
if (addr >= intiobase && addr < intiobase + ctob(IIOMAPSIZE))
return (0);
if (addr >= extiobase && addr < extiobase + ctob(EIOMAPSIZE))
return (0);
#else
static CORE_ADDR IObase;
if (! IObase)
IObase = ksym_lookup("IObase");
if (addr >= IObase && addr < IObase + (IOTOP - IOBASE))
return (0);
#endif
return (1);
}
static
physrd(addr, dat, len)
u_int addr;
char *dat;
{
if (lseek(corechan, addr - file_offset, L_SET) == -1)
return (-1);
if (read(corechan, dat, len) != len)
return (-1);
return (0);
}
/*
* When looking at kernel data space through /dev/mem or with a core file, do
* virtual memory mapping.
*/
#ifdef NEWVM
static CORE_ADDR
vtophys(addr)
CORE_ADDR addr;
{
CORE_ADDR v;
struct pte pte;
CORE_ADDR stp;
CORE_ADDR oldaddr = addr;
static CORE_ADDR curstp = -1;
/*
* 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;
/*
* Identify the current segment table.
* Since the given VA could come from either kernel
* or user space, the following heuristics don't always work.
*/
if (INKERNEL(addr))
stp = sbr;
else if (found_pcb == 0) {
/* We have a pcb address, but haven't read it yet. Cheat. */
if (curstp == -1) {
v = vtophys((CORE_ADDR)&((struct pcb *)curpcb)->pcb_ustp);
physrd(v, &curstp, sizeof curstp);
}
stp = curstp;
} else
stp = pcb.pcb_ustp;
/*
* Read the current segment table.
*/
v = stp + ((addr >> SG_ISHIFT) * sizeof pte);
if (physrd(v, (char *)&pte, sizeof(pte)))
return (~0);
if (*(int *)&pte == SG_NV)
return (~0);
v = hp300_btop(addr & SG_PMASK);
addr = (CORE_ADDR)(hp300_ptob(pte.pg_pfnum) + v*sizeof pte);
/*
* Addr is now address of the pte of the page we are interested in;
* get the pte and paste up the physical address.
*/
if (physrd(addr, (char *) &pte, sizeof(pte)))
return (~0);
if (pte.pg_v == 0 && pte.pg_pfnum == 0)
return (~0);
addr = (CORE_ADDR)hp300_ptob(pte.pg_pfnum) + (oldaddr & PGOFSET);
#if 0
printf("vtophys(%x) -> %x\n", oldaddr, addr);
#endif
return (addr);
}
#else
static CORE_ADDR
vtophys(addr)
CORE_ADDR addr;
{
CORE_ADDR v;
struct pte pte;
CORE_ADDR oldaddr = addr;
/* permit direct reference to physical memory */
if (addr >= lowram)
return (addr);
if (kernel_udot_va && INUDOT(addr)) {
addr -= KERNEL_U_ADDR;
addr = kernel_udot_va + btop(addr) * sizeof (struct pte);
addr = vtophys(addr);
} else if (INKERNEL(addr)) {
/*
* In system space get system pte. If valid or reclaimable
* then physical address is combination of its page number
* and the page offset of the original address.
*/
v = smxtob(btop(addr - KERNOFF));
addr = v + lowram;
} else {
/* In p0 space must not be off end of region. */
v = btop(addr);
if (v >= pcb.pcb_p0lr)
/* address out of segment */
return (~0);
addr = (CORE_ADDR)(pcb.pcb_p0br + v);
/*
* For p0/p1 address, user-level page table should be in
* kernel vm. Do second-level indirect by recursing.
*/
if (!INKERNEL(addr))
return (~0);
addr = vtophys(addr);
}
/*
* Addr is now address of the pte of the page we are interested in;
* get the pte and paste up the physical address.
