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- /*-
- * 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 *) ®isters[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 *) ®isters[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
- }
-