1/* SPDX-License-Identifier: GPL-2.0 */ 2/* Copyright (C) 2017 Andes Technology Corporation */ 3 4#include <linux/init.h> 5#include <linux/linkage.h> 6#include <asm/asm.h> 7#include <asm/csr.h> 8#include <asm/unistd.h> 9#include <asm/thread_info.h> 10#include <asm/asm-offsets.h> 11#include <asm-generic/export.h> 12#include <asm/ftrace.h> 13 14 .text 15 16 .macro SAVE_ABI_STATE 17#ifdef CONFIG_FUNCTION_GRAPH_TRACER 18 addi sp, sp, -48 19 sd s0, 32(sp) 20 sd ra, 40(sp) 21 addi s0, sp, 48 22 sd t0, 24(sp) 23 sd t1, 16(sp) 24#ifdef HAVE_FUNCTION_GRAPH_FP_TEST 25 sd t2, 8(sp) 26#endif 27#else 28 addi sp, sp, -16 29 sd s0, 0(sp) 30 sd ra, 8(sp) 31 addi s0, sp, 16 32#endif 33 .endm 34 35 .macro RESTORE_ABI_STATE 36#ifdef CONFIG_FUNCTION_GRAPH_TRACER 37 ld s0, 32(sp) 38 ld ra, 40(sp) 39 addi sp, sp, 48 40#else 41 ld ra, 8(sp) 42 ld s0, 0(sp) 43 addi sp, sp, 16 44#endif 45 .endm 46 47 .macro RESTORE_GRAPH_ARGS 48 ld a0, 24(sp) 49 ld a1, 16(sp) 50#ifdef HAVE_FUNCTION_GRAPH_FP_TEST 51 ld a2, 8(sp) 52#endif 53 .endm 54 55ENTRY(ftrace_graph_caller) 56 addi sp, sp, -16 57 sd s0, 0(sp) 58 sd ra, 8(sp) 59 addi s0, sp, 16 60ftrace_graph_call: 61 .global ftrace_graph_call 62 /* 63 * Calling ftrace_enable/disable_ftrace_graph_caller would overwrite the 64 * call below. Check ftrace_modify_all_code for details. 65 */ 66 call ftrace_stub 67 ld ra, 8(sp) 68 ld s0, 0(sp) 69 addi sp, sp, 16 70 ret 71ENDPROC(ftrace_graph_caller) 72 73ENTRY(ftrace_caller) 74 /* 75 * a0: the address in the caller when calling ftrace_caller 76 * a1: the caller's return address 77 * a2: the address of global variable function_trace_op 78 */ 79 ld a1, -8(s0) 80 addi a0, ra, -MCOUNT_INSN_SIZE 81 la t5, function_trace_op 82 ld a2, 0(t5) 83 84#ifdef CONFIG_FUNCTION_GRAPH_TRACER 85 /* 86 * the graph tracer (specifically, prepare_ftrace_return) needs these 87 * arguments but for now the function tracer occupies the regs, so we 88 * save them in temporary regs to recover later. 89 */ 90 addi t0, s0, -8 91 mv t1, a0 92#ifdef HAVE_FUNCTION_GRAPH_FP_TEST 93 ld t2, -16(s0) 94#endif 95#endif 96 97 SAVE_ABI_STATE 98ftrace_call: 99 .global ftrace_call 100 /* 101 * For the dynamic ftrace to work, here we should reserve at least 102 * 8 bytes for a functional auipc-jalr pair. The following call 103 * serves this purpose. 104 * 105 * Calling ftrace_update_ftrace_func would overwrite the nops below. 106 * Check ftrace_modify_all_code for details. 