51 lines
1.1 KiB
ArmAsm
51 lines
1.1 KiB
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2017 Andes Technology Corporation */
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <asm/asm.h>
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#include <asm/csr.h>
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#include <asm/unistd.h>
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#include <asm/thread_info.h>
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#include <asm/asm-offsets.h>
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#include <asm-generic/export.h>
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#include <asm/ftrace.h>
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.text
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.macro SAVE_ABI_STATE
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addi sp, sp, -16
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sd s0, 0(sp)
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sd ra, 8(sp)
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addi s0, sp, 16
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.endm
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.macro RESTORE_ABI_STATE
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ld ra, 8(sp)
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ld s0, 0(sp)
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addi sp, sp, 16
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.endm
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ENTRY(ftrace_caller)
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/*
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* a0: the address in the caller when calling ftrace_caller
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* a1: the caller's return address
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*/
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ld a1, -8(s0)
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addi a0, ra, -MCOUNT_INSN_SIZE
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SAVE_ABI_STATE
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ftrace_call:
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.global ftrace_call
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/*
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* For the dynamic ftrace to work, here we should reserve at least
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* 8 bytes for a functional auipc-jalr pair. The following call
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* serves this purpose.
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*
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* Calling ftrace_update_ftrace_func would overwrite the nops below.
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* Check ftrace_modify_all_code for details.
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*/
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call ftrace_stub
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RESTORE_ABI_STATE
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ret
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ENDPROC(ftrace_caller)
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