linux/arch/arm/kernel/kprobes-decode.c, branch master

ARM: kprobes: Rename kprobes-decode.c to kprobes-arm.c

2011-07-13T17:32:40Z

This file contains decoding and emulation functions for the ARM instruction set. As we will later be adding a file for Thumb and a file with common decoding functions, this renaming makes things clearer. Signed-off-by: Jon Medhurst Acked-by: Nicolas Pitre

ARM: kprobes: Tidy-up kprobes-decode.c

2011-04-29T03:41:01Z

- Remove coding standard violations reported by checkpatch.pl - Delete comment about handling of conditional branches which is no longer true. - Delete comment at end of file which lists all ARM instructions. This duplicates data available in the ARM ARM and seems like an unnecessary maintenance burden to keep this up to date and accurate. Signed-off-by: Jon Medhurst Signed-off-by: Nicolas Pitre

ARM: kprobes: Add emulation of hint instructions like NOP and WFI

2011-04-29T03:41:01Z

Being able to probe NOP instructions is useful for hard-coding probeable locations and is used by the kprobes test code. Signed-off-by: Jon Medhurst Signed-off-by: Nicolas Pitre

ARM: kprobes: Add emulation of SBFX, UBFX, BFI and BFC instructions

2011-04-29T03:41:00Z

These bit field manipulation instructions occur several thousand times in an ARMv7 kernel. Signed-off-by: Jon Medhurst Signed-off-by: Nicolas Pitre

ARM: kprobes: Add emulation of MOVW and MOVT instructions

2011-04-29T03:40:59Z

The MOVW and MOVT instructions account for approximately 7% of all instructions in a ARMv7 kernel as GCC uses them instead of a literal pool. Signed-off-by: Jon Medhurst Signed-off-by: Nicolas Pitre

ARM: kprobes: Reject probing of undefined data processing instructions

2011-04-29T03:40:59Z

The instruction decoding in space_cccc_000x needs to reject probing of instructions with undefined patterns as they may in future become defined and then emulated faultily - as has already happened with the SMC instruction. This fix is achieved by testing for the instruction patterns we want to probe and making the the default fall-through paths reject probes. This also allows us to remove some explicit tests for instructions that we wish to reject, as that is now the default action. Signed-off-by: Jon Medhurst Signed-off-by: Nicolas Pitre

ARM: kprobes: Remove redundant code in space_1111

2011-04-29T03:40:59Z

The tests to explicitly reject probing CPS, RFE and SRS instructions are redundant as the default case is now to reject undecoded patterns. Signed-off-by: Jon Medhurst Signed-off-by: Nicolas Pitre

ARM: kprobes: Fix emulation of PLD instructions

2011-04-29T03:40:59Z

The PLD instructions wasn't being decoded correctly and the emulation code wasn't adjusting PC correctly. As the PLD instruction is only a performance hint we emulate it as a simple nop, and we can broaden the instruction decoding to take into account newer PLI and PLDW instructions. Signed-off-by: Jon Medhurst Signed-off-by: Nicolas Pitre

ARM: kprobes: Reject probing of SETEND instructions

2011-04-29T03:40:59Z

The emulation of SETEND was broken as it changed the endianess for the running kprobes handling code. Rather than adding a new simulation routine to fix this we'll just reject probing of SETEND as these should be very rare in the kernel. Note, the function emulate_none is now unused but it is left in the source code as future patches will use it. Signed-off-by: Jon Medhurst Signed-off-by: Nicolas Pitre

ARM: kprobes: Consolidate stub decoding functions

2011-04-29T03:40:59Z

Following the change to remove support for coprocessor instructions we are left with three stub functions which can be consolidated. Signed-off-by: Jon Medhurst Signed-off-by: Nicolas Pitre