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1 /****************************************************************************
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2 * *
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3 * GNAT COMPILER COMPONENTS *
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4 * *
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5 * S I G T R A M P *
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6 * *
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7 * Asm Implementation File *
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8 * *
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9 * Copyright (C) 2017-2018, Free Software Foundation, Inc. *
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10 * *
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11 * GNAT is free software; you can redistribute it and/or modify it under *
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12 * terms of the GNU General Public License as published by the Free Soft- *
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13 * ware Foundation; either version 3, or (at your option) any later ver- *
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14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
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15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
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16 * or FITNESS FOR A PARTICULAR PURPOSE. *
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17 * *
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18 * As a special exception under Section 7 of GPL version 3, you are granted *
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19 * additional permissions described in the GCC Runtime Library Exception, *
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20 * version 3.1, as published by the Free Software Foundation. *
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21 * *
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22 * In particular, you can freely distribute your programs built with the *
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23 * GNAT Pro compiler, including any required library run-time units, using *
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24 * any licensing terms of your choosing. See the AdaCore Software License *
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25 * for full details. *
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26 * *
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27 * GNAT was originally developed by the GNAT team at New York University. *
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28 * Extensive contributions were provided by Ada Core Technologies Inc. *
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29 * *
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30 ****************************************************************************/
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31
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32 /**********************************************
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33 * QNX version of the __gnat_sigtramp service *
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34 **********************************************/
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35
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36 #include <ucontext.h>
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37
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38 #include "sigtramp.h"
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39 /* See sigtramp.h for a general explanation of functionality. */
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40
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41 extern void __gnat_sigtramp_common
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42 (int signo, void *siginfo, void *sigcontext,
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43 __sigtramphandler_t * handler);
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44
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45 void __gnat_sigtramp (int signo, void *si, void *sc,
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46 __sigtramphandler_t * handler)
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47 __attribute__((optimize(2)));
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48
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49 void __gnat_sigtramp (int signo, void *si, void *ucontext,
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50 __sigtramphandler_t * handler)
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51 {
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52 struct sigcontext *mcontext = &((ucontext_t *) ucontext)->uc_mcontext;
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53
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54 __gnat_sigtramp_common (signo, si, mcontext, handler);
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55 }
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56
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57 /* asm string construction helpers. */
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58
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59 #define STR(TEXT) #TEXT
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60 /* stringify expanded TEXT, surrounding it with double quotes. */
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61
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62 #define S(E) STR(E)
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63 /* stringify E, which will resolve as text but may contain macros
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64 still to be expanded. */
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65
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66 /* asm (TEXT) outputs <tab>TEXT. These facilitate the output of
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67 multiline contents: */
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68 #define TAB(S) "\t" S
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69 #define CR(S) S "\n"
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70
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71 #undef TCR
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72 #define TCR(S) TAB(CR(S))
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73
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74 /* Trampoline body block
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75 --------------------- */
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76
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77 #define COMMON_CFI(REG) \
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78 ".cfi_offset " S(REGNO_##REG) "," S(REG_OFFSET_##REG)
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79
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80 #ifdef __x86_64__
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81 /*****************************************
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82 * x86-64 *
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83 *****************************************/
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84
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85 // CFI register numbers
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86 #define REGNO_RAX 0
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87 #define REGNO_RDX 1
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88 #define REGNO_RCX 2
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89 #define REGNO_RBX 3
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90 #define REGNO_RSI 4
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91 #define REGNO_RDI 5
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92 #define REGNO_RBP 6
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93 #define REGNO_RSP 7
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94 #define REGNO_R8 8
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95 #define REGNO_R9 9
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96 #define REGNO_R10 10
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97 #define REGNO_R11 11
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98 #define REGNO_R12 12
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99 #define REGNO_R13 13
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100 #define REGNO_R14 14
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101 #define REGNO_R15 15 /* Used as CFA */
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102 #define REGNO_RPC 16 /* aka %rip */
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103
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104 // Registers offset from the regset structure
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105 #define REG_OFFSET_RDI 0x00
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106 #define REG_OFFSET_RSI 0x08
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107 #define REG_OFFSET_RDX 0x10
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108 #define REG_OFFSET_R10 0x18
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109 #define REG_OFFSET_R8 0x20
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110 #define REG_OFFSET_R9 0x28
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111 #define REG_OFFSET_RAX 0x30
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112 #define REG_OFFSET_RBX 0x38
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113 #define REG_OFFSET_RBP 0x40
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114 #define REG_OFFSET_RCX 0x48
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115 #define REG_OFFSET_R11 0x50
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116 #define REG_OFFSET_R12 0x58
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117 #define REG_OFFSET_R13 0x60
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118 #define REG_OFFSET_R14 0x68
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119 #define REG_OFFSET_R15 0x70
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120 #define REG_OFFSET_RPC 0x78 /* RIP */
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121 #define REG_OFFSET_RSP 0x90
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122
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123 #define CFI_COMMON_REGS \
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124 CR("# CFI for common registers\n") \
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125 TCR(COMMON_CFI(RSP)) \
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126 TCR(COMMON_CFI(R15)) \
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127 TCR(COMMON_CFI(R14)) \
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128 TCR(COMMON_CFI(R13)) \
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129 TCR(COMMON_CFI(R12)) \
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130 TCR(COMMON_CFI(R11)) \
