derek.holloway
7502bf64a4
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97 lines
2.4 KiB
ArmAsm
97 lines
2.4 KiB
ArmAsm
//===-- xray_trampoline_riscv_common.s --------------------------*- ASM -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of XRay, a dynamic runtime instrumentation system.
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//
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// This implements the trampolines code shared between riscv32 and riscv64.
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//
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//===----------------------------------------------------------------------===//
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#include "../builtins/assembly.h"
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.text
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.p2align 2
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.global ASM_SYMBOL(__xray_FunctionEntry)
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ASM_TYPE_FUNCTION(__xray_FunctionEntry)
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ASM_SYMBOL(__xray_FunctionEntry):
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CFI_STARTPROC
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SAVE_ARG_REGISTERS
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// Load the handler function pointer into a2
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la a2, ASM_SYMBOL(_ZN6__xray19XRayPatchedFunctionE)
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LOAD_XLEN a2, 0(a2)
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// Handler address will be null if it is not set
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beq a2, x0, 1f
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// If we reach here, we are tracing an event
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// a0 already contains function id
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// a1 = 0 means we are tracing an entry event
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li a1, 0
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jalr a2
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1:
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RESTORE_ARG_REGISTERS
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jr ra
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ASM_SIZE(__xray_FunctionEntry)
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CFI_ENDPROC
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.text
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.p2align 2
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.global ASM_SYMBOL(__xray_FunctionExit)
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ASM_TYPE_FUNCTION(__xray_FunctionExit)
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ASM_SYMBOL(__xray_FunctionExit):
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CFI_STARTPROC
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SAVE_RET_REGISTERS
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// Load the handler function pointer into a2
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la a2, ASM_SYMBOL(_ZN6__xray19XRayPatchedFunctionE)
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LOAD_XLEN a2, 0(a2)
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// Handler address will be null if it is not set
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beq a2, x0, 1f
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// If we reach here, we are tracing an event
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// a0 already contains function id
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// a1 = 1 means we are tracing an exit event
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li a1, 1
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jalr a2
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1:
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RESTORE_RET_REGISTERS
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jr ra
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ASM_SIZE(__xray_FunctionExit)
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CFI_ENDPROC
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.text
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.p2align 2
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.global ASM_SYMBOL(__xray_FunctionTailExit)
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ASM_TYPE_FUNCTION(__xray_FunctionTailExit)
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ASM_SYMBOL(__xray_FunctionTailExit):
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CFI_STARTPROC
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SAVE_ARG_REGISTERS
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// Load the handler function pointer into a2
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la a2, ASM_SYMBOL(_ZN6__xray19XRayPatchedFunctionE)
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LOAD_XLEN a2, 0(a2)
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// Handler address will be null if it is not set
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beq a2, x0, 1f
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// If we reach here, we are tracing an event
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// a0 already contains function id
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// a1 = 2 means we are tracing a tail exit event
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li a1, 2
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jalr a2
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1:
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RESTORE_ARG_REGISTERS
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jr ra
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ASM_SIZE(__xray_FunctionTailExit)
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CFI_ENDPROC
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