1 | /* |
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2 | * systrap.S |
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3 | * |
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4 | * This file contains emulated system calls using software trap 0. |
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5 | * The following calls are supported: |
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6 | * |
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7 | * + SYS_exit (halt) |
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8 | * + SYS_irqdis (disable interrupts) |
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9 | * + SYS_irqset (set interrupt level) |
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10 | * |
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11 | * COPYRIGHT: |
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12 | * |
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13 | * COPYRIGHT (c) 1995. European Space Agency. |
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14 | * |
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15 | * This terms of the RTEMS license apply to this file. |
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16 | * |
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17 | */ |
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18 | |
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19 | #include <rtems/asm.h> |
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20 | #include "syscall.h" |
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21 | |
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22 | .section ".text" |
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23 | /* |
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24 | * system call - halt |
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25 | * |
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26 | * On entry: |
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27 | * |
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28 | * l0 = psr (from trap table) |
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29 | * l1 = pc |
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30 | * l2 = npc |
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31 | * g1 = system call id (1) |
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32 | * |
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33 | * System Call 1 (exit): |
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34 | * g2 = additional exit code 1 |
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35 | * g3 = additional exit code 2 |
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36 | */ |
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37 | |
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38 | PUBLIC(syscall) |
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39 | |
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40 | SYM(syscall): |
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41 | ta 0 ! syscall 1, halt with %g1,%g2,%g3 info |
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42 | |
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43 | PUBLIC(sparc_syscall_exit) |
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44 | |
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45 | SYM(sparc_syscall_exit): |
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46 | |
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47 | mov SYS_exit, %g1 |
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48 | mov %o0, %g2 ! Additional exit code 1 |
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49 | mov %o1, %g3 ! Additional exit code 2 |
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50 | ta SPARC_SWTRAP_SYSCALL |
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51 | |
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52 | /* |
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53 | * system call - Interrupt Disable |
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54 | * |
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55 | * On entry: |
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56 | * |
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57 | * l0 = psr (from trap table) |
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58 | * l1 = pc |
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59 | * l2 = npc |
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60 | * l3 = psr | SPARC_PSR_PIL_MASK |
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61 | * |
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62 | * On exit: |
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63 | * g1 = old psr (to user) |
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64 | */ |
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65 | |
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66 | .align 32 ! Align to 32-byte cache-line |
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67 | PUBLIC(syscall_irqdis) |
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68 | |
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69 | SYM(syscall_irqdis): |
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70 | mov %l3, %psr ! Set PSR. Write delay 3 instr |
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71 | or %l0, SPARC_PSR_ET_MASK, %g1 ! return old PSR with ET=1 |
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72 | nop ! PSR write delay |
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73 | jmp %l2 ! Return to after TA 9. |
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74 | rett %l2 + 4 |
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75 | |
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76 | /* |
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77 | * system call - Interrupt Enable |
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78 | * |
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79 | * On entry: |
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80 | * |
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81 | * l0 = psr (from trap table) |
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82 | * l1 = pc |
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83 | * l2 = npc |
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84 | * l3 = psr & ~0x0f00 |
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85 | * g1 = new PIL to write (from user) |
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86 | */ |
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87 | |
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88 | .align 32 ! Align to 32-byte cache-line |
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89 | PUBLIC(syscall_irqen) |
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90 | |
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91 | SYM(syscall_irqen): |
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92 | and %g1, SPARC_PSR_PIL_MASK, %l4 ! %l4 = (%g1 & 0xf00) |
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93 | wr %l3, %l4, %psr ! PSR = (PSR & ~0xf00) ^ %l4 |
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94 | nop; nop ! PSR write delay; |
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95 | jmp %l2 ! Return to after TA 10. |
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96 | rett %l2 + 4 |
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97 | |
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98 | #if SPARC_HAS_FPU == 1 |
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99 | /* |
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100 | * system call - Interrupt disable and set PSR[EF] according to caller |
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101 | * specified %g1 |
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102 | * |
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103 | * On entry: |
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104 | * |
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105 | * g1 = the desired PSR[EF] value (from caller) |
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106 | * l0 = psr (from trap table) |
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107 | * l1 = pc |
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108 | * l2 = npc |
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109 | * l3 = psr | SPARC_PSR_PIL_MASK |
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110 | * |
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111 | * On exit: |
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112 | * g1 = old psr (to user) |
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113 | */ |
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114 | |
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115 | .align 32 ! Align to 32-byte cache-line |
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116 | PUBLIC(syscall_irqdis_fp) |
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117 | |
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118 | SYM(syscall_irqdis_fp): |
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119 | /* |
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120 | * We cannot use an intermediate value for operations with the PSR[EF] |
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121 | * bit since they use a 13-bit sign extension and PSR[EF] is bit 12. |
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122 | */ |
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123 | sethi %hi(SPARC_PSR_EF_MASK), %l4 |
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124 | |
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125 | andn %l3, %l4, %l3 ! Clear PSR[EF] |
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126 | and %g1, %l4, %g1 ! Select PSR[EF] only from %g1 |
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127 | or %l3, %g1, %l3 ! Set PSR[EF] according to %g1 |
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128 | mov %l3, %psr ! Set PSR. Write delay 3 instr |
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129 | or %l0, SPARC_PSR_ET_MASK, %g1 ! return old PSR with ET=1 |
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130 | nop ! PSR write delay |
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131 | jmp %l2 ! Return to after TA 9. |
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132 | rett %l2 + 4 |
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133 | #endif |
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134 | |
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135 | #if defined(RTEMS_PARAVIRT) |
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136 | |
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137 | PUBLIC(_SPARC_Get_PSR) |
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138 | |
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139 | SYM(_SPARC_Get_PSR): |
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140 | |
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141 | retl |
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142 | rd %psr, %o0 |
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143 | |
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144 | PUBLIC(_SPARC_Set_PSR) |
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145 | |
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146 | SYM(_SPARC_Set_PSR): |
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147 | |
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148 | mov %o0, %psr |
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149 | nop |
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150 | nop |
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151 | nop |
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152 | retl |
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153 | nop |
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154 | |
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155 | PUBLIC(_SPARC_Get_TBR) |
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156 | |
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157 | SYM(_SPARC_Get_TBR): |
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158 | |
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159 | retl |
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160 | rd %tbr, %o0 |
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161 | |
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162 | PUBLIC(_SPARC_Set_TBR) |
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163 | |
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164 | SYM(_SPARC_Set_TBR): |
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165 | |
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166 | retl |
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167 | wr %o0, 0, %tbr |
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168 | |
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169 | #endif /* defined(RTEMS_PARAVIRT) */ |
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170 | |
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171 | /* end of file */ |
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