Re: [Qemu-devel] [PATCH v3 01/26] tcg-aarch64: Properly detect SIGSEGV writes

2014-04-14 Thread Richard Henderson
On 04/14/2014 04:32 AM, Claudio Fontana wrote: > the problem is not in the two nibbles you show, but in the third nibble: > 31 30 29 28 27 26 25 24 23 22 21 20 > size 1 1 1 v 0 0 opc 0 x > > the third nibble in your mask is 'E' and the expected result is 0, which > forces opc to be

Re: [Qemu-devel] [PATCH v3 01/26] tcg-aarch64: Properly detect SIGSEGV writes

2014-04-14 Thread Claudio Fontana
On 07.04.2014 18:33, Richard Henderson wrote: > On 04/07/2014 12:58 AM, Claudio Fontana wrote: >>> +|| (insn & 0x3bc0) == 0x2840 /* C3.3.7 */ >> >> I think the Load (L) bit should be 0 here so >> >> == 0x2800 > > Oops. Fixed. > >> >>> +|| (insn & 0x3

Re: [Qemu-devel] [PATCH v3 01/26] tcg-aarch64: Properly detect SIGSEGV writes

2014-04-07 Thread Peter Maydell
On 3 April 2014 20:56, Richard Henderson wrote: > Since the kernel doesn't pass any info on the reason for the fault, There are now patches proposed to the kernel to supply this: http://www.spinics.net/lists/arm-kernel/msg320268.html thanks -- PMM

Re: [Qemu-devel] [PATCH v3 01/26] tcg-aarch64: Properly detect SIGSEGV writes

2014-04-07 Thread Richard Henderson
On 04/07/2014 12:58 AM, Claudio Fontana wrote: >> +|| (insn & 0x3bc0) == 0x2840 /* C3.3.7 */ > > I think the Load (L) bit should be 0 here so > > == 0x2800 Oops. Fixed. > >> +|| (insn & 0x3be00c00) == 0x38000400 /* C3.3.8 */ > > With V=1, an op

Re: [Qemu-devel] [PATCH v3 01/26] tcg-aarch64: Properly detect SIGSEGV writes

2014-04-07 Thread Claudio Fontana
On 03.04.2014 21:56, Richard Henderson wrote: > Since the kernel doesn't pass any info on the reason for the fault, > disassemble the instruction to detect a store. > > Signed-off-by: Richard Henderson > --- > user-exec.c | 29 +++-- > 1 file changed, 23 insertions(+), 6