*/
if (physrd(addr, (char *) &pte, sizeof(pte)))
return (~0);
if (pte.pg_v == 0 && (pte.pg_fod || pte.pg_pfnum == 0))
return (~0);
addr = (CORE_ADDR)ptob(pte.pg_pfnum) + (oldaddr & PGOFSET);
#if 0
printf("vtophys(%x) -> %x\n", oldaddr, addr);
#endif
return (addr);
}
#endif
static
kvread(addr)
CORE_ADDR addr;
{
CORE_ADDR paddr = vtophys(addr);
if (paddr != ~0)
if (physrd(paddr, (char *)&addr, sizeof(addr)) == 0);
return (addr);
return (~0);
}
static void
read_pcb(uaddr)
u_int uaddr;
{
int i;
#ifdef NEWVM
if (physrd(uaddr, (char *)&pcb, sizeof pcb))
error("cannot read pcb at %x\n", uaddr);
printf("current pcb at %x\n", uaddr);
#else
if (physrd (uaddr, (char *)&pcb, sizeof pcb))
error ("cannot read pcb at %x.\n", uaddr);
printf("p0br %x p0lr %x p1br %x p1lr %x\n",
pcb.pcb_p0br, pcb.pcb_p0lr, pcb.pcb_p1br, pcb.pcb_p1lr);
kernel_udot_va = (CORE_ADDR) (pcb.pcb_p1br + BTOPUSRSTACK);
#endif
/*
* get the register values out of the sys pcb and
* store them where `read_register' will find them.
*/
for (i = 2; i < 8; ++i)
supply_register(i, &pcb.pcb_regs[i-2]);
for (i = 10; i < 16; ++i)
supply_register(i, &pcb.pcb_regs[i-4]);
/* fake 'scratch' regs d0, d1, a0, a1 */
i = 0;
supply_register(0, &i); supply_register(1, &i);
supply_register(8, &i); supply_register(9, &i);
i = kvread(pcb.pcb_regs[10] + 4);
if (i != -1)
supply_register(PC_REGNUM, &i);
supply_register(PS_REGNUM, &pcb.pcb_ps);
for (i = FP0_REGNUM; i < NUM_REGS; ++i) {
int fpreg;
REGISTER_U_ADDR(fpreg, 0, i);
supply_register(i, ((char *)&pcb) + fpreg);
}
}
static void
setup_kernel_debugging()
{
struct stat stb;
int devmem = 0;
CORE_ADDR addr;
fstat(corechan, &stb);
if ((stb.st_mode & S_IFMT) == S_IFCHR && stb.st_rdev == makedev(2, 0))
devmem = 1;
/*
* Must get value of lowram before we can read PCB.
*/
if (devmem)
/* /dev/mem == physical memory */
(void)physrd(LOWRAM, (char *)&lowram, sizeof(lowram));
else
/* normal file -- use standard offset */
(void)physrd(ksym_lookup("lowram"), (char *)&lowram,
sizeof(lowram));
lowram = roundup(lowram, NBPG);
if (! devmem)
file_offset = lowram;
/*
* Get system mapping information.
*/
#ifdef NEWVM
sbr = ksym_lookup("Sysseg") + lowram;
(void)physrd(sbr, (char *)&sbr, sizeof(sbr));
sbr += lowram; /* sbr is a physical address for NEWVM */
slr = NPTEPG * (NPTEPG-1);
curpcb = ksym_lookup("curpcb") + lowram;
physrd(curpcb, &curpcb, sizeof curpcb);
kstack = ksym_lookup("kstack");
#else
sbr = ksym_lookup("Sysmap");
slr = ksym_lookup("Syssize");
#endif
printf("sbr %x slr %x\n", sbr, slr);
/*
* pcb where "panic" saved registers in first thing in current
* u area.
*/
#ifdef NEWVM
read_pcb(vtophys(kstack));
found_pcb = 1;
#else
read_pcb(vtophys(ksym_lookup("u")));
#endif
if (!devmem) {
/* find stack frame */
CORE_ADDR panicstr;
char buf[256];
register char *cp;
panicstr = kvread(ksym_lookup("panicstr"));
if (panicstr == ~0)
return;
(void) kernel_core_file_hook(panicstr, buf, sizeof(buf));
for (cp = buf; cp < &buf[sizeof(buf)] && *cp; cp++)
if (!isascii(*cp) || (!isprint(*cp) && !isspace(*cp)))
*cp = '?';
if (*cp)
*cp = '\0';
printf("panic: %s\n", buf);
}
stack_start = USRSTACK;
stack_end = USRSTACK + ctob(UPAGES);
}
set_paddr_command(arg)
char *arg;
{
u_int uaddr;
if (!arg)
error_no_arg("ps-style address for new current process");
if (!kernel_debugging)
error("not debugging kernel");
if (lowram == 0)
error("need kernel core file");
uaddr = (u_int) parse_and_eval_address(arg);
#ifndef NEWVM
read_pcb(ctob(uaddr));
#else
/* p_addr is now a pcb virtual address */
read_pcb(vtophys(uaddr));
curpcb = uaddr;
#endif
flush_cached_frames();
set_current_frame(create_new_frame(read_register(FP_REGNUM), read_pc()));
select_frame(get_current_frame(), 0);
}
/*
* read len bytes from kernel virtual address 'addr' into local
* buffer 'buf'. Return 0 if read ok, 1 otherwise. On read
* errors, portion of buffer not read is zeroed.
