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[unix-history] / usr / src / old / dbx / coredump.c
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#ifndef lint
static char sccsid[] = "@(#)coredump.c 5.1 (Berkeley) %G%";
#endif not lint
static char rcsid[] = "$Header: coredump.c,v 1.5 84/12/26 10:38:56 linton Exp $";
/*
* Deal with the core dump anachronism.
*/
#include "defs.h"
#include "coredump.h"
#include "machine.h"
#include "object.h"
#include "main.h"
#include <sys/param.h>
#include <sys/dir.h>
#include <machine/psl.h>
#include <machine/pte.h>
#include <sys/user.h>
#include <sys/vm.h>
#include <machine/reg.h>
#include <a.out.h>
#ifndef public
#define coredump_readin(m, r, s) coredump_xreadin(&(m), r, &(s))
#include "machine.h"
#endif
#define MAXSTKADDR (0x80000000 - ctob(UPAGES)) /* highest stack address */
typedef struct {
Address begin;
Address end;
Address seekaddr;
} Map;
private Map datamap, stkmap;
private File objfile;
private struct exec hdr;
/*
* Special variables for debugging the kernel.
*/
private integer masterpcbb;
private integer slr;
private struct pte *sbr;
private struct pcb pcb;
private getpcb ()
{
fseek(corefile, masterpcbb & ~0x80000000, 0);
get(corefile, pcb);
pcb.pcb_p0lr &= ~AST_CLR;
printf("p0br %lx p0lr %lx p1br %lx p1lr %lx\n",
pcb.pcb_p0br, pcb.pcb_p0lr, pcb.pcb_p1br, pcb.pcb_p1lr
);
setreg(0, pcb.pcb_r0);
setreg(1, pcb.pcb_r1);
setreg(2, pcb.pcb_r2);
setreg(3, pcb.pcb_r3);
setreg(4, pcb.pcb_r4);
setreg(5, pcb.pcb_r5);
setreg(6, pcb.pcb_r6);
setreg(7, pcb.pcb_r7);
setreg(8, pcb.pcb_r8);
setreg(9, pcb.pcb_r9);
setreg(10, pcb.pcb_r10);
setreg(11, pcb.pcb_r11);
setreg(ARGP, pcb.pcb_ap);
setreg(FRP, pcb.pcb_fp);
setreg(STKP, pcb.pcb_ksp);
setreg(PROGCTR, pcb.pcb_pc);
}
public coredump_getkerinfo ()
{
Symbol s;
s = lookup(identname("Sysmap", true));
if (s == nil) {
panic("can't find 'Sysmap'");
}
sbr = (struct pte *) (s->symvalue.offset);
s = lookup(identname("Syssize", true));
if (s == nil) {
panic("can't find 'Syssize'");
}
slr = (integer) (s->symvalue.offset);
printf("sbr %lx slr %lx\n", sbr, slr);
s = lookup(identname("masterpaddr", true));
if (s == nil) {
panic("can't find 'masterpaddr'");
}
fseek(
corefile,
datamap.seekaddr + s->symvalue.offset&0x7fffffff - datamap.begin,
0
);
get(corefile, masterpcbb);
masterpcbb = (masterpcbb&PG_PFNUM)*512;
getpcb();
}
private copyregs (savreg, reg)
Word savreg[], reg[];
{
reg[0] = savreg[R0];
reg[1] = savreg[R1];
reg[2] = savreg[R2];
reg[3] = savreg[R3];
reg[4] = savreg[R4];
reg[5] = savreg[R5];
reg[6] = savreg[R6];
reg[7] = savreg[R7];
reg[8] = savreg[R8];
reg[9] = savreg[R9];
reg[10] = savreg[R10];
reg[11] = savreg[R11];
reg[ARGP] = savreg[AP];
reg[FRP] = savreg[FP];
reg[STKP] = savreg[SP];
reg[PROGCTR] = savreg[PC];
}
/*
* Read the user area information from the core dump.
*/
public coredump_xreadin(mask, reg, signo)
int *mask;
Word reg[];
int *signo;
{
register struct user *up;
register Word *savreg;
union {
struct user u;
char dummy[ctob(UPAGES)];
} ustruct;
Symbol s;
objfile = fopen(objname, "r");
if (objfile == nil) {
fatal("can't read \"%s\"", objname);
}
get(objfile, hdr);
if (vaddrs) {
datamap.begin = 0;
datamap.end = 0xffffffff;
stkmap.begin = 0xffffffff;
stkmap.end = 0xffffffff;
} else {
up = &(ustruct.u);
fread(up, ctob(UPAGES), 1, corefile);
savreg = (Word *) &(ustruct.dummy[ctob(UPAGES)]);
*mask = savreg[PS];
copyregs(savreg, reg);
*signo = up->u_arg[0];
datamap.seekaddr = ctob(UPAGES);
stkmap.begin = MAXSTKADDR - ctob(up->u_ssize);
stkmap.end = MAXSTKADDR;
stkmap.seekaddr = datamap.seekaddr + ctob(up->u_dsize);
switch (hdr.a_magic) {
case OMAGIC:
datamap.begin = 0;
datamap.end = ctob(up->u_tsize) + ctob(up->u_dsize);
break;
case NMAGIC:
case ZMAGIC:
datamap.begin = (Address) ptob(btop(ctob(up->u_tsize) - 1) + 1);
datamap.end = datamap.begin + ctob(up->u_dsize);
break;
default:
fatal("bad magic number 0x%x", hdr.a_magic);
}
#ifdef UXMAG
/*
* Core dump not from this object file?
