4.4BSD/usr/src/contrib/gdb-4.7.lbl/gdb/sparc-tdep.c
/*
* Copyright (c) 1992 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Lawrence Berkeley Laboratory,
* Berkeley, CA. The name of the University may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Target dependent code for a sparcstation running SunOS.
* This is mostly kernel debugging support.
* Common code is in sparc-tcmn.c.
*/
#ifndef lint
static char rcsid[] =
"@(#) $Header: sparc-tdep.c,v 1.2 93/02/19 15:25:07 mccanne Exp $ (LBL)";
#endif
#include <stdio.h>
#include "defs.h"
#include "frame.h"
#include "target.h"
#include <machine/reg.h>
#ifdef KERNELDEBUG
#include "kernel.h"
#include <kvm.h>
#include <sys/param.h>
#include <sys/dir.h>
#include <sys/user.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <fcntl.h>
extern int kernel_debugging;
extern CORE_ADDR ksym_lookup();
/*
* Read the "thing" at address 'addr' into the space pointed to by P.
* The length of the "thing" is determined by the type of P.
* Result is non-zero if transfer fails.
*/
#define READMEM(addr, p) \
(target_read_memory((CORE_ADDR)(addr), (char *)(p), sizeof(*(p))))
#endif
/*
* Return the address of the saved pc in frame.
*/
CORE_ADDR
addr_of_pc(frame)
struct frame_info *frame;
{
register CORE_ADDR addr;
register struct rwindow *rw;
#ifdef KERNELDEBUG
/*
* If we are kernel debugging, we must special case trap frames.
* We can tell if we are a trap frame by looking at the return
* address of the frame below us. If it is in locore, then
* we are such a frame and we can find our saved pc in %l1.
*/
if (kernel_debugging && frame->next) {
static CORE_ADDR locore_h, locore_t;
if (locore_h == 0) {
locore_h = ksym_lookup("sys_trap");
locore_t = ksym_lookup("kadb_tcode");
}
rw = (struct rwindow *)frame->next->bottom;
addr = read_memory_integer((CORE_ADDR)&rw->rw_in[7], 4);
if (addr > locore_h && addr < locore_t) {
rw = (struct rwindow *)frame->bottom;
return (CORE_ADDR)&rw->rw_local[1];
}
}
#endif
rw = (struct rwindow *)frame->bottom;
return (CORE_ADDR)&rw->rw_in[7];
}
#ifdef KERNELDEBUG
/*
* The code below implements kernel debugging of crashdumps (or /dev/kmem)
* or remote systems (via a serial link). For remote kernels, the remote
* context does most the work, so there is very little to do -- we just
* manage the kernel stack boundaries so we know where to stop a backtrace.
*
* The crashdump/kmem (kvm) support is a bit more grungy, but thanks to
* libkvm (see kcore.c) not too bad. The main work is kvm_fetch_registers
* which sucks the register state out of the current processes pcb.
* There is a command that let's you set the current process -- hopefully,
* to something that's blocked (in the live kernel case).
*/
/* XXX For misc_function_vector. */
#include "symtab.h"
/*
* Address ranges for the kernel interrupt stack (fixed) and the current
* process' kernel stack (dynamic).
*/
static CORE_ADDR intstack_top;
static CORE_ADDR intstack_bottom;
static CORE_ADDR kernstack_top;
static CORE_ADDR kernstack_bottom;
static struct proc *curproc;
void set_curproc();
/*
* Return true if ADDR is a valid stack address according to the
* current boundaries (which are determined by the currently running
* user process).
*/
int
inside_kernstack(addr)
CORE_ADDR addr;
{
if (curproc == 0)
set_curproc();
return (addr > intstack_bottom && addr < intstack_top) ||
(addr > kernstack_bottom && addr < kernstack_top);
}
/*
* (re-)set the variables that make inside_kernstack() work.
*/
void
set_kernel_boundaries(p)
struct proc *p;
{
CORE_ADDR kstack;
if (intstack_top == 0) {
intstack_top = ksym_lookup("eintstack");
intstack_bottom = ksym_lookup("intstack");
}
/*
* During boot, if masterprocp is still NULL the kernel
* stack lives in [ubasic..ubasic+KERNSTACK).
