On Fri, Dec 11, 2009 at 4:36 PM, Laurent Desnogues <laurent.desnog...@gmail.com> wrote: > On Fri, Dec 11, 2009 at 4:18 AM, Jun Koi <junkoi2...@gmail.com> wrote: >> >> Another question: I look at tcg_gen_callN() to see how the helper is >> executed. We put the helper opcode into the TCG code buffer, and put >> helper's params into gen_opparam_buf. >> >> However, then when TCG generates code to actually call the helper, we >> just put the opcode of the host insn into the output buffer, which is >> target code at this step, then run it. >> >> Now when the helper is executed, it must get its param from the stack, >> which is really the host stack. But as said above, its params are in >> gen_opparam_buf, but not in stack? >> I searched around, and dont see anywhere we link gen_opparam_buf with >> the host stack. So how the helper can get its param?? >> >> Surely I missed something, or misunderstand the whole picture. Any hint? > > Take a look at tcg.c:tcg_reg_alloc_call >
Now I see how TCG manipulates the stack memory there. Thanks, J
