diff options
Diffstat (limited to 'results/scraper/launchpad-without-comments/757702')
| -rw-r--r-- | results/scraper/launchpad-without-comments/757702 | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/757702 b/results/scraper/launchpad-without-comments/757702 new file mode 100644 index 000000000..b0bc130c2 --- /dev/null +++ b/results/scraper/launchpad-without-comments/757702 @@ -0,0 +1,3 @@ +ARM: singlestepping insn which UNDEFs should stop at UNDEF vector insn, not after it + +ARMv7a has lot of undefined instruction from its instruction opcode space. This undefined instructions are very useful for replacing sensitive non-priviledged instructions of guest operating systems (virtualization). The undefined instruction exception executes at <exception_base> + 0x4, where <exception_base> can be 0x0 or 0xfff00000. Currently, in qemu 0.14.0 undefined instruction fault at 0x8 offset instead of 0x4. This was not a problem with qemu 0.13.0, seems like this is a new bug. As as example, if we try to execute value "0xec019800" in qemu 0.14.0 then it should cause undefined exception at <exception_base>+0x4 since "0xec019800" is an undefined instruction. \ No newline at end of file |