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| author |   Rohan McLure <rmclure@linux.ibm.com> | 2022-09-21 16:55:49 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2022-09-26 23:00:15 +1000 |
| commit | 43d5de2b67d7f4a8478820005152f7f689608f2f (patch) | |
| tree | 59e20d406e0ea54971df234e371a4e0268b86765 /include/asm-generic | |
| parent | powerpc: Fix fallocate and fadvise64_64 compat parameter combination (diff) | |
| download | linux-dev-43d5de2b67d7f4a8478820005152f7f689608f2f.tar.xz linux-dev-43d5de2b67d7f4a8478820005152f7f689608f2f.zip | |
asm-generic: compat: Support BE for long long args in 32-bit ABIs
32-bit ABIs support passing 64-bit integers by registers via argument
translation. Commit 59c10c52f573 ("riscv: compat: syscall: Add
compat_sys_call_table implementation") implements the compat_arg_u64
macro for efficiently defining little endian compatibility syscalls.
Architectures supporting big endianness may benefit from reciprocal
argument translation, but are welcome also to implement their own.
Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@anrdb.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220921065605.1051927-10-rmclure@linux.ibm.com
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/compat.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/include/asm-generic/compat.h b/include/asm-generic/compat.h index d06308a2a7a8..aeb257ad3d1a 100644 --- a/include/asm-generic/compat.h +++ b/include/asm-generic/compat.h @@ -14,12 +14,17 @@ #define COMPAT_OFF_T_MAX 0x7fffffff #endif -#if !defined(compat_arg_u64) && !defined(CONFIG_CPU_BIG_ENDIAN) +#ifndef compat_arg_u64 +#ifdef CONFIG_CPU_BIG_ENDIAN #define compat_arg_u64(name) u32 name##_lo, u32 name##_hi #define compat_arg_u64_dual(name) u32, name##_lo, u32, name##_hi +#else +#define compat_arg_u64(name) u32 name##_hi, u32 name##_lo +#define compat_arg_u64_dual(name) u32, name##_hi, u32, name##_lo +#endif #define compat_arg_u64_glue(name) (((u64)name##_lo & 0xffffffffUL) | \ ((u64)name##_hi << 32)) -#endif +#endif /* compat_arg_u64 */ /* These types are common across all compat ABIs */ typedef u32 compat_size_t; |