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