2023-08-30 17:31:07 +02:00
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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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#define FENTRY_RA_OFFSET 8
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#define ABI_SIZE_ON_STACK 80
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#define ABI_A0 0
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#define ABI_A1 8
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#define ABI_A2 16
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#define ABI_A3 24
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#define ABI_A4 32
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#define ABI_A5 40
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#define ABI_A6 48
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#define ABI_A7 56
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#define ABI_T0 64
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#define ABI_RA 72
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.macro SAVE_ABI
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addi sp, sp, -ABI_SIZE_ON_STACK
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REG_S a0, ABI_A0(sp)
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REG_S a1, ABI_A1(sp)
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REG_S a2, ABI_A2(sp)
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REG_S a3, ABI_A3(sp)
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REG_S a4, ABI_A4(sp)
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REG_S a5, ABI_A5(sp)
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REG_S a6, ABI_A6(sp)
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REG_S a7, ABI_A7(sp)
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REG_S t0, ABI_T0(sp)
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REG_S ra, ABI_RA(sp)
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.endm
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.macro RESTORE_ABI
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REG_L a0, ABI_A0(sp)
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REG_L a1, ABI_A1(sp)
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REG_L a2, ABI_A2(sp)
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REG_L a3, ABI_A3(sp)
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REG_L a4, ABI_A4(sp)
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REG_L a5, ABI_A5(sp)
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REG_L a6, ABI_A6(sp)
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REG_L a7, ABI_A7(sp)
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REG_L t0, ABI_T0(sp)
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REG_L ra, ABI_RA(sp)
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addi sp, sp, ABI_SIZE_ON_STACK
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.endm
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#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
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.macro SAVE_ALL
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addi sp, sp, -PT_SIZE_ON_STACK
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REG_S t0, PT_EPC(sp)
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REG_S x1, PT_RA(sp)
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REG_S x2, PT_SP(sp)
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REG_S x3, PT_GP(sp)
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REG_S x4, PT_TP(sp)
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REG_S x5, PT_T0(sp)
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2023-10-24 12:59:35 +02:00
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save_from_x6_to_x31
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2023-08-30 17:31:07 +02:00
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.endm
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.macro RESTORE_ALL
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REG_L x1, PT_RA(sp)
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REG_L x2, PT_SP(sp)
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REG_L x3, PT_GP(sp)
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REG_L x4, PT_TP(sp)
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2023-10-24 12:59:35 +02:00
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/* Restore t0 with PT_EPC */
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REG_L x5, PT_EPC(sp)
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restore_from_x6_to_x31
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2023-08-30 17:31:07 +02:00
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addi sp, sp, PT_SIZE_ON_STACK
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.endm
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#endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */
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ENTRY(ftrace_caller)
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SAVE_ABI
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addi a0, t0, -FENTRY_RA_OFFSET
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la a1, function_trace_op
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REG_L a2, 0(a1)
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mv a1, ra
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mv a3, sp
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ftrace_call:
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.global ftrace_call
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call ftrace_stub
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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addi a0, sp, ABI_RA
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REG_L a1, ABI_T0(sp)
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addi a1, a1, -FENTRY_RA_OFFSET
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#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
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mv a2, s0
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#endif
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ftrace_graph_call:
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.global ftrace_graph_call
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call ftrace_stub
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#endif
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RESTORE_ABI
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jr t0
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ENDPROC(ftrace_caller)
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#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
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ENTRY(ftrace_regs_caller)
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SAVE_ALL
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addi a0, t0, -FENTRY_RA_OFFSET
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la a1, function_trace_op
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REG_L a2, 0(a1)
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mv a1, ra
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mv a3, sp
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ftrace_regs_call:
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.global ftrace_regs_call
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call ftrace_stub
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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addi a0, sp, PT_RA
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REG_L a1, PT_EPC(sp)
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addi a1, a1, -FENTRY_RA_OFFSET
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#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
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mv a2, s0
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#endif
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ftrace_graph_regs_call:
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.global ftrace_graph_regs_call
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call ftrace_stub
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#endif
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RESTORE_ALL
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jr t0
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ENDPROC(ftrace_regs_caller)
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#endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */
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