Re: [PATCH] RISC-V: Restore the typcast to 64bit type

[Andreas Schwab]

On Mär 28 2021, Khem Raj wrote:

> this makes the type promotions clear and explicit
> It was already typecasted to long but was accidentally dropped in [1]

Note that long is 32-bit on riscv32, so the title is misleading (there
was no cast to 64-bit type before).  The cast really was a no-op, as it
didn't change the resulting type.  The issue is that the types of
sym_addr, target_section_addr and offset are Elf_Addr (aka Elf32_Addr),
which is an unsigned type (image_target->vaddr_offset is signed, but not
wider than Elf32_Addr, so it doesn't change the overall type).  Thus
when the result of the expression is extended to grub_int64_t it is
always a positive value instead of the desired sign-extended one.

> which stated to cause failures on riscv32 as reported in [2]

Most likely the missing addend masked the error.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."