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lib: sbi: Fix sign-extension in sbi_misaligned_load_handler()

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The misaligned load emulation does not sign-extend values correctly
due to missing sign typecast in value passed to the SET_RD() macro.

A very easy way to reproduce this issue is to load 16-bit value
0xff1e from a byte aligned address using LH instruction on hardware
lacking misaligned load/store.

This patch fixes sbi_misaligned_load_handler() for above issue.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-12-19 17:39:57 +05:30
committed by Anup Patel
parent a029bd90c6
commit 7dcb1e1753
1 changed files with 1 additions and 1 deletions
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2
lib/sbi/sbi_misaligned_ldst.c
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@@ -128,7 +128,7 @@ int sbi_misaligned_load_handler(ulong addr, ulong tval2, ulong tinst,
}
if (!fp)
SET_RD(insn, regs, val.data_ulong << shift >> shift);
SET_RD(insn, regs, ((long)(val.data_ulong << shift)) >> shift);
#ifdef __riscv_flen
else if (len == 8)
SET_F64_RD(insn, regs, val.data_u64);