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Print whole machine state on double fault.

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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
This commit is contained in:
Konstantin Belousov 2017-08-14 11:23:07 +00:00
parent 0fd7ea1f21
commit baec5778ed
1 changed files with 18 additions and 4 deletions
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22
sys/amd64/amd64/trap.c
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@ -822,10 +822,24 @@ dblfault_handler(struct trapframe *frame)
if (dtrace_doubletrap_func != NULL)
(*dtrace_doubletrap_func)();
#endif
printf("\nFatal double fault\n");
printf("rip = 0x%lx\n", frame->tf_rip);
printf("rsp = 0x%lx\n", frame->tf_rsp);
printf("rbp = 0x%lx\n", frame->tf_rbp);
printf("\nFatal double fault\n"
"rip %#lx rsp %#lx rbp %#lx\n"
"rax %#lx rdx %#lx rbx %#lx\n"
"rcx %#lx rsi %#lx rdi %#lx\n"
"r8 %#lx r9 %#lx r10 %#lx\n"
"r11 %#lx r12 %#lx r13 %#lx\n"
"r14 %#lx r15 %#lx rflags %#lx\n"
"cs %#lx ss %#lx ds %#hx es %#hx fs %#hx gs %#hx\n"
"fsbase %#lx gsbase %#lx kgsbase %#lx\n",
frame->tf_rip, frame->tf_rsp, frame->tf_rbp,
frame->tf_rax, frame->tf_rdx, frame->tf_rbx,
frame->tf_rcx, frame->tf_rdi, frame->tf_rsi,
frame->tf_r8, frame->tf_r9, frame->tf_r10,
frame->tf_r11, frame->tf_r12, frame->tf_r13,
frame->tf_r14, frame->tf_r15, frame->tf_rflags,
frame->tf_cs, frame->tf_ss, frame->tf_ds, frame->tf_es,
frame->tf_fs, frame->tf_gs,
rdmsr(MSR_FSBASE), rdmsr(MSR_GSBASE), rdmsr(MSR_KGSBASE));
#ifdef SMP
/* two separate prints in case of a trap on an unmapped page */
printf("cpuid = %d; ", PCPU_GET(cpuid));