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3cdfcbfd32
The analyse_instr function currently doesn't just work out what an instruction does, it also executes those instructions whose effect is only to update CPU registers that are stored in struct pt_regs. This is undesirable because optprobes uses analyse_instr to work out if an instruction could be successfully emulated in future. This changes analyse_instr so it doesn't modify *regs; instead it stores information in the instruction_op structure to indicate what registers (GPRs, CR, XER, LR) would be set and what value they would be set to. A companion function called emulate_update_regs() can then use that information to update a pt_regs struct appropriately. As a minor cleanup, this replaces inline asm using the cntlzw and cntlzd instructions with calls to __builtin_clz() and __builtin_clzl(). Signed-off-by: Paul Mackerras <paulus@ozlabs.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.