commit c9dee84d81e4672dee5dd08890c904d1ab841e56
author Christopher Ferris <cferris@google.com> Fri Nov 03 14:50:27 2017 -0700
committer Christopher Ferris <cferris@google.com> Tue Nov 07 13:22:39 2017 -0800
tree b71dfd2d4adf1041b6420cef62492494d00e864c
parent 1e0b9672defa3504915741c8d4cec3cc73f89568

Add support for only a .eh_frame.

Static executables only have a .eh_frame section and no .eh_frame_hdr
section. Add support for this by rearranging the class hierarchy and
creating a DwarfEhFrameWithHdr class and a DwarfEhFrame class to handle
the different cases.

Add new unit tests for DwarfEhFrame and for the new functionality.

Bug: 68820189

Test: Passes new unit tests, unwinds static executables.
Change-Id: I63d7cb8c52a686e96579a2266e18c0d06bbb6e63

libunwindstack/tests/ElfInterfaceTest.cpp

diff --git a/libunwindstack/tests/ElfInterfaceTest.cpp b/libunwindstack/tests/ElfInterfaceTest.cpp
index 2752e99..e138c3a 100644
--- a/libunwindstack/tests/ElfInterfaceTest.cpp
+++ b/libunwindstack/tests/ElfInterfaceTest.cpp
@@ -910,8 +910,32 @@
   memory_.SetMemory(offset, &shdr, sizeof(shdr));
   offset += ehdr.e_shentsize;
 
+  memset(&shdr, 0, sizeof(shdr));
+  shdr.sh_type = SHT_PROGBITS;
+  shdr.sh_link = 2;
+  shdr.sh_name = 0x300;
+  shdr.sh_addr = 0x7000;
+  shdr.sh_offset = 0x7000;
+  shdr.sh_entsize = 0x100;
+  shdr.sh_size = 0x800;
+  memory_.SetMemory(offset, &shdr, sizeof(shdr));
+  offset += ehdr.e_shentsize;
+
+  memset(&shdr, 0, sizeof(shdr));
+  shdr.sh_type = SHT_PROGBITS;
+  shdr.sh_link = 2;
+  shdr.sh_name = 0x400;
+  shdr.sh_addr = 0x6000;
+  shdr.sh_offset = 0xa000;
+  shdr.sh_entsize = 0x100;
+  shdr.sh_size = 0xf00;
+  memory_.SetMemory(offset, &shdr, sizeof(shdr));
+  offset += ehdr.e_shentsize;
+
   memory_.SetMemory(0xf100, ".debug_frame", sizeof(".debug_frame"));
   memory_.SetMemory(0xf200, ".gnu_debugdata", sizeof(".gnu_debugdata"));
+  memory_.SetMemory(0xf300, ".eh_frame", sizeof(".eh_frame"));
+  memory_.SetMemory(0xf400, ".eh_frame_hdr", sizeof(".eh_frame_hdr"));
 
   uint64_t load_bias = 0;
   ASSERT_TRUE(elf->Init(&load_bias));
@@ -920,6 +944,10 @@
   EXPECT_EQ(0x500U, elf->debug_frame_size());
   EXPECT_EQ(0x5000U, elf->gnu_debugdata_offset());
   EXPECT_EQ(0x800U, elf->gnu_debugdata_size());
+  EXPECT_EQ(0x7000U, elf->eh_frame_offset());
+  EXPECT_EQ(0x800U, elf->eh_frame_size());
+  EXPECT_EQ(0xa000U, elf->eh_frame_hdr_offset());
+  EXPECT_EQ(0xf00U, elf->eh_frame_hdr_size());
 }
 
 TEST_F(ElfInterfaceTest, init_section_headers_offsets32) {