3a1bed82a6
runtime.stackBarrier is a strange function: it is only ever "called" by smashing its address into a LR slot on the stack. Calling it like this certainly does not adhere to the rule that r12 is set to the global entry point before calling it and the prologue instrutions that compute r2 from r12 in fact just corrupt r2, which is bad because the function that stackBarrier returns to probably uses r2 to access global data. Fortunately stackBarrier itself does not access any global data and so does not depend on the value of r2, meaning we can ignore the ABI rules and simply skip inserting the prologue instructions into this specific function. Fixes 64bit.go, append.go and fixedbugs/issue13169.go from "cd test; go run run.go -linkshared". Change-Id: I606864133a83935899398e2d42edd08a946aab24 Reviewed-on: https://go-review.googlesource.com/17281 Reviewed-by: Austin Clements <austin@google.com> |
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The Go Programming Language
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