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162 Commits

Author SHA1 Message Date
Simon Atanasyan 9ab3b8db84 [Mips] Allocate local GOT entry for a global symbol defined in an 
executable file.

llvm-svn: 199517
 2014-01-17 21:18:45 +00:00
Simon Atanasyan 362bdc125e [Mips] Implement .plt and .got.plt section creation. 
llvm-svn: 199516
 2014-01-17 21:18:37 +00:00
Simon Atanasyan 66338224be [Mips] Handle R_MIPS_26 relocation. Maintaining of .plt and .got.plt 
sections will be implemented later.

llvm-svn: 199515
 2014-01-17 21:18:26 +00:00
Simon Atanasyan 80b86a43d5 [Mips] Provide default name of MIPS-specific interpreter. 
llvm-svn: 199514
 2014-01-17 21:18:14 +00:00
Simon Atanasyan db2e1f35d8 [Mips] Create and initialize _gp symbol. 
llvm-svn: 199239
 2014-01-14 18:19:52 +00:00
Simon Atanasyan 3b1a761374 [Mips] Check initialization of _gp_disp and _GLOBAL_OFFSET_TABLE_ 
symbols in case of executable file linking.

llvm-svn: 199238
 2014-01-14 18:19:42 +00:00
Simon Atanasyan acb301fab1 [Mips] Set default executable entry symbol name for MIPS targets. On 
MIPS the entry symbol name is '__start' instead of '_start'.

llvm-svn: 199235
 2014-01-14 18:19:19 +00:00
Simon Atanasyan 663aa62863 [Mips] Set default base address for MIPS executables to 0x400000. Assign 
the lowest segment address to the MIPS_BASE_ADDRESS dynamic tag.

llvm-svn: 199234
 2014-01-14 18:19:12 +00:00
Simon Atanasyan a0f5caac26 [Mips] Add test case to check R_MIPS_HI16 / R_MIPS_LO16 relocations 
agains _gp_disp symbol.

llvm-svn: 199232
 2014-01-14 18:18:56 +00:00
Simon Atanasyan 2a1ae098b3 [Mips] Move got16.test assembler source code to the test file and use 
llvm-mc for an object file generation.

llvm-svn: 199231
 2014-01-14 18:18:49 +00:00
Simon Atanasyan 073c2d2974 [Mips] GOT16 relocation against non-local symbol does not require a 
paired LO16 relocation.

llvm-svn: 198790
 2014-01-08 20:43:03 +00:00
Simon Atanasyan 9931f95bac Linking of shared libraries for MIPS little-endian 32-bit target. 
The following are the most significant peculiarities of MIPS target:
- MIPS ABI requires some special tags in the dynamic table.
- GOT consists of two parts local and global. The local part contains
  entries refer locally visible symbols. The global part contains entries
  refer global symbols.
- Entries in the .dynsym section which have corresponded entries in the
  GOT should be:
  * Emitted at the end of .dynsym section
  * Sorted accordingly to theirs GOT counterparts
- There are "paired" relocations. One or more R_MIPS_HI16 and R_MIPS_GOT16
  relocations should be followed by R_MIPS_LO16 relocation. To calculate
  result of R_MIPS_HI16 and R_MIPS_GOT16 relocations we need to combine
  addends from these relocations and paired R_MIPS_LO16 relocation.

The patch reviewed by Michael Spencer, Shankar Easwaran, Rui Ueyama.
http://llvm-reviews.chandlerc.com/D2156

llvm-svn: 197342
 2013-12-15 12:57:28 +00:00