Support for go 1.6 (cgo argument has Go pointer to Go pointer) + stack corruption #11
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Signed-off-by: Tibor Vass <[email protected]>
In Go 1.6, arguments passed to C cannot be a Go pointer to memory containing Go pointers. When they do the following panic occurs: panic: runtime error: cgo argument has Go pointer to Go pointer Fix by converting argument to uintptr instead of unsafe.Pointer
Calling sum8 in TestStackArguments fails due to a bug in asm_amd64.S The function sum8 passes 8 arguments, where two of them are pushed on the stack before the function in the shared library is called. After the call instruction in asm_amd64.S returns, the stack must be restored to the previous state before the CPU registers are restored. Since the stack is not restored, invalid values are restored to the CPU registers, leading the incorrect results. Fix by restoring the stack pointer when arguments are passed on the stack.
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This PR adds two commits. One to fix the dreaded panic: runtime error: cgo argument has Go pointer to Go pointer, and one that fixes a bug in asm_amd64.S causing stack corruption.
The PR also includes the commit from tiborvass' PR