[Git][ghc/ghc][wip/T22012] rts/RtsSymbols: Add AArch64 outline atomic operations

Ben Gamari (@bgamari) gitlab at gitlab.haskell.org
Fri Jul 7 15:45:09 UTC 2023



Ben Gamari pushed to branch wip/T22012 at Glasgow Haskell Compiler / GHC


Commits:
f71188cc by Ben Gamari at 2023-07-07T11:44:56-04:00
rts/RtsSymbols: Add AArch64 outline atomic operations

Fixes #22012 by adding the symbols described in
https://github.com/llvm/llvm-project/blob/main/llvm/docs/Atomics.rst#libcalls-atomic.

Ultimately this would be better addressed by #22011, but this is a first
step in the right direction and fixes the immediate symptom.

Generated via:

```python
ops = []
ORDERINGS = [ 'relax', 'acq', 'rel', 'acq_rel' ]
for order in ORDERINGS:
    for n in [1,2,4,8]:
        for op in ['swp', 'ldadd', 'ldclr', 'ldeor', 'ldset']:
            ops.append(f'__aarch64_{op}{n}_{order}')

    for m in [1,2,4,8,16]:
        ops.append(f'__aarch64_cas{n}_{order}')

print('\n'.join(f'    SymE_NeedsProto({op}),' for op in sorted(ops)))
```

- - - - -


2 changed files:

- + rts/AArch64Symbols.h
- rts/RtsSymbols.c


Changes:

=====================================
rts/AArch64Symbols.h
=====================================
@@ -0,0 +1,101 @@
+#define RTS_AARCH64_SYMBOLS \
+    SymE_NeedsProto(__aarch64_cas8_acq) \
+    SymE_NeedsProto(__aarch64_cas8_acq) \
+    SymE_NeedsProto(__aarch64_cas8_acq) \
+    SymE_NeedsProto(__aarch64_cas8_acq) \
+    SymE_NeedsProto(__aarch64_cas8_acq) \
+    SymE_NeedsProto(__aarch64_cas8_acq_rel) \
+    SymE_NeedsProto(__aarch64_cas8_acq_rel) \
+    SymE_NeedsProto(__aarch64_cas8_acq_rel) \
+    SymE_NeedsProto(__aarch64_cas8_acq_rel) \
+    SymE_NeedsProto(__aarch64_cas8_acq_rel) \
+    SymE_NeedsProto(__aarch64_cas8_rel) \
+    SymE_NeedsProto(__aarch64_cas8_rel) \
+    SymE_NeedsProto(__aarch64_cas8_rel) \
+    SymE_NeedsProto(__aarch64_cas8_rel) \
+    SymE_NeedsProto(__aarch64_cas8_rel) \
+    SymE_NeedsProto(__aarch64_cas8_relax) \
+    SymE_NeedsProto(__aarch64_cas8_relax) \
+    SymE_NeedsProto(__aarch64_cas8_relax) \
+    SymE_NeedsProto(__aarch64_cas8_relax) \
+    SymE_NeedsProto(__aarch64_cas8_relax) \
+    SymE_NeedsProto(__aarch64_ldadd1_acq) \
+    SymE_NeedsProto(__aarch64_ldadd1_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldadd1_rel) \
+    SymE_NeedsProto(__aarch64_ldadd1_relax) \
+    SymE_NeedsProto(__aarch64_ldadd2_acq) \
+    SymE_NeedsProto(__aarch64_ldadd2_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldadd2_rel) \
+    SymE_NeedsProto(__aarch64_ldadd2_relax) \
+    SymE_NeedsProto(__aarch64_ldadd4_acq) \
+    SymE_NeedsProto(__aarch64_ldadd4_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldadd4_rel) \
+    SymE_NeedsProto(__aarch64_ldadd4_relax) \
+    SymE_NeedsProto(__aarch64_ldadd8_acq) \
+    SymE_NeedsProto(__aarch64_ldadd8_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldadd8_rel) \
+    SymE_NeedsProto(__aarch64_ldadd8_relax) \
+    SymE_NeedsProto(__aarch64_ldclr1_acq) \
+    SymE_NeedsProto(__aarch64_ldclr1_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldclr1_rel) \
+    SymE_NeedsProto(__aarch64_ldclr1_relax) \
+    SymE_NeedsProto(__aarch64_ldclr2_acq) \
+    SymE_NeedsProto(__aarch64_ldclr2_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldclr2_rel) \
+    SymE_NeedsProto(__aarch64_ldclr2_relax) \
+    SymE_NeedsProto(__aarch64_ldclr4_acq) \
+    SymE_NeedsProto(__aarch64_ldclr4_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldclr4_rel) \
+    SymE_NeedsProto(__aarch64_ldclr4_relax) \
+    SymE_NeedsProto(__aarch64_ldclr8_acq) \
+    SymE_NeedsProto(__aarch64_ldclr8_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldclr8_rel) \
+    SymE_NeedsProto(__aarch64_ldclr8_relax) \
+    SymE_NeedsProto(__aarch64_ldeor1_acq) \
+    SymE_NeedsProto(__aarch64_ldeor1_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldeor1_rel) \
+    SymE_NeedsProto(__aarch64_ldeor1_relax) \
+    SymE_NeedsProto(__aarch64_ldeor2_acq) \
+    SymE_NeedsProto(__aarch64_ldeor2_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldeor2_rel) \
+    SymE_NeedsProto(__aarch64_ldeor2_relax) \
+    SymE_NeedsProto(__aarch64_ldeor4_acq) \
+    SymE_NeedsProto(__aarch64_ldeor4_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldeor4_rel) \
+    SymE_NeedsProto(__aarch64_ldeor4_relax) \
+    SymE_NeedsProto(__aarch64_ldeor8_acq) \
+    SymE_NeedsProto(__aarch64_ldeor8_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldeor8_rel) \
+    SymE_NeedsProto(__aarch64_ldeor8_relax) \
+    SymE_NeedsProto(__aarch64_ldset1_acq) \
+    SymE_NeedsProto(__aarch64_ldset1_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldset1_rel) \
+    SymE_NeedsProto(__aarch64_ldset1_relax) \
+    SymE_NeedsProto(__aarch64_ldset2_acq) \
+    SymE_NeedsProto(__aarch64_ldset2_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldset2_rel) \
+    SymE_NeedsProto(__aarch64_ldset2_relax) \
+    SymE_NeedsProto(__aarch64_ldset4_acq) \
+    SymE_NeedsProto(__aarch64_ldset4_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldset4_rel) \
+    SymE_NeedsProto(__aarch64_ldset4_relax) \
+    SymE_NeedsProto(__aarch64_ldset8_acq) \
+    SymE_NeedsProto(__aarch64_ldset8_acq_rel) \
+    SymE_NeedsProto(__aarch64_ldset8_rel) \
+    SymE_NeedsProto(__aarch64_ldset8_relax) \
+    SymE_NeedsProto(__aarch64_swp1_acq) \
+    SymE_NeedsProto(__aarch64_swp1_acq_rel) \
+    SymE_NeedsProto(__aarch64_swp1_rel) \
+    SymE_NeedsProto(__aarch64_swp1_relax) \
+    SymE_NeedsProto(__aarch64_swp2_acq) \
+    SymE_NeedsProto(__aarch64_swp2_acq_rel) \
+    SymE_NeedsProto(__aarch64_swp2_rel) \
+    SymE_NeedsProto(__aarch64_swp2_relax) \
+    SymE_NeedsProto(__aarch64_swp4_acq) \
+    SymE_NeedsProto(__aarch64_swp4_acq_rel) \
+    SymE_NeedsProto(__aarch64_swp4_rel) \
+    SymE_NeedsProto(__aarch64_swp4_relax) \
+    SymE_NeedsProto(__aarch64_swp8_acq) \
+    SymE_NeedsProto(__aarch64_swp8_acq_rel) \
+    SymE_NeedsProto(__aarch64_swp8_rel) \
+    SymE_NeedsProto(__aarch64_swp8_relax)