*/
if (p == NULL)
kstack = ksym_lookup("ubasic");
else {
if (READMEM(&p->p_segu, &kstack))
error("cannot read kernel stack pointer at %x\n",
&p->p_segu);
}
kernstack_bottom = kstack;
kernstack_top = kstack + KERNSTACK;
}
/*
* Return the current proc. masterprocp points to
* current proc which points to current u area.
*/
struct proc *
fetch_curproc()
{
struct proc *p;
static CORE_ADDR addr;
if (addr == 0)
addr = ksym_lookup("masterprocp");
if (READMEM(addr, &p))
error("cannot read proc pointer at %x\n", addr);
return p;
}
/*
* Called from remote_wait, after the remote kernel has stopped.
* Look up the current proc, and set up boundaries.
* This is for active kernels only.
*/
void
set_curproc()
{
curproc = fetch_curproc();
set_kernel_boundaries(curproc);
}
/*
* All code below is exclusively for support of kernel core files.
*/
/*
* Fetch registers from a crashdump or /dev/kmem.
*/
void
kvm_fetch_registers(p)
struct proc *p;
{
struct user *uaddr;
int i;
u_long cps, reg, sp;
float freg;
struct rwindow win;
struct pcb pcb;
/* find the pcb for the current process */
if (READMEM(&p->p_uarea, &uaddr))
error("cannot u area ptr for proc at 0x%x", p);
if (READMEM(&uaddr->u_pcb, &pcb))
error("cannot read pcb at 0x%x", &uaddr->u_pcb);
/*
* Invalidate all the registers then fill in the ones we know about.
*/
registers_changed();
sp = pcb.pcb_sp;
supply_register(SP_REGNUM, (char *)&pcb.pcb_sp);
supply_register(PC_REGNUM, (char *)&pcb.pcb_pc);
/* PC came from o7. */
supply_register(15, (char *)&pcb.pcb_pc);
supply_register(PS_REGNUM, (char *)&pcb.pcb_psr);
/* XXX There should be a WIM_REGNUM. */
supply_register(66, (char *)&pcb.pcb_uwm);
/*
* Read last register window saved on stack.
*/
if (READMEM(sp, &win)) {
printf("cannot read register window at sp=%x\n", pcb.pcb_sp);
bzero((char *)&win, sizeof win);
}
for (i = 0; i < 8; ++i)
supply_register(i + 16, &win.rw_local[i]);
for (i = 0; i < 8; ++i)
supply_register(i + 24, &win.rw_in[i]);
/*
* read the globals & outs saved on the stack (for a trap frame).
*/
sp += 92 + 12; /* XXX - MINFRAME + R_Y */
for (i = 1; i < 14; ++i) {
u_long val;
if (READMEM(sp + i*4, &val) == 0)
supply_register(i, (char *)&val);
}
if (READMEM(pcb.pcb_cpctxp, &cps) == 0)
supply_register(CPS_REGNUM, (char *)&cps);
}
/*
* Set the process context to that of the proc structure at
* system address paddr. Read in the register state.
*/
int
set_procaddr(paddr)
CORE_ADDR paddr;
{
struct proc proc;
struct user *uaddr;
if (paddr == 0)
paddr = (CORE_ADDR)fetch_curproc();
if (paddr < KERNELBASE)
return (1);
if (READMEM(paddr, &proc))
error("cannot read proc struct at 0x%x", paddr);
/*
* This is REALLY STUPID. The only way to tell libkvm that we want to
* change user address maps is with kvm_getu.
* If the getu fails, revert to the old address.
*/
if (kernel_getu((u_long *)&proc) == 0) {
(void)READMEM(curproc, &proc);
(void)kernel_getu((u_long *)&proc);
error("cannot read uarea for proc at 0x%x", paddr);
return (1);
}
curproc = (struct proc *)paddr;
set_kernel_boundaries(curproc);
kvm_fetch_registers(curproc);
return (0);
}
/*
* Get the registers out of a crashdump or /dev/kmem.
* XXX This somehow belongs in kcore.c.
*
* We just get all the registers, so we don't use regno.
*/
/* ARGSUSED */
void
kernel_core_registers(regno)
int regno;
{
/*
* Need to find current u area to get kernel stack and pcb
* where "panic" saved registers.
* (libkvm also needs to know current u area to get user
* address space mapping).
*/
(void)set_procaddr(curproc);
}
/*
* Building in support for stepping through a longjmp is silly.
* Couldn't the gdb maintainers spend their time more productively?
*/
int
get_longjmp_target(pc)
CORE_ADDR *pc;
{
return (0);
}
#endif