зеркало из https://github.com/mozilla/gecko-dev.git
0beeba79e1
In the 32-bit parisc runtime, the first four non floating-point arguments are passed in registers (%r26, %r25, %r24 and %r23). The remaining arguments are passed on the stack. There are four reserved slots on the stack that the callee can use to save the first four argument registers if the callee desires. The StubN functions are special in that arguments are not explicitly declared. %r26 is used for the "self" pointer. The call to SharedStub(n) loads n into %r26 and clobbers the "self" pointer in %r26. The hppa SharedStub implementation expects to find the "self" pointer on the stack in the slot reserved for StubN. However, gcc doesn't copy any arguments to the stack as no arguments are declared for StubN. Even if it did, there's no guarantee that we could force gcc to save the argument on the stack as that's more expensive than copying to a free register. Thus, we need to copy %r26 to the stack slot manually. |
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