931f7c6156
This patch introduces Position Independant Executable(PIE) support in TF-A. As a initial prototype, only BL31 can support PIE. A trivial dynamic linker is implemented which supports fixing up Global Offset Table(GOT) and Dynamic relocations(.rela.dyn). The fixup_gdt_reloc() helper function implements this linker and this needs to be called early in the boot sequence prior to invoking C functions. The GOT is placed in the RO section of BL31 binary for improved security and the BL31 linker script is modified to export the appropriate symbols required for the dynamic linker. The C compiler always generates PC relative addresses to linker symbols and hence referencing symbols exporting constants are a problem when relocating the binary. Hence the reference to the `__PERCPU_TIMESTAMP_SIZE__` symbol in PMF is removed and is now calculated at runtime based on start and end addresses. Change-Id: I1228583ff92cf432963b7cef052e95d995cca93d Signed-off-by: Soby Mathew <soby.mathew@arm.com> |
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| .. | ||
| aarch64 | ||
| bl31.ld.S | ||
| bl31.mk | ||
| bl31_context_mgmt.c | ||
| bl31_main.c | ||
| ehf.c | ||
| interrupt_mgmt.c | ||