[lld] r337377 - [ELF] - Add a test case to check DW_EH_PE_absptr address encoding.

[George Rimar via llvm-commits]

Author: grimar
Date: Wed Jul 18 04:02:37 2018
New Revision: 337377

URL: http://llvm.org/viewvc/llvm-project?rev=337377&view=rev
Log:
[ELF] - Add a test case to check DW_EH_PE_absptr address encoding.

This covers the following line of the code:
https://github.com/llvm-mirror/lld/blob/master/ELF/SyntheticSections.cpp#L525

Added:
    lld/trunk/test/ELF/eh-frame-value-format8.s

Added: lld/trunk/test/ELF/eh-frame-value-format8.s
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/eh-frame-value-format8.s?rev=337377&view=auto
==============================================================================
--- lld/trunk/test/ELF/eh-frame-value-format8.s (added)
+++ lld/trunk/test/ELF/eh-frame-value-format8.s Wed Jul 18 04:02:37 2018
@@ -0,0 +1,74 @@
+# REQUIRES: x86
+
+# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
+# RUN: ld.lld --eh-frame-hdr --section-start .text=0x1000 %t.o -o %t
+# RUN: llvm-readobj -s -section-data %t | FileCheck %s
+
+## Check we are able to handle DW_EH_PE_absptr encoding.
+
+# CHECK:      Section {
+# CHECK:        Index:
+# CHECK:        Name: .eh_frame_hdr
+# CHECK-NEXT:   Type: SHT_PROGBITS
+# CHECK-NEXT:   Flags [
+# CHECK-NEXT:     SHF_ALLOC
+# CHECK-NEXT:   ]
+# CHECK-NEXT:   Address: 0x2000
+# CHECK-NEXT:   Offset: 0x2000
+# CHECK-NEXT:   Size: 20
+# CHECK-NEXT:   Link: 0
+# CHECK-NEXT:   Info: 0
+# CHECK-NEXT:   AddressAlignment: 4
+# CHECK-NEXT:   EntrySize: 0
+# CHECK-NEXT:   SectionData (
+# CHECK-NEXT:     0000: 011B033B 10000000 01000000 34F2FFFF
+# CHECK-NEXT:     0010: 24000000
+# Header (always 4 bytes): 011B033B
+#    10000000 = .eh_frame(0x2014) - .eh_frame_hdr(0x2000) - 4
+#    01000000 = 1 = the number of FDE pointers in the table.
+# 34F2FFFF = foo(0x1000) - 0x234(addend) - .eh_frame_hdr(0x2000)
+  
+# CHECK:      Section {
+# CHECK:        Index:
+# CHECK:        Name: .eh_frame
+# CHECK-NEXT:   Type: SHT_PROGBITS
+# CHECK-NEXT:   Flags [
+# CHECK-NEXT:     SHF_ALLOC
+# CHECK-NEXT:   ]
+# CHECK-NEXT:   Address: 0x2014
+# CHECK-NEXT:   Offset: 0x2014
+# CHECK-NEXT:   Size:
+# CHECK-NEXT:   Link:
+# CHECK-NEXT:   Info:
+# CHECK-NEXT:   AddressAlignment:
+# CHECK-NEXT:   EntrySize:
+# CHECK-NEXT:   SectionData (
+# CHECK-NEXT:     0000: 0C000000 00000000 01520001 010100FF
+# CHECK-NEXT:     0010: 0C000000 14000000 34120000 00000000
+#                                           ^
+#                                           ---> ADDR(foo) + 0x234 = 0x1234
+.text
+.global foo
+foo:
+ nop
+
+.section .eh_frame, "ax"
+  .long 12   # Size
+  .long 0x00 # ID
+  .byte 0x01 # Version.
+  
+  .byte 0x52 # Augmentation string: 'R','\0'
+  .byte 0x00
+  
+  .byte 0x01
+  
+  .byte 0x01 # LEB128
+  .byte 0x01 # LEB128
+
+  .byte 0x00 # DW_EH_PE_absptr
+
+  .byte 0xFF
+ 
+  .long 12  # Size
+  .long 0x14 # ID
+  .quad foo + 0x234