test/MC/ARM/eh-directive-setfp.s

   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: }