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sun4v: note what causes the kernel to crash

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This commit is contained in:
palle 2018-12-17 20:13:46 +00:00
parent 07ed41e72f
commit 3ec52984d2
1 changed files with 8 additions and 2 deletions
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10
sys/arch/sparc64/doc/TODO
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@ -1,4 +1,4 @@
/* $NetBSD: TODO,v 1.27 2018/10/05 19:53:47 palle Exp $ */
/* $NetBSD: TODO,v 1.28 2018/12/17 20:13:46 palle Exp $ */
Things to be done:
@ -12,7 +12,13 @@ sun4u:
sun4v:
- current status: The kernel boots and starts the init process (pid 1)
which spawns /sbin/sh (pid 2). This is forked as a new /sbin/sh (pid 3) which crashes, probably due to MMU DPROT issues.
which spawns /sbin/sh (pid 2). This is forked as a new /sbin/sh (pid 3)
which crashes, probably due to MMU DPROT issues.
Looks like the user process tries to write to the stack as part of a save
instruction since cansave is zero. This causes a DMMU PROT trap (0x6c) which
calls sun4v_tl0_dtsb_prot which calls sun4v_datatrap which calls TRAP_SETUP().
This macro has code that does a save instruction, again to the user stack,
which again causes a MMU DPROT trap...
- 64-bit kernel support
- 32-bit kernel support
- libkvm