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New handlers for kernel trace and breakpoint traps. These allow 

the kernel debugger (ddb or kgdb) to play with the stack pointer.
This commit is contained in:
gwr 1996-02-16 23:36:52 +00:00
parent 7dff812d6e
commit b3547c4296
2 changed files with 107 additions and 62 deletions
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3
sys/arch/sun3/sun3/genassym.c
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@ -1,4 +1,4 @@
/* $NetBSD: genassym.c,v 1.30 1996/02/02 19:43:09 mycroft Exp $ */
/* $NetBSD: genassym.c,v 1.31 1996/02/16 23:36:52 gwr Exp $ */
/*
* Copyright (c) 1994, 1995 Gordon W. Ross
@ -169,6 +169,7 @@ main()
def("FR_SP", &fp->f_regs[15]);
def("FR_HW", &fp->f_sr);
def("FR_ADJ", &fp->f_stackadj);
def("FR_SIZE", sizeof(struct trapframe));
/* FP frame offsets */
def("FPF_REGS", &fpf->fpf_regs[0]);

166
sys/arch/sun3/sun3/locore.s
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@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.36 1996/02/16 18:06:11 gwr Exp $ */
/* $NetBSD: locore.s,v 1.37 1996/02/16 23:36:54 gwr Exp $ */
/*
* Copyright (c) 1994, 1995 Gordon W. Ross
@ -437,69 +437,16 @@ _trap0:
jra rei | all done
/*
* Our native 4.3 implementation uses trap 1 as sigreturn() and trap 2
* as a breakpoint trap.
* Trap 1 is either:
* sigreturn (native NetBSD executable)
* breakpoint (HPUX executable)
*/
_trap1:
jra sigreturn
_trap2:
jra _trace
/*
* Trap 12 is the entry point for the cachectl "syscall"
* cachectl(command, addr, length)
* command in d0, addr in a1, length in d1
*/
.globl _cachectl
_trap12:
movl d1,sp@- | push length
movl a1,sp@- | push addr
movl d0,sp@- | push command
jbsr _cachectl | do it
lea sp@(12),sp | pop args
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
#if 0 /* COMPAT_HPUX */
/* If process is HPUX, this is a user breakpoint. */
jne trap15
#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:
clrl sp@-
moveml #0xFFFF,sp@-
#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
#endif
moveq #T_TRACE,d0
jra fault
/* fall into sigreturn */
/*
* The sigreturn() syscall comes here. It requires special handling
@ -538,6 +485,103 @@ Lsigr1:
movl sp@,sp | and our SP
jra rei | all done
/*
* Trap 2 is either
* badtrap (native NetBSD executable)
* sigreturn (HPUX executable)
*/
_trap2:
#if 0 /* COMPAT_HPUX */
/* XXX: If HPUX, this is a user breakpoint. */
jne sigreturn
#endif
jra _badtrap
/*
* Trace (single-step) trap. Kernel-mode is special.
* User mode traps are passed simply passed to trap()
*/
_trace:
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 passed 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.
| Save system sp rather than user sp.
lea sp@(FR_SIZE),a6 | Save stack pointer
movl a6,sp@(FR_SP) | from before trap
| If we are not on tmpstk switch to it.
| (allows debugger to frob the stack)
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:
| Now call the trap handler as usual.
clrl sp@- | no VA arg
clrl sp@- | or code arg
movl d0,sp@- | push trap type
jbsr _trap | handle trap
lea sp@(12),sp | pop value args
| 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
/*
* Trap 12 is the entry point for the cachectl "syscall"
* cachectl(command, addr, length)
* command in d0, addr in a1, length in d1
*/
.globl _cachectl
_trap12:
movl d1,sp@- | push length
movl a1,sp@- | push addr
movl d0,sp@- | push command
jbsr _cachectl | do it
lea sp@(12),sp | pop args
jra rei | all done
/*
* Interrupt handlers. Most are auto-vectored,
* and hard-wired the same way on all sun3 models.