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DDB support

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This commit is contained in:
pk 1994-03-23 20:40:26 +00:00
parent 4ccdc884fc
commit 1728074945
2 changed files with 80 additions and 3 deletions
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72
sys/arch/sparc/sparc/locore.s
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@ -42,7 +42,7 @@
* @(#)locore.s 8.2 (Berkeley) 8/12/93
*
* from: Header: locore.s,v 1.51 93/04/21 06:19:37 torek Exp
* $Id: locore.s,v 1.7 1994/03/16 16:14:44 pk Exp $
* $Id: locore.s,v 1.8 1994/03/23 20:40:26 pk Exp $
*/
#define LOCORE
@ -2277,6 +2277,13 @@ dostart:
* want to run (0xf8004000). Until we get everything set,
* we have to be sure to use only pc-relative addressing.
*/
#ifdef DDB
/*
* Additionally, the loader passes `_esym' in %o1. A DDB magic
* number is passed in %o2 to allow for bootloaders that know
* nothing about DDB symbol loading conventions.
*/
#endif
wr %g0, 0, %wim ! make sure we can set psr
mov %o0, %g7 ! save prom vector pointer
@ -2303,6 +2310,19 @@ dostart:
clr %l0 ! lowva
set KERNBASE, %l1 ! highva
set _end + (2 << 18), %l2 ! last va that must be remapped
#ifdef DDB
set 0x44444230, %l3
cmp %o2, %l3 ! chk magic
bne 1f
tst %o1 ! do we have the symbols?
bz 1f
nop
sethi %hi(_esym - KERNBASE), %l3 ! store _esym
st %o1, [%l3 + %lo(_esym - KERNBASE)]
set (2 << 18), %l2 ! compute new va
add %l2, %o1, %l2
1:
#endif
set 1 << 18, %l3 ! segment size in bytes
0:
lduba [%l0] ASI_SEGMAP, %l4 ! segmap[highva] = segmap[lowva];
@ -4303,7 +4323,7 @@ ___builtin_saveregs:
retl
st %i5, [%fp + 0x58] ! fr->fr_argd[5]
#ifdef KGDB
#if defined(KGDB) || defined(DDB)
/*
* Write all windows (user or otherwise), except the current one.
*
@ -4332,7 +4352,55 @@ ENTRY(write_all_windows)
nop
#endif /* KGDB */
#ifdef DDB
ENTRY(setjmp)
std %sp, [%o0+0] ! stack pointer & return pc
st %fp, [%o0+8] ! frame pointer
retl
clr %o0
Lpanic_ljmp:
.asciz "longjmp botch"
ALIGN
ENTRY(longjmp)
addcc %o1, %g0, %g6 ! compute v ? v : 1 in a global register
be,a 0f
mov 1, %g6
0:
mov %o0, %g1 ! save a in another global register
ld [%g1+8], %g7 /* get caller's frame */
1:
cmp %fp, %g7 ! compare against desired frame
bl,a 1b ! if below,
restore ! pop frame and loop
be,a 2f ! if there,
ldd [%g1+0], %o2 ! fetch return %sp and pc, and get out
Llongjmpbotch:
! otherwise, went too far; bomb out
save %sp, -CCFSZ, %sp /* preserve current window */
sethi %hi(Lpanic_ljmp), %o0
call _panic
or %o0, %lo(Lpanic_ljmp), %o0;
unimp 0
2:
cmp %o2, %sp ! %sp must not decrease
bge,a 3f
mov %o2, %sp ! it is OK, put it in place
b,a Llongjmpbotch
3:
jmp %o3 + 8 ! success, return %g6
mov %g6, %o0
#endif /* DDB */
.data
#ifdef DDB
.globl _esym
_esym:
.word 0
#endif
.globl _cold
_cold:
.word 1 ! cold start flag

11
sys/arch/sparc/sparc/trap.c
View File

@ -43,7 +43,7 @@
* @(#)trap.c 8.1 (Berkeley) 6/16/93
*
* from: Header: trap.c,v 1.34 93/05/28 04:34:50 torek Exp
* $Id: trap.c,v 1.9 1994/02/01 06:01:51 deraadt Exp $
* $Id: trap.c,v 1.10 1994/03/23 20:40:28 pk Exp $
*/
#include <sys/param.h>
@ -257,6 +257,15 @@ trap(type, psr, pc, tf)
* handled early here.
*/
if (psr & PSR_PS) {
#ifdef DDB
if (type == T_BREAKPOINT) {
write_all_windows();
if (kdb_trap(type, tf)) {
ADVANCE;
return;
}
}
#endif
/*
* Storing %fsr in cpu_attach will cause this trap
* even though the fpu has been enabled, if and only