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131 TCR(COMMON_CFI(RCX)) \
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132 TCR(COMMON_CFI(RBP)) \
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133 TCR(COMMON_CFI(RBX)) \
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134 TCR(COMMON_CFI(RAX)) \
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135 TCR(COMMON_CFI(R9)) \
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136 TCR(COMMON_CFI(R8)) \
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137 TCR(COMMON_CFI(R10)) \
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138 TCR(COMMON_CFI(RSI)) \
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139 TCR(COMMON_CFI(RDI)) \
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140 TCR(COMMON_CFI(RDX)) \
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141 TCR(COMMON_CFI(RPC)) \
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142 TCR(".cfi_return_column " S(REGNO_RPC))
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143
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144 #define SIGTRAMP_BODY \
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145 TCR(".cfi_def_cfa 15, 0") \
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146 CFI_COMMON_REGS \
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147 CR("") \
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148 TCR("# Allocate frame and save the non-volatile") \
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149 TCR("# registers we're going to modify") \
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150 TCR("subq $8, %rsp") \
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151 TCR("# Setup CFA_REG = context, which we'll retrieve as our CFA value") \
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152 TCR("movq %rdx, %r15") \
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153 TCR("# Call the real handler. The signo, siginfo and sigcontext") \
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154 TCR("# arguments are the same as those we received") \
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155 TCR("call *%rcx") \
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156 TCR("# This part should never be executed") \
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157 TCR("addq $8, %rsp") \
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158 TCR("ret")
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159 #endif
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160
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161 #ifdef __aarch64__
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162 /*****************************************
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163 * Aarch64 *
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164 *****************************************/
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165
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166 /* CFA reg: any callee saved register will do */
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167 #define CFA_REG 19
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168
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169 /* General purpose registers */
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170 #define REG_OFFSET_GR(n) (n * 8)
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171 #define REGNO_GR(n) n
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172
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173 /* ELR value offset withing the mcontext registers list */
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174 #define REG_OFFSET_ELR (32 * 8)
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175 /* The register used to hold the PC value to restore. We need a scratch
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176 register. */
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177 #define REGNO_PC 9
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178
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179 #define CFI_DEF_CFA \
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180 TCR(".cfi_def_cfa " S(CFA_REG) ", 0")
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181
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182 /* This restores the callee-saved registers, the FP, the LR, and the SP.
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183 A scratch register is used as return column to indicate the new value
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184 for PC */
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185 #define CFI_COMMON_REGS \
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186 CR("# CFI for common registers\n") \
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187 TCR(COMMON_CFI(GR(18))) \
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188 TCR(COMMON_CFI(GR(19))) \
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189 TCR(COMMON_CFI(GR(20))) \
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190 TCR(COMMON_CFI(GR(21))) \
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191 TCR(COMMON_CFI(GR(22))) \
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192 TCR(COMMON_CFI(GR(23))) \
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193 TCR(COMMON_CFI(GR(24))) \
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194 TCR(COMMON_CFI(GR(25))) \
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195 TCR(COMMON_CFI(GR(26))) \
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196 TCR(COMMON_CFI(GR(27))) \
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197 TCR(COMMON_CFI(GR(28))) \
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198 TCR(COMMON_CFI(GR(29))) \
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199 TCR(COMMON_CFI(GR(30))) \
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200 TCR(COMMON_CFI(GR(31))) \
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201 TCR(".cfi_offset " S(REGNO_PC) "," S(REG_OFFSET_ELR)) \
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202 TCR(".cfi_return_column " S(REGNO_PC))
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203
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204 #define SIGTRAMP_BODY \
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205 CFI_DEF_CFA \
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206 CFI_COMMON_REGS \
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207 TCR("# Allocate the frame (16bytes aligned) and push FP and LR") \
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208 TCR("stp x29, x30, [sp, #-32]!") \
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209 TCR("add x29, sp, 0") \
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210 TCR("# Push register used to hold the CFA on stack") \
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211 TCR("str x" S(CFA_REG) ", [sp, 16]") \
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212 TCR("# Set the CFA: x2 value") \
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213 TCR("mov x" S(CFA_REG) ", x2") \
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214 TCR("# Call the handler") \
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215 TCR("blr x3") \
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216 TCR("# Release our frame and return (should never get here!).") \
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217 TCR("ldr x" S(CFA_REG) ", [sp, 16]") \
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218 TCR("ldp x29, x30, [sp], 32") \
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219 TCR("ret")
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220
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221 #endif /* AARCH64 */
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222
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223 /* Symbol definition block
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224 ----------------------- */
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225
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226 #if defined (__x86_64__) || defined (__aarch64__)
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227 #define FUNC_ALIGN TCR(".p2align 4,,15")
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228 #else
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229 #define FUNC_ALIGN
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230 #endif
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231
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232 #define SIGTRAMP_START(SYM) \
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233 CR("# " S(SYM) " cfi trampoline") \
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234 TCR(".type " S(SYM) ", @function") \
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235 CR("") \
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236 FUNC_ALIGN \
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237 CR(S(SYM) ":") \
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238 TCR(".cfi_startproc") \
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239 TCR(".cfi_signal_frame")
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240
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241 /* Symbol termination block
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242 ------------------------ */
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243
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244 #define SIGTRAMP_END(SYM) \
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245 CR(".cfi_endproc") \
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246 TCR(".size " S(SYM) ", .-" S(SYM))
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247
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248 /*----------------------------
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249 -- And now, the real code --
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250 ---------------------------- */
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251
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252 /* Text section start. The compiler isn't aware of that switch. */
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253
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254 asm (".text\n"
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255 TCR(".align 2"));
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256
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257 /* sigtramp stub for common registers. */
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258
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259 #define TRAMP_COMMON __gnat_sigtramp_common
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260
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261 asm (SIGTRAMP_START(TRAMP_COMMON));
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262 asm (SIGTRAMP_BODY);
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263 asm (SIGTRAMP_END(TRAMP_COMMON));
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