On 2 July 2011 08:50, Jan Kiszka <jan.kis...@web.de> wrote: > From: Jan Kiszka <jan.kis...@siemens.com> > > Recent compilers look deep into cpu_exec, find longjmp as a noreturn > function and decide to smash some stack variables as they won't be used > again. This may lead to env becoming invalid after return from setjmp, > causing crashes. Fix it by reloading env from cpu_single_env in that > case.
Can you give more details of what compiler/platform this was a problem for? My reading of the C standard is that the compiler isn't allowed to trash env across this longjmp, because it's a variable of automatic scope which isn't modified between the setjmp and the longjmp... (We've been looking at this because reloading from cpu_single_env is the wrong fix in the case of user-mode where there are multiple-threads.) Thanks -- PMM
