[PATCH v2 2/3] riscv/purgatory: do not link with string.o and its dependencies

[Conor Dooley]

On Wed, Jul 26, 2023 at 11:54:00AM +0200, Petr Tesarik wrote:
> From: Petr Tesarik <petr.tesarik.ext at huawei.com>
> 
> Linking with this object file makes kexec_file_load(2) fail because of
> multiple unknown relocation types:
> 
> - R_RISCV_ADD16, R_RISCV_SUB16: used by alternatives in strcmp()
> - R_RISCV_GOT_HI20: used to resolve _ctype in strcasecmp()
> 
> All this hassle is needed for one single call to memcmp() from
> verify_sha256_digest() to compare 32 bytes of SHA256 checksum.
> 
> Simply replace this memcmp() call with an explicit loop over those 32 bytes
> and remove the need to link with string.o and all the other object files
> that provide undefined symbols from that object file.
> 
> Fixes: 838b3e28488f ("RISC-V: Load purgatory in kexec_file")
> Signed-off-by: Petr Tesarik <petr.tesarik.ext at huawei.com>

This version keeps the automation happy,
Acked-by: Conor Dooley <conor.dooley at microchip.com>

Thanks,
Conor.
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