Handle kernel trace traps and breakpoints like the Sun3 port:
- Only pass user trace traps and breakpoints on to trap(). - Before entering the debugger, switch to a temporary stack so that the debugger can alter the stack pointer. - Add glue for KGDB (still not complete). Clearly mark the MMU enable trampoline code.
This commit is contained in:
thorpej
parent
0ff075f6e7
commit
8499e0131e
|
|
@ -1,6 +1,7 @@
|
|||
/* $NetBSD: locore.s,v 1.56 1996/10/05 07:06:11 thorpej Exp $ */
|
||||
/* $NetBSD: locore.s,v 1.57 1996/10/05 07:16:52 thorpej Exp $ */
|
||||
|
||||
/*
|
||||
* Copyright (c) 1994, 1995 Gordon W. Ross
|
||||
* Copyright (c) 1988 University of Utah.
|
||||
* Copyright (c) 1980, 1990, 1993
|
||||
* The Regents of the University of California. All rights reserved.
|
||||
|
|
@ -476,45 +477,100 @@ _trap12:
|
|||
jra rei | all done
|
||||
|
||||
/*
|
||||
* Trap 15 is used for:
|
||||
* - KGDB traps
|
||||
* - trace traps for SUN binaries (not fully supported yet)
|
||||
* We just pass it on and let trap() sort it all out
|
||||
*/
|
||||
_trap15:
|
||||
clrl sp@-
|
||||
moveml #0xFFFF,sp@-
|
||||
#ifdef KGDB
|
||||
moveq #T_TRAP15,d0
|
||||
movw sp@(FR_HW),d1 | get PSW
|
||||
andw #PSL_S,d1 | from user mode?
|
||||
jeq fault | yes, just a regular fault
|
||||
movl d0,sp@-
|
||||
.globl _kgdb_trap_glue
|
||||
jbsr _kgdb_trap_glue | returns if no debugger
|
||||
addl #4,sp
|
||||
#endif
|
||||
moveq #T_TRAP15,d0
|
||||
jra fault
|
||||
|
||||
/*
|
||||
* Hit a breakpoint (trap 1 or 2) instruction.
|
||||
* Push the code and treat as a normal fault.
|
||||
* Trace (single-step) trap. Kernel-mode is special.
|
||||
* User mode traps are simply passed on to trap().
|
||||
*/
|
||||
_trace:
|
||||
clrl sp@-
|
||||
clrl sp@- | stack adjust count
|
||||
moveml #0xFFFF,sp@-
|
||||
moveq #T_TRACE,d0
|
||||
movw sp@(FR_HW),d1 | get PSW
|
||||
andw #PSL_S,d1 | from system mode?
|
||||
jne kbrkpt | yes, kernel breakpoint
|
||||
jra fault | no, user-mode fault
|
||||
|
||||
/*
|
||||
* Trap 15 is used for:
|
||||
* - GDB breakpoints (in user programs)
|
||||
* - KGDB breakpoints (in the kernel)
|
||||
* - trace traps for SUN binaries (not fully supported yet)
|
||||
* User mode traps are simply passed to trap().
|
||||
*/
|
||||
_trap15:
|
||||
clrl sp@- | stack adjust count
|
||||
moveml #0xFFFF,sp@-
|
||||
moveq #T_TRAP15,d0
|
||||
movw sp@(FR_HW),d1 | get PSW
|
||||
andw #PSL_S,d1 | from system mode?
|
||||
jne kbrkpt | yes, kernel breakpoint
|
||||
jra fault | no, user-mode fault
|
||||
|
||||
kbrkpt: | Kernel-mode breakpoint or trace trap. (d0=trap_type)
|
||||
| Save the system sp rather than the user sp.
|
||||
movw #PSL_HIGHIPL,sr | lock out interrupts
|
||||
lea sp@(FR_SIZE),a6 | Save stack pointer
|
||||
movl a6,sp@(FR_SP) | from before trap
|
||||
|
||||
| If were are not on tmpstk switch to it.
