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2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
131 lines
2.5 KiB
ArmAsm
131 lines
2.5 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Code to prepare detour buffer for optprobes in Kernel.
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*
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* Copyright 2017, Anju T, IBM Corp.
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*/
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#include <asm/ppc_asm.h>
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#include <asm/ptrace.h>
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#include <asm/asm-offsets.h>
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#define OPT_SLOT_SIZE 65536
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.balign 4
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/*
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* Reserve an area to allocate slots for detour buffer.
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* This is part of .text section (rather than vmalloc area)
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* as this needs to be within 32MB of the probed address.
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*/
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.global optinsn_slot
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optinsn_slot:
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.space OPT_SLOT_SIZE
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/*
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* Optprobe template:
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* This template gets copied into one of the slots in optinsn_slot
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* and gets fixed up with real optprobe structures et al.
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*/
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.global optprobe_template_entry
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optprobe_template_entry:
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/* Create an in-memory pt_regs */
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stdu r1,-INT_FRAME_SIZE(r1)
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SAVE_GPR(0,r1)
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/* Save the previous SP into stack */
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addi r0,r1,INT_FRAME_SIZE
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std r0,GPR1(r1)
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SAVE_10GPRS(2,r1)
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SAVE_10GPRS(12,r1)
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SAVE_10GPRS(22,r1)
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/* Save SPRS */
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mfmsr r5
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std r5,_MSR(r1)
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li r5,0x700
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std r5,_TRAP(r1)
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li r5,0
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std r5,ORIG_GPR3(r1)
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std r5,RESULT(r1)
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mfctr r5
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std r5,_CTR(r1)
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mflr r5
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std r5,_LINK(r1)
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mfspr r5,SPRN_XER
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std r5,_XER(r1)
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mfcr r5
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std r5,_CCR(r1)
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lbz r5,PACAIRQSOFTMASK(r13)
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std r5,SOFTE(r1)
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/*
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* We may get here from a module, so load the kernel TOC in r2.
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* The original TOC gets restored when pt_regs is restored
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* further below.
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*/
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ld r2,PACATOC(r13)
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.global optprobe_template_op_address
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optprobe_template_op_address:
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/*
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* Parameters to optimized_callback():
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* 1. optimized_kprobe structure in r3
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*/
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nop
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nop
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nop
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nop
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nop
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/* 2. pt_regs pointer in r4 */
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addi r4,r1,STACK_FRAME_OVERHEAD
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.global optprobe_template_call_handler
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optprobe_template_call_handler:
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/* Branch to optimized_callback() */
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nop
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/*
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* Parameters for instruction emulation:
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* 1. Pass SP in register r3.
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*/
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addi r3,r1,STACK_FRAME_OVERHEAD
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.global optprobe_template_insn
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optprobe_template_insn:
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/* 2, Pass instruction to be emulated in r4 */
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nop
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nop
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.global optprobe_template_call_emulate
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optprobe_template_call_emulate:
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/* Branch to emulate_step() */
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nop
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/*
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* All done.
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* Now, restore the registers...
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*/
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ld r5,_MSR(r1)
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mtmsr r5
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ld r5,_CTR(r1)
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mtctr r5
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ld r5,_LINK(r1)
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mtlr r5
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ld r5,_XER(r1)
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mtxer r5
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ld r5,_CCR(r1)
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mtcr r5
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REST_GPR(0,r1)
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REST_10GPRS(2,r1)
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REST_10GPRS(12,r1)
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REST_10GPRS(22,r1)
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/* Restore the previous SP */
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addi r1,r1,INT_FRAME_SIZE
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.global optprobe_template_ret
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optprobe_template_ret:
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/* ... and jump back from trampoline */
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nop
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.global optprobe_template_end
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optprobe_template_end:
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