dmesg-netbsd-x68k-cpu_setmcontext-debug.log

4) ->return
cpu_setmcontext: stack (&sz) = 0x39c2bec restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2b98 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2b98 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2b44 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2b44 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2af0 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2af0 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2a9c restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2a9c restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2a48 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2a48 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c29f4 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c29f4 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c29a0 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c29a0 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c294c restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c294c restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c28f8 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c28f8 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c28a4 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c28a4 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2850 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2850 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c27fc restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c27fc restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c27a8 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c27a8 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2754 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2754 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2700 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2700 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c26ac restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c26ac restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2658 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2658 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2604 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2604 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c25b0 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c25b0 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c255c restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c255c restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2508 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2508 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c24b4 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c24b4 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2460 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2460 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c240c restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c240c restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c23b8 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c23b8 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2364 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2364 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2310 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2310 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c22bc restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c22bc restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2268 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2268 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c2214 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c2214 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c21c0 restore frame (format=11, sz=84) ->return
cpu_setmcontext: stack (&sz) = 0x39c21c0 restore frame (format=11, sz=84) ->reenter_syscall
cpu_setmcontext: stack (&sz) = 0x39c216c restore frame (format=11, sz=84)uvm_fault(0x2d20c0, 0x7fff0000, 0x1) -> 0xe
  type 8, code [mmu,,ssw]: 4015166
trap type 8, code = 0x4015166, v = 0x7fff0000
kernel program counter = 0x7fff0000
kernel: MMU fault trap
pid = 1112, lid = 1, pc = 7FFF0000, ps = 2008, sfc = 1, dfc = 1
Registers:
             0        1        2        3        4        5        6        7
dreg: FFFFFFFF 0000FFFF 000A000D 0022BAC8 00000054 00000000 00000000 0016CB00
areg: FFFFFFFF 039C2178 039C21E0 039C2000 008BB660 00182C6C 039C2170 FFEFF190

Kernel stack (039C1F3C):
9C1F3C: 000035C4 039C2094 00000080 000A000D 0022BAC8 00000054 00000000 00000000
9C1F5C: 0016CB00 039C21E0 039C2000 008BB660 00182C6C 0087E458 039C1F9C 00000001
9C1F7C: 002D20C0 7FFF0000 00000D00 0082F3C0 00000000 002323D8 00000000 00000D00
9C1F9C: 039C1FD0 0000B310 0082F3C0 00000009 00000000 00000D00 00000029 0000000A
9C1FBC: FFFFFFFC 00181A24 00000000 00000D00 002D6B29 039C1FF4 00007668 00000000
9C1FDC: 00000D00 00000029 00000029 00000005 00000000 00000D00 039C2078 00183084
9C1FFC: 00000029 
panic: MMU fault
cpu0: Begin traceback...
?(?)
db_panic(2000,8,10,182c6c,39c1f3c) at 0
cpu0: End traceback...

dumping to dev 4,1 offset 239549
dump 

sig_machdep.c.diff

Index: sys/arch/m68k/m68k/sig_machdep.c
===================================================================
RCS file: /cvsroot/src/sys/arch/m68k/m68k/sig_machdep.c,v
retrieving revision 1.50
diff -u -p -d -r1.50 sig_machdep.c
--- sys/arch/m68k/m68k/sig_machdep.c	27 Nov 2018 14:09:54 -0000	1.50
+++ sys/arch/m68k/m68k/sig_machdep.c	11 Feb 2021 16:34:31 -0000
@@ -287,6 +289,8 @@ cpu_setmcontext(struct lwp *l, const mco
 	unsigned int format = mcp->__mc_pad.__mc_frame.__mcf_format;
 	int sz, error;
 
+printf("%s: stack (&sz) = %p", __func__, &sz);
+
 	/* Validate the supplied context */
 	if ((flags & _UC_CPU) != 0) {
 		error = cpu_mcontext_validate(l, mcp);
@@ -301,8 +305,10 @@ cpu_setmcontext(struct lwp *l, const mco
 		sz = exframesize[format];
 		if (sz < 0)
 			return (EINVAL);
+printf(" restore frame (format=%d, sz=%d)", format, sz);
 
 		if (frame->f_stackadj == 0) {
+printf(" ->reenter_syscall\n");
 			reenter_syscall(frame, sz);
 			/* NOTREACHED */
 		}
@@ -411,5 +417,6 @@ cpu_setmcontext(struct lwp *l, const mco
 		l->l_sigstk.ss_flags &= ~SS_ONSTACK;
 	mutex_exit(l->l_proc->p_lock);
 
+printf(" ->return\n");
 	return 0;
 }