When compiled as PIE, executable can be loaded at any memory address.
Lately, OpenSBI switched to such behavior and spike was not able to load
it anymore. This patch add an additional load_offset parameter for
load_elf(). This load_offset value is passed as DRAM_BASE and used only
for ET_DYN elfs.
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Stricter validation of ELF binaries improves usability with informative
assertions. This prevents users from loading ELF relocatable files and
binaries compiled for their (non-RISC-V) workstations, for example.
Without this patch, spike would attempt to load nearly any ELF given,
but it would usually fail with an error about debug module accesses,
since the given ELF causes accesses in the debug module's memory space.
Even if spike successfully loaded the ELF file, it would still misbehave
during simulation, for example in the case of ELF relocatable files.
ELF magic numbers come from official ELF documents:
TIS ELF spec v1.2, via Linux Foundation Referenced Specifications
See: https://refspecs.linuxbase.org/
RISC-V magic number comes from official RISC-V ELF documents:
See: riscv/riscv-elf-psabi-doc@60c25981b62c0b43d16142f8a12c8b1e98e60d4d
Clément Léger
Marcus Comstedt
Andrew Waterman
Alexander Lent