107 */ 108 call ftrace_stub 109 110#ifdef CONFIG_FUNCTION_GRAPH_TRACER 111 RESTORE_GRAPH_ARGS 112 call ftrace_graph_caller 113#endif 114 115 RESTORE_ABI_STATE 116 ret 117ENDPROC(ftrace_caller) 118 119#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS 120 .macro SAVE_ALL 121 addi sp, sp, -(PT_SIZE_ON_STACK+16) 122 sd s0, (PT_SIZE_ON_STACK)(sp) 123 sd ra, (PT_SIZE_ON_STACK+8)(sp) 124 addi s0, sp, (PT_SIZE_ON_STACK+16) 125 126 sd x1, PT_RA(sp) 127 sd x2, PT_SP(sp) 128 sd x3, PT_GP(sp) 129 sd x4, PT_TP(sp) 130 sd x5, PT_T0(sp) 131 sd x6, PT_T1(sp) 132 sd x7, PT_T2(sp) 133 sd x8, PT_S0(sp) 134 sd x9, PT_S1(sp) 135 sd x10, PT_A0(sp) 136 sd x11, PT_A1(sp) 137 sd x12, PT_A2(sp) 138 sd x13, PT_A3(sp) 139 sd x14, PT_A4(sp) 140 sd x15, PT_A5(sp) 141 sd x16, PT_A6(sp) 142 sd x17, PT_A7(sp) 143 sd x18, PT_S2(sp) 144 sd x19, PT_S3(sp) 145 sd x20, PT_S4(sp) 146 sd x21, PT_S5(sp) 147 sd x22, PT_S6(sp) 148 sd x23, PT_S7(sp) 149 sd x24, PT_S8(sp) 150 sd x25, PT_S9(sp) 151 sd x26, PT_S10(sp) 152 sd x27, PT_S11(sp) 153 sd x28, PT_T3(sp) 154 sd x29, PT_T4(sp) 155 sd x30, PT_T5(sp) 156 sd x31, PT_T6(sp) 157 .endm 158 159 .macro RESTORE_ALL 160 ld x1, PT_RA(sp) 161 ld x2, PT_SP(sp) 162 ld x3, PT_GP(sp) 163 ld x4, PT_TP(sp) 164 ld x5, PT_T0(sp) 165 ld x6, PT_T1(sp) 166 ld x7, PT_T2(sp) 167 ld x8, PT_S0(sp) 168 ld x9, PT_S1(sp) 169 ld x10, PT_A0(sp) 170 ld x11, PT_A1(sp) 171 ld x12, PT_A2(sp) 172 ld x13, PT_A3(sp) 173 ld x14, PT_A4(sp) 174 ld x15, PT_A5(sp) 175 ld x16, PT_A6(sp) 176 ld x17, PT_A7(sp) 177 ld x18, PT_S2(sp) 178 ld x19, PT_S3(sp) 179 ld x20, PT_S4(sp) 180 ld x21, PT_S5(sp) 181 ld x22, PT_S6(sp) 182 ld x23, PT_S7(sp) 183 ld x24, PT_S8(sp) 184 ld x25, PT_S9(sp) 185 ld x26, PT_S10(sp) 186 ld x27, PT_S11(sp) 187 ld x28, PT_T3(sp) 188 ld x29, PT_T4(sp) 189 ld x30, PT_T5(sp) 190 ld x31, PT_T6(sp) 191 192 ld s0, (PT_SIZE_ON_STACK)(sp) 193 ld ra, (PT_SIZE_ON_STACK+8)(sp) 194 addi sp, sp, (PT_SIZE_ON_STACK+16) 195 .endm 196 197 .macro RESTORE_GRAPH_REG_ARGS 198 ld a0, PT_T0(sp) 199 ld a1, PT_T1(sp) 200#ifdef HAVE_FUNCTION_GRAPH_FP_TEST 201 ld a2, PT_T2(sp) 202#endif 203 .endm 204 205/* 206 * Most of the contents are the same as ftrace_caller. 207 */ 208ENTRY(ftrace_regs_caller) 209 /* 210 * a3: the address of all registers in the stack 211 */ 212 ld a1, -8(s0) 213 addi a0, ra, -MCOUNT_INSN_SIZE 214 la t5, function_trace_op 215 ld a2, 0(t5) 216 addi a3, sp, -(PT_SIZE_ON_STACK+16) 217 218#ifdef CONFIG_FUNCTION_GRAPH_TRACER 219 addi t0, s0, -8 220 mv t1, a0 221#ifdef HAVE_FUNCTION_GRAPH_FP_TEST 222 ld t2, -16(s0) 223#endif 224#endif 225 SAVE_ALL 226 227ftrace_regs_call: 228 .global ftrace_regs_call 229 call ftrace_stub 230 231#ifdef CONFIG_FUNCTION_GRAPH_TRACER 232 RESTORE_GRAPH_REG_ARGS 233 call ftrace_graph_caller 234#endif 235 236 RESTORE_ALL 237 ret 238ENDPROC(ftrace_regs_caller) 239#endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ 240
