Prints the stack trace and registers.
Signed-off-by: Peter Feiner <pfeiner@xxxxxxxxxx>
---
lib/x86/desc.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 63 insertions(+), 6 deletions(-)
diff --git a/lib/x86/desc.c b/lib/x86/desc.c
index 16cbba5..75765ef 100644
--- a/lib/x86/desc.c
+++ b/lib/x86/desc.c
@@ -38,6 +38,67 @@ struct ex_record {
extern struct ex_record exception_table_start, exception_table_end;
+static const char* exception_mnemonic(int vector)
+{
+ switch(vector) {
+ case 0: return "#DE";
+ case 1: return "#DB";
+ case 2: return "#NMI";
+ case 3: return "#BP";
+ case 4: return "#OF";
+ case 5: return "#BR";
+ case 6: return "#UD";
+ case 7: return "#NM";
+ case 8: return "#DF";
+ case 10: return "#TS";
+ case 11: return "#NP";
+ case 12: return "#SS";
+ case 13: return "#GP";
+ case 14: return "#PF";
+ case 16: return "#MF";
+ case 17: return "#AC";
+ case 18: return "#MC";
+ case 19: return "#XM";
+ default: return "#??";
+ }
+}
+
+static void unhandled_exception(struct ex_regs *regs, bool cpu)
+{
+ printf("Unhandled %sexception %ld %s at ip %016lx\n",
+ cpu ? "cpu " : "", regs->vector,
+ exception_mnemonic(regs->vector), regs->rip);
+ if (regs->vector == 14)
+ printf("PF at 0x%lx addr 0x%lx\n", regs->rip, read_cr2());
+
+ printf("error_code=%04lx rflags=%08lx cs=%08lx\n"
+ "rax=%016lx rcx=%016lx rdx=%016lx rbx=%016lx\n"
+ "rbp=%016lx rsi=%016lx rdi=%016lx\n"
+#ifdef __x86_64__
+ " r8=%016lx r9=%016lx r10=%016lx r11=%016lx\n"
+ "r12=%016lx r13=%016lx r14=%016lx r15=%016lx\n"
+#endif
+ "cr0=%016lx cr2=%016lx cr3=%016lx cr4=%016lx\n"
+#ifdef __x86_64__
+ "cr8=%016lx\n"
+#endif
+ ,
+ regs->error_code, regs->rflags, regs->cs,
+ regs->rax, regs->rcx, regs->rdx, regs->rbx,
+ regs->rbp, regs->rsi, regs->rdi,
+#ifdef __x86_64__
+ regs->r8, regs->r9, regs->r10, regs->r11,
+ regs->r12, regs->r13, regs->r14, regs->r15,
+#endif
+ read_cr0(), read_cr2(), read_cr3(), read_cr4()
+#ifdef __x86_64__
+ , read_cr8()
+#endif
+ );
+ dump_frame_stack((void*) regs->rip, (void*) regs->rbp);
+ exit(7);
+}
+
static void check_exception_table(struct ex_regs *regs)
{
struct ex_record *ex;
@@ -53,8 +114,7 @@ static void check_exception_table(struct ex_regs *regs)
return;
}
}
- printf("unhandled exception %lu\n", regs->vector);
- abort();
+ unhandled_exception(regs, false);
}
static void (*exception_handlers[32])(struct ex_regs *regs);
@@ -75,10 +135,7 @@ void do_handle_exception(struct ex_regs *regs)
exception_handlers[regs->vector](regs);
return;
}
- printf("unhandled cpu exception %lu\n", regs->vector);
- if (regs->vector == 14)
- printf("PF at 0x%lx addr 0x%lx\n", regs->rip, read_cr2());
- abort();
+ unhandled_exception(regs, true);
}
#define EX(NAME, N) extern char NAME##_fault; \
--
2.7.0.rc3.207.g0ac5344
--
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