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Author SHA1 Message Date
Fangrui Song
6ab8927931 [RISCV] Support clang -fpatchable-function-entry && GNU function attribute 'patchable_function_entry' 
Similar to D72215 (AArch64) and D72220 (x86).

```
% clang -target riscv32 -march=rv64g -c -fpatchable-function-entry=2 a.c && llvm-objdump -dr a.o
...
0000000000000000 <main>:
       0: 13 00 00 00   nop
       4: 13 00 00 00   nop

% clang -target riscv32 -march=rv64gc -c -fpatchable-function-entry=2 a.c && llvm-objdump -dr a.o
...
00000002 <main>:
       2: 01 00         nop
       4: 01 00         nop
```

Recently the mainline kernel started to use -fpatchable-function-entry=8 for riscv (https://git.kernel.org/linus/afc76b8b80112189b6f11e67e19cf58301944814).

Differential Revision: https://reviews.llvm.org/D98610
 2021-03-16 10:02:35 -07:00
Fangrui Song
57a1c1be53 [Sema] Allow function attribute patchable_function_entry on aarch64_be 
Reviewed By: nickdesaulniers

Differential Revision: https://reviews.llvm.org/D79495
 2020-05-06 10:10:25 -07:00
Fangrui Song
a44c434b68 Support function attribute patchable_function_entry 
This feature is generic. Make it applicable for AArch64 and X86 because
the backend has only implemented NOP insertion for AArch64 and X86.

Reviewed By: nickdesaulniers, aaron.ballman

Differential Revision: https://reviews.llvm.org/D72221
 2020-01-10 09:57:34 -08:00