在 2013-7-23，上午5:54，Eric Botcazou <ebotca...@adacore.com> 写道：
>> Recently i am working on the atomic support for RTEMS. Our basic idea is to >> integrate the C11 atomic API into RTEMS. we have integrated the >> stdatomic.h into newlib which is used by RTEMS. And when we test the >> atomic ops on LEON3 platform (an important platform for RTEMS to test and >> verify SMP support) it posted that there is no defined functions like >> "__atomic_fetch_add_xx". And this is because of SPARC V7-V8 lacks of >> compare and swap instruction., GCC also does not support those build in >> ops. But for LEON3 it is a special case, it has its own casa instruction >> to support compare_and_swap function. So i wonder whether gcc can consider >> support LEON3 build in atomic ops. > > Sure, patches to that effect are welcome. This will need to be coordinated > with binutils because the assembler will very likely reject the instructions > if it is passed -Av8 as is currently done for LEON/LEON3. As a matter of > fact, > I just installed a patch to add basic LEON3 support on the trunk so almost > everything is already there as far as the compiler is concerned. > Hi Eric, do you mean that you already have a patch to solve this issue which is just not merged to mainline? If yes could you send me your patch and tell me to how enable this feature? Thank you! > -- > Eric Botcazou
