Michael Smith 35b2b24e62 Implement reserveAllocationSpace for SectionMemoryManager (#71968) ...

Implements `reserveAllocationSpace` and provides an option to enable
`needsToReserveAllocationSpace` for large-memory environments with
AArch64.

The [AArch64
ABI](https://github.com/ARM-software/abi-aa/blob/main/sysvabi64/sysvabi64.rst#7code-models)
has restrictions on the distance between TEXT and GOT sections as the
instructions to reference them are limited to 2 or 4GB. Allocating
sections in multiple blocks can result in distances greater than that on
systems with lots of memory. In those environments several projects
using SectionMemoryManager with MCJIT have run across assertion failures
for the R_AARCH64_ADR_PREL_PG_HI21 instruction as it attempts to address
across distances greater than 2GB (an int32).

Fixes #71963 by allocating all sections in a single contiguous memory
allocation, limiting the distance required for instruction offsets
similar to how pre-compiled binaries would be loaded into memory.

Co-authored-by: Lang Hames <lhames@gmail.com>

2025-12-18 13:19:45 +11:00

13 KiB

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