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8a2857bc2b
Add a user_regset_view for Alpha and switch ELF core dumping to CORE_DUMP_USE_REGSET. General-purpose registers are exported in ELF gregs layout, including callee-saved registers and a correct user stack pointer. The user stack pointer is not preserved in pt_regs on Alpha, so expose it from the PCB, or via rdusp() for the current task, when building the ELF register image. This makes the user stack pointer consistent for core dumps, ptrace regsets, and PTRACE_GET_SYSCALL_INFO. Implement regset get/set callbacks for both NT_PRSTATUS and NT_PRFPREG. The callbacks translate between Alpha's pt_regs/thread state and the ELF-visible register layouts, while the common ptrace regset code handles PTRACE_GETREGSET and PTRACE_SETREGSET iovec semantics. This avoids duplicating subtle short-buffer and oversized-buffer behavior in arch_ptrace(). With these changes Alpha satisfies the requirements for HAVE_ARCH_TRACEHOOK and selects it, enabling generic tracehook and ptrace syscall-info code paths without changing the existing syscall entry ABI. Reviewed-by: Matt Turner <mattst88@gmail.com> Tested-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Magnus Lindholm <linmag7@gmail.com> Link: https://lore.kernel.org/r/20260706170019.2941459-2-linmag7@gmail.com Signed-off-by: Magnus Lindholm <linmag7@gmail.com>