Comments (2)
aswaterman
commented on July 24, 2024
It compensates for the fact that LO12_I and LO12_S are used with instructions that have 12-bit signed immediates--meaning that if bit 11 in the symbol address is set, those instructions will subtract 0x800 from the effective address, rather than adding 0x800 as we'd like. Adding 0x800 in the HI20 computation causes the lui or auipc instruction to add an extra 0x1000 in the cases where bit 11 is set, correcting for the delta between -0x800 and +0x800.
from riscv-elf-psabi-doc.
unicornx
commented on July 24, 2024
Got it, thanks.
from riscv-elf-psabi-doc.
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from riscv-elf-psabi-doc.