[英]How can I see the contents of the DAR (data access register) on PPC using gdb?
I'm doing debugging on an embedded PPC platform (the arch is ppc750) and I noticed that when a binary crashes, if I type 'info registers' into gdb I can't see the contents of the DAR (data access register), which should show the memory address that the program was trying to read - I get only the trap register that tells me the type of the exception: 我正在嵌入式PPC平台(拱门是ppc750)上进行调试,我注意到当二进制文件崩溃时,如果我在gdb中键入“信息寄存器”,则看不到DAR(数据访问寄存器)的内容,它应该显示程序试图读取的内存地址-我仅获得陷阱寄存器,该寄存器告诉我异常的类型:
(gdb) info registers
r0 0x1034875e 271877982
r1 0x7fffed30 2147478832
r2 0xfd7f7a0 265811872
[...]
pc 0xf18d718 0xf18d718
msr 0xd032 53298
cr 0x80000848 2147485768
lr 0xf18d6f8 0xf18d6f8
ctr 0xf235d90 253975952
xer 0x20000000 536870912
orig_r3 0x26 38
trap 0x300 768
Is this even possible? 这有可能吗? I'm using gdb 7.0.1 (kind of old, I know, but more recent versions don't play well with our ancient toolchain).
我使用的是gdb 7.0.1(我知道它有些旧,但是较新的版本在我们的古老工具链中无法很好地发挥作用)。
I can't see the contents of the DAR (data access register)
我看不到DAR(数据访问寄存器)的内容
As far as I can tell, that register is only available/usable in kernel mode. 据我所知,该寄存器仅在内核模式下可用/可用。
Are you debugging on "bare metal"? 您是否正在调试“裸机”? If not, you shouldn't be looking for the
DAR
register in the first place. 如果没有,那么您不应该首先寻找
DAR
寄存器。
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