*/
kernel_core_file_hook(addr, buf, len)
CORE_ADDR addr;
char *buf;
int len;
{
int i;
CORE_ADDR paddr;
while (len > 0) {
paddr = vtophys(addr);
if (paddr == ~0) {
bzero(buf, len);
return (1);
}
/* we can't read across a page boundary */
i = min(len, NBPG - (addr & PGOFSET));
if (physrd(paddr, buf, i)) {
bzero(buf, len);
return (1);
}
buf += i;
addr += i;
len -= i;
}
return (0);
}
#endif
core_file_command(filename, from_tty)
char *filename;
int from_tty;
{
int val;
extern char registers[];
unsigned int reg_offset;
#ifdef KERNELDEBUG
struct stat stb;
#endif
struct user u;
/*
* Discard all vestiges of any previous core file and mark data and
* stack spaces as empty.
*/
if (corefile)
free(corefile);
corefile = 0;
core_file_hook = 0;
if (corechan >= 0)
close(corechan);
corechan = -1;
/* Now, if a new core file was specified, open it and digest it. */
if (filename == 0) {
if (from_tty)
printf("No core file now.\n");
return;
}
filename = tilde_expand(filename);
make_cleanup(free, filename);
if (have_inferior_p())
error("To look at a core file, you must kill the inferior with \"kill\".");
corechan = open(filename, O_RDONLY, 0);
if (corechan < 0)
perror_with_name(filename);
#ifdef KERNELDEBUG
fstat(corechan, &stb);
if (kernel_debugging) {
setup_kernel_debugging();
core_file_hook = kernel_core_file_hook;
} else if ((stb.st_mode & S_IFMT) == S_IFCHR &&
stb.st_rdev == makedev(2, 1)) {
/* looking at /dev/kmem */
data_offset = data_start = KERNOFF;
data_end = ~0; /* XXX */
stack_end = stack_start = data_end;
} else
#endif
{
val = myread(corechan, &u, sizeof u);
if (val < 0)
perror_with_name("Not a core file: reading upage");
if (val != sizeof u)
error("Not a core file: could only read %d bytes", val);
/*
* We are depending on exec_file_command having been
* called previously to set exec_data_start. Since
* the executable and the core file share the same
* text segment, the address of the data segment will
* be the same in both.
*/
data_start = exec_data_start;
#ifndef NEWVM
data_end = data_start + NBPG * u.u_dsize;
stack_start = stack_end - NBPG * u.u_ssize;
data_offset = NBPG * UPAGES;
stack_offset = NBPG * (UPAGES + u.u_dsize);
/*
* Some machines put an absolute address in here and
* some put the offset in the upage of the regs.
*/
reg_offset = (int) u.u_ar0 - KERNEL_U_ADDR;
#else
data_end = data_start +
NBPG * u.u_kproc.kp_eproc.e_vm.vm_dsize;
stack_start = stack_end -
NBPG * u.u_kproc.kp_eproc.e_vm.vm_ssize;
data_offset = NBPG * UPAGES;
stack_offset = NBPG *
(UPAGES + u.u_kproc.kp_eproc.e_vm.vm_dsize);
reg_offset = (int) u.u_kproc.kp_proc.p_regs - USRSTACK;
#endif
/*
* I don't know where to find this info. So, for now,
* mark it as not available.
*/
N_SET_MAGIC(core_aouthdr, 0);
/*
* Read the register values out of the core file and
* store them where `read_register' will find them.
