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95c326704e
Duplicate an address environment into freshly allocated pages mapped at the same virtual addresses, which is what POSIX fork() is built on. x86_64_fork_syscall() then lets the child run at the parent's stack addresses. A pointer to a stack local taken before fork() must name the same object in the child that it named in the parent, so the child adopts the parent's stack geometry rather than being given a relocated copy; the parent's stack is already in the duplicate, at the parent's address, with its contents. That shows up as a zero offset, which also means the copy would have the same source and destination, so both the copy and the frame-pointer relocation are skipped. Build-verified on qemu-intel64:knsh_romfs. NuttX on qemu-intel64 requires tsc-deadline and pcid, which TCG does not implement, so it cannot be run on this host. Assisted-by: Claude Code:claude-opus-5 Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com> |
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