1 @ RUN: llvm-mc %s -triple=armv7-unknown-linux-gnueabi -filetype=obj -o - \ 2 @ RUN: | llvm-readobj -s -sd | FileCheck %s 3 4 @ Check for .setfp directive. 5 6 @ The .setfp directive will track the offset between the frame pointer and 7 @ the stack pointer. This is required for the function that will change 8 @ the stack pointer out of the function prologue. If the exception is thrown, 9 @ then libunwind will reconstruct the stack pointer from the frame pointer. 10 @ The reconstruction code is implemented by two different unwind opcode: 11 @ (i) the unwind opcode to copy stack offset from the other register, and 12 @ (ii) the unwind opcode to add or subtract the stack offset. 13 @ 14 @ This file includes several cases separated by different range of -offset 15 @ 16 @ (-offset) < 0x00 17 @ (-offset) == 0x00 18 @ 0x04 <= (-offset) <= 0x100 19 @ 0x104 <= (-offset) <= 0x200 20 @ 0x204 <= (-offset) 21 22 23 .syntax unified 24 25 @------------------------------------------------------------------------------- 26 @ TEST1 27 @------------------------------------------------------------------------------- 28 .section .TEST1 29 .globl func1 30 .align 2 31 .type func1,%function 32 .fnstart 33 func1: 34 .setfp fp, sp, #0 35 add fp, sp, #0 36 sub sp, fp, #0 37 bx lr 38 .personality __gxx_personality_v0 39 .handlerdata 40 .fnend 41 42 @------------------------------------------------------------------------------- 43 @ The assembler should emit 0x9B to copy stack pointer from r11. 44 @------------------------------------------------------------------------------- 45 @ CHECK: Section { 46 @ CHECK: Name: .ARM.extab.TEST1 47 @ CHECK: SectionData ( 48 @ CHECK: 0000: 00000000 B0B09B00 |........| 49 @ CHECK: ) 50 @ CHECK: } 51 52 53 54 @------------------------------------------------------------------------------- 55 @ TEST2 56 @------------------------------------------------------------------------------- 57 .section .TEST2 58 .globl func2a 59 .align 2 60 .type func2a,%function 61 .fnstart 62 func2a: 63 .setfp fp, sp, #-4 64 add fp, sp, #4 65 sub sp, fp, #4 66 bx lr 67 .personality __gxx_personality_v0 68 .handlerdata 69 .fnend 70 71 .globl func2b 72 .align 2 73 .type func2b,%function 74 .fnstart 75 func2b: 76 .setfp fp, sp, #-0x100 77 add fp, sp, #0x100 78 sub sp, fp, #0x100 79 bx lr 80 .personality __gxx_personality_v0 81 .handlerdata 82 .fnend 83 84 @------------------------------------------------------------------------------- 85 @ The assembler should emit 0x9B to copy stack pointer from r11. 86 @ The assembler should emit ((-offset - 4) >> 2) for offset. 87 @------------------------------------------------------------------------------- 88 @ CHECK: Section { 89 @ CHECK: Name: .ARM.extab.TEST2 90 @ CHECK: SectionData ( 91 @ CHECK: 0000: 00000000 B0009B00 00000000 B03F9B00 |.............?..| 92 @ CHECK: ) 93 @ CHECK: } 94 95 96 97 @------------------------------------------------------------------------------- 98 @ TEST3 99 @------------------------------------------------------------------------------- 100 .section .TEST3 101 .globl func3a 102 .align 2 103 .type func3a,%function 104 .fnstart 105 func3a: 106 .setfp fp, sp, #-0x104 107 sub fp, sp, #0x104 108 add sp, fp, #0x104 109 bx lr 110 .personality __gxx_personality_v0 111 .handlerdata 112 .fnend 113 114 .globl func3b 115 .align 2 116 .type func3b,%function 117 .fnstart 118 func3b: 119 .setfp fp, sp, #-0x200 120 sub fp, sp, #0x200 121 add sp, fp, #0x200 122 bx lr 123 .personality __gxx_personality_v0 124 .handlerdata 125 .fnend 126 127 @------------------------------------------------------------------------------- 128 @ The assembler should emit 0x9B to copy stack pointer from r11. 