*/
{
register int regno;
for (regno = 0; regno < NUM_REGS; regno++) {
char buf[MAX_REGISTER_RAW_SIZE];
val = lseek(corechan, register_addr(regno, reg_offset), 0);
if (val < 0
|| (val = myread(corechan, buf, sizeof buf)) < 0) {
char *buffer = (char *) alloca(strlen(reg_names[regno]) + 30);
strcpy(buffer, "Reading register ");
strcat(buffer, reg_names[regno]);
perror_with_name(buffer);
}
supply_register(regno, buf);
}
}
}
if (filename[0] == '/')
corefile = savestring(filename, strlen(filename));
else
corefile = concat(current_directory, "/", filename);
set_current_frame(create_new_frame(read_register(FP_REGNUM),
read_pc()));
select_frame(get_current_frame(), 0);
validate_files();
}
exec_file_command(filename, from_tty)
char *filename;
int from_tty;
{
int val;
/*
* Eliminate all traces of old exec file. Mark text segment as empty.
*/
if (execfile)
free(execfile);
execfile = 0;
data_start = 0;
data_end -= exec_data_start;
text_start = 0;
text_end = 0;
exec_data_start = 0;
exec_data_end = 0;
if (execchan >= 0)
close(execchan);
execchan = -1;
/* Now open and digest the file the user requested, if any. */
if (filename) {
filename = tilde_expand(filename);
make_cleanup(free, filename);
execchan = openp(getenv("PATH"), 1, filename, O_RDONLY, 0,
&execfile);
if (execchan < 0)
perror_with_name(filename);
{
struct stat st_exec;
#ifdef HEADER_SEEK_FD
HEADER_SEEK_FD(execchan);
#endif
val = myread(execchan, &exec_aouthdr, sizeof(AOUTHDR));
if (val < 0)
perror_with_name(filename);
text_start = N_TXTADDR(exec_aouthdr);
exec_data_start = N_DATADDR(exec_aouthdr);
text_offset = N_TXTOFF(exec_aouthdr);
exec_data_offset = N_TXTOFF(exec_aouthdr) + exec_aouthdr.a_text;
text_end = text_start + exec_aouthdr.a_text;
exec_data_end = exec_data_start + exec_aouthdr.a_data;
data_start = exec_data_start;
data_end += exec_data_start;
fstat(execchan, &st_exec);
exec_mtime = st_exec.st_mtime;
}
validate_files();
} else if (from_tty)
printf("No exec file now.\n");
/* Tell display code (if any) about the changed file name. */
if (exec_file_display_hook)
(*exec_file_display_hook) (filename);
}
int dummy_code[] = {
0x4e714eb9, /* nop, jsr @#32323232 */
0x32323232,
#define DUMMY_CALL_INDEX 1
0x4e424e71, /* trap 2, nop */
};
/*
* Build `dummy' call instructions on inferior's stack to cause
* it to call a subroutine.
*
* N.B. - code in wait_for_inferior requires that sp < pc < fp when
* we take the trap 2 above so it will recognize that we stopped
* at a `dummy' call. So, after the call sp is *not* decremented
* to clean the arguments, code & other stuff we lay on the stack.
* Since the regs are restored to saved values at the breakpoint,
* sp will get reset correctly. Also, this restore means we don't
* have to construct frame linkage info to save pc & fp. The lack
* of frame linkage means we can't do a backtrace, etc., if the
* called function gets a fault or hits a breakpoint but code in
* run_stack_dummy makes this impossible anyway.
*/
CORE_ADDR
setup_dummy(sp, funaddr, nargs, args, struct_return_bytes, pushfn)
CORE_ADDR sp;
CORE_ADDR funaddr;
int nargs;
value *args;
int struct_return_bytes;
CORE_ADDR (*pushfn)();
{
int padding, i;
CORE_ADDR top = sp, struct_addr, pc;
i = arg_stacklen(nargs, args) + struct_return_bytes
+ sizeof(dummy_code);
if (i & 3)
padding = 4 - (i & 3);
else
padding = 0;
pc = sp - sizeof(dummy_code);
sp = pc - padding - struct_return_bytes;
struct_addr = sp;
while (--nargs >= 0)
sp = (*pushfn)(sp, *args++);
if (struct_return_bytes)
STORE_STRUCT_RETURN(struct_addr, sp);
write_register(SP_REGNUM, sp);
dummy_code[DUMMY_CALL_INDEX] = (int)funaddr;
write_memory(pc, (char *)dummy_code, sizeof(dummy_code));
return pc;
}
void
_initialize_hp300bsd_dep()
{
#ifdef KERNELDEBUG
add_com ("process-address", class_obscure, set_paddr_command,
"The process identified by (ps-style) ADDR becomes the\n\
\"current\" process context for kernel debugging.");
add_com_alias ("paddr", "process-address", class_obscure, 0);
#endif
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.