/* * Copyright (C) 2016-17 Synopsys, Inc. (www.synopsys.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef __SOC_ARC_TIMERS_H #define __SOC_ARC_TIMERS_H #include /* Timer related Aux registers */ #define ARC_REG_TIMER0_LIMIT 0x23 /* timer 0 limit */ #define ARC_REG_TIMER0_CTRL 0x22 /* timer 0 control */ #define ARC_REG_TIMER0_CNT 0x21 /* timer 0 count */ #define ARC_REG_TIMER1_LIMIT 0x102 /* timer 1 limit */ #define ARC_REG_TIMER1_CTRL 0x101 /* timer 1 control */ #define ARC_REG_TIMER1_CNT 0x100 /* timer 1 count */ /* CTRL reg bits */ #define TIMER_CTRL_IE (1 << 0) /* Interrupt when Count reaches limit */ #define TIMER_CTRL_NH (1 << 1) /* Count only when CPU NOT halted */ #define ARC_TIMERN_MAX 0xFFFFFFFF #define ARC_REG_TIMERS_BCR 0x75 struct bcr_timer { #ifdef CONFIG_CPU_BIG_ENDIAN unsigned int pad2:15, rtsc:1, pad1:5, rtc:1, t1:1, t0:1, ver:8; #else unsigned int ver:8, t0:1, t1:1, rtc:1, pad1:5, rtsc:1, pad2:15; #endif }; #endif t-loop-back'>packet-loop-back net-next plumbingsTobias Klauser
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authorMichael Ellerman <mpe@ellerman.id.au>2016-03-24 22:04:05 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2016-04-14 15:48:06 +1000
commit85baa095497f3e590df9f6c8932121f123efca5c (patch)
treee05e3f82a00772249694c361a77efb593ac5781c /kernel/livepatch
parent5d31a96e6c0187f2c5d7004e005fd094a1277e9e (diff)
powerpc/livepatch: Add live patching support on ppc64le
Add the kconfig logic & assembly support for handling live patched functions. This depends on DYNAMIC_FTRACE_WITH_REGS, which in turn depends on the new -mprofile-kernel ftrace ABI, which is only supported currently on ppc64le. Live patching is handled by a special ftrace handler. This means it runs from ftrace_caller(). The live patch handler modifies the NIP so as to redirect the return from ftrace_caller() to the new patched function. However there is one particularly tricky case we need to handle. If a function A calls another function B, and it is known at link time that they share the same TOC, then A will not save or restore its TOC, and will call the local entry point of B. When we live patch B, we replace it with a new function C, which may not have the same TOC as A. At live patch time it's too late to modify A to do the TOC save/restore, so the live patching code must interpose itself between A and C, and do the TOC save/restore that A omitted. An additionaly complication is that the livepatch code can not create a stack frame in order to save the TOC. That is because if C takes > 8 arguments, or is varargs, A will have written the arguments for C in A's stack frame. To solve this, we introduce a "livepatch stack" which grows upward from the base of the regular stack, and is used to store the TOC & LR when calling a live patched function. When the patched function returns, we retrieve the real LR & TOC from the livepatch stack, restore them, and pop the livepatch "stack frame". Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Reviewed-by: Torsten Duwe <duwe@suse.de> Reviewed-by: Balbir Singh <bsingharora@gmail.com>
Diffstat (limited to 'kernel/livepatch')