129 @ The assembler should emit 0x3F and ((-offset - 0x104) >> 2) for offset. 130 @------------------------------------------------------------------------------- 131 @ CHECK: Section { 132 @ CHECK: Name: .ARM.extab.TEST3 133 @ CHECK: SectionData ( 134 @ CHECK: 0000: 00000000 3F009B00 00000000 3F3F9B00 |....?.......??..| 135 @ CHECK: ) 136 @ CHECK: } 137 138 139 140 @------------------------------------------------------------------------------- 141 @ TEST4 142 @------------------------------------------------------------------------------- 143 .section .TEST4 144 .globl func4a 145 .align 2 146 .type func4a,%function 147 .fnstart 148 func4a: 149 .setfp fp, sp, #-0x204 150 sub fp, sp, #0x204 151 add sp, fp, #0x204 152 bx lr 153 .personality __gxx_personality_v0 154 .handlerdata 155 .fnend 156 157 .globl func4b 158 .align 2 159 .type func4b,%function 160 .fnstart 161 func4b: 162 .setfp fp, sp, #-0x580 163 sub fp, sp, #0x580 164 add sp, fp, #0x580 165 bx lr 166 .personality __gxx_personality_v0 167 .handlerdata 168 .fnend 169 170 @------------------------------------------------------------------------------- 171 @ The assembler should emit 0x9B to copy stack pointer from r11. 172 @ The assembler should emit 0xB2 and the ULEB128 encoding of 173 @ ((-offset - 0x204) >> 2) for offset. 174 @------------------------------------------------------------------------------- 175 @ CHECK: Section { 176 @ CHECK: Name: .ARM.extab.TEST4 177 @ CHECK: SectionData ( 178 @ CHECK: 0000: 00000000 00B29B00 00000000 DFB29B01 |................| 179 @ CHECK: 0010: B0B0B001 |....| 180 @ CHECK: ) 181 @ CHECK: } 182 183 184 185 @------------------------------------------------------------------------------- 186 @ TEST5 187 @------------------------------------------------------------------------------- 188 .section .TEST5 189 .globl func5a 190 .align 2 191 .type func5a,%function 192 .fnstart 193 func5a: 194 .setfp fp, sp, #0x4 195 add fp, sp, #0x4 196 sub sp, fp, #0x4 197 bx lr 198 .personality __gxx_personality_v0 199 .handlerdata 200 .fnend 201 202 .globl func5b 203 .align 2 204 .type func5b,%function 205 .fnstart 206 func5b: 207 .setfp fp, sp, #0x104 208 add fp, sp, #0x104 209 sub sp, fp, #0x104 210 bx lr 211 .personality __gxx_personality_v0 212 .handlerdata 213 .fnend 214 215 .globl func5c 216 .align 2 217 .type func5c,%function 218 .fnstart 219 func5c: 220 .setfp fp, sp, #0x204 221 add fp, sp, #0x204 222 sub sp, fp, #0x204 223 bx lr 224 .personality __gxx_personality_v0 225 .handlerdata 226 .fnend 227 228 @------------------------------------------------------------------------------- 229 @ The assembler should emit 0x9B to copy stack pointer from r11. 230 @ The assembler should emit (0x40 | (offset - 4)) >> 2 for offset. 231 @ If (offset - 4) is greater than 0x3f, then multiple 0x7f should be emitted. 232 @------------------------------------------------------------------------------- 233 @ CHECK: Section { 234 @ CHECK: Name: .ARM.extab.TEST5 235 @ CHECK: SectionData ( 236 @ CHECK: 0000: 00000000 B0409B00 00000000 7F409B00 |.....@.......@..| 237 @ CHECK: 0010: 00000000 7F409B01 B0B0B07F |.....@......| 238 @ CHECK: ) 239 @ CHECK: } 240
