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| author | Luca Dariz <luca@orpolo.org> | 2023-07-29 19:45:14 +0200 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2023-08-04 23:34:18 +0200 |
| commit | 8b29b18fda413928c32473475ca51aa05c52db18 (patch) | |
| tree | e3dca31b5321ae00d7c88b5dc6a78161622fcbeb /x86_64/locore.S | |
| parent | bdcafee412ab6eec58f6b315e16e57fe3dad002f (diff) | |
| download | gnumach-8b29b18fda413928c32473475ca51aa05c52db18.tar.gz gnumach-8b29b18fda413928c32473475ca51aa05c52db18.tar.bz2 gnumach-8b29b18fda413928c32473475ca51aa05c52db18.zip | |
x86_64: install emergency handler for double fault
* i386/i386/idt.c: add selector for the interrupt-specific stack
* i386/i386/ktss.c: configure ist1 to use a dedicated stack
* i386/i386/trap.c: add double fault handler, which just prints the
state and panics. There is not much else to do in this case but it's
useful for troubleshooting
* x86_64/idt_inittab.S: allow to specify an interrupt stack for custom
handlers
* x86_64/locore.S: add double fault handler
Message-Id: <20230729174514.1145656-1-luca@orpolo.org>
Diffstat (limited to 'x86_64/locore.S')
| -rw-r--r-- | x86_64/locore.S | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/x86_64/locore.S b/x86_64/locore.S index 2938e430..16b0dde5 100644 --- a/x86_64/locore.S +++ b/x86_64/locore.S @@ -345,6 +345,21 @@ ENTRY(start_timer) * */ +/* Try to save/show some information when a double fault happens + * We can't recover to a working state, so if we have a debugger wait for it, + * otherwise reset */ +ENTRY(t_dbl_fault) + INT_FIX + cli /* disable interrupts that might corrupt the state*/ + pusha + movq %cr2,%rax + movq %rax,R_CR2-R_R15(%rsp) /* CR2 might contain the faulting address */ + subq $48,%rsp // FIXME remove when segments are cleaned up + movq %rsp,%rdi /* pass the saved state */ + call handle_double_fault + jmp cpu_shutdown /* reset */ +END(t_dbl_fault) + /* * General protection or segment-not-present fault. * Check for a GP/NP fault in the kernel_return |