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| author | Konstantin Zhuravlyov <kzhuravl_dev@outlook.com> | 2016-06-14 17:20:29 +0000 |
|---|---|---|
| committer | Konstantin Zhuravlyov <kzhuravl_dev@outlook.com> | 2016-06-14 17:20:29 +0000 |
| commit | 242d986ef1a8cac29c4e45fe10932955bcf54213 (patch) | |
| tree | c39a9bbe659a9c20428931508dc52c71092f3e1b /docs/CodeGenerator.rst | |
| parent | 3fc85ab7c2744f985fa45291f065c197cc8dc4e9 (diff) | |
[docs] Update AMDGPU relocation information
- Added new notation for specifying relocation calculation
- Renamed:
- R_AMDGPU_32_LOW -> R_AMDGPU_ABS32_LO
- R_AMDGPU_32_HIGH -> R_AMDGPU_ABS32_HI
- R_AMDGPU_64 -> R_AMDGPU_ABS64
- Added:
- R_AMDGPU_REL32
- R_AMDGPU_REL64
- R_AMDGPU_ABS32
- Updated calculations for relative relocations
Differential Revision: http://reviews.llvm.org/D21215
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272684 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/CodeGenerator.rst')
| -rw-r--r-- | docs/CodeGenerator.rst | 27 |
1 files changed, 14 insertions, 13 deletions
diff --git a/docs/CodeGenerator.rst b/docs/CodeGenerator.rst index e8753b92643..777b87a4343 100644 --- a/docs/CodeGenerator.rst +++ b/docs/CodeGenerator.rst @@ -2672,25 +2672,26 @@ Supported relocatable fields are: byte alignment. These values use the same byte order as other word values in the AMD GPU architecture -Following notations are used for specifying relocation types +Following notations are used for specifying relocation calculations: * **A** --- Represents the addend used to compute the value of the relocatable field +* **P** --- Represents the place (section offset or address) of the storage unit + being relocated (computed using ``r_offset``) * **S** --- Represents the value of the symbol whose index resides in the relocation entry AMDGPU Backend generates *Elf64_Rela* relocation records with the following supported relocation types: - ==================== ===== ========== ============================ - Relocation type Value Field Calculation - ==================== ===== ========== ============================ - ``R_AMDGPU_NONE`` 0 ``none`` ``none`` - ``R_AMDGPU_32_LOW`` 1 ``word32`` (S + A) & 0xFFFFFFFF - ``R_AMDGPU_32_HIGH`` 2 ``word32`` ((S + A) >> 32) & 0xFFFFFFFF - ``R_AMDGPU_64`` 3 ``word64`` S + A - ``R_AMDGPU_32`` 4 ``word32`` S + A - ==================== ===== ========== ============================ - -Only R_AMDGPU_32_LOW and R_AMDGPU_32_HIGH can be handled by the -dynamic linker. The rest must be statically resolved. + ===================== ===== ========== ==================== + Relocation type Value Field Calculation + ===================== ===== ========== ==================== + ``R_AMDGPU_NONE`` 0 ``none`` ``none`` + ``R_AMDGPU_ABS32_LO`` 1 ``word32`` (S + A) & 0xFFFFFFFF + ``R_AMDGPU_ABS32_HI`` 2 ``word32`` (S + A) >> 32 + ``R_AMDGPU_ABS64`` 3 ``word64`` S + A + ``R_AMDGPU_REL32`` 4 ``word32`` S + A - P + ``R_AMDGPU_REL64`` 5 ``word64`` S + A - P + ``R_AMDGPU_ABS32`` 6 ``word32`` S + A + ===================== ===== ========== ==================== |