diff options
Diffstat (limited to 'ports/sysdeps/arm/arm-features.h')
| -rw-r--r-- | ports/sysdeps/arm/arm-features.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/ports/sysdeps/arm/arm-features.h b/ports/sysdeps/arm/arm-features.h index 139a40368b..5104ba3329 100644 --- a/ports/sysdeps/arm/arm-features.h +++ b/ports/sysdeps/arm/arm-features.h @@ -40,4 +40,17 @@ that instructions using pc as a destination register must never be used, so a "bx" (or "blx") instruction is always required. */ +/* The log2 of the minimum alignment required for an address that + is the target of a computed branch (i.e. a "bx" instruction). + A more-specific arm-features.h file may define this to set a more + stringent requirement. + + Using this only makes sense for code in ARM mode (where instructions + always have a fixed size of four bytes), or for Thumb-mode code that is + specifically aligning all the related branch targets to match (since + Thumb instructions might be either two or four bytes). */ +#ifndef ARM_BX_ALIGN_LOG2 +# define ARM_BX_ALIGN_LOG2 2 +#endif + #endif /* arm-features.h */ |