*/
if (hdr.a_magic != 0 and up->u_exdata.ux_mag != 0 and
hdr.a_magic != up->u_exdata.ux_mag) {
warning("core dump ignored");
coredump = false;
fclose(corefile);
fclose(objfile);
start(nil, nil, nil);
}
#endif
}
}
public coredump_close()
{
fclose(objfile);
}
public coredump_readtext(buff, addr, nbytes)
char *buff;
Address addr;
int nbytes;
{
if (hdr.a_magic == OMAGIC or vaddrs) {
coredump_readdata(buff, addr, nbytes);
} else {
fseek(objfile, N_TXTOFF(hdr) + addr, 0);
fread(buff, nbytes, sizeof(Byte), objfile);
}
}
/*
* Map a virtual address to a physical address.
*/
private Address vmap (addr)
Address addr;
{
Address r;
integer v, n;
struct pte pte;
r = addr & ~0xc0000000;
v = btop(r);
switch (addr&0xc0000000) {
case 0xc0000000:
case 0x80000000:
/*
* In system space, so get system pte.
* If it is valid or reclaimable then the physical address
* is the combination of its page number and the page offset
* of the original address.
*/
if (v >= slr) {
error("address %x out of segment", addr);
}
r = ((long) (sbr + v)) & ~0x80000000;
goto simple;
case 0x40000000:
/*
* In p1 space, must not be in shadow region.
*/
if (v < pcb.pcb_p1lr) {
error("address %x out of segment", addr);
}
r = (Address) (pcb.pcb_p1br + v);
break;
case 0x00000000:
/*
* In p0 space, must not be off end of region.
*/
if (v >= pcb.pcb_p0lr) {
error("address %x out of segment", addr);
}
r = (Address) (pcb.pcb_p0br + v);
break;
default:
/* do nothing */
break;
}
/*
* For p0/p1 address, user-level page table should be in
* kernel virtual memory. Do second-level indirect by recursing.
*/
if ((r & 0x80000000) == 0) {
error("bad p0br or p1br in pcb");
}
r = vmap(r);
simple:
/*
* "r" is now the address of the pte of the page
* we are interested in; get the pte and paste up the physical address.
*/
fseek(corefile, r, 0);
n = fread(&pte, sizeof(pte), 1, corefile);
if (n != 1) {
error("page table botch (fread at %x returns %d)", r, n);
}
if (pte.pg_v == 0 and (pte.pg_fod != 0 or pte.pg_pfnum == 0)) {
error("page no valid or reclamable");
}
return (addr&PGOFSET) + ((Address) ptob(pte.pg_pfnum));
}
public coredump_readdata(buff, addr, nbytes)
char *buff;
Address addr;
int nbytes;
{
Address a;
a = addr;
if (a < datamap.begin) {
if (hdr.a_magic == OMAGIC) {
error("[data address 0x%x too low (lb = 0x%x)]", a, datamap.begin);
} else {
coredump_readtext(buff, a, nbytes);
}
} else if (a > stkmap.end) {
error("data address 0x%x too high (ub = 0x%x)", a, stkmap.end);
} else {
if (vaddrs) {
vreadfromfile(corefile, a, buff, nbytes);
} else {
readfromfile(corefile, a, buff, nbytes);
}
}
}
/*
* Read a block of data from a memory image, mapping virtual addresses.
* Have to watch out for page boundaries.
*/
private vreadfromfile (corefile, v, buff, nbytes)
File corefile;
Address v;
char *buff;
integer nbytes;
{
Address a;
integer i, remainder, pagesize;
char *bufp;
a = v;
pagesize = (integer) ptob(1);
remainder = pagesize - (a mod pagesize);
if (remainder >= nbytes) {
readfromfile(corefile, vmap(a), buff, nbytes);
} else {
readfromfile(corefile, vmap(a), buff, remainder);
a += remainder;
i = nbytes - remainder;
bufp = buff + remainder;
while (i > pagesize) {
readfromfile(corefile, vmap(a), bufp, pagesize);
a += pagesize;
bufp += pagesize;
i -= pagesize;
}
readfromfile(corefile, vmap(a), bufp, i);
}
}
private readfromfile (f, a, buff, nbytes)
File f;
Address a;
char *buff;
integer nbytes;
{
integer fileaddr;
if (a < stkmap.begin) {
fileaddr = datamap.seekaddr + a - datamap.begin;
} else {
fileaddr = stkmap.seekaddr + a - stkmap.begin;
}
fseek(f, fileaddr, 0);
fread(buff, nbytes, sizeof(Byte), f);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.