=====================================
rts/RtsSymbols.c
=====================================
@@ -967,6 +967,13 @@ extern char **environ;
 #define RTS_LIBGCC_SYMBOLS
 #endif
 
+// Symbols defined by libgcc/compiler-rt for AArch64's outline atomics.
+#if defined(linux_HOST_OS) && defined(aarch64_HOST_ARCH)
+#include "AArch64Symbols.h"
+#else
+#define RTS_AARCH64_SYMBOLS
+#endif
+
 // Symbols defined by libc
 #define RTS_LIBC_SYMBOLS                               \
       SymI_HasProto_redirect(atexit, atexit, STRENGTH_STRONG, CODE_TYPE_CODE) /* See Note [Strong symbols] */ \
@@ -1014,6 +1021,7 @@ RTS_LIBC_SYMBOLS
 RTS_LIBGCC_SYMBOLS
 RTS_FINI_ARRAY_SYMBOLS
 RTS_LIBFFI_SYMBOLS
+RTS_AARCH64_SYMBOLS
 
 #undef SymI_NeedsProto
 #undef SymI_NeedsDataProto
@@ -1055,6 +1063,7 @@ RtsSymbolVal rtsSyms[] = {
       RTS_LIBGCC_SYMBOLS
       RTS_FINI_ARRAY_SYMBOLS
       RTS_LIBFFI_SYMBOLS
+      RTS_AARCH64_SYMBOLS
       SymI_HasDataProto(nonmoving_write_barrier_enabled)
 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
       // dyld stub code contains references to this,



View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f71188cc67eb95cd12f6d5a2dbe46aaa2193fe87

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f71188cc67eb95cd12f6d5a2dbe46aaa2193fe87
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