[committed][gdb/tdep] Handle si_addr_bnd in compat_siginfo_from_siginfo

[Tom de Vries]

On 1/11/21 11:32 AM, Tom de Vries wrote:
> Hi,
> 
> When running test-case gdb.arch/i386-mpx-sigsegv.exp with target board
> unix/-m32, we run into:
> ...
> (gdb) continue^M
> Continuing.^M
> Saw a #BR! status 1 at 0x8048c2d^M
> ^M
> Program received signal SIGSEGV, Segmentation fault^M
> Upper bound violation while accessing address 0x0804c15c^M
> Bounds: [lower = 0x00000000, upper = 0x00000000].^M
> 0x08048a4f in lower (p=0x804c160, a=0x804c180, b=0x804c1a0, c=0x804c1c0, \
>   d=0x804c1e0, len=1) at i386-mpx-sigsegv.c:79^M
> 79        value = *(p - len);^M
> (gdb) FAIL: gdb.arch/i386-mpx-sigsegv.exp: MPX signal segv Lower: 0
> ...
> 
> The problem is that lower and upper in the Bounds message are 0x0, which is
> caused by $_siginfo._sifields._sigfault._addr_bnd.{_lower,_upper} evaluating
> to 0x0.
> 
> Fix this by copying the si_lower/si_upper fields in
> compat_siginfo_from_siginfo.
> 
> Tested on x86_64-linux, with target board unix/-m32.
> 
> Any comments?
> 

Added SEGV_BNDERR define, and committed as below.

Thanks,
- Tom


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