Print whole machine state on double fault.
It is quite useful when double fault is not caused by a stack overflow. Tested by: pho (as part of the larger patch) Sponsored by: The FreeBSD Foundation MFC after: 1 week
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=322496
@ -822,10 +822,24 @@ dblfault_handler(struct trapframe *frame)
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if (dtrace_doubletrap_func != NULL)
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(*dtrace_doubletrap_func)();
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#endif
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printf("\nFatal double fault\n");
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printf("rip = 0x%lx\n", frame->tf_rip);
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printf("rsp = 0x%lx\n", frame->tf_rsp);
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printf("rbp = 0x%lx\n", frame->tf_rbp);
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printf("\nFatal double fault\n"
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"rip %#lx rsp %#lx rbp %#lx\n"
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"rax %#lx rdx %#lx rbx %#lx\n"
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"rcx %#lx rsi %#lx rdi %#lx\n"
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"r8 %#lx r9 %#lx r10 %#lx\n"
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"r11 %#lx r12 %#lx r13 %#lx\n"
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"r14 %#lx r15 %#lx rflags %#lx\n"
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"cs %#lx ss %#lx ds %#hx es %#hx fs %#hx gs %#hx\n"
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"fsbase %#lx gsbase %#lx kgsbase %#lx\n",
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frame->tf_rip, frame->tf_rsp, frame->tf_rbp,
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frame->tf_rax, frame->tf_rdx, frame->tf_rbx,
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frame->tf_rcx, frame->tf_rdi, frame->tf_rsi,
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frame->tf_r8, frame->tf_r9, frame->tf_r10,
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frame->tf_r11, frame->tf_r12, frame->tf_r13,
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frame->tf_r14, frame->tf_r15, frame->tf_rflags,
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frame->tf_cs, frame->tf_ss, frame->tf_ds, frame->tf_es,
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frame->tf_fs, frame->tf_gs,
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rdmsr(MSR_FSBASE), rdmsr(MSR_GSBASE), rdmsr(MSR_KGSBASE));
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#ifdef SMP
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/* two separate prints in case of a trap on an unmapped page */
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printf("cpuid = %d; ", PCPU_GET(cpuid));
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