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Lay groundwork for KGDB by pulling in the trap 15 handler from hp300.

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scottr 1998-04-20 05:46:04 +00:00
parent e86e483504
commit a2973edb42
1 changed files with 65 additions and 7 deletions
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72
sys/arch/mac68k/mac68k/locore.s
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@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.95 1998/04/20 05:41:21 scottr Exp $ */
/* $NetBSD: locore.s,v 1.96 1998/04/20 05:46:04 scottr Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -706,14 +706,72 @@ ENTRY_NOPROFILE(trap15)
jne Lkbrkpt | yes, kernel breakpoint
jra _ASM_LABEL(fault) | no, user-mode fault
Lkbrkpt:
Lkbrkpt: | 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 #_ASM_LABEL(tmpstk),d1
jls Lbrkpt2 | already on tmpstk
| Copy frame to the temporary stack
movl sp,a0 | a0=src
lea _ASM_LABEL(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
movl d0,sp@-
jbsr _C_LABEL(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 _C_LABEL(kgdb_trap) | handle the trap
addql #8,sp | pop args
cmpl #0,d0 | did kgdb handle it?
jne Lbrkpt3 | yes, done
#endif
moveq #T_TRAP15,d0
jra _ASM_LABEL(fault) | no, user-mode fault
#ifdef DDB
| Let DDB handle it
movl a2,sp@- | push frame ptr
movl d2,sp@- | push trap type
jbsr _C_LABEL(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>