|
||||
| (so debugger can change the stack pointer)
|
||||
movl a6,d1
|
||||
cmpl #tmpstk,d1
|
||||
jls Lbrkpt2 | already on tmpstk
|
||||
| Copy frame to the temporary stack
|
||||
movl sp,a0 | a0=src
|
||||
lea tmpstk-96,a1 | a1=dst
|
||||
movl a1,sp | sp=new frame
|
||||
moveq #FR_SIZE,d1
|
||||
Lbrkpt1:
|
||||
movl a0@+,a1@+
|
||||
subql #4,d1
|
||||
bgt Lbrkpt1
|
||||
|
||||
Lbrkpt2:
|
||||
| Call the trap handler for the kernel debugger.
|
||||
| Do not call trap() to do it, so that we can
|
||||
| set breakpoints in trap() if we want. We know
|
||||
| the trap type is either T_TRACE or T_BREAKPOINT.
|
||||
| If we have both DDB and KGDB, let KGDB see it first,
|
||||
| because KGDB will just return 0 if not connected.
|
||||
| Save args in d2, a2
|
||||
movl d0,d2 | trap type
|
||||
movl sp,a2 | frame ptr
|
||||
#ifdef KGDB
|
||||
moveq #T_TRACE,d0
|
||||
movw sp@(FR_HW),d1 | get SSW
|
||||
andw #PSL_S,d1 | from user mode?
|
||||
jeq fault | no, regular fault
|
||||
movl d0,sp@-
|
||||
jbsr _kgdb_trap_glue | returns if no debugger
|
||||
addl #4,sp
|
||||
| Let KGDB handle it (if connected)
|
||||
movl a2,sp@- | push frame ptr
|
||||
movl d2,sp@- | push trap type
|
||||
jbsr _kgdb_trap | handle the trap
|
||||
addql #8,sp | pop args
|
||||
cmpl #0,d0 | did kgdb handle it?
|
||||
jne Lbrkpt3 | yes, done
|
||||
#endif
|
||||
moveq #T_TRACE,d0
|
||||
jra fault
|
||||
#ifdef DDB
|
||||
| Let DDB handle it
|
||||
movl a2,sp@- | push frame ptr
|
||||
movl d2,sp@- | push trap type
|
||||
jbsr _kdb_trap | handle the trap
|
||||
addql #8,sp | pop args
|
||||
#if 0 /* not needed on hp300 */
|
||||
cmpl #0,d0 | did ddb handle it?
|
||||
jne Lbrkpt3 | yes, done
|
||||
#endif
|
||||
#endif
|
||||
/* Sun 3 drops into PROM here. */
|
||||
Lbrkpt3:
|
||||
| The stack pointer may have been modified, or
|
||||
| data below it modified (by kgdb push call),
|
||||
| so push the hardware frame at the current sp
|
||||
| before restoring registers and returning.
|
||||
|
||||
movl sp@(FR_SP),a0 | modified sp
|
||||
lea sp@(FR_SIZE),a1 | end of our frame
|
||||
movl a1@-,a0@- | copy 2 longs with
|
||||
movl a1@-,a0@- | ... predecrement
|
||||
movl a0,sp@(FR_SP) | sp = h/w frame
|
||||
moveml sp@+,#0x7FFF | restore all but sp
|
||||
movl sp@,sp | ... and sp
|
||||
rte | all done
|
||||
|
||||
/* Use common m68k sigreturn */
|
||||
#include <m68k/m68k/sigreturn.s>
|
||||
|
|
@ -916,6 +972,12 @@ Lcodecopy:
|
|||
jcs Lcodecopy | no, keep going
|
||||
jmp MAXADDR | go for it!
|
||||
|
||||
/*
|
||||
* BEGIN MMU TRAMPOLINE. This section of code is not
|
||||
* executed in-place. It's copied to the last page
|
||||
* of RAM (mapped va == pa) and executed there.
|
||||
*/
|
||||
|
||||
Lhighcode:
|
||||
RELOC(_mmutype, a0)
|
||||
tstl a0@ | HP MMU?
|
||||
|
|
@ -949,6 +1011,10 @@ Lhpmmu3:
|
|||
jmp Lenab1 | jmp to mapped code
|
||||
Lehighcode:
|
||||
|
||||
/*
|
||||
* END MMU TRAMPOLINE.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Should be running mapped from this point on
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in New Issue